Optical module and display device

Abstract

The invention discloses an optical module and a display device, and the optical module is configured to adjust display light of a display image so as to enable the display position of the display image to correspond to the sampling position when the display image is rasterized, and the optical module comprises a polarization modulator which is configured to adjust the polarization angle of the display light to be a target polarization angle, sampling positions of continuous multiple frames of display images are different, and the target polarization angle corresponds to the sampling position of the current frame of display image; the refraction device is configured to refract the display light, and the target polarization angle corresponds to the refraction angle; and the light path adjusting assembly is configured to converge the display light so as to enable the emergent light to be emitted to a preset area. The display light can be emitted at different refraction angles, so that the display positions of different frames of display images are different, the continuous multi-frame display images are superposed in the persistence time of human vision, and the display resolution is improved.

Description

Technical Field

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

[0002] 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 with multiple graphics cards and multiple displays is complex, and it takes up a large physical space, which makes the VR device too heavy. In addition, the hardware cost is high and the system adjustability is poor. Summary of the invention

[0003] An embodiment of the present application provides an optical module and a display device, which are 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. The display light of the display 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 display image can be guaranteed, thereby ensuring the correct visual effect.

[0004] 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, and 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, and the target polarization angle corresponds to the refraction angle; an optical path adjustment component, configured to converge the display light so that the emitted light is directed to a preset area.

[0005] In some embodiments, 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.

[0006] In some embodiments, the optical path adjustment component 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 component are arranged in sequence along the exit direction of the display light of the display image.

[0009] 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, 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 amount 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.

[0010] 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.

[0011] 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.

[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, 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.

[0013] In some embodiments, 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 circularly polarized light to the other, and 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.

[0014] 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 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.

[0015] 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 linear polarized light of a first preset polarization angle and reflect linear 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.

[0016] In some embodiments, 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 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.

[0017] 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 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.

[0018] The display device of the embodiment of the present application includes a display configured to display the display image; and the optical module described in any of the above embodiments.

[0019] 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 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.

[0020] 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, and the display resolution can be improved without increasing the display screen.

[0021] 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, and when displaying, adjusts the display light of multiple frames of display images at different sampling positions through the optical module 10, so that the display position of the display image also changes in multiple frames, thereby superimposing images in the human eye through the visual persistence characteristics of the human eye to achieve an improvement in resolution.

[0022] 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 apparent from the description below, or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 It is a schematic diagram of application scenarios of a display device according to certain embodiments of the present application;

[0025] Figure 2 is a top view of a cross-sectional view of a display device according to some embodiments of the present application;

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

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

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

[0029] Figure 6 is a schematic diagram of a scene of an optical module according to some embodiments of the present application;

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

[0031] Figure 8 It is a scene schematic diagram of an optical module and a display device in certain embodiments of the present application. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and 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 from beginning to end. 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 cannot be understood as limiting the embodiments of the present application.

[0033] To facilitate understanding of this application, the terms appearing in this application are explained below:

[0034] 1. Virtual reality technology (VR), also known as virtual reality or spiritual technology. Virtual reality technology encompasses computers, electronic information, and simulation technology. Its basic implementation method is based on computer technology, utilizing and integrating the latest developments in a variety of high technologies such as three-dimensional graphics technology, multimedia technology, simulation technology, display technology, and servo technology. The graphics processor (GPU) in the VR device processes the image in the current scene to produce a realistic three-dimensional visual, tactile, olfactory and other sensory experiences in the virtual world, so that people in the virtual world have 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.

[0035] 2. Vertex processing: The vertices of 3D graphics have a three-dimensional coordinate. Through linear algebra calculations, the coordinate data of each vertex in the 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.

[0036] 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 pixels are generated by the information in the fragments, and then the fragments are colored by the fragment shader. When operating fragment by fragment, the fragments undergo a series of tests. The tested fragments will be converted into pixels and finally presented in the frame buffer area.

[0037] 4. Field Programmable Gate Array (FPGA) is a programmable logic device, which is a semiconductor chip composed of a series of programmable logic gates. In the technical solution provided in the embodiment of the present application, it is mainly used to send gate circuit signals to control the signal generator 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. The technical solution provided in the embodiment of the present application 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 by injection molding. There are equidistant teeth on one side of the lens. Through these teeth, the light in the specified spectral range can be reflected or refracted. In VR devices, Fresnel lens is used as the main optical module of VR devices due to its thin thickness.

[0040] 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 a quartz crystal.

[0041] In order to solve the above technical problems, an embodiment of the present application provides an optical path module.

[0042] The following first introduces an application scenario of the technical solution of this application. Figure 1 As shown, the optical path module provided by the present application can be applied to Figure 1 In the application scenario shown, the application scenario involves a display device 100 .

[0043] Figure 1 One display device 100 is shown by way of example, but other numbers of display devices 100 may actually be included, and this is not limited in the embodiments of the present application.

[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 a display image, and the display light is emitted from the display 20 and enters the human eye through the optical module 10.

[0045] 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.

[0046] In one embodiment, the display 20 is used to display the scene image generated after sampling and rendering by the GPU processor 30.

[0047] In one embodiment, the display device 100 includes a sampling rendering module 50 and a display control module 60, which can be synchronized by 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, there is already a wide research foundation for enhancing resolution based on time-division multiplexing pixel shifting and superposition. The pixel shifting and superposition method accumulates the pixel position differences of each frame, needs to be rasterized from different sampling positions, and then sampled and rendered to obtain a continuous multi-frame display image.

[0049] The method of enhancing resolution based on time-division multiplexing pixel shifting and superposition can be as follows:

[0050] For example, display images generated by different sampling positions of multiple consecutive frames are divided into even frames and odd frames by frame numbers, the even frames correspond to the generation of a first display image, the odd frames correspond to the generation of a second display image, and the sampling position corresponding to the first display image and the sampling position corresponding to the second display image have a displacement of 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, at this time, counting starts from the 0th frame, and the sampling position of the 0th frame is set as the original sampling position, which is described as an example:

[0051] Among them, sampling rendering generally includes: taking the virtual three-dimensional (3D) scene built by the application based on the current scene as an example, performing 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. Then, primitives are assembled first through rasterization, and then the fragments corresponding to the screen pixels covered by the primitives are determined through triangle traversal. Finally, the fragments are colored and tested according to different sampling positions to generate continuous multi-frame display images of the current scene, and finally the generated display images are displayed through the display.

[0052] At the 0th frame, the original sampling position is sampled and rendered to obtain the first display image, then the 1st frame will determine the sampling position at a displacement position of half a pixel from the original sampling position along the pixel diagonal direction relative to the original sampling position as the sampling position of the second display image, the 2nd frame will be the same as the sampling position of the 0th frame, the 3rd frame will be the same as the sampling position of the 1st frame, then the even-numbered frames will have the same sampling position as the 0th frame, and the odd-numbered frames will have the same sampling position as the 1st frame.

[0053] After rasterization and shading are performed on even frames, since the sampling position of rasterization is changed in odd frames (the position is moved half a pixel along the diagonal direction), sampling and shading will be performed according to the changed sampling position in the rasterization stage, and finally the resolution of the corresponding size is determined as the output frame through Framebuffer resampling. For example, assuming that the resolution of the LCD display is n*n, according to the acquired frame signal, rasterization and shading are performed on even frames to obtain the first display image, and the sampling position after rasterization of odd frames is changed to obtain the second display image. The output of the display image with n*n resolution is determined to be output to the display through Framebuffer resampling.

[0054] It is understandable that since it takes a certain integration time for an image to be formed on the retina, the inter-frame imaging 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 during the integration time. In the case where the total display time of multiple consecutive frames of displayed images 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 an embodiment of the present application, the total display time of multiple consecutive frames of displayed images is less than the preset human eye integration time.

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

[0056] Therefore, the optical module 10 of the embodiment of the present application can adjust the display light of the display image based on the display images obtained at different sampling positions after the above-mentioned rasterized sampling rendering at different sampling positions.

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

[0058] See also Figure 3 The embodiment of the present application provides an optical module 10, which 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.

[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 display light to a target polarization angle, the sampling positions of the continuous multiple frames of display images are different, and the target polarization angle corresponds to the sampling position of the current frame display image; 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 component 13 is configured to converge the display light so that the emitted light is directed to a preset area.

[0060] Optionally, the sampling position includes 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.

[0061] 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°.

[0062] 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, such as 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, and 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.

[0063] The polarization modulator 11 is configured to adjust the polarization angle of the display light to the 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 will be displayed through the display 20. The display light emitted by the display image will have its polarization angle 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 will be 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 will be adjusted to the second target polarization angle after passing through the polarization modulator 11.

[0064] The refraction device 12 is configured to refract the 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 making the refraction angle correspond to the target polarization angle, the first refraction angle corresponds to the first target polarization angle, and the second refraction angle corresponds to the second target polarization angle, then, 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, so that the output position of the display light corresponding to the first sampling position after being refracted by the refraction device 12 is different from the output position of the display light corresponding to the second sampling position after being refracted by the refraction device 12.

[0065] 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 will be converged after passing through the optical path adjustment component 13, and the outgoing light will be directed to the preset area and enter the human eye.

[0066] That is to say, the display light of the first display image generated by sampling and rendering at the first sampling position corresponds to the light polarization at the first target polarization angle and the 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 the light polarization at the second target polarization angle and the 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, and 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, and when the display light of the first display image passes through the refraction device 12, the first refraction angle of refraction occurs; rasterized at the second sampling position, sampled and rendered to generate the second display image, and 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, and when the display light of the second display image passes through the refraction device 12, the second refraction angle of refraction occurs. In this way, the display light of the first display image and the display light of the second display image of 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 images of consecutive frames can achieve optical path splitting.

[0067] 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, and the display resolution can be improved without increasing the display screen.

[0068] 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, and when displaying, adjusts the display light of multiple frames of display images at different sampling positions through the optical module 10, so that the display position of the display image also changes in multiple frames, thereby superimposing images in the human eye through the visual persistence characteristics of the human eye to achieve an improvement in resolution.

[0069] See also Figure 3 In some embodiments, the polarization modulator 11, the refraction device 12 and the optical path adjustment component 13 are arranged in sequence 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. After passing through the quartz crystal 12, the P polarized light propagates in the manner of o light, and after passing through the quartz crystal 12, the S polarized light propagates in the manner of e light; after the P polarized light enters the polarization modulator 11, it is adjusted to 0° (0 phase) to become P polarized light, and adjusted to 90° (π phase) to become S polarized light; after the S polarized light enters the polarization modulator 11, it is adjusted to 0° (0 phase) to become S polarized light, and adjusted to 90° (π phase) to become P polarized light.

[0072] Specifically, the display light emitted by the display passes through the polarization modulator 11 and the quartz crystal 12 for light adjustment in sequence, and finally converges through the Fresnel lens 13 to enter the human eye. After passing through the quartz crystal 12, the P polarized light propagates in the manner of o light; after passing through the quartz crystal 12, the S polarized light propagates in the manner of e light, and the pixel projection images of the o light and the e light are offset according to the change of the sampling position after passing through the quartz crystal 12. 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 the corresponding sampling position changes are offset, and finally converged at the Fresnel lens 13 to enter the human eye.

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

[0074]

[0075] Where L is the width of a pixel on the display, Φ is the dispersion angle of e-light, and the solution is:

[0076]

[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, see Figure 3 , the display is an LCD display, emitting P polarized light as an example. Assume that the continuous multiple frames are divided into even frames and odd frames according to the frame sequence number, and count from the 0th frame (even frame). The sampling positions of the continuous odd frames and even frames have a half-pixel displacement in the diagonal direction of the pixel.

[0079] At the 0th frame (t=0), the first sampling position is rasterized and sampled and rendered to generate a first display image. By 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 in the manner of o light and is emitted along the original path;

[0080] At the first frame (t=1), the second sampling position is rasterized and sampled and rendered to generate a second display image. The P polarized light of the second display image entering the polarization modulator 11 is modulated by a second target polarization angle of 90° (π phase) to obtain S polarized light. After passing through the quartz crystal 12, the S polarized light propagates in the form 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.

[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 component 14 includes a beam splitter 141, a third phase retarder 142 and a reflective polarizer 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 retarder 142 is configured to switch one of linear polarized light and circular polarized light to the other, and the reflective polarizer film 143 is configured to transmit linear polarized light of a first preset polarization angle, and reflect linear polarized light of 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% 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 linear polarized light and circular polarized light, and the reflective polarizing film 143 transmits linear polarized light of a first preset polarization angle and reflects linear 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] See also 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, and 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 emission direction of the display light of the display 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 delay plate 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 delay plate 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 delay plate 15, a beam splitter 141, a third phase delay plate 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 after being adjusted by the first polarization modulator 111 to different target polarization angles corresponding to different sampling positions. After passing through the quartz crystal 12, the P polarized light propagates as the o light, and after passing through the quartz crystal 12, the S polarized light propagates as the e light. Thus, the pixel projection images of the o light and the e light will be offset according to the change of 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 modulated into P polarized light. After the P polarized light passes through the first phase retarder 15, the form of polarized light is changed and becomes right-handed polarized light RCP. After the right-handed polarized light RCP passes through the beam splitter 141, the form of polarized light remains right-handed polarized light RCP without changing, but the light energy is lost by 100%. Fifty percent, 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, 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, is transmitted 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 to 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 to 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 to 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 to 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 a shift 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, see Figure 4 , the display is an LCD display, emitting P polarized light as an example. Assume that the continuous multiple frames are divided into even frames and odd frames according to the frame sequence number, and count from the 0th frame (even frame). The sampling positions of the continuous odd frames and even frames have a half-pixel displacement in the diagonal direction of the pixel.

[0092] At the 0th frame (t=0), the first sampling position is rasterized and sampled and rendered 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, which is propagated as o light after passing through the quartz crystal 12;

[0093] At the first frame (t=1), the second sampling position is rasterized and sampled and rendered to generate a second display image. The first polarization modulator 111 is used to modulate the P polarized light of the second display image entering the first polarization modulator 111 by 90° (π phase) to obtain S polarized light, which is emitted and propagated as e-light offset by half a pixel relative to the 0th frame after passing through the quartz crystal 12;

[0094] After the o light obtained from the even frame and the e light obtained from the odd frame 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 the even frame to 0° and adjusts the target polarization angle (π phase) of the odd frame to 90°. Therefore, the display light of the even frame and the odd frame both obtain 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 is still 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 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 retarder 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.

[0095] It should be noted that the transmittance of the polarization modulator is about 45%, and each time the display light passes through the beam splitter 141, 50% of the light energy will be attenuated. 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] See also Figure 5 In some embodiments, the folded optical path component, the polarization modulator and the refraction device 12 are arranged in sequence 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 component 14, a polarization modulator 11 and a refraction device 12 arranged in sequence along the emission direction, and the second phase delay plate 16 is configured to adjust the linearly polarized light entering the folded optical path component to circularly polarized light.

[0098] The refraction device 12 comprises 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 becomes circularly polarized light after passing through the second phase retarder 16, and 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 at different target polarization angles corresponding to different sampling positions to obtain display light of different polarization states. After entering the quartz crystal 12, the display light of different polarization states is refracted according to the refraction angles corresponding to different sampling positions, and finally the display light of the relatively offset sampling position is obtained.

[0101] For example, see Figure 5 , the display is an LCD display, emitting P polarized light as an example. Assume that the continuous multiple frames are divided into even frames and odd frames according to the frame sequence number, and count from the 0th frame (even frame). The sampling positions of the continuous odd frames and even frames have a half-pixel displacement in the diagonal direction of the pixel.

[0102] In an even-numbered frame, rasterization and sampling rendering are performed at 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 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 is still the 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 into right-handed polarized light RCP after 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 passes through the third phase retarder 142 and is converted into S polarized light. 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 at 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 is propagated in the manner of o light.

[0103] In odd frames, the second sampling position is rasterized and sampled and rendered 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 delay plate 16. The right-handed polarized light RCP enters the beam splitter 141 without changing the polarization state and is still 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 delay plate 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 delay plate 142. RCP, the right-handed polarized light RCP is reflected on the beam splitter 141 to obtain the left-handed polarized light LCP, the left-handed polarized light LCP is converted into S-polarized light through the third phase delay plate 142, the S-polarized light is transmitted through the reflective polarizing film 143, and enters the polarization modulator 11 as S-polarized light, and is modulated by the second target polarization angle 0° to become S-polarized light, and after the S-polarized light passes through the quartz crystal 12, it is propagated 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] See also Figure 6 In the embodiment of the present application, since the optical module 10 will scale the pixels of the display, it is necessary to recalculate the required thickness of the birefringent crystal 12. The thickness of the birefringent crystal 12 is determined according to 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 Φ, the size f of the pixel of the display on the quartz crystal 12 after scaling can be obtained as:

[0105]

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

[0107]

[0108] Therefore, it can be calculated that the required thickness d' of the birefringent crystal 12 in the embodiment of the present application is:

[0109]

[0110] It can be understood that in the embodiment of the present application, compared with the previous application embodiment, 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, it is necessary to recalculate the thickness of the birefringent crystal based on the parameters. Different products have different parameters, so the thickness of the birefringent crystal needs to be calculated separately for different products.

[0111] See also 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 emission direction of the display light of the display image, and 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 linear polarized light entering the folded optical path component 14 to 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, the folded optical path component 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, and the reflective polarization film 143 is configured to transmit linear polarized light of a first preset polarization angle and reflect linear 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 component to linearly polarized light of a first preset polarization angle.

[0113] 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.

[0114] 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 delay plate 17, a beam splitter 141, a fourth polarization modulation device and a reflective polarization film 143, which are sequentially arranged 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, and the P polarized light is still obtained after being reflected on the reflective polarizing film 143. 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 increased by π / 2 at this time) to be transformed back into 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 (that is, the phase is increased by π / 2 at this time) to obtain S polarized light. The S polarized light reaches the reflective polarizing film 143 and is emitted;

[0116] 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 polarization 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 transformed back into left-handed polarized light LCP, and the left-handed polarized light LCP reflects 50% of the right-handed polarized light RCP when passing through the beam splitter 141, and 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, and the S polarized light reaches the reflective polarizing film 143 and penetrates; in this way, the display light of the first display image and the display light of the second display image are respectively modulated, and are emitted at a distance that varies with the offset relative to the first sampling position and are imaged in the human eye.

[0117] For example, see Figure 7, the display is an LCD display, emitting P polarized light as an example. Assume that the continuous multiple frames are divided into even frames and odd frames according to the frame sequence number, and count from the 0th frame (even frame). The sampling positions of the continuous odd frames and even frames have a half-pixel displacement in the diagonal direction of the pixel.

[0118] At the 0th frame (t=0), the first sampling position is rasterized and sampled and rendered to generate the first display image. The display light (P polarized light) of the first display image is emitted. After the P polarized light is modulated by the first target polarization angle (0°) of the third polarization modulator 113, it is emitted in a polarization state with a phase of 0. 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 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 the P polarized light is reflected on the reflective polarizing film 143, the 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 changes back to the 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 obtain the 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, and obtains the S polarized light. The S polarized light reaches the reflective polarizing film 143 and is transmitted;

[0119] At the first frame (t=1), the second sampling position is rasterized and sampled and rendered 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 in a polarization state with a phase of 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.

[0120] 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.

[0121] See also Figure 1 The display device 100 of the embodiment of the present 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 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, so as to synchronize the sampling rendering module 50 and the display control module 60, and 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] See also Figure 8 In the case where the current scene is sampled and rendered in 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 scenario, and generates a display image after performing pixel shading processing and Framebuffer resampling processing 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° 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 for imaging. The pixel shading processing and Framebuffer resampling processing of the GPU are continuously switched according to the frame signal, and the state of the polarization modulator is synchronously selected, so that the resolution is improved.

[0124] In the description of this specification, the descriptions with reference to the 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 contradictory.

[0125] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes 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 not be performed in 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 technicians in the technical field to which the embodiments of the present application belong.

[0126] 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