CN107340704B - Holographic display device - Google Patents
Holographic display device Download PDFInfo
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- CN107340704B CN107340704B CN201710004635.2A CN201710004635A CN107340704B CN 107340704 B CN107340704 B CN 107340704B CN 201710004635 A CN201710004635 A CN 201710004635A CN 107340704 B CN107340704 B CN 107340704B
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- 230000003287 optical effect Effects 0.000 claims abstract description 53
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- 239000007788 liquid Substances 0.000 claims description 107
- 239000004973 liquid crystal related substance Substances 0.000 claims description 21
- 239000000758 substrate Substances 0.000 claims description 18
- 210000003644 lens cell Anatomy 0.000 claims description 13
- 230000002209 hydrophobic effect Effects 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 4
- 238000005286 illumination Methods 0.000 description 7
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- 238000009736 wetting Methods 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
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- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/10—Processes or apparatus for producing holograms using modulated reference beam
- G03H1/12—Spatial modulation, e.g. ghost imaging
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/12—Fluid-filled or evacuated lenses
- G02B3/14—Fluid-filled or evacuated lenses of variable focal length
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
- Geometry (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Holo Graphy (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
The present invention provides a holographic display device comprising: the spatial light modulator array structure comprises a plurality of sub-spatial light modulators which are arranged in an array, wherein different sub-spatial light modulators can be independently loaded with different holograms and can display the holograms in a time-sharing manner; a light source section for providing a light source for the spatial light modulator array structure, the light source section being disposed at one side of the spatial light modulator array structure; and an optical switch disposed between the light source component and the spatial light modulator array structure; the optical switch comprises a plurality of light transmission control areas which are in one-to-one correspondence with a plurality of sub-spatial light modulators, the light transmittance of each light transmission control area can be changed so as to control the light transmission state of each light transmission control area for transmitting light to the corresponding sub-spatial light modulator, and the light transmission state comprises a light transmission state and a light-tight state. The holographic display device provided by the invention solves the problem that when the spliced spatial light modulator array is adopted as a holographic display screen, a reconstruction light source influences the quality of a reconstruction holographic image.
Description
Technical Field
The invention relates to the technical field of display, in particular to a holographic display device.
Background
The spliced spatial light modulator array structure in the holographic reconstruction display equipment comprises a plurality of sub-spatial light modulators which are arranged in an array mode, and each sub-spatial light modulator can be independently loaded with different holograms and can display the holograms in a time-sharing mode.
In the prior art, in the holographic reconstruction display device using the tiled spatial light modulator, the reconstruction light sources may be the same reconstruction light source or different reconstruction light sources that are independently controlled according to the display state of the spatial light modulator. When the reconstruction light source is the same reconstruction light source, the reconstruction light source is always in an illumination state, so that when a certain sub-spatial light modulator does not display the holographic image at a certain moment, the reconstruction light source can penetrate through the sub-spatial light modulator, and the penetrating light beam can affect the viewing effect of the holographic reconstruction image for human eyes; when each sub-spatial light modulator corresponds to different independently controllable reconstruction light sources, the switch of the reconstruction light source is directly controlled, so that when a hologram is loaded on a certain sub-spatial light modulator at a certain moment, the corresponding reconstruction light source is lightened, and a process is required from lightening to stabilization due to light energy emitted by the light source, in the process, the quality of a holographic reconstruction image obtained by modulating an unstable reconstruction light beam by the hologram loaded on the sub-spatial light modulator is unstable, so that the effect of the holographic reconstruction image is poor.
Disclosure of Invention
The invention aims to provide a holographic display device which can solve the problem that when each sub-spatial light modulator in a spliced spatial light modulator array structure displays a hologram in a time-sharing mode, a reconstruction light source of the sub-spatial light modulator which does not display the hologram interferes with a holographic reconstruction image, and the image quality is reduced.
The technical scheme provided by the invention is as follows:
a holographic display device, comprising:
the spatial light modulator array structure comprises a plurality of sub-spatial light modulators which are arranged in an array, and different sub-spatial light modulators can be independently loaded with different holograms and displayed in a time-sharing manner;
a light source section for providing a light source for the spatial light modulator array structure, the light source section being disposed at one side of the spatial light modulator array structure;
and an optical switch disposed between the light source component and the spatial light modulator array structure;
the optical switch comprises a plurality of light transmission control areas which are in one-to-one correspondence with the plurality of sub-spatial light modulators, and the light transmittance of each light transmission control area can be changed so as to control the light transmission state of each light transmission control area for transmitting light to the corresponding sub-spatial light modulator, wherein the light transmission state comprises a light transmission state and a light-tight state.
Further, the optical switch includes:
the first transparent electrode and the second transparent electrode are oppositely arranged;
and a liquid crystal layer disposed between the first transparent electrode and the second transparent electrode;
wherein, first transparent electrode with at least one electrode in the second transparent electrode includes a plurality of first electrode pieces, and is a plurality of first electrode piece and a plurality of sub-spatial light modulator one-to-one sets up, with optical switch divides into a plurality ofly the printing opacity control area, every first electrode piece and relative electrode cooperation drive liquid crystal layer in the respective printing opacity control area that corresponds.
Further, the holographic display device further includes:
a controller for inputting control signals to the spatial light modulator array structure to drive each sub-spatial light modulator; the first transparent electrode and the second transparent electrode of the optical switch are connected with the controller, and the controller is further used for controlling each light transmission control area of the optical switch to be driven synchronously with the corresponding sub-spatial light modulator.
Further, the holographic display device further includes:
the light adjusting component is used for enabling the light emitted by the light source component to enter the spatial light modulator array structure after being adjusted to a preset state; the light ray adjusting component comprises a lens array structure, the lens array structure comprises a plurality of lens units which are arranged in an array, and the plurality of lens units and the plurality of sub-spatial light modulators are arranged in a one-to-one correspondence manner;
the lens array structure is a liquid lens array structure including a plurality of liquid lens cells.
Further, the liquid lens array structure includes:
the first transparent substrate and the second transparent substrate are oppositely arranged;
a fourth transparent electrode is arranged on the second transparent substrate, and the second transparent substrate comprises a first surface facing the sub-spatial light modulator;
a third transparent electrode disposed opposite to the fourth transparent electrode;
the partition layer is formed on the first surface and comprises a plurality of groove areas, the groove areas and the sub-spatial light modulators are arranged in a one-to-one correspondence mode, the partition layer is covered with a hydrophobic layer, first liquid is filled in the groove areas, and second liquid is filled between the first liquid and the first transparent electrodes;
the first liquid is a non-polar insulating liquid, the second liquid is a conductive or polar liquid, and the shape of a liquid interface formed between the first liquid and the second liquid can be changed according to different voltages applied to the third transparent electrode and the fourth transparent electrode, so that the focal length of the liquid lens unit can be adjusted.
Further, at least one of the third transparent electrode and the fourth transparent electrode includes a plurality of second electrode blocks, the plurality of second electrode blocks are disposed in one-to-one correspondence with the plurality of groove regions to divide the optical switch into the plurality of liquid lens units, and each of the second electrode blocks can be separately driven, so that the focal length of each of the liquid lens units can be separately adjusted;
or, the third transparent electrode and the fourth transparent electrode are both monolithic electrodes capable of covering the whole area corresponding to the spatial light modulator array structure, and the third transparent electrode and the fourth transparent electrode are respectively provided with a plurality of driving fields which are arranged in one-to-one correspondence with the plurality of grooves so as to form the liquid lens units, and each driving area can be driven independently, so that the focal length of each liquid lens unit can be adjusted independently.
Further, an insulating layer is formed between the hydrophobic layer and the second transparent substrate.
Further, the third transparent electrode and the fourth transparent electrode are connected with the controller, and the controller is further configured to control each liquid lens unit of the liquid lens array to be driven synchronously with the corresponding sub-spatial light modulator.
Further, the third transparent electrode and the second transparent electrode share the same electrode.
Further, the holographic display device further includes:
the optical deflection mechanism is used for adjusting the holographic beams emitted by each sub-spatial light modulator so as to deflect the holographic beams emitted by each sub-spatial light modulator to a preset display space and is arranged on one side, far away from the light source part, of the spatial light modulator array structure;
the plurality of sub-spatial light modulators comprises at least a first sub-spatial light modulator and a second sub-spatial light modulator; the optical deflecting mechanism includes at least:
the half mirror is arranged corresponding to the first sub-spatial light modulator and is inclined at a first inclination angle relative to the holographic light beam emitted by the first sub-spatial light modulator, and the half mirror can enable the holographic light beam emitted by the first sub-spatial light modulator to be transmitted to the preset display space;
and the reflector is arranged corresponding to the second sub-spatial light modulator, the reflector is obliquely arranged at a second inclination angle relative to the holographic light beam emitted by the second sub-spatial light modulator, and the reflector can enable the holographic light beam emitted by the second sub-spatial light modulator to enter the semi-transparent semi-reflecting mirror after being reflected by the reflector, and then to be emitted to the preset display space after being reflected by the semi-transparent semi-reflecting mirror.
The invention has the following beneficial effects:
the holographic display device provided by the invention is characterized in that an optical switch is arranged between the light source and the spliced spatial light modulator array, the optical switch is divided into a plurality of light-transmitting control areas corresponding to the sub-spatial light modulators, whether light beams of the light source pass or not can be controlled, the light source does not need to be changed, and the partitioned illumination of the spliced spatial light modulator array can be realized. When the sub-spatial light modulator loads the hologram, the light switch controls the light transmission control area corresponding to the sub-spatial light modulator to be in a light transmission state, so that the reconstruction light beam passes through, and the hologram is illuminated; when the sub-spatial light modulator is not loaded with the hologram, the corresponding light transmission control area is controlled to be in a light-tight state by the optical switch, so that the reconstruction light beam does not pass through, and the hologram is not illuminated. Therefore, the holographic display device provided by the invention can directly control the reconstruction light beams corresponding to each sub-spatial light modulator to pass or not pass through the optical switch without directly controlling the on-off of the light source, and solves the problem that the reconstruction light source influences the quality of the reconstruction holographic image when the spliced spatial light modulator is used as a holographic display screen.
Drawings
FIG. 1 is a schematic structural diagram of a holographic display device according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a holographic display device according to a second embodiment of the present invention;
fig. 3 is a schematic structural view of a holographic display device according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
The invention provides a holographic display device, which can effectively solve the problem that when each sub-spatial light modulator of a holographic display device adopting a splicing type spatial light modulator displays a hologram in a time-sharing manner in the prior art, a reconstruction light source generates interference on a holographic reconstruction image of the sub-spatial light modulator which does not display the hologram due to control of a light source switch, so that the image quality is reduced.
As shown in fig. 1 to 3, the holographic display device provided by the present invention includes:
the spatial light modulator array structure 100 comprises a plurality of sub-spatial light modulators 101 arranged in an array, wherein different sub-spatial light modulators 101 can independently load different holograms and display in a time-sharing manner;
a light source part 200 for providing a light source for the spatial light modulator array structure 100, the light source part 200 being disposed at one side of the spatial light modulator array structure 100;
and an optical switch 300 disposed between the light source part 200 and the spatial light modulator array structure 100;
the optical switch 300 includes a plurality of light transmission control regions that are arranged in one-to-one correspondence with the plurality of sub-spatial light modulators 101, and the light transmittance of each light transmission control region can be changed to control the light transmission state of each light transmission control region for transmitting light to the corresponding sub-spatial light modulator 101, where the light transmission state includes a light transmission state and a light non-transmission state.
In the holographic display device provided by the invention, the optical switch 300 is arranged between the light source part 200 and the spliced spatial light modulator array 100, the optical switch 300 is divided into a plurality of light-transmitting control areas corresponding to the sub-spatial light modulators 101, whether light beams of the light source part 100 pass or not can be controlled, the light source part 100 does not need to be changed, and the partitioned illumination of the spliced spatial light modulator array can be realized. When the sub-spatial light modulator 101 loads the hologram, the optical switch 300 controls the light transmission control area corresponding to the sub-spatial light modulator 101 to be in a light transmission state, so that the reconstruction beam passes through, thereby illuminating the hologram; when the sub-spatial light modulator 101 is not loaded with a hologram, the optical switch 300 controls the corresponding light transmission control region to be in a non-transparent state so that the reconstruction beam does not pass through, thereby not illuminating the hologram.
Therefore, the holographic display device provided by the invention can directly control the reconstruction light beams corresponding to each sub-spatial light modulator 101 to pass or not to pass through the optical switch 300 without directly controlling the switch of the light source component, thereby solving the problem that the reconstruction light source influences the quality of the reconstruction holographic image when the spliced spatial light modulator is used as the holographic display screen.
In the holographic display device provided by the present invention, a frame 102 is disposed between the sub-spatial light modulators 101 of the tiled spatial light modulator array, and the frame 102 is divided into a plurality of sub-spatial light modulators 101, and each sub-spatial light modulator 101 is loaded with a hologram separately.
The following describes preferred embodiments of the holographic display device provided by the present invention.
As shown in fig. 1 to 3, in the holographic display device according to the preferred embodiment of the present invention, the optical switch 300 includes:
a first transparent electrode 311 and a second transparent electrode 312 which are oppositely arranged;
and a liquid crystal layer 313 disposed between the first transparent electrode 311 and the second transparent electrode 312;
at least one of the first transparent electrode 311 and the second transparent electrode 312 includes a plurality of first electrode blocks, and the first electrode blocks are arranged in a one-to-one correspondence with the plurality of sub-spatial light modulators 101, so as to divide the optical switch 300 into a plurality of light transmission control regions, each of which is matched with an opposite electrode to drive the liquid crystal layer 313 in the corresponding light transmission control region.
With the above-described configuration, in the above-described configuration, one of the first transparent electrode 311 or the second transparent electrode 312 may be a surface electrode, and the other electrode may include a plurality of transparent first electrode blocks, or each of the first transparent electrode 311 and the second transparent electrode 312 may be designed to include a plurality of transparent first electrode blocks, the plurality of transparent first electrode blocks may divide the reproduced light irradiation region into a plurality of light transmission control regions corresponding to the plurality of sub-spatial light modulators 101, and each of the transparent first electrode blocks and the electrode opposite thereto drive liquid crystal molecules in the respective light transmission control regions. Wherein, by applying voltage to the first transparent electrode 311 and the second transparent electrode 312 on both sides of the liquid crystal layer 313, the arrangement direction of the liquid crystal molecules of the liquid crystal layer 313 is changed, and the inversion of the liquid crystal molecules is controlled. According to the characteristic that the transmittance is different when the liquid crystal molecules are aligned in different directions, light can pass through the liquid crystal layer 313 when the liquid crystal molecules are aligned perpendicular to the light; when the liquid crystal molecules are arranged in parallel with the light rays, the light rays cannot pass through the liquid crystal layer 313, so that the purpose of controlling whether the light passes through the liquid crystal layer 313 is achieved, the light passing or not of each light-transmitting control area of the optical switch 300 is further controlled, and the problem of interference of the reconstruction beams of the sub-spatial light modulator 101 which does not display the hologram on the holographic reconstruction image is further solved.
In a preferred embodiment provided by the present invention, the holographic display device further comprises: a controller for inputting control signals to the spatial light modulator array structure 100 to drive each sub-spatial light modulator 101; the first transparent electrode 311 and the second transparent electrode 312 of the optical switch 300 are connected to the controller, and the controller is further configured to control each light transmission control area of the optical switch 300 to be driven synchronously with the corresponding sub-spatial light modulator 101.
It should be noted that, in the above solution, the optical switch 300 utilizes the characteristic that the transmittance of liquid crystal molecules is different in different directions to control whether light passes through, which enables each light transmission control region to be driven synchronously with the corresponding sub-spatial light modulator 101, so that when the sub-spatial light modulator 101 loads a hologram, the corresponding light transmission control region correspondingly drives the liquid crystal molecules to be arranged perpendicular to the light, and light passes through to illuminate the hologram, and when the sub-spatial light modulator 101 does not load the hologram, the corresponding light transmission control region correspondingly drives the liquid crystal molecules to be arranged parallel to the light, so that light does not pass through, and the hologram is not illuminated.
It should be understood that in practical applications, the optical switch 300 may also be implemented in other ways, such as: each light transmission control area of the optical switch 300 is provided with a removable shading block, when the sub-spatial light modulator 101 does not load the hologram, the corresponding shading block is controlled to shade the light transmission control area, and when the sub-spatial light modulator 101 loads the hologram, the corresponding shading block is controlled to move away without shading the light transmission control area; the specific implementation of the optical switch 300 is not limited herein.
It should be noted that, the optical switch can control the light to pass through or not pass through, and also can control the light transmission state of the light to be a semi-transparent state according to actual needs by changing the light transmittance.
Further, in the holographic display device provided in the embodiment of the present invention, the holographic display device further includes: and a light adjusting component for adjusting the light emitted from the light source component 200 to a predetermined state and then entering the spatial light modulator array structure 100.
In the above-described embodiment, the light source unit 200 may be a one-point light source, and the light of the point light source may be adjusted by the light adjustment unit to be a collimated reproduced light beam to illuminate each of the sub-spatial light modulators 101 through the optical switch 300, or the light of the light source unit 200 may be adjusted by the light adjustment unit to be another desired light beam to illuminate each of the sub-spatial light modulators 101.
In a preferred embodiment of the present invention, the light adjusting component includes a lens array structure, the lens array structure includes a plurality of lens units arranged in an array, and the plurality of lens units and the plurality of sub-spatial light modulators are arranged in a one-to-one correspondence manner.
With the above-described arrangement, the reproduction illumination light of the corresponding sub-spatial light modulator 101 can be adjusted by each lens cell in the lens array structure 400. It should be noted that, in practical applications, the light ray adjusting component may be not limited to the lens array structure, but may be other optical structures arranged according to practical needs, and this provides only one preferred embodiment, but is not limited thereto.
In a preferred embodiment provided by the present invention, as shown in fig. 1 to 3, the lens array structure is a liquid lens array structure 400, and the liquid lens array structure 400 includes a plurality of liquid lens units.
In the above solution, the liquid lens array structure 400 adopted by the lens array structure 400 is beneficial to flattening the whole device compared with the traditional multiple discrete optical lenses; on the other hand, the liquid lens cell may change the focal length, thereby providing a reproduction illumination beam individually to each sub-spatial light modulator 101. It is of course understood that the lens array structure 400 is not limited thereto in practical applications.
Further, in a preferred embodiment provided by the present invention, as shown in fig. 1 to 3, the liquid lens array structure 400 includes:
a first transparent substrate and a second transparent substrate 410 disposed opposite to each other;
a fourth transparent electrode is disposed on the second transparent substrate 410, the second transparent substrate 410 comprising a first surface facing the sub-spatial light modulator 101;
a third transparent electrode 416 disposed opposite to the fourth transparent electrode;
and a blocking layer 412 formed on the first surface, wherein the blocking layer 412 includes a plurality of groove regions, the plurality of groove regions are arranged in one-to-one correspondence with the plurality of sub-spatial light modulators 101, the blocking layer 412 is covered with a hydrophobic layer 413, the groove regions are filled with a first liquid 414, and a second liquid 415 is filled between the first liquid 414 and the first transparent electrode 420;
the first liquid 414 is a non-polar insulating liquid, the second liquid 415 is a conductive or polar liquid, and a liquid interface shape formed between the first liquid 414 and the second liquid 415 can be changed according to different voltages applied to the third transparent electrode 416 and the fourth transparent electrode, so as to adjust a focal length of the liquid lens unit.
In the above solution, as shown in fig. 1, an intermediate isolation layer 412 may be formed on the second transparent substrate 410, where the intermediate isolation layer 412 is a mesh structure, each mesh forms a groove region, and correspondingly forms a liquid lens unit, and each liquid lens unit corresponds to one sub-spatial light modulator 101; covering the second transparent substrate 410 and the middle separation layer 412 with a hydrophobic layer 413, wherein the hydrophobic layer 413 may be made of a material with stronger hydrophobicity such as Teflon (Teflon), and in order to prevent the hydrophobic layer 413 from being broken down by an applied voltage, preferably, an insulating medium layer may be first formed between the hydrophobic layer 413 and the second transparent substrate 410 and below the hydrophobic layer 413, for example: a dielectric layer of polyimide is adopted; the inside of the reticulated pore structure of the middle isolation layer 412 is filled with a first liquid 414, i.e., a non-polar insulating liquid (e.g., mineral oil, etc.). When no voltage is applied, the height of the first liquid 414 is equal to the height of the middle separation layer 412, above the first liquid 414 is the second liquid 415, i.e. a conductive or polar liquid (e.g. saline solution, deionized water, or the like), above the second liquid 415 is the third transparent electrode 416 (the third transparent electrode 416 may be a transparent conductive electrode made of ITO, ZnO, or a conductive polymer), when no voltage is applied, the contact surface between the second liquid 415 and the first liquid 414 is a plane (i.e. the first liquid level a shown in fig. 1), when a voltage is applied between the third transparent electrode 416 and the middle separation layer 412, the contact angle between the second liquid 415 and the middle separation layer 412 changes from non-wetting to wetting, and gradually decreases with the increase of the voltage, so that the contact surface between the second liquid 415 and the first liquid 414 changes to a curved surface (i.e. the second liquid level b shown in fig. 1), thereby forming a liquid lens that adjusts the reproduction light beam emitted from the light source section 200 to become collimated illumination light or other desired light beam.
In the holographic display device provided in the embodiment of the present invention, preferably, at least one of the third transparent electrode 416 and the fourth transparent electrode includes a plurality of second electrode blocks, the plurality of second electrode blocks are disposed in one-to-one correspondence with the plurality of groove regions to divide the optical switch 300 into the plurality of liquid lens units, and each of the second electrode blocks can be separately driven, so that a focal length of each of the liquid lens units can be separately adjusted.
With the above scheme, one of the third transparent electrode 416 and the fourth transparent electrode is a planar electrode, and the other electrode may be divided into a plurality of transparent second electrode blocks, alternatively, the third transparent electrode 416 and the fourth transparent electrode may be designed to include a plurality of transparent second electrode blocks, which may divide the liquid lens array structure 400 into a plurality of liquid lens cells corresponding to the plurality of sub-spatial light modulators 101, each transparent second electrode block and the electrode opposite thereto are separately driven, so that the contact surface of the first liquid 414 and the second liquid 415 in the respective corresponding liquid lens cell is changed, that is, each liquid lens cell can control the voltage applied to the second electrode block individually to control and change the focal length of the liquid lens cell, thereby providing a reproduction illumination beam for each sub-spatial light modulator 101 individually.
It is of course understood that in practical applications, the driving control of each liquid lens unit may also be realized by other means, such as: the third transparent electrode 416 and the fourth transparent electrode are both monolithic electrodes capable of covering the whole area corresponding to the spatial light modulator array structure 100, and the third transparent electrode 416 and the fourth transparent electrode are respectively provided with a plurality of driving fields which are in one-to-one correspondence with a plurality of groove areas to form the liquid lens units, each driving area can be driven independently, so that the focal length of each liquid lens unit can be adjusted independently, and light beams entering each sub-spatial light modulator 101 are controlled to be in a required preset state.
Note that the electrodes in each liquid lens cell may be driven simultaneously, and when holographic display is performed, each liquid lens cell may be driven simultaneously so that the contact surface between the first liquid 414 and the second liquid 415 in each liquid lens cell is a curved surface.
In addition, in the embodiment provided by the present invention, preferably, the third transparent electrode 416 and the fourth transparent electrode are connected to the controller, and the controller is further configured to control each liquid lens unit of the liquid lens array to be driven synchronously with the corresponding sub-spatial light modulator 101.
By adopting the scheme, synchronous driving of each liquid lens unit and each corresponding sub-spatial light modulator 101 can be realized.
In addition, in the embodiment provided by the present invention, preferably, as shown in fig. 1, the third transparent electrode 416 and the second transparent electrode 312 share the same electrode. By adopting the above scheme, the second transparent electrode 312 in the optical switch 300 and the third transparent electrode 416 in the liquid lens array share the same electrode, so that the manufacturing process is simplified, and at the same time, the device flattening is facilitated, and in addition, the optical switch 300, the liquid lens array and the air-conditioning light modulator array are conveniently and synchronously driven, so that during the operation of the holographic display device, when only the corresponding sub-spatial light modulator 101 loads a hologram, the voltages loaded on the first transparent electrode 311, the second transparent electrode 312 and the third transparent electrode 416 need to be simultaneously controlled, so that the contact surfaces of the second liquid 415 and the first liquid 414 in the liquid lens unit corresponding to the sub-spatial light modulator 101 loaded with the hologram are in the predetermined curved surface state, and the liquid crystal layer 313 in the corresponding light transmission control region of the optical switch 300 is in the light passing state.
It is of course understood that all liquid lens cells in the liquid lens array may be in a state where the electrodes are always under voltage during the operation of the holographic display device, that is, the contact surface between the second liquid 415 and the first liquid 414 of all liquid lens cells is always in a curved surface state.
It should be noted that, in the above embodiment, the first liquid and the second liquid are located between the third transparent electrode and the fourth transparent electrode, and in another embodiment of the present invention, as shown in fig. 2, the third transparent electrode 416 may also be disposed on a side of the second transparent substrate away from the first liquid and the side.
Further, in the embodiment provided by the present invention, preferably, the holographic display device further includes: an optical deflection mechanism for adjusting the holographic beam emitted from each sub-spatial light modulator 101 so as to deflect the holographic beam emitted from each sub-spatial light modulator 101 to a predetermined display space is disposed on a side of the spatial light modulator array structure 100 away from the light source unit 200.
With the above arrangement, the optical deflecting mechanism deflects the reproduced hologram light beam diffracted by each sub-spatial light modulator 101 to a preset display space, for example: the reconstructed hologram light beams diffracted by the respective sub-spatial light modulators 101 are deflected to the same display space so that the observer does not feel the discontinuity of the hologram image.
In the embodiment provided by the present invention, preferably, as shown in fig. 3, the plurality of sub spatial light modulators 101 includes at least a first sub spatial light modulator 101a and a second sub spatial light modulator 101 b; the optical deflecting mechanism includes at least: the transflective mirror 601 is arranged corresponding to the first sub-spatial light modulator 101a, the transflective mirror 601 is arranged obliquely at a first inclination angle relative to the holographic light beam emitted by the first sub-spatial light modulator 101a, and the transflective mirror 601 can enable the holographic light beam emitted by the first sub-spatial light modulator 101a to transmit to the preset display space; and the reflector 602 is arranged corresponding to the second sub-spatial light modulator 101b, the reflector 602 is arranged obliquely at a second inclination angle relative to the holographic beam emitted from the second sub-spatial light modulator 101b, and the reflector 602 enables the holographic beam emitted from the second sub-spatial light modulator 101b to enter the half mirror 601 after being reflected by the reflector 602, and then to be emitted to the preset display space after being reflected by the half mirror 601.
By adopting the above scheme, the optical deflection mechanism can deflect light by using the reflecting mirror 602 and the half-transmitting and half-reflecting mirror 601, so as to achieve the purpose of deflecting the holographic light beams emitted by each sub-spatial light modulator 101 to the preset display space, and the structure is simple. In practical applications, the optical deflecting mechanism may also be implemented by other structures, which are not limited to this.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A holographic display, comprising:
the spatial light modulator array structure comprises a plurality of sub-spatial light modulators which are arranged in an array, and different sub-spatial light modulators can be independently loaded with different holograms and displayed in a time-sharing manner;
a light source section for providing a light source for the spatial light modulator array structure, the light source section being disposed at one side of the spatial light modulator array structure;
and an optical switch disposed between the light source component and the spatial light modulator array structure;
the optical switch comprises a plurality of light transmission control areas which are in one-to-one correspondence with the plurality of sub-spatial light modulators, and the light transmittance of each light transmission control area can be changed so as to control the light transmission state of each light transmission control area for transmitting light to the corresponding sub-spatial light modulator, wherein the light transmission state comprises a light transmission state and a light-tight state.
2. Holographic display of claim 1,
the optical switch includes:
the first transparent electrode and the second transparent electrode are oppositely arranged;
and a liquid crystal layer disposed between the first transparent electrode and the second transparent electrode;
wherein, first transparent electrode with at least one electrode in the second transparent electrode includes a plurality of first electrode pieces, and is a plurality of first electrode piece and a plurality of sub-spatial light modulator one-to-one sets up, with optical switch divides into a plurality ofly the printing opacity control area, every first electrode piece and relative electrode cooperation drive liquid crystal layer in the respective printing opacity control area that corresponds.
3. Holographic display of claim 2,
the holographic display device further includes:
a controller for inputting control signals to the spatial light modulator array structure to drive each sub-spatial light modulator; the first transparent electrode and the second transparent electrode of the optical switch are connected with the controller, and the controller is further used for controlling each light transmission control area of the optical switch to be driven synchronously with the corresponding sub-spatial light modulator.
4. Holographic display of claim 3,
the holographic display device further includes:
the light adjusting component is used for enabling the light emitted by the light source component to enter the spatial light modulator array structure after being adjusted to a preset state;
the light ray adjusting component comprises a lens array structure, the lens array structure comprises a plurality of lens units which are arranged in an array mode, and the lens units and the sub-spatial light modulators are arranged in a one-to-one correspondence mode.
5. Holographic display of claim 4,
the lens array structure is a liquid lens array structure comprising a plurality of liquid lens cells,
the liquid lens array structure includes:
the first transparent substrate and the second transparent substrate are oppositely arranged;
a fourth transparent electrode is arranged on the second transparent substrate, and the second transparent substrate comprises a first surface facing the sub-spatial light modulator;
a third transparent electrode disposed opposite to the fourth transparent electrode;
the partition layer is formed on the first surface and comprises a plurality of groove areas, the groove areas and the sub-spatial light modulators are arranged in a one-to-one correspondence mode, the partition layer is covered with a hydrophobic layer, first liquid is filled in the groove areas, and second liquid is filled between the first liquid and the first transparent electrodes;
the first liquid is a non-polar insulating liquid, the second liquid is a conductive or polar liquid, and the shape of a liquid interface formed between the first liquid and the second liquid can be changed according to different voltages applied to the third transparent electrode and the fourth transparent electrode, so that the focal length of the liquid lens unit can be adjusted.
6. Holographic display of claim 5,
at least one of the third transparent electrode and the fourth transparent electrode comprises a plurality of second electrode blocks, the second electrode blocks are arranged in one-to-one correspondence with the groove regions to divide the optical switch into a plurality of liquid lens units, and each second electrode block can be respectively and independently driven so that the focal length of each liquid lens unit can be independently adjusted;
or, the third transparent electrode and the fourth transparent electrode are both monolithic electrodes capable of covering the whole area corresponding to the spatial light modulator array structure, and the third transparent electrode and the fourth transparent electrode are respectively provided with a plurality of driving fields which are arranged in one-to-one correspondence with the plurality of grooves so as to form the liquid lens units, and each driving area can be driven independently, so that the focal length of each liquid lens unit can be adjusted independently.
7. Holographic display of claim 5,
an insulating layer is formed between the hydrophobic layer and the second transparent substrate.
8. Holographic display of claim 5,
the third transparent electrode and the fourth transparent electrode are connected with the controller, and the controller is further used for controlling each liquid lens unit of the liquid lens array to be driven synchronously with the corresponding sub-spatial light modulator.
9. Holographic display of claim 5,
the third transparent electrode and the second transparent electrode share the same electrode.
10. Holographic display of claim 1,
the holographic display device further includes:
the optical deflection mechanism is used for adjusting the holographic beams emitted by each sub-spatial light modulator so as to deflect the holographic beams emitted by each sub-spatial light modulator to a preset display space and is arranged on one side, far away from the light source part, of the spatial light modulator array structure;
the plurality of sub-spatial light modulators comprises at least a first sub-spatial light modulator and a second sub-spatial light modulator; the optical deflecting mechanism includes at least:
the half mirror is arranged corresponding to the first sub-spatial light modulator and is inclined at a first inclination angle relative to the holographic light beam emitted by the first sub-spatial light modulator, and the half mirror can enable the holographic light beam emitted by the first sub-spatial light modulator to be transmitted to the preset display space;
and the reflector is arranged corresponding to the second sub-spatial light modulator, the reflector is obliquely arranged at a second inclination angle relative to the holographic light beam emitted by the second sub-spatial light modulator, and the reflector can enable the holographic light beam emitted by the second sub-spatial light modulator to enter the semi-transparent semi-reflecting mirror after being reflected by the reflector, and then to be emitted to the preset display space after being reflected by the semi-transparent semi-reflecting mirror.
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| CN111190334B (en) * | 2019-09-02 | 2021-08-06 | 杭州辰景光电科技有限公司 | Computer-generated holographic 3D display system and method based on spatial light modulator splicing array |
| CN114023579B (en) * | 2021-09-29 | 2023-07-14 | 北京理工大学 | Transmission type optical switch, array transmission type optical switch and electronic equipment |
| CN115963633A (en) * | 2022-07-29 | 2023-04-14 | 合肥京东方卓印科技有限公司 | Holographic light field display system |
| CN116772159A (en) * | 2023-08-22 | 2023-09-19 | 深圳市帝狼光电有限公司 | Double-sided desk lamp |
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