CN116413940A - An image depth modulation module, display module and near-eye display device - Google Patents

Abstract

The invention discloses an image depth modulation module, which comprises stacked multi-layer electronically controlled dimming boards, each layer of electronically controlled dimming boards is composed of several electronically controlled dimming units, and each electronically controlled dimming unit has an independent switch , any electronically controlled dimming unit on different electronically controlled dimming boards can be independently adjusted to a transmission state or a scattering state; when the image depth modulation module is working, the electrical The light control and adjustment units are coordinated to be adjusted to be in a transmission state or a scattering state. At the same time, the present invention also discloses a display module and a near-eye display device using the image depth modulation module, which loads the depth of field to the image through the physical structure, and realizes pixel-level or quasi-pixel-level depth of field adjustment, which can solve the visual convergence conflict effect and make people The image observed by the human eye is more in line with the focusing habits of the human eye, making the depth arrangement of the displayed image closer to the depth law of the real light field.

Description

An image depth modulation module, display module and near-eye display device

technical field

The invention relates to the field of image display, in particular to an image depth modulation module, a display module and a near-eye display device using the image depth modulation module.

Background technique

In the existing HMD (Head Mount Display, head-mounted visual device) virtual reality/augmented reality display system, most of the optical display systems are designed according to a fixed imaging distance, so the image source is displayed in front of the human eye after passing through the optical display system The distance between the virtual image and the human eye is fixed. This kind of display without image depth of field will cause Vergence-Accommodation Conflict (VAC), resulting in "motion sickness", and the user experience is extremely poor. And if such an HMD device is used for augmented reality applications, since the distance between the virtual image and the human eye is constant, and the environment is constantly changing, the virtual image seen through these display systems is floating in the air, which is different from the actual The environment is separated, and the real enhanced display effect cannot be achieved.

Contents of the invention

The purpose of the present invention is to provide an image depth modulation module, a display module using the image depth modulation module, and a near-eye display device, so as to realize image display with depth of field and solve the problem of visual convergence conflict of the near-eye display device.

In order to achieve the purpose of the above invention, the present invention provides an image depth modulation module, including stacked multi-layer electronically controlled dimming boards, each layer of electronically controlled dimming boards is composed of several electronically controlled dimming units, each electronically controlled The dimming unit has an independent switch, and any electronically controlled dimming unit on different electronically controlled dimming boards can be independently adjusted to a transmission state or a scattering state;

When the image depth modulation module is working, the electronically controlled dimming units in the electronically controlled dimming panels of each layer are cooperatively adjusted to be in a transmission state or a scattering state.

Preferably, the electronically controlled dimming unit is a polymer stabilized liquid crystal photoelectric unit or a polymer dispersed liquid crystal photoelectric unit.

Preferably, the multi-layer electronically controlled dimming boards are arranged in parallel and at intervals.

Correspondingly, the present invention also provides a display module, including an image generation module, an image depth modulation module and an objective lens system, the image depth modulation module is the above-mentioned image depth modulation module, and the image generated by the image generation module The light first passes through the image depth modulation module, and then exits through the objective lens system.

Preferably, each electronically controlled dimming unit on each layer of the electrically controlled dimming board corresponds to one or more pixels generated by the image generation module.

Preferably, the image depth modulation module includes 12 layers of electronically controlled dimming boards stacked.

Preferably, the imaging distance P _n of each layer of electronically controlled dimming panels is designed according to the following formula:

Among them, L is the pupil diameter of the human eye, ε represents the resolution of the human eye, n is the number of layers of the electronically controlled dimming board, and when n is 1, it represents the first layer of the electronically controlled dimming board closest to the objective lens system.

Preferably, the range of ε is 1' to 3', and the range of L is 2mm-5mm.

Preferably, ε is 2', and L is 3.5mm.

Preferably, the scattering angle of each electronically controlled dimming unit is less than 60° and greater than 5°.

Correspondingly, the present invention also provides a near-eye display device, including one or two groups of near-eye display optical systems, each group of near-eye display optical systems includes a set of display modules and light guide systems as described above, and the image generation module generates The image light first passes through the image depth modulation module, and then enters the light guide system through the objective lens system, and then exits from the light guide system to the human eye.

Preferably, the near-eye display device further includes a processor, and the processor controls the image generation module to generate image light, and at the same time controls the image depth modulation module to control each layer of the electronically controlled dimming board according to the different depths of field corresponding to different regions of the image light. An electronically controlled dimming unit is adjusted to the transmission state or the scattering state.

Among them, the control image depth modulation module controls each electronically controlled dimming unit in each layer of electronically controlled dimming boards to adjust to a transmission state or a scattering state according to different depths of field corresponding to different areas of the image light, specifically:

Control the electronically controlled dimming unit in the corresponding area of the electronically controlled dimming board corresponding to the depth of field corresponding to the image light in a certain area to adjust to the scattering state, and adjust the electronically controlled dimming unit in the corresponding area of the electronically controlled dimming board on other layers arranged in a stack to transmission state.

Compared with the prior art, the present invention has the following beneficial effects:

The embodiment scheme of the present invention loads the depth of field to the image through the physical structure, realizes pixel-level or quasi-pixel-level depth-of-field adjustment, can solve the visual convergence conflict effect, make the image observed by the human eye more in line with the focusing habit of the human eye, and make the depth of the displayed image The arrangement is closer to the depth law of the real light field.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative labor:

FIG. 1 is a schematic structural diagram of an image depth modulation module according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of each layer of electronically controlled dimming panels in Fig. 1;

FIG. 3 is a schematic structural diagram of a display module according to an embodiment of the present invention;

FIG. 4 is another structural schematic diagram of a display module according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of a landscape image generated by the image generation module of the embodiment of the present invention;

6 is a schematic structural diagram of a near-eye display optical system in a near-eye display device according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a near-eye display device according to an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Referring to Fig. 1 , it is a schematic diagram of the structure of the image depth modulation module according to the embodiment of the present invention. The image depth modulation module according to the embodiment of the present invention includes stacked multi-layer electronically controlled dimming boards 10, and each layer of electronically controlled dimming boards 10 consists of several electronically controlled dimming boards. Controlled dimming unit 101, the structural diagram of each layer of electronically controlled dimming board 10 is shown in Figure 2, each electronically controlled dimming unit 101 has an independent switch, the switch can use transparent or translucent semiconductor Cells can be tuned into a transmissive or scattering state.

An image is incident from one side of the image depth modulation module, and the first part of the image passes through the first area of a layer of electronically controlled dimming board 10, since each electronically controlled dimming unit on the electronically controlled dimming board can be independently adjusted , so at this time, it is possible to control the electronically controlled dimming unit in the first area to become a scattering state, then the first part of the image is scattered in the first area of the electronically controlled dimming board, and at this time the first part of the image is loaded with a depth information; the second part of the image passes through the second area on another electronically controlled dimmer board and is scattered, and at this time the second part of the image is loaded with another depth information; and so on, each electronically controlled dimmer board can Responsible for one depth, the final implementation can load multiple depth information on the image. When the size of each electronically controlled dimming unit 101 constituting the electronically controlled dimming panel 10 is sufficiently small, depth modulation at pixel or quasi-pixel level can be realized.

Preferably, the electronically controlled dimming unit can choose to use a polymer stabilized liquid crystal photoelectric unit PSLC (polymerstabilized liquid crystal) or reverse PSLC, and can also choose to use a polymer dispersed liquid crystal photoelectric unit PDLC (polymer dispersed liquid crystal). A photoelectric unit with physical characteristics, the electronically controlled dimming unit is switched to a transmission state or a scattering state by applying a voltage or not applying a voltage. Take PSLC as an example for the electronically controlled dimming unit: TFT (Thin Film Transistor) or ITO and other similar technologies can be used to control the electrodes of PSLC, which is similar to a TFT display, except that each liquid crystal pixel in the TFT is replaced The PSLC is formed into a pixel-level PSLC, so that each PSLC can be controlled by a semiconductor switch at a corresponding position, generally using electric pulse control; each PSLC can be independently controlled by a semiconductor switch at its corresponding position. For example, the parameters of a PSLC electronically controlled dimming board can be designed to have a size of 3*4.5mm, a resolution of 640*540, and a thickness of 10um to 30um. The size of a PSLC is a square with a side length of 10 μm, so that the parts corresponding to the two different depths of the incident image can match each other more smoothly.

In order to make the depth modulation of the entire image picture uniform, it is preferable to arrange multi-layer electronically controlled dimming boards in parallel and at intervals. As for the distance between adjacent electronically controlled dimming boards, it needs to be used according to the difference in the preset focusing distance and whether it cooperates with other magnifying optics. Depending on the use of components, etc., different pitches can be designed, which is not limited here.

Referring to FIG. 3 , it is a schematic structural diagram of a display module according to an embodiment of the present invention. The near-eye display optical module according to an embodiment of the present invention includes an image generation module 2, an image depth modulation module 1, and an objective lens system 3. The image depth modulation module 1 is the aforementioned In the image depth modulation module described in the embodiment, the image generation module 2 generates collimated image light, which is first loaded with depth information by the image depth modulation module 1 , and then exits through the objective lens system 3 . In the embodiment of the present invention, each electronically controlled dimming unit on each layer of the electronically controlled dimming board can be designed to correspond to one or more pixels generated by the image generation module, when each electrically controlled dimming unit When the unit is designed to correspond to a pixel generated by the image generation module, pixel-level depth modulation is realized.

In Fig. 3, the image depth modulation module 1 is forward scattering. In specific implementation, the method shown in Fig. 4 can also be adopted, and the image generation module 2 is placed on the other side of the image depth modulation module 1, and the backscattering method accomplish.

The embodiment scheme of the present invention loads the depth of field to the image through the physical structure, which can solve the visual convergence conflict effect, make the image observed by the human eye more in line with the focusing habit of the human eye, and make the depth arrangement of the displayed image closer to the depth law of the real light field . Since the human eye is generally only sensitive to the depth of 12 layers, the 12-layer electronically controlled dimming board constitutes the best image depth modulation module. Of course, if you want to reduce the volume and weight of the near-eye display optical module, you can choose 3, 4, 5 or 6, 7, 8 layers, etc., also have the effect of depth of field, but the effect cannot reach the naturalness of 12 layers.

The following describes how the display module of the present invention realizes the depth of field in conjunction with Fig. 5, assuming that the electronically controlled dimming unit is a PSLC, as shown in Fig. 5, a landscape image is generated for the image generation module, and the landscape image is modulated from one side of the image depth modulation module Incidence, the tree's image area and the mountain's image area have different depths. For example: the image area of the tree is in charge of the first layer of electronically controlled dimming board of the image depth modulation module, and multiple PSLCs irradiated by the image area of the tree on the first layer of electronically controlled dimming board are controlled into a scattering state, and the tree The display position of the display is located at the position of the first layer of electronically controlled dimming board, that is, the focus position is located at the position of the first layer of electronically controlled dimming board, and the PSLC in other areas on the first layer of electronically controlled dimming board is controlled into a transmissive state The PSLC in the projection area of the PSLC in the scattering state on the first layer of electronically controlled dimming boards on other layers of electronically controlled dimming boards must also be controlled to be in a transmissive state; The control dimming board is responsible. The multiple PSLCs irradiated by the image area of the mountain on the second layer of the electronic control dimming board are controlled into a scattering state. The display position of the mountain is located at the position of the second layer of electronic control dimming board, that is, focusing The position is located at the position of the second layer of electronically controlled dimming board, and the PSLC in other areas on the second layer of electronically controlled dimming board is controlled to be in the transmission state, and the scattering state PSLC on the second layer of electronically controlled dimming board is electrically controlled on other layers. The PSLC of the projection area on the dimming board must also be controlled to be in a transmissive state; by analogy, the image parts of other depths of the landscape image are all displayed on a certain layer of electronically controlled dimming board, that is, at the same time there are The multi-layer electronically controlled dimming board is switched to the scattering state. Due to the focusing characteristics of the human eye, when the human eye focuses on a certain layer of electronically controlled dimmers, other layers of electronically controlled dimmers will appear as blurred images to achieve the effect of depth of field. As long as the size of each PSLC is small enough, the five depth images corresponding to the first depth area to the fifth depth area will be more smoothly connected to each other.

The previous paragraph described how to realize the depth of field of multi-layer electronically controlled dimming boards. The following describes how to design the image focus position of each layer of electronically controlled dimming boards on the basis of the previous paragraph to better solve visual convergence conflicts and better Simulates realistic light fields.

Next, we simply calculate the depth of field of the human eye. The resolution of the human eye is represented by ε, and the diameter of the pupil is L. When the focusing distance of the human eye is P, the distance between the distant view P ₁ and the near view P ₂ is:

Represented by diopter φ, the focus, distant view and near view positions can be expressed as:

The corresponding depth of field can be expressed in diopters as:

It can be seen that when the depth of field is represented by diopters, it is only related to the resolution ε of the human eye and the pupil diameter L, and the depth of field Δ of the human eye can be obtained by calculation. The focusing range of the human eye is generally from 0.25m to infinity, expressed as 0-4L in diopters. Therefore, in the process of designing the waveguide, if we need n layers of electronically controlled dimming panels to meet its imaging requirements, the imaging distance P _n of each layer of electronically controlled dimming panels can be expressed as:

Among them, L is the diameter of the pupil, ε represents the resolution of the human eye, n is the number of layers of the electronically controlled dimming board, and when n is 1, it represents the first layer of electronically controlled dimming board closest to the objective lens system. The imaging distance of the first layer of electronically controlled dimming panels can be calculated by setting n=1, and the imaging distance of the second layer of electronically controlled dimming panels can be calculated by setting n=2, and the imaging distance of other layers of electronically controlled dimming panels can be calculated in turn distance. The imaging distance of each layer of electronically controlled dimming panels obtained according to the above formula can enable the human eye to see a clear image at any focal length in the space, and finally satisfy the full-space imaging. In this section, the imaging distance can be set in the following two ways but not limited to: first, the imaging distance of different electronically controlled dimming boards can be realized through focusing methods such as lenses; The position of the light panel, while the imaging distance of each electronically controlled dimming panel is located at its own position. Considering that the second solution is too large and has low practicability in actual implementation, we usually choose to use focusing methods such as lenses to achieve the imaging distance of different electronically controlled dimmers, such as lens 3 in Figure 3. This lens At the same time, the enlargement of the distance and image is realized, so that the physical distance between the electronically controlled dimming boards can be compressed in proportion, and the miniaturization of the module can be realized.

The resolution ε of the human eye is generally 1' to 3', and the pupil diameter L is 2mm-5mm. Let’s take the resolution ε as 2’ and the pupil diameter L as 3.5mm as an example, according to the following formula:

Among them, the resolution ε expressed in angle needs to be converted into radians for calculation. The calculation can obtain the depth of field Δ as 0.3323L, and the focusing range of the human eye is from 0.25m to infinity, which is expressed as 0-4L in diopters. Therefore, in the process of designing the image depth modulation module, if we need 12 layers of electronically controlled dimming panels to meet its imaging requirements, the corresponding focusing distances of each electronically controlled dimming panel are: 0.2608m, 0.2856m, 0.3155m, 0.3525m, 0.3992m, 0.4603m, 0.5434m, 0.6632m, 0.8507m, 1.1860m, 1.9573m, 5.5991m. Due to the pupil diameter and angular resolution of the human eye, each plane has a depth of field range for the human eye, and 12 planes can connect the depth of field ranges, enabling the human eye to image clearly at any position in space. It can satisfy full-space imaging, so that the human eye can focus on any position and have a focal plane for clear imaging.

In the embodiment of the present invention, in order to prevent the scattering angle of a dimming board from being too large, and the scattered light of a certain dimming board will affect the dimming boards that are arranged behind, it is preferable that the scattering angle of each electronically controlled dimming unit is less than 60° and greater than 5°. For example, a certain position of an image is scattered by the No. 3 electronically controlled dimming unit of the second dimming board, and the light scattered by the No. 3 electronically controlled dimming unit of the second dimming board enters the third dimming board , and is scattered by the electronically controlled dimming unit on the third dimming board outside the projection surface of No. 3 electronically controlled dimming unit on the second dimming board, so that the position of the image will be scattered by multiple dimming boards , causing interference. The smaller the scattering angle, the smaller the degree of interference, but if the scattering angle is less than ~5°, the difference between the imaging depths of the two dimmers is too small, and it is difficult for the human eye to distinguish the depth of field of different dimmers, resulting in insufficient depth modulation.

The display modules in the above embodiments can be applied to near-eye display devices, such as virtual reality VR devices or augmented reality AR devices, and can also be applied to rear projection display devices, such as TV sets and advertising screens. Taking the near-eye display device as an example, the near-eye display device includes one or two groups of near-eye display optical systems, and each group of near-eye display optical systems includes a set of display modules and light guide systems in the embodiments of the present invention, as shown in Figure 6, which is a near-eye display optical system. A structural schematic diagram of a display optical system. The image light generated by the image generation module in the display module 400 first passes through the image depth modulation module, then exits through the objective lens system, and is coupled into the light guide system 5 through the coupling system 4. The light system 5 emits to the human eye. Refer to FIG. 7 for a schematic structural diagram of a near-eye display device. The display module 400 can be designed on both sides of the frame or on the temple, and the waveguide system 5 can be designed as a lens.

During specific implementation, the near-eye display device further includes a processor, and the processor controls the image generation module to generate image light, and at the same time controls the image depth modulation module to control the electronically controlled dimming panel in each layer according to the different depths of field corresponding to different regions of the image light. Each electronically controlled dimming unit is adjusted to a transmission state or a scattering state, specifically:

Control the electronically controlled dimming unit in the corresponding area of the electronically controlled dimming board corresponding to the depth of field corresponding to the image light in a certain area to adjust to the scattering state, and adjust the electronically controlled dimming unit in the corresponding area of the electronically controlled dimming board on other layers arranged in a stack to transmission state. Also use Figure 4 as an example, as shown in Figure 4, the electronically controlled dimming board corresponding to the depth of field corresponding to the tree is assumed to be the first layer of electronically controlled dimming board, and the electronically controlled dimming board corresponding to the depth of field corresponding to the mountain is assumed to be the second layer The first layer of electronically controlled dimming boards, the multiple electronically controlled dimming units that are irradiated by the image area of the tree on the first layer of electronically controlled dimming boards are controlled to be in a scattering state, and the scattering state on the first layer of electronically controlled dimming boards The electronically controlled dimming unit in the projection area of the electronically controlled dimming unit on other layers of electronically controlled dimming boards must also be controlled to be in a transmissive state; The first electronically controlled dimming unit is controlled to be in a scattering state, and the electronically controlled dimming units in the projection area of the electronically controlled dimming unit on other layers of electronically controlled dimming boards in the scattering state on the second layer of electronically controlled dimming boards must also be controlled. Control is in transmission state.

The present invention uses a multi-layer electronically controlled dimming board to realize the effect of depth of field by a physical method, so that the image seen by the human eye is more in line with the law of the real light field; in addition, the reasonable design of the imaging distance of the multi-layer electronically controlled dimming board can be more in line with reality The law of the spatial light field makes the focusing of the human eye more natural and closer to the focusing method in the real light field, making the human eye more comfortable. Finally, through the above two points, the discomfort of dizziness and eye swelling in VR and AR displays in the prior art can be effectively solved.

All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and/or steps.

Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

The present invention is not limited to the foregoing specific embodiments. The present invention extends to any new feature or any new combination disclosed in this specification, and any new method or process step or any new combination disclosed.

The above-mentioned technical scheme of the present application can be summarized as follows:

A1. An image depth modulation module, characterized in that it includes stacked multi-layer electronically controlled dimming boards, each layer of electronically controlled dimming boards is composed of several electronically controlled dimming units, and each electronically controlled dimming unit has Independent switch, any electronically controlled dimming unit on different electronically controlled dimming boards can be independently adjusted to the transmission state or scattering state;

When the image depth modulation module is working, the electronically controlled dimming units in the electronically controlled dimming panels of each layer are cooperatively adjusted to be in a transmission state or a scattering state.

A2. The image depth modulation module as described in A1, wherein the electronically controlled dimming unit is a polymer stabilized liquid crystal photoelectric unit or a polymer dispersed liquid crystal photoelectric unit.

A3. The image depth modulation module as described in A2, characterized in that the multi-layer electronically controlled dimming boards are arranged in parallel and at intervals.

A4, a display module, characterized in that it includes an image generation module, the aforementioned image depth modulation module and an objective lens system, the image light generated by the image generation module first passes through the image depth modulation module, and then exits through the objective lens system .

A5. The display module as described in A4, wherein each electronically controlled dimming unit on each layer of the electronically controlled dimming board corresponds to one or more pixels generated by the image generating module.

A6. The display module as described in A5, wherein the image depth modulation module includes 12 layers of electronically controlled dimming boards stacked.

A7. The display module as described in any one of A4 to A6 is characterized in that the imaging distance P _n of each layer of electronically controlled dimming panels is designed according to the following formula:

Among them, L is the pupil diameter of the human eye, ε represents the resolution of the human eye, n is the number of layers of the electronically controlled dimming board, and when n is 1, it represents the first layer of the electronically controlled dimming board closest to the objective lens system.

A8. The display module as described in A7, wherein the range of ε is 1' to 3', and the range of L is 2mm-5mm.

A9. The display module as described in A7, wherein ε is 2' and L is 3.5mm.

A10. The display module according to any one of A4 to A6, wherein the scattering angle of each electronically controlled dimming unit is less than 60° and greater than 5°.

A11. A near-eye display device, including one or two sets of near-eye display optical systems, characterized in that each set of near-eye display optical systems includes a set of display modules and light guide systems as described in any one of A4 to A10, The image light generated by the image generation module first passes through the image depth modulation module, and then enters the light guide system through the objective lens system, and then exits from the light guide system to the human eye.

A12. The near-eye display device as described in A11, characterized in that the near-eye display device also includes a processor, and the processor controls the image generation module to generate image light, and at the same time controls the image depth modulation module according to the different regions of the image light. Depth of field, to control each electronically controlled dimming unit in each layer of electronically controlled dimming boards to be adjusted to a transmission state or a scattering state.

A13, the near-eye display device as described in A12, is characterized in that the control image depth modulation module controls each electronically controlled dimming unit in each layer of electronically controlled dimming boards to adjust to transmission according to different depths of field corresponding to different areas of image light state or scatter state, specifically:

Control the electronically controlled dimming unit in the corresponding area of the electronically controlled dimming board corresponding to the depth of field corresponding to the image light in a certain area to adjust to the scattering state, and adjust the electronically controlled dimming unit in the corresponding area of the electronically controlled dimming board on other layers arranged in a stack to transmission state.

Claims (10)

1. An image depth modulation module, characterized in that it comprises stacked multi-layer electronically controlled dimming boards, each layer of electronically controlled dimming boards is composed of several electronically controlled dimming units, and each electrically controlled dimming unit has Independent switch, any electronically controlled dimming unit on different electronically controlled dimming boards can be independently adjusted to the transmission state or scattering state; When the image depth modulation module is working, the electronically controlled dimming units in the electronically controlled dimming panels of each layer are cooperatively adjusted to be in a transmission state or a scattering state. 2. The image depth modulation module according to claim 1, wherein the electronically controlled dimming unit is a polymer stabilized liquid crystal photoelectric unit or a polymer dispersed liquid crystal photoelectric unit. 3. The image depth modulation module according to claim 2, wherein the multi-layer electronically controlled dimming boards are arranged in parallel and at intervals. 4. A display module, characterized in that it comprises an image generation module, the image depth modulation module and an objective lens system according to any one of claims 1 to 3, the image light generated by the image generation module first passes through the image depth The modulation module is emitted through the objective lens system. 5. The display module according to claim 4, wherein each electronically controlled dimming unit on each layer of the electronically controlled dimming board corresponds to one or more pixels generated by the image generating module. 6 . The display module according to claim 5 , wherein the image depth modulation module comprises 12 layers of electronically controlled dimming boards stacked. 7. The display module according to any one of claims 4 to 6, wherein the imaging distance _Pn of each layer of electronically controlled dimming panels is designed according to the following formula:

Among them, L is the pupil diameter of the human eye, ε represents the resolution of the human eye, n is the number of layers of the electronically controlled dimming board, and when n is 1, it represents the first layer of the electronically controlled dimming board closest to the objective lens system. 8. A near-eye display device, comprising one or two groups of near-eye display optical systems, characterized in that each group of near-eye display optical systems includes a set of display modules and light guides as claimed in any one of claims 4 to 7 system, the image light generated by the image generation module first passes through the image depth modulation module, and then enters the light guide system through the objective lens system, and then exits from the light guide system to the human eye. 9. The near-eye display device according to claim 8, wherein the near-eye display device further comprises a processor, and while the processor controls the image generation module to generate image light, it also controls the image depth modulation module to correspond to different regions of the image light. Different depths of field, control each electronically controlled dimming unit in each layer of electronically controlled dimming boards to adjust to a transmission state or a scattering state. 10. The near-eye display device according to claim 9, wherein the control image depth modulation module controls the adjustment of each electronically controlled dimming unit in each layer of electronically controlled dimming panels according to different depths of field corresponding to different areas of image light. is the transmission state or the scattering state, specifically: Control the electronically controlled dimming unit in the corresponding area of the electronically controlled dimming board corresponding to the depth of field corresponding to the image light in a certain area to adjust to the scattering state, and adjust the electronically controlled dimming unit in the corresponding area of the electronically controlled dimming board on other layers arranged in a stack to transmission state.

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