Optical module and display device

Abstract

An optical module (10) and a display device (100). The optical module (10) is configured to adjust display light of a display image, so that the display position of the display image corresponds to the sampling position of the display image when rasterized. The optical module (10) comprises a polarization modulator (11), a refraction apparatus (12) and an optical path adjustment assembly (13). The polarization modulator (11) is configured to adjust the polarization angle of the display light to be a target polarization angle, the sampling positions of continuous multiple display image frames are different, and the target polarization angle corresponds to the sampling position of the current display image frame; the refraction device is configured to refract the display light, and the target polarization angle corresponds to the refraction angle; and the optical path adjustment assembly is configured to converge the display light so as to enable emergent light to be emitted to a preset area.

Description

Optical modules and display devices

[0001] Priority information

[0002] This application claims priority and benefits of the patent application with patent application number "202311686039.9" filed with the State Intellectual Property Office of China on December 8, 2023, and the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the field of virtual reality technology, and more specifically, to an optical module and a display device. Background Art

[0004] In the field of VR technology, there is a method of increasing the resolution of VR devices by splicing multiple graphics cards and multiple displays to project different sampled images for superposition. However, the system structure of multiple graphics cards and multiple displays is complex, and it takes up a large physical space, making the VR device too heavy. In addition, the hardware cost is high and the system adjustability is poor. Summary of the Invention

[0005] An embodiment of the present application provides an optical module and a display device, which are configured to adjust the display light of a displayed image so that the display position of the displayed image corresponds to the sampling position when the displayed image is rasterized. The display light of the displayed image is converged through the polarization modulator, refraction device and optical path adjustment component of the optical module, so that when displaying multiple consecutive frames, not only the display resolution can be improved, but also the continuity and smooth transition of the displayed image can be guaranteed, thereby ensuring the correct visual effect.

[0006] The optical module of the embodiment of the present application is configured to adjust the display light of the display image so that the display position of the display image corresponds to the sampling position when the display image is rasterized. The optical module includes: a polarization modulator, configured to adjust the polarization angle of the display light to a target polarization angle, the sampling positions of multiple consecutive frames of the display image are different, and the target polarization angle corresponds to the sampling position of the display image in the current frame; a refraction device, configured to refract the display light, the target polarization angle and the refraction angle correspond; and an optical path adjustment component, configured to converge the display light so that the outgoing light is directed to a preset area.

[0007] In some embodiments, the polarization modulator, the refraction device, and the optical path adjustment component are arranged in sequence along an emitting direction of the display light of the display image.

[0008] In some embodiments, the optical path adjustment component includes a Fresnel lens.

[0009] In some embodiments, the optical path adjustment component includes a folded optical path component.

[0010] In some embodiments, the polarization modulator includes a first polarization modulator and a second polarization modulator, the refraction device is located between the first polarization modulator and the second polarization modulator, and the first polarization modulator, the refraction device, the second polarization modulator and the folded optical path component are arranged in sequence along the exit direction of the display light of the display image.

[0011] In some embodiments, the optical module also includes a first phase delay plate located between the second polarization modulator and the folded optical path component, and the first phase delay plate is configured to adjust the linearly polarized light entering the folded optical path component to circularly polarized light. The phase adjustment amount of the first polarization modulator and the second polarization modulator is π, so that the polarization angles of the light entering the first phase delay plate are consistent.

[0012] In some embodiments, the folded optical path component, the polarization modulator, and the refraction device are arranged in sequence along the emission direction of the display light of the display image.

[0013] In some embodiments, the optical module also includes a second phase delay plate, and the second phase delay plate, the folded optical path component, the polarization modulator and the refraction device are arranged in sequence along the output direction, and the second phase delay plate is configured to adjust the linearly polarized light entering the folded optical path component into circularly polarized light.

[0014] In some embodiments, the refractive device includes a birefringent crystal, and the thickness of the birefringent crystal is determined according to a preset magnification of the virtual image relative to the display screen, a pixel size of the display, a preset distance from the birefringent crystal to the human eye, a preset distance from the human eye to the virtual image, and a preset dispersion angle.

[0015] In some embodiments, the folded optical path assembly includes a beam splitter, a third phase retarder, and a reflective polarizing film, the beam splitter being configured to transmit a first preset proportion of light and reflect a second preset proportion of light, the sum of the first preset proportion and the second preset proportion being 1, the third phase retarder being configured to switch one of linearly polarized light and circularly polarized light to the other, and the reflective polarizing film being configured to transmit linearly polarized light of a first preset polarization angle and reflect linearly polarized light of a second preset polarization angle.

[0016] In some embodiments, the polarization modulator, the refraction device and the folded optical path component are arranged in sequence along the exit direction of the display light of the displayed image, and the optical module also includes a fourth phase delay plate located between the refraction device and the folded optical path component, and the fourth phase delay plate is configured to adjust the linearly polarized light entering the folded optical path component to circularly polarized light, and generate a first preset phase delay.

[0017] In some embodiments, the polarization modulator includes a third polarization modulator and a fourth polarization modulator, the folded optical path assembly includes a beam splitter, the fourth polarization modulation device and a reflective polarization film, the third polarization modulator, the refraction device, the fourth phase delay plate, the beam splitter, the fourth polarization modulation device and the reflective polarization film are arranged in sequence along the exit direction; the beam splitter is configured to transmit a first preset proportion of light and reflect a second preset proportion of light, the sum of the first preset proportion and the second preset proportion is 1, the reflective polarization film is configured to transmit linearly polarized light of a first preset polarization angle and reflect linearly polarized light of a second preset polarization angle; the third polarization modulator, the fourth phase delay plate and the fourth polarization modulator cooperate to adjust the circularly polarized light passing through the folded optical path assembly to linearly polarized light of the first preset polarization angle.

[0018] In some embodiments, the sampling positions include a first sampling position and a second sampling position, and the displayed image includes a first display image corresponding to the first sampling position and a second display image corresponding to the second sampling position; the first preset phase delay is π / 2, and when the first display image is displayed, the phase delay of the third polarization modulator is 0, and the phase delay of the fourth polarization modulator is π / 2; when the second display image is displayed, the phase delay of the third polarization modulator is π, and the phase delay of the fourth polarization modulator is -π / 2.

[0019] In some embodiments, the sampling positions include a first sampling position and a second sampling position, and the polarization modulator is configured to adjust the polarization angle of the display light to a first target polarization angle and a second target polarization angle, the first target polarization angle corresponds to the first sampling position, and the second target polarization angle corresponds to the second sampling position; the refraction device includes a birefringent crystal, and the display light at the first target polarization angle has a different first refraction angle of the birefringent crystal from the second refraction angle of the birefringent crystal, so that the first sampling position and the second sampling position respectively correspond to different display positions.

[0020] The display device according to the embodiment of the present application includes a display configured to display the display image; and the optical module according to any one of the above embodiments.

[0021] The display device of the embodiment of the present application also includes: a sampling rendering module, configured to generate the display image; a display control module, configured to control the polarization modulator to adjust the polarization angle of the display light to the target polarization angle by sending a control signal to the polarization modulator; a processor, the processor being used to send a current frame signal to the sampling rendering module and the display control module respectively to synchronize the sampling rendering module and the display control module. When the sampling rendering module and the display control module are synchronized, the target polarization angle corresponds to the sampling position of the display image of the current frame.

[0022] The optical module and display device of the embodiments of the present application modulate the polarization angle of the display light through the polarization modulator of the optical module, adjust the refraction angle of the display light through the refraction device, and converge the display light after polarization and refraction through the optical path adjustment component, so that the outgoing light is directed to a preset area (such as the area where the human eye is located). Since the target polarization angle corresponds to the sampling position when the display image is rasterized, and the refraction angle corresponds to the target polarization angle, the display light of the display image can be emitted at different refraction angles, so that the display positions of the display images of different frames are different, and continuous multi-frame display images are superimposed within the visual persistence time of the human eye. Without increasing the display screen, the display resolution can be improved.

[0023] Compared with the method of increasing the resolution of VR devices by splicing multiple graphics cards and multiple displays to project different sampled images for superposition, the present application generates multiple frames of display images after sampling and rendering different sampling positions of the current scene. When displaying, the display light of the display images of multiple frames with different sampling positions is adjusted through the optical module 10, so that the display position of the display image also changes in multiple frames. Therefore, through the visual persistence characteristics of the human eye, the images are superimposed in the human eye to achieve an improvement in resolution.

[0024] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] FIG1 is a schematic diagram of an application scenario of a display device according to certain embodiments of the present application;

[0027] FIG2 is a top cross-sectional view of a display device according to some embodiments of the present application;

[0028] FIG3 is a schematic structural diagram of an optical module according to certain embodiments of the present application;

[0029] FIG4 is a schematic structural diagram of an optical module according to certain embodiments of the present application;

[0030] FIG5 is a schematic structural diagram of an optical module according to certain embodiments of the present application;

[0031] FIG6 is a schematic diagram of a scene of an optical module according to certain embodiments of the present application;

[0032] FIG7 is a schematic structural diagram of an optical module according to certain embodiments of the present application;

[0033] FIG8 is a schematic diagram of a scenario of an optical module and a display device according to certain embodiments of the present application. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of the present application, and should not be understood as limiting the embodiments of the present application.

[0035] To facilitate understanding of this application, the following are explanations of the terms that appear in this application:

[0036] 1. Virtual reality technology (VR), also known as virtual reality or spiritual realm technology. Virtual reality technology encompasses computer, electronic information, and simulation technology. Its basic implementation method is based on computer technology, utilizing and integrating the latest developments in various high technologies such as three-dimensional graphics technology, multimedia technology, simulation technology, display technology, and servo technology. With the help of the graphics processing unit (GPU) in the VR device, the image in the current scene is processed to produce a realistic three-dimensional visual, tactile, olfactory and other sensory experiences in the virtual world, thereby giving people in the virtual world an immersive feeling. The technical solution provided in the embodiment of the present application is mainly used to enhance the resolution of VR devices without affecting the frame rate.

[0037] 2. Vertex processing: The vertices of 3D graphics have coordinates in three-dimensional space. Through linear algebra calculations, the coordinate data of each vertex in three-dimensional space is converted and drawn into the two-dimensional space of the display. At the same time, the color of the vertex is calculated for subsequent pixel color interpolation. This operation is called vertex processing.

[0038] 3. Rasterization: The primitive information generated during vertex processing is input into the rasterization stage. Primitives are assembled first, and then the fragments corresponding to the screen pixels covered by the primitives are determined through triangle traversal. After the rasterization stage, the primitives will be divided into basic units of pixel size, which are called fragments. Fragments are more like data representations of pixels. The final pixel is generated by the information in the fragments, and then the fragments are shaded by the fragment shader. When operating fragment by fragment, the fragments undergo a series of tests. The fragments that pass the test will be converted into pixels and finally presented in the frame buffer area.

[0039] 4. A Field Programmable Gate Array (FPGA) is a programmable logic device, which is a semiconductor chip consisting of a series of programmable logic gates. In the technical solution provided in the embodiments of this application, it is mainly used to send gate circuit signals to control the signal generator to change the state of the polarization modulator.

[0040] 5. Frame buffer: A video output device drives a video display device from a memory buffer containing complete frame data. The technical solution provided in the embodiment of the present application is mainly used to generate a display image after determining the required resolution size as the output frame through Framebuffer resampling.

[0041] 6. Fresnel lenses are thin lenses made of injection-molded polyolefin material. They have equidistant serrations on one side, which reflect or refract light within a specific spectral range. Fresnel lenses are used as the primary optical module in VR devices due to their thinness.

[0042] 7. Birefringent crystal. When a beam of light wave is projected onto the crystal interface, two refracted light beams are generally generated. This phenomenon is called birefringence. Due to the anisotropy of the crystal material, the dispersion angle of the two refracted light beams is related to the direction of the optical axis and the refractive index of the ordinary and extraordinary light of the crystal. The crystal that produces birefringence is called a birefringent crystal. The birefringent crystal mainly used in the technical solution provided in the embodiment of the present application is quartz crystal.

[0043] In order to solve the above technical problems, an embodiment of the present application provides an optical path module.

[0044] An application scenario of the technical solution of the present application will be first introduced below, as shown in Figure 1 , the optical path module provided by the present application can be applied to the application scenario shown in Figure 1 . The application scenario involves a display device 100 .

[0045] FIG1 exemplarily shows a display device 100 , and may actually include other numbers of display devices 100 , which is not limited in the embodiments of the present application.

[0046] In one embodiment, the display device 100 includes an optical module 10 , a display 20 , a processor 30 , and a memory 40 . The display 20 can display an image, and display light is emitted from the display 20 and enters the human eye through the optical module 10 .

[0047] In one embodiment, the processor 30 may be a graphics processing unit (GPU) 30 , and the GPU processor 30 performs sampling and rendering on the current scene to generate a scene image.

[0048] In one embodiment, the display 20 is used to display the scene image generated after sampling and rendering by the GPU processor 30.

[0049] In one embodiment, the display device 100 includes a sampling and rendering module 50 and a display control module 60, which can be synchronized by a frame signal so that the displayed image and the polarization angle of the light modulated by the polarization modulator can correspond.

[0050] In the field of VR technology, there is extensive research on time-division multiplexing-based pixel shifting and overlaying to enhance resolution. This method accumulates pixel position differences across each frame, rasterizing the pixels from different sampling positions before performing sampling and rendering to produce a continuous multi-frame display image.

[0051] The method of enhancing resolution based on time-division multiplexing pixel shifting and superposition can be as follows:

[0052] For example, display images generated by different sampling positions of multiple consecutive frames are divided into even frames and odd frames by frame sequence numbers. The even frames correspond to the generation of a first display image, and the odd frames correspond to the generation of a second display image. The sampling position corresponding to the first display image and the sampling position corresponding to the second display image are displaced by half a pixel in the diagonal direction of the pixel; and the total display time of the first display image and the second display image of the multiple consecutive frames is less than the preset human eye integration time. In this case, counting starts from frame 0, and the sampling position of frame 0 is set as the original sampling position. This is explained as an example:

[0053] Sampling rendering generally involves: taking the current scene as an example, a virtual three-dimensional (3D) scene built by an application, performing a view transformation on the current scene in the GPU, converting the three-dimensional coordinates of the 3D scene graph into two-dimensional coordinates, and converting one or more vertices into completely different basic graphics (or primitives), thereby generating many more vertices than the original. Primitives are then assembled through rasterization, and then triangle traversal is used to determine the fragments corresponding to the screen pixels covered by the primitives. Finally, the fragments are shaded and subjected to a series of tests based on different sampling positions to generate multiple frames of continuous display images of the current scene, which are then displayed on the monitor.

[0054] At frame 0, the original sampling position is sampled and rendered to obtain the first display image. The sampling position of frame 1 will be determined to be the sampling position of the second display image at a position that is half a pixel displaced from the original sampling position along the pixel diagonal direction relative to the original sampling position. The sampling position of frame 2 will be the same as that of frame 0, and the sampling position of frame 3 will be the same as that of frame 1. The sampling position of even frames is the same as that of frame 0, and the sampling position of odd frames is the same as that of frame 1.

[0055] After rasterization and shading are performed on even frames, the sampling position of rasterization is changed in odd frames (the position is moved half a pixel diagonally). During the rasterization stage, sampling and shading are performed based on the changed sampling position. Finally, the framebuffer is resampled to determine the corresponding resolution as the output frame. For example, assuming the resolution of the LCD display is n*n, based on the acquired frame signal, rasterization and shading are performed on even frames to obtain the first display image, and shading is performed on the changed sampling position of rasterization for odd frames to obtain the second display image. The framebuffer is resampled to determine the output of the n*n resolution display image to the display.

[0056] It is understandable that since it takes a certain integration time for an image to be formed on the retina, the inter-frame images can be superimposed on the retina during the integration time. At this time, due to the visual persistence characteristics of the human eye, the human eye obtains the image superimposed within the integration time. When the total display time of the continuous multi-frame display image is less than the preset human eye integration time, the resolution perceived by the human eye will exceed the original resolution of the screen, thereby achieving the effect of improving the resolution. Therefore, in the embodiment of the present application, the total display time of the continuous multi-frame display image is less than the preset human eye integration time.

[0057] The first display image of the even frame and the second display image of the odd frame are generated based on the different sampling positions during rasterization. Due to the different sampling positions, the pixel positions of the even and odd frames change. In order to ensure that the movement and deformation of objects in the current scene are correctly reflected in the rendering results and to ensure the continuity, smooth transition and correct presentation of the animation, the display light of the first display image or the display light of the second display image needs to be offset (splitting) accordingly. In this way, when the continuous display images of the multiple frames are superimposed on each other in the human eye based on the persistence characteristics of the human eye, the effect of improved resolution can be presented.

[0058] Therefore, the optical module 10 of the embodiment of the present application can obtain display images at different sampling positions based on the above-mentioned rasterized sampling rendering of different sampling positions, and adjust the display light of the display image.

[0059] The optical module 10 of the present application will be described in detail below:

[0060] Referring to FIG. 3 , an embodiment of the present application provides an optical module 10 configured to adjust the display light of a display image so that the display position of the display image corresponds to the sampling position when the display image is rasterized.

[0061] The optical module 10 includes a polarization modulator 11, a refraction device 12, and an optical path adjustment assembly 13. The polarization modulator 11 is configured to adjust the polarization angle of the display light to a target polarization angle. The sampling positions of multiple consecutive display frames are different, and the target polarization angle corresponds to the sampling position of the current display frame. The refraction device 12 is configured to refract the display light, and the target polarization angle corresponds to the refraction angle. The optical path adjustment assembly 13 is configured to converge the display light so that the outgoing light is directed to a predetermined area.

[0062] Optionally, the sampling positions include a first sampling position and a second sampling position, and the polarization modulator 11 is configured to adjust the polarization angle of the display light to a first target polarization angle and a second target polarization angle, the first target polarization angle corresponds to the first sampling position, and the second target polarization angle corresponds to the second sampling position; the refraction device 12 includes a birefringent crystal 12, and the display light of the first target polarization angle has a different first refraction angle at the birefringent crystal 12 and the display light of the second target polarization angle has a different second refraction angle at the birefringent crystal 12, so that the display positions corresponding to the first sampling position and the second sampling position are different.

[0063] The polarization angle includes a first polarization angle and a second polarization angle, the first polarization angle and the second polarization angle are different, the first polarization angle is 0°, and the second polarization angle is 90°; or, the first polarization angle is 90°, and the second polarization angle is 0°.

[0064] Specifically, the optical module 10 is configured to adjust the display light of the display image so that the display position of the display image corresponds to the sampling position when the display image is rasterized. The sampling position includes a first sampling position and a second sampling position, that is, the sampling position of each frame is the first sampling position or the second sampling position. There is a distance offset between the first sampling position and the second sampling position, for example, there is a half-pixel displacement between the first sampling position and the second sampling position in the diagonal direction of the pixel. The display image includes a first display image and a second display image, rasterization is performed at the first sampling position, and the first display image is generated by sampling rendering; rasterization is performed at the second sampling position, and the second display image is generated by sampling rendering.

[0065] The polarization modulator 11 is configured to adjust the polarization angle of the display light to a target polarization angle. The target polarization angle includes a first target polarization angle and a second target polarization angle. After completing sampling and rendering at different sampling positions to generate different display images, the display images are displayed through the display 20. The polarization angle of the display light emitted by the display image is adjusted when passing through the polarization modulator 11. The polarization angle of the display light of the first display image generated after completing sampling and rendering at the first sampling position is adjusted to the first target polarization angle after passing through the polarization modulator 11; the polarization angle of the second display image generated after completing sampling and rendering at the second sampling position is adjusted to the second target polarization angle after passing through the polarization modulator 11.

[0066] The refraction device 12 is configured to refract display light and includes a birefringent crystal 12, such as a quartz crystal 12. The refraction angle includes a first refraction angle and a second refraction angle, and the first refraction angle and the second refraction angle are different. By associating the refraction angle with the target polarization angle, with the first refraction angle corresponding to the first target polarization angle and the second refraction angle corresponding to the second target polarization angle, the display light of the first target polarization angle at the first refraction angle of the birefringent crystal and the display light of the second target polarization angle at the second refraction angle of the birefringent crystal are different. As a result, the display light corresponding to the first sampling position, after being refracted by the refraction device 12, exits at a different position than the display light corresponding to the second sampling position after being refracted by the refraction device 12.

[0067] The optical path adjustment component 13 is configured to converge the display light so that the outgoing light is directed to a preset area. The display light of the first display image generated after the first sampling position completes sampling rendering, and the display light of the second display image generated after the second sampling position completes sampling rendering, after being adjusted by the polarization modulator 11 and the refraction device 12 respectively, the outgoing light will have a relative position offset, and after passing through the optical path adjustment component 13, the outgoing light is converged and directed to the preset area and enters the human eye.

[0068] That is, the display light of the first display image generated by sampling and rendering at the first sampling position corresponds to light polarization at the first target polarization angle and light refraction at the first refraction angle; the display light of the second display image generated by sampling and rendering at the second sampling position corresponds to light polarization at the second target polarization angle and light refraction at the second refraction angle. Then, multiple consecutive frames are rasterized at the first sampling position, sampled and rendered to generate the first display image. After the display light of the first display image passes through the polarization modulator, the polarization angle of the display light is adjusted to the first target polarization angle. When the display light of the first display image passes through the refraction device 12, it is refracted at the first refraction angle. Rasterized at the second sampling position, sampled and rendered to generate the second display image. After the display light of the second display image passes through the polarization modulator 11, the polarization angle of the display light is adjusted to the second target polarization angle. When the display light of the second display image passes through the refraction device 12, it is refracted at the second refraction angle. In this way, the display light of the first display image and the display light of the second display image of multiple consecutive frames will be offset relative to the sampling position. Finally, they are converged by the optical path adjustment component and emitted to the preset area to form an image in the human eye. Then, the display image of multiple consecutive frames can achieve optical path splitting.

[0069] In this way, the polarization angle of the display light is modulated by the polarization modulator 11 of the optical module 10, the refraction device 12 adjusts the refraction angle of the display light, and the optical path adjustment component converges the display light after polarization and refraction, so that the outgoing light is directed to a preset area (such as the area where the human eye is located). Since the target polarization angle corresponds to the sampling position when the display image is rasterized, and the refraction angle corresponds to the target polarization angle, the display light of the display image can be emitted at different refraction angles, so that the display positions of the display images of different frames are different, and continuous multi-frame display images are superimposed within the visual persistence time of the human eye. Without increasing the display screen, the display resolution can be improved.

[0070] Compared with the method of increasing the resolution of VR devices by splicing multiple graphics cards and multiple displays to project different sampled images for superposition, the present application generates multiple frames of display images after sampling and rendering different sampling positions of the current scene. When displaying, the display light of the display images of multiple frames with different sampling positions is adjusted through the optical module 10, so that the display position of the display image also changes in multiple frames. Therefore, through the visual persistence characteristics of the human eye, the images are superimposed in the human eye to achieve an improvement in resolution.

[0071] Referring to FIG. 3 , in some embodiments, the polarization modulator 11 , the refraction device 12 , and the optical path adjustment component 13 are sequentially arranged along the emission direction of the display light of the displayed image.

[0072] The optical path adjustment component 13 includes a Fresnel lens 13 .

[0073] The refraction device 12 is a quartz crystal 12. After passing through the quartz crystal 12, P-polarized light propagates as o-light, and S-polarized light propagates as e-light. After entering the polarization modulator 11, the P-polarized light is adjusted to 0° (0 phase) to become P-polarized light, and then adjusted to 90° (π phase) to become S-polarized light. After entering the polarization modulator 11, the S-polarized light is adjusted to 0° (0 phase) to become S-polarized light, and then adjusted to 90° (π phase) to become P-polarized light.

[0074] Specifically, the display light emitted by the display passes through polarization modulator 11 and quartz crystal 12 for light adjustment, and finally converges through Fresnel lens 13 to enter the human eye. P-polarized light, after passing through quartz crystal 12, propagates as o-ray; S-polarized light, after passing through quartz crystal 12, propagates as e-ray. Consequently, the pixel projection images of o-ray and e-ray shift after passing through quartz crystal 12, corresponding to the change in sampling position. Therefore, the display light of the first display image can be controlled to be modulated by the first target polarization angle of the polarization modulator 11 and become P polarized light, and the display light of the second display image can be modulated by the second target polarization angle of the polarization modulator 11 and become S polarized light; or, the display light of the first display image can be modulated by the first target polarization angle of the polarization modulator 11 and become S polarized light, and the display light of the second display image can be modulated by the second target polarization angle of the polarization modulator 11 and become P polarized light; the P polarized light and the S polarized light are refracted at different refraction angles by the quartz crystal 12, and are offset corresponding to the change in the sampling position, and finally converged at the Fresnel lens 13 to enter the human eye.

[0075] Then, the thickness d of the quartz crystal 12 should be:

[0076] Where L is the width of a pixel on the display, and Φ is the dispersion angle of the e-light. The solution is:

[0077] Where θ is the angle between the incident light and the optical axis, n o is the refractive index of o light, n e is the refractive index of e-light.

[0078] For example, referring to Figure 3, the display is an LCD display emitting P-polarized light. Assume that multiple consecutive frames are divided into even and odd frames based on the frame number, counting from frame 0 (the even frame). The sampling positions of consecutive odd and even frames are shifted by half a pixel in the diagonal direction of the pixels.

[0079] At frame 0 (t=0), rasterization and sampling rendering are performed at the first sampling position to generate a first display image. Using the polarization modulator 11, the P-polarized light of the first display image entering the polarization modulator 11 is modulated to a first target polarization angle of 0° (0 phase) to obtain P-polarized light. After passing through the quartz crystal 12, the P-polarized light propagates as o-ray and is emitted along the original path.

[0080] At the first frame (t=1), rasterization and sampling rendering are performed at the second sampling position to generate the second display image. Using the polarization modulator 11, the P-polarized light of the second display image entering the polarization modulator 11 is modulated at a second target polarization angle of 90° (π phase) to generate S-polarized light. After passing through the quartz crystal 12, the S-polarized light propagates as e-light, and the e-light of the first frame is offset by half a pixel relative to the o-light of the zero frame.

[0081] Finally, the adjusted display light passes through the Fresnel lens 13 and converges to form an image at the human eye.

[0082] Optionally, the optical path adjustment component includes a folded optical path component 14 .

[0083] Optionally, the folded optical path assembly 14 includes a beam splitter 141, a third phase delay plate 142 and a reflective polarizing film 143, the beam splitter 141 is configured to transmit a first preset proportion of light and reflect a second preset proportion of light, the sum of the first preset proportion and the second preset proportion is 1, the third phase delay plate 142 is configured to switch one of linearly polarized light and circularly polarized light to the other, and the reflective polarizing film 143 is configured to transmit linearly polarized light of a first preset polarization angle and reflect linearly polarized light of a second preset polarization angle.

[0084] The first preset ratio is 50%, and the second preset ratio is 50%. The beam splitter 141 is configured to transmit 50% of right-circularly polarized light (RCP) and reflect 50% of left-circularly polarized light (LCP). The reflective polarizing film 143 is configured to transmit S-polarized light and reflect P-polarized light.

[0085] Specifically, the folded optical path component 14 transmits a first preset proportion of light and reflects a second preset proportion of light through the beam splitter 141, the third phase delay plate 142 switches linearly polarized light and circularly polarized light, and the reflective polarizing film 143 transmits linearly polarized light of a first preset polarization angle and reflects linearly polarized light of a second preset polarization angle, thereby changing the propagation direction and path of the light and folding the optical path of the display light.

[0086] Please refer to Figure 4. In some embodiments, the polarization modulator 11 includes a first polarization modulator 111 and a second polarization modulator 112. The refraction device 12 is located between the first polarization modulator 111 and the second polarization modulator 112. The first polarization modulator 111, the refraction device 12, the second polarization modulator 112 and the folded optical path component 14 are arranged in sequence along the outgoing direction of the display light of the displayed image.

[0087] The optical module 10 also includes a first phase delay plate 15 located between the second polarization modulator 112 and the folded optical path component 14. The first phase delay plate 15 is configured to adjust the linearly polarized light entering the folded optical path component 14 into circularly polarized light. The phase adjustment amounts of the first polarization modulator 111 and the second polarization modulator 112 are both π, so that the polarization angles of the light entering the first phase delay plate are consistent.

[0088] Specifically, the optical module 10 includes a first polarization modulator 111, a quartz crystal 12, a second polarization modulator 112, a first phase retarder 15, and a folded optical path component 14, which are sequentially arranged along the exit direction of the display light of the display image. The folded optical path component 14 includes a beam splitter 141, a third phase retarder 142, and a reflective polarizing film 143, which are sequentially arranged along the exit direction of the display light. In other words, the optical module 10 includes a first polarization modulator 111, a quartz crystal 12, a second polarization modulator 112, a first phase retarder 15, a beam splitter 141, a third phase retarder 142, and a reflective polarizing film 143, which are sequentially arranged along the exit direction of the display light of the display image. The display light of the display image can be modulated into P-polarized light or S-polarized light by adjusting the different target polarization angles corresponding to different sampling positions by the first polarization modulator 111. After passing through the quartz crystal 12 , the P polarized light propagates as o light, and after passing through the quartz crystal 12 , the S polarized light propagates as e light. Thus, the pixel projection images of the o light and the e light will be offset according to the change in the sampling position.

[0089] After leaving the quartz crystal 12, the o-light and the e-light enter the second polarization modulator 112. Since the phase adjustment amounts of the first polarization modulator 111 and the second polarization modulator 112 are both π, the polarization angles of the light entering the first phase retarder 15 are consistent, that is, after the adjustment of the different target polarization angles corresponding to different sampling positions of the first polarization modulator 112, the o-light and the e-light are both modulated into P-polarized light. After passing through the first phase retarder 15, the P-polarized light changes its polarization form and becomes right-handed polarized light RCP. After passing through the beam splitter 141, the right-handed polarized light RCP does not change its polarization form and remains right-handed polarized light RCP, but at this time the light energy will be lost by 100%. Fifty percent of the time, the right-handed polarized light RCP will become P-polarized light after passing through the third phase retarder 142. The P-polarized light reaches the reflective polarizing film 143 and is reflected. The reflection does not change the shape of the light, and the reflected light is still P-polarized light. The P-polarized light passes through the third phase retarder 142 again and turns back into the right-handed polarized light RCP. The right-handed polarized light RCP is reflected by the beam splitter 141 and becomes the left-handed polarized light LCP. The left-handed polarized light LCP passes through the third phase retarder 142 and becomes S-polarized light. The S-polarized light reaches the reflective polarizing film 143, transmits into the human eye, and forms an image in the human eye.

[0090] That is to say, the display light of the first display image can be controlled to be modulated by the first target polarization angle of the first polarization modulator 111 and become P polarized light, and the display light of the second display image can be modulated by the second target polarization angle of the first polarization modulator 111 and become S polarized light; or, the display light of the first display image can be controlled to be modulated by the first target polarization angle of the first polarization modulator 111 and become S polarized light, and the display light of the second display image can be modulated by the second target polarization angle of the first polarization modulator 111 and become P polarized light, and the P polarized light and the S polarized light are refracted at different refraction angles by the quartz crystal 12, and an offset corresponding to the change in the sampling position occurs, and after the π phase of the first polarization modulator 112 is adjusted, the display light of the first display image and the display light of the second display image are both modulated into P polarized light for subsequent optical path folding.

[0091] For example, referring to Figure 4, the display is an LCD display emitting P-polarized light. Assume that multiple consecutive frames are divided into even and odd frames based on the frame number, counting from frame 0 (the even frame). The sampling positions of consecutive odd and even frames are shifted by half a pixel in the diagonal direction of the pixels.

[0092] At frame 0 (t=0), rasterization and sampling rendering are performed at the first sampling position to generate a first display image. The first polarization modulator 111 is used to modulate the P polarized light of the first display image entering the first polarization modulator 111 by 0° (0 phase) to obtain P polarized light. After passing through the quartz crystal 12, the light is propagated as o-light.

[0093] At frame 1 (t=1), rasterization and sampling rendering are performed at the second sampling position to generate a second display image. Using the first polarization modulator 111, the P-polarized light of the second display image entering the first polarization modulator 111 is modulated by 90° (π phase) to obtain S-polarized light. After passing through the quartz crystal 12, it is emitted and propagated as e-light that is offset by half a pixel relative to frame 0.

[0094] After leaving the quartz crystal 12, the o light obtained from the even frames and the e light obtained from the odd frames enter the second polarization modulator 112. The second polarization modulator 112 adjusts the target polarization angle (0 phase) of the even frames to 0° and adjusts the target polarization angle (π phase) of the odd frames to 90°. Therefore, the display light of the even frames and the odd frames obtains P polarized light after passing through the second polarization modulator 112. After passing through the first phase retarder 15, the P-polarized light becomes right-handed polarized light RCP. After passing through the beam splitter 141, the right-handed polarized light RCP remains right-handed polarized light RCP. The right-handed polarized light RCP continues to be emitted. After passing through the third phase retarder 142, it becomes P-polarized light. The P-polarized light reaches the reflective polarizing film 143 and is reflected. The reflected light is still P-polarized light. The P-polarized light continues to be emitted. After passing through the third phase retarder 142, it turns back into right-handed polarized light RCP. The right-handed polarized light RCP is reflected by the beam splitter 141 and becomes left-handed polarized light LCP. The left-hand polarized light LCP passes through the third phase retarder 142 and becomes S-polarized light. The S-polarized light reaches the reflective polarizing film 143, transmits into the human eye, and forms an image in the human eye.

[0095] It should be noted that the transmittance of the polarization modulator is about 45%, and the display light will attenuate 50% of the light energy each time it passes through the beam splitter 141. In the embodiment of the present application, the display light of the display image passes through the polarization modulator twice and the beam splitter 141 twice. Therefore, it can be seen that without considering the absorption of light energy by other optical components, the final optical utilization rate of the display light is 1*45%*45%*50%*50%=5%. That is to say, in actual applications, the final optical utilization rate will be less than 5%.

[0096] Referring to FIG. 5 , in some embodiments, the folded optical path component, the polarization modulator, and the refraction device 12 are sequentially arranged along the emission direction of the display light for displaying an image.

[0097] The optical module 10 further includes a second phase retarder 16, a folded optical path component 14, a polarization modulator 11 and a refraction device 12 arranged in sequence along the exit direction. The second phase retarder 16 is configured to adjust the linearly polarized light entering the folded optical path component into circularly polarized light.

[0098] The refraction device 12 includes a birefringent crystal 12, the thickness of which is determined according to a preset magnification of the virtual image relative to the display, a pixel size of the display, a preset distance from the birefringent crystal to the human eye, a preset distance from the human eye to the virtual image, and a preset dispersion angle.

[0099] The pixel size of the display includes the pixel width of the display, and the dispersion angle refers to the deflection angle caused by the dispersion effect when the incident light enters the refraction device 12 .

[0100] Specifically, the optical module 10 includes a second phase retarder 16, a beam splitter 141, a third phase retarder 142, a reflective polarizing film 143, a polarization modulator 11, and a quartz crystal 12, which are sequentially arranged along the emission direction of the display light of the display image. The display light of the display image at different sampling positions is converted into circularly polarized light after passing through the second phase retarder 16. The circularly polarized light is modulated by the optical module 10 to obtain linearly polarized light. The linearly polarized light is modulated by the polarization modulator 11 to obtain display light of different polarization states after being modulated at different target polarization angles corresponding to different sampling positions. After entering the quartz crystal 12, the display light of different polarization states is refracted at the refraction angle corresponding to the different sampling positions, ultimately obtaining display light of relatively offset sampling positions.

[0101] For example, referring to Figure 5, the display is an LCD display emitting P-polarized light. Assume that multiple consecutive frames are divided into even and odd frames based on the frame number, counting from frame 0 (the even frame). The sampling positions of consecutive odd and even frames are shifted by half a pixel in the diagonal direction of the pixels.

[0102] In an even-numbered frame, rasterization and sampling rendering are performed on the first sampling position to generate a first display image. The display light (P polarized light) of the first display image is emitted, and is converted into right-handed polarized light RCP by the second phase retarder 16. The right-handed polarized light RCP enters the beam splitter 141 without changing its polarization state, but loses 50% of its light energy. The right-handed polarized light RCP continues to be emitted, and is converted into P polarized light after passing through the third phase retarder 142. After the P polarized light reaches the reflective polarizing film 143, it is reflected to obtain P polarized light. The P polarized light continues to be emitted, and is converted back into right-handed polarized light RCP by passing through the third phase retarder 142. The right-handed polarized light RCP is reflected on the beam splitter 141 to obtain left-handed polarized light LCP. The left-handed polarized light LCP is converted into S polarized light by passing through the third phase retarder 142. The S polarized light is transmitted through the reflective polarizing film 143 and enters the polarization modulator 11 as S polarized light. After being modulated by the first target polarization angle of 90°, it is converted into P polarized light. After passing through the quartz crystal 12, the P polarized light propagates in the manner of o light.

[0103] In odd frames, rasterization and sampling rendering of the second sampling position are performed to generate a second display image. The display light (P polarized light) of the second display image is emitted, and is converted into right-handed polarized light RCP after passing through the second phase retarder 16. The right-handed polarized light RCP enters the beam splitter 141 without changing the polarization state and remains right-handed polarized light RCP, but loses 50% of the light energy. The right-handed polarized light RCP continues to be emitted, and is converted into P polarized light after passing through the third phase retarder 142. After the P polarized light reaches the reflective polarizing film 143, it is reflected to obtain P polarized light. The P polarized light continues to be emitted, and is converted back to right-handed polarized light after passing through the third phase retarder 142. RCP, the right-handed polarized light RCP is reflected on the beam splitter 141 to obtain the left-handed polarized light LCP, which is converted into S-polarized light through the third phase retarder 142. The S-polarized light is transmitted through the reflective polarizing film 143 and enters the polarization modulator 11 as S-polarized light. After being modulated by the second target polarization angle of 0°, the S-polarized light is converted into S-polarized light. After passing through the quartz crystal 12, the S-polarized light is transmitted and emitted at a position offset by half a pixel in the manner of e-light. In this way, the o-light and the e-light emitted at a position offset by half a pixel relative to the o-light converge and form an image in the human eye.

[0104] Referring to FIG. 6 , in the embodiment of the present application, since the optical module 10 scales the pixels of the display, the required thickness of the birefringent crystal 12 needs to be recalculated. The thickness of the birefringent crystal 12 is determined based on the preset magnification of the virtual image relative to the display, the pixel width of the display, the preset distance from the birefringent crystal 12 to the human eye, the preset distance from the human eye to the virtual image, and the preset dispersion angle. Assuming that in a VR device, the preset magnification of the virtual image and the display is A, the width of a pixel on the display is L, the preset distance from the quartz crystal 12 to the human eye is x, the preset distance from the human eye to the virtual image is M, and the preset dispersion angle is , the size f of the pixel of the display after scaling on the quartz crystal 12 can be calculated as:

[0105] It can be seen that the original required thickness d of the birefringent crystal 12 is:

[0106] Therefore, it can be calculated that the required thickness d' of the birefringent crystal 12 in the embodiment of the present application is:

[0107] It can be understood that in the embodiment of the present application, compared with the previous embodiment of the application, the use of a polarization modulator is reduced, and the optical utilization rate of the display light will be higher. However, since the optical module 10 scales the pixels of the display, the thickness of the birefringent crystal needs to be recalculated based on the parameters. Different products have different parameters, so the thickness of the birefringent crystal needs to be calculated separately for different products.

[0108] Please refer to Figure 7. In an embodiment of the present application, the polarization modulator 11, the refraction device 12 and the folded optical path component 14 are arranged in sequence along the exit direction of the display light of the displayed image. The optical module 10 also includes a fourth phase delay plate 17 located between the refraction device 12 and the folded optical path component 14. The fourth phase delay plate 14 is configured to adjust the linearly polarized light entering the folded optical path component 14 to circularly polarized light, and generate a first preset phase delay.

[0109] Optionally, the polarization modulator 11 includes a third polarization modulator 113 and a fourth polarization modulator 114, the folded optical path assembly 14 includes a beam splitter 141, a fourth polarization modulation device 114 and a reflective polarization film 143, the third polarization modulator 113, the refraction device 12, the fourth phase delay plate 17, the beam splitter 141, the fourth polarization modulator 114 and the reflective polarization film 143 are arranged in sequence along the exit direction; the beam splitter 141 is configured to transmit a first preset proportion of light and reflect a second preset proportion of light, the sum of the first preset proportion and the second preset proportion is 1, the reflective polarization film 143 is configured to transmit linearly polarized light of a first preset polarization angle and reflect linearly polarized light of a second preset polarization angle; the third polarization modulator 113, the fourth phase delay plate 17 and the fourth polarization modulator 114 cooperate to adjust the circularly polarized light passing through the folded optical path assembly to linearly polarized light of a first preset polarization angle.

[0110] Optionally, the sampling position includes a first sampling position and a second sampling position, and the displayed image includes a first display image corresponding to the first sampling position and a second display image corresponding to the second sampling position; the first preset phase delay is π / 2, and when the first display image is displayed, the phase delay of the third polarization modulator 113 is 0, and the phase delay of the fourth polarization modulator 114 is π / 2; when the second display image is displayed, the phase delay of the third polarization modulator 113 is π, and the phase delay of the fourth polarization modulator 114 is -π / 2.

[0111] The beam splitter 141 is configured to transmit 50% of the light and reflect 50% of the light, and the reflective polarizing film 143 is configured to transmit S-polarized light and reflect P-polarized light.

[0112] Specifically, the optical module 10 includes a third polarization modulator 113, a quartz crystal 12, a fourth phase delay plate 17, a beam splitter 141, a fourth polarization modulation device and a reflective polarizing film 143, which are arranged in sequence along the emission direction of the display light of the display image. The first display image is sampled and rendered at the first sampling position. After the display light of the first display image passes through the third polarization modulator 113 with a phase delay of 0, it is still emitted as polarized light in the current phase polarization state. After passing through the quartz crystal 12, it enters the fourth phase delay plate 17 in the form of o light and becomes right-handed polarized light RCP. At this time, the phase is reduced by π / 2. After the right-handed polarized light RCP passes through the beam splitter 141, the polarization state is not changed, and 50% of the right-handed polarized light RCP is transmitted through the fourth polarization modulator 114 with a phase delay of π / 2, that is, the phase is increased at this time. π / 2, P-polarized light is obtained. After being reflected on the reflective polarizing film 143, the P-polarized light is still P-polarized light. The P-polarized light continues to be emitted and passes through the fourth polarization modulator 114 with a phase delay of π / 2 again (i.e., the phase is increased by π / 2 at this time) to be converted back to right-handed polarized light RCP. When the right-handed polarized light RCP passes through the beam splitter 141, 50% of the left-handed polarized light LCP is reflected. The left-handed polarized light LCP passes through the fourth polarization modulator 114 (i.e., the phase is increased by π / 2 at this time) to be S-polarized light. The S-polarized light reaches the reflective polarizing film 143 and is emitted.

[0113] The second display image is obtained by sampling and rendering at the second sampling position. After the display light of the second display image passes through the third polarization modulator 113 with a phase delay of π, it is emitted as polarized light with a polarization state of +π phase with the display light of the second display image. After passing through the quartz crystal 12, it enters the fourth phase delay plate 17 in the form of e-light and becomes left-handed polarized light LCP. At this time, the phase is reduced by π / 2. After the left-handed polarized light LCP passes through the beam splitter 141, the polarization state is not changed, and 50% of the left-handed polarized light LCP is transmitted through the fourth polarization modulator 114 with a phase delay of -π / 2, that is, the phase is reduced by π / 2 at this time, and P polarized light is obtained. The P polarized light is reflected on the reflective polarizing film 14. 3, P-polarized light is still obtained. The P-polarized light continues to be emitted and passes through the fourth polarization modulator 114 with a phase delay of -π / 2 again (that is, the phase is reduced by π / 2 at this time) to be converted back to left-handed polarized light LCP. When the left-handed polarized light LCP passes through the beam splitter 141, 50% of the right-handed polarized light RCP is reflected. The right-handed polarized light RCP passes through the fourth polarization modulator 114 (that is, the phase is reduced by π / 2 at this time) to obtain S-polarized light. The S-polarized light reaches the reflective polarizing film 143 and is transmitted through it. In this way, the display light of the first display image and the display light of the second display image are respectively modulated, emitted at a distance that varies with the offset relative to the first sampling position, and are imaged by the human eye.

[0114] For example, referring to Figure 7, the display is an LCD display emitting P-polarized light. Assume that multiple consecutive frames are divided into even and odd frames based on the frame number, counting from frame 0 (the even frame). The sampling positions of consecutive odd and even frames are shifted by half a pixel in the diagonal direction of the pixels.

[0115] At the 0th frame (t=0), rasterization and sampling rendering of the first sampling position are performed to generate the first display image. The display light (P polarized light) of the first display image is emitted. After being modulated by the first target polarization angle (0°) of the third polarization modulator 113, the P polarized light is emitted with a polarization state of phase 0. After passing through the quartz crystal 12, it enters the fourth phase retarder 17 in the form of o light and becomes right-handed polarized light RCP. At this time, the phase is 0-π / 2=-π / 2. The display light continues to be emitted. After passing through the beam splitter 141 and the fourth polarization modulator 114 with a phase delay of π / 2, the phase is -π / 2+π / 2=0, and P polarized light is obtained. After being reflected by the reflective polarizing film 143, the P-polarized light is still P-polarized light. The P-polarized light continues to be emitted and passes through the fourth polarization modulator 114 with a phase delay of π / 2 again, becoming right-handed polarized light RCP. At this time, the phase is 0+π / 2=π / 2. The right-handed polarized light RCP passes through the beam splitter 141 to become left-handed polarized light LCP. The left-handed polarized light LCP passes through the fourth polarization modulator 114 with a phase delay of π / 2, and the phase is π / 2+π / 2=π, becoming S-polarized light. The S-polarized light reaches the reflective polarizing film 143 and is transmitted.

[0116] At the first frame (t=1), rasterization and sampling rendering of the second sampling position are performed to generate the second display image. The display light (P polarized light) of the second display image is emitted. After the P polarized light is modulated by the second target polarization angle (90°) of the third polarization modulator 113, it is emitted with a polarization state of phase π. After passing through the quartz crystal 12, it is emitted in the form of e-light with a half-pixel offset and propagates into the fourth phase delay plate 17, becoming left-handed polarized light LCP. At this time, the phase is π-π / 2=π / 2. The display light continues to be emitted. After passing through the beam splitter 141 and the fourth polarization modulator 114 with a phase delay of -π / 2, the phase is π / 2-π / 2=0, and P polarized light is obtained. After the polarized light is reflected on the reflective polarizing film 143, P-polarized light is still obtained. The P-polarized light continues to be emitted and passes through the fourth polarization modulator 114 with a phase delay of -π / 2 again, and is converted back into left-handed polarized light LCP. At this time, the phase is 0-π / 2=-π / 2. The left-handed polarized light LCP passes through the beam splitter 141 to obtain right-handed polarized light RCP. The right-handed polarized light RCP passes through the fourth polarization modulator 114 with a phase delay of -π / 2, and the phase is -π / 2-π / 2=-π, obtaining S-polarized light. The S-polarized light reaches the reflective polarizing film 143 and is transmitted, and finally forms an image in the human eye.

[0117] In this way, compared with the second embodiment of the present application, the light energy loss is reduced, compared with the third embodiment of the present application, the influence of image scaling is avoided, and optical path splitting is achieved while improving the resolution.

[0118] Referring to FIG. 1 , a display device 100 according to an embodiment of the present application includes an optical module 10 , a display 20 , and a memory 40 .

[0119] Optionally, it also includes: a processor 30, a sampling rendering module 50 and a display control module 60, the sampling rendering module 50 is configured to generate a display image; the display control module 60 is configured to send a control signal to the polarization modulator to control the polarization modulator to adjust the polarization angle of the display light to the target polarization angle; the processor 30 includes a main processor 31 and a graphics processor (Graphics Processing Unit, GPU) 32, the main processor 31 is used to send the current frame signal to the sampling rendering module and the display control module respectively to synchronize the sampling rendering module 50 and the display control module 60. When the sampling rendering module 50 and the display control module 60 are synchronized, the target polarization angle corresponds to the sampling position of the current frame display image.

[0120] Please refer to FIG8 . In the case where the current scene is sampled and rendered by the GPU graphics processor 32 to generate a scene image and the display 20 is controlled by the FPGA, the main processor 31 synchronously sends a frame signal to the GPU graphics processor 32 and the FPGA. In the sampling and rendering module 50 , the GPU graphics processor 32 performs vertex processing and rasterization according to the application scene, and performs pixel shading processing and Framebuffer resampling processing according to the frame signal to generate a display image. At the same time, after receiving the frame signal, the FPGA sends a gate circuit signal to control the signal generator, and the signal generator sends a control signal according to the received signal. The voltage changes the state of the polarization modulator, and the GPU graphics processor 32 sends the generated display image to the display 20 for display. The display light emitted by the display 20 is modulated into 0° or 90° linear polarized light through the polarization modulator. The 0° or 90° linear polarized light passing through the polarization modulator is emitted as o light or e light through the birefringent crystal. The o light or e light emitted through the birefringent crystal passes through the optical module 10 and is superimposed on the human eye to form an image. The GPU's pixel shading processing and Framebuffer resampling processing are continuously switched according to the frame signal, and the state of the polarization modulator is synchronously selected to improve the resolution.

[0121] In the description of this specification, the reference terms "certain embodiments", "in an example", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0122] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0123] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An optical module, characterized in that: The optical module is configured to adjust the display light of the display image so that the display position of the display image corresponds to the sampling position when the display image is rasterized, and the optical module includes: a polarization modulator configured to adjust the polarization angle of the display light to a target polarization angle, wherein the sampling positions of the display images of consecutive frames are different, and the target polarization angle corresponds to the sampling position of the display image of a current frame; a refraction device configured to refract the display light, wherein the target polarization angle corresponds to the refraction angle; The optical path adjustment component is configured to converge the display light so that the emitted light is directed to a preset area.

2. The optical module according to claim 1, characterized in that: The polarization modulator, the refraction device and the optical path adjustment component are arranged in sequence along the emission direction of the display light of the display image.

3. The optical module according to claim 1 or 2, characterized in that: The optical path adjustment component includes a Fresnel lens.

4. The optical module according to claim 1, characterized in that: The optical path adjustment component includes a folded optical path component.

5. The optical module according to claim 4, characterized in that: The polarization modulator includes a first polarization modulator and a second polarization modulator, the refraction device is located between the first polarization modulator and the second polarization modulator, and the first polarization modulator, the refraction device, the second polarization modulator and the folded optical path component are arranged in sequence along the emission direction of the display light of the display image.

6. The optical module according to claim 5, characterized in that: The optical module also includes a first phase delay plate located between the second polarization modulator and the folded optical path component, the first phase delay plate is configured to adjust the linear polarized light entering the folded optical path component to circularly polarized light, and the phase adjustment amounts of the first polarization modulator and the second polarization modulator are both π, so that the polarization angles of the light entering the first phase delay plate are consistent.

7. The optical module according to claim 4, characterized in that: The folded optical path component, the polarization modulator and the refraction device are arranged in sequence along the emission direction of the display light of the display image.

8. The optical module according to claim 7, characterized in that: The optical module also includes a second phase delay plate, and the second phase delay plate, the folded optical path component, the polarization modulator and the refraction device are arranged in sequence along the output direction, and the second phase delay plate is configured to adjust the linearly polarized light entering the folded optical path component into circularly polarized light.

9. The optical module according to claim 8, characterized in that: The refraction device includes a birefringent crystal, the thickness of which is determined according to a preset magnification of the virtual image relative to the display screen, a pixel size of the display, a preset distance from the birefringent crystal to the human eye, a preset distance from the human eye to the virtual image, and a preset dispersion angle.

10. The optical module according to claim 4, characterized in that: The folded optical path component includes a beam splitter, a third phase delay plate and a reflective polarizing film. The beam splitter is configured to transmit a first preset ratio of light and reflect a second preset ratio of light, the sum of the first preset ratio and the second preset ratio is 1. The third phase delay plate is configured to switch one of linear polarized light and circular polarized light to the other. The reflective polarizing film is configured to transmit linear polarized light of a first preset polarization angle and reflect linear polarized light of a second preset polarization angle.

11. The optical module according to claim 4, characterized in that: The polarization modulator, the refraction device and the folded optical path component are arranged in sequence along the exit direction of the display light of the display image, and the optical module also includes a fourth phase delay plate located between the refraction device and the folded optical path component, and the fourth phase delay plate is configured to adjust the linear polarized light entering the folded optical path component to circularly polarized light and generate a first preset phase delay.

12. The optical module according to claim 11, characterized in that: The polarization modulator includes a third polarization modulator and a fourth polarization modulator, the folded optical path component includes a beam splitter, the fourth polarization modulation device and a reflective polarization film, and the third polarization modulator, the refraction device, the fourth phase delay plate, the beam splitter, the fourth polarization modulation device and the reflective polarization film are arranged in sequence along the exit direction; The beam splitter is configured to transmit a first preset ratio of light and reflect a second preset ratio of light, the sum of the first preset ratio and the second preset ratio being 1, and the reflective polarizing film is configured to transmit linearly polarized light of a first preset polarization angle and reflect linearly polarized light of a second preset polarization angle; The third polarization modulator, the fourth phase delay plate and the fourth polarization modulator cooperate to adjust the circularly polarized light passing through the folded optical path component to linearly polarized light of the first preset polarization angle.

13. The optical module according to claim 12, characterized in that: The sampling positions include a first sampling position and a second sampling position, and the display image includes a first display image corresponding to the first sampling position and a second display image corresponding to the second sampling position; The first preset phase delay is π / 2. When the first display image is displayed, the phase delay of the third polarization modulator is 0, and the phase delay of the fourth polarization modulator is π / 2. When the second display image is displayed, the phase delay of the third polarization modulator is π, and the phase delay of the fourth polarization modulator is -π / 2.

14. The optical module according to claim 1, characterized in that: The sampling positions include a first sampling position and a second sampling position, and the polarization modulator is configured to adjust the polarization angle of the display light to a first target polarization angle and a second target polarization angle, wherein the first target polarization angle corresponds to the first sampling position, and the second target polarization angle corresponds to the second sampling position; The refraction device includes a birefringent crystal, and the display light of the first target polarization angle has a first refraction angle of the birefringent crystal and the display light of the second target polarization angle has a second refraction angle of the birefringent crystal that is different, so that the display positions corresponding to the first sampling position and the second sampling position are different.

15. A display device, characterized in that: include: a display configured to display the display image; and The optical module according to any one of claims 1 to 14.

16. The display device according to claim 15, characterized in that Also includes: A sampling and rendering module, configured to generate the display image; A display control module, configured to control the polarization modulator to adjust the polarization angle of the display light to the target polarization angle by sending a control signal to the polarization modulator; A processor is used to send a current frame signal to the sampling rendering module and the display control module respectively to synchronize the sampling rendering module and the display control module. When the sampling rendering module and the display control module are synchronized, the target polarization angle corresponds to the sampling position of the display image of the current frame.

Images