Holographic Apparatus and Method

The invention relates to a method of and apparatus for displaying a holographically generated video image having plural video frames. For each period there is provided a respective sequential plurality of holograms. The holograms of the plural video frames are displayed for viewing the replay field thereof, and the noise variance of each frame is perceived as attenuated by averaging across said plurality of holograms.

Holographic sensor

A sensor device comprising a holographic element comprises a grating or hologram recorded in a holographic recording medium wherein at least one physical and/or chemical and/or optical characteristic of the holographic element or the image produced by it varies as a result of variation in relative humidity or moisture content in the air surrounding the element. Also provided is an acrylamide-based photopolymer and an acrylamide-based reflection hologram.

High-speed wavefront optimization

A wavefront is optimized imaging a sample. A binary off-axis hologram is encoded by selective adoption of states for each mirror of a deformable mirror device, which is illuminated with an incident beam of light. A single diffraction order that has encoded phase-mask information is selected from light reflected from the deformable mirror device and focused onto the sample. Light scattered from the sample is directed to a photodetector. A transmission matrix through the sample is calculated from light received by the photodetector.

System, apparatus and method for extracting three-dimensional information of an object from received electromagnetic radiation

An apparatus and method to produce a hologram of an object includes an electromagnetic radiation assembly configured to receive a received electromagnetic radiation, such as light, from the object. The electromagnetic radiation assembly is further configured to diffract the received electromagnetic radiation and transmit a diffracted electromagnetic radiation. An image capture assembly is configured to capture an image of the diffracted electromagnetic radiation and produce the hologram of the object from the captured image.

Method and Device for 3-D Display Based on Random Constructive Interference

The present invention relates to a method and an apparatus for 3-D display based on random constructive interference. It produces a number of discrete secondary light sources by using an amplitude-phase-modulator-array, which helps to create 3-D images by means of constructive interference. Next it employs a random-secondary-light-source-generator-array to shift the position of each secondary light source to a random place, eliminating multiple images due to high order diffraction. It could be constructed with low resolution liquid crystal screens to realize large size real-time color 3-D display, which could widely be applied to 3-D computer or TV screens, 3-D human-machine interaction, machine vision, and so on.

NEAR-TO-EYE DISPLAY DEVICE WITH VARIABLE RESOLUTION

A near-to-eye display device includes a spatial light modulator and a microdisplay. The spatial light modulator provides a high-resolution focused image for central vision. The microdisplay provides a low-resolution defocused image for peripheral vision. The display has a large field of view. 1. A near-to-eye display device comprising:a computer unit;a point light source mounted to the near-to-eye display device;a spatial light modulator (SLM) mounted to the near-to-eye display device and operatively coupled to the computer unit, wherein the near-to-eye display device when in use is less than 25 cm from a user's eye, wherein light produced by the point light source illuminates the SLM and gets modulated by the SLM to produce modulated light, and the modulated light is directed on an exit pupil plane that includes a useful portion, and wherein a light wave distribution within the useful portion includes a computed light distribution from a virtual scene computed by the computer unit; anda microdisplay positioned on the near-to-eye display device to generate on a user's retina a defocused peripheral image that surrounds a focused image generated by the spatial light modulator, wherein the focused region in steerable to different locations on the microdisplay.2. (canceled)3. The near-to-eye display device of claim 1 , wherein the SLM has a first pixel pitch and the microdisplay has a second pixel pitch that is greater than the first pixel pitch.4. The near-to-eye display device of claim 1 , wherein the modulated light is steerable across the exit pupil plane to follow the motion of a user's eye pupil when the near-to-eye display device is in use.5. The near-to-eye display device of claim 1 , wherein the point light source comprises a plurality of light sources to emit light of different wavelengths.6. The near-to-eye display device of claim 5 , wherein the plurality of light sources emit light sequentially.7. The near-to-eye display device of claim 1 , wherein the ...

Near-to-eye display device with spatial light modulator and pupil tracker

A near-to-eye display device includes a spatial light modulator, a rotatable reflective optical element and a pupil-tracking device. The pupil-tracking device tracks the eye pupil position of the user. Based on the data provided by the pupil-tracking device, the reflective optical element is rotated such that the light modulated by the spatial light modulator is directed towards the user's eye pupil.

Method and Master for Producing a Volume Hologram

A method for producing a volume hologram with at least one first area in a first color and at least one second area in a second color includes, providing a volume hologram layer made of a photopolymer; arranging a master with a surface structure on the volume hologram layer; exposing the master using coherent light, wherein light which is incident on at least one first partial area of the surface of the master is diffracted or reflected in the direction of the at least one first area of the volume hologram layer and light which is incident on at least one second partial area of the surface of the master is diffracted or reflected in the direction of the at least one second area of the volume hologram, and wherein the light diffracted or reflected by the first and second partial areas differs in at least one optical property.

SYSTEM, APPARATUS AND METHOD FOR EXTRACTING THREE-DIMENSIONAL INFORMATION OF AN OBJECT FROM RECEIVED ELECTROMAGNETIC RADIATION

An apparatus and method to produce a hologram of an object includes an electromagnetic radiation assembly configured to receive a received electromagnetic radiation, such as light, from the object. The electromagnetic radiation assembly is further configured to diffract the received electromagnetic radiation and transmit a diffracted electromagnetic radiation. An image capture assembly is configured to capture an image of the diffracted electromagnetic radiation and produce the hologram of the object from the captured image. 1. An apparatus configured to produce a hologram of an object , said apparatus comprising:an electromagnetic source configured to provide incoherent electromagnetic radiation on the object;a correlator comprising a first optical assembly configured to receive incoherent electromagnetic radiation reflected by or scattered from the object and transmit transformed electromagnetic radiation, a mask assembly configured to receive the transformed electromagnetic radiation and transmit amplitude and/or phase modified electromagnetic radiation, and a second optical assembly configured to receive the amplitude and/or phase modified electromagnetic radiation and further transmit transformed electromagnetic radiation;an image capture assembly configured to capture an image of the further transmitted transformed electromagnetic radiation; anda processing system including at least one processor, the processing system configured to produce the hologram of the object based on the captured image.2. The apparatus of claim 1 , wherein the first optical assembly claim 1 , the mask assembly claim 1 , the second optical assembly claim 1 , and the image capture assembly are disposed along a common optical path.3. The apparatus of claim 1 , wherein the mask assembly includes one or more diffractive optical elements claim 1 , each of the one or more diffractive optical elements including an array of plural transform regions claim 1 , each of which is configured to ...

Dynamic Holography Printing Device

A printing device ( 106 ) includes a laser source ( 110 ) and a LCOS-SLM (Liquid Crystal on Silicon Spatial Light (Modulator, 112 ). The printing device generates a laser control signal and a LCOS-SLM control signal. The laser source generates a plurality of incident laser beams based on the laser control signal. The LCOS-SLM receives the plurality of incident laser beams, modulates the plurality of incident laser beams based on the LCOS-SLM control signal, and generates a plurality of holographic wavefronts ( 214, 216 ). Each holographic wavefront forms at least one focal point. The printing device cures a surface layer of a target material ( 206 ) at interference points of focal points of the plurality of holographic wavefronts. The cured surface layer of the target material forms a two-dimensional printed content.

Holographic System for Controlling Plasma

A device ( 200,300 ) forms steerable plasma ( 222, 310 ) using a laser source ( 110 ) and a LCOS-SLM, Liquid Crystal on Silicon Spatial Light Modulator ( 112 ). The device generates a laser control signal and a LCOS-SLM (Liquid Crystal on Silicon Spatial Light Modulator) control signal. The laser source generates a plurality of incident laser beams based on the laser control signal. The LCOS-SLM receives the plurality of incident laser beams, modulates the plurality of incident laser beams based on the LCOS-SLM control signal to form a plurality of holographic wavefronts. Each holographic wavefront forms at least one corresponding focal point. The LCOS-SLM forms plasma at interference points of the focal points of the plurality of holographic wavefronts.

Holographic display apparatus and method for providing expanded viewing window

A holographic display apparatus capable of providing an expanded viewing window and a display method are provided. The holographic display apparatus includes an image processor configured to provide computer generated hologram (CGH) data to a spatial light modulator, wherein the image processor is further configured to generate a hologram data array comprising information of the holographic image to be reproduced at the first resolution or a resolution less than the first resolution, perform an off-axis phase computation on the hologram data array at the second resolution, and then, generate the CHG data at the first resolution.

Diffractive optic for holographic projection

Technology is described for methods and systems for a diffractive optic device ( 525 ) for holographic projection. The diffractive optic device can include a lens ( 535 ) configured to convey a hologram. The lens ( 535 ) further comprises a patterned material ( 510 ) formed with an array of cells having a non-planar arrangement of cell heights extending from a surface of the patterned material. The lens further optionally comprises a filling material ( 530 ) to fill gaps on both surfaces of the patterned material.

METHOD AND DEVICE FOR ENCODING THREE-DIMENSIONAL SCENES WHICH INCLUDE TRANSPARENT OBJECTS IN A HOLOGRAPHIC SYSTEM

Method for computing the code for the reconstruction of three-dimensional scenes which include objects which partly absorb light or sound. The method can be implemented in a computing unit. In order to reconstruct a three-dimensional scene as realistic as possible, the diffraction patterns are computed separately at their point of origin considering the instances of absorption in the scene. The method can be used for the representation of three-dimensional scenes in a holographic display or volumetric display. Further, it can be carried out to achieve a reconstruction of sound fields in an array of sound sources. 1. A method for computing holographic encoding values for an optical light modulator of a holographic system for the reconstruction of three-dimensional scenes , which include objects with transparent properties , for at least one observer eye , comprising:dividing the three-dimensional scene into individual object points and determining the coordinates of these object points,determining a virtual observer position which corresponds with the position of a selected observer eye where the three-dimensional scene is apparently perceived,determining all object points to be encoded which are not fully covered by other opaque object points seen from the virtual observer position as visible real or virtual object points,sorting of all visible object points to be encoded which are seen at the same angle from the virtual observer position by their distance to the virtual observer position,determining the actual brightness of each visible object point, with considering the location and intensity of all real and virtual light sources of the scene at the position of those object points at the angle at which they are seen from the virtual observer position, where the physical properties of the objects including the real and virtual light sources are taken into account,determining for each visible object point to be encoded an apparent brightness value with which the ...

Spatial light modulator

A liquid crystal on silicon spatial light modulator comprising an array of light-modulating pixels and a controller are disclosed. Each light-modulating pixel of the array comprises liquid crystal and is associated with a respective flip-flop. The controller receives a hologram of an image comprising a plurality of hologram pixels. Each hologram pixel comprises a respective n-bit hologram pixel value. The controller drives each light-modulating pixel in accordance with a respective hologram pixel value of the hologram. There is a one-to-n pixel correlation between the hologram and the light-modulating pixels. The flip-flops of each contiguous group of n light-modulating pixels are connected in series to form a shift register. During operation of the shift register, the n-bit hologram pixel value associated with each contiguous group of n light-modulating pixels is provided to each light-modulating pixel one bit at a time over the course of at least n clock cycles.

Hologram Replicator Assemblies For Head Up Displays Including Continuous Transmission Neutral Density Filters And Corrective Leveling Elements

A replicator assembly includes reflective, transmissive, and transparent elements. The reflective element receives and reflects a hologram of a HUD system. The transmissive element includes a partially transmissive portion that receives a reflection of the hologram from the reflective element, outputs N replications of the hologram, and reflects N−1 replications of the hologram. The partially transmissive portion is implemented as a continuous transmission neutral density filter across different phase regions. The phase regions of the partially transmissive portion correspond respectively to the N replications. N is an integer greater than or equal to 2. The reflective element reflects the N−1 replications of the hologram. The transparent element is disposed between the reflective and transmissive elements and guides the N replications of the hologram between the reflective and transmissive elements. The reflective, transmissive and transparent elements are implemented as a replicator and collectively provide the N replications of the hologram. 1. A replicator assembly comprising:a first reflective element configured to receive and reflect a first hologram generated by one or more light sources and one or more modulators of a head up display system;a first transmissive element comprising a partially transmissive portion, wherein the partially transmissive portion is configured to receive a reflection of the first hologram from the first reflective element, output N replications of the first hologram, and reflect at least N−1 replications of the first hologram, wherein the partially transmissive portion is implemented as a continuous transmission neutral density filter across different phase regions, wherein the phase regions of the partially transmissive portion correspond respectively to the N replications, where N is an integer greater than or equal to 2, andwherein the first reflective element is configured to reflect at least the N−1 replications of the first ...

POLARIZATION DIFFRACTION ELEMENT AND VECTOR BEAM MODE DETECTION SYSTEM USING THE SAME

A polarization diffraction element comprising a film including a liquid crystalline material having photosensitivity, the film having at least one hologram recorded therein, and thereby having a property as a fork-shaped polarization grating having an anisotropic structure in which an optical axis continuously rotates toward a direction of a grating vector. 1. A polarization diffraction element comprisinga film including a liquid crystalline material having photosensitivity,the film having at least one hologram recorded therein,and thereby having a property as a fork-shaped polarization grating having an anisotropic structure in which an optical axis continuously rotates toward a direction of a grating vector.2. The polarization diffraction element as claimed in claim 1 ,wherein a plurality of polarization holograms is recorded in the film, andwhere each of the polarization holograms has the property as the fork-shaped polarization grating, and the direction of the grating vector and a topological charge applied to diffracted light are different from each other.4. A vector beam mode detection system comprising:{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'the polarization diffraction element as claimed in ;'}single-mode optical fibers having light-incident end faces located in ±1st-order diffraction directions of the polarization grating formed by at least one polarization hologram recorded in the polarization diffraction element; anda photodetector configured to detect light guided through the single-mode optical fibers, whereinlight converted to Gaussian beam by the polarization diffraction element is detected through the single-mode optical fibers, thereby detecting a mode of a vector beam incident on the polarization diffraction element.5. A method for producing the polarization diffraction element as claimed in claim 2 , comprising:forming a coating film comprising the liquid crystalline material having photosensitivity;recording a polarization hologram ...

Holographic image display system

Disclosed are methods and systems for displaying images, and for implementing volumetric user interfaces. One exemplary embodiment provides a system comprising: a light source; an image producing unit, which produces an image upon interaction with light approaching the image producing unit from the light source; an eyepiece; and a mirror, directing light from the image to a surface of the eyepiece, wherein the surface has a shape of a solid of revolution formed by revolving a planar curve at least 180° around an axis of revolution.

LIGHTGUIDE BASED HOLOGRAPHIC DISPLAY

A holographic display with a spatial light modulator coupled to a pupil-replicating lightguide is disclosed. The spatial light modulator provides a light beam with spatially modulated amplitude and/or phase. The light beam is replicated by the pupil-replicating lightguide into a plurality of portions. The portions interfere at an exit pupil to provide an image for direct observation by a user. An eye-tracking system may be provided to determine the position of the user pupils, and the spatial modulation of the light beam may be adjusted accordingly to make sure that the optical interference of the beam portions at the eye pupils provides the required image. 1. A display comprising:an illuminator for providing an illuminating light beam;a spatial light modulator (SLM) operably coupled to the illuminator for receiving and spatially modulating at least a phase of the illuminating light beam to provide an image light beam having a spatially varying wavefront; anda first replicating lightguide operably coupled to the SLM for receiving the image light beam and providing multiple laterally offset portions of the image light beam at an eyebox of the display;wherein the spatially varying wavefront of the image light beam has such a shape that the portions of the image light beam add or subtract coherently at an exit pupil of the display to form an image for direct observation by a user.2. The display of claim 1 , wherein the illuminator comprises a light source for providing a collimated light beam claim 1 , and a second replicating lightguide configured to receive the collimated light beam and provide multiple portions of the collimated light beam claim 1 , so as to form the illuminating light beam for coupling to the SLM.3. The display of claim 2 , wherein the SLM is a reflective SLM configured to form the image light beam by reflecting the illuminating light beam with spatially variant phase delays claim 2 , wherein upon reflection claim 2 , the image light beam ...

Holographic display device and holographic display method

There is provided a holographic display device, which includes a display panel including plural sub-pixels, wherein each sub-pixel includes plural subdivided pixels, and each subdivided pixel has an adjustable light transmittance; a backlight, configured to provide reference light to the display panel; a phase adjustment layer, including plural transparent phase adjustment components, wherein each phase adjustment component is configured to adjust a phase of a light ray transmitted through the phase adjustment component, and the phase adjustment components corresponding to a single sub-pixel have phase adjustment amounts different from each other; and a controller, configured to obtain a target phase of a light ray to be transmitted through each sub-pixel, and determine a target subdivided pixel, which corresponds to the target phase, in each sub-pixel, and further configured to obtain a target intensity of the light ray, and adjust a light transmittance of the target subdivided pixel.

Photosensitive polymers for volume holography

Photosensitive polymers for recording volume holograms, anisotropic volume holograms, and corresponding volume holographic elements are described herein.

Simplified geometry for fabrication of polarization-based elements

Disclosed are various methods for creating optical elements through holographic fabrication. One method includes positioning a reflector in an optical path, disposing a first substrate proximal to the reflector along the optical path, disposing a first photosensitive film on the side of the first substrate facing the reflector, transmitting a light beam at a first polarization from a light source along the optical path, reflecting the light beam off the reflector, wherein the reflected light beam has a second polarization, receiving the reflected light beam through the first film and the first substrate, and applying a liquid crystal layer to the first photosensitive film to reproduce the alignment pattern of the first film on the liquid crystal layer.

HOLOGRAM DISPLAY USING A LIQUID CRYSTAL DISPLAY DEVICE

A method of driving a display device. The display device comprises a liquid crystal panel, a display engine and a hologram engine. The liquid crystal display panel comprising a plurality of pixels. The display device comprises a display engine arrange to drive each pixel of the plurality of pixels during each display interval of a plurality of display intervals defined by the display device. Each pixel is driven in accordance with a drive signal. The drive signal may comprise a pixel voltage for each pixel. The display engine is arranged to invert the polarity of the drive signal every display interval. The hologram engine is arranged to send multi-level phase holograms for display to the display engine. The method comprises displaying the multi-level phase holograms in immediately consecutive display intervals without field inversion. 1. A display device comprising:a liquid crystal display panel comprising a plurality of pixels;a display engine arranged to drive each pixel of the plurality of pixels, in accordance with a drive signal, during each display interval of a plurality of display intervals defined by the display engine, wherein the display engine is arranged to invert the polarity of the drive signal every n display intervals, wherein n is an integer;a hologram engine arranged to send a sequence of multi-level phase holograms for display to the display engine; andwherein the display engine is arranged to display each multi-level phase hologram of the sequence in a respective display interval, wherein the display intervals used to display the multi-level phase holograms of the sequence are immediately consecutive.2. A display device as claimed in wherein each hologram is displayed during only one display interval.3. A display device as claimed in any preceding claim wherein the hologram engine is arranged to calculate each hologram using an iterative phase retrieval algorithm.4. A display device as claimed in any preceding claim wherein each pixel is a ...

IMAGING THROUGH SCATTERING MEDIA

Example embodiments provide digital holographic techniques and associated systems for imaging through scattering media in a strictly one-sided observation in which the observer (e.g. the controller of the camera) has no access to the object plane nor does the observer introduce a fluorescing agent to the object plane. An example imaging system comprises a laser source, a digital sensor array, and a processing system. The processing system transmits light from the laser source to a target object; detects interference formed on the digital sensor array by a reference beam from the transmitted light and reflected light from the target object, the reflected light either travelling through or being reflected by a scattering medium located between the target object and the digital sensor array; jointly estimating, based on the detected interference, parameters defining the scattering behavior of the particular scattering medium and an image of the target object; and outputting the jointly estimated scattering parameters and an image of the target object. 1. An imaging system , comprising:a laser source;a digital sensor array; transmitting light from the laser source to a target object;', 'detecting interference formed on the digital sensor array by a reference beam from the transmitted light and reflected light from the target object, the reflected light either travelling through or being reflected by a scattering medium located between the target object and the digital sensor array;', 'jointly estimating, based on the detected interference, the scattering medium and an image of the target object; and', 'outputting the jointly estimated image of the target object., 'a processing system including at least one processor, the processing system being configured to perform operations comprising2. The imaging system according to claim 1 , wherein the reflected light from the target object travels through the scattering medium claim 1 , and wherein the scattering medium includes ...

Rotational Geometric Phase Hologram with Application for Fabricating Geometric Phase Optical Element

A rotational geometric phase hologram has geometric phase optical elements (GPOEs) serially cascaded along a common optical axis to form a GPOE cascade used for receiving a linearly-polarized light beam and generating output light beams at an exit surface of the last GPOE. Interference occurred in the output light beams creates a polarization interference pattern on the exit surface. A photoalignment substrate, when positioned in close proximity to the exit surface, records the pattern. Advantageously, each GPOE is rotatable about the common optical axis. Respective rotation angles of the GPOEs are determined according to a spatially-varying linear polarization orientation distribution selected to be generated for the polarization interference pattern. Particularly, the respective rotation angles are reconfigurable to provide the periodicity required for the spatially-varying linear polarization orientation distribution over a range of allowed periodicities while keeping the periodicity of spatially-varying optic axis orientation distribution of each GPOE to be fixed. 1. An apparatus comprising:plural geometric phase optical elements (GPOEs) serially cascaded along a common optical axis to form a GPOE cascade, the GPOE cascade having first and last GPOEs for receiving a linearly-polarized (LP) light beam at the first GPOE and generating a plurality of output light beams exited from an exit surface of the last GPOE, each GPOE in the GPOE cascade being rotatable about the common optical axis and having a rotation angle measured from a reference axis orthogonal to the common optical axis, wherein interference occurred in the plurality of output light beams creates a polarization interference pattern on the exit surface, and respective rotation angles of the GPOEs in the GPOE cascade are reconfigurable and determined according to a spatially-varying linear polarization orientation distribution selected to be generated for the polarization interference pattern.2. The ...

VARIABLE SHEAR WITH VOLUME HOLOGRAMS

An optical device including a first rigid substrate, a flexible holographic optical element, a transparent flexible material having a variable shear transmission property across an in-plane direction of the flexible holographic optical element, and a second rigid substrate, wherein the flexible holographic optical element and the transparent flexible material are located between the first and second rigid substrates, wherein the variable shear transmission property of the transparent flexible material transmits variable amounts of a shear force applied to the first or second rigid substrates across the in-plane direction of the flexible holographic optical element. 1. An optical device comprising:a first rigid substrate;a flexible holographic optical element;a transparent flexible material having a variable shear transmission property across an in-plane direction of the flexible holographic optical element; anda second rigid substrate, wherein the flexible holographic optical element and the transparent flexible material are located between the first and second rigid substrates; whereinthe variable shear transmission property of the transparent flexible material transmits variable amounts of a shear force applied to the first or second rigid substrates across the in-plane direction of the flexible holographic optical element.2. The optical device of claim 1 , wherein the flexible holographic optical element is a flexible volume Bragg grating.3. The optical device of claim 1 , wherein the flexible holographic optical element is a flexible volume hologram.4. The optical device of claim 1 , wherein the flexible holographic optical element has a non-uniform grating vector.5. The optical device of claim 1 , wherein the variable shear transmission property of the transparent flexible material is achieved at least in part by the transparent flexible material having a variable thickness across the in-plane direction.6. The optical device of claim 1 , wherein the variable ...

Holographic Recording Composition

A pressure sensitive holographic recording composition is described wherein the composition comprises diacetone acrylamide, glycerol and citric acid. The composition is capable of recording high diffraction efficiency reflection holograms. 124-. (canceled)25. A holographic recording composition comprising diacetone acrylamide , citric acid , and glycerol.26. The holographic recording composition as claimed in claim 25 , wherein the holographic recording composition is a pressure sensitive holographic recording composition claim 25 , wherein a colour change occurs in the image reconstructed from a hologram recorded in the composition in response to a change in pressure applied to the composition.27. The holographic recording composition as claimed in claim 26 , wherein sensitivity to change in pressure is manifested by a change in the wavelength of a reconstructed light from a reflection hologram recorded in such composition.28. The holographic recording composition as claimed in claim 25 , which is configured to record pressure sensitive holograms having a diffraction efficiency in the range 25% to 40% when recorded at a spatial frequency in the range of 2500 l/mm to 3500 l/mm.29. The holographic recording composition as claimed in claim 25 , further comprising a free radical generator claim 25 , a photoinitiator claim 25 , and a binder.30. The holographic recording composition as claimed in claim 29 , wherein the free radical generator is selected from the group consisting of triethanolamine (TEA) claim 29 , Diethanolamine (DEA) claim 29 , Ethanolamine (EA) claim 29 , Trethlyamine (TETN) claim 29 , Diethylamine (DETN) claim 29 , and Ethylenediaminetetraacetic acid (EDTA).31. The holographic recording composition according to claim 30 , wherein the free radical generator comprises triethanolamine.32. The holographic recording composition according to claim 31 , wherein the triethanolamine is present in an amount in the range of 20% w/w to 45% w/w.33. The holographic ...

HOLOGRAPHIC IMAGE DISPLAY SYSTEM

A volumetric display system including a volumetric display for displaying a scene viewable as a three-dimensional floating-in-the-air scene in a display space, enabling a user to reach a first object into the display space, a location determination unit locating real objects in the display space, providing a location of the first object when the first object is inserted into the display space, and a computer for receiving the location of the first object, detecting when the location of the first object is at a location where an object is displayed in the three-dimensional scene, thereby determining that the first object is viewable as touching the displayed object following a detection of the first object viewable as touching the displayed object, producing a new three-dimensional scene displaying the displayed object as if manipulated by the first object. Related apparatus and methods are also described. 1. A method of providing a user interface for a volumetric display , comprising:displaying a scene viewable as a three-dimensional floating-in-the-air scene in a display space;detecting a location of a first object inserted into the display space;detecting when the location of the first object is at a location where an object is displayed in the three-dimensional scene, thereby determining that the first object is viewable as touching the displayed object; andfollowing a detection of the first object viewable as touching the displayed object, producing a new three-dimensional scene displaying the displayed object as if manipulated by the first object.2. The method of wherein the first object is a user's hand.3. The method of and further comprising:measuring a location of the user's fingers in the display space; anddetermining that the user's hand is viewable as grabbing the displayed object based on measuring a gap between the user's fingers.4. The method of and further comprising providing a plurality of visual depth cues to a viewer of the three-dimensional ...

Method of Hologram Calculation

A method of calculating a hologram having an amplitude and a phase component. The method comprises (i) receiving an input image comprising a plurality of data values representing amplitude. The method then comprises (ii) assigning a random phase value to each data value of the plurality of data values to form a complex data set. The method then comprises (iii) performing an inverse Fourier transform of the complex data set. The method then comprises (iv) constraining each complex data value (X1, X2) of the transformed complex data set to one of a plurality of allowable complex data values (GL1-GL8), each comprising an amplitude modulation value and a phase modulation value, to form a hologram, wherein, the phase modulation values (GL1-GL7) of the plurality of allowable complex data values substantially span at least 3π/2 and at least one of the allowable complex data values has an amplitude modulation value of substantially zero (GL8) and a phase modulation value of substantially zero.

Wide-field microscopy using self-assembled liquid lenses

A method of imaging a sample includes depositing a droplet containing the sample on a substrate, the sample having a plurality of particles contained within a fluid. The substrate is then tilted to gravitationally drive the droplet to an edge of the substrate while forming a dispersed monolayer of particles having liquid lenses surrounding the particles. A plurality of lower resolution images of the particles contained on the substrate are obtained, wherein the substrate is interposed between an illumination source and an image sensor, wherein each lower resolution image is obtained at discrete spatial locations. The plurality of lower resolution images of the particles are converted into a higher resolution image. At least one of an amplitude image and a phase image of the particles contained within the sample is then reconstructed. In some embodiments, only a single lower resolution image may be sufficient.

HOLOGRAPHIC DISPLAY APPARATUS AND METHOD FOR PROVIDING EXPANDED VIEWING WINDOW

Provided is a holographic display apparatus including a light source configured to emit light, a spatial light modulator configured to form a hologram pattern to modulate the light incident thereon and reproduce a hologram image, the spatial light modulator including a plurality of display pixels that are arranged two-dimensionally, and an optical element provided opposite a light incidence surface of the spatial light modulator or a light exit surface of the spatial light modulator, the optical element including an array of a plurality of light transmission patterns that are arranged irregularly 1. A holographic display apparatus comprising:a light source configured to emit light;a spatial light modulator configured to form a hologram pattern to modulate the light incident thereon and reproduce a hologram image, the spatial light modulator comprising a plurality of display pixels that are arranged two-dimensionally; andan optical element provided opposite a light incidence surface of the spatial light modulator or a light exit surface of the spatial light modulator, the optical element comprising an array of a plurality of light transmission patterns that are arranged irregularly.2. The holographic display apparatus of claim 1 , wherein a resolution of the array of the plurality of light transmission patterns is greater than a resolution of the spatial light modulator.3. The holographic display apparatus of claim 2 , further comprising: generate hologram data based on the hologram image to be reproduced at a resolution corresponding to the resolution of the array of the plurality of light transmission patterns,', 'extract the hologram data that is generated corresponding to a position of each of the plurality of light transmission patterns, and', 'provide the extracted hologram data to the spatial light modulator., 'an image processor configured to4. The holographic display apparatus of claim 3 , wherein the plurality of display pixels of the spatial light ...

Volume hologram sheet to be embedded, forgery prevention paper, and card

An object of the present invention is to provide a thin volume hologram sheet to be embedded sufficiently resistant to a mechanical stress such as a stress including a tensile stress, a shear stress and a compression stress at the time of processing even under a heating condition, a forgery prevention paper and a card using the same. The object is achieved by providing a volume hologram sheet to be embedded comprising a volume hologram layer, and a substrate disposed only on one side surface of the volume hologram layer using an adhesion means, wherein a peeling strength of the volume hologram layer and the substrate is 25 gf/25 mm or more.

HOLOGRAPHIC IMAGE DISPLAY DEVICE

A holographic image display device according to one embodiment comprises: an image display unit on which a holographic image is displayed; and a spatial impression providing unit which forms a space surrounding the holographic image, and includes a transparent color material such that the space looks colored and the holographic image can be recognized from the outside. 1. A holographic image display device comprising:an image display unit configured to display a holographic image; anda spatial impression providing unit configured to form a space surrounding the holographic image, the spatial impression providing unit comprising a colored transparent material which allows the holographic image to be seen through the spatial impression providing unit from outside while allowing the space to be seen colored.2. The holographic image display device of claim 1 , wherein the image display unit includes:an image projector configured to project the holographic image; anda screen unit including a first surface which reflects the holographic image projected thereto toward the outside and a second surface on which an absorbing member for absorbing light introduced from the outside is disposed.3. The holographic image display device of claim 2 , wherein the first surface is formed of a plurality of Fresnel lenses or a plurality of prisms.4. The holographic image display device of claim 1 , wherein the image display unit includes:a panel for displaying the holographic image; anda backlight unit for providing a backlight to the panel.5. The holographic image display device of claim 1 , wherein the spatial impression providing unit comprises an anti-reflection coating member.6. The holographic image display device of claim 1 , wherein the spatial impression providing unit has a light transmittance of 30% or less.7. The holographic image display device of claim 1 , wherein the spatial impression providing unit comprises a dynamic dye filter claim 1 , and a degree of color of the ...

Projection device, projection method, and program storage medium

A projection device is provided for finally displaying a clear desired target image while shortening time until the target image is displayed, the projection device including: a light source; a spatial modulation element reflecting light from the light source by a display unit displaying a phase distribution of a target image; a modulation element control means that performs, in parallel by different arithmetic units, first processing of generating a phase distribution of the target image and second processing of generating a phase distribution of the target image by processing with a calculation cost higher than the first processing, and displays a phase distribution generated by the second processing on a display surface of the spatial modulation element after displaying a phase distribution generated by the first processing on a display surface of the spatial modulation element; and a projection means that projects reflected light from the spatial modulation element.

SYSTEM AND METHOD FOR HIGH-QUALITY SPECKLE-FREE PHASE-ONLY COMPUTER-GENERATED HOLOGRAPHIC IMAGE PROJECTION

The present invention relates to a system and method for high quality speckle-free phase-only computer-generated holographic image projection. The present invention more particularly relates to a holographic image display system comprising a spatial light modulator to phase modulate light from at least one light source configured to illuminate said spatial light modulator and to provide a phase hologram and projection optics to project said phase modulated light to generate an image formed by said displayed hologram onto an image plane. 1. A holographic image-display system comprising:a spatial light modulator to phase modulate light from at least one light source configured to illuminate the spatial light modulator;a processing unit configured to divide an image plane into a plurality of image blocks and form a separate phase function having two-dimensional polynomial terms for each block, wherein a target image is mapped on the spatial light modulator aperture in a geometrically distorted form such that the energy distribution of the initial computer-generated hologram on a plane of the spatial light modulator is substantially uniform,wherein the processing unit is further configured to multiply the image blocks by the phase function to obtain an image plane wavefield which, with backpropagation, generates an initial computer-generated hologram with a substantially uniform energy distribution, to constitute the source of a phase hologram to be written on the spatial light modulator,wherein the processing unit is further configured to compute the phase hologram to be written on the spatial light modulator followed by discarding magnitude information to obtain pure phase,wherein the processing unit is further configured to map each image block of the image plane on a particular spatial light modulator region on the plane of the spatial light modulator using the separate phase function, andwherein the area of each of the spatial light modulator regions is ...

Digital infrared holograms

Embodiments are directed to an apparatus for creating a scene comprising: a plurality of micro-mirrors configured to rotate between an off position and at least two on positions to generate a plurality of holograms, and a processor configured to select positions for the micro-mirrors based on an input specification of the scene.

APPARATUS FOR HOLOGRAPHIC DISPLAY BY COMPLEX MODULATION AND METHOD THEREOF

In the present invention, by providing an apparatus for displaying a complex modulated holograph and including a light source configured to output light, a display configured to display the hologram by diffracting the output light through a plurality of pixels, and a processor configured to control the display to obtain complex hologram data corresponding to the hologram, and modulate the output light based on the complex hologram data and device information of the plurality of pixels, it is possible to modulate amplitude information and phase information of the light source into required values and display a complex hologram, and to remove a noise component of the hologram. 1. An apparatus for holographic display by complex modulation , comprising:a light source configured to output light;a display configured to display hologram by diffracting the output light through a plurality of pixels; anda processor configured to control the display to obtain complex hologram data corresponding to the hologram, and modulate the output light based on the complex hologram data and device information of the plurality of pixels.2. The apparatus of claim 1 , whereinthe display includes a plurality of first modulation pixels modulating a phase of the output light and a plurality of second modulation pixels modulating amplitude and phase of the phase modulated light, andthe device information of the plurality of pixels includes phase variation information according to amplitude variation of the plurality of second modulation pixels.3. The apparatus of claim 2 , whereinthe processor obtains a plurality of modulated light waves from the output light using the plurality of first modulation pixels, and displays the hologram by combining the plurality of modulated light waves.4. The apparatus of claim 3 , whereinthe processor modulates the phase of the output light so that the plurality of modulated light waves are evenly distributed in a complex space.5. The apparatus of claim 4 , ...

Reflective Holographic Display Apparatus and Display Method For The Same

A reflective holographic display apparatus and a display method thereof are disclosed. The reflective holographic display apparatus includes a front light source module, a display panel and a phase plate. The front light source module is configured to provide reference lights; the display panel is configured to adjust amplitude information of the reference lights, wherein the display panel includes a reflective layer and the front light source module is located at a light exit side of the display panel; and the phase plate is configured to adjust phase information of the reference lights and located at a light exit side of the reflective layer.

METHODS, SYSTEMS, AND COMPUTER READABLE MEDIA FOR IMPROVED DIGITAL HOLOGRAPHY AND DISPLAY INCORPORATING SAME

A method for digital holography includes modeling a hologram using a forward propagation model that models propagation of a light field from a hologram plane to an image plane. The method further includes computing the hologram as a solution to an optimization problem that is based on the model. The method further includes configuring at least one spatial light modulator using the hologram. The method further includes illuminating the spatial light modulator using a light source to create a target image. 1. A method for digital holography , the method comprising:modeling a hologram using a forward propagation model that models propagation of a light field from a hologram plane to an image plane;computing the hologram as a solution to an optimization problem that is based on the model;configuring at least one spatial light modulator using the hologram; andilluminating the spatial light modulator using a light source to create a target image.2. The method of wherein modeling the hologram using a forward propagation model includes modeling the hologram using an angular spectrum claim 1 , Fourier claim 1 , Fraunhofer claim 1 , or Fresnel propagation model.3. The method of wherein modeling the hologram using a forward propagation model includes modeling the hologram as a spatially invariant convolution of the hologram and a lens phase function.4. The method of wherein the optimization problem uses a least squares optimization function.9. The method of wherein configuring at least one spatial light modulator includes configuring a single phase only spatial light modulator.10. The method of wherein configuring at least one spatial light modulator includes configuring each of a pair of cascaded phase only spatial light modulators.13. The method of wherein computing hologram as a solution to the optimization problem comprises approximating a gradient of the penalty function ƒ using Wirtinger derivatives.14. The method of wherein the penalty function is based on perceptual ...

Holographic Projector

There is provided a holographic projector comprising a reflective liquid crystal display device. The reflective liquid crystal display device comprises a light-modulating layer between a first substrate and a second substrate substantially parallel to the first substrate. The light-modulating layer comprises planar-aligned nematic liquid crystals having positive dielectric anisotropy. The first substrate is substantially transparent and comprises a first alignment layer arranged to impart a first pre-tilt angle θl on liquid crystals proximate the first substrate, wherein θ1>5°. The second substrate is substantially reflective and comprises a second alignment layer arranged to impart a second pre-tilt angle Θ2 on liquid crystals proximate the second substrate, wherein θ2>5°. The reflective liquid crystal display device further comprises a plurality of pixels defined on the light-modulating layer having a pixel repeat distance x, wherein x≤10 μm. The distance d between inside faces of the first substrate and second substrate satisfies 0.5 μm≤d≤3 μm, and the birefringence of the liquid crystal Δη≥0.20. The holographic projector further comprises a display driver arranged to drive the reflective liquid crystal display device to display a hologram by independently-driving each pixel at a respective modulation level selected from a plurality of modulation levels having a phase modulation value.

Dynamic hologram parameter control

Systems, methods, and computer-readable media are disclosed for controlling parameters of a holographic image. A gaze direction of a user is detected and user interaction data indicative of the gaze direction of the user is generated. A determination is then made using the user interaction data that the gaze direction of the user at least partially coincides with an object of interest. A further determination is made that the object of interest is at least partially obscured by the holographic image. One or more of the parameters of the holographic image are then adjusted to enhance visibility of the object of interest to the user.

METHOD AND APPARATUS FOR PRODUCING INFORMATION FROM A CAMERA IMAGE

A method of producing information from at least one camera image of an object, including: A) recording raw image data of the at least one camera image, B) evaluating the raw image data by a mathematical linkage to produce combination image data, C) deriving the information from the combination image data, D) outputting the information, E) determining an actual measure for a data quality of the raw image data prior to or after evaluation steps in step B), F) determining a deviation between the actual measure for the data quality and a target measure for the data quality of the raw image data of at least one camera image, and G) again recording all raw image data of those camera images, for which the deviation determined in step F) is greater than a predetermined threshold value and repeating at least one evaluation step from step B) and steps C) to F) either until the deviation determined in step F) for the raw image data of all camera images from the plurality of camera images is less than the threshold value or until a predetermined termination condition is fulfilled. 1. A method of producing information from at least one camera image of an object comprising the steps:A) Recording raw image data of the at least one camera image, 'wherein in at least one of the plurality of evaluation steps the raw image data of the at least one camera image or image data derived from the raw image data of the at least one camera image are processed by means of a mathematical linkage with each other in such a way that combination image data are produced,', 'B) Evaluating the raw image data of the at least one camera image in a plurality of evaluation steps,'}C) Deriving the information from the combination image data, andD) Outputting the information, wherein the method further has the steps:E) Determining an actual measure for a data quality of the raw image data of at least one camera image prior to or after at least one of the plurality of evaluation steps in step B),F) ...

Maskless imaging of dense samples using multi-height lensfree microscope

A method of imaging includes illuminating a sample spaced apart from an image sensor at a multiple distances. Image frames of the sample obtained at each distance are registered to one another and lost phase information from the registered higher resolution image frames is iteratively recovered. Amplitude and/or phase images of the sample are reconstructed based at least in part on the recovered lost phase information.

METHOD FOR OBSERVING A SAMPLE

A method for observing a sample is provided, including illuminating the sample with a light source and forming a plurality of images, by an imager, the images representing the light transmitted by the sample in different spectral bands. From each image, a complex amplitude representative of the light wave transmitted by the sample is determined in a determined spectral band. The method further includes backpropagation of each complex amplitude in a plane passing through the sample, determining a weighting function from the back-propagated complex amplitudes, propagating the weighting function in a plane along which the matrix photodetector extends, updating each complex amplitude, in the plane of the sample, according to the weighting function propagated. 110.-. (canceled)11. A method for observing a sample , comprising:i) illuminating the sample using a light source that produces a light wave that propagates along a propagation axis;ii) acquiring, using a photodetector, a plurality of images of the sample, the images being formed in a detection plane, the sample being placed between the light source and the photodetector, each image of the plurality being representative of a light wave, transmitted by the sample under the effect of the illumination, called the transmitted light wave, and each image of the plurality being acquired in a spectral band that is different from that of other images of the plurality;iii) determining, based on each image respectively acquired in each spectral band, an initial complex amplitude of the transmitted light wave, in said each spectral band, in the detection plane;iv) selecting a sample plane, in which the sample lies, and back-propagating each complex amplitude established in the detection plane, in said each spectral band, in order to determine a complex amplitude of the transmitted wave, in said each spectral band, in the sample plane;v) calculating in said each spectral band, based on a plurality of complex amplitudes ...

PREPARATION SYSTEM AND METHOD FOR POLYMER-DISPERSED LIQUID CRYSTAL HOLOGRAPHIC GRATING

A system includes a laser emitting a laser beam, a beam expander expanding the laser beam, a beam splitter prism splitting the expanded laser beam into first and second split light beams, a liquid crystal box containing polymer-dispersed liquid crystal, first and second reflectors reflecting the first and second split light beams to the liquid crystal box, respectively, and an attenuator arranged on an optical path between the beam expander and the liquid crystal box. The attenuator gradually attenuates at least one of the laser beam, the expanded laser beam, the first split light beam, or the second split light beam along a first set curve. The first split light beam and the second split light beam form interference fringes at the liquid crystal box to expose the polymer-dispersed liquid crystal to form a polymer-dispersed liquid crystal holographic grating having a diffraction efficiency decreasing along a second set curve. 1. A system for preparing a polymer-dispersed liquid crystal holographic grating comprising:a laser configured to emit a laser beam;a beam expander configured to expand the laser beam to obtain an expanded laser beam;a beam splitter prism configured to split the expanded laser beam into a first split light beam and a second split light beam;a liquid crystal box containing polymer-dispersed liquid crystal;a first reflector configured to reflect the first split light beam to the liquid crystal box;a second reflector configured to reflect the second split light beam to the liquid crystal box; andan attenuator arranged on an optical path between the beam expander and the liquid crystal box, the attenuator being configured to gradually attenuate at least one of the laser beam, the expanded laser beam, the first split light beam, or the second split light beam along a first set curve;wherein the first split light beam and the second split light beam form interference fringes at the liquid crystal box to expose the polymer-dispersed liquid crystal to ...

Despeckling a computer generated hologram

A method for despeckling a Computer Generated Hologram (CGH) including producing a CGH, and jittering a location of an exit pupil of an optical system through which the CGH is imaged, relative to an observer's input pupil, so as to shift at least some speckles out of the exit pupil. A method for despeckling a Computer Generated Holographic movie including computing a first modulation of a first holographic image in a holographic movie, and computing a second modulation of a second holographic image using an initial phase distribution used for calculating the first holographic image as an initial phase distribution used for calculating the second modulation. Related apparatus and methods are also described.

FLOATING IMAGE DISPLAY DEVICE

A floating image display device includes an image display unit that displays a display image based on a first image signal, a floating-image-formation optical system that forms an image in air as a floating image from the display image, a guide image display unit that displays a guide image based on a second image signal nearby the floating image to be visually recognized on the same plane as the floating image as viewed from a viewer, and an image control unit that supplies the first image signal and the second image signal respectively to the image display unit and the guide image display unit. The image control unit supplies an image signal as the second image signal to the guide image display unit after the image signal undergoes at least one of a process of adding blurring, a process of lowering luminance and a process of lowering contrast. 1. A floating image display device comprising:an image display unit that displays a display image based on a first image signal;a floating-image-formation optical system that forms an image in air as a floating image from the display image;a guide image display unit that displays a guide image based on a second image signal nearby the floating image so that the guide image is visually recognized on a same plane as the floating image as viewed from a viewer; andan image control unit that supplies the first image signal to the image display unit and supplies the second image signal to the guide image display unit,wherein the image control unit supplies an image signal as the second image signal to the guide image display unit after the image signal undergoes at least one of a process of adding substantially a same level of blurring as blurring of the floating image to the guide image, a process of lowering luminance to substantially a same level as luminance of the floating image and a process of lowering contrast to substantially a same level as contrast of the floating image.2. The floating image display device according to ...

FLOATING IMAGE DISPLAY DEVICE

A floating image display device includes a floating-image-formation optical system that forms an image at an opening part as a floating image from an image displayed on an image display unit, an authentication unit that judges whether or not a subject passing through the opening part is an authorized subject, and an image control unit that makes the image display unit switch contents of the image when the subject is judged as the authorized subject. The floating-image-formation optical system can include a beam splitter and a retroreflective sheet. Another floating image display device includes an image display unit that displays a first image, a floating-image-formation optical system that forms an image at an opening part as a floating image from the first image, and an image projection unit that projects a second image onto a subject moving through the floating image when the subject passes through the opening part. 1. A floating image display device for displaying an image at an opening part that is open as an entrance through which a subject passes , the floating image display device comprising:an image display unit that displays a display image;a floating-image-formation optical system that forms the image at the opening part as a floating image from the display image;an authentication unit that judges whether or not the subject passing through the opening part is an authorized subject authorized to pass through the opening part; andan image control unit that makes the image display unit switch contents of the display image when the subject is judged as the authorized subject,wherein the floating-image-formation optical system includes any one of a beam splitter for splitting incident light into transmitted light and reflected light and a retroreflective sheet for retroreflecting light incident via the beam splitter, and a dihedral corner reflector array including a plurality of dihedral corner reflectors arranged on a plane.2. A floating image display device ...

METHOD AND APPARATUS FOR GENERATING FULL-COLOR HOLOGRAPHIC IMAGE

The present disclosure provides a method and apparatus for generating a full-color holographic image. The method of generating a full-color holographic image includes forming images for each color channel based on complex hologram data extracted from rays propagating from a target object, and combining the formed images into one color image, wherein the images for each color channel are formed at reconstruction points for each color channel derived based on the complex hologram data. 1. A method of generating a full-color holographic image , the method comprising:forming images for each color channel based on complex hologram data extracted from rays propagating from a target object; andcombining the formed images into one color image,wherein the images for each color channel are formed at reconstruction points for each color channel derived based on the complex hologram data.2. The method of claim 1 , wherein the complex hologram data is generated based on an interference fringe for each polarization and color channel extracted from an original image obtained by photographing the target object.3. The method of claim 2 , wherein the complex hologram data is derived by removing information on a light source and twin image information for each color channel based on the interference fringe.4. The method of claim 2 , wherein the interference fringe is recorded as a Fresnel fringe based on a Fresnel diffraction method.5. The method of claim 2 , wherein the interference fringe is recorded by a color polarization image sensor including polarizers having different phase values for each pixel.6. The method of claim 2 , wherein the original image is one of a raw claim 2 , bmp or png image.7. The method of claim 2 , wherein the images for each color channel are formed based on a Fresnel diffraction method using the interference fringe.8. The method of claim 2 , wherein the images for each color channel are formed based on an angular spectrum method using the interference ...

METHOD AND SYSTEM FOR GENERATING COMPUTER-GENERATED HOLOGRAM

The present disclosure provides a method for calculating a light field distribution in the process of generating a computer-generated hologram, including: performing a three-dimensional modeling to an object for which a hologram is to be generated so as to obtain a three-dimensional model of the object; determining the luminous characteristics of each voxel of the three-dimensional model at various azimuth angles within a viewing angle range of the hologram to be formed; and calculating a light field distribution of the object light wave of each voxel on the holographic plane based on the luminous characteristics of each voxel at various azimuth angles within the viewing angle range of the hologram to be formed. The present disclosure also provides a method and a system for generating a computer-generated hologram. 1. A method for calculating a light field distribution in the process of generating a computer-generated hologram , comprising:performing a three-dimensional modeling to an object for which a hologram is to be generated so as to obtain a three-dimensional model of the object;determining a luminous characteristics of each voxel of the three-dimensional model at various azimuth angles within a viewing angle range of the hologram to be formed; andcalculating a light field distribution of an object light wave of each voxel on a holographic plane based on the luminous characteristics of each voxel at various azimuth angles within the viewing angle range of the hologram to be formed.2. The method according to claim 1 , whereinbased on the established three-dimensional model, calculating the luminous characteristics of each voxel of the three-dimensional model at various azimuth angles within the viewing angle range of the hologram to be formed with a bidirectional reflection distribution function (BRDF);or, calculating the luminous characteristics of each voxel of the three-dimensional model of the object at various azimuth angles within the viewing angle range ...

Volume hologram sheet to be embedded, forgery prevention paper, and card

An object of the present invention is to provide a thin volume hologram sheet to be embedded sufficiently resistant to a mechanical stress such as a stress including a tensile stress, a shear stress and a compression stress at the time of processing even under a heating condition, a forgery prevention paper and a card using the same. The object is achieved by providing a volume hologram sheet to be embedded comprising a volume hologram layer, and a substrate disposed only on one side surface of the volume hologram layer using an adhesion means, wherein a peeling strength of the volume hologram layer and the substrate is 25 gf/25 mm or more.

MARKING METHOD AND SYSTEM

A method and system for forming a holographic structure in a material. The holographic structure is configured to project a selected target image in the far field under illumination of the holographic structure by a laser. The method calculates a modified design for the holographic structure that encodes a unique identifier within the holographic structure for projecting the target image. The method modifies the material by mapping features corresponding to the modified design into the material so as to form the holographic structure. A basic check of the authenticity of the material is performed by checking whether a projected replica of the target image is as expected. A more detailed check of the authenticity of the material is performed by directly inspecting the features in the holographic structure. 142-. (canceled)43. A method for forming a holographic structure in a material , the holographic structure being configured to project a target image in the far field under illumination of the holographic structure , the method comprising:calculating a design for the holographic structure for projecting the target image;modifying the design to encode an identifier within the holographic structure for projecting the target image; andmodifying the material by mapping features corresponding to the modified design into the material.44. The method of claim 43 , wherein the identifier encoded by the modified design is such that the identifier is substantially hidden claim 43 , masked or otherwise substantially unidentifiable in the projected target image.45. The method of claim 43 , wherein at least one of calculating and/or modifying the design comprises using the identifier as part of an algorithm to calculate the modified design.46. The method of claim 43 , wherein calculating the design comprises calculating a map of phase and/or amplitude values for projecting the target image claim 43 , wherein each feature of the design corresponds to one of the phase and/or ...

ILLUMINATION DEVICE FOR VEHICLES

A hologram for an illumination device for vehicles and a corresponding illumination device are provided. The hologram has a plurality of holographic structures designed for a respectively associated wavelength, wherein the holographic structures have diffraction properties that are identical among one another. 1. A hologram for an illumination device for vehicles , comprising a plurality of superimposed holographic structures , wherein each of the plurality of holographic structures for a respectively associated reconstruction wavelength has identical diffraction directions for the reconstruction of an extensive holographic object , wherein the associated reconstruction wavelengths are different.2. The hologram as claimed in claim 1 , wherein each of the plurality of superimposed holographic structures for an image point of the holographic object locally has an associated group of Bragg planes claim 1 , wherein the Bragg planes of different groups which are associated with the image point are locally parallel to one another and have distances corresponding to the respectively associated reconstruction wavelengths within each group.3. The hologram as claimed in claim 1 , wherein a thickness of an active layer of the hologram is greater than 50 μm.4. The hologram as claimed in claim 3 , wherein the thickness is greater than or equal to 140 μm.5. The hologram as claimed in claim 1 , wherein values of full width at half maximum for diffraction efficiencies associated with the wavelengths overlap at least for some of the wavelengths.6. The hologram as claimed in claim 1 , wherein at least three of the reconstruction wavelengths lie in a wavelength interval of 50 nm.7. The hologram as claimed in claim 6 , wherein the at least three of the reconstruction wavelengths lie in a wavelength interval of 25 nm.8. The hologram as claimed in claim 1 , wherein the plurality of superimposed holographic structures comprises more than three holographic structures.9. The hologram as ...

ULTRA-THIN COLOR PHASE HOLOGRAM WITH METASURFACES

A device for producing a subwavelength hologram. The device comprises a metasurface layer attached to a substrate. The metasurface layer includes an array of plasmonic antennas that simultaneously encode both wavelength and phase information of light directed through the array to produce a hologram. The wavelength is determined by the size of the antennas, and the phase is determined by the orientation of the antennas. 1. A method of making a device comprising:forming a metasurface layer over a transparent substrate, wherein the metasurface layer comprises an array of plasmonic antennas, wherein each array of plasmonic antennas of the arrays of plasmonic antennas comprises openings.2. The method of making the device of claim 1 , further comprising the metasurface layer having a thickness ranging from 5 nanometers to 100 nanometers.3. The method of making the device of claim 1 , further comprising each plasmonic antenna of the array of plasmonic antennas having a width of approximately 30 nanometers and a length ranging from 20 nanometers to 200 nanometers.4. The method of making the device of claim 1 , wherein the openings comprise rectangular openings.5. The method of making the device of claim 1 , wherein the openings comprise elliptic openings.6. The method of making the device of claim 1 , wherein the antennas are anisotropic.7. The method of making the device of claim 1 , wherein the orientation of the antennas is configured to control said phase information.8. The method of making the device of claim 1 , wherein an entirety of an opening of the openings is through a single metasurface layer.9. A method of making a device comprising:forming a metasurface layer over a transparent substrate, wherein the metasurface layer comprises an array of plasmonic antennas, wherein each array of plasmonic antennas of the arrays of plasmonic antennas comprises an opening, wherein the opening comprises a rectangular opening.10. The method of making the device of claim 9 , ...

METHOD AND APPARATUS FOR CONVERTING RESOLUTION OF DIGITAL HOLOGRAM DATA

Provided is a method for converting a hologram resolution of an apparatus for converting a hologram resolution. The apparatus for converting a hologram resolution includes receiving a hologram data and determining a direction and a height of an envelope for the hologram data based on first information associated with the hologram data. The apparatus for converting a hologram resolution includes converting the resolution of the hologram data from a first resolution into a second resolution based on the envelop having the determined direction and height. 1. A method for converting a hologram resolution of an apparatus for converting a hologram resolution , comprising:receiving a hologram data;determining a direction and a height of an envelope for the hologram data based on first information associated with the hologram data; andconverting the resolution of the hologram data from a first resolution into a second resolution based on an envelope having the determined direction and height.2. The method of claim 1 , wherein:the determining of the direction and height of the envelope for the hologram data includesdetermining the direction and height of the envelope as a first candidate value based on the first information;applying a first resolution conversion based on the envelope to which the first candidate value is applied to the hologram data having the first resolution; andrestoring a first image based on a numerical restoration for the hologram data to which the first resolution conversion is applied.3. The method of claim 2 , wherein:the determining of the direction and height of the envelope for the hologram data further includesrestoring a second image based on a numerical restoration for the hologram data having the first resolution; andchanging the direction and height of the envelope from the first candidate value to a second candidate value based on a correlation between the first image and the second image.4. The method of claim 2 , wherein:the applying of ...

Oaslm-based holographic display

Provided is an optically addressable spatial light modulator (OASLM)-based holographic display and a method of operating the same. The display includes an addressing unit including a light source unit emitting a plurality of recording beams, a driving mirror array including driving mirrors that each reflect a recording beam incident thereon, and a mirror member array including mirror members that each obliquely reflect a recording beam incident thereon, in which each of the driving mirrors corresponds to one of the mirror members. The recording beams, which are transmitted by the addressing unit, are focused onto the OASLM by micro lenses of a lenslet array. The OASLM is optically addressed by the recording beams focused by the micro lenses of the lenslet array and thus modulates and diffracts a reproduction beam, incident thereon from a reproduction beam providing unit, and thus a holographic image is reproduced.

SYSTEMS AND METHODS FOR CONTROLLING ELECTROMAGNETIC RADIATION

Systems and methods for controlling optical amplitude and phase of incident electromagnetic are provided, wherein an exemplary system comprises a substrate and a plurality of meta units, attached to the top surface of the substrate and configured to convert the incident electromagnetic radiation into a target electromagnetic radiation by modifying both optical amplitude and phase. 1. A system for controlling an optical amplitude and an optical phase of incident electromagnetic radiation , comprising:a substrate; anda plurality of meta units, attached to a top surface of the substrate and configured to convert the incident electromagnetic radiation into a target electromagnetic radiation by modifying both optical amplitude and phase.2. The system of claim 1 , wherein the electromagnetic radiation is a circularly polarized electromagnetic radiation of one handedness.3. The system of claim 2 , wherein the electromagnetic radiation is a left circularly polarized electromagnetic radiation or a right circularly polarized electromagnetic radiation.4. The system of claim 1 , wherein the target electromagnetic radiation is a polarized electromagnetic radiation with a predetermined polarization state.5. The system of claim 1 , wherein each of the plurality of meta-units has different degree of a birefringence and/or a rotation angle to form a dielectric metasurface.6. The system of claim 5 , wherein the optical amplitude is altered by modifying a degree of the birefringence.7. The system of claim 5 , wherein the optical phase is altered by modifying a degree of the orientation angle.8. The system of claim 7 , wherein a range of the degree of the orientation angle is from about 0° to about 180°.9. The system of claim 1 , further comprising a filter claim 1 , wherein the filter is configured to select the target electromagnetic radiation and absorb a non-target electromagnetic radiation.10. The system of claim 1 , wherein the system generates a two- or a three-dimensional ...

Multilayer film and authentication label

In a first aspect, a multilayer film includes a holographic image layer, a first heat-shrinkable layer and a first adhesive layer between the holographic image layer and the first heat-shrinkable layer. In a second aspect, an authentication label includes a holographic image layer, a first heat-shrinkable layer, a first adhesive layer between the holographic image layer and the first heat-shrinkable layer, and a back adhesive layer.

Holographic viewing device, and holographic viewing card incorporating it

The invention relates to a holographic viewing device that enable printing or the like to be directly applied to a transmission hologram substrate without recourse to any frame for supporting and reinforcing a transmission hologram, thereby simplifying construction while enhancing aesthetic and decorative attributes, and a holographic viewing card incorporating it. The holographic viewing device enables a given image or message to be viewed near the positions of point light sources upon viewing the point light sources through a hologram, and comprises a transparent substrate 41 , a hologram-formation layer 42 and a printing layer 45 . The hologram-formation layer 42 may be any one of a phase type diffractive optical element having a relief structure 43 on its surface, a phase type diffractive optical element having a refractive index profile in its layer, and an amplitude type diffractive optical element having a transmittance profile in its layer.

ACTIVE COMPLEX SPATIAL LIGHT MODULATION METHOD AND APPARATUS FOR AN ULTRA-LOW NOISE HOLOGRAPHIC DISPLAY

Disclosed are an active complex spatial light modulation method and apparatus for an ultra-low noise holographic display. The active complex spatial light modulation apparatus includes a substrate and a petal antenna including three petal patterns arranged on the substrate, dividing a complex plane into three phase sections, and modulating the input light into three-phase amplitude values corresponding to the phase sections. The petal antenna may have a point symmetry shape based on the center point of the petal antenna. 1. An active complex spatial light modulation apparatus for an ultra-low noise holographic display , the apparatus comprising:a substrate; anda petal antenna comprising three petal patterns arranged on the substrate, dividing a complex plane into three phase sections, and modulating the input light into three-phase amplitude values corresponding to the phase sections,wherein the petal antenna has a point symmetry shape based on a center point of the petal antenna.2. The apparatus of claim 1 , wherein:the petal patterns intersect at the center point, andeach of the petal patterns has a point symmetry shape based on the center point.3. The apparatus of claim 2 , wherein the petal patterns are mutually tilted by 120°.4. The apparatus of claim 1 , wherein each of the petal patterns comprises at least two petal elements arranged in a point symmetry form based on the center point.5. The apparatus of claim 4 , wherein at least any two of the petal elements are interconnected at the center point.6. The apparatus of claim 4 , wherein at least two of the petal elements are spaced apart from each other with the center point interposed between the at least two petal elements.7. The apparatus of claim 1 , wherein each of the amplitude values is adjusted based on at least any one of a width or length of each of the petal patterns.8. An operating method of an active complex spatial light modulation apparatus for an ultra-low noise holographic display claim 1 , the ...

Method and system for pixel super-resolution of multiplexed holographic color images

A method of generating a color image of a sample includes obtaining a plurality of low resolution holographic images of the sample using a color image sensor, the sample illuminated simultaneously by light from three or more distinct colors, wherein the illuminated sample casts sample holograms on the image sensor and wherein the plurality of low resolution holographic images are obtained by relative x, y, and z directional shifts between sample holograms and the image sensor. Pixel super-resolved holograms of the sample are generated at each of the three or more distinct colors. De-multiplexed holograms are generated from the pixel super-resolved holograms. Phase information is retrieved from the de-multiplexed holograms using a phase retrieval algorithm to obtain complex holograms. The complex hologram for the three or more distinct colors is digitally combined and back-propagated to a sample plane to generate the color image.

Resolutions by modulating both amplitude and phase in spatial light modulators

Architecture and designs of modulating both amplitude and phase at the same time in spatial light modulation are described. According to one aspect of the present invention, light propagation is controlled in two different directions (e.g., 0 and 45 degrees) to perform both amplitude modulation and phase modulation at the same time in liquid crystals. In one embodiment, a mask is used to form a pattern, where the pattern includes an array of alignment cells or embossed microstructures, a first group of the cells are aligned in the first direction and a second group of the cells are aligned in the second direction. Depending on applications, two cells from the first group and the second group may correspond to a single pixel or two neighboring pixels, resulting in amplitude modulation and phase modulation within the pixel or within an array of pixels.

Method for forming a high resolution image by lensless imaging

A device and method for forming an image of a sample includes illuminating the sample with a light source; acquiring a plurality of images of the sample using an image sensor, the sample being placed between the light source and the image sensor, no magnifying optics being placed between the sample and the image sensor, the image sensor lying in a detection plane, the image sensor being moved with respect to the sample between two respective acquisitions, such that each acquired image is respectively associated with a position of the image sensor in the detection plane, each position being different from the next; and forming an image, called the high-resolution image, from the images thus acquired.

Holographic display device

A holographic display device includes a backlight unit for emitting light and a spatial light modulator. The spatial light modulator includes a plurality of pixels and a color filter layer including a plurality of color filter groups. The pixels are arranged in a zigzag form and are configured to modulate at least one of the amplitude and phase of the light. Each of the color filter groups includes a first sub-group including a plurality of first color filters, a second sub-group including a plurality of second color filters, and a third sub-group including a plurality of third color filters, and each of the pixels is aligned with one of the first color filters, the second color filters, and the third color filters of the color filter layer.

Method for Producing a Holographic Optical Element

The invention relates to a method for producing a holographic optical element by providing a recording stack comprising at least one recording element laminated on at least one supporting element, irradiating at least a part of the recording stack with at least one recording beam in an irradiating step, wherein during the irradiating step, the recording stack bends, providing a bending deviation threshold for the recording stack, and adjusting at least one first process parameter such that an expected maximum bending deviation of the recording stack does not exceed the bending deviation threshold, wherein the at least one first process parameter influences the bending behaviour of the recording stack during the irradiating step.

Method of Operating a Display Driver

A method of operating a display device comprising a drive circuit is disclosed. The drive circuit comprises a plurality of single grey-level channels, each comprising an input (), an output () and a signal processor connected between the input and output. Each signal processor comprises a digital-to-analog converter () and an operational amplifier () having a voltage offset. The method comprises: converting a digital signal received at the input () into an analog voltage () at the output () using each respective signal processor; switching between the analog voltage () of each single grey-level channel using a switching circuit (); receiving and analysing the analog voltages () in a calibration subsystem (), and individually compensating for the voltage offset of each op-amp () based on the received analog voltage () for that grey-level channel using the calibration subsystem (). 125-. (canceled)26. A drive method for a display device comprising a drive circuit , the display device comprising a plurality of pixels operable at a plurality of grey levels in accordance with a respective plurality of analog drive voltages , the drive circuit comprising a plurality of single grey-level channels , wherein each single grey-level channel comprises an input , an output and a signal processor connected between the input and output , wherein each signal processor comprises a digital-to-analog converter , “DAC” , and an operational amplifier , “op-amp” , having a voltage offset , the method comprising:converting a digital signal received at the input into an analog voltage at the output using each respective signal processor;switchably-receiving the analog voltage of each single grey-level channel of the plurality of single grey-level channels using a switching circuit connected to the output of each single grey-level channel;receiving each analog voltage from the switching circuit; and individually determining the output response of each single grey-level channel to a ...

FABRICATION OF METALLIC OPTICAL METASURFACES

The disclosure provides a method for fabricating a metallic optical metasurface having an array of hologram elements. The method includes forming a first copper layer protected with a conducting or dielectric barrier layer over a backplane structure by a damascene process. The first copper layer comprises a plurality of nano-gaps vertically extending from the backplane structure. The plurality of nano-gaps is filled with a dielectric material. The method also includes removing the dielectric material and a portion of the conducting or dielectric barrier layer to expose the portions in the nano-gaps of the first copper layer. The method may further include depositing a dielectric coating layer over the top portion and exposed side portions of the first copper layer to form a protected first copper layer, and filling the gaps with an electrically-tunable dielectric material that has an electrically-tunable refractive index. 1. A method for fabricating a metallic optical metasurface having an array of hologram elements , comprising:forming a first copper layer with a conducting or dielectric barrier layer over a backplane structure by a damascene process, wherein the first copper layer comprises a plurality of nano-gaps vertically extending from the backplane structure, wherein the plurality of nano-gaps is filled with a dielectric material, wherein the conducting or dielectric barrier layer is between the first copper layer and the backplane structure, and also between the first copper layer and the dielectric material;removing the dielectric material and a portion of the conducting or dielectric barrier layer to expose the portions in the nano-gaps of the first copper layer;depositing a dielectric coating layer over the top portion and exposed side portions of the first copper layer to form a protected first copper layer; andfilling the gaps with an electrically-tunable dielectric material that has an electrically-tunable refractive index.2. The method of claim 1 , ...

System, method and apparatus for ultra-resolved ultra-wide field-of-view multispectral and hyperspectral holographic microscopy

There is disclosed a novel system and method for achieving ultra-resolution, ultra-wide field-of-view multispectral and hyperspectral holographic microscopy and quantitative phase contrast microscopy. In an embodiment, the method comprises: providing a stationary illumination source; acquiring a plurality of low-resolution holograms of an image subject from different locations utilizing a subpixel sensor-scanning synthetic aperture mechanism whereby a detector scanning translationally, radially and/or rotationally; processing the acquired holograms utilizing a processing algorithm corresponding to the scanning motion of the detector used to acquire the holograms; and reconstructing a subpixel ultra-resolution image of the image subject based on the processed holograms; whereby, a desired synthetic aperture is achieved without loss of resolution. The multispectral and hyperspectral aspect is achieved in the novel system and method by use of different combination of illumination sources (i.e., LEDs, laser sources, broadband lamps, etc.) and wavelength selection mechanisms (i.e., bandpass spectral filters, acousto-optical and liquid crystal tunable filters, a dispersing element, etc.).

Systems, devices, and methods for holographic optical elements

Systems, devices, and methods for holographic optical elements are described. A holographic optical element includes a first layer of holographic material and a second layer of holographic material. The first layer of holographic material includes a first hologram responsive to light in a first waveband and a second hologram responsive to light in a second waveband. The second layer of holographic material includes a third hologram responsive to light in a third waveband and may include a fourth hologram responsive to light in a fourth waveband. The first, second, third, and fourth wavebands are distinct and may comprise light of red, blue, green, and infrared wavelengths, respectively. Distribution of the three or four holograms on two layers of holographic material allows each hologram to have an index modulation of greater than 0.016, a diffraction efficiency of greater than 15%, and an angular bandwidth of greater than 12°.

Fabrication of optical metasurfaces

The method is provided for fabricating an optical metasurface. The method may include depositing a conductive layer over a holographic region of a wafer and depositing a dielectric layer over the conducting layer. The method may also include patterning a hard mask on the dielectric layer. The method may further include etching the dielectric layer to form a plurality of dielectric pillars with a plurality of nano-scale gaps between the pillars.

Holographic display apparatus and display method for the same

A holographic display apparatus and a display method thereof are disclosed. The holographic display apparatus includes: a backlight source configured to supply a coherent reference light; an optical switch configured to modulate light wave amplitude information of the coherent reference light; and a phase control plate configured to modulate light wave phase information of the coherent reference light, wherein the phase control plate and the optical switch are arranged on a light exit side of the backlight source.

Light field display system for cinemas

A light filed (LF) display system for displaying holographic content (e.g., a holographic film or holographic content to augment a film) to viewers in a cinema. The LF display system in the cinema includes LF display modules tiled together to form an array of LF modules. The array of LF modules create a holographic object volume for displaying the holographic content in the cinema. The array of LF modules displays the holographic content to viewers in viewing volumes. The LF display system can be included in a LF film network. The LF film network allows holographic content to be created at one location and presented at another location. The LF film network includes a network system to manage the digital rights of the holographic performance content.

IMAGING SYSTEMS AND METHODS OF USING THE SAME

Method and system for lensless, shadow optical imaging. Formation of a hologram shadow image having higher spatial resolution and lower noise level is accomplished by processing image information contained in multiple individual hologram shadow image frames acquired either under conditions of relative shift between point light source and the detector of the system or under stationary conditions, when system remains fixed in space and is devoid of any relative movement during the process of acquisition of individual image frames. 1. A shadow optical imaging method comprising:receiving, at a single detector of a lensless optical imaging system, an optical shadow cast thereon by an object disposed in immediate proximity to said single detector and irradiated with a single diverging monochromatic wavefront of light produced by a light source,wherein said wavefront of light has an axis;acquiring multiple sets of optical data with said single detector over a period of time, each set of optical data representing a respectively-corresponding first image of said optical shadow formed with said wavefront at a respectively-corresponding point in time within said period in absence of a relative movement of any of the light source, the object, and the single detector along the axis,wherein a first spatial position of at least one of said detector, said object, and said light source is different from a second spatial position of at least one of said detector, said object, and said light source, the first spatial position defined at a first point in time within said period, the second spatial position defined at a second point in time within said period;wherein said first image is characterized by first spatial resolution;from said multiple sets of optical data, forming a second image of said object with a computer processor by minimizing a cost-function that at least partially represents a degree of blurring of each first image,wherein said second image is characterized by second ...

Method for Producing a Holographic Optical Element

The invention relates to a method for producing a holographic optical element by providing a recording stack comprising at least one recording element laminated on at least one supporting element, irradiating at least a part of the recording stack with at least one recording beam in an irradiating step, wherein during the irradiating step, the recording stack bends, providing a bending deviation threshold for the recording stack, and adjusting at least one first process parameter such that an expected maximum bending deviation of the recording stack does not exceed the bending deviation threshold, wherein the at least one first process parameter influences the bending behaviour of the recording stack during the irradiating step. 1. A method for producing a holographic optical element from a photopolymeric recording medium , comprising:providing a substantially flat recording stack comprising at least one recording element that includes a photopolymeric material laminated on at least one supporting element,irradiating at least a part of the substantially flat recording stack with at least one recording beam in an irradiating step resulting in the recording stack bending,determining a bending deviation threshold for the recording stack, the bending deviation threshold chosen or determined through experimentation or calculation; and{'sub': 'max', 'adjusting at least one first process parameter such that a maximum bending deviation ξof the recording stack does not exceed the bending deviation threshold, wherein the at least one first process parameter influences the bending behavior of the recording stack during the irradiating step, and'}{'sub': dim', 'exp', 'exp, 'wherein the first process parameter is a ratio Rof lateral dimensions of the recording stack to a thickness of the recording stack, a coefficient of thermal expansion (CTE) of the recording stack, a fill factor of a recording element area versus a supporting element area, exposure time tat a fixed recording ...

MASKLESS IMAGING OF DENSE SAMPLES USING MULTI-HEIGHT LENSFREE MICROSCOPE

A method of imaging includes illuminating a sample spaced apart from an image sensor at a multiple distances. Image frames of the sample obtained at each distance are registered to one another and lost phase information from the registered higher resolution image frames is iteratively recovered. Amplitude and/or phase images of the sample are reconstructed based at least in part on the recovered lost phase information. 114-. (canceled)15. A system for imaging objects within a sample comprising:an image sensor;an illumination source configured to scan along a surface relative to the image sensor and illuminate the sample at a plurality of different locations;a sample interposed between the image sensor and the illumination source;means for adjusting an actual or effective distance between the sample and the image sensor; andat least one processor configured to reconstruct an image of the sample based on the images obtained from the illumination source at the plurality of different scan locations.16. The system of claim 15 , wherein the means for adjusting the actual distance between the sample and the image sensor comprises a moveable stage.17. The system of claim 15 , wherein the means for adjusting the actual distance between the sample and the image sensor comprises a plurality of inserts.18. The system of claim 15 , wherein the means for adjusting the effective distance between the sample and the image sensor comprises changing the illumination wavelength of the illumination source.19. The system of claim 15 , wherein the means for adjusting the effective distance between the sample and the image sensor comprises changing the refractive index of media or medium between the sample and the image sensor.20. The system of claim 15 , wherein the illumination source comprises one of an aperture or optical waveguide configured to direct light to the sample.21. The system of claim 20 , further comprising a mechanically scanning stage configured to move the at least one ...

Spatial deposition of resins with different functionality on different substrates

Techniques disclosed herein relate to optical devices. Resins with different optical properties can be deposited in different areas to provide increased optical functionality. It can be difficult to design a single photopolymer material that meets several technical requirements. Different resins can be deposited on the same substrate to make a single film with spatially varying properties. Different resins can also be applied to different substrates in a stack. By using different resins, an optical component can be made that meets several technical requirements.

Spatial deposition of resins with different functionality

Techniques disclosed herein relate to optical devices. Resins with different optical properties can be deposited in different areas to provide increased optical functionality. It can be difficult to design a single photopolymer material that meets several technical requirements. Different resins can be deposited on the same substrate to make a single film with spatially varying properties. Different resins can also be applied to different substrates in a stack. By using different resins, an optical component can be made that meets several technical requirements.

Method of displaying a hologram on a display device comprising pixels

There is provided a holographic projector comprising a hologram engine and a controller. The hologram engine is arranged to provide a hologram comprising a plurality of hologram pixels. Each hologram pixel has a respective hologram pixel value. The controller is arranged to selectively-drive a plurality of light-modulating pixels so as to display the hologram. Displaying the hologram comprises displaying each hologram pixel value on a contiguous group of light-modulating pixels of the plurality of light-modulating pixels such that there is a one-to-many pixel correlation between the hologram and the plurality of light-modulating pixels.

THIN FILM OPTICS

A method of manufacturing a thin film optical apparatus includes providing a substrate and applying an alignment layer over the substrate. The alignment layer ranges from about 50 to 100 nm in thickness. The method includes imprinting a hologram with a desired optic pattern onto the alignment layer and applying at least one layer of mesogen material over the alignment layer. 1. A method of manufacturing a thin film optical apparatus , the method comprising:providing a substrate;applying an alignment layer over the substrate, wherein the alignment layer ranges from about 50 to 100 nm in thickness;imprinting a hologram with a desired optic pattern onto the alignment layer; andapplying at least one layer of mesogen material over the alignment layer.2. The method of claim 1 , further comprising curing and polymerizing the mesogen layer.3. The method of claim 1 , wherein the applying the layer of mesogen material comprises spin coating the layer of mesogen material onto the alignment layer and aligning the layer of mesogen material over the alignment layer.4. The method of claim 1 , wherein the alignment layer comprises a thin layer having a magnitude of one half of a wavelength or less.5. The method of claim 1 , wherein the imprinting the hologram onto the alignment layer comprises producing a hologram with a desired optic pattern by setting up a desired wavefront in a holographic interferometer.6. The method of claim 5 , wherein producing the hologram with a desired optic pattern comprises imparting a geometric phase utilizing a polarization based holographic interferometer.7. The method of claim 6 , wherein imparting the geometric phase comprises converting a binary amplitude hologram to a phase hologram.8. The method of claim 6 , wherein the polarization based holographic interferometer comprises a Mach-Zehnder interferometer.9. The method of claim 5 , wherein producing the hologram with a desired optic pattern comprises rastering an incident light beam with phase ...

METHOD AND SYSTEM FOR PIXEL SUPER-RESOLUTION OF MULTIPLEXED HOLOGRAPHIC COLOR IMAGES

A method of generating a color image of a sample includes obtaining a plurality of low resolution holographic images of the sample using a color image sensor, the sample illuminated simultaneously by light from three or more distinct colors, wherein the illuminated sample casts sample holograms on the image sensor and wherein the plurality of low resolution holographic images are obtained by relative x, y, and z directional shifts between sample holograms and the image sensor. Pixel super-resolved holograms of the sample are generated at each of the three or more distinct colors. De-multiplexed holograms are generated from the pixel super-resolved holograms. Phase information is retrieved from the de-multiplexed holograms using a phase retrieval algorithm to obtain complex holograms. The complex hologram for the three or more distinct colors is digitally combined and back-propagated to a sample plane to generate the color image. 122-. (canceled)23. A method of generating a color image of a sample comprising:obtaining a plurality of low resolution holographic images of the sample using a color image sensor, the sample illuminated simultaneously by light containing multiple wavelengths or colors, wherein the illuminated sample casts sample holograms on the color image sensor and wherein the plurality of low resolution holographic images are obtained by relative shifts in the x, y, and z direction between the sample holograms at a given axial plane and the color image sensor, wherein at least one lens, lens set, or lens module is located along an optical path between the sample and color image sensor;generating a pixel super-resolved hologram of the sample using the plurality of low-resolution holographic images obtained by simultaneous illumination of the sample by light from the multiple wavelengths or colors;generating de-multiplexed pixel super-resolved holograms at individual wavelengths or colors using the pixel super-resolved hologram obtained from the ...

BACKLIGHT DEVICE, HOLOGRAPHIC DISPLAY INCLUDING THE SAME, AND METHOD OF MANUFACTURING HOLOGRAPHIC OPTICAL ELEMENT HAVING A MULTILAYERED STRUCTURE

A backlight device having a light guide, a first holographic optical element and a second holographic element are provided. The light guide plate guides light emitted by a light source towards the first holographic optical element. The first holographic optical element, which has a multi-layered structure, is provided on a first side of the light guide plate and reflects the light according to the wavelength ranges based on the characteristics of the multi-layered structure. The second holographic optical element, which concentrates light reflected by the first holographic optical element onto at least two points is provided on a second side of the light guide plate perpendicular to the first side. 1. A method of manufacturing a holographic optical element , the method comprising:attaching a first layer to a substrate;dividing the first layer into a plurality of areas and sequentially recording holograms by using light of a first color;attaching a second layer to the first layer; andrecording holograms on the second layer by using light of a second color and light of a third color.2. The method of claim 1 , further comprising performing pre-exposure on the first layer by using a light source that has a low coherence. This application is a Divisional application of U.S. application Ser. No. 15/691,091, filed Aug. 30, 2017, which claims priority from Korean Patent Application No. 10-2016-0150336, filed on Nov. 11, 2016 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.Exemplary embodiments relate to a backlight device for displaying holographic three-dimensional (3D) images, a holographic display that includes the backlight device, and a method of manufacturing a holographic optical element.As many 3D films have recently been released, much research has been carried out on technology related to apparatuses for displaying 3D images. Well-known methods of forming 3D images include a stereoscopic ...

Verwendung eines packbands als holographischer datenträger

Ein Packband (3), das eine Polymerfolie aufweist, wird als holographischer Datenträger verwendet. Dabei ist das Packband (3) zum Speichern von holographischer Information eingerichtet. Holographische nformation kann mit Hilfe einer Schreibeinrichtung (4) in das Packband (3) eingegeben werden, bevor ein Gegenstand (1) unter Benutzung des Packbands (3) verpackt wird, aber auch hinterher.

Use of a packaging strip as a holographic data carrier

A packaging tape ( 3 ) which comprises a polymer film is used as a holographic data carrier. The packaging tape ( 3 ) is set up for the storage of holographic information. Holographic information can be put into the packaging tape ( 3 ) with the aid of a writing device ( 4 ), before an object ( 1 ) is packaged by using the packaging tape ( 3 ), but also afterwards.

Controllable device for phase modulation

Es soll eine steuerbare Einrichtung zur Phasenmodulation von kohärentem Licht mit Modulatorzellen aus Flüssigkristall-Molekülen geschaffen werden, mit der eine große Anzahl von Phasenstufen pro Modulatorzelle realisiert werden kann und deren Schaltzeit unter 1 ms liegt. Die Einrichtung zur Phasenmodulation umfasst einen räumlichen Lichtmodulator mit einer Modulatormatrix aus regulär angeordneten steuerbaren LC Modulatorzellen, ein Lichtquellenmittel zum Beleuchten der Modulatormatrix sowie Steuermittel zum Steuern des Phasenmodulation in den LC-Modulatorzellen. Die Aufgabe wird gelöst, indem - die Modulatormatrix mit einer Konfiguration aus einer ansteuerbaren lambda/42 Platte zwischen zwei nicht ansteuerbaren lambda/4 Platten ausgebildet ist, - die steuerbaren LC-Modulatorzellen vom PSS-Flüssigkristalltyp sind, - jede LC-Modulatorzelle je nach einzuschreibenden Phasenwerten lokal mit einem positiven oder negativen Spannungswert ansteuerbar ist und - die Steuermittel einen globalen festen Phasen-Versatz in den einzuschreibenden Phasenwerten in jedem zweiten Bildinhalterneuerungsintervall generieren. Anwendungsgebiet der Erfindung sind kohärent-optische Anwendungen zur dreidimensionalen Bilddarstellung. It is intended to provide a controllable device for phase modulation of coherent light with modulator cells made of liquid crystal molecules, with which a large number of phase stages per modulator cell can be realized and whose switching time is less than 1 ms. The phase modulation device comprises a spatial light modulator with a modulator array of regularly arranged controllable LC modulator cells, a light source means for illuminating the modulator matrix and control means for controlling the phase modulation in the LC modulator cells. The object is achieved in that: -the modulator matrix is designed with a configuration of a controllable lambda / 42 plate between two non-controllable λ / 4 plates, -the controllable LC modulator cells are of the PSS liquid-crystal ...

Display device

The liquid crystal display device according to this invention realizes three-dimensional picture images without using lenticular lenses etc. In addition, this liquid crystal display device has a transparent picture screen so that remote display picture images or three-dimensional picture images of high luminance are seen multiplexed with the background. The display device is constructed by arranging picture elements in which volume-phase type holograms are formed by a periodical construction of liquid crystals and polymers. Diffraction light from first picture element groups which are distributed uniformly reaches a left eye of an observer while diffraction light from second picture element groups which are distributed uniformly reaches a right eye of an observer. The condition of the picture elements are switched to diffract irradiated light or to transmit the light, thus a desired picture image comprising a dot matrix can be displayed. The first picture element groups display parallax picture for the left eye, and the second picture element groups display parallax picture for the right eye.

In-line holographic mask for micromachining

An optically made, high-efficiency in-line holographic mask (ILHM) for patterning a workpiece and apparatus and methods for performing same. The ILHM (32) combines the functions of a lens and amplitude mask to obviate the need for projection optics. The ILHM is formed using either a non-opaque (MI) or opaque (MII) object mask having transparent regions which can be phase altering, scattering, refracting and/or diffracting. One method of the invention is illuminating an ILHM to impart a pattern on a workpiece (40). Another method is patterning a workpiece using an ILHM in combination with a lens. Using the ILHM, a holographic real image is disposed at or near the lens image plane. Exposure apparatus (10) for workpieces using ILHMs are also disclosed.

System and method for replicating volume holograms

The present invention offers increased efficiency and quality in the duplication of a master hologram utilizing an improved method of contact printing. This improved method of contact printing employs a polymer-dispersed liquid crystal (PDLC) recording medium as the duplication blank and/or the master hologram material. The optical qualities of the PDLC material described herein provide an improved method of duplication using single beam contact printing regardless of the material comprising the master hologram. Thus, master holograms originally recorded using highly complex optical geometries (e.g., computer generated holograms) are capable of duplication without the need for multiple beam power/intensity balancing and long recording times. The improved hologram contact printing method described herein works with virtually any type of master hologram, including both reflection and transmission holograms.

Increasing an area from which reconstruction from a computer generated hologram may be viewed

hologram

Apparatus for copying a hologram

A holographic recording apparatus comprises: a source of illumination (2); a master hologram (1) containing at least one hologram lamina (20) overlaying; a copy substrate (50) containing a holographic recording medium; and a voltage generator (40) for applied a voltage across at least one of said master hologram and said copy substrate. The master hologram diffracts the illumination light (100) into zero order light (102, 104) and diffracted light (101, 103) which interfere in the copy substrate to form a copy of the master hologram. The source of illumination is applied for a predefined exposure time during which the voltage varies the refractive index modulation of at least one of the master hologram and the copy hologram.

液晶显示器的照明设备

本发明涉及一种用于照明液晶显示器的至少一个光调制器装置(6)的照明设备(4)，包括至少一个光导体基底(8)，用于引导至少一个可耦合到所述光导体基底(8)内的、定向的光束(40)，其中，所述光导体基底(8)与至少一个包括多个输出耦合区域(12)的全息‑光学输出耦合基底(10)至少处于光学接触，其中，一个输出耦合区域(12)至少被设置为，用于将一部分所述定向的光束(40)以多个子光束(42，44)的形式向着所述光调制器装置(6)的方向输出耦合，其中，设置至少一个扩散器模块(14，58)，其中，所述扩散器模块(14，58)被这样设置，使得两个相邻输出耦合区域(12)的至少最外面的子光束(46，48)在从所述扩散器模块(14，58)输出之前至少相互紧邻。

Computer generated hologram, generation method, and exposure apparatus

Hologram

A hologram includes an optically transparent base plate having first and second opposite surfaces. A hologram element is provided on the first surface of the base plate, and has a predetermined holographic pattern. An optically transparent member has first and second opposite surfaces. The first surface of the member faces the hologram element. An arrangement serves to prevent light, which successively passes through the transparent base plate, the hologram element, and the member and is then reflected at a boundary between the second surface of the member and an atmosphere, from travelling back to the hologram element.

A system and method for replicating volume holograms

The present invention offers increased efficiency and quality in the duplication of a master hologram using contact printing methods using a single laser beam (33) from a single laser source (31). The improvement uses a polymer dispersed liquid crystal (PDLC) recording medium as the duplication blank (35) and/or the master hologram (37). The optical qualities of the PDLC recording medium allows the recording of highly complex optical patterns, such as computer generated hologram, without the need for multiple beam power/intensity balancing or long recording times. The contact printing method allows the recording of transmission hologram as well as the duplication of reflection holograms as shown in figure 4.

System and method for replicating volume holograms

The present invention offers increased efficiency and quality in the duplication of a master hologram utilizing an improved method of contact printing. This improved method of contact printing employs a polymer-dispersed liquid crystal (PDLC) recording medium as the duplication blank and/or the master hologram material. The optical qualities of the PDLC material described herein provide an improved method of duplication using single beam contact printing regardless of the material comprising the master hologram. Thus, master holograms originally recorded using highly complex optical geometries (e.g., computer generated holograms) are capable of duplication without the need for multiple beam power/intensity balancing and long recording times. The improved hologram contact printing method described herein works with virtually any type of master hologram, including both reflection and transmission holograms.

光情報記録媒体およびその記録方法と製造方法

【課題】 簡便に高い情報密度で記録できかつ耐久性にも優れた光情報記録媒体を低コストで提供する。 【解決手段】 光情報記録媒体は、基板（１）上に堆積されたダイアモンド・ライク・カーボン（ＤＬＣ）層（２）を含み、この光情報記録媒体への情報の記録は複数の記録スポット領域のうちの選択された記録スポット領域にエネルギビーム（５）を照射してその記録スポット領域におけるＤＬＣ層（２）の屈折率を高めることによって行われ得る。 【選択図】 図１

Backlight device, holographic display including the same, and method of manufacturing holographic optical element having a multilayered structure

A backlight device having a light guide, a first holographic optical element and a second holographic element are provided. The light guide plate guides light emitted by a light source towards the first holographic optical element. The first holographic optical element, which has a multi-layered structure, is provided on a first side of the light guide plate and reflects the light according to the wavelength ranges based on the characteristics of the multi-layered structure. The second holographic optical element, which concentrates light reflected by the first holographic optical element onto at least two points is provided on a second side of the light guide plate perpendicular to the first side.

Holographic optical device and manufacturing method therefor

Light field display system for cinemas

A light filed (LF) display system for displaying holographic content (e.g., a holographic film or holographic content to augment a film) to viewers in a cinema. The LF display system in the cinema includes LF display modules tiled together to form an array of LF modules. The array of LF modules create a holographic object volume for displaying the holographic content in the cinema. The array of LF modules displays the holographic content to viewers in viewing volumes. The LF display system can be included in a LF film network. The LF film network allows holographic content to be created at one location and presented at another location. The LF film network includes a network system to manage the digital rights of the holographic performance content.

Method for producing a holographic optical element

Die Erfindung betrifft ein Verfahren zum Erzeugen eines holographisch, optischen Elements (13). Hierbei wird zunächst ein lichtdurchlässiges Trägersubstrat (6) und eine, auf einer Oberfläche des Trägersubstrats (6) angeordnete Schicht aus einem holographischen Material (8) bereitgestellt. Darauf folgend wird wenigstens ein Teilbereich (28) der Schicht aus dem holographischen Material (8) mit Lichtstrahlen (20, 21, 22, 23, 24, 25) wenigstens drei unterschiedlicher Wellenlängen derart belichtet, dass in dem wenigstens einen belichteten Teilbereich (28) der Schicht (8) abhängig von der Wellenlänge der Lichtstrahlen (20, 21, 22, 23, 24, 25) Hologrammstrukturen erzeugt werden. Bei dem Belichten des wenigstens einen Teilbereiches (28) der Schicht (8) wird ein Einstrahlwinkel (α1, α2, α3) eines jeweiligen Objektstrahls (20, 21, 22) der Lichtstrahlen (20, 21, 22, 23, 24, 25) unterschiedlicher Wellenlänge größer 50°, insbesondere zwischen 50° und 80°, gewählt. Der Einstrahlwinkel (α1, α2, α3) ist hierbei zwischen einer Flächennormalen (15) der Schicht aus dem holographischen Material (8) und dem Objektstrahl (20, 21, 22) eingeschlossen. Der wenigstens eine Teilbereich (29) der Schicht aus dem holographischen Material (8) wird zeitlich hintereinander mit den Lichtstrahlen (20, 21, 22, 23, 24, 25) unterschiedlicher Wellenlänge belichtet. Hierbei wird mit dem Lichtstrahl (20, 21, 22, 23, 24, 25) begonnen, welcher die größte Wellenlänge aufweist. The invention relates to a method for producing a holographic optical element (13). In this case, a transparent carrier substrate (6) and a layer of a holographic material (8) arranged on a surface of the carrier substrate (6) are first provided. Subsequently, at least one sub-area (28) of the layer made of the holographic material (8) is exposed to light rays (20, 21, 22, 23, 24, 25) at least three different wavelengths in such a way that in the at least one exposed sub-area (28) the layer (8) depending on the wavelength of the light ...