Flexible Display Device Having Bending Sensing Device

Technical Field

The invention relates to a flexible display device, and more specifically, relates to a sensing device with the bending of the flexible display device, the bending sensing device is configured such that the external resistor and the bending sensor are mounted together in a flexible display device, so can reduce the output offset voltage, according to the temperature change to reduce the resistance deviation, and sensing the flexible display device the distortion (twisting).

Background Art

For processing and display a large amount of information display technology has developed rapidly. In addition, have developed various display device.

An example of the display device comprises a liquid crystal display (LCD) device, plasma display panel (PDP) device, a field emission display (FED) device and the electro-luminescence display (ELD) device. The thickness of the display device, the weight and power consumption is already reduced. However, because the display device use are subjected to the high temperature generated during the manufacturing process of the glass substrate, it is difficult to make the display device in accordance with the thin flexible way of making the above-mentioned display device.

For this reason, the use of folded or not folding of the flexible material such as plastic film to replace the conventional glass substrate of no flexibility, so that the flexible display device in accordance with the can at the same time keep the display performance like the way a paper is bent by the way of manufacturing the flexible display device has in recent years as a next-generation flat panel display device of concern. The flexible display device has the advantages of: flexible display device thin, light weight, impact-resistant and can be bent or curved so as to be folded or crimped is convenient for carrying. In addition, flexible display device can be manufactured with various forms. Therefore, can expand the flexible display device of the applicability of the future.

The flexible display device has completed the test phase, and the flexible display device of the forthcoming large-scale production. The desired flexible display device provided with conventional rigid electronic device with a display different new input and output interface, and can be also expected by the new input and output interface to updating the user experience.

In recent years, have been put forward for sensing of the flexible display device the shape of the device: the flexible display device is configured such that the plurality of bent sensor is arranged at the edge of the flexible display device, in order to detect the shape of the flexible display device (see Korean Patent application open no. 10 - 2014 - 0132569).

Figure 1 is the view of is provided with a plurality of bending sensor of conventional flexible display device view, and Figure 2 shows the conventional measurement unit of the structure. Figure 3A and Figure 3B is the block diagram of strain switching function of the view, and Figure 4 is shown a graph 2 of the detailed structure of the microprocessor.

With reference to Figure 1, for sensing the flexible display device 100 of the curvature of the bending sensor 101 and 102 in accordance with a predetermined interval along the flexible display device 100 of the arrangement of the edge.

The bending sensor 101 and 102 in each of the may be a strain gauge. The strain gauge is characterized in that: between the terminals of the resistance according to the physical stretching (extension) and compression (contraction) change. In order to use the sensor to detect the flexible display device 100 shape, must provide for signal processing of the measuring unit. The measuring unit can be as shown in Figure 2 as shown in the is realized.

A conventional measurement unit may include a bridge circuit (bridge circuit) 210, amplifier 220 and analog-to-digital converter (ADC) 230.

The bridge circuit 210 by including one or more of the strain gauge Wheatstone bridge (Wheatstone bridge) to realize. Because each of the strain gauge resistance change is very small, therefore the configuration as shown in Figure 2, the Wheatstone bridge, in order to change the resistance change is converted to a voltage, the voltage by the change of the amplifier 220 is amplified.

In addition, a Wheatstone bridge can be used as shown in Figure 3A shown in a single strain gauge for sensing a change of a quarter-bridge circuit, or as shown in Figure 3B shown for sensing a strain gauge is stretched and the other strain gauge is compressed of a pair of strain gauge changes in the half-bridge circuit. In other words, in the strain gauge are arranged in a bend sensor 101 and 102 of the position is mounted to the flexible display device 100 of the opposite surface of the case, the strain gauge can detect the tensile strain and the compressive strain. Therefore, improves the sensitivity of the sensor.

In addition, in fig. 2 of the bridge circuit 210 is configured as shown in Figure 3A quarter bridge circuit shown 320a circumstances, quarter-bridge circuit 320a can be formed by R1, R2, R3 and a strain gauge 330a form. When the power from power source 310 of the electric power is distributed to the corresponding resistor, from the bridge circuit output the amplitude of the voltage according to the strain gauge 330a of resistance change.

On the other hand, in fig. 2 of the bridge circuit 210 is configured as shown in Figure 3B indicated by the half-bridge circuit 320b of the cases, the half-bridge circuit 320b can be by R1, R3 and the two strain gauge 330b and 330c form. When the power from power source 310 of the electric power is distributed to the corresponding resistor, from the bridge circuit output the amplitude of the voltage according to the strain gauge 330b and 330c of resistance change. Based on the voltage output from the bridge circuit of the shape of the the value comes sensing flexible display device.

From the bridge circuit 210 output voltage is input into the amplifier 220, the voltage of the small value by the amplifier 220 amplifies the voltage of the value. The amplified voltage is input to the analog-to-digital converter 230. Analog-to-digital converter 230 converts analog signal into digital signal, the digital signal is output to the microprocessor 240. The microprocessor 240 based on sensed by the sensor to determine the value of the flexible display device 100 of the shape.

The microprocessor 240 of the detailed structure is shown in fig. 4 in.

That is to say, the microprocessor 240 comprises input device 401, noise filter 402, the channel compensator 403, a bending point of the detector 404, gain controller 405, bend detector 406, slope compensator 407 and a feature extractor 408.

Input device 401 from the analog-to-digital converter 230 receives the digital signal. Noise filter 402 from a meaningful signal to filter out because in addition to the flexible display device 100 of the curvature caused by factors other than the change of the sensor value.

The channel compensator 403 to set the flexible display device 100 between the sensors at the of the offset is compensated. In addition, the channel compensator 403 can be in flexible display device 100 for use in different between the sensors of the offset is compensated.

The bending point detector 404 by the along the flexible display device 100 on each side of the (namely, each edge) of the arrangement of the sensor line 101 and 102 and the sensing value (for example, voltage value) analysis, in order to draw the flexible display device 100 of each edge (i.e., each of the external region) formed at the bending point and the characteristic.

When the based on from the bent point detector 404 output value from the sensor confirming to the 101 and 102 is less than a predetermined reference value is the value of the output of the analog-to-digital converter or from the 230 of the input range, and it is therefore necessary to control amplifier 220 (for example, variable gain amplifier) when the gain, the gain controller 405 to generate an appropriate gain control signal and provided to the amplifier 220.

In addition, the bending point detector 404 from the external region 111, 112, 113 and 114 of the bending point of the detection of the relevant information is input into the bend detector 406, for use in determining the flexible display device 100 of the shape.

Slope compensator 407 based on the slope of the bending curve of information related to the curvature of the bending curve information related compensation.

Feature extractor 408 extracts the detection of the position of the bending curve, slope, angle, and the direction of the thickness, and sending them to the upper layer.

However, for sensing the curvature of the flexible display device apparatus and method has the following problem.

First of all, in the conventional flexible display device, the bending sensor attached to the surface of the flexible display device. As a result, cannot accurately detect the overall deformation of the flexible display device. In addition, cannot accurately measure the flexible display device in a layer of the stress and strain, and cannot estimate the flexible display device with time and according to the deterioration of the environment.

The reason is that: the thickness of the conventional strain gauge is about 75 μm (in the case of the commercial product), and the special adhesive has dozens of microns thickness to the strain gauge is bonded to the matrix. In the strain gauge as the thickness of the flexible display device is reduced under the condition of the same, by elasticity of the strain gauge is not the parent's elasticity is decisive, its result is not capable of accurately sensing the deformation of the matrix.

In addition, arranged in the parent strain gauge between the special adhesive with the precursor of the different elastic coefficient. In addition, in addition to elastic outside, special adhesive further has a viscosity (viscosity). Therefore, even when the parent linear deformation, by the value of the strain measuring apparatus is not linear.

Secondly, in the bridge circuit is configured to map 3A shown under the condition of one quarter of the bridge circuit, the bending sensor (strain gauge) is set up in the flexible display device at the edge of, and in addition the resistor R1, R2 and R3 formed in the circuit board. As a result, bending the sensor (strain gauge) with the other of the resistors R1, R2 and R3 of the wiring length between the generated by the difference of the offset and the tolerance.

If the signal in the presence of the offset value under the condition of being amplified, the amplified signal exceeds the input of the analog-to-digital converter margin, as a result, digitized value become saturated.

3rd, in the bridge circuit is configured to Figure 3B shown under the condition that the half-bridge circuit, two curved sensor (two strain gauge) must be in the is stretched and compressed state. In this case, will limit the design of the system.

4th, in conventional flexible display device, the bending sensor attached to the surface of the flexible display device. As a result, must be through the additional processing to form used for sending from each bend sensor output signal routing line, or the need for an additional flexible printed circuit (FPC), thus improving the production cost.

5th, in conventional flexible display device, than the remaining areas of the bending area has a high flexibility, as a result, the flexible display device can be distorted. However, in the flexible display device is the distortion of the case, a possible error to detect the bending of the flexible display device.

Content of the invention

Therefore, the invention relates to a sensing device with the bending of the flexible display device, the flexible display device substantially eliminates the associated technical limitations and defects as a result of one or more issues.

The purpose of this invention is to provide a sensing device having a curved flexible display device, the bending sensing device is configured such that the external resistor and the bending sensor are mounted together in a flexible display device, so can reduce the output offset voltage, according to the temperature change to reduce the resistance deviation, and sensing the distortion of the flexible display device.

Another advantage of the present invention, aims and features will below in the description of is partially on, and for ordinary technical personnel in this field in the case of inspection when below will partially become obvious or practice of this invention that can be gleaned from the. Can be written in the specification and claim and with photos in the structure of the specific pointed out that to realize and obtain the purpose of this invention and other advantages.

In order to achieve these objectives and other advantages, and in accordance with the purpose of the invention, as embodied in the herein described and extensive, a sensing device having a curved bending sensing device comprises: at least one bend sensor, the at least one bending sensor is installed in the when the includes a plurality of layers of said flexible display device is bent is stretched layer and/or the compressed layer in the curved region; and at least one reference resistor, the at least one reference resistor is mounted in the stretched layer and/or of the compressed layer of the non-curved in the area.

Can be compressed in a bent region of the layer is provided with a bending sensor, and can be in the compressed layer of the non-curved in the area is provided with a reference resistor. Alternatively, the layer can be stretched in the area of the bend is provided with a bending sensor, and can be stretched in the layer of the non-curved in the area is provided with a reference resistor.

By the stated one bending sensor detection signal may be output through the bridge circuit, the bridge circuit may include setting the power of the two opposite end between the 1st and 2nd of the connecting unit and the connecting unit, the connecting cells in the 1st, R1 and R3 via the 1st load connected in series to each other, the connecting cells in the 2nd, R2 and R4 are connected in series to each other via the 2nd load, the 2nd 1st connection element and the connecting element is connected in parallel to each other, and the output terminal is arranged in the 1st and the 2nd and current load, wherein the a bending sensor can be made of R1 to R4 in the form of a, and the a reference resistor can be by R1 to R4 in the with the R1 to R4 in the one adjacent another to form.

The one bending sensor can be made of R1 to form, and the one reference resistor can be by the R2 or R3 form, one of the bending sensor can be made of R2 to form, and the one reference resistor can be by R1 or R4 form, one of the bending sensor can be made of R3 to form, and the one reference resistor can be by R1 or R4 form, or one bending sensor can be made of R4 form, and the one reference resistor can be by the R2 or R3 to form.

In another example, 1st bending sensor can be installed in the compressed layer of the bending in the area, and the 1st reference resistor can be installed in the compressed layer of the non-curved in the area. In addition, the bending can be arranged in the 2nd can be stretched in the layer of the bending area, and 2nd reference resistor can be arranged in the stretched layer of the of the non-curved in the area.

The 1st bending sensor and the 2nd bend sensor can be installed in the flexible display device of the bending area in one side. Alternatively, the 1st bending sensor and the 2nd bend sensor can be installed in the flexible display device of the bending area of the opposite side in both sides.

In the 1st bending sensor and the 2nd bend sensor is mounted to a flexible display device in case of, the 2nd 1st bending sensor and the bending sensor detection signal may be output through the bridge circuit, the bridge circuit may include setting the power of the two opposite end between the 1st and 2nd of the connecting unit and the connecting unit, the connecting cells in the 1st, R1 and R3 via the 1st load connected in series to each other, the connecting cells in the 2nd, R2 and R4 are connected in series to each other via the 2nd load, the 2nd 1st connection element and the connecting element is connected in parallel to each other, and the output terminal is arranged in the 1st and the 2nd and current load, wherein the 1st bending sensor and the 2nd bend sensor can be respectively by R1 and R2 form, and the 1st 2nd reference resistor and the reference resistor can be respectively by the R3 and R4 form, the 1st bending sensor and the 2nd bend sensor can be respectively by R1 and R3 form, and the 1st 2nd reference resistor and the reference resistor can be respectively by R2 and R4 form, the 1st bending sensor and the 2nd bend sensor can be respectively by the R3 and R4 form, and the 1st 2nd reference resistor and the reference resistor can be respectively by R1 and R2 form, or the 1st bending sensor and the 2nd bend sensor can be respectively by R2 and R4 form, and the 1st 2nd reference resistor and the reference resistor can be respectively by R1 and R3 form.

In another example, the two bend sensor can be installed in the compressed layer of the bending in the area, and the two reference resistor can be installed in the compressed layer of the non-curved in the area, or, two curved sensor can be arranged in the stretched layer of the stated in a bent region, and two reference resistor can be arranged in the stretched layer of the of the non-curved in the area.

In the two bending sensor is installed in the flexible display device in the case of the, by the two curved sensor detection signal may be output through the bridge circuit, the bridge circuit may include setting the power of the two opposite end between the 1st and 2nd of the connecting unit and the connecting unit, the connecting cells in the 1st, R1 and R3 via the 1st load connected in series to each other, the connecting cells in the 2nd, R2 and R4 are connected in series to each other via the 2nd load, the 2nd 1st connection element and the connecting element is connected in parallel to each other, and the output terminal is arranged in the 1st and the 2nd and current load, wherein the two bending sensor can be made of R1 and R4 form, and the two reference resistor can be by R2 and R3 form, or, the two bending sensor can be made of R2 and R3 form, and the two reference resistor can be by R1 and R4 form.

In this another aspect of the invention, a sensing device with the bending of the flexible display device comprises: at least one bend sensor, the at least one bending sensor in accordance with the so that the at least one bending sensor to the flexible display device in a manner to inclined installation in the flexible display device in the curved region; and at least one reference resistor, the at least one reference resistor in accordance with the so that the at least one reference resistor with said flexible display device to be parallel or vertical way is mounted on the flexible display device of the non-curved in the area.

The at least one bending sensor may include a bend sensor 1st and 2nd bend sensor, the sensor and the 2nd 1st bending the bending sensor is arranged in one side of the curved region, and said at least one reference resistor can include 1st 2nd reference resistor and the reference resistor, the reference resistor and the 1st 2nd reference resistor is mounted in the non-curved area in one side.

The at least one bending sensor may include a bend sensor 1st and 2nd bend sensor, the 1st bending sensor is installed in the bending area in one side, and the 2nd bending sensor is mounted in said bending zone in the other side, and said at least one reference resistor can include 1st 2nd reference resistor and the reference resistor, the 1st reference resistor is mounted in the non-curved region in the one side of the, and the 2nd reference resistor is mounted in the non-curved region in the other side.

The 1st and the 2nd bend sensor can be in accordance with the bend sensor so that the sensor and the 2nd 1st bending the bending sensor in the opposite direction in a manner to slope in the installation in a bent region.

To understand is, in front of the of the present invention brief description and the following detailed description of the two is illustrative and illustrative, and are designed to provide protection to the further description of the present invention.

Description of drawings

Figure is included to provide a further understanding of the present invention, and are incorporated into this specification in and form a part of this specification, with photos instantiates the embodiments of the present invention, and together with the description used for explaining the principle of the invention. In the attached drawing:

Figure 1 is the view of the bending sensor is provided with a plurality of conventional flexible display device;

Figure 2 is the view of the structure of the conventional measuring unit;

Figure 3A and Figure 3B is the view of the view of the strain switching function, wherein Figure 3A is the view, whereas Figure of has shown the quarter-bridge circuit 3B is shown a half-bridge circuit;

Figure 4 is the block diagram of Figure 2 of the detailed structure of the microprocessor;

Figure 5 is the view of instantiating the sensing according to the invention the curvature of the flexible display device of the principle;

Figure 6 is the view of instantiating the bending sensors and the reference resistor is mounted according to the present invention the flexible display device of one side of the curved region of the or each side of the situation;

Figure 7A is the view of the example the installation according to the invention the bending of the flexible display device in view of the sensor and a reference resistor, and Figure 7B is instantiated according to the present invention bending sensors and the reference resistor is mounted in the flexible display device in position;

Figure 8 is the view of instantiated according to the present invention the bending of the flexible display device in the area of the relationship between the tensile and compressive;

Figure 9A is the view of according to the invention of the 1st embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 1st embodiment of the structure;

Figure 9B is the view of according to the invention of the 1st embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 2nd embodiment of the structure;

Figure 10A is the view of according to the invention of the 2nd embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 3rd embodiment of the structure;

Figure 10B is the view of according to the invention of the 2nd embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 4th embodiment of the structure;

Figure 10C is the view of according to the invention of the 2nd embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 5th embodiment of the structure;

Figure 10D is the view of according to the invention of the 2nd embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 6th embodiment of the structure;

Figure 11 is the view of instantiated according to the 3rd embodiment of the present invention with the bending of the flexible display device of the sensing device;

Figure 12A is the view of according to the invention of the 3rd embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 7th embodiment of the structure;

Figure 12B is the view of according to the invention of the 3rd embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 8th embodiment of the structure;

Figure 13A and Figure 13B is the view, and Figure 13B is the view of instantiating the normal bending of the curved region of the 90 degrees of the view, wherein Figure 13A is instantiated according to the present invention embodiment of the 2nd or 3rd embodiment of the sensing device with the bending of the flexible display device of when the bending sensor is installed in the generating tensile strain and bending of the curved region of the hits the mark when bending the sensor state and when the bending sensor is installed in generating the tensile strain and the curved region of the normal bending of the bending sensor of the state of the hits the mark when;

Figure 14A and Figure 14B is the view, and Figure 14B is the view of instantiating the flexible display device distorted view, wherein Figure 14A is instantiated according to the present invention embodiment of the 2nd or 3rd embodiment of the sensing device with the bending of the flexible display device distortions of when the bending sensor is installed in the generating tensile strain and bending of the curved region of the hits the mark when bending the sensor state and when the bending sensor is installed in the generating tensile strain and distortion of the curved region of the hits the mark when bending sensor of the state of the;

Figure 15A and Figure 15B is the view, and Figure 15B is the view of instantiated according to the 4th embodiment of the present invention sensor in the bending of the bending sensor is fitted to the tip of the bending of the flexible display device in the area and the curved region of the normal bending when the change of the length and width of the view of the, wherein Figure 15A is instantiated the bending sensor is fitted to the tip of the bending of the flexible display device in the area of the situation of when the bending sensor is fitted to the tip of the bending in the area and without a bending of the curved region of the sensor and when the state of the bending when the bending sensor is fitted to the tip of the curved region of the bend in the area and not twisted but normal bending state of the bending sensor;

Figure 16A and Figure 16B is the view, and Figure 16B is the view of instantiated according to the 4th embodiment of the present invention sensor in the bending of the bending sensor is fitted to the tip of the bending of the flexible display device in the area of the distortion and the curved region of the length and the width of the change of the view, wherein Figure 16A is instantiated the bending sensor is fitted to the tip of the bending of the flexible display device in the area of the situation of when in the curved region of the 1st bending sensor R1 on the tilted direction of the distortion of the 1st bending sensor when R1 and when the state of the bending region in the 1st bending sensor R1 on the tilted direction of distortion when the bend sensor 2nd R3 of the state of the;

Figure 17 is the floorplan of according to the 2nd embodiment of the present invention or the 3rd embodiment of the sensing device which is provided with a bending of the flexible display device bends in the sensor and a reference resistor; and

Figure 18 is the floorplan of according to the present invention installed in the 4th embodiment of the sensing device with the bending of the bending of the flexible display device in the sensor and the reference resistor.

Mode of execution

Reference will now be in detail to the preferred embodiment of the present invention, in the attached drawing illustration of the invention is the preferred embodiment of the example.

Figure 5 is the view of instantiating the sensing according to the invention the curvature of the flexible display device the theory of the view, and Figure 6 is instantiated the bending sensor installation according to the invention the flexible display device of the bending zone on one side or on each side of the situation.

As shown in Figure 5, when the flexible display device is bent, the bending point of the display device of the stress and strain on the σ ε. The stress is proportional to strain ε σ with each other. When the flexible display device is bent, the thickness of the bending point of the t, the width L and the length of the w change based on strain ε.

When the flexible display device is stretched, a bending point of the width of the reduced t w and thickness, and the length of the cusp L increase, therefore the resistance increases. When the flexible display device is compressed, and the width of the bending point of the w t increase the thickness, and the length of the cusp L is reduced, so the resistance is decreased.

According to the present invention with the bending of the sensing device in the flexible display device, as shown in Figure 6, BS two bending sensor is mounted in the flexible display device of each of the curved region of the in one side, and two reference resistor RR is mounted in the flexible display device of each of the non-bending area in one side.

Figure 7A is the view of the example the installation according to the invention the bending of the flexible display device in view of the sensor and a reference resistor, and Figure 7B is instantiated according to the present invention bending sensors and the reference resistor is mounted in the flexible display device in position.

As shown in Figure 7A shown, according to the invention the bending sensor BS and reference resistor RR with resistance by made of conducting material, and have the same shape. Therefore, the bend sensor BS and reference resistor RR is formed to have the same resistance. However, because of the bending sensor BS in formed in the bending area, so the resistance value of the bending sensor BS according to the degree of bending (bending angle) change, and because the reference resistor RR to form a non-curved in the area, so the resistance value of the reference resistor RR is not changed.

In addition, as shown in Figure 7B shown, according to the present invention comprises a flexible display device such as a back plate layer (Back plate), pixel array layer (TFT + Encap), touch sensor layer (Touch) and the concave (Cover + Pol) such a plurality of film (layer).

Because the flexible display device comprises a plurality of membrane, therefore in the curved region of the some of the film (layer) is stretched, and the bending in the area of some film (layer) is compressed. As noted above, because in the curved region of the some of the film (layer) is stretched, and the bending in the area of some film (layer) is compressed, thereby curving the sensor BS and reference resistor RR is mounted in Figure 7B shown in the pixel array layer (TFT + Encap), touch sensor layer (Touch) and the concave (Cover + Pol) in a selected one of the.

The bending sensor BS and reference resistor RR can be formed in a layer different from the. Alternatively, bending the sensor BS and reference resistor RR must have the same resistance value, thereby curving the sensor BS and reference resistor RR can be formed in a same layer. However, in any case, the bend sensor formed in the BS in a bent region, and the reference resistor RR is formed in the non-curved in the area.

Figure 8 is the view of instantiated according to the present invention the bending of the flexible display device in the area of the relationship between the tensile and compression.

As mentioned above, the flexible display device includes a plurality of film (layer). In particular, as shown in Figure 8, flexible display device includes four film U1, U2, U3 and U4. Therefore, when the flexible display device is bent, the bending area in the depth direction of the tensile strain on the depth and compressive strain depth are different from each other.

[According to the 1st embodiment has a curved sensing device of the flexible display device]

With reference to Figure 8, when the flexible display device towards the 1st film U1 is bent, 3rd film U3 is compressed, the 2nd film U2 is stretched.

Therefore, according to the present invention with the bending of the 1st embodiment of the sensing device in the flexible display device, in fig. 6 shown in one side of the curved region of the installed in a bending sensor (strain gauge), and in non-bending area in one side mounting at least one reference resistor RR. In this case, the bending sensor BS and reference resistor RR can be installed in such as with reference to Figure 8 the compressed 3rd film U3 in, or can be installed in such as with reference to Figure 8 of the stretched film 2nd U2 in.

Figure 9A is the view of according to the invention of the 1st embodiment of the sensing device with the bending of the flexible display device of a bridge circuit of the 1st embodiment of the view of the structure, and Figure 9B is shown according to the present invention 1st embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 2nd embodiment of the structure.

As shown in Figure 9A shown, according to the present invention with the bending of the 1st embodiment of the sensing device in the flexible display device, the bridge circuit of the 1st embodiment comprises a bend sensor (strain gauge) R1 and three reference resistor R2, R3 and R4. The reference resistor R2 in accordance with the bending sensor in the same manner as with the installation of the flexible display device. However, the invention is not limited to this. The reference resistor R3 and R4 can also be arranged in the flexible display device.

In other words, such as with reference to Figure 8 the, bending sensor R1 is installed in the compressed 3rd film U3 or be stretched film 2nd U2 in the curved region, and the reference resistor R2 is installed in the compressed 3rd film U3 or be stretched film 2nd U2 of the non-curved in the area.

In other words, comprises a power supply opposite to that of the in between the two ends of the connecting unit and the 1st and 2nd connecting unit including the bridge circuit is characterized in that: the bending of the sensor by the R1 form, and install in the compressed 3rd film U3 or be stretched film 2nd U2 of the non-curved in the area of the by the reference resistor R2 form, wherein the 1st connecting cells, R1 and R3 via the 1st load connected in series to each other, the connecting cells in the 2nd, R2 and R4 are connected in series to each other via the 2nd load, 2nd 1st connection unit and the connecting element is connected in parallel to each other, and output terminal A and B are respectively formed in the 1st and 2nd and current load.

In the bridge circuit as shown in Figure 9A pursue to is a situation, terminal A and terminal B V between the magnitude of the_AB As follows.

[Formula 1]

V_AB =[R3/(R1 + R3) - R4/(R2 + R4)] xVs

R1 is used for sensing the tensile strain or compressive strain of the bending sensor. Therefore, when the flexible display device is bent, R1 of the change of electric resistance. However, because the R2 formed in the non-curved in the area, so that when the flexible display device is bent, R2 of the resistor does not change. Bending the sensor R1 and the reference resistor R2 is mounted to a flexible display device, therefore bending sensor R1 and the reference resistor R2 can have the same tolerance range. In addition, can reduce the output offset voltage value, and can be reduced depends on the temperature change of resistance deviation.

In addition, as shown in Figure 9B shown, according to the present invention with the bending of the 1st embodiment of the sensing device in the flexible display device, the bridge circuit of the 2nd embodiment comprises a bend sensor (strain gauge) R1 and three reference resistor R2, R3 and R4. The reference resistor R3 in accordance with the bending sensor mounted in the same manner as in the flexible display device. However, the invention is not limited to this. The reference resistor R2 and R4 can also be arranged in the flexible display device.

In other words, such as with reference to Figure 8 the, bending sensor R1 is installed in the compressed 3rd film U3 or be stretched film 2nd U2 in the curved region, and the reference resistor R3 is installed in the compressed 3rd film U3 or be stretched film 2nd U2 of the non-curved in the area.

In other words, comprises a power supply opposite to that of the in between the two ends of the connecting unit and the 1st and 2nd connecting unit including the bridge circuit is characterized in that: the bending of the sensor by the R1 form, and install in the compressed 3rd film U3 or be stretched film 2nd U2 of the non-curved in the region of the reference resistor is composed of R3 form, wherein the 1st connecting cells, R1 and R3 via the 1st load connected in series to each other, the connecting cells in the 2nd, R2 and R4 are connected in series to each other via the 2nd load, 2nd 1st connection unit and the connecting element is connected in parallel to each other, and output terminal A and B are respectively formed in the 1st and 2nd and current load.

In the bridge circuit as shown in Figure 9B pursue to is a situation, terminal A and terminal B V between the magnitude of the_AB Is expressed as [formula 1].

V_AB =[R3/(R1 + R3) - R4/(R2 + R4)] xVs

R1 is used for sensing the tensile strain or compressive strain of the bending sensor. Therefore, when the flexible display device is bent, R1 of the change of electric resistance. However, because the R3 is formed in the non-curved in the area, so that when the flexible display device is bent, R3 of the resistor does not change. Bending the sensor R1 and the reference resistor R3 is mounted to a flexible display device, therefore bending sensor R1 and the reference resistor R3 can have the same tolerance range. In addition, can reduce the output offset voltage value, and can be reduced depends on the temperature change of resistance deviation.

Although not shown, but in the embodiment of the bridge circuit of the 1st or 2nd embodiment, bending sensor can be made of R2 to form, and the reference resistor can be by R1 or R4 form. Alternatively, the bending sensor can be made of R3 to form, and the reference resistor can be by R1 or R4 form. Alternatively, the bending sensor can be made of R4 to form, and the reference resistor can be by the R2 or R3 to form.

In other words, in the bridge circuit of the embodiment of the 1st or 2nd embodiment, bending sensor can be made of R1 to R4 in the form of a, and the reference resistor can be formed by the bending sensor adjacent to the resistor.

[According to the 2nd embodiment with bending sensing device of the flexible display device]

According to the 2nd embodiment of the sensing device with the bending of the flexible display device is configured such that the two bending sensor (strain gauge) is installed in one side of the flexible display device in the curved region, and two reference resistor is mounted in one side of the flexible display device of the non-curved in the area, or such that one of the bending sensor (strain gauge) is mounted to a flexible display device on each side of in the curved region of the, and a reference resistor is mounted in the flexible display device on each side of the non-curved in the area.

In this case, with reference to Figure 8 described, a bending sensor is installed in the compressed 3rd film U3 in, and the other bending sensor is installed on the stretching of the film 2nd U2 in.

Figure 10A is the view of according to the invention of the 2nd embodiment of the sensing device with the bending of the flexible display device of the 3rd embodiment of the bridge circuit of the view of the structure, Figure 10B is the view, and Figure of has been shown according to the invention of the 2nd embodiment of the sensing device with the bending of the flexible display device of a bridge circuit of the 4th embodiment of the view of the structure, Figure 10C is shown according to the present invention of the 2nd embodiment of the sensing device with the bending of the flexible display device of the bridge circuit structure of the 5th embodiment 10D is shown according to the present invention of the 2nd embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 6th embodiment of the structure.

As shown in Figure 10A shown, according to the 2nd embodiment of the sensing device with the bending of the flexible display device, the bridge circuit of the 3rd embodiment comprises two curved sensor (strain gauge) R1 and R2 and two reference resistor R3 and R4. In other words, installation such as with reference to Figure 8 the compressed 3rd film U3 a bending of sensor (strain gauge) and Figure 10A shown in R2 corresponding, installed on the stretched film 2nd of U2 and the other in a bending sensor (strain gauge) and Figure 10A shown in R1 to should be.

In other words, comprises a power supply opposite to that of the in between the two ends of the connecting unit and the 1st and 2nd connecting unit including the bridge circuit is characterized in that: is installed on the stretching of the film 2nd U2 in a bending sensor (strain gauge) by R1 form, and install in the compressed 3rd film U3 in the other of a bending sensor (strain gauge) by the R2 form, wherein the 1st connecting cells, R1 and R3 are connected in series to each other via the 1st load, in the 2nd connecting cells, R2 and R4 are connected in series to each other via the load 2nd, 2nd 1st connection unit and the connecting element is connected in parallel to each other, and output terminal A and B are respectively formed in the 1st and 2nd and current load. In addition, installation in the compressed 3rd film U3 and is stretched 2nd film U2 of the non-curved in the region of the respectively by the reference resistor R3 and R4 form.

In the bridge circuit as shown in Figure 10A pursue to is a situation, terminal A and terminal B V between the magnitude of the_AB Is expressed as [formula 1].

V_AB =[R3/(R1 + R3) - R4/(R2 + R4)] xVs

R1 is used for sensing the tensile strain of the bending sensor, and therefore R1 of the increase of the electric resistance. R2 is used for sensing the compression strain of the bending sensor, and therefore R2 reduces the resistance. Therefore, according to the invention of the bridge circuit output voltage is equal to the Figure 3A shown in the conventional bridge circuit of the output voltage of the two times.

In addition, because of the bending sensor R1 and R2 and the reference resistor R3 and R4 is mounted to a flexible display device, therefore bending sensor R1 and R2 and the reference resistor R3 and R4 can have the same tolerance range. In addition, can reduce the output offset voltage value, and can be reduced depends on the temperature change of resistance deviation.

In fig. 10A in the of the bridge circuit, is installed in the compressed 3rd film U3 a bending of sensor (strain gauge) can be formed by R1 form, and is installed on the stretching of the film 2nd U2 in another bend sensor (strain gauge) can be by the R2 form.

In addition, as shown in Figure 10B shown, according to the present invention with the bending of the 2nd embodiment of the sensing device in the flexible display device, the bridge circuit of the 4th embodiment comprises two curved sensor (strain gauge) R1 and R3 and two reference resistor R2 and R4. In other words, installation such as with reference to Figure 8 the compressed 3rd film U3 a bending of sensor (strain gauge) and Figure 10B shown in R1 corresponding, and install in the stretched film 2nd of U2 and the other in a bending sensor (strain gauge) and Figure 10B shown in the R3 to should be.

In other words, comprises a power supply opposite to that of the in between the two ends of the connecting unit and the 1st and 2nd connecting unit including the bridge circuit is characterized in that: installed in the compressed 3rd film U3 a bending of sensor (strain gauge) by R1 form, and is installed on the stretching of the film 2nd U2 in another bend sensor (strain gauge) by the R3 form, wherein the 1st connecting cells, R1 and R3 are connected in series to each other via the 1st load, in the 2nd connecting cells, R2 and R4 are connected in series to each other via the load 2nd, 2nd 1st connection unit and the connecting element is connected in parallel to each other, and output terminal A and B are respectively formed in the 1st and 2nd and current load. In addition, installation in the compressed 3rd film U3 and is stretched 2nd film U2 of the non-curved in the region of the respectively by reference resistor R2 and R4 form.

In the bridge circuit as shown in Figure 10B pursue to is a situation, terminal A and terminal B V between the magnitude of the_AB Is expressed as [formula 1]. R3 is used for sensing the tensile strain of the bending sensor, and therefore R3 of the increase of the electric resistance. R1 is used for sensing the compression strain of the bending sensor, and therefore R1 reduces the resistance. Therefore, according to the invention of the bridge circuit output voltage is equal to the Figure 3A shown in the conventional bridge circuit of the output voltage of the two times.

In addition, because of the bending sensor R1 and R3 and the reference resistor R2 and R4 is mounted to a flexible display device, therefore bending sensor R1 and R3 and the reference resistor R2 and R4 can have the same tolerance range. In addition, can reduce the output offset voltage value, and can be reduced depends on the temperature change of resistance deviation.

In fig. 10B in the of the bridge circuit, is installed in the compressed 3rd film U3 a bending of sensor (strain gauge) can be by the R3 form, and is installed on the stretching of the film 2nd U2 in another bend sensor (strain gauge) can be formed by R1 form.

In addition, as shown in Figure 10C shown, according to the present invention with the bending of the 2nd embodiment of the sensing device in the flexible display device, the bridge circuit of the 5th embodiment includes two curved sensor (strain gauge) R3 and R4 and two reference resistor R1 and R2. In other words, installation such as with reference to Figure 8 the compressed 3rd film U3 a bending of sensor (strain gauge) and Figure 10C shown in the R3 corresponding to, and is installed on the stretching of the film 2nd U2 in another bend sensor (strain gauge) and Figure 10C shown in the R4 to should be.

In other words, comprises a power supply opposite to that of the in between the two ends of the connecting unit and the 1st and 2nd connecting unit including the bridge circuit is characterized in that: installed in the compressed 3rd film U3 a bending of sensor (strain gauge) by the R3 form, and is installed on the stretching of the film 2nd U2 in another bend sensor (strain gauge) by the R4 form, wherein the 1st connecting cells, R1 and R3 are connected in series to each other via the 1st load, in the 2nd connecting cells, R2 and R4 are connected in series to each other via the load 2nd, 2nd 1st connection unit and the connecting element is connected in parallel to each other, and output terminal A and B are respectively formed in the 1st and 2nd and current load. In addition, installation in the compressed 3rd film U3 and is stretched 2nd film U2 of the non-curved in the region of the respectively by the reference resistor R1 and R2 form.

In the bridge circuit as shown in Figure 10C pursue to is a situation, terminal A and terminal B V between the magnitude of the_AB Is expressed as [formula 1]. R3 is used for sensing the compression strain of the bending sensor, and therefore R3 reduces the resistance. R4 is used for sensing the tensile strain of the bending sensor, and therefore R4 of the resistance increases. Therefore, according to the invention of the bridge circuit output voltage is equal to the Figure 3A shown in the conventional bridge circuit of the output voltage of the two times.

In addition, because of the bending sensor R3 and R4 and the reference resistor R1 and R2 is mounted to a flexible display device, therefore bending sensor R3 and R4 and the reference resistor R1 and R2 can have the same tolerance range. In addition, can reduce the output offset voltage value, and can be reduced depends on the temperature change of resistance deviation.

In fig. 10C in of the bridge circuit, is installed in the compressed 3rd film U3 a bending of sensor (strain gauge) can be formed by R4 form, and is installed on the stretching of the film 2nd U2 in another bend sensor (strain gauge) can be by the R3 form.

In addition, as shown in Figure 10D shown, according to the present invention with the bending of the 2nd embodiment of the sensing device in the flexible display device, the bridge circuit of the 6th embodiment includes two curved sensor (strain gauge) R2 and R4 and two reference resistor R1 and R3. In other words, installation such as with reference to Figure 8 the compressed 3rd film U3 a bending of sensor (strain gauge) and Figure 10D shown in R2 corresponding, and install in the stretched film 2nd of U2 and the other in a bending sensor (strain gauge) and Figure 10D shown in the R4 to should be.

In other words, comprises a power supply opposite to that of the in between the two ends of the connecting unit and the 1st and 2nd connecting unit including the bridge circuit is characterized in that: installed in the compressed 3rd film U3 a bending of sensor (strain gauge) by the R2 form, and is installed on the stretching of the film 2nd U2 in another bend sensor (strain gauge) by the R4 form, wherein the 1st connecting cells, R1 and R3 are connected in series to each other via the 1st load, in the 2nd connecting cells, R2 and R4 are connected in series to each other via the load 2nd, 2nd 1st connection unit and the connecting element is connected in parallel to each other, and output terminal A and B are respectively formed in the 1st and 2nd and current load. In addition, installation in the compressed 3rd film U3 and is stretched 2nd film U2 of the non-curved in the region of the respectively by the reference resistor R1 and R3 form.

In the bridge circuit as shown in Figure 10D pursue to is a situation, terminal A and terminal B V between the magnitude of the_AB Is expressed as [formula 1]. R2 is used for sensing the compression strain of the bending sensor, and therefore R2 reduces the resistance. R4 is used for sensing the tensile strain of the bending sensor, and therefore R4 of the resistance increases. Therefore, according to the invention of the bridge circuit output voltage is equal to the Figure 3A shown in the conventional bridge circuit of the output voltage of the two times.

In addition, because of the bending sensor R2 and R4 and the reference resistor R1 and R3 is mounted to a flexible display device, therefore bending sensor R2 and R4 and the reference resistor R1 and R3 can have the same tolerance range. In addition, can reduce the output offset voltage value, and can be reduced depends on the temperature change of resistance deviation.

In fig. 10D in the of the bridge circuit, is installed in the compressed 3rd film U3 a bending of sensor (strain gauge) can be formed by R4 form, and is installed on the stretching of the film 2nd U2 in another bend sensor (strain gauge) can be by the R2 form.

[According to the 3rd embodiment with bending sensing device of the flexible display device]

Figure 11 is the view, and Figure of instantiated according to the 3rd embodiment of the present invention with the bending of the sensing device the view of the flexible display device, Figure 12A is the view of according to the invention of the 3rd embodiment of the sensing device with the bending of the flexible display device of the bridge circuit structure of the 7th embodiment 12B is shown according to the present invention of the 3rd embodiment of the sensing device with the bending of the flexible display device of the bridge circuit of the 8th embodiment of the structure.

As shown in Figure 11, according to the 3rd embodiment of the present invention with the bending of the sensing device in the flexible display device, two bending sensor is installed in the compressed 3rd film U3 in the curved region, and two reference resistor is mounted in the compressed 3rd film U3 of the non-curved in the area. Alternatively, two curved sensor can be arranged in the stretched film of the 2nd U2 in the curved region, and two reference resistor can be arranged in the stretched film of the 2nd U2 of the non-curved in the area.

Figure 11 shows two bending sensor is installed in the compressed 3rd film U3 in the curved region of the situation. Although Figure 11 not shown in the drawings, but the two bending sensor can be arranged in the stretched film of the 2nd U2 in the curved region.

As shown in Figure 12A is shown, according to the present invention with the bending of the 3rd embodiment of the sensing device in the flexible display device, the bridge circuit of the 7th embodiment includes two curved sensor (strain gauge) R1 and R4 and two reference resistor R2 and R3.

Installation such as with reference to Figure 11 of the stretched film 2nd U2 in the curved region of the two bending sensor (strain gauge) or mounting such as with reference to Figure 11 the compressed 3rd film U3 in the curved region of the two bending sensor (strain gauge) and Figure 12A shown in R1 and R4 corresponding to the, and is installed on the stretching of the film 2nd U2 of the non-curved in the region of the two reference resistor or installed in the compressed 3rd film U3 of the non-curved in the area of the two reference resistor with the Figure 12A shown in R2 and R3 to the should be.

In other words, comprises a power supply opposite to that of the in between the two ends of the connecting unit and the 1st and 2nd connecting unit including the bridge circuit is characterized in that: installed in the compressed 3rd film U3 in the curved region of the two bending sensor (strain gauge) can be stretched or installed in the 2nd film U2 in the curved region of the two bending sensor (strain gauge) by R1 and R4 form, wherein the 1st connecting cells, R1 and R3 are connected in series to each other via the 1st load, in the 2nd connecting cells, R2 and R4 are connected in series to each other via the load 2nd, 2nd 1st connection unit and the connecting element is connected in parallel to each other, and output terminal A and B are respectively formed in the 1st and 2nd and current load.

In the bridge circuit as shown in Figure 12A pursue to is under the condition that the configuration, as mentioned above, according to the invention of the bridge circuit output voltage is equal to the Figure 3A shown in the conventional bridge circuit of the output voltage of the two times. In addition, the bending sensors and the reference resistor can have the same tolerance range. In addition, can reduce the output offset voltage value, and can be reduced depends on the temperature change of resistance deviation.

In addition, as shown in Figure 12B shown, according to the present invention with the bending of the 3rd embodiment of the sensing device in the flexible display device, the bridge circuit of the 8th embodiment includes two curved sensor (strain gauge) R2 and R3 and two reference resistor R1 and R4.

Installation such as with reference to Figure 11 of the stretched film 2nd U2 in the curved region of the two bending sensor (strain gauge) or installed in the compressed 3rd film U3 in the curved region of the two bending sensor (strain gauge) and Figure 12B shown in R2 and R3 corresponding to, and is installed on the stretching of the film 2nd U2 of the non-curved in the region of the two reference resistor or installed in the compressed 3rd film U3 of the non-curved in the area of the two reference resistor with the Figure 12B shown in R1 and R4 to should be.

In other words, comprises a power supply opposite to that of the in between the two ends of the connecting unit and the 1st and 2nd connecting unit including the bridge circuit is characterized in that: installed in the compressed 3rd film U3 in the curved region of the two bending sensor (strain gauge) can be stretched or installed in the 2nd film U2 in the curved region of the two bending sensor (strain gauge) by R2 and R3 form, wherein the 1st connecting cells, R1 and R3 are connected in series to each other via the 1st load, in the 2nd connecting cells, R2 and R4 are connected in series to each other via the load 2nd, 2nd 1st connection unit and the connecting element is connected in parallel to each other, and output terminal A and B are respectively formed in the 1st and 2nd and current load.

In the bridge circuit as shown in Figure 12B pursue to is under the condition that the configuration, as mentioned above, according to the invention of the bridge circuit output voltage is equal to the Figure 3A shown in the conventional bridge circuit of the output voltage of the two times. In addition, the bending sensors and the reference resistor can have the same tolerance range. In addition, can reduce the output offset voltage value, and can be reduced depends on the temperature change of resistance deviation.

In the invention of each of the above embodiments, the bend sensor and is used for outputting by a bend sensor of the signal detected in the route line can be formed by mounting the bend sensor film (layer) of use in the treatment of conductive material form.

For example, it is assumed that the compressed film (layer) is pixel array layer (TFT + Encap) and is stretched film (layer) is a touch sensor layer (Touch), bend sensor and routing line can be used for forming a gate electrode of a transistor of the pixel array, data electrodes, scanning line and the data line is formed of a material, or bending of the sensor and routing line can be used for forming the for sensing the X axis of the electrode and Y shaft electrode and formed of a material the routing line.

According to the present invention experimental result is shown in the reference resistor is set up as shown in Figure 3A shown in the case of the plate circuit, the output voltage has the - 0.123 mV to 0.135mV offset, in the reference resistor is mounted according to the present invention under the condition of the flexible display device, the output voltage has the - 0.004 mV to 0.004mV offset. Therefore, we can see, according to the present invention the offset of the output voltage according to the conventional technology to the output voltage of the offset of about 97%.

However, in fig. 7 shown in the bending sensor is installed according to the present invention each of the above embodiment of the sensing device with the bending of the curved region of the flexible display device in a situation that, if the bending area not bending but twisted, may not be able to accurately measure the bending angle.

[According to the 4th embodiment with bending sensing device of the flexible display device]

Figure 13A and Figure 13B is the view, and Figure 13B is the view of instantiating the normal bending of the curved region of the 90 degrees of the view, wherein Figure 13A is instantiated according to the present invention embodiment of the 2nd or 3rd embodiment of the sensing device with the bending of the flexible display device of when the bending sensor is installed in the generating tensile strain and bending of the curved region of the hits the mark when bending the sensor state and when the bending sensor is installed in generating the tensile strain and the curved region of the normal bending of the bending sensor of the state of the hits the mark when.

In other words, such as according to the 2nd embodiment of the present invention or the 3rd embodiment of the bending in the sensing device described, two curved sensor (strain gauge) can be in accordance with the make the bending sensor with the flexible display device is vertically installed on the flexible display device in the curved region, and two reference resistor can be arranged in the flexible display device on one side of the non-curved in the area. Alternatively, a bending sensor (strain gauge) can be in accordance with the make the bending sensor with the flexible display device is vertically installed on the flexible display device on each side of in the curved region, and a reference resistor can be arranged in the flexible display device on each side of the non-curved in the area.

In fig. 13A in, two curved sensor (strain gauge) by R1 and R3 expressed, and by two reference resistor R2 and R4 expressed.

When the flexible display device without the curved region of the bend, the bend sensor R1 or R3 having Image 13B shown in the length L, the width W and the thickness t. When the flexible display device the curved region of the bend, the bend sensor R1 or R3 having Image 13B shown in L'of the length, width W 'and the thickness of the t'. In other words, when the bending sensor as mentioned above the ground cover is mounted in generating the tensile strain and the flexible display device of bending of the bending area when they are mentioned, bending sensor R1 or R3 L increased the length of (L _ AOE 28692X0AO _ L'), and the bending sensor R1 or R3 and the thickness of the width (W _ AOE 28692X0AO _ W' and t _ AOE 28692X0AO _ t'), therefore the resistance increases.

As mentioned above, when the bending region is bent, the bending sensor R1 or R3 L'of the length, width W ' and the thickness of the t'use with reference to Figure 5 of illustration characteristic is expressed as follows.

[Formula 2]

L'=Lx (1 + ε)

W '=Wx (1 - νx ε), ν=0.334

T'=tx (1 - νx ε)

R '=ρxL'/(W 'xt')

The type 2, taking into account the length L and the L', width W and W' and thickness t and t'to calculate strain ε and resistance change (R - R')/R.

In the strain ε is 1% (0.01) and the bending sensor R1 and R3 in each of the change of resistance is 1.68% (0.0168) under the condition of, identifying to the flexible display device the curved region of the bent about 90 degrees.

Even in the curved region of the flexible display device is not the normal bending under the condition is twisted, strain and bending sensor R1 and R3 in each of the one resistance change is changed.

Figure 14A and Figure 14B is the view, and Figure 14B is the view of instantiating the flexible display device distorted view, wherein Figure 14A is instantiated according to the present invention embodiment of the 2nd or 3rd embodiment of the sensing device with the bending of the flexible display device distortions of when the bending sensor is installed in the generating tensile strain and bending of the curved region of the hits the mark when bending the sensor state and when the bending sensor is installed in the generating tensile strain and distortion of the curved region of the hits the mark when of the state of the bending sensor.

In other words, when the flexible display device when the curved region of the distorted, as shown in Figure 14A shown, bending sensor R1 or R3 L increased the length of (L _ AOE 28692X0AO _ L'), and as shown in Figure 14B shown, bending sensor R1 or R3 and the thickness of the width (W _ AOE 28692X0AO _ W' and t _ AOE 28692X0AO _ t'), therefore the resistance increases.

As mentioned above, when the flexible display device when the curved region of the distorted, strain and bending sensor R1 and R3 in each of a plurality of resistance variation according to type 2 as indicated by the calculated. In the strain ε is 0.5% (0.005) and the bending sensor R1 and R3 in each of the resistance change is 0.84% (0.0084) under the condition of, identifying to the flexible display device the curved region of the bend about 45 degrees.

As mentioned above, when the flexible display device is not the curved region of the normal bending when is twisted, could not determine the curved region of the flexible display device is normal bending also is twisted.

Therefore, in the flexible display device in the curved region of the fitted to the tip of the bend sensor, can detect the flexible display device of the distortion of the bending region.

Figure 15A and Figure 15B is the view, and Figure 15B is the view of instantiated according to the 4th embodiment of the present invention sensor in the bending of the bending sensor is fitted to the tip of the bending of the flexible display device in the area and the curved region of the normal bending when the change of the length and width of the view of the, wherein Figure 15A is instantiated the bending sensor is fitted to the tip of the bending of the flexible display device in the area of the situation of when the bending sensor is fitted to the tip of the bending in the area and without a bending of the curved region of the sensor and when the state of the bending when the bending sensor is fitted to the tip of the curved region of the bend in the area and not twisted but normal bending state of the bending sensor.

As shown in Figure 15A shown, in each of the flexible display device in a bent region at one side of the installation a bending sensor (strain gauge), and in the flexible display device on each side of the non-curved area mounted a reference resistor. Alternatively, can be in one side of the flexible display device is arranged in the curved region of the two bending sensor (strain gauge), and can be of the flexible display device on one side of the non-curved area mounted two reference resistor.

Two curved sensor (strain gauge) is fitted to the tip of a flexible display device in the curved region, and two reference resistors are vertically arranged in the flexible display device of the non-curved in the area.

In addition, two curved sensor (strain gauge) in accordance with one of the can such that the bending sensor (strain gauge) to the left of the flexible display device is installed in the in the curved region of the,, and another bend sensor (strain gauge) can be such that the bend sensor in accordance with the (strain gauge) inclined to the right of way to install in the flexible display device in a bent region. In fig. 15 in, two curved sensor (strain gauge) by R1 and R3 indication, and by two reference resistor R2 and R4 indication.

Therefore, the use of fitted to the tip of the bending of the flexible display device in the area of the bending sensor to the flexible display device of distinguishable from the normal bending and twisting.

In other words, when the flexible display device without the curved region of the bend, as shown in Figure 15B shown, bending sensor R1 or R3 has the width L and the length of the W. However, because of the bending sensor is fitted to the tip of a flexible display device in the curved region, therefore bending sensor R1 or R3 has length L1 (=(L + W)/√ 2) and width W1 (=(L + W)/√ 2).

When the flexible display device the curved region of the bend, the bend sensor R1 or R3 has the length and the width of the L'W'.

As mentioned above, when the bending region is bent, the bending sensor R1 or R3 L'of the length, width W't' use and the thickness of the reference view 5 of illustration characteristic is expressed as follows.

[Formula 3]

L'=√ [L1x (1 + ε) x2/32 + W1x (1 - νx ε) x2/32]

W ' ≈ √ [L1x (1 + ε)/32 + W1x (1 - νx ε)/32]

The type 3 in, it is assumed that L=4 and W=2, then the L'into 4.0134 (increased 0.34%), W 'into 2.0067 (increased 0.34%), and the resistance change (R - R')/R into a 0.34%.

In accordance with the bending of the sensor with the reference resistor R2 and R4 is the same as the case of the vertically arranged, the bending resistance of the sensor changes from about 1.68%. However, in bending sensor is inclined mounting of the circumstances, even if the bending resistance of the sensor changes small, bending the sensor is capable of sensing the curvature of the flexible display device.

Therefore, even if the bending sensor is fitted to the tip of the bending of the flexible display device under the condition in the area, even when the curved region of the flexible display device is not twisted but when the normal bending, bending the sensor is capable of sensing the curvature of the flexible display device.

Figure 16A and Figure 16B is the view, and Figure 16B is the view of instantiated according to the 4th embodiment of the present invention sensor in the bending of the bending sensor is fitted to the tip of the bending of the flexible display device in the area of the distortion and the curved region of the length and the width of the change of the view, wherein Figure 16A is instantiated the bending sensor is fitted to the tip of the bending of the flexible display device in the area of the situation of when in the curved region of the 1st bending sensor R1 on the tilted direction of the distortion of the 1st bending sensor when R1 and when the state of the bending region in the 1st bending sensor R1 on the tilted direction of distortion when the bend sensor 2nd R3 of the state of the.

As shown in Figure 16A shown, in each of the flexible display device in a bent region at one side of the installation a bending sensor (strain gauge), and in the flexible display device on each side of the non-curved area mounted a reference resistor. Alternatively, can be in one side of the flexible display device is arranged in the curved region of the two bending sensor (strain gauge), and can be of the flexible display device on one side of the non-curved area mounted two reference resistor.

Two curved sensor (strain gauge) is fitted to the tip of a flexible display device in the curved region, and two reference resistors are vertically arranged in the flexible display device of the non-curved in the area.

(Strain gauge) in the bend sensor a (namely, 1st bending sensor R1) in accordance with the so that the bending sensor (strain gauge) to the right in a manner to inclined mounting of the flexible display device in the curved region of the, and another bend sensor (strain gauge) (i.e., the bend sensor 2nd R3) in accordance with the so that the bending sensor (strain gauge) to the left of the flexible display device mounted in a bent region. In fig. 16A in, two curved sensor (strain gauge) by R1 and R3 indication, and by two reference resistor R2 and R4 indication.

Therefore, the use of fitted to the tip of the bending of the flexible display device in the area of the bending sensor to the flexible display device of distinguishable from the normal bending and twisting.

In other words, as shown in Figure 16B shown, when in the curved region of the 1st bending sensor R1 on the tilted direction of the distortion, 1st bending sensor R1 indicates no resistance change, but the bend sensor 2nd R3 resistance variation is larger than the 1st bending sensor R1 of the resistance change.

When the 2nd bending sensor R3 resistance variation is larger than the 1st bending sensor R1 when the resistance change, the flexible display device can be determined twist to the right (in the 1st bending sensor R1 inclined direction). In addition, also can be based on the 1st bending sensor R1 of resistance change with the 2nd bending sensor R3 resistance variation of the difference between the sensing of the flexible display device of the distortion angle.

On the other hand, when the 1st bending sensor R1 resistance variation is larger than the bend sensor 2nd R3 when the resistance change, can determine the distortion of the flexible display device to the left (in the 2nd bending sensor R3 inclined direction). In addition, also can be based on the 1st bending sensor R1 of resistance change with the 2nd bending sensor R3 resistance variation of the difference between the sensing of the flexible display device of the distortion angle.

Therefore, in the embodiment of the present invention in the 4th, 1st bending sensor R1 and 2nd bending sensor R3 in accordance with the bending sensor and 2nd 1st bending sensor in a different direction on the inclined mounting of the flexible display device in the curved region, and measuring 1st bending sensor R1 of the bend sensor resistance change and 2nd R3 of the resistance change. When the 1st bending sensor R1 of resistance change with the 2nd bending sensor R3 of almost the same as the resistance change, determining the flexible display device the curved region of the normal bending. Therefore, to calculate the strain ε and two curved sensor R1 and R3 of the change of the resistance, and based on the calculated value of measuring the bending angle of the flexible display device.

When the 1st bending sensor R1 resistance variation is larger than the bend sensor 2nd R3 when the resistance change, determining a flexible display device in the curved region of the 2nd bending sensor R3 on the tilted direction of distortion. On the other hand, when the 2nd bending sensor R3 resistance variation is larger than the 1st bending sensor R1 when the resistance change, determining a flexible display device in the curved region of the 1st bending sensor R1 on the tilted direction of distortion. Therefore, also can be based on the 1st bending sensor R1 of resistance change with the 2nd bending sensor R3 of the resistance change of the difference between the sensing of the flexible display device of the twist angle.

According to the invention of the 4th embodiment of the sensing device with the bending of the flexible display device, in addition to the bending sensor is fitted to the tip of the bending of the flexible display device other than in the area, can be in accordance with the bend sensor according to the present invention embodiment of the 1st to the 3rd embodiment of the sensing device in the same manner as the bending of the flexible display device mounted in a bent region.

Figure 17 is the floorplan of according to the 2nd embodiment of the present invention or the 3rd embodiment of the sensing device which is provided with a bending of the bending of the flexible display device in plan view of the sensor and a reference resistor, and Figure 18 is shown according to the present invention of the 4th embodiment of the sensing device which is provided with a bending of the flexible display device bends in the sensor and the reference resistor.

In the 2nd embodiment of the present invention or in the 3rd embodiment, as shown in Figure 17, bending sensor R1 and R3 and the reference resistor R2 and R4 in accordance with the make the bending sensor R1 and R3 and the reference resistor R2 and R4 with the flexible display device is parallel (or vertical) is installed in the flexible display device. In the embodiment of the present invention in the 4th, as shown in Figure 18, bending sensor R1 and R3 in accordance with the make the bending sensor R1 and R3 to the flexible display device inclined (so that the 1st bending sensor R1 right tilting and 2nd bending sensor R3 to the left) is installed in the flexible display device, and reference resistor R2 and R4 so that a reference resistor R2 and R4 with the flexible display device is parallel (or vertical) is installed in the flexible display device.

That is to say, the bending sensor R1 and R3 in accordance with the make the bending sensor R1 and R3 in the opposite direction in a manner to slope in the installation of the flexible display device.

As described above according to the obvious, according to the invention having a curved sensing device of the flexible display device has the following effects.

1st, bending sensors and the reference resistor is mounted in the flexible display device. Therefore, the bending sensors and the reference resistor has the same tolerance range. In addition, reduces the output offset voltage value, and has reduced depends on the temperature change of resistance deviation.

2nd, bending sensor in accordance with the bending so that the sensor sensing small resistance changes are converted to be the output of the output voltage of the filter is installed in the film can be stretched and compressed in the film. Therefore, the signal to noise ratio (SNR) improves, the bending angle can be precisely measured, and easy to realize to UI/UX application.

3rd, bending the sensor and the reference resistor is mounted including a plurality of film (layer) in the flexible display device, thereby curving the sensor and is used for outputting by a bend sensor of the signal detected in the route line can be formed by mounting the bend sensor film (layer) of use in the treatment of conductive material form. Therefore, does not need additional processing, and reducing the manufacturing cost.

4th, bending sensor fitted to the tip of the bending of the flexible display device in the area. Therefore, the flexible display device capable of sensing the normal bending and distortion, and they distinguish the two.

For technical personnel in the field and will be it is obvious, can in without departing from the spirit of this invention or the scope of the present invention carried out under the condition that the various changes and modify. Therefore, this invention aims at covering of the present invention fall into the attached claims and their equivalent within the scope of the changes and modify.

This application at the request of the Korean Patent application submitted 26 August 2015 no. 10 - 2015 - 0119944 and submitted for 30 November 2015 of the Korean Patent application no. 10 - 2015 - 0169421 interests, these Korean Patent application herein by reference in incorporated into, as completely as set forth in herein.