Display apparatus and imaging device

Abstract

A display apparatus and an imaging device (3). The display apparatus comprises: a liquid crystal diaphragm (2), wherein the liquid crystal diaphragm (2) comprises a plurality of liquid crystal units (20), and each liquid crystal unit (20) is configured to switch between a first state and a second state, the first state being used for transmitting light, and the second state being used for shielding light; and in the same moment, at least some of the liquid crystal units (20) in the liquid crystal diaphragm (2) are in the first state, and the other liquid crystal units (20) are in the second state; and a plurality of imaging assemblies (1), wherein the plurality of imaging assemblies (1) are located on the same side of the liquid crystal diaphragm (2), each imaging assembly (1) comprises an imaging lens group (11) and a signal detector (12), and the signal detector (12) is located on the side of the imaging lens group (11) that faces away from the liquid crystal diaphragm (2), and the signal detector (12) is used for receiving light transmitted through the liquid crystal diaphragm (2) and for converting an optical signal into an electrical signal. When different liquid crystal units (20) are in the first state, image points (S1, S2) corresponding to the same object point (S) are located at different positions of the signal detector (12), and thus the signal detector (12) can collect more complete direction information of the object point (S), so as to reconstruct stereoscopic information of the object point (S).

Description

Display device and imaging apparatus TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, in particular to a display device and an imaging apparatus. BACKGROUND

[0002] Light field is a physical quantity that can describe the distribution of light in space, which can reflect the direction information and intensity information of light rays. Image acquisition and imaging technology based on light field is called light field imaging technology, which can obtain the three-dimensional information of an object based on the direction information and intensity information of light rays reflected by each point of the object.

[0003] Currently, there are mainly two means for collecting light field information: one is light field acquisition based on a camera array, which decouples the anisotropic light rays within a certain angle of the same point on the surface of an object through multiple lenses and discretizes them into multiple light rays for recording respectively. This scheme has the advantages of large parallax and high single-point resolution, but has the defects of high hardware cost and large volume. The other is light field acquisition based on a microlens array, which adds a microlens array between a sensor and an imaging lens. The microlens array discretizes and decouples the light rays emitted in different directions within a certain angle range of any point on the surface of an object, so that the sensor can record the intensity of light rays in different directions at the same time. This scheme has the advantages of small volume and single-shot imaging, but has the defects of low single-point resolution and small parallax.

[0004] SUMMARY

[0005] The present application provides a display device and an imaging apparatus to collect and restore the three-dimensional information of an object, so as to achieve a more realistic display effect.

[0006] In a first aspect, the present application provides a display device, which comprises:

[0007] A liquid crystal diaphragm, which comprises a plurality of liquid crystal units, the liquid crystal units being used to switch between a first state and a second state, the first state being transparent and the second state being opaque; at the same time, at least part of the liquid crystal units in the liquid crystal diaphragm are in the first state, and the other part of the liquid crystal units are in the second state.

[0008] A plurality of imaging assemblies, which are located on the same side of the liquid crystal diaphragm, each imaging assembly comprising an imaging lens group and a signal detector, the signal detector being located on the side of the imaging lens group away from the liquid crystal diaphragm, used to receive the light transmitted by the liquid crystal diaphragm and convert the optical signal into an electrical signal.

[0009] In some embodiments of the present application, the liquid crystal diaphragm comprises a plurality of regions, each of the regions comprising a plurality of liquid crystal cells, and each of the regions corresponding to one of the imaging assemblies.

[0010] In some embodiments of the present application, the display device comprises a display region and a non-display region, the plurality of imaging assemblies are arranged in the non-display region, and the liquid crystal diaphragm is arranged at least in the non-display region.

[0011] In some embodiments of the present application, the imaging lens comprises a plurality of lenses.

[0012] In some embodiments of the present application, the imaging lens further comprises an optical path folding assembly, which is configured to reflect the light multiple times and then emit the light to the signal detector.

[0013] In some embodiments of the present application, the optical path folding assembly comprises, in sequence from the liquid crystal diaphragm, a partially reflective and partially transmissive layer, a phase delay layer, and a reflective polarizer, wherein the phase delay layer is configured to delay the phase of the incident light by π / 2, and the reflective polarizer is configured to reflect a first polarized light and transmit a second polarized light, the first polarized light and the second polarized light having different polarized directions.

[0014] In some embodiments of the present application, the width of the liquid crystal cell is greater than 200 μm.

[0015] In some embodiments of the present application, the liquid crystal diaphragm comprises a liquid crystal layer and electrode layers respectively arranged on both sides of the liquid crystal layer.

[0016] The electrode layers are made of transparent conductive material, or the electrode layers are made of non-transparent conductive material, the electrode layers comprise a plurality of pixel electrodes, and the liquid crystal diaphragm further comprises a plurality of light shielding portions, the plurality of light shielding portions are arranged on the side of the electrode layers away from the liquid crystal layer, and the plurality of light shielding portions are arranged one-to-one corresponding to the plurality of pixel electrodes.

[0017] In some embodiments of the present application, the width of the light shielding portion is greater than 100 μm.

[0018] In a second aspect, the present application provides an imaging device, comprising: a liquid crystal diaphragm comprising a plurality of liquid crystal cells, the liquid crystal cells being configured to switch between a first state and a second state, the first state being transparent and the second state being opaque; at the same time, at least part of the liquid crystal cells in the liquid crystal diaphragm are in the first state, and the other part of the liquid crystal cells are in the second state.

[0019] A signal detector configured to receive the light transmitted by the liquid crystal diaphragm and convert the optical signal into an electrical signal.

[0020] In some embodiments of the present application, the imaging device further comprises a lens group, the lens group comprising at least one lens, the lens group being located between the liquid crystal diaphragm and the signal detector; or, when the lens group comprises a plurality of lenses, the liquid crystal diaphragm is located between two adjacent lenses in the plurality of lenses.

[0021] The present application has the following advantages:

[0022] The present application provides a display device and an imaging device, wherein the display device comprises: a liquid crystal diaphragm, the liquid crystal diaphragm comprising a plurality of liquid crystal units, the liquid crystal units being used to switch between a first state and a second state, the first state being used for light transmission and the second state being used for light shielding; at the same time, at least part of the liquid crystal units in the liquid crystal diaphragm are in the first state and the other part of the liquid crystal units are in the second state; a plurality of imaging assemblies, the plurality of imaging assemblies being located on the same side of the liquid crystal diaphragm, the imaging assembly comprising an imaging lens group and a signal detector, the signal detector being located on the side of the imaging lens group away from the liquid crystal diaphragm, used to receive light transmitted by the liquid crystal diaphragm and convert the light signal into an electric signal. When different liquid crystal units are in the first state, the image points corresponding to the same object point are located at different positions of the signal detector, so that the signal detector can collect more complete directional information of the object point, and further obtain the three-dimensional information of the object point. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings introduced below are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0024] Fig. 1 is a structural schematic diagram of a display device provided by an embodiment of the present application;

[0025] Fig. 2 is a schematic diagram of an imaging principle provided by an embodiment of the present application;

[0026] Fig. 3 is a schematic diagram of an imaging principle provided by an embodiment of the present application;

[0027] Fig. 4 is a schematic diagram of an imaging effect provided by an embodiment of the present application;

[0028] Fig. 5 is a structural schematic diagram of a liquid crystal diaphragm provided by an embodiment of the present application;

[0029] Fig. 6 is a structural schematic diagram of a liquid crystal diaphragm provided by an embodiment of the present application;

[0030] Fig. 7 is a schematic diagram of a simulation result provided by an embodiment of the present application;

[0031] FIG. 8 is a schematic diagram of another simulation result according to an embodiment of the present application;

[0032] FIG. 9 is a schematic diagram of another simulation result according to an embodiment of the present application;

[0033] FIG. 10 is a schematic diagram of a structure of an imaging lens according to an embodiment of the present application;

[0034] FIG. 11 is a schematic diagram of a structure of another imaging lens according to an embodiment of the present application;

[0035] FIG. 12 is a schematic diagram of a structure of an imaging device according to an embodiment of the present application;

[0036] FIG. 13 is a schematic diagram of a structure of another imaging device according to an embodiment of the present application;

[0037] FIG. 14 is a schematic diagram of a structure of a near-eye display device according to an embodiment of the present application;

[0038] Legend of reference signs:

[0039] AA - display region, AA' - non-display region, 1 - imaging assembly, 11 - imaging lens, 12 - signal detector, 2 - liquid crystal aperture, S - object point, S1 - first image point, S2 - second image point, 20 - liquid crystal cell, T - light transmission region, T1 - first light transmission region, T2 - second light transmission region, T3 - third light transmission region, L - lens, 110 - light path folding assembly, 111 - partially reflective partially transmissive layer, 112 - phase delay layer, 113 - reflective polarizing layer, 3 - imaging device, 31 - first imaging device, 32 - second imaging device. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. And the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, if necessary. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0041] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The words "first", "second", and similar words of distinction do not necessarily imply any actual order or sequence or importance, but are used to distinguish one element from another. The words "comprise", "comprising", "include", "including" and similar words of degree express the meaning of "including but not limited to", and do not exclude other elements or articles. The words "connect" or "connected" or similar words do not necessarily imply a physical or mechanical connection, but can include an electrical connection, whether direct or indirect.

[0042] It should be noted that the size and shape of the figures in the drawings do not reflect the true proportions, but are intended to illustrate the content of the present application. The same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout the drawings.

[0043] In order to facilitate the understanding of the technical solutions provided by the embodiments of the present application, the application scenario will be described first. The display device provided by the embodiments of the present application is a 3D display device, which has the functions of light field information acquisition and light field display. FIG. 1 is a structural schematic diagram of a display device provided by an embodiment of the present application. As shown in FIG. 1, the display device includes a display area AA and a non-display area AA'. The display area AA is used to display a 3D stereoscopic image to realize the function of light field display. The non-display area AA' is used to set an imaging assembly 1 to realize the function of light field information acquisition. For example, the imaging assembly 1 can be set in the non-display area AA' at the top of the display device. The light field information collected by the imaging assembly 1 is reconstructed into a display image after image processing technology processing, and 3D stereoscopic display is performed in the display area AA of the display device.

[0044] For example, the display device can be a television (TV), a computer (PC), a monitor (Monitor), etc., which is used to realize functions such as 3D video call, 3D monitoring or 3D preview of shooting, etc. The type of the display device can be one of, but not limited to, a Light Emitting Diode (LED) display device, a Liquid Crystal Display (LCD) or an Organic Light-Emitting Diode (OLED) display device, etc. The liquid crystal diaphragm 2 is at least set in the non-display area AA' of the display device. When the liquid crystal display device is used, the liquid crystal diaphragm 2 can be designed integrally with the liquid crystal layer of the display area AA, and the two functions of the liquid crystal diaphragm 2 as a diaphragm and controlling display are realized by partition control of the liquid crystal layer.

[0045] The display device can be integrated with a chip for processing images, or the display device can be connected to a computer for processing the collected light field information and controlling the display area AA to display the processed 3D stereoscopic image. The display area AA can be provided with a grating, a microlens or the like to provide a stereoscopic display effect. The embodiments of the present application improve the components for collecting light field information in the display device, and the specific structure of the display area AA can be designed according to actual needs, which is not limited herein.

[0046] FIG. 2 is a schematic diagram of an imaging principle according to an embodiment of the present application; and FIG. 3 is another schematic diagram of an imaging principle according to an embodiment of the present application.

[0047] As shown in FIGS. 1-3, the display device provided by the embodiments of the present application includes a liquid crystal diaphragm 2 and a plurality of imaging assemblies 1. The plurality of imaging assemblies 1 are located on the same side of the liquid crystal diaphragm 2. The imaging assembly 1 includes an imaging lens group 11 and a signal detector 12. The imaging lens group 11 is used to change the direction of light passing through the liquid crystal diaphragm 2 to form an image. The signal detector 12 is located on the side of the imaging lens group 11 away from the liquid crystal diaphragm 2, and is used to receive light passing through the liquid crystal diaphragm 2 and the imaging lens group 11, and convert the light signal into an electrical signal to obtain the light field information of the imaging object. Exemplarily, the type of the signal detector 12 includes but is not limited to one of a charge-coupled device (CCD), a complementary metal-oxide-semiconductor (CMOS), and the like. The signal detector 12 can have an image processing function.

[0048] The liquid crystal diaphragm 2 is a diaphragm with a variable light transmission position. By applying different electrical signals to the liquid crystal diaphragm 2, the position of the light transmission area of the liquid crystal diaphragm 2 can be changed, thereby limiting the incident range of light and controlling the intensity and distribution of light. When the position of the light transmission area of the liquid crystal diaphragm 2 changes, the position of the image point corresponding to the same object point S on the signal detector 12 also changes. For example, for the same object point S, referring to FIG. 2, the object point S is imaged by the imaging lens group 11 on the signal detector 12 at a first image point S1. Referring to FIG. 3, the position of the light transmission area T in the liquid crystal diaphragm 2 is changed, and the object point S is imaged by the imaging lens group 11 on the signal detector 12 at a second image point S2. The positions of the first image point S1 and the second image point S2 are different.

[0049] FIG. 4 is a schematic diagram of an imaging effect according to an embodiment of the present application.

[0050] Based on the imaging principle shown in FIG. 2 and FIG. 3, the signal detector 12 can collect images of the photographed object at multiple angles. For example, as shown in FIG. 4, the first light transmission region T1 of the liquid crystal diaphragm 2 is opened at t1, and the signal detector 12 can obtain a first image. The second light transmission region T2 of the liquid crystal diaphragm 2 is opened at t2, and the signal detector 12 can obtain a second image. The third light transmission region T3 of the liquid crystal diaphragm 2 is opened at t3, and the signal detector 12 can obtain a third image. The first image, the second image, and the third image are images of the photographed object that can be observed at different angles.

[0051] As can be seen, by controlling the liquid crystal diaphragm 2 to open different light transmission regions at different times, images of the photographed object at different angles can be obtained. When the number of images is sufficient, a stereoscopic image of the photographed object can be restored through image processing.

[0052] FIG. 5 is a schematic structural diagram of a liquid crystal diaphragm according to an embodiment of the present application; and FIG. 6 is another schematic structural diagram of a liquid crystal diaphragm according to an embodiment of the present application.

[0053] In the embodiment, the liquid crystal diaphragm 2 includes a plurality of liquid crystal units 20. The liquid crystal diaphragm 2 can include a plurality of regions, each region including a plurality of liquid crystal units 20. Each region is provided with one imaging assembly 1, or each imaging assembly 1 can be provided with one liquid crystal diaphragm 2.

[0054] As shown in FIG. 5 and FIG. 6, the liquid crystal unit 20 can be switched between a first state and a second state under the control of an electrical signal, where the first state can be used for light transmission, and the second state can be used for light blocking. At the same time, at least part of the liquid crystal units 20 in the liquid crystal diaphragm 2 are in the first state, and the other part of the liquid crystal units 20 are in the second state. For example, the liquid crystal units 20 located in the light transmission region T of the liquid crystal diaphragm 2 are all in the first state, while the liquid crystal units 20 located in other regions of the liquid crystal diaphragm 2 are all in the second state, so that the light is limited to only being incident from the light transmission region T of the liquid crystal diaphragm 2.

[0055] In a specific implementation, as shown in FIG. 5, a single liquid crystal unit 20 can be controlled to transmit light, or as shown in FIG. 6, a plurality of adjacent liquid crystal units 20 can be controlled to transmit light at the same time, that is, the light transmission region T can include one or more liquid crystal units 20. By changing the electrical signal applied to the liquid crystal diaphragm 2 at different times, different liquid crystal units 20 can be opened in turn, so as to move the position of the light transmission region T. Based on the imaging principle shown in FIG. 2 and FIG. 3, each object point S can be imaged at different positions of the signal detector 12, which is equivalent to photographing the same object point S from different angles, so that the stereoscopic information of each object point S can be obtained, and a 3D stereoscopic image can be formed after image processing.

[0056] It can be seen that in the display device provided in the embodiment of the present application, each imaging assembly 1 can capture the object from multiple angles to obtain the spatial information of the object, and multiple imaging assemblies 1 can cooperate to obtain more complete spatial information of the object, thereby improving the authenticity of the 3D stereoscopic image formed finally.

[0057] Generally, a conventional camera can only capture an object at a fixed angle, and if more complete spatial information of the object is to be obtained, multiple cameras need to be closely arranged. However, due to the size limitation of the camera itself, there is inevitably a gap between the components for imaging in adjacent cameras, which causes the captured image to lose part of the directional information, and the lost part of the directional information needs to be compensated in the subsequent image processing process, for example, by interpolation calculation. In the subsequent processing process, the amount of calculation required is large and the accuracy is difficult to guarantee. In the embodiment of the present application, a single imaging assembly 1 can capture the object from multiple angles, so that more complete directional information of the object can be obtained under the premise of arranging a smaller number of imaging assemblies 1, thereby guaranteeing the accuracy of image processing. For example, referring to FIG. 1, multiple imaging assemblies 1 can be arranged in the non-display area AA' of the display device in a set direction in sequence, and there can be a gap between adjacent imaging assemblies 1. At the same time, the imaging assembly 1 occupies a smaller space, which can improve the integration and aesthetics of the display device and is also conducive to reducing the cost.

[0058] The size of each liquid crystal unit 20 in the liquid crystal diaphragm 2 is an important parameter affecting the imaging effect of the imaging assembly 1. The liquid crystal diaphragm 2 is also simulated in the embodiment of the present application, and the imaging effect of the imaging assembly 1 is evaluated.

[0059] FIG. 7 is a schematic diagram of a simulation result provided in the embodiment of the present application; and FIG. 8 is a schematic diagram of another simulation result provided in the embodiment of the present application.

[0060] FIG. 7 shows the light field energy distribution of the imaging of the imaging assembly 1 when the liquid crystal unit 20 has different sizes, wherein the abscissa represents the angle information of the imaging, and the ordinate represents the energy information of the imaging. As shown in FIG. 5, when the size of the liquid crystal unit 20 in the first state is 25 μm*25 μm, the main order and the first order diffraction order of the light field are distributed with more energy, indicating that the light rays interfere and diffract when passing through the liquid crystal unit 20, causing ghosting in the imaging and affecting the display effect. As shown in FIG. 8, when the size of the liquid crystal unit 20 in the first state is 250 μm*250 μm, the energy of the light field is mainly distributed in the main order, indicating that the light rays do not interfere and diffract when passing through the liquid crystal unit 20, and the imaging is clearer. It can be seen that appropriately increasing the size of the liquid crystal unit 20 in the first state can avoid the interference and diffraction of the light rays passing through the liquid crystal diaphragm 2, thereby improving the clarity of the imaging.

[0061] FIG. 9 is a schematic diagram of another simulation result provided by the application.

[0062] FIG. 9 shows the energy ratio of the first diffraction order in the light field imaged by the imaging assembly 1 when the liquid crystal cell 20 has different sizes, wherein the abscissa represents the width of the liquid crystal cell 20, the size of the liquid crystal cell 20 is the square of its width, and the ordinate represents the energy ratio of the first diffraction in the light field. As can be seen from FIG. 8, as the size of the liquid crystal cell 20 in the first state gradually increases, the energy ratio of the first diffraction in the light field gradually decreases. It can be seen that appropriately increasing the size of the liquid crystal cell 20 in the first state can weaken the interference and diffraction phenomenon. When the width of the liquid crystal cell 20 in the first state is greater than 200 μm, the energy ratio of the first diffraction order in the light field is less than 5%. Therefore, the width of the liquid crystal cell 20 in the application embodiment can be designed to be greater than 200 μm.

[0063] It should be noted that the simulation results shown in FIGS. 7, 8 and 9 are all based on the case that the light transmission region T of the liquid crystal diaphragm 2 includes one liquid crystal cell 20. When the plurality of adjacent liquid crystal cells 20 are controlled to be in the first state, the width and size described above are the width and size of the light transmission region T, that is, the width and size of the whole of the plurality of liquid crystal cells 20 in the first state.

[0064] In some embodiments of the application, the liquid crystal diaphragm 2 includes a liquid crystal layer and electrode layers respectively located on both sides of the liquid crystal layer. The electrode layers can be made of transparent conductive material to improve the utilization efficiency of light, or the electrode layers can be made of non-transparent conductive material, such as one or more of copper, aluminum, silver and other metal materials. The electrode layers include a plurality of pixel electrodes. Since the metal material has a high reflectivity to light, the liquid crystal diaphragm 2 can further include a plurality of light shielding portions to avoid the reflected light affecting the imaging effect. The plurality of light shielding portions are located on the side of the electrode layer away from the liquid crystal layer, and the plurality of light shielding portions are arranged one by one corresponding to the plurality of pixel electrodes. For example, the width of the light shielding portion is greater than 100 μm, and optionally, the size of the light shielding portion is greater than 200 μm.

[0065] FIG. 10 is a structural schematic diagram of an imaging lens provided by an embodiment of the application.

[0066] As shown in FIG. 10, the imaging lens 11 can include a plurality of lenses L arranged in sequence along the light path propagation direction. The light transmitted through the liquid crystal diaphragm 2 is incident to the signal detector 12 after being refracted by the plurality of lenses L. This design has a simple structure and a large amount of light, which is conducive to improving the brightness and contrast of imaging.

[0067] FIG. 11 is a structural schematic diagram of another imaging lens provided by an embodiment of the application.

[0068] As shown in FIG. 11, the imaging lens group 11 can include a plurality of lenses L and a light path folding assembly 110 for reflecting the light multiple times before exiting to the signal detector 12, which can effectively reduce the thickness of the imaging lens group 11 and facilitate the realization of a thin design.

[0069] For example, the light path folding assembly 110 can include, in sequence from the direction gradually away from the liquid crystal diaphragm 2, a partially reflective and partially transmissive layer 111, a phase delay layer 112, and a reflective polarizer layer 113, wherein the phase delay layer 112 is configured to delay the phase of the incident light by π / 2 before exiting, and the reflective polarizer layer 113 is configured to reflect first polarized light and transmit second polarized light, the polarization directions of the first and second polarized light being different.

[0070] The light path in the light path folding assembly 110 is as follows: the circularly polarized light is incident on the partially reflective and partially transmissive layer 111, the circularly polarized light transmitted by the partially reflective and partially transmissive layer 111 is converted into first polarized light by the phase delay layer 112, the first polarized light is linearly polarized light, for example, P light, the first polarized light is reflected by the reflective polarizer layer 113, and then converted into circularly polarized light by the phase delay layer 112, the circularly polarized light is reflected by the partially reflective and partially transmissive layer 111, converted into second polarized light by the phase delay layer 112, the second linearly polarized light is linearly polarized light, for example, S light, the polarization direction of the second polarized light is perpendicular to that of the first polarized light, and the second polarized light is transmitted by the reflective polarizer layer 113 and exits.

[0071] Alternatively, linearly polarized light is incident on the partially reflective and partially transmissive layer 111, the linearly polarized light transmitted by the partially reflective and partially transmissive layer 111 is converted into first polarized light by the phase delay layer 112, the first polarized light is circularly polarized light, for example, left-handed circularly polarized light, the first polarized light is reflected by the reflective polarizer layer 113, and then converted into linearly polarized light by the phase delay layer 112, the linearly polarized light is reflected by the partially reflective and partially transmissive layer 111, converted into second polarized light by the phase delay layer 112, the second linearly polarized light is circularly polarized light, for example, right-handed circularly polarized light, the rotation direction of the second polarized light is opposite to that of the first polarized light, and the second polarized light is transmitted by the reflective polarizer layer 113 and exits.

[0072] In specific implementations, the partially reflective and partially transmissive layer 111, the phase delay layer 112, and the reflective polarizer layer 113 can be disposed on the surface of a lens L or between adjacent lenses L, and a polarizer needs to be disposed on the light-incident side of the partially reflective and partially transmissive layer 111 to convert the incident natural light into circularly polarized light or linearly polarized light to meet the requirements of the light path folding assembly 110 on the polarization state of the incident light. The polarizer can be disposed on the light-incident side of the liquid crystal diaphragm 2 or between the liquid crystal diaphragm 2 and the imaging assembly 1, which is not limited herein.

[0073] Based on the same concept, the application further provides an imaging device, which comprises a liquid crystal diaphragm 2 and a signal detector 12. The liquid crystal diaphragm 2 comprises a plurality of liquid crystal units 20, which can be switched between a first state for transmitting light and a second state for blocking light. At the same time, at least part of the liquid crystal units 20 in the liquid crystal diaphragm 2 are in the first state, and the other part of the liquid crystal units 20 are in the second state. The signal detector 12 is used to receive the light transmitted by the liquid crystal diaphragm 2 and convert the light signal into an electrical signal. The working principle and technical effects of the liquid crystal diaphragm 2 and the signal detector 12 can refer to the working principle and technical effects of the liquid crystal diaphragm 2 and the signal detector 12 in the display device described above, which will not be repeated here.

[0074] FIG. 12 is a structural schematic diagram of an imaging device according to an embodiment of the application; and FIG. 13 is a structural schematic diagram of another imaging device according to an embodiment of the application.

[0075] As shown in FIGS. 12 and 13, in the embodiments of the application, the imaging device further comprises a lens group, which comprises at least one lens L. Referring to FIG. 11, the lens group can be located between the liquid crystal diaphragm 2 and the signal detector 12, or, referring to FIG. 12, when the lens group comprises a plurality of lenses L, the liquid crystal diaphragm 2 can be located between two adjacent lenses L in the plurality of lenses L. The position of the liquid crystal diaphragm 2 can be set according to specific requirements, which is not limited in the embodiments of the application.

[0076] In specific implementation, a single imaging device can be used to obtain information of the photographed object at multiple angles, or multiple imaging devices can be arranged in a certain manner to obtain information of the photographed object at more angles, so as to improve the accuracy of image processing and make the restored 3D stereoscopic image closer to the real object. At the same time, since one imaging device can photograph images at multiple angles, even if there is a certain physical interval between adjacent imaging devices, the directional information of the photographed object will not be lost.

[0077] For example, the imaging device provided by the embodiments of the application can be applied to a near-eye display device. The near-eye display device comprises a display screen and an imaging device. The display screen is used to display images, and the imaging device is used to photograph images of a real environment. The near-eye display device combines the display images of the display screen and the real images photographed by the imaging device based on the extended reality (XR) technology, so that the user can normally observe the external scene and interact with the surrounding environment when wearing the near-eye display device.

[0078] Generally, in the near-eye display device, because the distance between the display screen and the human eye is fixed, when the human eye tries to focus on the display image at different depths, the line of sight position and the focus position of the human eye are different, which causes the vergence-accommodation conflict. The existence of the vergence-accommodation conflict forces the brain to synthesize the information that the line of sight and the focus point are not in the same position, and long time can cause visual fatigue, dizziness, headache and other adverse reactions, affecting the experience.

[0079] Fig. 14 is a structural schematic diagram of a near-eye display device provided by an embodiment of the present application.

[0080] As shown in Fig. 14, the near-eye display device provided by the embodiment of the present application can be a head-mounted device, and the near-eye display device is provided with an imaging device 3, for example, a first imaging device 31 and a second imaging device 32 corresponding to the left eye and the right eye of a person, respectively. The first imaging device 31 and the second imaging device 32 can obtain the information of the photographed object from multiple angles, so that a stereoscopic real image can be restored through image processing technology.

[0081] Meanwhile, the near-eye display device in the embodiment of the present application uses a light field display screen to display images, for example, a microstructure is arranged in the display screen, the intensity and direction of the light emitted by each point on the display screen are controlled, and the human eye can observe that the light emitting point is at a certain depth in space, thereby realizing light field display. When multiple light rays of different directions emitted by the display screen enter the human eye at the same time, the human eye can focus to a certain depth position, rather than the position of the display screen, so that the vergence conflict can be eliminated.

[0082] The embodiment of the present application can solve the problem of vergence-accommodation conflict through the cooperation of the light field display screen and the imaging device, and the display image and the real image are both stereoscopic images, and the combination of the two can provide the user with a more realistic and immersive experience.

[0083] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all the preferred embodiments and all the changes and modifications falling within the scope of the present application.

[0084] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and the equivalent technology thereof, the present application also intends to include these modifications and variations.

Claims

1. A display device, wherein, The display device comprises: a liquid crystal diaphragm comprising a plurality of liquid crystal units, the liquid crystal units being used for switching between a first state for transmitting light and a second state for blocking light; at the same time, at least part of the liquid crystal units in the liquid crystal diaphragm are in the first state, and the other part of the liquid crystal units are in the second state; a plurality of imaging assemblies located on the same side of the liquid crystal diaphragm, the imaging assembly comprising an imaging lens group and a signal detector, the signal detector being located on the side of the imaging lens group away from the liquid crystal diaphragm, used for receiving light transmitted by the liquid crystal diaphragm and converting the optical signal into an electrical signal.

2. The display device of claim 1, wherein, The liquid crystal diaphragm comprises a plurality of regions, each of the regions comprising a plurality of liquid crystal units, and each of the regions corresponding to one imaging assembly.

3. The display device of claim 1, wherein, The display device comprises a display region and a non-display region, the plurality of imaging assemblies are arranged in the non-display region, and the liquid crystal diaphragm is arranged at least in the non-display region.

4. A display device as claimed in any one of claims 1 to 3, wherein, The imaging lens group comprises a plurality of lenses.

5. The display device of claim 4, wherein, The imaging lens group further comprises a light path folding assembly, the light path folding assembly being used for reflecting the light multiple times and then emitting the light to the signal detector.

6. The display device of claim 5, wherein, The light path folding assembly comprises a partially reflective and partially transmissive layer, a phase delay layer and a reflective polarizing layer arranged in sequence in a direction gradually away from the liquid crystal diaphragm, wherein the phase delay layer is used for delaying the phase of the incident light by π / 2 before emitting the light, and the reflective polarizing layer is used for reflecting first polarized light and transmitting second polarized light, the polarization directions of the first polarized light and the second polarized light being different.

7. A display device as claimed in any one of claims 1-6, wherein The width of the liquid crystal unit is greater than 200 μm.

8. A display device as claimed in any one of claims 1-7, wherein, The liquid crystal diaphragm comprises a liquid crystal layer and electrode layers respectively located on both sides of the liquid crystal layer. The electrode layer adopts a transparent conductive material, or the electrode layer adopts a non-transparent conductive material, the electrode layer comprises a plurality of pixel electrodes, and the liquid crystal diaphragm further comprises a plurality of light shielding portions, the plurality of light shielding portions being arranged on the side of the electrode layer away from the liquid crystal layer, and the plurality of light shielding portions and the plurality of pixel electrodes are arranged one by one.

9. The display device of claim 8, wherein, The width of the light shielding portion is greater than 100 μm.

10. An image forming apparatus, comprising: The imaging device comprises: a liquid crystal diaphragm comprising a plurality of liquid crystal units, the liquid crystal units being used for switching between a first state for transmitting light and a second state for blocking light; at the same time, at least part of the liquid crystal units in the liquid crystal diaphragm are in the first state, and the other part of the liquid crystal units are in the second state; 11. The imaging device of claim 10, wherein, a signal detector, used for receiving light transmitted by the liquid crystal diaphragm and converting an optical signal into an electrical signal. The imaging device further comprises a lens group, the lens group comprising at least one lens, the lens group being located between the liquid crystal diaphragm and the signal detector; or when the lens group comprises a plurality of lenses, the liquid crystal diaphragm is located between two adjacent lenses in the plurality of lenses.

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