An optical module and VR device

Abstract

This application provides an optical module and a VR device, relating to the field of virtual reality technology. The module includes a first polarization unit, a second polarization unit, and a transmission unit. The first and second polarization units are arranged on the light-incident side of the transmission unit. Of the first ray emitted through the first polarization unit and the second ray emitted through the second polarization unit, one ray is left-handed circularly polarized light, and the other is right-handed circularly polarized light. After the first ray enters the transmission unit, it is refracted twice within the transmission unit, sequentially towards the light-out side of the transmission unit, the light-incident side of the transmission unit, and the light-out side of the transmission unit, before exiting from the light-out side of the transmission unit. The second ray is transmitted through the transmission unit and then exits from the transmission unit, so that the field of view of the second ray after exiting and the field of view of the first ray after exiting are superimposed, thereby expanding the field of view of the entire optical module.

Description

Technical Field

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

[0002] In recent years, with the introduction of the metaverse concept, virtual reality technology has developed unprecedentedly. In particular, the development of VR polarization folding optical path has greatly advanced the thinness and lightness of VR products, which has met the application requirements of most users.

[0003] Currently, the mainstream solution on the market is to use a folded optical path to match the LCD display. The basic principle is to utilize the polarization characteristics of light, combined with polarization devices, to fold the optical path back, thereby reducing the overall length of the light structure. Compared to the traditional Fresnel lens solution, this solution has significantly improved both FOV and resolution. However, even so, it still falls short of the human eye's angular resolution and focal length limits. With advancements in microdisplay development technology, users' demands for high PPD and large FOV are becoming increasingly clear. Summary of the Invention

[0004] The purpose of this application is to provide an optical module and VR device that can further improve the field of view of the module.

[0005] In one aspect of this application, an optical module is provided, including a first polarization unit, a second polarization unit, and a transmission unit. The first polarization unit and the second polarization unit are arranged on the light-incident side of the transmission unit. In the first light ray emitted through the first polarization unit and the second light ray emitted through the second polarization unit, one light ray is left-handed circularly polarized light, and the other light ray is right-handed circularly polarized light.

[0006] After the first light ray enters the transmission unit, it is reflected twice within the transmission unit towards the light-emitting side, the light-incident side, and the light-emitting side of the transmission unit, and then exits from the light-emitting side of the transmission unit; the second light ray is transmitted through the transmission unit and then exits from the transmission unit, so that the field of view of the second light ray after exiting is superimposed with the field of view of the first light ray after exiting.

[0007] Optionally, the transmission unit includes a beam splitter, a phase retarder, and a reflective polarizer arranged in sequence. The first light beam passes through the beam splitter and the phase retarder before reaching the reflective polarizer, and is then reflected by the reflective polarizer to the phase retarder and the beam splitter in sequence before being refracted back to the reflective polarizer. The second light beam is transmitted through the beam splitter, the phase retarder, and the reflective polarizer in sequence.

[0008] Optionally, the transmission unit further includes a first collimating lens, which is located between the beam splitter and the phase delay plate;

[0009] The beam splitter is a beam splitting film, which is disposed on the light-incident side or the light-outcident side of the first collimating lens.

[0010] Optionally, the transmission unit further includes a second collimating lens, which is located on the side of the phase delay film facing the first polarization unit, or on the side of the reflective polarizer away from the first polarization unit.

[0011] Optionally, the reflective polarizer and the phase delay film are deposited on the light-incident surface or the light-outcident surface of the second collimating lens.

[0012] Optionally, the first polarization unit includes a first polarizer and a first phase retarder arranged sequentially;

[0013] The second polarization unit includes a second polarizer and a second phase delay plate arranged sequentially.

[0014] Optionally, a third collimating lens is disposed between the first polarization unit and the transmission unit, and a fourth collimating lens is disposed between the second polarization unit and the transmission unit.

[0015] Optionally, a reflector is provided between the second polarization unit and the transmission unit. The second light rays emitted from the second polarization unit are deflected by the reflector and then enter the transmission unit in a preset direction.

[0016] Optionally, a third polarizing beam splitter is disposed between the second polarizer and the second phase delay film. The second light beam is emitted toward the transmission unit after passing through the third polarizing beam splitter, and a reflective element is disposed on the transmission surface of the third polarizing beam splitter.

[0017] Optionally, a fourth polarizing beam splitter is disposed between the second polarizer and the second phase delay film. After passing through the fourth polarizing beam splitter, the second light is emitted in a direction away from the transmission unit. The reflective surface of the fourth polarizing beam splitter is provided with a reflective element.

[0018] Optionally, a fifth collimating lens is provided on the transmission surface of the third polarizing beam splitter or the reflection surface of the fourth polarizing beam splitter, and the reflecting element is a reflective layer provided on the surface of the fifth collimating lens.

[0019] Optionally, a third phase delay plate may be provided between the third polarizing beam splitter and the reflecting element or between the fourth polarizing beam splitter and the reflecting element.

[0020] Optionally, a collimating prism is disposed between the second polarization unit and the transmission unit. After the second light ray enters the collimating prism, it undergoes total internal reflection within the collimating prism and then exits toward the transmission unit.

[0021] Optionally, the collimating prism has an incident surface facing the second polarization unit, and a first surface and a second surface facing the transmission unit and disposed opposite to each other, wherein the first surface is an arc surface close to the transmission unit, and the second surface is an arc surface away from the transmission unit;

[0022] The second light beam is incident on the first surface after passing through the incident surface of the collimating prism. After total internal reflection on the first surface, it is incident on the second surface, reflected back to the first surface by the second surface, and then transmitted through the first surface and exiting towards the transmission unit.

[0023] In another aspect of this application, a VR device is provided, including the optical module described above.

[0024] The optical module and VR device provided in this application embodiment have a first polarization unit and a second polarization unit arranged on the light-incident side of the transmission unit. A first light ray is emitted through the first polarization unit, and a second light ray is emitted through the second polarization unit. Among the first and second light rays, one beam is left-handed circularly polarized light, and the other beam is right-handed circularly polarized light. The first light ray enters the transmission unit and is transmitted sequentially towards the light-emitting side of the transmission unit, then refracted back towards the light-incident side of the transmission unit, and then refracted back again towards the light-emitting side of the transmission unit before being emitted. The second light ray is directly transmitted through the transmission unit and then emitted from the transmission unit. The first light ray is refracted twice within the transmission unit, and the second light ray is directly transmitted within the transmission unit, so that the field of view of the emitted second light ray is superimposed with the field of view of the emitted first light ray. By making full use of the spatial position at the edge of the first polarization unit to arrange the second polarization unit, the field of view of the second optical system formed by the second polarization unit and the transmission unit is seamlessly merged with that of the first optical system formed by the first polarization unit and the transmission unit. The field of view of the second optical system is extended to the field of view of the first optical system, thereby making up for the limitation of the limited field of view of a single system and expanding the field of view of the entire optical module. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1This is one of the schematic diagrams of the optical module structure provided in this embodiment;

[0027] Figure 2 This is the second schematic diagram of the optical module structure provided in this embodiment;

[0028] Figure 3 This is the third schematic diagram of the optical module structure provided in this embodiment;

[0029] Figure 4 This is the fourth schematic diagram of the optical module structure provided in this embodiment;

[0030] Figure 5a This is the fifth schematic diagram of the optical module structure provided in this embodiment;

[0031] Figure 5b This is the sixth schematic diagram of the optical module structure provided in this embodiment;

[0032] Figure 6 This is the seventh schematic diagram of the optical module structure provided in this embodiment.

[0033] Icons: 11-First screen; 12-First polarizer; 13-First phase retarder; 21-Second screen; 22-Second polarizer; 23-Second phase retarder; 4-First collimating lens; 41-Beam splitter; 5-Phase retarder; 6-Reflective polarizer; 7-Second collimating lens; 101-First ray; 102, 103, 202-Rays; 201-Second ray; 14-Third collimating lens; 24-First... Four collimating lenses; 25-reflecting mirror; 26-third polarizing beam splitter; 26'-fourth polarizing beam splitter; 27-third phase retarder; 28-reflective layer; 29-fifth collimating lens; 31-collimating prism; 32-first surface; 33-second surface; A, B-field angles; a1, a2, a3, a7, a8, a9, b1, b2, b3-ray rays; a4, a5, a6, b7, b8, b9-conjugate rays. Detailed Implementation

[0034] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0035] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] It should also be noted that, unless otherwise explicitly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] Current VR folding optical path structures are basically composed of an LCD display and matching imaging lenses, with the folding portion of the entire optical path utilizing the polarization characteristics of light. This method places high demands on the stress birefringence of the lenses, thus limiting the lens's refractive power. Furthermore, since the purpose of the folding optical path is to reduce the overall optical length, the number of lenses should not be excessive, generally not exceeding three. Under these combined constraints, its field of view (FOV) is mainly concentrated around 90–105 degrees, and the pixel density (PPD) is around 20–25, which is still somewhat different from the human eye's limiting angular resolution of 60 degrees and the dominant FOV of 120 degrees.

[0038] To address the aforementioned issues, this application provides an optical module that further enhances the field of view (FOV) by employing a dual-screen or multi-screen superimposed optical path on top of a polarization folding optical path. In this way, the FOV can be increased to over 120.

[0039] Specifically, please refer to Figure 1 As shown, this application embodiment provides an optical module, including: a first polarization unit, a second polarization unit, and a transmission unit. The first polarization unit and the second polarization unit are arranged on the light-incident side of the transmission unit. In the first light ray 101 emitted through the first polarization unit and the second light ray 201 emitted through the second polarization unit, one light ray is left-handed circularly polarized light and the other light ray is right-handed circularly polarized light.

[0040] After the first ray 101 enters the transmission unit, it is refracted twice within the transmission unit towards the light-emitting side, the light-incident side, and the light-emitting side of the transmission unit, and then exits from the light-emitting side of the transmission unit. The second ray 201 is transmitted through the transmission unit and then exits from the transmission unit, so that the field of view of the exited second ray 201 is superimposed with the field of view of the exited first ray 101.

[0041] The first polarization unit and the transmission unit form a first optical system, and the second polarization unit and the transmission unit form a second optical system. In other words, the transmission unit is shared by the first optical system and the second optical system, and the first optical system and the second optical system independently propagate light.

[0042] The first polarization unit corresponds to the first light source, and the second polarization unit corresponds to the second light source. For example, the first light source is the first screen 11, and the second light source is the second screen 21. The first screen 11 and the second screen 21 can be micro-display devices such as MicroLED and OLED, mainly to provide image sources for the system. The first light ray 101 emitted from the first screen 11 enters the transmission unit after passing through the first polarization unit, and the second light ray 201 emitted from the second screen 21 enters the transmission unit after passing through the second polarization unit.

[0043] In the non-shared parts of the first and second optical systems, the matching relationship of the polarization characteristics of the light rays requires that the two rays satisfy a left-handed versus right-handed polarization difference before reaching the beam splitter 41. Specifically, of the first ray 101 emitted from the first polarization unit and the second ray 201 emitted from the second polarization unit, one ray is left-handed circularly polarized light, and the other is right-handed circularly polarized light; that is, if the first ray 101 is left-handed circularly polarized light, then the second ray 201 is right-handed circularly polarized light; if the first ray 101 is right-handed circularly polarized light, then the second ray 201 is left-handed circularly polarized light; the circular polarization characteristics of the first ray 101 and the second ray 201 are different.

[0044] The first polarization unit includes a first polarizer 12 and a first phase delay film 13 arranged in sequence. The first light ray 101 emitted from the first screen 11 passes through the first polarizer 12 and the first phase delay film 13 in sequence before being emitted toward the transmission unit. The second polarization unit includes a second polarizer 22 and a second phase delay film 23 arranged in sequence. The second light ray 201 emitted from the second screen 21 passes through the second polarizer 22 and the second phase delay film 23 in sequence before being emitted toward the transmission unit.

[0045] The first optical system is a polarization-reflecting optical system. After the first ray 101 enters the transmission unit, it first exits towards the light-emitting side of the transmission unit, then refracts back towards the light-incident side of the transmission unit. Then, the first ray 101 refracts back again towards the light-emitting side of the transmission unit and exits from the light-emitting side of the transmission unit. The first ray 101 refracts twice within the transmission unit.

[0046] The second optical system is a direct-transmission optical system. The second light ray 201 is directly transmitted through the transmission unit and then emitted from the transmission unit. In this way, the field of view of the second optical system can be extended to the field of view of the first optical system, thereby expanding the field of view of the entire optical module.

[0047] Therefore, in the optical module provided in this application embodiment, the first polarization unit and the second polarization unit are arranged on the light-incident side of the transmission unit. The first polarization unit emits a first light ray 101, and the second polarization unit emits a second light ray 201. Among the first light ray 101 and the second light ray 201, one light ray is left-handed circularly polarized light, and the other light ray is right-handed circularly polarized light. The first light ray 101 is incident on the transmission unit, and within the transmission unit, it is transmitted sequentially toward the light-emitting side of the transmission unit, then folded back toward the light-incident side of the transmission unit, and then folded back again toward the light-emitting side of the transmission unit before being emitted. The second light ray 201 is directly transmitted through the transmission unit and then emitted from the transmission unit. The first light ray 101 is folded back twice within the transmission unit, and the second light ray 201 is directly transmitted within the transmission unit, so that the field of view of the emitted second light ray 201 is superimposed with the field of view of the emitted first light ray 101. By making full use of the spatial position at the edge of the first polarization unit to arrange the second polarization unit, the field of view of the second optical system formed by the second polarization unit and the transmission unit is seamlessly merged with that of the first optical system formed by the first polarization unit and the transmission unit. The field of view of the second optical system is extended to the field of view of the first optical system, thereby making up for the limitation of the limited field of view of a single system and expanding the field of view of the entire optical module.

[0048] Furthermore, in one embodiment of this application, the transmission unit includes a beam splitter, a phase retarder 5, and a reflective polarizer 6 arranged sequentially. The first light ray 101 passes through the beam splitter and the phase retarder 5 and reaches the reflective polarizer 6, and is reflected by the reflective polarizer 6 sequentially to the phase retarder 5 and the beam splitter before being refracted back to the reflective polarizer 6. The second light ray 201 is transmitted sequentially through the beam splitter, the phase retarder 5, and the reflective polarizer 6.

[0049] Based on this, the transmission unit also includes a first collimating lens 4, which is located between the beam splitter and the phase delay plate 5.

[0050] In one possible implementation of this application, the beam splitter can be a beam-splitting film 41, which is disposed on the incident or emitting side of the first collimating lens 4; Figure 1 In the middle, the light enters from the right side, and the beam splitter 41 is located on the light-entry side (right side) of the first collimating lens 4.

[0051] For the first optical system formed by the first polarization unit and the transmission unit, the first ray 101 is emitted from the first screen 11, passes through the first polarizer 12, the first phase retarder 13, the beam splitter 41, the first collimating lens 4, and the phase retarder 5 before reaching the reflective polarizer 6. At this point, due to polarization characteristics, the first ray 101 is reflected on the surface of the reflective polarizer 6 and becomes ray 102. Ray 102 then passes through the phase retarder 5 and the first collimating lens 4 again along its path to reach the beam splitter 41, where it is reflected again to become ray 103. The reflected ray 103 also passes through the first collimating lens 4 and the phase retarder 5 before reaching the reflective polarizer 6 again. Since the first ray 101 passes through the phase retarder 5 twice, the polarization state of the first ray 101 undergoes an orthogonal change. Finally, ray 103 passes through the reflective polarizer 6 and finally reaches the human eye to form an image.

[0052] In the second optical system formed by the second polarization unit and the transmission unit, the second ray 201, emitted from the second screen 21, passes through the second polarizer 22 and the second phase retardation plate 23. Its circular polarization state is exactly opposite to that of the first optical system. Therefore, when the second ray 201 propagates to the reflective polarizer 6, its linear polarization state is exactly orthogonal to that of the first optical system. At this time, the second ray 201 passes through the reflective polarizer 6 and becomes ray 202, which ultimately reaches the human eye for imaging. In this way, the field of view B of the second optical system can be extended to the field of view A of the first optical system, thereby expanding the field of view of the entire optical module.

[0053] In addition, the transmission unit also includes a second collimating lens 7, which is located on the side of the phase retarder 5 facing the first polarization unit, or on the side of the reflective polarizer 6 away from the first polarization unit. The reflective polarizer and the phase retarder 5 can be deposited on the light-incident surface or the light-outcident surface of the second collimating lens 7 as a film layer or a dielectric coating, as long as the order relationship between the phase retarder 5 and the reflective polarizer 6 remains unchanged.

[0054] It should be noted that, since the images formed by the first optical system formed by the first polarization unit and the transmission unit and the second optical system formed by the second polarization unit and the transmission unit need to be seamlessly connected, the content displayed on the first screen 11 and the second screen 21 must be partially the same, and the corresponding viewing angles must be exactly the same.

[0055] Figure 2The diagram illustrates the light propagation paths corresponding to the overlapping content. Rays a1, a2, and a3 are the center and edge rays emitted from the edge content of the first optical system. After being reflected by the reflective polarizer 6 in the first optical system, they become conjugate rays a4, a5, and a6, respectively. These are then reflected by the beam splitter 41 into rays a7, a8, and a9, which reach the human eye. Rays b1, b2, and b3 from the second optical system, representing the center and edge rays respectively, are collimated by the second optical system, and their outgoing conjugate rays are b7, b8, and b9, respectively. Due to the different optical paths of the two systems, on the surface of the beam splitter 41, conjugate rays a4, a5, and a6 are in a reflective conjugate relationship with rays a7, a8, and a9, while rays b1, b2, and b3 are in a refractive conjugate relationship with their conjugate rays b7, b8, and b9. Through this matching relationship of reflection and refraction, light rays a7, a8, and a9 can be completely superimposed with conjugate light rays b7, b8, and b9, respectively, thus seamlessly connecting the images projected by the two systems.

[0056] Furthermore, the two systems mentioned above can be extended to multiple systems to expand the field of view in all directions (up, down, left, and right). The field of view can be combined using two or more systems. The main field of view is a polarization reflection system (first optical system), and there is one first optical system. The extended field of view system is a direct-view magnification system (second optical system), and there can be two or more second optical systems. In this way, the range of the superimposed field of view is larger.

[0057] In addition to the two collimating lenses mentioned above, other lenses can be added between any two components of the optical module to achieve the corresponding function without affecting the operation of the optical path. For example... Figure 3 As shown, a third collimating lens 14 is disposed between the first polarization unit and the transmission unit, and a fourth collimating lens 24 is disposed between the second polarization unit and the transmission unit to further improve the FOV and imaging quality of the system. The third collimating lens 14 and the fourth collimating lens 24 can be placed at any position between the beam splitter 41 and the first screen 11 or the second screen 21, and the number of lenses is not limited.

[0058] For example Figure 4 As shown, a reflector is disposed between the second polarization unit and the transmission unit. The second light ray 201 emitted from the second polarization unit is deflected by the reflector 25 and then enters the transmission unit in a preset direction. Since the second optical system is a direct-transmission system, the back focal length may be relatively long. By adding the reflector 25 to the second optical system, the overall thickness of the entire optical module can be reduced.

[0059] In addition, a third polarizing beam splitter 26 is disposed between the second polarizer 22 and the second phase delay film 23. The second light beam 201 is emitted toward the transmission unit after passing through the third polarizing beam splitter 26. A reflective element is disposed on the transmission surface of the third polarizing beam splitter 26.

[0060] Alternatively, a fourth polarizing beam splitter 26' may be disposed between the second polarizer 22 and the second phase delay film 23. After passing through the fourth polarizing beam splitter 26', the second light 201 is emitted in a direction away from the transmission unit. The reflective surface of the fourth polarizing beam splitter 26' is provided with a reflective element.

[0061] Based on this, a fifth collimating lens 29 is provided on the transmission surface of the third polarizing beam splitter 26 or the reflection surface of the fourth polarizing beam splitter 26', and the reflecting element is a reflective layer 28 provided on the surface of the fifth collimating lens 29.

[0062] A third phase delay plate 27 is also provided between the third polarizing beam splitter 26 and the reflecting element or between the fourth polarizing beam splitter 26' and the reflecting element.

[0063] Figure 5a , Figure 5b They are respectively in Figure 4 A further extension of the second optical system is shown, wherein the third polarizing beam splitter 26 and the fourth polarizing beam splitter 26' can be attached with an outer film or coated with a dielectric layer. The fifth collimating lens 29 has a reflective layer 28 coated on its outer surface. The third phase retarder 27 is located between the third polarizing beam splitter 26 and the reflective element, and between the fourth polarizing beam splitter 26' and the reflective element. When the second light ray 201 is emitted from the second screen 21, the second light ray 201 will be transmitted (…). Figure 5a ) or reflection ( Figure 5b The light ray 201 is reflected onto the reflective layer 28 of the fifth collimating lens 29, and then travels along the light path to the reflective layer 28. Figure 4 A further extension of the second optical system is shown, in which the surface of the third polarizing beam splitter 26 reflects ( Figure 5a ) or the fourth polarizing beam splitter 26' transmission ( Figure 5b The image quality is further improved and the field of view is expanded by using the fifth collimating lens 29 in this way, and then the image is finally sent to the second phase delay film 23.

[0064] This application also discloses an embodiment, please refer to Figure 6 As shown, a collimating prism 31 is provided between the second polarization unit and the transmission unit. After the second ray 201 enters the collimating prism 31, it undergoes total internal reflection within the collimating prism 31 and then exits toward the transmission unit.

[0065] The collimating prism 31 has an incident light surface facing the second polarization unit, and a first surface 32 and a second surface 33 facing the transmission unit and disposed opposite to each other. The first surface 32 is an arc surface close to the transmission unit, and the second surface 33 is an arc surface away from the transmission unit. The incident light surface is an inclined plane, the curvature of the first surface 32 is greater than the curvature of the second surface 33, and a reflective film is disposed on the second surface 33. The side surface of the collimating prism 31 forms... Figure 6 The triangle-like shape shown.

[0066] The second ray 201 is incident on the first surface 32 after passing through the incident surface of the collimating prism 31. After total reflection on the first surface 32, it is incident on the second surface 33, reflected back to the first surface 32, and then emitted towards the transmission unit after being transmitted through the first surface 32.

[0067] On the other hand, embodiments of this application also provide a VR device, such as VR glasses, including the aforementioned optical module.

[0068] This VR device includes the same structure and beneficial effects as the optical module in the foregoing embodiments. The structure and beneficial effects of the optical module have been described in detail in the foregoing embodiments and will not be repeated here.

[0069] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An optical module, characterized in that, include: A first polarization unit, a second polarization unit, and a transmission unit are provided. The first polarization unit and the second polarization unit are arranged on the light-incident side of the transmission unit. In the first light ray emitted through the first polarization unit and the second light ray emitted through the second polarization unit, one light ray is left-handed circularly polarized light and the other light ray is right-handed circularly polarized light. After the first light beam enters the transmission unit, it is reflected twice within the transmission unit towards the light-emitting side, the light-incident side, and the light-emitting side of the transmission unit, and then exits from the light-emitting side of the transmission unit. The second ray is transmitted through the transmission unit and then emitted from the transmission unit, so that the field of view of the emitted second ray is superimposed with the field of view of the emitted first ray. The first polarization unit corresponds to the first screen, and the second polarization unit corresponds to the second screen. The content displayed on the first screen and the second screen are the same, and the corresponding viewing angles are exactly the same. The second polarization unit is arranged at the spatial position of the edge of the first polarization unit, so that the second optical system formed by the second polarization unit and the transmission unit is seamlessly merged with the field of view of the first optical system formed by the first polarization unit and the transmission unit. The field of view of the second optical system is extended to the field of view of the first optical system. The transmission unit includes a beam splitter, a phase retarder, and a reflective polarizer arranged in sequence. The first light beam passes through the beam splitter and the phase retarder before reaching the reflective polarizer, and is then reflected by the reflective polarizer to the phase retarder and the beam splitter before being refracted back to the reflective polarizer. The second light beam is transmitted through the beam splitter, the phase retarder, and the reflective polarizer in sequence.

2. The optical module according to claim 1, wherein The transmission unit further includes a first collimating lens, which is located between the beam splitter and the phase delay plate. The beam splitter is a beam splitting film, which is disposed on the light-incident side or the light-outcident side of the first collimating lens.

3. The optical module according to claim 2, wherein The transmission unit further includes a second collimating lens, which is located on the side of the phase delay film facing the first polarization unit, or on the side of the reflective polarizer away from the first polarization unit.

4. The optical module according to claim 3, wherein The reflective polarizer and the phase delay film are deposited on the light-incident surface or the light-outceasing surface of the second collimating lens.

5. The optical module according to claim 1, wherein The first polarization unit includes a first polarizer and a first phase retarder arranged sequentially; The second polarization unit includes a second polarizer and a second phase delay plate arranged sequentially.

6. The optical module according to any one of claims 1 to 5, wherein A third collimating lens is disposed between the first polarization unit and the transmission unit, and a fourth collimating lens is disposed between the second polarization unit and the transmission unit.

7. The optical module according to any one of claims 1 to 5, characterized in that, A reflector is provided between the second polarization unit and the transmission unit. The second light rays emitted from the second polarization unit are deflected by the reflector and then enter the transmission unit in a preset direction.

8. The optical module according to claim 5, characterized in that, A third polarizing beam splitter is disposed between the second polarizer and the second phase delay plate. The second light beam is emitted toward the transmission unit after passing through the third polarizing beam splitter. A reflective element is disposed on the transmission surface of the third polarizing beam splitter.

9. The optical module according to claim 8, characterized in that, A fourth polarizing beam splitter is disposed between the second polarizer and the second phase delay plate. After passing through the fourth polarizing beam splitter, the second light is emitted in a direction away from the transmission unit. The reflective surface of the fourth polarizing beam splitter is provided with a reflective element.

10. The optical module according to claim 9, characterized in that, The transmission surface of the third polarizing beam splitter or the reflection surface of the fourth polarizing beam splitter is provided with a fifth collimating lens, and the reflecting element is a reflective layer provided on the surface of the fifth collimating lens.

11. The optical module according to claim 9, characterized in that, A third phase delay plate is also provided between the third polarizing beam splitter and the reflecting element or between the fourth polarizing beam splitter and the reflecting element.

12. The optical module according to any one of claims 1 to 5, characterized in that, A collimating prism is disposed between the second polarization unit and the transmission unit. After the second light ray enters the collimating prism, it undergoes total internal reflection within the collimating prism and then exits toward the transmission unit.

13. The optical module according to claim 12, characterized in that, The collimating prism has an incident surface facing the second polarization unit, and a first surface and a second surface facing the transmission unit and disposed opposite to each other. The first surface is an arc surface close to the transmission unit, and the second surface is an arc surface away from the transmission unit. The second light beam is incident on the first surface after passing through the incident surface of the collimating prism. After total internal reflection on the first surface, it is incident on the second surface, reflected back to the first surface by the second surface, and then transmitted through the first surface and exiting towards the transmission unit.

14. A VR device, characterized in that, Includes the optical module as described in any one of claims 1 to 13.

Images