CN107340704B - Holographic display device - Google Patents

Abstract

The invention provides a holographic display device, comprising: a spatial light modulator array structure, including a plurality of sub-spatial light modulators arranged in an array, different sub-spatial light modulators can independently load different holograms, and time-sharing Display; a light source component for providing a light source for the spatial light modulator array structure, the light source component is arranged on one side of the spatial light modulator array structure; and, an optical switch arranged between the light source component and the spatial light modulator array structure; The optical switch includes a plurality of light transmission control regions arranged in a one-to-one correspondence with a plurality of subspace light modulators, and the light transmission rate of each light transmission control region can be changed to control the light transmission of each light transmission control region to the corresponding subspace light. A light transmission state in which the modulator transmits light, the light transmission state including a light transmission state and an opaque state. The holographic display device provided by the invention solves the problem of the influence of the reproduction light source on the quality of the reproduced holographic image when the spliced spatial light modulator array is used as the holographic display screen.

Description

A holographic display device

technical field

The present invention relates to the field of display technology, in particular to a holographic display device.

Background technique

The spliced spatial light modulator array structure in the holographic reconstruction display device includes a plurality of sub-spatial light modulators arranged in an array, and each sub-spatial light modulator can independently load a different hologram and display it in a time-sharing manner.

In the prior art, in such a holographic reconstruction display device using a spliced spatial light modulator, the reproduction light source may be the same reproduction light source, or may be different reproduction light sources independently controlled according to the display state of the spatial light modulator. When the reproduction light source is the same reproduction light source, since the reproduction light source is always in the illumination state, when a certain subspace light modulator does not display a holographic image at a certain moment, the reproduction light source can pass through the subspace light modulator, The transmitted light beam will have an impact on the viewing effect of the holographic reproduction image by the human eye; and when each sub-spatial light modulator corresponds to a different independently controllable reproduction light source, the switch of the reproduction light source is directly controlled, so when a certain moment occurs. When a subspace light modulator is loaded with a hologram, its corresponding reproducing light source is lit. Since the light energy emitted by the light source needs a process from illuminating to stable, in this process, the unstable reproduced beam is blocked by the subspace light. The quality of the holographic reconstructed image obtained by the modulation of the hologram loaded on the modulator is unstable, which leads to the deterioration of the effect of the holographic reconstructed image.

SUMMARY OF THE INVENTION

The purpose of the present invention is 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 time-sharing, the reproduction light source of the sub-spatial light modulator that does not display the hologram is not suitable for The interference of the holographic reproduced image causes the problem of image quality degradation.

The technical scheme provided by the present invention is as follows:

A holographic display device, comprising:

A spatial light modulator array structure, the spatial light modulator array structure includes a plurality of sub-spatial light modulators arranged in an array, and different sub-spatial light modulators can independently load different holograms and display them in a time-sharing manner;

a light source component for providing a light source for the spatial light modulator array structure, the light source component is arranged on 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;

Wherein, the optical switch includes a plurality of light transmission control regions arranged in a one-to-one correspondence with a plurality of sub-spatial light modulators, and the light transmittance of each light transmission control region can be changed to control each of the light transmission control regions A light transmission state in which light is transmitted to the corresponding subspatial light modulator, wherein the light transmission state includes a light transmission state and an opaque state.

Further, the optical switch includes:

a first transparent electrode and a second transparent electrode arranged oppositely;

and, a liquid crystal layer disposed between the first transparent electrode and the second transparent electrode;

Wherein, at least one of the first transparent electrode and the second transparent electrode includes a plurality of first electrode blocks, and a plurality of the first electrode blocks are arranged in a one-to-one correspondence with a plurality of the sub-spatial light modulators , so as to divide the optical switch into a plurality of the light transmission control areas, and each of the first electrode blocks cooperates with the opposite electrodes to drive the liquid crystal layer in the corresponding light transmission control area.

Further, the holographic display device further includes:

a controller for inputting a control signal to the spatial light modulator array structure to drive each sub-spatial light modulator; wherein the first transparent electrode and the second transparent electrode of the optical switch are connected to the controller, The controller is further configured to control each light transmission control region of the optical switch to be driven synchronously with the corresponding sub-spatial light modulator.

Further, the holographic display device further includes:

A light adjustment component for adjusting the light emitted from the light source component to a preset state and then entering the spatial light modulator array structure; the light adjustment component includes a lens array structure, and the lens array structure includes an array arrangement a plurality of lens units, and the plurality of lens units are arranged in a one-to-one correspondence with a plurality of sub-spatial light modulators;

The lens array structure is a liquid lens array structure, and the liquid lens array structure includes a plurality of liquid lens units.

Further, the liquid lens array structure includes:

a first transparent substrate and a second transparent substrate arranged oppositely;

A fourth transparent electrode is provided on the second transparent substrate, the second transparent substrate includes a first surface facing the sub-spatial light modulator;

a third transparent electrode arranged opposite to the fourth transparent electrode;

and, an isolation layer formed on the first surface, the isolation layer includes a plurality of groove areas, and the multiple groove areas are arranged in a one-to-one correspondence with the plurality of the sub-spatial light modulators, and the isolation layer is covered with a hydrophobic layer, filled with a first liquid in the groove area, and filled with a second liquid between the first liquid and the first transparent electrode;

Wherein, the first liquid is a non-polar insulating liquid, the second liquid is a conductive or polar liquid, and the shape of the liquid interface formed between the first liquid and the second liquid can be determined according to the third liquid. The voltage applied to the transparent electrode and the fourth transparent electrode is different, so as to adjust the focal length of the liquid lens unit.

Further, at least one of the third transparent electrode and the fourth transparent electrode includes a plurality of second electrode blocks, and a plurality of the second electrode blocks are arranged in a one-to-one correspondence with a plurality of the groove regions, In order to divide the optical switch into a plurality of the liquid lens units, each of the second electrode blocks can be driven individually, so that the focal length of each of the liquid lens units can be adjusted independently;

Alternatively, the third transparent electrode and the fourth transparent electrode are both monolithic electrodes capable of covering the entire region corresponding to the spatial light modulator array structure, and the third transparent electrode and the fourth transparent electrode are on the There are a plurality of driving areas arranged in a one-to-one correspondence with a plurality of grooves to form the liquid lens unit, and each driving area can be driven independently, so that the focal length of each of the liquid lens units can be adjusted individually.

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 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.

Further, the third transparent electrode and the second transparent electrode share the same electrode.

Further, the holographic display device further includes:

An optical deflection mechanism for adjusting the holographic light beams emitted by each sub-spatial light modulator so as to deflect the holographic light beams emitted by each sub-spatial light modulator to a preset display space, which is arranged in the spatial light modulator array structure the side away from the light source component;

The plurality of subspatial light modulators at least include a first subspatial light modulator and a second subspatial light modulator; the optical deflection mechanism at least includes:

A half-mirror corresponding to the first sub-spatial light modulator, the half-mirror is inclined at a first inclination angle relative to the holographic beam emitted by the first sub-spatial light modulator, so The half mirror can make the holographic light beam output from the first subspace light modulator transmit to the preset display space;

and a reflecting mirror corresponding to the second sub-spatial light modulator, the reflecting mirror is inclined at a second inclination angle relative to the holographic light beam emitted by the second sub-spatial light modulator, and the reflecting mirror The holographic light beam emitted by the second sub-spatial light modulator can be reflected by the mirror to enter the half mirror, and then be reflected by the half mirror and then exit to the preset Display space.

The beneficial effects of the present invention are as follows:

In the holographic display device provided by the present invention, an optical switch is arranged between the light source and the spliced spatial light modulator array, and the optical switch is divided into a plurality of light transmission control areas corresponding to each sub-spatial light modulator, which can control the light source Whether the light beam passes through, the light source does not need to be changed, and the spliced spatial light modulator array partition illumination can be realized. When the subspatial light modulator is loaded with a hologram, the optical switch controls the light transmission control area corresponding to the subspatial light modulator to be in a light-transmitting state, so that the reproduced light beam passes through, thereby illuminating the hologram; when the subspatial light modulator is not loaded with a hologram , the optical switch controls the corresponding light transmission control area to be in an opaque state, so that the reproduced light beam does not pass through, thereby not illuminating the hologram. It can be seen that the holographic display device provided by the present invention does not directly control the switch of the light source itself, but can directly control the reproduction beam corresponding to each sub-spatial light modulator to pass or not pass through the optical switch, which solves the problem of using The problem of the influence of the reproduction light source on the quality of the reproduced holographic image when the spliced spatial light modulator is used as a holographic display screen.

Description of drawings

1 shows a schematic structural diagram of a first embodiment of a holographic display device provided by the present invention;

2 is a schematic structural diagram of a second embodiment of the holographic display device provided by the present invention;

FIG. 3 is a schematic structural diagram of a third embodiment of the holographic display device provided by the present invention.

Detailed ways

In order to make the purpose, 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 accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art fall within the protection scope of the present invention.

When each sub-spatial light modulator of a holographic display device using a spliced spatial light modulator in the prior art displays a hologram in a time-sharing manner, due to the control of the light source switch, the reproduction light source will make the sub-spatial light modulator that does not display a hologram. The problem that the holographic reconstructed image is disturbed and the image quality is degraded, the present invention provides a holographic display device, which can effectively solve the problem of reducing the interference of the reconstructed light beam of the sub-spatial light modulator that does not display the hologram on the holographic reconstructed image, and improve the image quality. quality.

As shown in FIG. 1 to FIG. 3 , the holographic display device provided by the present invention includes:

The spatial light modulator array structure 100, the spatial light modulator array structure 100 includes a plurality of sub-spatial light modulators 101 arranged in an array, and different sub-spatial light modulators 101 can independently load different holograms, and time-sharing show;

a light source component 200 for providing a light source for the spatial light modulator array structure 100, the light source component 200 is arranged on one side of the spatial light modulator array structure 100;

and, an optical switch 300 disposed between the light source component 200 and the spatial light modulator array structure 100;

The optical switch 300 includes a plurality of light transmittance control regions corresponding to the plurality of sub-spatial light modulators 101 one-to-one, and the light transmittance of each light transmittance control region can be changed to control each light transmittance A light transmission state in which the control region transmits light to the corresponding sub-spatial light modulator 101 , wherein the light transmission state includes a light transmission state and an opaque state.

In the holographic display device provided by the present invention, an optical switch 300 is arranged between the light source component 200 and the spliced spatial light modulator array 100 . In the control area, it is possible to control whether the light beam of the light source component 100 passes through, and the light source component 100 itself does not need to be changed, and the spliced spatial light modulator array can be illuminated in different regions. When the subspatial light modulator 101 is loaded with a hologram, the optical switch 300 controls the light transmission control area corresponding to the subspatial light modulator 101 to be in a light-transmitting state, so that the reproduced light beam passes through, thereby illuminating the hologram; when the subspatial light modulator 101 When the hologram is not loaded, the optical switch 300 controls the corresponding light transmission control area to be in an opaque state, so that the reproduced light beam does not pass through, so that the hologram is not illuminated.

It can be seen that the holographic display device provided by the present invention does not directly control the switch of the light source component itself, but can directly control the reproduction beam corresponding to each sub-spatial light modulator 101 through the optical switch 300. Pass or not pass, The problem of the influence of the reproduction light source on the quality of the reproduced holographic image when the spliced spatial light modulator is used as the holographic display screen is solved.

It should be noted that, in the holographic display device provided by the present invention, a frame 102 is set between each sub-spatial light modulator 101 of the spliced 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 independently.

Preferred embodiments of the holographic display device provided by the present invention are described below.

As shown in FIG. 1 to FIG. 3 , in the holographic display device provided by the preferred embodiment of the present invention, the optical switch 300 includes:

The first transparent electrode 311 and the second transparent electrode 312 arranged oppositely;

and, a liquid crystal layer 313 disposed between the first transparent electrode 311 and the second transparent electrode 312;

Wherein, at least one of the first transparent electrode 311 and the second transparent electrode 312 includes a plurality of first electrode blocks, and the plurality of the first electrode blocks are connected to the plurality of the sub-spatial light modulators 101 . A corresponding arrangement is used to divide the optical switch 300 into a plurality of the light transmission control areas, and each of the first electrode blocks cooperates with the opposite electrodes to drive the liquid crystal layer 313 in the corresponding light transmission control area.

Using the above solution, in the above solution, one electrode 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 may also be a Both the first transparent electrode 311 and the second transparent electrode 312 are designed to include a plurality of transparent first electrode blocks, and the plurality of transparent first electrode blocks can divide the reproduction light irradiation area into a plurality of corresponding sub-spatial light modulators 101 . In the light transmission control area, each transparent first electrode block and its opposite electrode drive the liquid crystal molecules in the corresponding light transmission control area. Wherein, by applying voltage to the first transparent electrodes 311 and the second transparent electrodes 312 on both sides of the liquid crystal layer 313, the alignment of the liquid crystal molecules in the liquid crystal layer 313 is changed to control the inversion of the liquid crystal molecules. According to the characteristics of different light transmittances when the liquid crystal molecules are arranged in different directions, when the liquid crystal molecules are arranged perpendicular to the light, the light can pass through the liquid crystal layer 313; when the liquid crystal molecules are arranged parallel to the light, the light cannot pass through the liquid crystal layer 313. Through the liquid crystal layer 313, the purpose of controlling whether the light passes through the liquid crystal layer 313 is achieved, and then the light in each light transmission control area of the optical switch 300 is controlled to pass or not pass, so as to solve the problem of subspace light that does not display the hologram. The problem of the interference of the reproduced beam of the modulator 101 to the holographic reproduced image.

In a preferred embodiment provided by the present invention, the holographic display device further comprises: a controller for inputting a control signal to the spatial light modulator array structure 100 to drive each sub-spatial light modulator 101; wherein, 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 also used to control each light transmission control area of the optical switch 300 and the corresponding subspace light modulation The device 101 is driven synchronously.

It should be noted that, in the above solution, the optical switch 300 utilizes the characteristics of different light transmittances when the liquid crystal molecules are arranged in different directions to control whether the light passes through. In this way, each light transmission control area and the corresponding subspace can be The light modulator 101 is driven synchronously, so that when the subspace light modulator 101 loads the hologram, the corresponding light transmission control area drives the liquid crystal molecules to align perpendicular to the light accordingly, so that the light passes through to illuminate the hologram, and the subspace light When the modulator 101 is not loaded with the hologram, the corresponding light transmission control area drives the liquid crystal molecules to be aligned parallel to the light accordingly, so that the light does not pass through and the hologram is not illuminated.

It should be understood that, in practical applications, the optical switch 300 can also be implemented in other ways. For example, a removable light-shielding block is provided in each light transmission control area of the optical switch 300. When the hologram is not loaded on the sub-spatial light modulator 101, the corresponding light-shielding block is controlled to block the light-transmitting control area; when the subspatial light modulator 101 loads the hologram, the corresponding light-shielding block is controlled to move away without blocking the light-transmitting control area; for The specific implementation of the optical switch 300 is not limited herein.

It should also be noted that the optical switch can not only control the light to pass or not pass, but also control the light transmission state to be a semi-transparent state according to actual needs by changing the light transmittance.

In addition, in the holographic display device provided by the embodiment of the present invention, the holographic display device further includes: the light emitted from the light source component 200 is adjusted to a preset state and then enters the spatial light modulator array structure 100 light adjustment parts.

In the above solution, the light source part 200 can be a point light source, and the light of the point light source can be adjusted into a collimated reproduced light beam by the light adjustment part, and the light switch 300 can be used to illuminate each sub-spatial light modulator 101, Alternatively, the light of the light source component 200 may be adjusted into other required light beams by the light adjusting component to illuminate each sub-spatial light modulator 101 .

In a preferred embodiment provided by the present invention, the light adjustment component includes a lens array structure, and the lens array structure includes a plurality of lens units arranged in an array, the plurality of lens units and the plurality of sub-spatial light modulators one by one corresponding settings.

With the above solution, through each lens unit in the lens array structure 400, the reproduced illumination light of the corresponding sub-spatial light modulator 101 can be adjusted. It should be noted that, in practical applications, the light adjustment component may not only be limited to the lens array structure, but may also be other optical structures set according to actual needs. Here, only a preferred method is provided, but it is not limited thereto. .

In the preferred embodiment provided by the present invention, as shown in FIG. 1 to FIG. 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 used in the lens array structure 400 is, on the one hand, favorable for the flattening of the entire device compared with the use of traditional multiple discrete optical lenses; on the other hand, the liquid lens unit can The focal length is varied to individually provide each subspatial light modulator 101 with a reproduced illumination beam. Of course, it can be understood that, in practical applications, the lens array structure 400 is not limited to this.

In addition, in the preferred embodiment provided by the present invention, as shown in FIG. 1 to FIG. 3 , the liquid lens array structure 400 includes:

a first transparent substrate and a second transparent substrate 410 arranged oppositely;

A fourth transparent electrode is disposed on the second transparent substrate 410, and the second transparent substrate 410 includes a first surface facing the sub-spatial light modulator 101;

a third transparent electrode 416 arranged opposite to the fourth transparent electrode;

And, the blocking layer 412 formed on the first surface, the blocking layer 412 includes a plurality of groove regions, and the plurality of groove regions are arranged in a one-to-one correspondence with the plurality of the sub-spatial light modulators 101, The blocking layer 412 is covered with a hydrophobic layer 413, and the groove area is 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 the shape of the liquid interface formed between the first liquid 414 and the second liquid 415 can be determined according to The voltage applied to the third transparent electrode 416 is different from that of the fourth transparent electrode, so as to adjust the focal length of the liquid lens unit.

In the above solution, as shown in FIG. 1 , an intermediate partition layer 412 may be fabricated on the second transparent substrate 410 , and the intermediate partition layer 412 has a mesh structure, each mesh hole forms a groove area, and a corresponding one is formed. Liquid lens units, each liquid lens unit corresponds to a sub-spatial light modulator 101; a hydrophobic layer 413 is covered on the second transparent substrate 410 and the intermediate partition layer 412, and the hydrophobic layer 413 can be made of Teflon or other hydrophobic In order to prevent the hydrophobic layer 413 from being broken down by the applied voltage, preferably, a layer of insulating medium can be made between the hydrophobic layer 413 and the second transparent substrate 410 under the hydrophobic layer 413 layer, for example: a dielectric layer using polyimide; the first liquid 414, ie a non-polar insulating liquid (eg mineral oil, etc.) is filled inside the mesh-like pore structure of the intermediate partition layer 412 . When no voltage is applied, the height of the first liquid 414 is equal to the height of the intermediate partition 412, and above the first liquid 414 is the second liquid 415, that is, a conductive or polar liquid (such as saline solution, or deionized water, etc.) , above the second liquid 415 is the third transparent electrode 416 (the third transparent electrode 416 can be a transparent conductive electrode made of ITO, ZnO or conductive polymer), when no voltage is applied, the second liquid 415 and the first The contact surface of the liquid 414 is a plane (ie, the first liquid surface a shown in FIG. 1 ). When a voltage is applied between the third transparent electrode 416 and the intermediate partition layer 412 , the second liquid 415 and the intermediate partition layer 412 are connected with each other. The time will change from non-wetting to wetting, and as the voltage increases, the contact angle between the two gradually decreases, so that the contact surface between the second liquid 415 and the first liquid 414 becomes a curved surface (that is, the second liquid 415 shown in FIG. liquid level b), thereby forming a liquid lens, and adjusting the reproduced light beam emitted by the light source part 200 to make it become collimated illumination light or other required light beams.

In the holographic display device provided by 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, and a plurality of the second electrodes Each of the second electrode blocks can be individually driven to make each The focal length of the liquid lens unit can be adjusted individually.

In the above solution, one of the third transparent electrode 416 and the fourth transparent electrode is a surface electrode, and the other electrode can be divided into a plurality of transparent second electrode blocks, or, the third transparent electrode can also be divided into Both the electrode 416 and the fourth transparent electrode are designed to include a plurality of transparent second electrode blocks, and the plurality of transparent second electrode blocks can divide the liquid lens array structure 400 into a plurality of liquid lens units corresponding to the plurality of sub-spatial light modulators 101 , each transparent second electrode block and its opposite electrodes are driven individually, so that the contact surfaces of the first liquid 414 and the second liquid 415 in the corresponding liquid lens units are changed, that is, each liquid lens unit can The voltage applied to the second electrode block is individually controlled to control and change the focal length of the liquid lens unit, thereby individually providing each sub-spatial light modulator 101 with a reproduced illumination beam.

Of course, it can be understood that, in practical applications, the driving control of each liquid lens unit can also be realized in other ways. For example, the third transparent electrode 416 and the fourth transparent electrode are both capable of covering the entire space. The whole electrode of the area corresponding to the light modulator array structure 100, and the third transparent electrode 416 and the fourth transparent electrode are distinguished with a plurality of driving areas corresponding to the plurality of groove areas, so as to form the entire electrode. In the liquid lens unit, each driving area can be driven independently, so that the focal length of each liquid lens unit can be adjusted independently, so as to control the light beam entering each sub-spatial light modulator 101 to a desired preset state.

In addition, it should be noted that the electrodes in each liquid lens unit can also be driven simultaneously. When performing holographic display, each liquid lens unit is driven at the same time, so that the first liquid 414 and the second liquid lens unit in each liquid lens unit are driven at the same time. The contact surfaces of the liquid 415 are all curved surfaces.

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 also used to control each liquid of the liquid lens array The lens units are driven in synchronization with the corresponding sub-spatial light modulators 101 .

With the above solution, each liquid lens unit can be driven synchronously with each corresponding sub-spatial light modulator 101 .

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. With the above solution, 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, which simplifies the manufacturing process and is more conducive to the flattening of the device. It is convenient to drive the optical switch 300, the liquid lens array and the air-conditioning light modulator array synchronously, so that during the operation of the holographic display device, only when the corresponding sub-spatial light modulator 101 loads the hologram, the simultaneous control A voltage is applied to a transparent electrode 311, a second transparent electrode 312 and a third transparent electrode 416, so that the contact between the second liquid 415 and the first liquid 414 in the liquid lens unit corresponding to the hologram-loaded subspatial light modulator 101 The surface is in a predetermined curved surface state, and the liquid crystal layer 313 of the corresponding light transmission control region of the optical switch 300 is in a light passing state.

Of course, it can be understood that all the liquid lens units in the liquid lens array may also be in a state of applying voltage to the electrodes all the time during the operation of the holographic display device, that is to say, the second liquid 415 and the first liquid 414 of all the liquid lens units The contact surface is always in the surface state.

It should also be noted that, in the above embodiments, the first liquid and the second liquid are located between the third transparent electrode and the fourth transparent electrode. In other embodiments of the present invention, such as 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.

In addition, in the embodiments provided by the present invention, preferably, the holographic display device further comprises: for adjusting the holographic light beams emitted by each sub-spatial light modulator 101, so that each sub-spatial light modulator 101 emits The optical deflection mechanism for deflecting the holographic light beam to a preset display space is disposed on the side of the spatial light modulator array structure 100 away from the light source component 200 .

With the above solution, the optical deflection mechanism deflects the reconstructed holographic light beam diffracted by each sub-spatial light modulator 101 to a preset display space, for example: deflects the reconstructed holographic light beam diffracted by each sub-spatial light modulator 101 to the same display space , so that the observer will not feel the discontinuity of the holographic image.

In the embodiment provided by the present invention, preferably, as shown in FIG. 3 , the plurality of subspatial light modulators 101 at least include a first subspatial light modulator 101a and a second subspatial light modulator 101b; the The optical deflection mechanism at least includes: a half mirror 601 corresponding to the first subspatial light modulator 101a, and the half mirror 601 is opposite to the hologram output from the first subspatial light modulator 101a. The light beam is inclined at a first inclination angle, and the half mirror 601 can make the holographic light beam output from the first subspace light modulator 101a transmit to the preset display space; and, with the second subspace light The reflecting mirror 602 corresponding to the spatial light modulator 101b, the reflecting mirror 602 is inclined at a second inclination angle relative to the holographic beam emitted from the second sub-spatial light modulator 101b, and the reflecting mirror 602 can make all the The holographic light beam emitted by the second sub-spatial light modulator 101b is reflected by the mirror 602 and then enters the half mirror 601, and then is reflected by the half mirror 601 and then exits to the pre-transmission mirror 601. Set the display space.

With the above solution, the optical deflection mechanism can use the mirror 602 and the half mirror 601 to deflect the light, so as to achieve the purpose of deflecting the holographic light beam emitted by each sub-space light modulator 101 to the preset display space. Simple. In practical applications, the optical deflection mechanism can also be implemented with other structures, which are not limited.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made. These improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A holographic display device, characterized in that, comprising: A spatial light modulator array structure, the spatial light modulator array structure includes a plurality of sub-spatial light modulators arranged in an array, and different sub-spatial light modulators can independently load different holograms and display them in a time-sharing manner; a light source component for providing a light source for the spatial light modulator array structure, the light source component is arranged on 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; Wherein, the optical switch includes a plurality of light transmission control regions arranged in a one-to-one correspondence with a plurality of sub-spatial light modulators, and the light transmittance of each light transmission control region can be changed to control each of the light transmission control regions A light transmission state in which light is transmitted to the corresponding subspatial light modulator, wherein the light transmission state includes a light transmission state and an opaque state. 2. The holographic display device according to claim 1, wherein, The optical switch includes: a first transparent electrode and a second transparent electrode arranged oppositely; and, a liquid crystal layer disposed between the first transparent electrode and the second transparent electrode; Wherein, at least one of the first transparent electrode and the second transparent electrode includes a plurality of first electrode blocks, and a plurality of the first electrode blocks are arranged in a one-to-one correspondence with a plurality of the sub-spatial light modulators , so as to divide the optical switch into a plurality of the light transmission control areas, and each of the first electrode blocks cooperates with the opposite electrodes to drive the liquid crystal layer in the corresponding light transmission control area. 3. The holographic display device according to claim 2, wherein, The holographic display device further includes: a controller for inputting a control signal to the spatial light modulator array structure to drive each sub-spatial light modulator; wherein the first transparent electrode and the second transparent electrode of the optical switch are connected to the controller, The controller is further configured to control each light transmission control region of the optical switch to be driven synchronously with the corresponding sub-spatial light modulator. 4. The holographic display device according to claim 3, wherein, The holographic display device further includes: a light adjusting component for adjusting the light emitted from the light source component to a preset state and then entering the spatial light modulator array structure; The light adjustment component includes a lens array structure, and the lens array structure includes a plurality of lens units arranged in an array, and the plurality of lens units are arranged in a one-to-one correspondence with the plurality of sub-spatial light modulators. 5. The holographic display device according to claim 4, wherein, The lens array structure is a liquid lens array structure, and the liquid lens array structure includes a plurality of liquid lens units, The liquid lens array structure includes: a first transparent substrate and a second transparent substrate arranged oppositely; A fourth transparent electrode is provided on the second transparent substrate, the second transparent substrate includes a first surface facing the sub-spatial light modulator; a third transparent electrode arranged opposite to the fourth transparent electrode; and, an isolation layer formed on the first surface, the isolation layer includes a plurality of groove areas, and the multiple groove areas are arranged in a one-to-one correspondence with the plurality of the sub-spatial light modulators, and the isolation layer is covered with a hydrophobic layer, filled with a first liquid in the groove area, and filled with a second liquid between the first liquid and the first transparent electrode; Wherein, the first liquid is a non-polar insulating liquid, the second liquid is a conductive or polar liquid, and the shape of the liquid interface formed between the first liquid and the second liquid can be determined according to the third liquid. The voltage applied to the transparent electrode and the fourth transparent electrode is different, so as to adjust the focal length of the liquid lens unit. 6. The holographic display device according to claim 5, wherein, At least one of the third transparent electrode and the fourth transparent electrode includes a plurality of second electrode blocks, and the plurality of second electrode blocks are arranged in a one-to-one correspondence with the plurality of groove regions, so as to connect all the The optical switch is divided into a plurality of the liquid lens units, and each of the second electrode blocks can be driven individually, so that the focal length of each of the liquid lens units can be adjusted independently; Alternatively, the third transparent electrode and the fourth transparent electrode are both monolithic electrodes capable of covering the entire region corresponding to the spatial light modulator array structure, and the third transparent electrode and the fourth transparent electrode are on the There are a plurality of driving areas arranged in a one-to-one correspondence with a plurality of grooves to form the liquid lens unit, and each driving area can be driven independently, so that the focal length of each of the liquid lens units can be adjusted individually. 7. The holographic display device according to claim 5, wherein, An insulating layer is formed between the hydrophobic layer and the second transparent substrate. 8. The holographic display device according to claim 5, wherein, The third transparent electrode 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. 9. The holographic display device according to claim 5, wherein, The third transparent electrode and the second transparent electrode share the same electrode. 10. The holographic display device according to claim 1, wherein, The holographic display device further includes: An optical deflection mechanism for adjusting the holographic light beams emitted by each sub-spatial light modulator so as to deflect the holographic light beams emitted by each sub-spatial light modulator to a preset display space, which is arranged in the spatial light modulator array structure the side away from the light source component; The plurality of subspatial light modulators at least include a first subspatial light modulator and a second subspatial light modulator; the optical deflection mechanism at least includes: A half-mirror corresponding to the first sub-spatial light modulator, the half-mirror is inclined at a first inclination angle relative to the holographic beam emitted by the first sub-spatial light modulator, so The half mirror can make the holographic light beam emitted by the first subspace light modulator transmit to the preset display space; and a reflecting mirror corresponding to the second sub-spatial light modulator, the reflecting mirror is inclined at a second tilt angle relative to the holographic light beam emitted by the second sub-spatial light modulator, and the reflecting mirror The holographic light beam emitted by the second sub-spatial light modulator can be reflected by the mirror to enter the half mirror, and then be reflected by the half mirror and then exit to the preset Display space.