FOLDABLE ELECTRONIC DEVICE INCLUDING HINGE ASSEMBLY

Реферат: An electronic device including a hinge assembly is provided. The electronic device includes a first housing, a second housing, a hinge assembly coupling the first housing and the second housing so that the second housing is rotatable with respect to the first housing, and a flexible display disposed from one region of the first housing to at least one region of the second housing across the hinge assembly. The hinge assembly includes a first bracket coupled to at least one region of the first housing to rotate about a virtual first rotation axis, a second bracket coupled to at least one region of the second housing to rotate about a virtual second rotation axis, a fixing bracket supporting the first bracket and the second bracket, a first shaft rotating about a third rotation axis different from the virtual first rotation axis, a second shaft adjacent to the first shaft to rotate about a fourth rotation axis different from the virtual second rotation axis, a first arm portion coupled to the first shaft to rotate about the third rotation axis, and having one side coupled to at least one region of the first bracket, a second arm portion coupled to the second shaft to rotate about the fourth rotation axis, and having one side coupled to at least one region of the second bracket, and a support portion located between the first arm portion and the second arm portion. The support portion supports at least one region of the flexible display when the electronic device is in an unfolded state, and is spaced apart from the flexible display as the electronic device rotates from the unfolded state to a folded state.

Заявка: 1. An electronic device comprising:a first housing;a second housing;a hinge assembly coupling the first housing and the second housing so that the second housing is rotatable with respect to the first housing; anda flexible display disposed from one region of the first housing to at least one region of the second housing across the hinge assembly,wherein the hinge assembly comprises:a first bracket coupled to at least one region of the first housing to rotate about a first rotation axis;a second bracket coupled to at least one region of the second housing to rotate about a second rotation axis;a fixing bracket supporting the first bracket and the second bracket;a first shaft rotating about a third rotation axis different from the first rotation axis;a second shaft adjacent to the first shaft to rotate about a fourth rotation axis different from the second rotation axis;a first arm portion coupled to the first shaft to rotate about the third rotation axis, and having one side coupled to at least one region of the first bracket;a second arm portion coupled to the second shaft to rotate about the fourth rotation axis, and having one side coupled to at least one region of the second bracket; anda support portion located between the first arm portion and the second arm portion,wherein the support portion supports at least one region of the flexible display when the electronic device is in an unfolded state, and is spaced apart from the flexible display as the electronic device rotates from the unfolded state to a folded state.2. The electronic device of claim 1 , wherein the first arm portion comprises a first support rib supporting at least one region of the support portion when the electronic device is in the folded state claim 1 , andwherein the second arm portion comprises a second support rib supporting at least one region of the support portion when the electronic device is in the folded state.3. The electronic device of claim 2 , wherein the first support rib and the second support rib move the support portion in a direction of the flexible display claim 2 , as the electronic device rotates from the folded state to the unfolded state.4. The electronic device of claim 2 , further comprising:a first auxiliary member coupled to the first shaft to rotate about the third rotation axis, and comprising a third support rib; anda second auxiliary member coupled to the second shaft to rotate about the fourth rotation axis, and comprising a fourth support rib.5. The electronic device of claim 4 , wherein the third support rib and the fourth support rib move the support portion in a direction of the flexible display claim 4 , as the electronic device rotates from the folded state to the unfolded state.6. The electronic device of claim 3 , further comprising:a stopper having a through-hole through which a protrusion region of the support portion passes;a screw coupled to the protrusion region of the support portion; andan elastic member located between the stopper and the screw and in contact with at least one region of the stopper.7. The electronic device of claim 6 , wherein the elastic member is compressed claim 6 , as the electronic device rotates from the folded state to the unfolded state.8. The electronic device of claim 7 , wherein the support portion is spaced apart from the flexible display due to restoration force of the elastic member claim 7 , as the electronic device rotates from the unfolded state to the folded state.9. The electronic device of claim 3 , further comprising:a stopper located at a lower end of the support portion and having a groove constructed in at least one region; andan elastic member located inside the groove and having one side fixed to at least one region of the support portion and another side fixed to at least one region of the stopper.10. The electronic device of claim 9 , wherein the elastic member is elongated in a direction of the flexible display as the electronic device rotates from the folded state to the unfolded state.11. The electronic device of claim 6 , wherein the support portion further comprises a fixing rib constructed to protrude in a lower direction of the support portion.12. The electronic device of claim 11 , further comprising:a shaft bracket supporting the first shaft and the second shaft,wherein the fixing rib is in contact with one region of the stopper or one region of the shaft bracket as the electronic device rotates from the folded state to the unfolded state, so that the support portion is prevented from moving by more than a specified height.13. The electronic device of claim 1 , further comprising a detent plate comprising a detent portion of a concavo-convex structure constructed to protrude in a direction of the first arm portion and second arm portion.14. The electronic device of claim 13 , wherein a first cam portion corresponding to the detent portion is constructed in one region of the first arm portion claim 13 , andwherein a second cam portion corresponding to the detent portion is constructed in one region of the second arm portion.15. The electronic device of claim 1 , further comprising:a first gear coupled to the first shaft;a second gear coupled to the second shaft;a first idle gear engaged with the first gear; anda second idle gear engaged with the first idle gear and the second gear.16. The electronic device of claim 1 , wherein a first slide hole is constructed in one region of the first bracket corresponding to the first arm portion claim 1 ,wherein a second slide hole is constructed in one region of the second bracket corresponding to the second arm portion,wherein the first bracket and the first arm portion are coupled through a first fixing portion which passes through the first slide hole and one region of first arm portion, andwherein the second bracket and the second arm portion are coupled through a second fixing portion which passes through the second slide hole and one region of second arm portion.17. The electronic device of claim 16 , wherein the first fixing portion is slid from an outer region to inner region of the first slide hole claim 16 , as the electronic device rotates from the unfolded state to the folded state claim 16 , andwherein the second fixing portion is slid from the outer region to inner of the second slide hole as the electronic device rotates from the unfolded state to the folded state.18. A hinge assembly comprising:a hinge housing; andat least one hinge structure disposed inside the hinge housing,wherein the at least one hinge structure comprises:a first bracket rotating about a first rotation axis;a second bracket adjacent to the first bracket and rotating about a second rotation axis different from the first rotation axis;a fixing bracket supporting the first bracket and the second bracket;a first shaft rotating about a third rotation axis different from the first rotation axis, and having a first gear coupled thereto;a second shaft adjacent to the first shaft to rotate about a fourth rotation axis different from the second rotation axis, and having a second gear coupled thereto;a shaft bracket supporting the first shaft and the second shaft;a first idle gear gear-coupled with the first gear;a second idle gear gear-coupled with the first idle gear and the second gear;a first arm portion coupled to the first shaft to rotate about the third rotation axis, and having one side coupled to at least one region of the first bracket;a second arm portion coupled to the second shaft to rotate about the fourth rotation axis, and having one side coupled to at least one region of the second bracket; anda support portion moving up and down with the rotation of the first arm portion and second arm portion.19. The hinge assembly of claim 18 , wherein the first arm portion comprises a first support rib supporting at least one region of the support portion when the first arm portion and the second arm portion are in a horizontal state claim 18 , andwherein the second arm portion comprises a second support rib supporting at least one region of the support portion when the first arm portion and the second arm portion are in the horizontal state.20. The hinge assembly of claim 19 , further comprising:a stopper having a through-hole through which a protrusion region of the support portion passes;a screw coupled to the protrusion region of the support portion; andan elastic member located between the stopper and the screw and in contact with at least one region of the stopper.

Описание: This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2019-0158437, filed on Dec. 2, 2019, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety.The disclosure relates generally to a foldable electronic device including a hinge assembly.With the development of digital technologies, electronic devices are provided in various forms, such as a smart phone, a tablet personal computer (PC), or a personal digital assistant (PDA). The electronic device is also developed such that it is portable or worn by a user to improve portability and user accessibility.Recently, a portable electronic device such as a smart phone or a table PC, has been made lighter and thinner for ease of portability, and has been developed in various fields for convenience of use. In particular, despite that a foldable electronic device with a flexible display provides a relatively larger screen than a typical bar-type electronic device, portability can be improved since a size thereof is decreased when folded, thereby being satisfying consumers' preferences.A foldable electronic device may include a flexible display and a plurality of housings. The plurality of housings and the flexible display may be coupled in a state of being supported by a hinge assembly, and may rotate the housing within a specified range according to a user's manipulation. The electronic device may be switched from a folded state to an unfolded state or from the unfolded state to the folded state through a process of rotating the plurality of housings.There is a need to dispose various structures in order for the hinge assembly to rotate the housing. However, since a space to which the various structures can be disposed is narrow in a foldable electronic device with a narrow folding region, it may be difficult to dispose the various structures. Accordingly, there is a method that has been proposed to decrease a size of the hinge assembly by integrating the various structures. However, in the case of the aforementioned method, some regions of the flexible display may not be supported by the hinge assembly in a process in which the foldable electronic device is folded. Therefore, it is difficult to prevent some regions of the flexible display from being sagged or damaged.The present disclosure has been made to address the above-mentioned problems and disadvantages, and to provide at least the advantages described below.According to an aspect of the disclosure, an electronic device includes a first housing, a second housing, a hinge assembly coupling the first housing and the second housing so that the second housing is rotatable with respect to the first housing, and a flexible display disposed from one region of the first housing to at least one region of the second housing across the hinge assembly. The hinge assembly includes a first bracket coupled to at least one region of the first housing to rotate about a virtual first rotation axis, a second bracket coupled to at least one region of the second housing to rotate about a virtual second rotation axis, a fixing bracket supporting the first bracket and the second bracket, a first shaft rotating about a third rotation axis different from the virtual first rotation axis, a second shaft adjacent to the first shaft to rotate about a fourth rotation axis different from the virtual second rotation axis, a first arm portion coupled to the first shaft to rotate about the third rotation axis, and having one side coupled to at least one region of the first bracket, a second arm portion coupled to the second shaft to rotate about the fourth rotation axis, and having one side coupled to at least one region of the second bracket, and a support portion located between the first arm portion and the second arm portion. The support portion supports at least one region of the flexible display when the electronic device is in an unfolded state, and may be spaced apart from the flexible display as the electronic device rotates from the unfolded state to a folded state.According to another aspect of the disclosure, a hinge assembly includes a hinge housing, and at least one hinge structure disposed inside the hinge housing. The hinge structure includes a first bracket rotating about a virtual first rotation axis, a second bracket adjacent to the first bracket and rotating about a virtual second rotation axis different from the virtual first rotation axis, a fixing bracket supporting the first bracket and the second bracket, a first shaft rotating about a third rotation axis different from the virtual first rotation axis, and having a first gear coupled thereto, a second shaft adjacent to the first shaft to rotate about a fourth rotation axis different from the virtual second rotation axis, and having a second gear coupled thereto, a shaft bracket supporting the first shaft and the second shaft, a first idle gear gear-coupled with the first gear, a second idle gear gear-coupled with the first idle gear and the second gear, a first arm portion coupled to the first shaft to rotate about the third rotation axis, and having one side coupled to at least one region of the first bracket, a second arm portion coupled to the second shaft to rotate about the fourth rotation axis, and having one side coupled to at least one region of the second bracket, and a support portion moving up and down with the rotation of the first arm portion and second arm portion.Various embodiments of the disclosure provide an electronic device having a structure capable of supporting a flexible display even in a folding process to prevent some regions of the flexible display from being sagged or damaged in a process in which the foldable electronic device is folded.is a block diagram illustrating an electronic device in a network environment according to various embodiments. Referring to , the electronic device in the network environment may communicate with an electronic device via a first network (e.g., a short-range wireless communication network), or an electronic device or a server via a second network (e.g., a long-range wireless communication network). According to an embodiment, the electronic device may communicate with the electronic device via the server . According to an embodiment, the electronic device may include a processor , memory , an input device , a sound output device , a display device , an audio module , a sensor module , an interface , a haptic module , a camera module , a power management module , a battery , a communication module , a subscriber identification module (SIM) , or an antenna module . In some embodiments, at least one (e.g., the display device or the camera module ) of the components may be omitted from the electronic device , or one or more other components may be added in the electronic device . In some embodiments, some of the components may be implemented as single integrated circuitry. For example, the sensor module (e.g., a fingerprint sensor, an iris sensor, or an illuminance sensor) may be implemented as embedded in the display device (e.g., a display).The processor may execute, for example, software (e.g., a program ) to control at least one other component (e.g., a hardware or software component) of the electronic device coupled with the processor , and may perform various data processing or computation. According to one embodiment, as at least part of the data processing or computation, the processor may load a command or data received from another component (e.g., the sensor module or the communication module ) in volatile memory , process the command or the data stored in the volatile memory , and store resulting data in non-volatile memory . According to an embodiment, the processor may include a main processor (e.g., a central processing unit (CPU) or an application processor (AP)), and an auxiliary processor (e.g., a graphics processing unit (GPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)) that is operable independently from, or in conjunction with, the main processor . Additionally or alternatively, the auxiliary processor may be adapted to consume less power than the main processor , or to be specific to a specified function. The auxiliary processor may be implemented as separate from, or as part of the main processor .The auxiliary processor may control at least some of functions or states related to at least one component (e.g., the display device , the sensor module , or the communication module ) among the components of the electronic device , instead of the main processor while the main processor is in an inactive (e.g., sleep) state, or together with the main processor while the main processor is in an active state (e.g., executing an application). According to an embodiment, the auxiliary processor (e.g., an ISP or a CP) may be implemented as part of another component (e.g., the camera module or the communication module ) functionally related to the auxiliary processor .The memory may store various data used by at least one component (e.g., the processor or the sensor module ) of the electronic device . The various data may include, for example, software (e.g., the program ) and input data or output data for a command related thereto. The memory may include the volatile memory or the non-volatile memory .The program may be stored in the memory as software, and may include, for example, an operating system (OS) , middleware , or an application .The input device may receive a command or data to be used by another component (e.g., the processor ) of the electronic device , from the outside (e.g., a user) of the electronic device . The input device may include, for example, a microphone, a mouse, a keyboard, or a digital pen (e.g., a stylus pen).The sound output device may output sound signals to the outside of the electronic device . The sound output device may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as playing multimedia or playing a record, and the receiver may be used for an incoming call. According to an embodiment, the receiver may be implemented as separate from, or as part of the speaker.The display device may visually provide information to the outside (e.g., a user) of the electronic device . The display device may include, for example, a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, hologram device, and projector. According to an embodiment, the display device may include touch circuitry adapted to detect a touch, or sensor circuitry (e.g., a pressure sensor) adapted to measure the intensity of force incurred by the touch.The audio module may convert a sound into an electrical signal and vice versa. According to an embodiment, the audio module may obtain the sound via the input device , or output the sound via the sound output device or a headphone of an external electronic device (e.g., an electronic device ) directly (e.g., wiredly) or wirelessly coupled with the electronic device .The sensor module may detect an operational state (e.g., power or temperature) of the electronic device or an environmental state (e.g., a state of a user) external to the electronic device , and then generate an electrical signal or data value corresponding to the detected state. According to an embodiment, the sensor module may include, for example, a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.The interface may support one or more specified protocols to be used for the electronic device to be coupled with the external electronic device (e.g., the electronic device ) directly (e.g., wiredly) or wirelessly. According to an embodiment, the interface may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface.A connecting terminal may include a connector via which the electronic device may be physically connected with the external electronic device (e.g., the electronic device ). According to an embodiment, the connecting terminal may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).The haptic module may convert an electrical signal into a mechanical stimulus (e.g., a vibration or a movement) or electrical stimulus which may be recognized by a user via his tactile sensation or kinesthetic sensation. According to an embodiment, the haptic module may include, for example, a motor, a piezoelectric element, or an electric stimulator.The camera module may capture a still image or moving images. According to an embodiment, the camera module may include one or more lenses, image sensors, ISP, or flashes.The power management module may manage power supplied to the electronic device . According to one embodiment, the power management module may be implemented as at least part of, for example, a power management integrated circuit (PMIC).The battery may supply power to at least one component of the electronic device . According to an embodiment, the battery may include, for example, a primary cell which is not rechargeable, a secondary cell which is rechargeable, or a fuel cell.The communication module may support establishing a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device and the external electronic device (e.g., the electronic device , the electronic device , or the server ) and performing communication via the established communication channel. The communication module may include one or more CPs that are operable independently from the processor (e.g., the AP) and supports a direct (e.g., wired) communication or a wireless communication. According to an embodiment, the communication module may include a wireless communication module (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module (e.g., a local area network (LAN) communication module or a power line communication (PLC) module). A corresponding one of these communication modules may communicate with the external electronic device via the first network (e.g., a short-range communication network, such as Bluetooth™, wireless-fidelity (Wi-Fi) direct, or Infrared Data Association (IrDA)) or the second network (e.g., a long-range communication network, such as a cellular network, the Internet, or a computer network (e.g., LAN or wide area network (WAN)). These various types of communication modules may be implemented as a single component (e.g., a single chip), or may be implemented as multi components (e.g., multi chips) separate from each other. The wireless communication module may identify and authenticate the electronic device in a communication network, such as the first network or the second network , using subscriber information (e.g., international mobile subscriber identity (IMSI)) stored in the subscriber identification module .The antenna module may transmit or receive a signal or power to or from the outside (e.g., the external electronic device) of the electronic device . According to an embodiment, the antenna module may include an antenna including a radiating element composed of a conductive material or a conductive pattern formed in or on a substrate (e.g., PCB). According to an embodiment, the antenna module may include a plurality of antennas. In such a case, at least one antenna appropriate for a communication scheme used in the communication network, such as the first network or the second network , may be selected, for example, by the communication module (e.g., the wireless communication module ) from the plurality of antennas. The signal or the power may then be transmitted or received between the communication module and the external electronic device via the selected at least one antenna. According to an embodiment, another component (e.g., a radio frequency integrated circuit (RFIC)) other than the radiating element may be additionally formed as part of the antenna module .At least some of the above-described components may be coupled mutually and communicate signals (e.g., commands or data) therebetween via an inter-peripheral communication scheme (e.g., a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)).According to an embodiment, commands or data may be transmitted or received between the electronic device and the external electronic device via the server coupled with the second network . Each of the electronic devices and may be a device of a same type as, or a different type, from the electronic device . According to an embodiment, all or some of the operations to be executed at the electronic device may be executed at one or more of the external electronic devices , , or . For example, if the electronic device should perform a function or a service automatically, or in response to a request from a user or another device, the electronic device , instead of, or in addition to, executing the function or the service, may request the one or more external electronic devices to perform at least part of the function or the service. The one or more external electronic devices receiving the request may perform the at least part of the function or the service requested, or an additional function or an additional service related to the request, and transfer an outcome of the performing to the electronic device . The electronic device may provide the outcome, with or without further processing of the outcome, as at least part of a reply to the request. To that end, a cloud computing, distributed computing, or client-server computing technology may be used, for example.The electronic device according to various embodiments may be one of various types of electronic devices. The electronic devices may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. According to an embodiment of the disclosure, the electronic devices are not limited to those described above.It should be appreciated that various embodiments of the present disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It is to be understood that a singular form of a noun corresponding to an item may include one or more of the things, unless the relevant context clearly indicates otherwise. As used herein, each of such phrases as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C,” may include any one of, or all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “1st” and “2nd,” or “first” and “second” may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). It is to be understood that if an element (e.g., a first element) is referred to, with or without the term “operatively” or “communicatively”, as “coupled with,” “coupled to,” “connected with,” or “connected to” another element (e.g., a second element), it means that the element may be coupled with the other element directly (e.g., wiredly), wirelessly, or via a third element.As used herein, the term “module” may include a unit implemented in hardware, software, or firmware, and may interchangeably be used with other terms, for example, “logic,” “logic block,” “part,” or “circuitry”. A module may be a single integral component, or a minimum unit or part thereof, adapted to perform one or more functions. For example, according to an embodiment, the module may be implemented in a form of an application-specific integrated circuit (ASIC).Various embodiments as set forth herein may be implemented as software (e.g., the program ) including one or more instructions that are stored in a storage medium (e.g., internal memory or external memory ) that is readable by a machine (e.g., the electronic device ). For example, a processor (e.g., the processor ) of the machine (e.g., the electronic device ) may invoke at least one of the one or more instructions stored in the storage medium, and execute it, with or without using one or more other components under the control of the processor. This allows the machine to be operated to perform at least one function according to the at least one instruction invoked. The one or more instructions may include a code generated by a complier or a code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Wherein, the term “non-transitory” simply means that the storage medium is a tangible device, and does not include a signal (e.g., an electromagnetic wave), but this term does not differentiate between where data is semi-permanently stored in the storage medium and where the data is temporarily stored in the storage medium.A method according to various embodiments of the disclosure may be included and provided in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or be distributed (e.g., downloaded or uploaded) online via an application store (e.g., PlayStore™), or between two user devices (e.g., smart phones) directly. If distributed online, at least part of the computer program product may be temporarily generated or at least temporarily stored in the machine-readable storage medium, such as memory of the manufacturer's server, a server of the application store, or a relay server.According to various embodiments, each component (e.g., a module or a program) of the above-described components may include a single entity or multiple entities. According to various embodiments, one or more of the above-described components may be omitted, or one or more other components may be added. Alternatively or additionally, a plurality of components (e.g., modules or programs) may be integrated into a single component. In such a case, according to various embodiments, the integrated component may still perform one or more functions of each of the plurality of components in the same or similar manner as they are performed by a corresponding one of the plurality of components before the integration. According to various embodiments, operations performed by the module, the program, or another component may be carried out sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order or omitted, or one or more other operations may be added.is an exploded view of an electronic device in an unfolded state, according to an embodiment, and illustrates a folded state of the electronic device , according to an embodiment.Referring to and , the electronic device includes a foldable housing (a “housing”) including a first housing and a second housing , a flexible display , a hinge assembly , and a cover (a “rear cover”).The first housing and the second housing may form a space in which electronic components (e.g., a PCB, a battery, or a processor) of the electronic device can be disposed, and may form a side face of the electronic device . Various types of components for performing various functions of the electronic device may be disposed inside the first housing and the second housing . For example, electronic components such as a front camera, a receiver, or a sensor (e.g., a proximity sensor) may be disposed inside the first housing and the second housing . The aforementioned electronic components may be exposed to a front face of the electronic device through at least one opening or recess prepared on the flexible display .The first housing and the second housing may be disposed in parallel to each other when the electronic device is in an unfolded state. When the electronic device is in the folded state, the first housing may rotate (or turn) with respect to the second housing , so that one face of the first housing faces one face of the second housing .The first housing and the second housing may construct a recess for accommodating the flexible display , and the flexible display may be supported by the first housing and the second housing by being mounted to the recess. The flexible display may be supported by a first support plate and/or a second support plate located between the flexible display and first housing and the second housing , and details thereof will be described below. The first housing and the second housing may be constructed of a metal material and/or non-metal material having a specified rigidity to support the flexible display .The flexible display may be disposed on the first housing and the second housing to construct a front face (e.g., a face in the +y direction of ) of the electronic device when the electronic device is in the unfolded state. That is, the flexible display may be disposed by extending up to at least one region of the second housing across the hinge assembly from one region of the first housing . The flexible display may be disposed on the first housing and the second housing by being mounted to the recess constructed by the first housing and the second housing .The flexible display may include a first region corresponding to at least one region of the first housing , a second region corresponding to at least one region of the second housing , and a folding region located between the first region and the second region and having a flexible characteristic.The first region , the second region , and the folding region of the flexible display may also be constructed to have the flexible characteristic. The first region , the folding region , and the second region may be disposed in parallel to face the same direction (e.g., the +y direction of ), when the electronic device is in the unfolded state. Alternatively, when the electronic device is in the folded state, the folding region may be bent such that the first region and the second region are disposed to face each other.At least one of the first region or the second region of the flexible display may be attached to a face of the first housing and a face of the second housing . The flexible display may be attached to a face of the first housing and a face of the second housing through the support plates and located between the flexible display and the first housing and second housing .The support plates and may include the first support plate attached to at least one region of the first housing to support the first region of the flexible display and the second support plate attached to at least one region of the second housing to support the second region of the flexible display . The first support plate may be attached to at least one portion of the first region of the flexible display to support the flexible display . Similarly, the second support plate may be attached to at least one portion of the second region of the flexible display to support the flexible display . The first support plate and the second support plate may be constructed of a material having a rigidity to support the flexible display .The hinge assembly may couple the first housing and the second housing , and may rotate the second housing about the first housing within a specified rotation range, or on the contrary, may rotate the first housing about the second housing within a specified rotation range.A recess may be constructed in a region where the first housing and the second housing are coupled, so that the hinge assembly is disposed between the first housing and the second housing . The aforementioned recess may be constructed in a shape of a groove having a specific coverture.The hinge assembly includes a hinge housing . The hinge housing may be visible to the outside of the electronic device according to a state of the electronic device , or may be hidden by the foldable housing .As shown in , when the electronic device is in the unfolded state, the hinge housing is hidden by the folding housing , and thus may be invisible to the outside of the electronic device .As shown in , when the electronic device is in the folded state, the hinge housing may be visible to the outside of the electronic device due to a rotation of the first housing and second housing .The cover may be located at a lower end (e.g., the −y direction of ) of the first housing and second housing to construct a rear face of the electronic device . The cover may include a first cover coupled to the first housing and a second cover coupled to the second housing . The first cover and the first housing may be constructed integrally, and the second cover and the second housing may also be constructed integrally.illustrates a hinge assembly of an electronic device, according to an embodiment.Referring to , an electronic device includes the hinge assembly . The hinge assembly includes a hinge housing and at least one or more hinge structures and disposed on the hinge housingThe hinge housing may include a groove (or a recess) to which the at least one or more hinge structures and can be disposed. The at least one or more hinge structures and may be disposed inside the groove of the hinge assembly , and the at least one or more hinge structures and may be supported by the hinge housingThe hinge assembly may include the first hinge structure disposed to one region (e.g., a left region of ) of the hinge housing and the second hinge structure disposed to another region (e.g., a right region of ) of the hinge housing . The first hinge structure may be disposed to the left region of the hinge housing , and thus may be coupled (or connected) to one region of a first housing and second housing . The second hinge structure may be disposed to the right region of the hinge housing , and thus may be coupled (or connected) to the first housing and the second housing. The first hinge structure and the second hinge structure may rotate within a specified angle range about a virtual first rotation axis L constructed in the hinge housing and a virtual second rotation axis L parallel to the virtual first rotation axis L.One region of the first hinge structure and one region of the second hinge structure may rotate about the first rotation axis L, and another region of the first hinge structure and another region of the second hinge structure may rotate about the virtual second rotation axis L. That is, the first hinge structure and the second hinge structure may be folded about the virtual first rotation axis L and second rotation axis L, and details thereof will be described below. However, the hinge assembly is not limited to the aforementioned embodiment, and the hinge assembly may include three or more hinge structures (e.g., and ).The hinge assembly may further include a hinge plate disposed between the first hinge structure and the second hinge structure . The hinge plate may be supported by the hinge housing , and the hinge plate may support some regions of a flexible display . The hinge plate may be constructed of a metal or non-metal material having a specified rigidity to support the flexible display.illustrates the first hinge structure and the second hinge structure constructing a hinge assembly of an electronic device, according to an embodiment.Referring to , the first hinge structure and the second hinge structure includes a bracket structure , an arm structure , a rotation structure , a detent structure , and a support portion .The bracket structure includes a plurality of brackets and coupled with a first housing and a second housing and a fixing bracket which supports the plurality of brackets and . The plurality of brackets and coupled with the first housing and the second housing may rotate together with the first housing and the second housing in a process in which the electronic device rotates from a folded state to an unfolded state or rotates from the unfolded state to the folded state.The arm structure includes an arm coupled to some components (e.g., a shaft) of the rotation structure and rotatable within a specified range (e.g., 0° to 90° or 10° to 80°). The aforementioned arm may be coupled with one region of a bracket of the bracket structure and thus may be slid with respect to the bracket in a rotation process of the electronic device, as described below.The rotation structure includes a plurality of shafts and , a plurality of gears and coupled with the plurality of shafts and , a plurality of idle gears and gear-coupled with the plurality of gears and , and a shaft bracket supporting the plurality of shafts. As the plurality of shafts and , the plurality of gears and , and the plurality of idle gears and rotate in an engaged manner, the rotation structure may allow the first housing and the second housing to rotate by the same rotation angle. Arm portions and of the arm structure may be coupled to the shafts and of the rotation structure . Through the aforementioned structure, the arm portion may rotate about a rotation axis (or a turning axis) different from the brackets and of the bracket structure by rotating the electronic device from the folded state to the unfolded state or from the unfolded state to the folded state.The detent structure includes a detent plate having a detent portion constructed thereon, and a plurality of springs and . The detent portion may be constructed to protrude from one region of the detent plate facing the aforementioned arm portion. The detent portion may be constructed in a concavo-convex shape corresponding to a cam portion constructed in one region of the arm portions and . The detent portion may be engaged with the cam portion of the arm portions and to fix a movement of the arm portions and when the electronic device is in the folded state. The plurality of springs and may be disposed between the detent plate and the shaft bracket of the rotation structure in a compressed state, so that the detent plate is in contact with one region of the arm portions and .The support portion is disposed to an empty space between the plurality of arm portions and and the plurality of shafts and . The support portion may move up and down (e.g., a movement in a direction from the +y axis to the −y axis or from the −y axis to the +axis of ) between the flexible display and the hinge housing due to a rotation of the plurality of arm portions and .The support portion may move in a direction of the flexible display due to the rotation of the plurality of arm portions in the process in which the electronic device rotates from the folded state to the unfolded state. As a result, the support portion may be located to a rear face of the flexible display to support one region of the flexible display. The support portion may be in contact with at least one region of the rear face of the flexible display to support the flexible display. The support portion may be spaced apart by a minute distance from the flexible display to support one region of the flexible display. The first support plate and/or the second support plate may be attached to at least one region of the flexible display by an adhesive member (e.g., an adhesive). In the aforementioned case, the support portion may support at least one region of the rear face of the first support plate and/or the second support plate .On the contrary, in the process in which the electronic device rotates from the unfolded state to the folded state, the support portion may be spaced apart from the flexible display, and thus may not affect a driving trajectory of the flexible display.is an exploded perspective view of the first hinge structure and/or the second hinge structure of , according to an embodiment.Referring to , the hinge structure and/or includes a bracket structure , an arm structure , a rotation structure , a detent structure , a support portion , a stopper , an elastic member , and/or a screw . At least one of components of the first hinge structure and/or the second hinge structure of may be identical or similar to at least one of components of , and redundant descriptions will be omitted hereinafter.The bracket structure includes a first bracket , a second bracket , and a fixing bracket .The fixing bracket may be disposed adjacent to a hinge housing to support the first bracket and the second bracket . A first groove and a second groove may be constructed in an upper face of the fixing bracket (e.g., a face of the +y direction of ), and the first bracket and the second bracket may be coupled to the fixing bracket through the first groove and the second groove . The first groove and the second groove may be constructed in an arc shape having a specific curvature, the first bracket may be coupled to the first groove , and the second bracket may be coupled to the second grooveAlthough the first groove and the second groove may be constructed in an arc shape having the same curvature, the first groove and the second groove may be constructed in arc shapes having different curvatures. The first groove may be constructed in one region (e.g., a region of the +x direction of ) of the fixing bracket adjacent to the first bracket , and the second groove may be constructed in another region (e.g., a region of the −x direction of ) of the fixing bracket adjacent to the second bracket . A plurality of gear holes and a plurality of shaft holes may be constructed in one side face (e.g., a face of the +z direction of ) of the fixing bracket . A first idle gear and a second idle gear , to be described below, may be fastened to a first shift and a second shift on one side face of the fixing bracket through the aforementioned gear hole and shaft holeThe first bracket includes a first rail portion , a first slide hole , and a plurality of coupling holes . The first rail portion may be constructed to protrude in one region of the first bracket . The aforementioned first rail portion may be constructed in a shape corresponding to the first groove of the fixing bracket , and the first bracket may be coupled to the first groove of the fixing bracket through the first rail portion . The first slide hole may be constructed in one region of the first bracket adjacent to the first arm portion , and the first bracket and the first arm portion may be coupled through a first fixing portion which passes through the first slide hole and the first arm portion . The first fixing portion may be slid inside the first slide hole as the electronic device rotates from the folded state to the unfolded state or rotates from the unfolded state to the folded state, as described below.The plurality of coupling holes may be constructed in one face (e.g., a face of the +y direction of ) facing a first housing of the first bracket , and the first bracket may be coupled to one region of the first housing through the plurality of coupling holes . The first bracket coupled to the first housing may be slid along the first groove of the fixing bracket with the rotation of the first housing, and may rotate about a virtual first rotation axis L.The second bracket includes a second rail portion , a second slide hole , and a plurality of coupling holes . The second rail portion may be constructed to protrude in one region of the second bracket . The second rail portion may be constructed in a shape corresponding to the second groove of the fixing bracket , and the second bracket may be coupled to the second groove of the fixing bracket through the second rail portion . The second slide hole may be constructed in one region of the second bracket adjacent to the second arm portion , and the second bracket and the second arm portion may be coupled through a second fixing portion which passes through the second slide hole and the second arm portion . The second fixing portion may be slid inside the second slide hole as the electronic device rotates from the folded state to the unfolded state or rotates from the unfolded state to the folded state, as described below.The plurality of coupling holes may be constructed in one face (e.g., a face of the +y direction of ) facing a second housing (e.g., the second housing of ) of the second bracket , and the second bracket may be coupled to one region of the second housing through the plurality of coupling holes . The second bracket coupled to the second housing may be slid along the second groove of the fixing bracket with the rotation of the second housing, and may rotate about a virtual second rotation axis L. In this case, the virtual first rotation axis L and the virtual second rotation axis L are parallel, and may be constructed in a flat face parallel to the flexible display when the electronic device is in the folded state.The arm structure may include a first arm portion and a second arm portion .The first arm portion may include a first cam portion , a first support rib , a first insertion hole , and a first through-hole . The first insertion hole may be constructed in one region of a lower end (e.g., the −y direction of ) of the first arm portion , and the first shaft may be inserted to the first insertion hole to couple the first arm portion and the first shaft .As the first arm portion and the first shaft are coupled, the first arm portion may rotate about a rotation axis of the first shaft . The first cam portion may be constructed in a region adjacent to the first insertion hole , and may be constructed to protrude in a direction of the detent plate (e.g., the +z direction of ). The first cam portion may be constructed in a concavo-convex shape in which a plurality of peaks and valleys are repeated, and the first cam portion may be disposed to be engaged with the detent portion constructed in the detent plate to provide a sense of detent to the first arm portion .In addition, since the first cam portion may be disposed to be engaged with the detent portion constructed in the detent plate , the first arm portion may be fixed at a specified rotation angle and/or in a specified rotation angle range. As a result, a movement of the electronic device may be fixed at the specified rotation angle and/or in the specified rotation angle range (e.g., the range from 30° to 150°). The first support rib may be constructed to protrude from one region of the first arm portion , and may move the support portion in an upper direction (e.g., the +y direction of ) when the electronic device rotates from the folded state to the unfolded state. The first through-hole may be constructed in one region (e.g., a region of the +x direction of ) in the opposite side of a region in which the first insertion hole of the first arm portion is constructed. The first fixing portion passing through the first slide hole may pass through the first through-hole to couple the first bracket and the first arm portion .A first washer ring may be fastened to one end of the first fixing portion passing through the first through-hole , so that the first fixing portion is fixed to the first arm portion . Alternatively, the first washer ring may be fastened to the other end of the first fixing portion , so that the first fixing portion is fixed to the first bracket . Additionally or alternatively, a protrusion may be constructed in one region of the first bracket (or the first arm portion ), and a coupling groove corresponding to the protrusion may be constructed in one region of the first arm portion (or the first bracket ), so that the first bracket and the first arm portion are coupled with the protrusion through the coupling groove. The first arm portion coupled with the first bracket may rotate about a rotation axis different from that of the first bracket while sliding with respect to the first bracket , in the process in which the electronic device rotates from the folded state to the unfolded state or rotates from the unfolded state to the folded state.The second arm portion may include a second cam portion , a second support rib , a second insertion hole , and a second through-hole . The second insertion hole may be constructed in one region of a lower end (e.g., the −y direction of ) of the second arm portion , and the second shaft may be inserted to the second insertion hole to couple the second arm portion and the second shaft . As the second arm portion and the second shaft are coupled, the second arm portion may rotate about a rotation axis of the second shaft . The second cam portion may be constructed in a region adjacent to the second insertion hole , and may be constructed to protrude in a direction of the detent plate (e.g., the +z direction of ). Similarly to the first cam portion , the second cam portion may be constructed in a concavo-convex shape in which a plurality of peaks and valleys are repeated, and the second cam portion may be disposed to be engaged with the detent portion constructed in the detent plate to provide a sense of detent to the second arm portion .In addition, since the second cam portion may be disposed to be engaged with the detent portion constructed in the detent plate , the second arm portion may be fixed at a specified rotation angle and/or in a specified rotation angle range. As a result, a movement of the electronic device may be fixed at the specified rotation angle and/or in the specified rotation angle range (e.g., the range from 30° to 150°). The second support rib may be constructed to protrude from one region of the second arm portion , and may move the support portion in an upper direction (e.g., the +y direction of ) when the electronic device rotates from the folded state to the unfolded state. The second through-hole may be constructed in a region in the opposite side of the second insertion hole . The second fixing portion passing through the second slide hole may pass through the second through-hole to couple the second bracket and the second arm portion . A second washer ring may be fastened to one end of the second fixing portion passing through the second through-hole , so that the second fixing portion is fixed to the second arm portion . Alternatively, the second washer ring may be fastened to the other end of the second fixing portion , so that the second fixing portion is fixed to the second bracket . Additionally or alternatively, a protrusion may be constructed in one region of the second bracket (or the second arm portion ), and a coupling groove corresponding to the protrusion may be constructed in one region of the second arm portion (or the second bracket ), so that the second bracket and the second arm portion are coupled with the protrusion through the coupling groove. The second arm portion coupled with the second bracket may rotate about a rotation axis different from that of the first bracket while sliding with respect to the second bracket , in the process in which the electronic device rotates from the folded state to the unfolded state or rotates from the unfolded state to the folded state.The rotation structure includes the first shaft coupled with a first gear , the second shaft coupled with a second gear , the first idle gear , the second idle gear , a shaft bracket , and a gear cover .One end of the first shaft may be fastened to the shaft hole of the fixing bracket , and the other end of the first shaft may pass through a first shaft insertion hole of the shaft bracket . The first arm portion may be coupled to one region of the first shaft , and the first arm portion may rotate about the first shaft as the rotation axis.The second shaft may be disposed to a position adjacent to the first shaft . One end of the second shaft may be fastened to the shaft hole of the fixing bracket , and the other end of the second shaft may pass through a second shaft insertion hole of the shaft bracket . The second arm portion may be coupled to one region of the second shaft , and the second arm portion may rotate about the second shaft as the rotation axis.The first idle gear and the second idle gear may be disposed between the first gear coupled to the first shaft and the second gear coupled to the second shaft . The first idle gear and the second idle gear may be fastened to the plurality of gear holes of the fixing bracket , and the first idle gear and the second idle gear may rotate by being engaged with each other so that the first arm portion and the second arm portion rotate by the same rotation angle. The first idle gear may rotate by being engaged with the first gear and the second idle gear , and the second idle gear may rotate by being engaged with the first idle gear and the second gear . As the aforementioned first gear , second gear , first idle gear , and second idle gear rotate by the same rotation angle by being engaged with one another, the first shaft and the second shaft may rotate by the same rotation angle in opposite directions. For example, when the first shaft rotates by 30° counterclockwise (e.g., a direction from the +x axis to the +y axis of ), the second shaft may rotate by 30° clockwise (e.g., a direction from the −x axis to the +y axis of ). As the first shaft and the second shaft rotate by the same rotation angle, the first arm portion and second arm portion coupled to the first shaft and second shaft may rotate by the same rotation angle.The shaft bracket may include the first shaft insertion hole to which the first shaft is inserted and the second shaft hole to which the second shaft is inserted. The shaft bracket may be disposed inside a hinge housing to support the first shaft and second shaft inserted to the shaft bracket through the first shaft hole and the second shaft holeThe gear cover may be inserted to the first shaft and the second shaft to protect the first gear , the second gear , the first idle gear , and the second idle gear . The gear cover may prevent the first gear , the second gear , the first idle gear , and the second idle gear from being damaged by external force, and may prevent foreign matters from entering the first gear , the second gear , the first idle gear , and the second idle gear .The detent structure may include a detent plate , a first spring , and a second spring .A third shaft insertion hole to which the first shaft is inserted may be constructed in one region of the detent plate , and a fourth shaft insertion hole to which the second shaft is inserted may be constructed in another region of the detent plate . The detent plate may be coupled to the first shaft and the second shaft through the third shaft insertion hole and the fourth shaft insertion hole . The detent plate may include a first detent portion constructed to protrude in a direction of the first cam portion of the first arm portion and a second detent portion constructed to protrude in a direction of the second cam portion of the second arm portion . The first detent portion and the second detent portion may be constructed in a concavo-convex structure in which at least one peak and valley appear repeatedly. The first detent portion may be disposed to be engaged with the first cam portion , and thus, when the electronic device is in the folded state or the unfolded state, may provide a sense of detent to the first arm portion and fix a movement of the first arm portion at a specified rotation angle. Similarly, the second detent portion may be disposed to be engaged with the second cam portion and thus, when the electronic device is in the folded state or the unfolded state, may provide a sense of detent to the second arm portion and fix a movement of the second arm portion at a specified rotation angle.A pitch between a peak and another peak or between a valley and another valley of the first detent portion may be greater than a pitch between a peak and another peak or between a valley and another valley of the first cam portion , so that the first arm portion is rotatable within a specified rotation range even in a state where the first detent portion and the first cam portion are engaged. However, a shape of the first detent portion is not limited to the aforementioned embodiment. The pitch between the peaks or valleys of the first detent portion may be constructed to be identical to the pitch between the peaks or valleys of the first cam portion or the pitch between the peaks or valleys of the first cam portion may be constructed to be greater than the pitch between the peaks or valleys of the first detent portionSimilarly, a pitch between a peak and another peak or between a valley and another valley of the second detent portion may be greater than a pitch between a peak and another peak or between a valley and another valley of the second cam portion , so that the second arm portion is rotatable within a specified rotation range even in a state where the second detent portion and the second cam portion are engaged. However, a shape of the second detent portion is not limited to the aforementioned embodiment. The pitch between the peaks or valleys of the second detent portion may be constructed to be identical to the pitch between the peaks or valleys of the second cam portion or the pitch between the peaks or valleys of the second cam portion may be constructed to be greater than the pitch between the peaks or between the valleys of the second detent portionThe first spring may be disposed to surround one region of the first shaft , and the second spring may be disposed to surround one region of the second shaft . The first spring and the second spring may be disposed in a state of being compressed between the detent plate and the shaft bracket , so that the detent plate is closely in contact in a direction of the first arm portion and the second arm portion . As the detent plate is closely in contact in a direction of the first arm portion and the second arm portion , it is possible to maintain a state where the first detent portion and the first cam portion are engaged and a state where the second detent portion and the second cam portion are engaged.When the peak of the first detent portion and the peak of the first cam portion or the peak of the second detent portion and the peak of the second cam portion are in contact due to a rotation of the first arm portion and the second arm portion , the detent plate may move in one direction of the first shaft and second shaft (e.g., the +z direction of ), so that the first cam portion and the first detent portion and/or the second cam portion and the second detent portion are temporarily spaced apart. As the detent plate moves in one direction, the first spring and the second spring may be compressed. When the first arm portion and the second arm portion further rotate by a specific angle, the detent plate may move again in a direction of the first cam portion and/or the second cam portion due to elastic restoration force of the first spring and second spring . As a result, the first cam portion and the first detent portion may be disposed in a state of being engaged again with the second cam portion and the second detent portion , thereby maintaining a state where the first cam portion and the first detent portion are engaged and the second cam portion and the second detent portion are engaged.A flat linear region may be constructed in at least one region (e.g., a summit region) of the peak of the first cam portion , the peak of the second cam portion , the peak of the first detent portion , and/or the peak of the second detent portion . Similarly, a flat linear region may also be constructed in at least one region of the valley of the first cam portion , the valley of the second cam portion , the valley of the first detent portion , and/or the valley of the second detent portion . The linear region constructed in one region of the peak and the linear region constructed in one region of the valley may be constructed to be substantially identical or similar. As the linear region is constructed in the peaks and valleys of the first cam portion , second cam portion , first detent portion , and second detent portion , a movement of the first arm portion and/or second arm portion may be fixed at a specified rotation angle (e.g., 30° or 60°) and/or in a specified rotation angle range (e.g., a rotation angle range of 30° to 150°). As the movement of the first arm portion and/or second arm portion is fixed at the specified rotation angle, a movement of a first housing and second housing of the electronic device may be fixed at the specified rotation angle.The support portion may be disposed to form an empty space between the first arm portion and the second arm portion and the first shaft and the second shaft . When the electronic device is in an unfolded state, the support portion may support one region of a flexible display not supported by the first arm portion and/or the second arm portion . The support portion may move in an upper direction (e.g., the +y direction of ) by means of the first arm rib constructed in one region of the first arm portion and the second support rib constructed in one region of the second arm portion . In a process in which the electronic device rotates from the folded state to the unfolded state, the first support rib and the second support rib may be in contact with one region of the support portion , and the support portion may move in an upper direction (e.g., in a direction from the −y axis to the +y axis of ) by means of the first support rib and the second support rib with the rotation of the first arm portion and the second arm portion .The stopper may be located at a lower end of the support portion (e.g., the −y direction of ). A fifth shaft insertion hole may be constructed in one region of the stopper , and a sixth shaft insertion hole may be constructed in one region in the opposite side of the fifth shaft insertion hole . The first shaft and the second shaft may be inserted through the fifth shaft insertion hole and the sixth shaft insertion hole , and the first shaft , the second shaft , and the stopper may be coupled through the aforementioned structure. A through-hole may be constructed in one region of an upper end of the stopper (e.g., the +y direction of ), and a protrusion region of the support portion may be inserted in a lower direction of the stopper by passing through the through-holeThe screw may be coupled with the protrusion region inserted to the lower end of the stopper , and the elastic member may be disposed between the screw and the stopper . The elastic member may be a spring, but is not limited thereto. The elastic member may be in contact with one region of the stopper , and the elastic member may be compressed while the support portion moves in an upper direction in a process in which the electronic device rotates from the folded state to the unfolded state. On the contrary, in a process in which the electronic device rotates from the unfolded state to the folded state, the support portion may move in a lower direction (e.g., the −y direction of ) due to elastic restoration force of the elastic member .The first hinge structure and/or the second hinge structure may further include a first auxiliary member and a second auxiliary member . The first auxiliary member may be fastened to one end of the first shaft adjacent to the shaft bracket , and the second auxiliary member may be fastened to one end of the second shaft adjacent to the shaft bracket . A third washer ring may be fastened to one end of the first shaft , and thus the first shaft may be fixed to the first auxiliary member . Similarly, a fourth washer ring may be fastened to one end of the second shaft , and thus the second shaft may be fixed to the second auxiliary member . A screw nut may be fastened to one end of the first shaft so that the first shaft is fixed to the first auxiliary member , and/or a screw nut may be fastened to one end of the second shaft so that the second shaft is fixed to the second auxiliary member .The first auxiliary member may include a third support rib , and the third support rib may be constructed to protrude from one region of the first auxiliary member . Similarly, the second auxiliary member may include a fourth support rib , and the fourth support rib may be constructed to protrude from one region of the second auxiliary member . The first auxiliary member may rotate by the same rotation angle as the first arm portion through the first shaft , and the second auxiliary member may rotate by the same rotation angle as the second arm portion through the second shaft . When the electronic device rotates from the folded state to the unfolded state, the third support rib and the fourth support rib may allow the support portion to move in an upper direction together with the first support rib of the first arm portion and the second support rib of the second arm portion .illustrates a configuration of a hinge structure when an electronic device is in an unfolded state, according to an embodiment. illustrates a configuration of the hinge structure when the electronic device rotates from the unfolded state to a folded state, according to an embodiment. illustrates a structure of the hinge structure when the electronic device is in the folded state, according to an embodiment.A movement of a first arm portion , second arm portion , first bracket , and second bracket due to a rotation of an electronic device will be described with reference to to .Referring to , , and , an electronic device includes the hinge structure . The hinge structure may include the first bracket , the second bracket , a fixing bracket , the first arm portion , the second arm portion , a first fixing portion , a second fixing portion , a support portion , a first shaft in which a first gear and a first spring are coupled, a second shaft in which a second gear and a second spring are coupled, a first idle gear , a second idle gear , a shaft bracket , a first auxiliary member , and a second auxiliary member . At least one of components of the aforementioned hinge structure may be identical or similar to at least one of components of .The first bracket and the second bracket may be mounted to a first groove and a second groove constructed in the fixing bracket so as to be supported by the fixing bracket . The first bracket may include a first rail portion constructed in a shape corresponding to the first groove , and the second bracket may include a second rail portion constructed in a shape corresponding to the second groove . The first bracket may rotate by sliding inside the first groove through the first rail portion , and the second bracket may rotate by sliding inside the second groove through the second rail portionThe first bracket may be coupled to at least one region of a first housing to rotate in association with the first housing. Similarly, the second bracket may be coupled to at least one region of a second housing to rotate in association with the second housing. Through the aforementioned structure, the first bracket may rotate within a specified range about a virtual first rotation axis L, and the second bracket may rotate within a specified range about a virtual second rotation axis L adjacent to the first rotation axis L. The first bracket may rotate within an angle range from 0° to an angle (e.g., 90°) at which the electronic device is in the folded state with respect to the +x axis, and the second bracket may rotate within an angle range from 180° to an angle at which the electronic device is in the folded state with respect to the +x axis. When the electronic device is in the unfolded state, the first bracket and the second bracket may be disposed to be horizontal to each other, and when the electronic device is in the folded state, the first bracket and the second bracket may be disposed to face each other.The first arm portion may be coupled to one region of the first shaft to rotate together with the first shaft . The second arm portion may be coupled to one region of the second shaft adjacent to the first shaft to rotate together with the second shaft . The first arm portion may rotate about a rotation axis L (hereinafter, a “third rotation axis”) of the first shaft due to the aforementioned coupling structure. In addition, the second arm portion may rotate about a rotation axis L (hereinafter, a “fourth rotation axis”) of the second shaft . When the electronic device is in the unfolded state, the first arm portion and the second arm portion may be disposed to be horizontal to each other, and when the electronic device is in the folded state, the first arm portion and the second arm portion may be disposed to face each other.The first arm portion and the second arm portion may rotate by the same angle through the first gear of the first shaft , the second gear of the second shaft , the first idle gear , and the second idle gear .When the first shaft rotates by a specific angle, the first gear may also rotate by the same angle. The rotation of the first gear may be transferred to the first idle gear engaged with the first gear , and the rotation transferred to the first idle gear may be transferred to the second gear through the second idle gear engaged with the first idle gear . The second shaft may also rotate by a specific angle due to the rotation transferred to the second gear . Through the aforementioned process, the first arm portion coupled with the first shaft and the second arm portion coupled with the second arm may rotate by the same angle.The first rotation axis L and the second rotation axis L may be constructed between the third rotation axis L and the fourth rotation axis L. In addition, as the first rotation axis L and the second rotation axis L are constructed in an upper end region (e.g., the +y direction of ) of the third rotation axis L and fourth rotation axis L, the first rotation axis L and the second rotation axis L may be constructed on a flexible display. That is, the first bracket , the second bracket , the first arm portion , and the second arm portion may rotate within a specified angle range about rotation axes different from one another.The first bracket may be coupled with one region of the first arm portion through the first fixing portion , and the second bracket may be coupled with one region of the second arm portion through the second fixing portion .A first slide hole may be constructed in one region adjacent to the first arm portion of the first bracket , and the first fixing portion may pass through the first slide hole to couple the first bracket and the first arm portion . Similarly, a second slide hole may be constructed in one region adjacent to the second arm portion of the second bracket , and the second fixing portion may pass through the second slide hole to couple the second bracket and the second arm portion .As the first bracket rotates together with the first housing, the first fixing portion may be slid inside the first slide hole . Due to the sliding of the first fixing portion , the first arm portion coupled with the first bracket through the first fixing portion may also be slid together. Similarly, due to the rotation of the second housing, the second fixing portion may be slid inside the second slide hole . Due to the sliding of the second fixing portion , the second arm portion coupled with the second bracket through the second fixing portion may also be slid together.Referring to , when the electronic device in which the first bracket , the second bracket , the first arm portion , and the second arm portion are disposed on the same plane is in the unfolded state, the first fixing portion may be disposed outside the first slide hole , and the second fixing portion may be disposed outside the second slide holeReferring to , in a process in which the electronic device rotates from the unfolded state to the folded state, the first housing and the second housing may rotate by a first angle (e.g., 30° with respect to the +x axis or the −x axis) by a user's manipulation or external force. As the first housing and the second housing rotate, the first bracket and the second bracket coupled to the first housing and the second housing may also rotate by the first angle.In a process in which the first bracket rotates counterclockwise (e.g., in a direction from the +x axis to the +y axis of ), the first fixing portion may be slid by a specific distance in an inward direction from the outside of the first slide hole . The first arm portion may rotate counterclockwise by a second angle greater than the first angle due to the sliding of the first fixing portion . Similarly, the second arm portion may rotate by the second angle clockwise due to the sliding of the second fixing portion .Referring to , when the electronic device is in the folded state, the first bracket and the first arm portion , and the second bracket and the second arm portion , may respectively be disposed to face each other in one face. The first bracket , the second bracket , the first arm portion , and the second arm portion may be disposed to be substantially vertical to the +x axis or to have an angle (e.g., 800 to 100°) at which the electronic device is in the folded state. When the electronic device is in the folded state, the first fixing portion may be disposed inside the first slide hole , and the second fixing portion may also be disposed inside the second slide holeThat is, the first fixing portion may be slid in an inward direction from the outside of the first slide hole in the process in which the electronic device rotates from the unfolded state to the folded state, and on the contrary, may be slid in an outward direction from the inside of the first slide hole in the process in which the electronic device rotates from the folded state to the unfolded state. In this case, the second fixing portion may be slid in the same manner as the first fixing portion .In a process in which the first bracket and the second bracket rotate about the virtual first rotation axis L and second rotation axis L by a user's manipulation or external force, the first fixing portion and the second fixing portion may be respectively slid inside the first slide hole and the second slide hole . Due to the sliding of the first fixing portion and second fixing portion , the first arm portion and the second arm portion may rotate about the third rotation axis L and the fourth rotation axis L. As a result, the first arm portion may rotate about a rotation axis (e.g., L) different from the first bracket due to the rotation of the first bracket . Similarly, the second arm portion may rotate about a rotation axis (e.g., L) different from the second bracket due to the rotation of the second bracket .illustrates elements of a first fixing portion or a second fixing portion , and a detent structure of a hinge structure , according to an embodiment. Hereinafter, elements of the first fixing portion , the second fixing portion , the first coupling arm portion , the second coupling arm portion , the first bracket , the second bracket , and the detent structure will be described with reference to .Referring to , the hinge structure of an electronic device includes the first bracket , the second bracket , a fixing bracket , the first arm portion , the second arm portion , the first fixing portion , the second fixing portion , a first shaft to which a first gear is coupled, a second shaft to which a second gear is coupled, a first idle gear , a second idle gear , the detent structure , a support portion , a first auxiliary member , and a second auxiliary member . At least one of components of the hinge structure of may be identical or similar to at least one of components of , and redundant descriptions will be omitted hereinafter.The first bracket and the first arm portion may be coupled through the first fixing portion which passes through one region of the first bracket and first arm portion . The second bracket and the second arm portion may be coupled through the second fixing portion which passes through one region of the second bracket and second arm portion . The first fixing portion and the second fixing portion may be constructed in a pin shape which extends in a longitudinal direction (e.g., the +x direction of ).The hinge structure may further include a first elastic body and a second elastic body . The first elastic body and the second elastic body may be a spring or a disk spring, but are not limited thereto.The first elastic body may be disposed along an outer circumferential surface of the first fixing portion , and may be disposed in a compressed state between the first arm portion and a first washer ring . Some regions of the first elastic body may pass through some regions of the first arm portion , and may be disposed between the first arm portion and the first washer ring . As the first elastic body is disposed in a compressed state between the first arm portion and the first washer ring , a frictional force may be generated between the first arm portion and the first bracket . A torque may be generated in a direction opposite to a rotation direction of the first arm portion due to the frictional force generated between the first arm portion and the first bracket , and a movement of the first arm portion may be fixed due to the generated torque. That is, the hinge structure may fix the movement of the first arm portion in a free stop manner in the process in which the electronic device rotates from the folded state to the unfolded state or rotates from the unfolded state to the folded state without a separate additional component by using the first elastic bodyThe second elastic body may be disposed to an outer circumferential surface of the second fixing portion , and may be disposed in a compressed state between the second arm portion and a second washer ring . Some regions of the second elastic body may pass through some regions of the second arm portion , and may be disposed between the second arm portion and the second washer ring . As the second elastic body is disposed in a compressed state between the second arm portion and the second washer ring , a frictional force may be generated between the second arm portion and the second bracket . A torque may be generated in a direction opposite to a rotation direction of the second arm portion due to the frictional force generated between the second arm portion and the second bracket , and the movement of the second arm portion may be fixed due to the generated torque. That is, the hinge structure may fix a movement of the second arm portion in the process in which the electronic device rotates from the folded state to the unfolded state or rotates from the unfolded state to the folded state without a separate additional component by using the second elastic bodyThe detent structure of the hinge structure may include the detent plate , a first spring , and a second spring .A shaft insertion hole (e.g., the third shaft insertion hole and/or fourth shaft insertion hole ) may be constructed in at least one region of the detent plate , so that the first shaft and the second shaft are coupled to the detent plate . Additionally or alternatively, a diameter of the shaft insertion hole may be constructed to be greater than a diameter of the second shaft , so that the first shaft and the second shaft can freely rotate in a state of being coupled with the detent plate . The detent plate may include a first detent portion constructed to protrude along a longitudinal direction of the first shaft and a second detent portion constructed to protrude along a longitudinal direction of the second shaft . The first detent portion may be disposed to be engaged with a first cam portion of the first arm portion , and the second detent portion may be disposed to be engaged with a second cam portion of the second arm portion , so that the first arm portion and the second arm portion can provide a sense of detent to the first arm portion and the second arm portion .The first spring may be coupled with the first shaft so as to be located between the detent plate and a shaft bracket supporting the first shaft . The second spring may be coupled with the second shaft adjacent to the first shaft , so as to be located between the detent plate and the shaft bracket supporting the second shaft .The first spring and the second spring may be disposed in a compressed state to the shaft bracket and the detent plate , and pressure may be applied to the shaft bracket in a direction opposite to the detent plate due to elastic restoration force of the first spring and second spring . Due to the elastic restoration force of the first spring and second spring , the first detent portion and second detent portion of the detent plate may maintain a state of being engaged with the first cam portion of the first arm portion and the second cam portion of the second arm portion . With the rotation of the first arm portion and second arm portion , the detent plate may be temporarily spaced apart in a direction of the shaft bracket . The first spring and the second spring may be compressed due to the detent plate being spaced apart. Due to elastic restoration force of the compressed first spring and second spring , the detent plate may move again in a direction of the first arm portion and the second arm portion .That is, even if the detent plate is temporarily spaced apart from the first arm portion and the second arm portion , the detent plate may be in contact again with the first arm portion and the second arm portion by means of the first spring and the second spring . The detent structure may maintain an engagement state between the first detent portion and the first cam portion and between the second detent portion and the second cam portion through the aforementioned structure.illustrates a coupling relationship between some elements of a first arm structure and/or a second arm structure and a detent structure of a hinge structure , according to an embodiment.Referring to , a hinge structure and/or of an electronic device includes the first arm portion , the second arm portion , and the detent plate .The first arm portion may include a first cam portion and a first support rib , and the second arm portion may include a second cam portion and a second support rib . The first support rib of the first arm portion and the second support rib of the second arm portion may allow a support portion to move in an upper direction.The first cam portion of the first arm portion and the second cam portion of the second arm portion may be constructed in a concavo-convex structure in which a peak (e.g., A of ) and a valley (e.g., B of ) appear repeatedly. The first arm portion and the second arm portion may be coupled with the detent plate , and thus may be disposed such that the first cam portion is engaged with a first detent portion , and the second cam portion is engaged with a second detent portionThe detent plate may include the first detent portion constructed to protrude in a direction of the first cam portion of the first arm portion and the second detent portion constructed to protrude in a direction of the second cam portion of the second arm portion . The first detent portion and the second detent portion may be constructed in a concavo-convex structure in which a peak (e.g., a of ) and a valley (e.g., b of ) appear repeatedly. The peak and valley of the first detent portion may be constructed in a shape corresponding to the peak and valley of the first cam portion , and the peak and valley of the second detent portion may be constructed in a shape corresponding to the peak and valley of the second cam portion . The peak (e.g., a of ) of the first detent portion and the valley (e.g., B of ) of the first cam portion may be disposed to correspond to each other, and the valley (e.g., b of ) of the first detent portion and the peak (e.g., A of ) of the first cam portion may be disposed to correspond to each other, so that the first detent portion and the first cam portion are engaged with each other. Similarly, the peak of the second detent portion and the valley of the second cam portion may be disposed to correspond to each other, and the valley of the second detent portion and the peak of the second cam portion may be disposed to correspond to each other, so that the second detent portion and the second cam portion are engaged with each other.As it is disposed such that the first cam portion and the first detent portion are engaged and the second cam portion and the second detent portion are engaged, the detent plate may provide a sense of detent to the first arm portion and the second arm portion . A pitch between a peak and peak (or valley and valley) of the first detent portion may be constructed to be longer than a pitch between a peak and peak (or valley and valley) of the first cam portion , so that the first cam portion rotates within a specified angle range even if it is in a state of being engaged with the first detent portion . Additionally or alternatively, the pitch between the peak and peak (or valley and valley) of the first detent portion may be constructed to be equal to the pitch between the peak and peak (or valley and valley) of the first cam portion or may be constructed to be shorter than the pitch between the peak and peak (or valley and valley) of the first cam portion . In a process in which the electronic device rotates from a folded state to an unfolded state or rotates from the unfolded state to the folded state, there may be case where the peak of the first cam portion of the first arm portion is engaged with the peak of the first detent portion so that the first arm portion and the detent plate are temporarily spaced apart. In a process in which the peak of the first cam portion is beyond the peak of the first detent portion , the first detent portion may provide a sense of detent to the first arm portion . Additionally or alternatively, the second detent portion may also provide a sense of detent to the second arm portion in the same or similar manner as the first detent portionThe first detent portion and the second detent portion may not only provide the sense of detent to the first arm portion and the second arm portion but also fix a movement of the first arm portion and second arm portion .A flat linear region may be constructed in at least one region (e.g., a summit region) of the peak of the first cam portion , the peak of the second cam portion , the peak of the first detent portion , and/or the peak of the second detent portion . Similarly, a flat linear region may also be constructed in at least one region of the valley of the first cam portion , the valley of the second cam portion , the valley of the first detent portion , and/or the valley of the second detent portion . The linear region constructed in one region of the peak and the linear region constructed in one region of the valley may be constructed to be substantially identical or similar. As described above, as the linear region is constructed in the peaks and valleys of the first cam portion , second cam portion , first detent portion , and second detent portion , the movement of the first arm portion and/or second arm portion may be fixed at a specified rotation angle (e.g., 30° or 60°). As the movement of the first arm portion and/or second arm portion is fixed at the specified rotation angle, a movement of a first housing and second housing of the electronic device may be fixed at the specified rotation angle.is an enlarged view illustrating elements of a hinge structure , according to an embodiment. The hinge structure of illustrates a state where a support portion is removed.Referring to , the hinge structure of an electronic device includes a first bracket , a second bracket , a first arm portion , a second arm portion , a first fixing portion , a second fixing portion , a first shaft to which a first gear is coupled, a second shaft to which a second gear is coupled, a first idle gear , a second idle gear , a shaft bracket , a first spring , a second spring , a stopper , a first auxiliary member , and a second auxiliary member . At least one component of the hinge structure of may be identical or similar to at least one of component of , and redundant descriptions will be omitted hereinafter.The first arm portion may include a first support rib , and the second arm portion may include a second support rib . The first support rib may be constructed to protrude from one region of the first arm portion . In addition, the second support rib may be constructed to protrude from one region of the second arm portion . When the electronic device is in an unfolded state, the first support rib may be constructed to protrude in a direction of the stopper located between the first arm portion and the second arm portion from the first arm portion . Similarly, the second support rib may be constructed to protrude in a direction of the stopper from the second arm portion .The first support rib may be constructed integrally with the first arm portion , and may rotate along with a rotation of the first arm portion . In addition, the second support rib may be constructed integrally with the second arm portion , and may rotate along with a rotation of the second arm portion . As the first support rib and the second support rib rotate together with the first arm portion and the second arm portion , a support portion disposed on the stopper may move in an upper direction (e.g., the +y direction of ). In a process in which the electronic device rotates from the folded state to the unfolded state, at least one region of the first support rib and second support rib may be in contact with one region of the support portion (e.g., a rear face of the support portion ).According to an embodiment, as the first arm portion rotates clockwise (e.g., the direction {circle around (1)} of ), the first support rib may move the support portion in an upper direction. On the other hand, as the second arm portion rotates counterclockwise (e.g., the direction {circle around (2)} of ), the second support rib may move the support portion in an upper direction.The first auxiliary member may be coupled to one end of the first shaft adjacent to the first arm portion , and the second auxiliary member may be coupled to one end of the second shaft of the second arm portion . The first auxiliary member may be coupled to the first shaft to rotate together with the first shaft . The second auxiliary member may be coupled to the second shaft to rotate together with the second shaft .The first auxiliary member may include a third support rib constructed to protrude from one region of the first auxiliary member . In addition, the second auxiliary member may include a fourth support rib constructed to protrude from one region of the second auxiliary member . The third support rib may be disposed at a position parallel to the first support rib of the first arm , and the fourth support rib may be disposed at a position parallel to the second support rib of the second arm portion . The third support rib may be spaced apart from the first support rib to rotate by the same rotation angle as the first support rib with the rotation of the first shaft . The fourth support rib may be spaced apart from the second support rib to rotate by the same rotation angle as the second support rib with the rotation of the second shaft .The third support rib and the fourth support rib may move the support portion in an upper direction in the process in which the electronic device rotates from the folded state to the unfolded state, similarly to the first support rib and the second support rib . The third support rib and the fourth support rib may be in contact with one region of the support portion in the process in which the electronic device rotates from the folded state to the unfolded state. As the first shaft rotates clockwise (e.g., the direction {circle around (1)} of ), the third support rib may move the support portion in an upper direction. Otherwise, as the second shaft rotates counterclockwise (e.g., the direction {circle around (2)} of ), the fourth support rib may move the support portion in an upper direction.That is, the hinge structure may move the support portion in an upper direction in the process in which the electronic device rotates from the folded state to the unfolded state through the first support rib , the second support rib , the third support rib , and the fourth support rib . Accordingly, the support portion can be in contact with a rear face of a flexible display , thereby preventing the flexible display from being sagged and/or damaged when the electronic device is in the unfolded state.is a cross-sectional view of a hinge structure when an electronic device is in an unfolded state, according to an embodiment. is a cross-sectional view of the hinge structure when the electronic device is in a folded state, according to an embodiment. may illustrate a cross-section of the hinge structure of , cut along the direction A-A′, and may illustrate a cross-section of the hinge structure of , cut along the direction A-A′.Referring to and , an electronic device includes a flexible display , a first support plate supporting the flexible display , a second support plate , and the hinge structureThe hinge structure may include a first bracket , a second bracket , a first arm portion , a second arm portion , a support portion , a stopper , an elastic member , and a screw .The support portion may move in a direction of a rear face of the flexible display by means of a first support rib of the first arm portion and a second support rib of the second arm portion , when the electronic device rotates from the folded state to the unfolded state as described above. Through the aforementioned process, the support portion may support one region of the flexible display not supported by the first arm portion and the second arm portion , when the electronic device is in the unfolded state, as illustrated in .When the electronic device is in the unfolded state, a gap (e.g., g of ) may be constructed between the support portion and/or the first support rib of the first arm portion and the second support rib of the second arm portion . When the electronic device is in the unfolded state, as the gap is constructed between the support portion and/or the first support rib and the second support rib , the support portion can be prevented from moving in a direction of the flexible display by at least a specified distance. When the electronic device is in the unfolded state, the gap between the support portion and the first support rib and the second support rib may be constructed to be greater than a gap between a protrusion region (e.g., a fixing region E of ) of a shaft bracket or a protrusion region (e.g., a fixing region E of ) of the stopper and a fixing rib constructed in one region of the support portion . As a result, the support portion can be prevented from moving in a duplicate manner in an upper direction (e.g., the +y direction of ) by means of the first support rib and the second support rib . That is, when the electronic device is in the unfolded state, the hinge structure can prevent the flexible display from being damaged by the support portion through the gap constructed between the support portion and/or the first support rib and the second support ribThe stopper may be located at a lower end (e.g., the −y direction of ) of the support portion , and a through-hole may be constructed in one region of the stopper . A protrusion region of the support portion may be located at a lower end of the stopper by passing through the through-hole , and the screw may be coupled to the protrusion region of the support portion passing through the through-hole . An outer circumferential surface of one face of the screw facing the protrusion region may be constructed to be greater than an outer circumferential surface of the protrusion region , so that the elastic member is disposed between the stopper and the screw . The elastic member may be a spring, but is not limited thereto.One end of the elastic member may be in contact with one region of the stopper (e.g., a neighboring region of the through-hole ), and the other end may be in contact with the screw coupled to the protrusion region of the support portion . The elastic member may be compressed when the support portion moves in an upper direction (e.g., the +y direction of ), or may be restored to its original state due to elastic restoration force.As the electronic device rotates from the folded state to the unfolded state, the support portion moves in a direction of the flexible display . The screw coupled to the protrusion region may also move in an upper direction (e.g., the +y direction of ) due to the movement of the support portion , and the elastic member may be compressed due to the upward movement of the screw .As the electronic device rotates from the unfolded state to the folded state, the first arm portion may rotate counterclockwise (e.g., the direction (of ), and the second arm portion may rotate clockwise (e.g., the direction D of ), so that the first support rib and the second support rib are spaced apart from the support portion . As the first support rib and second support rib are spaced apart from the support portion , pressure may be applied to the screw in a lower direction (e.g., the −y direction of ) due to elastic restoration force of the compressed elastic member . Due to the pressure applied to the screw , the screw and the support portion coupled with the screw may move in a lower direction (e.g., the −y direction of ). That is, in a process in which the electronic device rotates from the unfolded state to the folded state, the support portion may be spaced apart from the flexible display due to the elastic restoration force of the elastic member located between the stopper and the screw .Through the aforementioned driving process, the support portion may not interrupt a rotation trajectory (or a “driving trajectory”) of the flexible display or the first support plate and the second support plate in the process in which the electronic device rotates from the unfolded state to the folded state. On the other hand, when the electronic device is in the unfolded state, the support portion may support one region of the flexible display not supported by the first arm portion and the second arm portion , thereby preventing the flexible display from being damaged or sagged.is a cross-sectional view of a hinge structure when an electronic device is in an unfolded state, according to an embodiment. is a cross-sectional view of the hinge structure when the electronic device is in a folded state, according to an embodiment. may illustrate a cross-section of the hinge structure of , cut along the direction A-A′, and may illustrate a cross-section of the hinge structure of , cut along the direction A-A′.Referring to and , an electronic device includes a flexible display , a first support plate supporting the flexible display , a second support plate , and a hinge structureThe hinge structure may include a first bracket , a second bracket , a first arm portion , a second arm portion , a support portion , a stopper , and an elastic member . At least one component of the hinge structure of and may be identical or similar to at least one of component of and , and redundant descriptions will be omitted hereinafter.The hinge structure may move the support portion in an upper direction (e.g., the +y direction of ) or a lower direction (e.g., the −y direction of ) in a manner that is different from and .The support portion may move in a direction of a rear face of the flexible display by means of a first support rib of the first arm portion and a second support rib of the second arm portion , when the electronic device rotates from the folded state to the unfolded state as described above. Through the aforementioned process, the support portion may support one region of the flexible display not supported by the first arm portion and the second arm portion , when the electronic device is in the unfolded state, as illustrated in .When the electronic device is in the unfolded state, a gap (e.g., g of ) may be constructed between the support portion and/or the first support rib of the first arm portion and the second support rib of the second arm portion . When the electronic device is in the unfolded state, as the gap is constructed between the support portion and/or the first support rib and the second support rib , the support portion can be prevented from moving in a direction of the flexible display by at least a specified distance. When the electronic device is in the unfolded state, the gap between the support portion and/or the first support rib and the second support rib may be constructed to be greater than a gap between a protrusion region (e.g., the fixing region E of ) of the shaft bracket or a protrusion region (e.g., the fixing region E of ) of the stopper and a fixing rib constructed in one region of the support portion . As a result, the support portion can be prevented from moving in a duplicate manner in an upper direction (e.g., the +y direction of ) by means of the first support rib and the second support rib . That is, when the electronic device is in the unfolded state, the hinge structure can prevent the flexible display from being damaged by the support portion through the gap constructed between the support portion and the first support rib and the second support ribThe stopper may be located at a lower end (or a rear face) of the support portion , and a groove may be constructed in at least one region of the stopper . An inner space may be constructed in the stopper due to the groove constructed at the stopper , and a protrusion region of the support portion may be located inside the space.The elastic member may be a spring, and may be located inside the inner space of the stopper constructed by the groove . One end of the elastic member may be coupled to one region of the support portion , and the other end of the elastic member may be coupled to one region of the inner space of the stopper . The elastic member may be attached to one region of the support portion and/or one region of the inner space of the stopper by an adhesive. The elastic member may be coupled to one region of the support portion and stopper through a fixing member located in one region of the support portion and/or one region of the inner space of the stopper . The protrusion region of the support portion may be partially inserted into the elastic member to guide a direction of a motion (e.g., compression or elongation) of the elastic member .According to an embodiment, as the electronic device rotates from the folded state to the unfolded state, the support portion moves in a direction of the flexible display by means of the first support rib and the second support rib . The elastic member coupled to one region of the support portion and one region of the stopper is elongated due to the upward movement of the support portion .As the electronic device rotates from the unfolded state to the folded state, the first arm portion may rotate counterclockwise (e.g., the direction U of ), and the second arm portion may rotate clockwise (e.g., the direction D of ), so that the first support rib and the second support rib are spaced apart from the support portion . As the first support rib and the second support rib are spaced apart from the support portion , the support portion may move in a lower direction (e.g., the −y direction of ) due to the elastic restoration force of the elastic member , thereby being spaced apart from the flexible display .That is, when the electronic device is in the unfolded state, the support portion may support one region of the flexible display not supported by the first arm portion and the second arm portion , thereby preventing the flexible display from being damaged or sagged. On the other hand, in a process in which the electronic device rotates from the unfolded state to the folded state, the support portion may be spaced apart from the flexible display due to the elastic restoration force of the elastic member . Accordingly, the support portion may not interrupt a rotation trajectory (“driving trajectory”) of the flexible display or the first support plate and the second support plate .is a cross-sectional view of a hinge structure when an electronic device is in an unfolded state, according to an embodiment. is a cross-sectional view of the hinge structure when the electronic device is in a folded state, according to an embodiment. may illustrate a cross-section of the hinge structure of , cut along the direction B-B′, and may illustrate a cross-section of the hinge structure of , cut along the direction B-B′.Referring to and , a hinge structure of an electronic device includes a second bracket , a fixing bracket , a second arm portion , a second fixing portion coupling the second bracket and the second arm portion , a rotation structure including a second shaft , a second idle gear , and a shaft bracket , a support portion , a stopper , an elastic member , and a screw . At least one component of the hinge structure of and may be identical or similar to at least one component of , and , and redundant descriptions will be omitted hereinafter.The support portion may be located on the stopper , and may include a protrusion region and a fixing rib . The protrusion region may be constructed to protrude in a lower direction (e.g., the −y direction of ) of the support portion , and may be coupled with the screw as described above to compress the elastic member in a process in which the electronic device rotates from the folded state to the unfolded state. The fixing rib may be constructed to protrude in a lower direction of the support portion similarly to the protrusion region , and in a lateral view, may be constructed in a hook shape curved in a direction of the shaft bracket .The fixing rib may be fixed to one region of the shaft bracket to prevent the support portion from moving by at least a specified distance in an upper direction (e.g., the +y direction of ) or in a direction of a flexible display (e.g., the flexible display of ) in the process in which the electronic device rotates from the folded state to the unfolded state.The shaft bracket may include a fixing region E. The fixing region E may be constructed to protrude in a direction of the stopper from one region of the shaft bracket . As the electronic device rotates from the folded state (e.g., see ) to the unfolded state (e.g., see ), the support portion may move in an upper direction, and the fixing rib of the support portion may be in contact with the fixing region E of the shaft bracket due to the upward movement of the support portion .When the electronic device is in the unfolded state, the hook-shaped fixing rib may be in contact with a lower region of the fixing region E so that the fixing rib of the support portion is caught at the fixing region E of the shaft bracket . When the support portion moves in an upper direction by at least a specified distance, pressure may be applied in the upper direction to the flexible display disposed to an upper end of the support portion , and some regions of the flexible display may be damaged due to the pressure applied by the support portion . When the electronic device is in the unfolded state, the fixing rib of the support portion may be disposed to be in contact with the fixing region E of the shaft bracket without a gap, so that the support portion can be prevented from moving in the upper direction by at least a specified distance.When the electronic device rotates from the unfolded state to the folded state, the support portion may move in a lower direction (e.g., the −y direction of ) due to elastic restoration force of the elastic member as described above. Accordingly, the fixing rib may be spaced apart from the fixing region E of the shaft bracket . As the fixing rib is spaced apart from the fixing region E of the shaft bracket , the support portion may move in a lower direction without being affected by the fixing region E.That is, the hinge structure may control the movement of the support portion so that the support portion moves in an upper direction within a specified range through the fixing rib of the support portion and the fixing region E of the shaft bracket .is a cross-sectional view of a hinge structure when an electronic device is in an unfolded state, according to another embodiment. is a cross-sectional view of the hinge structure when the electronic device is in a folded state, according to an embodiment. may illustrate a cross-section of the hinge structure of , cut along the direction B-B′, and may illustrate a cross-section of the hinge structure of , cut along the direction B-B′. Referring to and , a hinge structure of an electronic device includes a second bracket , a fixing bracket , a second arm portion , a second fixing portion coupling the second bracket and the second arm portion , a rotation structure including a second shaft and a second idle gear , a support portion , a stopper , an elastic member , and a screw .The hinge structure of and can prevent the support portion from moving in an upper direction (e.g., the +y direction of ) in a manner different from the manner in and . At least one component of the hinge structure of and may be identical or similar to at least one component of and , and redundant descriptions will be omitted hereinafter.The support portion may be located on the stopper , and may include a protrusion region and a fixing rib . The protrusion region may be constructed to protrude in a lower direction (e.g., the −y direction of ) of the support portion , and may be coupled with the screw to compress the elastic member in a process in which the electronic device rotates from the folded state to the unfolded state. The fixing rib may be constructed to protrude in a lower direction of the support portion , and in a lateral view, may be constructed in a hook shape curved in a direction of the stopper .The fixing rib may be fixed to one region of the stopper to prevent the support portion from moving by at least a specified distance in an upper direction (e.g., the +y direction of ) or in a direction of a flexible display in the process in which the electronic device rotates from the folded state to the unfolded state.The stopper may include a fixing region E. The fixing region E may be constructed to protrude in a direction of the shaft bracket from one region of the stopper . As the electronic device rotates from the folded state, as illustrated in , to the unfolded state, as illustrated in , the support portion may move in an upper direction, and the fixing rib of the support portion may be in contact with the fixing region E of the stopper due to the upward movement of the support portion .When the electronic device is in the unfolded state, the hook-shaped fixing rib may be in contact with a lower end of the fixing region E of the stopper so that the fixing rib of the support portion is caught at the fixing region E.When the support portion moves in an upper direction by at least a specified distance, some regions of the flexible display may be damaged due to the pressure applied by the support portion . When the electronic device is in the unfolded state, the fixing rib of the support portion may be disposed to be in contact with the fixing region E of the stopper , so that the support portion can be prevented from moving in the upper direction by at least a specified distance.Additionally or alternatively, when the electronic device rotates from the unfolded state to the folded state, the support portion may move in a lower direction (e.g., the −y direction of ) due to elastic restoration force of the elastic member as described above. Due to the movement of the support portion , the fixing rib may be spaced apart from the fixing region E of the stopper . As the fixing rib is spaced apart from the fixing region E of the stopper , the support portion may move in a lower direction without being affected by the fixing region E.That is, unlike and , the hinge structure of and may control the movement of the support portion so that the support portion moves in an upper direction within a specified range through the fixing rib of the support portion and the fixing region E of the stopper .According to an embodiment, an electronic device may include a first housing, a second housing, a hinge assembly coupling the first housing and the second housing so that the second housing is rotatable with respect to the first housing, and a flexible display disposed from one region of the first housing to at least one region of the second housing across the hinge assembly. The hinge assembly may include a first bracket coupled to at least one region of the first housing to rotate about a virtual first rotation axis, a second bracket coupled to at least one region of the second housing to rotate about a virtual second rotation axis, a fixing bracket supporting the first bracket and the second bracket, a first shaft rotating about a third rotation axis different from the virtual first rotation axis, a second shaft adjacent to the first shaft to rotate about a fourth rotation axis different from the virtual second rotation axis, a first arm portion coupled to the first shaft to rotate about the third rotation axis, and having one side coupled to at least one region of the first bracket, a second arm portion coupled to the second shaft to rotate about the fourth rotation axis, and having one side coupled to at least one region of the second bracket, and a support portion located between the first arm portion and the second arm portion. The support portion may support at least one region of the flexible display when the electronic device is in an unfolded state, and may be spaced apart from the flexible display as the electronic device rotates from the unfolded state to a folded state.The first arm portion may include a first support rib supporting at least one region of the support portion when the electronic device is in the folded state. The second arm portion may include a second support rib supporting at least one region of the support portion when the electronic device is in the folded state.The first support rib and the second support rib may move the support portion in a direction of the flexible display, as the electronic device rotates from the folded state to the unfolded state.The electronic device may further include a first auxiliary member coupled to the first shaft to rotate about the third rotation axis, and including a third support rib, and a second auxiliary member coupled to the second shaft to rotate about the fourth rotation axis, and including a fourth support rib.The electronic device may further include a stopper having a through-hole through which a protrusion region of the support portion passes, a screw coupled to the protrusion region of the support portion, and an elastic member located between the stopper and the screw and in contact with at least one region of the stopper.The elastic member may be compressed, as the electronic device rotates from the folded state to the unfolded state.The support portion may be spaced apart from the flexible display due to restoration force of the elastic member, as the electronic device rotates from the unfolded state to the folded state.The electronic device may further include a stopper located at a lower end of the support portion and having a groove constructed in at least one region, and an elastic member located inside the groove and having one side fixed to at least one region of the support portion and another side fixed to at least one region of the stopper.The elastic member may be elongated in a direction of the flexible display as the electronic device rotates from the folded state to the unfolded state.The support portion may further include a fixing rib constructed to protrude in a lower direction of the support portion.The electronic device may include a shaft bracket supporting the first shaft and the second shaft. The fixing rib may be in contact with one region of the stopper or one region of the shaft bracket as the electronic device rotates from the folded state to the unfolded state, so that the support portion is prevented from moving by more than a specified height.The electronic device may further include a detent plate including a detent portion of a concavo-convex structure constructed to protrude in a direction of the first arm portion and second arm portion.A first cam portion corresponding to the detent portion may be constructed in one region of the first arm portion. A second cam portion corresponding to the detent portion may be constructed in one region of the second arm portion.The electronic device may further include a first gear coupled to the first shaft, a second gear coupled to the second shaft, a first idle gear engaged with the first gear, and a second idle gear engaged with the first idle gear and the second gear.A first slide hole may be constructed in one region of the first bracket corresponding to the first arm portion. A second slide hole may be constructed in one region of the second bracket corresponding to the second arm portion.The first bracket and the first arm portion may be coupled through a first fixing portion which passes through the first slide hole and one region of first arm portion. The second bracket and the second arm portion may be coupled through a second fixing portion which passes through the second slide hole and one region of second arm portion.The first fixing portion may be slid from an outer region to inner region of the first slide hole, as the electronic device rotates from the unfolded state to the folded state. The second fixing portion may be slid from the outer region to inner of the second slide hole as the electronic device rotates from the unfolded state to the folded state.According to an embodiment, a hinge assembly may include a hinge housing, and at least one hinge structure disposed inside the hinge housing. The at least one hinge structure may include a first bracket rotating about a virtual first rotation axis, a second bracket adjacent to the first bracket and rotating about a virtual second rotation axis different from the virtual first rotation axis, a fixing bracket supporting the first bracket and the second bracket, a first shaft rotating about a third rotation axis different from the virtual first rotation axis, and having a first gear coupled thereto, a second shaft adjacent to the first shaft to rotate about a fourth rotation axis different from the virtual second rotation axis, and having a second gear coupled thereto, a shaft bracket supporting the first shaft and the second shaft, a first idle gear gear-coupled with the first gear, a second idle gear gear-coupled with the first idle gear and the second gear, a first arm portion coupled to the first shaft to rotate about the third rotation axis, and having one side coupled to at least one region of the first bracket, a second arm portion coupled to the second shaft to rotate about the fourth rotation axis, and having one side coupled to at least one region of the second bracket, and a support portion moving up and down with the rotation of the first arm portion and second arm portion.The first arm portion may include a first support rib supporting at least one region of the support portion when the first arm portion and the second arm portion are in a horizontal state. The second arm portion may include a second support rib supporting at least one region of the support portion when the first arm portion and the second arm portion are in the horizontal state. The hinge assembly may further include a stopper having a through-hole through which a protrusion region of the support portion passes, a screw coupled to the protrusion region of the support portion, and an elastic member located between the stopper and the screw and in contact with at least one region of the stopper.According to an embodiment, an electronic device can reduce a size of a hinge assembly by integrating various structures for rotating a housing.According to an embodiment, an electronic device can support a flexible display even when the electronic device is in an unfolded state without affecting a driving trajectory of the flexible display.According to an embodiment, an electronic device can prevent a flexible display from being damaged in a process of using the electronic device, and can the flexible display to be more flat than traditional flexible displays.In the aforementioned specific embodiments of the present disclosure, components included in the disclosure are expressed in singular or plural forms according to the specific embodiments disclosed herein. However, the singular or plural forms (i.e., terms and/or expressions) are selected for a situation disclosed for the convenience of explanation, and thus various embodiments of the disclosure are not limited to a single or a plurality of components. Therefore, a component expressed in a plural form can also be expressed in a singular form, or vice versa.While the present disclosure has been particularly shown and described with reference to certain embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents.