Optical module and display device

Abstract

The application discloses an optical module and a display device. The optical module is configured to adjust display light rays of a display image, so that a display position of the display image corresponds to a sampling position when the display image is rasterized. The optical module comprises: a polarization modulator configured to adjust a polarization angle of the display light rays to a target polarization angle, the sampling positions of continuous multiple frames of the display image being different, the target polarization angle corresponding to the sampling position of a current frame of the display image; a refractive device configured to refract the display light rays, the target polarization angle corresponding to a refractive angle; and a light path adjusting assembly configured to converge the display light rays, so that the display light rays are emitted to a preset region. The display light rays can be emitted at different refractive angles, so that the display positions of different frames of the display image are different, continuous multiple frames of the display image are superimposed within an eye visual persistence time, and the display resolution is improved.

Description

Technical Field

[0001] This application relates to the field of virtual reality technology, and more specifically, to an optical module and a display device. Background Technology

[0002] In the field of VR technology, there is a method to increase the resolution of VR devices by splicing multiple graphics cards and multiple displays to project different sampled images and superimposing them. However, the system structure with multiple graphics cards and multiple displays is complex, requires a lot of physical space, making VR devices too heavy, and has high hardware costs and poor system adjustability. Summary of the Invention

[0003] This application provides an optical module and a display device 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 by the polarization modulator, refraction device and optical path adjustment component of the optical module, so that when displaying multiple consecutive frames, not only can the display resolution be improved, but also the continuity and smooth transition of the displayed image can be guaranteed, thus ensuring the correct visual effect.

[0004] The optical module of this application embodiment is 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 optical module includes: a polarization modulator configured to adjust the polarization angle of the displayed light to a target polarization angle, wherein the sampling positions of multiple consecutive frames of the displayed image are different, and the target polarization angle corresponds to the sampling position of the current frame of the displayed image; a refraction device configured to refract the displayed light, wherein the target polarization angle and the refraction angle correspond; and an optical path adjustment component configured to converge the displayed light so that the emitted light is directed toward a preset area.

[0005] In some embodiments, the polarization modulator, the refractive device, and the optical path adjustment assembly are arranged sequentially along the emission direction of the display light rays of the displayed image.

[0006] In some embodiments, the optical path adjustment assembly includes a Fresnel lens.

[0007] In some embodiments, the optical path adjustment component includes a folded optical path component.

[0008] 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 assembly are arranged sequentially along the emission direction of the display light of the display image.

[0009] In some embodiments, the optical module further includes a first phase delay plate located between the second polarization modulator and the folded optical path assembly. The first phase delay plate is configured to adjust linearly polarized light entering the folded optical path assembly into circularly polarized light. The phase adjustment amount of both the first polarization modulator and the second polarization modulator is π, so that the polarization angle of the light entering the first phase delay plate is consistent.

[0010] In some embodiments, the folded optical path assembly, the polarization modulator, and the refractive device are arranged sequentially along the emission direction of the display light rays of the displayed image.

[0011] In some embodiments, the optical module further includes a second phase retarder, the second phase retarder, the folded optical path assembly, the polarization modulator and the refractive device being arranged sequentially along the emission direction, wherein the second phase retarder is configured to adjust the linearly polarized light entering the folded optical path assembly into circularly polarized light.

[0012] In some embodiments, the refractive device includes a birefringent crystal, the thickness of which is determined based on a preset magnification of the virtual image relative to the display screen, the pixel size of the display screen, 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.

[0013] In some embodiments, the folded optical path assembly includes a beam splitter, a third phase retarder, and a reflective polarizing film. The beam splitter is configured to transmit light at a first preset ratio and reflect light at a second preset ratio, the sum of the first preset ratio and the second preset ratio being 1. The third phase retarder is configured to switch one of linearly polarized light and circularly polarized light to the other. The reflective polarizing film is configured to transmit linearly polarized light at a first preset polarization angle and reflect linearly polarized light at a second preset polarization angle.

[0014] In some embodiments, the polarization modulator, the refractive device, and the folded optical path assembly are arranged sequentially along the emission direction of the display light of the display image. The optical module further includes a fourth phase delay plate located between the refractive device and the folded optical path assembly. The fourth phase delay plate is configured to adjust the linearly polarized light entering the folded optical path assembly into circularly polarized light and generate a first preset phase delay.

[0015] In some embodiments, the polarization modulator includes a third polarization modulator and a fourth polarization modulator, and the folded optical path assembly includes a beam splitter, the fourth polarization modulator, and a reflective polarizing film. The third polarization modulator, the refractive device, the fourth phase retarder, the beam splitter, the fourth polarization modulator, and the reflective polarizing film are arranged sequentially along the emission direction. The beam splitter is configured to transmit light at a first preset ratio and reflect light at a second preset ratio, the sum of the first preset ratio and the second preset ratio being 1. The reflective polarizing film is configured to transmit linearly polarized light at a first preset polarization angle and reflect linearly polarized light at a second preset polarization angle. The third polarization modulator, the fourth phase retarder, and the fourth polarization modulator cooperate to adjust the circularly polarized light passing through the folded optical path assembly into linearly polarized light at the first preset polarization angle.

[0016] In some embodiments, the sampling position includes 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 displaying the first display image, the phase delay of the third polarization modulator is 0, and the phase delay of the fourth polarization modulator is π / 2; when displaying the second display image, the phase delay of the third polarization modulator is π, and the phase delay of the fourth polarization modulator is -π / 2.

[0017] In some embodiments, the sampling positions include a first sampling position and a second sampling position. 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, wherein the display light of the first target polarization angle is refracted at a different first refraction angle in the birefringent crystal and the display light of the second target polarization angle is refracted at a different second refraction angle in the birefringent crystal, so that the display positions corresponding to the first sampling position and the second sampling position are different.

[0018] The display device according to the embodiments of this application includes a display configured to display the displayed image; and an optical module as described in any of the above embodiments.

[0019] The display device according to this application further 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; and a processor configured 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, wherein 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.

[0020] The optical module and display device of this 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 polarized and refracted display light through the optical path adjustment component, so that the outgoing light is directed towards 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 different frames of display images are different, and multiple consecutive frames of display images can be superimposed within the human eye's visual persistence time, thereby improving the display resolution without adding a display screen.

[0021] Compared to increasing the resolution of VR devices by splicing multiple graphics cards and multiple monitors to project and superimpose different sampled images, this application generates multiple consecutive frames of display images by sampling and rendering different sampling positions of the current scene. During display, the optical module 10 adjusts the display light of the display images at different sampling positions in the multiple consecutive frames, so that the display position of the display image also changes in the multiple consecutive frames. By taking advantage of the persistence of vision of the human eye, the superimposed images are superimposed in the human eye, thereby improving the resolution.

[0022] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0024] Figure 1 This is a schematic diagram illustrating the application scenario of a display device according to certain embodiments of this application;

[0025] Figure 2 This is a top sectional view of a display device according to certain embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the structure of an optical module according to certain embodiments of this application;

[0027] Figure 4 This is a schematic diagram of the structure of an optical module according to certain embodiments of this application;

[0028] Figure 5 This is a schematic diagram of the structure of an optical module according to certain embodiments of this application;

[0029] Figure 6 This is a scene diagram of an optical module according to certain embodiments of this application;

[0030] Figure 7 This is a schematic diagram of the structure of an optical module according to certain embodiments of this application;

[0031] Figure 8 This is a scene diagram of an optical module and display device according to certain embodiments of this application. Detailed Implementation

[0032] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote 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 this application, and should not be construed as limiting the embodiments of this application.

[0033] To facilitate understanding of this application, the following explanations are provided for the terms used in this application:

[0034] 1. Virtual Reality (VR) technology, also known as virtual reality or virtual reality technology, encompasses computer science, electronic information, and simulation technology. Its basic implementation relies primarily on computer technology, utilizing and integrating the latest advancements in 3D graphics, multimedia, simulation, display, and server technologies. The graphics processing unit (GPU) within the VR device processes images of the current scene to create a realistic 3D virtual world offering multiple sensory experiences, including visual, tactile, and olfactory sensations, thus providing a sense of immersion for those within the virtual world. The technical solution provided in this application primarily enhances the resolution of VR devices without affecting the frame rate.

[0035] 2. Vertex processing: Each vertex in a 3D graphic has a coordinate system in three-dimensional space. Through linear algebra calculations, the coordinate data of each vertex in three-dimensional space is transformed 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.

[0036] 3. Rasterization: Primitive information generated during vertex processing is input into the rasterization stage. Primitives are first assembled, and then the fragments corresponding to the screen pixels covered by the primitives are determined by triangle traversal. After the rasterization stage, primitives are divided into basic units of pixel size, which are called fragments. Fragments are more like the data representation of pixels. The final pixels are generated from the information in the fragments. Then, the fragment shader colors the fragments. During per-fragment operation, fragments undergo a series of tests. Fragments that pass the tests are converted into pixels and finally presented in the frame buffer area.

[0037] 4. A Field Programmable Gate Array (FPGA) is a programmable logic device. It is a semiconductor chip that consists of a series of programmable logic gates. In the technical solutions provided in this application, it is mainly used to generate gate circuit signals to control the signal generator in order to change the state of the polarization modulator.

[0038] 5. Framebuffer: A video output device drives a video display device from a memory buffer containing complete frame data. In the technical solution provided in this application embodiment, it is mainly used to generate a display image after determining the required resolution as the output frame through framebuffer resampling.

[0039] 6. Fresnel lens: A thin lens made of polyolefin material through injection molding. It has equidistant serrations on one side, which allow it to reflect or refract light within a specified spectral range. In VR devices, Fresnel lenses are used as the main optical module due to their thinness.

[0040] 7. Birefringent crystal: When a beam of light is projected onto a crystal interface, two refracted beams are generally generated. This phenomenon is called birefringence. Due to the anisotropy of the crystal material, the dispersion angle between the two refracted 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 embodiments of this application is quartz crystal.

[0041] To address the aforementioned technical problems, this application provides an optical path module.

[0042] The following section will first introduce one application scenario of the technical solution of this application, such as... Figure 1 As shown, the optical path module provided in this application can be applied to, for example... Figure 1 The application scenario shown involves a display device 100.

[0043] Figure 1 An exemplary display device 100 is shown, but other numbers of display devices 100 may actually be included, and this application embodiment does not limit this.

[0044] 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 images, and the display light emitted from the display 20 passes through the optical module 10 and enters the human eye.

[0045] In one embodiment, the processor 30 may be a graphics processing unit (GPU) 30, which samples and renders the current scene to generate a scene image.

[0046] In one embodiment, the display 20 is used to display the scene image generated after the GPU processor 30 has sampled and rendered it.

[0047] In one embodiment, the display device 100 includes a sampling rendering module 50 and a display control module 60. The sampling rendering module 50 and the display control module 60 can be synchronized through a frame signal so that the polarization angle of the displayed image and the light modulated by the polarization modulator can correspond.

[0048] In the field of VR technology, the method of enhancing resolution based on time-division multiplexing pixel shift overlay has a broad research foundation. The pixel shift overlay method accumulates the pixel position differences of each frame, requires rasterization from different sampling positions, and then performs sampling rendering to obtain a display image of multiple consecutive frames.

[0049] The method to enhance resolution based on time-division multiplexing pixel shift stacking can be as follows:

[0050] For example, the display images generated from different sampling positions across multiple consecutive frames can be divided into even-numbered frames and odd-numbered frames based on frame sequence numbers. Even-numbered frames correspond to the generation of the first display image, and odd-numbered frames correspond to the generation of the second display image. The sampling positions corresponding to the first and second display images have a half-pixel displacement along the diagonal of the pixels. Furthermore, the total display duration of the first and second display images across 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 will be illustrated using this example:

[0051] Sampling rendering typically involves the following steps: Taking a virtual three-dimensional (3D) scene built by the application based on the current scene as an example, the GPU performs a view transformation on the current scene, converting the 3D coordinates of the 3D scene graph into 2D coordinates, and transforming one or more vertices into completely different basic graphics (or primitives), thus generating a much larger number of vertices than before. Primitives are then assembled through rasterization, followed by triangle traversal 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 a series of consecutive frames of display images of the current scene. The generated images are then displayed on the monitor.

[0052] In frame 0, the first display image is obtained by sampling and rendering the original sampling position. Then, in frame 1, the sampling position of the second display image will be determined by the displacement position of half a pixel away from the original sampling position along the pixel diagonal direction. 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. Even-numbered frames will have the same sampling position as frame 0, and odd-numbered frames will have the same sampling position as frame 1.

[0053] When rasterization and colorization are performed on even-numbered frames, the sampling position of the rasterization changes in odd-numbered frames (moving by half a pixel along the diagonal). Therefore, during the rasterization stage, sampling and colorization are performed based on the changed sampling position. Finally, the corresponding resolution is determined as the output frame through framebuffer resampling. For example, assuming the LCD display resolution is n*n, based on the acquired frame signal, rasterization and colorization are performed on even-numbered frames to obtain the first display image, and colorization is performed on odd-numbered frames after changing the rasterization sampling position to obtain the second display image. The n*n resolution display image is then determined and displayed on the monitor through framebuffer resampling.

[0054] It is understandable that, since image formation on the retina requires a certain integration time, inter-frame imaging can be superimposed on the retina during this integration time. Due to the persistence of vision, the human eye perceives the superimposed image formed during this integration time. When the total display time of multiple consecutive frames is less than the preset human eye integration time, the resolution perceived by the human eye exceeds the original screen resolution, thus achieving a resolution improvement effect. Therefore, in this embodiment, the total display time of multiple consecutive frames is less than the preset human eye integration time.

[0055] The first display image in even-numbered frames and the second display image in odd-numbered frames are consecutive display images generated based on different sampling positions during rasterization. Due to the different sampling positions, the pixel positions of even-numbered and odd-numbered frames change. In order to ensure that the movement and deformation of objects in the current scene can be correctly reflected in the rendering results, and to ensure the continuity, smooth transition and correct presentation of the animation, it is necessary to perform corresponding optical path offset (optical path splitting) on ​​the display rays of the first display image or the display rays of the second display image. In this way, when the consecutive display images are superimposed on the human eye based on the persistence of vision, a resolution improvement effect can be achieved.

[0056] Therefore, the optical module 10 of this application embodiment can obtain display images of different sampling positions based on the above-described sampling rendering of rasterized sampling positions, and adjust the display light of the display image.

[0057] The optical module 10 of this application will be described in detail below:

[0058] Please see Figure 3 This application provides an optical module 10 configured to adjust the display light of a displayed image so that the display position of the displayed image corresponds to the sampling position during rasterization of the displayed image.

[0059] The optical module 10 includes a polarization modulator 11, a refraction device 12, and an optical path adjustment component 13. The polarization modulator 11 is configured to adjust the polarization angle of the displayed light to a target polarization angle. The sampling positions of multiple consecutive frames of displayed images are different, and the target polarization angle corresponds to the sampling position of the current frame of displayed image. The refraction device 12 is configured to refract the displayed light, and the target polarization angle corresponds to the refraction angle. The optical path adjustment component 13 is configured to converge the displayed light so that the emitted light is directed towards a preset area.

[0060] Optionally, the sampling positions include a first sampling position and a second sampling position. The polarization modulator 11 is configured to adjust the polarization angle of the displayed 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. The first refraction angle of the displayed light with the first target polarization angle and the second refraction angle of the displayed light with the second target polarization angle are different in the birefringent crystal 12, so that the display positions corresponding to the first sampling position and the second sampling position are different.

[0061] The polarization angle includes a first polarization angle and a second polarization angle, which 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°.

[0062] Specifically, the optical module 10 is configured to adjust the display light of the displayed image so that the display position of the displayed image corresponds to the sampling position during rasterization. The sampling position includes a first sampling position and a second sampling position; that is, the sampling position for each frame is either 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, the first sampling position and the second sampling position are displaced by half a pixel along the diagonal direction of the pixel. The displayed 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 through sampling rendering; rasterization is performed at the second sampling position, and the second display image is generated through sampling rendering.

[0063] 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 sampling and rendering at different sampling positions to generate different display images, the display images are displayed on the monitor 20. The polarization angle of the display light emitted from the display image is adjusted when it passes through the polarization modulator 11. The polarization angle of the display light in the first display image generated after 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 sampling and rendering at the second sampling position is adjusted to the second target polarization angle after passing through the polarization modulator 11.

[0064] The refractive device 12 is configured to refract the display light and includes a birefringent crystal 12, such as a quartz crystal 12. The refraction angles include a first refraction angle and a second refraction angle, which are different. By mapping the refraction angles to the target polarization angles, 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 with the first target polarization angle will have a different refraction angle at the birefringent crystal than the display light with the second target polarization angle. This results in the display light corresponding to the first sampling position exiting at a position different from the display light corresponding to the second sampling position after refraction by the refractive device 12.

[0065] The optical path adjustment component 13 is configured to converge the display light so that the outgoing light is directed toward a preset area. The display light of the first display image generated after the first sampling position is sampled and rendered, and the display light of the second display image generated after the second sampling position is sampled and rendered, are respectively adjusted by the polarization modulator 11 and the refraction device 12. The outgoing light will have a relative position shift. After passing through the optical path adjustment component 13, the light converges and the outgoing light is directed toward the preset area and enters the human eye.

[0066] In other words, the display light rays of the first display image generated by sampling and rendering at the first sampling position correspond to light polarization at the first target polarization angle and light refraction at the first refraction angle; the display light rays of the second display image generated by sampling and rendering at the second sampling position correspond to light polarization at the second target polarization angle and light refraction at the second refraction angle. Therefore, after rasterization and sampling rendering to generate the first display image at the first sampling position for multiple consecutive frames, the polarization angle of the display light rays of the first display image is adjusted to the first target polarization angle after passing through the polarization modulator, and the display light rays of the first display image undergo refraction at the first refraction angle when passing through the refraction device 12; after rasterization and sampling rendering to generate the second display image at the second sampling position, the polarization angle of the display light rays of the second display image is adjusted to the second target polarization angle after passing through the polarization modulator 11, and the display light rays of the second display image undergo refraction at the second refraction angle when passing through the refraction device 12. In this way, the display light rays of the first display image and the display light rays of the second display image in multiple consecutive frames will have a relative offset in sampling position. Finally, they are converged by the optical path adjustment component and directed to a preset area to form an image in the human eye. Thus, the optical path can be split for multiple consecutive frames of display images.

[0067] Thus, by modulating the polarization angle of the display light through the polarization modulator 11 of the optical module 10, adjusting the refraction angle of the display light through the refraction device 12, and converging the polarized and refracted display light through the optical path adjustment component, the outgoing light is directed toward 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, thereby making the display positions of different frames of display images different. This enables the superposition of multiple consecutive frames of display images within the human eye's visual persistence time, achieving an improvement in display resolution without the need to add a display screen.

[0068] Compared to increasing the resolution of VR devices by splicing multiple graphics cards and multiple monitors to project and superimpose different sampled images, this application generates multiple consecutive frames of display images by sampling and rendering different sampling positions of the current scene. During display, the optical module 10 adjusts the display light of the display images at different sampling positions in the multiple consecutive frames, so that the display position of the display image also changes in the multiple consecutive frames. By taking advantage of the persistence of vision of the human eye, the superimposed images are superimposed in the human eye, thereby improving the resolution.

[0069] Please see Figure 3 In some embodiments, the polarization modulator 11, the refractive device 12, and the optical path adjustment assembly 13 are arranged sequentially along the emission direction of the display light of the displayed image.

[0070] The optical path adjustment component 13 includes a Fresnel lens 13.

[0071] The refraction device 12 is a quartz crystal 12. P-polarized light propagates as o-light after passing through the quartz crystal 12, while S-polarized light propagates as e-light after passing through the quartz crystal 12. After entering the polarization modulator 11, P-polarized light is adjusted by 0° (0 phase) to become P-polarized light, and then adjusted by 90° (π phase) to become S-polarized light. After entering the polarization modulator 11, S-polarized light is adjusted by 0° (0 phase) to become S-polarized light, and then adjusted by 90° (π phase) to become P-polarized light.

[0072] Specifically, the display light emitted by the display passes sequentially through a polarization modulator 11 and a quartz crystal 12 for light adjustment, and finally converges through a Fresnel lens 13 to enter the human eye. P-polarized light propagates as o-light after passing through the quartz crystal 12; S-polarized light propagates as e-light after passing through the quartz crystal 12. Therefore, the pixel projection images of o-light and e-light undergo a shift in their corresponding sampling positions after passing through the quartz crystal 12. Therefore, the display light of the first displayed image can be modulated by the first target polarization angle of the polarization modulator 11 to become P-polarized light, and the display light of the second displayed image can be modulated by the second target polarization angle of the polarization modulator 11 to become S-polarized light; or, the display light of the first displayed image can be modulated by the first target polarization angle of the polarization modulator 11 to become S-polarized light, and the display light of the second displayed image can be modulated by the second target polarization angle of the polarization modulator 11 to become P-polarized light; the P-polarized light and S-polarized light are refracted at different angles by the quartz crystal 12, resulting in a shift in the corresponding sampling position, and finally converge at the Fresnel lens 13 into the human eye.

[0073] Therefore, the thickness d of quartz crystal 12 should be:

[0074]

[0075] Where L is the width of one pixel on the display, and Φ is the dispersion angle of the e-ray, which is calculated as follows:

[0076]

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

[0078] For example, please see Figure 3 Taking an LCD display emitting P-polarized light as an example, let's assume that multiple consecutive frames are divided into even-numbered frames and odd-numbered frames based on their frame numbers. Starting from frame 0 (even-numbered frame), the sampling positions of consecutive odd-numbered frames and even-numbered frames have a displacement of half a pixel in the diagonal direction of the pixel.

[0079] At frame 0 (t=0), rasterization and sampling rendering are performed at the first sampling position to generate the first display image. By using polarization modulator 11, the P-polarized light entering the first display image is modulated with 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-light and exits along the original path.

[0080] In the first frame (t=1), rasterization and sampling rendering are performed at the second sampling position to generate the second display image. By using polarization modulator 11, the P-polarized light entering the second display image of polarization modulator 11 is modulated by a second target polarization angle of 90° (π phase) to obtain S-polarized light. After passing through quartz crystal 12, the S-polarized light propagates in the manner of e-light, and the e-light of the first frame is offset by half a pixel relative to the o-light of the 0th frame when it exits.

[0081] Finally, the adjusted display light is converged by Fresnel lens 13 to form an image in the human eye.

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

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

[0084] The first preset ratio is 50%, the second preset ratio is 50%, and the beam splitter 141 is configured to transmit 50% right-circularly polarized light (RCP) and reflect 50% 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 assembly 14 transmits light of a first preset ratio and reflects light of a second preset ratio through the beam splitter 141, the third phase delay film 142 switches between 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 direction and path of light propagation and folding the optical path of the display light.

[0086] Please see Figure 4 In some embodiments, the polarization modulator 11 includes a first polarization modulator 111 and a second polarization modulator 112, and 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 assembly 14 are arranged sequentially along the emission 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 assembly 14. The first phase delay plate 15 is configured to adjust the linearly polarized light entering the folded optical path assembly 14 into circularly polarized light. The phase adjustment amount of the first polarization modulator 111 and the second polarization modulator 112 is π, so that the polarization angle of the light entering the first phase delay plate is 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 retardation film 15, and a folded optical path assembly 14, arranged sequentially along the emission direction of the display light rays of the displayed image. The folded optical path assembly 14 includes a beam splitter 141, a third phase retardation film 142, and a reflective polarizing film 143, arranged sequentially along the emission direction of the display light rays of the displayed image. 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 retardation film 15, a beam splitter 141, a third phase retardation film 142, and a reflective polarizing film 143, arranged sequentially along the emission direction of the display light rays of the displayed image. The display light rays of the displayed image, after being adjusted by the first polarization modulator 111 according to different target polarization angles at different sampling positions, can be modulated into P-polarized light or S-polarized light. After passing through the quartz crystal 12, the P-polarized light propagates as o-light, while the S-polarized light propagates as e-light. As a result, the pixel projection images of o-light and e-light will have corresponding shifts in sampling position.

[0089] After the o-ray and e-ray leave the quartz crystal 12, they enter the second polarization modulator 112. Since the phase adjustment amount of both the first polarization modulator 111 and the second polarization modulator 112 is π, the polarization angle of the light entering the first phase delay plate 15 is consistent. That is, after the o-ray and e-ray are adjusted to different target polarization angles corresponding to different sampling positions in the first polarization modulator 112, they are both modulated into P-polarized light. After passing through the first phase delay plate 15, the P-polarized light changes its polarization shape 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 shape and remains right-handed polarized light RCP, but at this time, the light energy will be lost by 100%. Fifty percent of the light is polarized. After passing through the third phase retardation film 142, the right-handed polarized light RCP becomes P-polarized light. 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 retardation film 142 again and becomes 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-handed polarized light LCP passes through the third phase retardation film 142 and becomes S-polarized light. The S-polarized light reaches the reflective polarizing film 143, is transmitted into the human eye, and forms an image in the human eye.

[0090] In other words, the display light of the first displayed image can be modulated by the first target polarization angle of the first polarization modulator 111 to become P-polarized light, and the display light of the second displayed image can be modulated by the second target polarization angle of the first polarization modulator 111 to become S-polarized light; or, the display light of the first displayed image can be modulated by the first target polarization angle of the first polarization modulator 111 to become S-polarized light, and the display light of the second displayed image can be modulated by the second target polarization angle of the first polarization modulator 111 to become P-polarized light. The P-polarized light and S-polarized light are refracted at different angles by the quartz crystal 12, resulting in a shift in the corresponding sampling position. After the π phase is adjusted by the first polarization modulator 112, the display light of the first displayed image and the display light of the second displayed image are both modulated into P-polarized light for subsequent optical path folding.

[0091] For example, please see Figure 4 Taking an LCD display emitting P-polarized light as an example, let's assume that multiple consecutive frames are divided into even-numbered frames and odd-numbered frames based on their frame numbers. Starting from frame 0 (even-numbered frame), the sampling positions of consecutive odd-numbered frames and even-numbered frames have a displacement of half a pixel in the diagonal direction of the pixel.

[0092] At frame 0 (t=0), rasterization and sampling rendering are performed at the first sampling position to generate the first display image. Using the first polarization modulator 111, the P-polarized light entering the first display image is modulated at 0° (0 phase) to obtain P-polarized light, which then propagates as o-light after passing through the quartz crystal 12.

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

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

[0095] It should be noted that the transmittance of the polarization modulator is about 45%, while the display light is attenuated by 50% each time it passes through the beam splitter 141. In this embodiment, the display light of the image passes through the polarization modulator and the beam splitter 141 twice. Therefore, it can be known that, without considering the absorption of light energy by other optical devices, the final optical utilization rate of the display light is 1*45%*45%*50%*50%=5%. In other words, in practical applications, the final optical utilization rate will be less than 5%.

[0096] Please see Figure 5 In some embodiments, the folded optical path assembly, polarization modulator, and refractive device 12 are arranged sequentially along the emission direction of the display light of the displayed image.

[0097] The optical module 10 also includes a second phase delay plate 16, a folded optical path assembly 14, a polarization modulator 11, and a refraction device 12 arranged sequentially along the emission direction. The second phase delay plate 16 is configured to adjust the linearly polarized light entering the folded optical path assembly into circularly polarized light.

[0098] The refractive device 12 includes a birefringent crystal 12. The thickness of the birefringent crystal 12 is determined based on the preset magnification of the virtual image relative to the display, the pixel size of the display, the preset distance from the birefringent crystal to the human eye, the preset distance from the human eye to the virtual image, and the 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, arranged sequentially along the emission direction of the display light from the displayed image. The display light from the image at different sampling positions becomes circularly polarized light after passing through the second phase retarder 16. The circularly polarized light is modulated by the optical module 10 to become linearly polarized light. The linearly polarized light is modulated by the polarization modulator 11 to obtain display light with different polarization states corresponding to different sampling positions. After entering the quartz crystal 12, the display light with different polarization states is refracted according to the refraction angle corresponding to different sampling positions, finally obtaining display light with a relative offset sampling position.

[0101] For example, please see Figure 5 Taking an LCD display emitting P-polarized light as an example, let's assume that multiple consecutive frames are divided into even-numbered frames and odd-numbered frames based on their frame numbers. Starting from frame 0 (even-numbered frame), the sampling positions of consecutive odd-numbered frames and even-numbered frames have a displacement of half a pixel in the diagonal direction of the pixel.

[0102] In even-numbered frames, rasterization and sampling rendering are performed at the first sampling position to generate the first display image. The first display light (P-polarized light) is emitted and becomes right-handed polarized light RCP after passing through the second phase retardation film 16. The right-handed polarized light RCP enters the beam splitter 141 without changing its polarization state and remains right-handed polarized light RCP, but loses 50% of its light energy. The right-handed polarized light RCP continues to be emitted and becomes P-polarized light after passing through the third phase retardation film 142. The P-polarized light reaches the reflective polarizing film 143 and is reflected to obtain P-polarized light. The P-polarized light continues to be emitted and becomes right-handed polarized light RCP again after passing through the third phase retardation film 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 becomes S-polarized light after passing through the third phase retardation film 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 becomes P-polarized light. After passing through the quartz crystal 12, the P-polarized light propagates in the manner of o-light.

[0103] In odd-numbered frames, rasterization and sampling rendering are performed at the second sampling position to generate the second display image. The display light (P-polarized light) of the second display image is emitted, and after passing through the second phase retardation plate 16, it becomes right-handed polarized light RCP. The right-handed polarized light RCP enters the beam splitter 141 without changing its polarization state and remains right-handed polarized light RCP, but loses 50% of its light energy. The right-handed polarized light RCP continues to be emitted, and after passing through the third phase retardation plate 142, it becomes P-polarized light. After reaching the reflective polarizing film 143, the P-polarized light is reflected, and P-polarized light is obtained. The P-polarized light continues to be emitted, and after passing through the third phase retardation plate 142, it becomes right-handed polarized light again. RCP, the right-handed polarized light, is reflected by the beam splitter 141 to obtain left-handed polarized light LCP. The left-handed polarized light LCP is converted into S-polarized light by the third phase retardation plate 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°, it is converted into S-polarized light. After passing through the quartz crystal 12, the S-polarized light is propagated out at a half-pixel offset in the manner of e-light. In this way, the o-light and the e-light that is offset by half a pixel relative to the o-light converge to form an image in the human eye.

[0104] Please see Figure 6 In this embodiment, 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 the VR device, the preset magnification of the virtual image and the display is A, the width of one 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 Φ, then the size f of the pixel on the quartz crystal 12 after scaling can be calculated as follows:

[0105]

[0106] It can be seen that the original required thickness d of the birefringent crystal 12 is:

[0107]

[0108] Therefore, the required thickness d' of the birefringent crystal 12 in this embodiment can be calculated as follows:

[0109]

[0110] It is understood that, in this embodiment of the application, compared with the previous embodiment, one polarization modulator is reduced, and the optical utilization rate of the displayed 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 according to the parameters. Different products have different parameters, so the thickness of the birefringent crystal needs to be calculated separately for each product.

[0111] Please see Figure 7 In this embodiment, the polarization modulator 11, the refraction device 12 and the folded optical path assembly 14 are arranged sequentially along the emission 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 assembly 14. The fourth phase delay plate 14 is configured to adjust the linearly polarized light entering the folded optical path assembly 14 into circularly polarized light and generate a first preset phase delay.

[0112] Optionally, the polarization modulator 11 includes a third polarization modulator 113 and a fourth polarization modulator 114, and the folded optical path assembly 14 includes a beam splitter 141, a fourth polarization modulator 114, and a reflective polarizing film 143. The third polarization modulator 113, the refractive device 12, the fourth phase retarder 17, the beam splitter 141, the fourth polarization modulator 114, and the reflective polarizing film 143 are arranged sequentially along the emission direction. The beam splitter 141 is configured to transmit light at a first preset ratio and reflect light at a second preset ratio, the sum of the first preset ratio and the second preset ratio being 1. The reflective polarizing film 143 is configured to transmit linearly polarized light at a first preset polarization angle and reflect linearly polarized light at a second preset polarization angle. The third polarization modulator 113, the fourth phase retarder 17, and the fourth polarization modulator 114 cooperate to adjust the circularly polarized light passing through the folded optical path assembly into linearly polarized light at a first preset polarization angle.

[0113] Optionally, the sampling positions include a first sampling position and a second sampling position, and the displayed images include a first displayed image corresponding to the first sampling position and a second displayed image corresponding to the second sampling position; the first preset phase delay is π / 2, and when the first displayed 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 displayed 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.

[0114] Among them, 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.

[0115] Specifically, the optical module 10 includes a third polarization modulator 113, a quartz crystal 12, a fourth phase retardation plate 17, a beam splitter 141, a fourth polarization modulation device, and a reflective polarizing film 143, arranged sequentially along the emission direction of the display light of the displayed image. The first display image is obtained by sampling and rendering at the first sampling position. After passing through the third polarization modulator 113 with a phase delay of 0, the display light of the first display image is emitted with its current phase polarization state. After passing through the quartz crystal 12, it enters the fourth phase retardation plate 17 as o-light, becoming right-handed polarized light RCP. At this time, the phase decreases by π / 2. After passing through the beam splitter 141, the right-handed polarized light RCP does not change its polarization state. 50% of the right-handed polarized light RCP is transmitted through the fourth polarization modulator 114 with a phase delay of π / 2, meaning that the phase increases at this time. π / 2, resulting in P-polarized light. After reflection on the reflective polarizing film 143, the P-polarized light remains P-polarized. The P-polarized light continues to be emitted and passes through the fourth polarization modulator 114 with a phase delay of π / 2 (i.e., the phase increases by π / 2 at this time) to become right-handed polarized light RCP. When the right-handed polarized light RCP passes through the beam splitter 141, it reflects 50% of the left-handed polarized light LCP. The left-handed polarized light LCP passes through the fourth polarization modulator 114 (i.e., the phase increases by π / 2 at this time) to become S-polarized light. The S-polarized light reaches the reflective polarizing film 143 and passes through it.

[0116] The second display image is obtained by sampling and rendering at the second sampling position. The display light of the second display image passes through the third polarization modulator 113 with a phase delay of π and exits 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 retardation plate 17 as e-ray and becomes left-handed polarized light LCP. At this time, the phase is reduced by π / 2. After passing through the beam splitter 141, the polarization state of the left-handed polarized light LCP does not change. 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, resulting in P-polarized light. The P-polarized light is reflected by the polarizing film 14. After reflection at point 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 (i.e., the phase is reduced by π / 2 at this time) and becomes left-handed polarized light LCP. When the left-handed polarized light LCP passes through the beam splitter 141, it reflects 50% of the right-handed polarized light RCP. The right-handed polarized light RCP passes through the fourth polarization modulator 114 (i.e., the phase is reduced by π / 2 at this time) and becomes S-polarized light. The S-polarized light reaches the reflective polarization film 143 and passes through it. In this way, the display light of the first display image and the display light of the second display image are modulated and emitted with a distance that changes relative to the first sampling position and are imaged in the human eye.

[0117] For example, please see Figure 7Taking an LCD display emitting P-polarized light as an example, let's assume that multiple consecutive frames are divided into even-numbered frames and odd-numbered frames based on their frame numbers. Starting from frame 0 (even-numbered frame), the sampling positions of consecutive odd-numbered frames and even-numbered frames have a displacement of half a pixel in the diagonal direction of the pixel.

[0118] At frame 0 (t=0), rasterization and sampling rendering are performed at the first sampling position 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 in a polarization state with a phase of 0. After passing through the quartz crystal 12, it enters the fourth phase retardation plate 17 as o-light, becoming right-handed polarized light RCP. At this point, the phase is 0 - π / 2 = -π / 2. The display light continues to be emitted, and after passing through the beam splitter 141 and the fourth polarization modulator 114 with a phase retardation of π / 2, the phase becomes -π / 2 + π / 2 = 0, resulting in P-polarized light. P-polarized light is reflected by the reflective polarizing film 143 and becomes P-polarized light again. The P-polarized light continues to be emitted and passes through the fourth polarization modulator 114 with a phase delay of π / 2, becoming right-handed polarized light RCP. At this time, the phase is 0 + π / 2 = π / 2. The right-handed polarized light RCP becomes left-handed polarized light LCP after passing through the beam splitter 141. 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.

[0119] In the first frame (t=1), rasterization and sampling rendering are performed at the second sampling position to generate the second display image. The display light (P-polarized light) of the second display image is emitted. After being modulated by the second target polarization angle (90°) of the third polarization modulator 113, the P-polarized light is emitted with a phase of π. After passing through the quartz crystal 12, it is deflected by half a pixel as e-light and propagates into the fourth phase retardation plate 17, becoming left-handed polarized light (LCP). At this point, the phase is π - π / 2 = π / 2. The display light continues to be emitted, and after passing through the beam splitter 141 and the fourth polarization modulator 114 with a phase retardation of -π / 2, the phase becomes π / 2 - π / 2 = 0, resulting in P-polarized light. After the light beam is reflected by the reflective polarizing film 143, it still becomes 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, becoming left-handed polarized light LCP. At this time, the phase is 0 - π / 2 = -π / 2. The left-handed polarized light LCP becomes right-handed polarized light RCP after passing through the beam splitter 141. 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, becoming S-polarized light. The S-polarized light reaches the reflective polarizing film 143 and is transmitted, finally forming an image in the human eye.

[0120] Thus, compared with the second embodiment of this application, light energy loss is reduced, and compared with the third embodiment of this application, the effect of image scaling is avoided. While improving the resolution, optical path splitting is achieved.

[0121] Please see Figure 1 The display device 100 of this application includes an optical module 10, a display 20 and a memory 40.

[0122] 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 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; the processor 30 includes a main processor 31 and a 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.

[0123] Please see Figure 8 While the GPU graphics processor 32 samples and renders the current scene to generate a scene image and the FPGA controls the display 20, the main processor 31 synchronously sends frame signals 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 generates a display image after pixel shading and Framebuffer resampling according to the frame signal. At the same time, after receiving the frame signal, the FPGA sends a gate circuit signal to control the signal generator. The signal generator sends a control voltage to change the state of the polarization modulator according to the received signal. 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° linearly polarized light by the polarization modulator. The 0° or 90° linearly polarized light passed 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 is superimposed on the human eye after passing through the optical module 10. The pixel shading and Framebuffer resampling of the GPU are continuously switched according to the frame signal, and the state of the polarization modulator is selected synchronously, so that the resolution is improved.

[0124] In the description of this specification, the references to terms such as "some embodiments," "in one example," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0125] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0126] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An optical module, characterized in that, The optical module is configured to adjust the display light of the displayed image so that the display position of the displayed image corresponds to the sampling position when the displayed image is rasterized. The optical module includes: A polarization modulator is configured to adjust the polarization angle of the displayed light to a target polarization angle, wherein the sampling positions of the displayed images are different in multiple consecutive frames, and the target polarization angle corresponds to the sampling position of the displayed image in the current frame; A refraction device is configured to refract the displayed light, wherein the target polarization angle corresponds to the refraction angle; The light path adjustment component is configured to converge the display light so that the emitted light rays are directed toward a preset area; The optical path adjustment component includes a folded optical path component, 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 sequentially along the emission direction of the display light of the display image; The optical module further includes a first phase delay plate located between the second polarization modulator and the folded optical path assembly. The first phase delay plate is configured to adjust linearly polarized light entering the folded optical path assembly into circularly polarized light. The phase adjustment amount of both the first polarization modulator and the second polarization modulator is π, so that the polarization angle of the light entering the first phase delay plate is consistent.

2. An optical module, characterized in that, The optical module is configured to adjust the display light of the displayed image so that the display position of the displayed image corresponds to the sampling position when the displayed image is rasterized. The optical module includes: A polarization modulator is configured to adjust the polarization angle of the displayed light to a target polarization angle, wherein the sampling positions of the displayed images are different in multiple consecutive frames, and the target polarization angle corresponds to the sampling position of the displayed image in the current frame; A refraction device is configured to refract the displayed light, wherein the target polarization angle corresponds to the refraction angle; The light path adjustment component is configured to converge the display light so that the emitted light rays are directed toward a preset area; The optical path adjustment component includes a folded optical path component, and the folded optical path component, the polarization modulator, and the refractive device are arranged sequentially along the emission direction of the display light of the display image; The optical module further includes a second phase retarder. The second phase retarder, the folded optical path assembly, the polarization modulator, and the refractive device are arranged sequentially along the emission direction. The second phase retarder is configured to adjust the linearly polarized light entering the folded optical path assembly into circularly polarized light.

3. The optical module according to claim 1 or 2, characterized in that, The polarization modulator, the refractive device, and the optical path adjustment assembly are arranged sequentially along the emission direction of the display light rays of the displayed image.

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

5. The optical module according to claim 2, characterized in that, The refractive device includes a birefringent crystal, the thickness of which is determined based on a preset magnification of the virtual image relative to the display screen, the pixel size of the display screen, 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.

6. The optical module according to claim 1 or 2, characterized in that, The folded optical path assembly includes a beam splitter, a third phase retarder, and a reflective polarizing film. The beam splitter is configured to transmit light at a first preset ratio and reflect light at a second preset ratio, the sum of which is 1. The third phase retarder is configured to switch one of linearly polarized light and circularly polarized light to the other. The reflective polarizing film is configured to transmit linearly polarized light at a first preset polarization angle and reflect linearly polarized light at a second preset polarization angle.

7. The optical module according to claim 1 or 2, characterized in that, The polarization modulator, the refractive device, and the folded optical path assembly are arranged sequentially along the emission direction of the display light of the display image. The optical module also includes a fourth phase delay plate located between the refractive device and the folded optical path assembly. The fourth phase delay plate is configured to adjust the linearly polarized light entering the folded optical path assembly into circularly polarized light and generate a first preset phase delay.

8. The optical module according to claim 7, characterized in that, 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 modulator, and a reflective polarizing film. The third polarization modulator, the refractive device, the fourth phase delay plate, the beam splitter, the fourth polarization modulator, and the reflective polarizing film are arranged sequentially along the emission direction. The beam splitter is configured to transmit light at a first preset ratio and reflect light at a second preset ratio, wherein the sum of the first preset ratio and the second preset ratio is 1; the reflective polarizing film is configured to transmit linearly polarized light at a first preset polarization angle and reflect linearly polarized light at a second preset polarization angle. The third polarization modulator, the fourth phase delay plate, and the fourth polarization modulator work together to adjust the circularly polarized light passing through the folded optical path assembly into linearly polarized light with the first preset polarization angle.

9. The optical module according to claim 8, characterized in that, The sampling position includes 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 displaying the first display image, the phase delay of the third polarization modulator is 0, and the phase delay of the fourth polarization modulator is π / 2. When displaying the second display image, the phase delay of the third polarization modulator is π, and the phase delay of the fourth polarization modulator is -π / 2.

10. The optical module according to claim 1 or 2, characterized in that, The sampling positions include a first sampling position and a second sampling position. The polarization modulator is configured to adjust the polarization angle of the displayed 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, wherein the display light of the first target polarization angle is refracted at a different first refraction angle in the birefringent crystal and the display light of the second target polarization angle is refracted at a different second refraction angle in the birefringent crystal, so that the display positions corresponding to the first sampling position and the second sampling position are different.

11. A display device, characterized in that, include: The display is configured to display the image. and The optical module according to any one of claims 1-10.

12. The display device according to claim 11, characterized in that, Also includes: The sampling and rendering module is configured to generate the displayed image; The display control module is 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 configured 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