Lens module, display apparatus, and augmented reality display device

Abstract

Embodiments of the present application relate to the field of optical structures. Disclosed are a lens module, a display apparatus, and an augmented reality display device, used for solving the problem of large size of the lens module. The specific solution comprises: the lens module comprises a linear polarizer, a first polarization transflective member, a first reflection assembly, a second polarization transflective member, and a second reflection assembly. First light is respectively reflected once by the first polarization transflective member, the first reflection assembly, the second polarization transflective member, and the second reflection assembly before entering the eyes of a user, so that the first light is transmitted to the eyes of the user after being reflected multiple times. An incident angle of the first light can be adjusted to reduce the size of the lens module.

Description

Lens module, display device, and augmented reality display device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 22, 2023, with application number 202311807773.6 and application name “Lens module, display device and augmented reality display device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of optical structures, and in particular to a lens module, a display device, and an augmented reality display device. Background Art

[0003] The principle of augmented reality (AR) technology is to use a computer-controlled image projector to project display light carrying digital content into the human eye to form a virtual scene, and superimpose the virtual scene with the real scene of the outside world that the human eye can directly see, so that the human eye can see image information that combines the virtual scene and the real scene of the outside world.

[0004] As augmented reality devices become more commercially available, users have higher requirements for them. For example, they require augmented reality devices to be small and easy to carry. Therefore, reducing the size of augmented reality devices has become an urgent problem to be solved.

[0005] Summary of the Invention

[0006] The present application provides a lens module, a display device, and an augmented reality display apparatus, which are used to improve the problem of the large size of the lens module.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions.

[0008] In a first aspect, an embodiment of the present application provides a lens module. The lens module includes a linear polarizer, a first polarizing reflective element, a first reflective assembly, a second polarizing reflective element, and a second reflective assembly. The linear polarizer is used to emit a first light ray. The first polarizing reflective element is used to transmit the first light ray emitted by the linear polarizer to the first reflective assembly. The first reflective assembly is used to reflect the first light ray transmitted by the first polarizing reflective element to the first polarizing reflective element, and the polarization directions of the first light ray received by the first reflective assembly and the first light ray reflected by the first reflective assembly are perpendicular to each other. The first polarizing reflective element is also used to reflect the first light ray reflected by the first reflective assembly to the second polarizing reflective element. The second polarizing reflective element is used to reflect the first light ray reflected by the first polarizing reflective element. The second reflective assembly is used to reflect the first light ray reflected by the second polarizing reflective element to the second polarizing reflective element. The polarization directions of the first light ray received by the second reflective assembly and the first light ray reflected by the second reflective assembly are perpendicular to each other. The second polarizing reflective element is also used to transmit the first light ray reflected by the second reflective assembly. The first light ray transmitted by the second polarizing transflective element can enter the user's eyes. Before entering the user's eyes, the first light ray is reflected once by the first polarizing transflective element, the first reflective component, the second polarizing transflective element, and the second reflective component, causing the first light ray to be folded back. During the process of being reflected from the first reflective component to the first polarizing transflective element, and during the process of being reflected from the second reflective component to the second polarizing transflective element, the propagation direction of the first light ray is not restricted. In this way, the path of the first light ray folded back between the first reflective component and the first polarizing transflective element can be adjusted so that the paths of the first light ray are highly overlapped during this folding process, thereby reducing the thickness of the lens module.

[0009] In combination with the first aspect, in some feasible embodiments, the lens module further includes: a first lens. The first lens is located on the side of the second reflective component away from the second polarized reflective element. The surface of the second reflective component facing the first lens is a first curved surface, and the surface of the first lens facing the second reflective component is a second curved surface, and the first curved surface is bonded to the second curved surface. The first lens is used to transmit the second light to the second reflective component, and the second reflective component is also used to transmit the second light transmitted by the first lens. The second polarized reflective element is also used to transmit the second light transmitted by the second reflective element. Thus, the second light transmitted by the second reflective component through the second polarized reflective element can be transmitted to the user's eyes, and the user can receive the second light to pass through the picture on the side of the first lens away from the second reflective component. In addition, the first curved surface and the second curved surface are bonded, and the transmission direction of the second light does not change when passing through the first curved surface and the second curved surface.

[0010] In conjunction with the first aspect, in some achievable embodiments, the lens module further includes: a second lens. The second lens is located on a side of the second polarizing reflective element facing away from the second reflective assembly, and the surface of the second lens facing the first polarizing reflective element is bonded to the surface of the first polarizing reflective element facing the second lens. Thus, the second lens is used to transmit the first light and the second light that pass through the second polarizing reflective element. Because the surface of the second lens facing the first polarizing reflective element is bonded to the surface of the first polarizing reflective element facing the second lens, the optical directions of the second light and the first light do not change when they pass through the optical surface.

[0011] In conjunction with the first aspect, in some achievable embodiments, the first reflective assembly includes a reflective element and a quarter-wave plate. The quarter-wave plate is located on a side of the reflective element facing the first polarizing transflective element. Thus, after a first light ray with a first polarization direction passes through the quarter-wave plate twice, its polarization direction is changed to produce a first light ray with a second polarization direction. The reflective element can change the transmission direction of the first light ray.

[0012] In conjunction with the first aspect, in some achievable embodiments, the reflective element includes a reflective surface and a first convex surface disposed opposite each other. The reflective surface is located on a side of the reflective element facing away from the first polarizing transflective element, and the first convex surface is disposed protrudingly toward the first polarizing transflective element. Thus, during transmission of the first light ray within the reflective element, the first light ray is first reflected by the reflective surface and then passes through the first convex surface to be projected onto the quarter-wave plate. Because the first convex surface is disposed protrudingly toward the first polarizing transflective element, the first convex surface has a converging effect on the first light ray, facilitating imaging of the first light ray and improving imaging quality.

[0013] In conjunction with the first aspect, in some achievable embodiments, the optical axis of the reflective surface is coaxial with the optical axis of the first convex surface. This allows for a high degree of overlap between the optical paths of the first light beam received by the first reflective component and the first light beam reflected by the first reflective component, thereby reducing the height of the first reflective component and the first polarizing transflective element. This facilitates reducing the volume of the lens module.

[0014] In conjunction with the first aspect, in some achievable embodiments, the normal to the reflective surface of the first polarizing transflective element, the normal to the reflective surface of the second polarizing transflective element, and the optical axis of the first reflective assembly are not coplanar. Thus, during the transmission of the first light ray through the lens module, the optical axes of the first light ray are not coplanar, allowing the dimensions of the lens module to be adjusted in multiple directions. For example, the thickness, height, and width of the lens module can be adjusted to provide a variety of lens module shapes.

[0015] In conjunction with the first aspect, in some achievable embodiments, the normal to the reflective surface of the first polarizing transflective element is perpendicular to a reference plane, where the reference plane is a plane containing the optical axis of the second reflective assembly and the normal to the reflective surface of the second polarizing transflective element. This allows the first light to propagate more compactly within the lens module, shortening its path and further reducing the size of the lens module.

[0016] In combination with the first aspect, in some achievable embodiments, the lens module further includes: an optical waveguide. The optical waveguide includes an input portion and a output portion, wherein the output portion is disposed on a side of the second polarizing reflective element facing away from the second reflective component. The linear polarizer is further configured to emit a third light ray, and the first polarizing reflective element is further configured to transmit the third light ray to the input portion, and the output portion is configured to couple out the third light ray coupled in by the input portion. The optical waveguide can couple out the third light ray to one side of the second polarizing reflective element, thereby further increasing the field of view of the lens module.

[0017] In conjunction with the first aspect, in some achievable embodiments, the first reflective component and the second polarization transflective element are both connected to the optical waveguide, thereby reducing the degree of freedom of the optical waveguide, simplifying the assembly process, and reducing assembly costs.

[0018] In conjunction with the first aspect, in some achievable embodiments, the lens module further includes a third lens configured to transmit the first light reflected by the first polarizing transflective element to the second polarizing transflective element. The surface of the third lens facing away from the first polarizing transflective element is a second convex surface, which is convexly disposed away from the first polarizing transflective element. The second convex surface functions to converge light, thereby eliminating aberrations of the first light and improving imaging quality.

[0019] In combination with the first aspect, in some feasible embodiments, the lens module further includes: a third reflective component. The first polarizing reflective element is used to transmit the first light emitted by the linear polarizer to the first reflective component, including: the first polarizing reflective element is used to reflect the first light emitted by the linear polarizer to the third reflective component, the third reflective component is used to reflect the first light reflected by the first polarizing reflective element to the first polarizing reflective element, and the first polarizing reflective element is used to transmit the first light reflected by the third reflective component to the first reflective component, wherein the polarization directions of the first light received by the third reflective component and the first light reflected by the third reflective component are perpendicular to each other. In this way, the third reflective component increases the distance that the first light propagates in the medium, and reduces the divergence angle of the first light when the optical path of the first light is the same. The third reflective component adds a reflective surface to the first light, provides more optical focal length for the first light, and increases the degree of freedom for optimizing aberrations, thereby further optimizing the imaging quality of the first light.

[0020] In conjunction with the first aspect, in some achievable embodiments, the first polarizing transflective element includes a polarizing beam splitter prism. Alternatively, the first polarizing transflective element includes a connected flat plate and a polarizing reflective film. Thus, both of the aforementioned first polarizing transflective elements can transmit light with a first polarization direction and reflect light with a second polarization direction, with the first polarization direction and the second polarization direction being perpendicular.

[0021] In a second aspect, embodiments of the present application provide a display device. The display device comprises: a display screen and any one of the lens modules provided in the first aspect. The display screen is configured to generate imaging light containing image information and project the imaging light onto the first polarizer. Because the lens module has the advantages of high integration and small size, a display device including this lens module obviously also has the advantages of high integration and small size.

[0022] In a third aspect, embodiments of the present application provide an augmented reality device. The augmented reality device includes a processor and any display device provided in the second aspect, wherein the processor is configured to send image data to the display device. Due to the small size of the display device, the augmented reality device is also correspondingly small, making it easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1a is a schematic structural diagram of AR glasses.

[0024] FIG1b is a schematic structural diagram of an augmented reality device.

[0025] FIG. 2 is a schematic diagram of the structure of a display module in the related art.

[0026] FIG3 a is a schematic structural diagram of a lens module provided in an embodiment of the present application.

[0027] FIG. 3 b is a graph showing an MTF (modulation transfer function) curve of the lens module shown in FIG. 3 a .

[0028] FIG4 is a schematic structural diagram of a first polarization transflective element provided in an embodiment of the present application.

[0029] FIG5 a is a schematic structural diagram of another lens module provided in an embodiment of the present application.

[0030] FIG. 5 b is an MTF curve diagram of the lens module shown in FIG. 5 a .

[0031] FIG6 is a schematic structural diagram of another lens module provided in an embodiment of the present application.

[0032] FIG7 is a schematic structural diagram of another lens module provided in an embodiment of the present application.

[0033] FIG8 a is a schematic diagram of a display screen and a screen viewed by a user provided in an embodiment of the present application.

[0034] FIG8 b is a schematic structural diagram of another lens module provided in an embodiment of the present application.

[0035] FIG9 is a schematic structural diagram of another lens module provided in an embodiment of the present application.

[0036] In the figure: 10-augmented reality device; 100-lens module; 001-display module; 002-screen; 003-lens; 004-reflector; 005-flat glass; 006-polarized reflective layer; 007-quarter phase delay plate; 11-processor; 21-display screen; 20-display device; 110-linear polarizer; 120-first polarized transflective element; 130-first reflective component; 140-second polarized transflective element; 150-second reflective Components; 101-first light; 121-flat plate; 122-polarized reflective film; 131-reflective element; 132-quarter wave plate; 160-third lens; 170-third reflective component; 180-first lens; 101-first light; 102-second light; 103-third light; 190-second lens; 210-optical waveguide; 211-coupling part; 212-outcoupling part; 21-edge area; 22-center area; 201-sub-display screen. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0038] Hereinafter, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0039] In addition, in this application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the components in the drawings.

[0040] The display device provided in the embodiment of the present application is integrated into an augmented reality (AR) device, and the AR device includes but is not limited to AR glasses or AR helmets. Figure 1a is a structural schematic diagram of AR glasses. Please refer to Figure 1a. The augmented reality device 10 is integrated into the AR glasses. Users can wear AR glasses to play games, watch videos, participate in virtual meetings, or video shopping. It is understandable that the display device provided in this application can also be used in other possible scenarios, such as medical equipment, which is not limited in the embodiment of this application.

[0041] FIG1b is a schematic diagram of the structure of an augmented reality device 10. Referring to FIG1b , the augmented reality device 10 includes a processor 11 and a display device 20. The processor 11 and the display device 20 are signal-connected, and the processor 11 is configured to send image data to the display device 20. For example, the augmented reality device 10 may include one or more processors 11, such as a graphics processing unit (GPU).

[0042] In Figure 1b, the display device 20 includes a display screen 21 and a lens module 100. The display screen 21 is signal-connected to the processor 11. The display screen 21 is configured to receive image data sent by the processor 11 and generate imaging light containing image information based on the image data. The imaging light is then projected toward the lens module 100. The imaging light is formed by the lens module 100 and enters the user's eyes.

[0043] The embodiment of the present application does not limit the type of the display screen 21. For example, the display screen 21 may include a liquid crystal display panel (LCD), a light emitting diode (LED) display panel, or an organic light-emitting diode (OLED) display panel.

[0044] In an embodiment where the display device 20 is integrated into the AR glasses, the display device 20 is provided in the frame, and the processor 11 can be provided in the temple or the frame, which is not limited in this embodiment of the present application. In addition, the AR glasses can be provided with two display devices 20, one display device 20 is integrated into the left frame, and the imaging light projected by the display device 20 enters the user's left eye. The other display device 20 is integrated into the right frame, and the imaging light projected by the display device 20 enters the user's right eye. Alternatively, in other embodiments, the AR glasses can be provided with only one display device 20, which is not limited in this embodiment of the present application.

[0045] For ease of description, the x-direction is defined as the direction of the user's line of sight when viewing the display device 20. For AR glasses, for example, the x-direction corresponds to the thickness of the glasses. The length of the frame is defined as the y-direction, and the height of the frame is defined as the z-direction (as shown in FIG3a ). The x-direction, y-direction, and z-direction are mutually perpendicular. In FIG1b , the size of the display device 20 directly affects the volume of the AR glasses.

[0046] Figure 2 is a schematic diagram of the structure of a display module 001 in the related art. Referring to Figure 2, display module 001 includes screen 002, lens 003, reflector 004, flat glass 005, polarizing reflective layer 006, and quarter-wave retarder 007. Flat glass 005 and polarizing reflective layer 006 are laminated together. Image light emitted from screen 002 passes through lens 003 and is projected onto polarizing reflective layer 006. Polarizing reflective layer 006 reflects light in the first polarization direction of the image light, which then passes through quarter-wave retarder 007 and is then projected onto polarizing reflective layer 006. After being reflected by polarizing reflective layer 006, the light passes through quarter-wave retarder 007 again. These two passes through quarter-wave retarder 007 cause the polarization direction of the light to become perpendicular to the first polarization direction. Light that has passed through quarter-wave retarder 007 again passes through flat glass 005 and enters the user's eyes.

[0047] In Figure 2, the distance between reflector 004 and polarizing reflective layer 006 along the x-direction is directly related to the field of view (FOV) α, which is the angle between the light emitted from the edge of the display and the line connecting the observation point (e.g., the user's eye). To increase FOV α, the distance between reflector 004 and polarizing reflective layer 006 along the x-direction needs to be increased to avoid interference between them. This obviously increases the size of display module 001. Alternatively, to increase FOV α, flat glass 005 can be rotated clockwise. To avoid interference between flat glass 005 and lens 003, the distance between flat glass 005 and lens 003 along the x-direction also needs to be increased, which also increases the size of display module 001.

[0048] Therefore, the display device 20 provided in the embodiment of the present application can have the advantages of a large field of view and a small size.

[0049] FIG3 a is a schematic structural diagram of a lens module 100 provided in an embodiment of the present application. Referring to FIG3 a , the lens module 100 includes a linear polarizer 110 , a first polarizing transflective element 120 , a first reflective assembly 130 , a second polarizing transflective element 140 , and a second reflective assembly 150 .

[0050] The linear polarizer 110 is used to emit the first light 101, and the polarization direction of the first light 101 is the first polarization direction. For example, the imaging light emitted by the display screen 21 (as shown in FIG1 b ) passes through the linear polarizer 110 to form linearly polarized light with the first polarization direction.

[0051] During use, the first light 101 passes through the first polarizing transflective element 120 , the first reflective component 130 , the first polarizing transflective element 120 , the second polarizing transflective element 140 , the second reflective component 150 and the second polarizing transflective element 140 in sequence before entering the user's eyes.

[0052] In FIG3 a , the viewing angle of the lens module 100 along the z direction is β, where β is the angle between the edge light passing through the edge of the second polarizing transflective element 140 and entering the user's eye and the line connecting the user's eye.

[0053] The first polarizing transflective element 120 is configured to transmit the first light 101 transmitted from the linear polarizer 110. The first reflective assembly 130 is configured to reflect the first light 101 transmitted by the first polarizing transflective element 120 back to the first polarizing transflective element 120. The polarization directions of the first light 101 received by the first reflective assembly 130 and the first light 101 reflected by the first reflective assembly 130 are perpendicular to each other. In other words, the first reflective assembly 130 is configured to change both the transmission direction of the first light 101 and the polarization direction of the first light 101.

[0054] The first polarizing transflective element 120 is further configured to reflect the first light 101 reflected by the first reflective component 130 to the second polarizing transflective element 140 .

[0055] The second polarizing transflective element 140 is used to reflect the first light 101 reflected by the first polarizing transflective element 120 to the second reflective component 150 .

[0056] The second reflective assembly 150 is configured to reflect the first light 101 reflected by the second polarizing transflective element 140 back to the second polarizing transflective element 140. The polarization directions of the first light 101 received by the second reflective assembly 150 and the first light 101 reflected by the second reflective assembly 150 are perpendicular to each other. In other words, the second reflective assembly 150 is configured to change both the transmission direction of the first light 101 and the polarization direction of the first light 101. The second polarizing transflective element 140 is also configured to transmit the first light 101 reflected by the second reflective assembly 150.

[0057] In an embodiment of the present application, the first light 101 tilts and turns back a small number of times in the x-direction. For example, in FIG3a , the first light 101 tilts and turns back twice in the x-direction, thereby reducing the height of the lens module 100. In addition, the light transmitted through the first polarizing reflective element 120 passes through the first reflective assembly 130 and is then transmitted back to the first polarizing reflective element 120 to be reflected. The angle of incidence on the first polarizing reflective element 120 can be adjusted arbitrarily. On the basis of ensuring that the field of view angle remains unchanged, the tilt angle of the polarizing reflective surface of the first polarizing reflective element 120 can be adjusted to reduce the thickness of the lens module 100. Similarly, the tilt angle of the polarizing reflective surface of the second polarizing reflective element 140 can be adjusted to reduce the thickness of the lens module 100. Without reducing the field of view angle, the lens module 100 has the advantage of being small in size. The aforementioned thickness of the compressed lens module 100 is the dimension of the compressed lens module 100 along the user's normal line of sight, that is, the dimension of the lens module 100 along the x-direction.

[0058] As shown in FIG3a , for ease of description, light ray f0 is defined as the first light ray 101 emitted by the linear polarizer 110. Light ray f1 is defined as the first light ray 101 transmitted from the linear polarizer 110 by the first polarizing transflective element 120. Light ray f2 is defined as the first light ray 101 reflected by the first reflective component 130 and transmitted by the first polarizing transflective element 120. Light ray f3 is defined as the first light ray 101 reflected by the first polarizing transflective element 120 and reflected by the first reflective component 130. Light ray f4 is defined as the first light ray 101 reflected by the second polarizing transflective element 140 and reflected by the first polarizing transflective element 120. Light ray f5 is defined as the first light ray 101 reflected by the second reflective component 150 and reflected by the second polarizing transflective element 140. Light ray f6 is defined as the first light ray 101 transmitted by the second polarizing transflective element 140 and reflected by the second reflective component 150. The dotted line in FIG3a represents the transmission path of the first light ray 101.

[0059] It is understood that the aforementioned light rays f0, f1, f2, f3, f4, f5, and f6 are all first light rays 101, differing only in the way the first light rays 101 are transmitted to different locations. Light rays f0, f1, f5, and f6 all have the same polarization direction, namely, the first polarization direction. Light rays f2, f3, and f4 all have the same polarization direction, namely, the second polarization direction. The first polarization direction and the second polarization direction are perpendicular to each other.

[0060] The embodiments of the present application do not limit the first polarization direction. For example, in some embodiments, the first polarization direction is p (German: parallel) light, where the polarization of the p light is within the plane formed by the normal of the incident light. In some embodiments, the first polarization direction is s (German: senkrecht) light, where the polarization of the s light is perpendicular to the plane of incidence. The polarization direction of the s light is perpendicular to the polarization direction of the p light. Thus, the polarization direction of the linear polarizer 110 can be set according to the first polarization direction, and the embodiments of the present application do not limit this.

[0061] As described above, by adjusting the inclination angle of the reflective surface of the first polarizing transflective element 120 to change the incident angle of light f3 reflected by the first polarizing transflective element 120, the angle between light f2 and light f3 is adjusted. Alternatively, by adjusting the inclination angle of the reflective surface of the second polarizing transflective element 140 to change the incident angle of light f4 reflected by the second polarizing transflective element 140, the angle between light f4 and light f5 is adjusted. This increases the field of view angle β of the lens module 100 without changing the size of the lens module 100 along the x-direction.

[0062] Exemplarily, the first polarizing reflective element 120 is used to transmit the light f0 of the first polarization direction and reflect the light f2 of the second polarization direction. In Figure 3a, the first polarizing reflective element 120 can be a polarizing beam splitter (PBS). The polarizing beam splitter has a high transmittance to the light f0 of the first polarization direction and a low transmittance to the light f2 of the second polarization direction, which can improve the imaging quality of the imaging light. Exemplarily, the polarizing beam splitter has an optical surface s21, an optical surface s22 and an optical surface s23, wherein the optical surface s21 faces the linear polarizer 110, the optical surface s22 faces away from the linear polarizer 110, and the optical surface s23 faces the second polarizing reflective element 140. The embodiment of the present application does not limit the surface shapes of the optical surface s21, the optical surface s22 and the optical surface s23. Exemplarily, the optical surface s21, the optical surface s22 and the optical surface s23 can all be planes, spherical surfaces or aspherical surfaces.

[0063] In some embodiments, the first polarizing transflective element 120 can have other structures. Figure 4 is a schematic diagram of the structure of the first polarizing transflective element 120 provided in an embodiment of the present application. Referring to Figure 4, the first polarizing transflective element 120 includes a flat plate 121 and a polarizing reflective film 122. The flat plate 121 and the polarizing reflective film 122 are connected. The polarizing reflective film 122 is configured to transmit light f0 having a first polarization direction and also to reflect light f2 having a second polarization direction. The flat plate 121 is configured to allow light to pass through.

[0064] The present embodiment does not limit the positional relationship between the flat plate 121 and the polarizing reflective film 122. For example, the polarizing reflective film 122 can be connected to any surface of the flat plate 121. The flat plate 121 is made of a transparent material, such as glass or a light-transmitting resin, and the present embodiment does not limit this.

[0065] In an embodiment of the present application, as shown in FIG3 a , the first reflective assembly 130 receives light f1 from the first polarizing transflective element 120 and reflects light f1 to emit light f2 . The polarization directions of light f1 and light f2 are perpendicular to each other. Thus, the first reflective assembly 130 has the functions of reflecting light and changing its polarization direction.

[0066] In some embodiments, the first reflective assembly 130 may include a reflective element 131 and a quarter-wave plate (also known as a "quarter retardation plate") 132. The quarter-wave plate 132 and the reflective element 131 may be spaced apart along a side away from the first polarizing reflective element 120. In other words, the first polarizing reflective element 120, the quarter-wave plate 132, and the reflective element 131 are stacked. After the light ray f1 passes through the quarter-wave plate 132, it is reflected by the reflective element 131 and then passes through the quarter-wave plate 132 again to obtain the light ray f2. After the light ray f1 in the first polarization direction passes through the quarter-wave plate 132 twice, the polarization direction is changed to obtain the light ray f2 in the second polarization direction. The reflective element 131 can change the transmission direction of the light ray f1.

[0067] Illustratively, the reflective element 131 includes two opposing surfaces: a reflective surface s31 and a first convex surface s32. The reflective surface s31 is located on the side of the reflective element 131 facing away from the first polarizing transflective element 120, while the first convex surface s32 is projected toward the first polarizing transflective element 120. Thus, during the transmission of the first light ray within the reflective element 131, the first light ray is first reflected by the reflective surface s31 and then projected onto the quarter-wave plate 132 through the first convex surface s32. Because the first convex surface s32 is projected toward the first polarizing transflective element 120, it converges the first light ray, facilitating imaging of the first light ray and improving imaging quality.

[0068] In some embodiments, the optical axis of the first convex surface s32 and the optical axis of the reflective surface s31 are coaxial. For example, the optical axis of the first convex surface s32 and the optical axis of the reflective surface s31 can be coaxial with the optical axis of the light ray f1. The optical axis of the light ray f1 is the centerline of the light beam of the light ray f1. This creates a high degree of overlap between the optical paths of the light ray f1 and the light ray f2, reducing the dimensions of the first reflective assembly 130 and the first polarizing transflective element 120 along the z-direction. This facilitates reducing the height and volume of the lens module 100.

[0069] The method for forming the reflective surface s31 on the reflective element 131 in the embodiment of the present application is not limited. For example, the reflective surface s31 can be formed by coating or applying a reflective film. In other embodiments of the present application, the first convex surface s32 is not required, and the reflective element 131 may not have the first convex surface s32. For example, the surface of the reflective element 131 facing away from the reflective surface s31 can be flat or concave.

[0070] In some embodiments, the first reflective assembly 130 may not include the aforementioned quarter-wave plate 132. For example, a phase modulator may be used in place of the aforementioned quarter-wave plate 132. Exemplarily, the phase modulator's phase compensation for light f1 is equal to an odd integer multiple of one-quarter wavelength of light f1. The phase compensation of the phase modulator can be adjusted by adjusting the refractive index of the phase modulator's material and the thickness of the phase modulator, so that the phase modulator provides a quarter-phase compensation function for light f1. In this way, light f1 with a first polarization direction can be polarized twice by passing through the phase modulator to obtain light f2 with a second polarization direction.

[0071] In the embodiment of the present application, the structure of the second polarizing transflective element 140 refers to the description of the first polarizing transflective element 120 and is not repeated here. Correspondingly, the structure of the second reflective assembly 150 refers to the description of the first reflective assembly 130 and is not repeated here.

[0072] The embodiments of the present application do not restrict the relative positions of the second polarizing transflective element 140 and the first polarizing transflective element 120. When a user wears AR glasses, the first polarizing transflective element 120 can be located on either side of the second polarizing transflective element 140, provided that light transmitted through the second polarizing transflective element 140 can enter the user's eyes.

[0073] In some embodiments of the present application, when a user wears AR glasses, the second polarizing transflective element 140 can be located directly in front of the user's eyes. Light f6 transmitted by the second polarizing transflective element 140 enters the user's eyes. The first polarizing transflective element 120 can be located above, below, to the left, or to the right of the second polarizing transflective element 140.

[0074] In some embodiments of the present application, the lens module 100 may further include a third lens 160, which is configured to transmit the first light reflected by the first polarizing transflective element 120 to the second polarizing transflective element 140. In other words, the third lens 160 is configured to transmit the light f3 and project the light f3 to the second polarizing transflective element 140.

[0075] As shown in Figure 3a, the third lens 160 includes two opposing surfaces: a second convex surface s61 and an optical surface s62. The second convex surface s61 is the surface of the third lens 160 facing away from the first polarizing transflective element 120, while the optical surface s62 is the surface of the third lens 160 facing the first polarizing transflective element 120. The second convex surface s61 is convexly disposed away from the first polarizing transflective element 120. As a result, when light f3 passes through the second convex surface s61, the second convex surface s61 converges the light, improving the imaging quality of the first light. The present embodiment does not limit the shape of the optical surface s62; the optical surface s62 may be, for example, a plane, a spherical surface, or an aspherical surface.

[0076] It will be appreciated that in some embodiments, the third lens 160 is not necessary, and the lens module 100 may not be provided with the third lens 160. In embodiments where the lens module 100 does not include the third lens 160, the end of the first polarizing transflective element 120 facing the second polarizing transflective element 140 and the end of the second polarizing transflective element 140 facing the first polarizing transflective element 120 may be connected by an adhesive layer (e.g., an optical adhesive layer). Alternatively, a gap may be provided between the end of the first polarizing transflective element 120 facing the second polarizing transflective element 140 and the end of the second polarizing transflective element 140 facing the first polarizing transflective element 120, and the gap may be filled with a gas such as air, nitrogen, or helium.

[0077] In some embodiments of the present application, in order to improve the imaging quality of the lens module 100, the lens module 100 may include other lens structures. For example, a lens for optimizing the aberration of the light ray f2 may be disposed between the first reflective component 130 and the first polarizing transflective element 120. Alternatively, a lens for optimizing the aberration of the light ray f5 may be disposed between the second reflective component 150 and the second polarizing transflective element 140 to optimize the imaging quality of the lens module 100.

[0078] The embodiments of the present application do not limit the physical connection method of the linear polarizer 110, the first polarizing transflective element 120, the first reflective assembly 130, the second polarizing transflective element 140, the second reflective assembly 150, and the third lens 160 in the lens module 100. For example, in some embodiments, the lens module 100 further includes a bracket, and the linear polarizer 110, the first polarizing transflective element 120, the first reflective assembly 130, the second polarizing transflective element 140, the second reflective assembly 150, and the third lens 160 are all connected to the bracket. In an embodiment where the lens module 100 is integrated into AR glasses, the linear polarizer 110, the first polarizing transflective element 120, the first reflective assembly 130, the second polarizing transflective element 140, the second reflective assembly 150, and the third lens 160 can be connected to a frame or a frame.

[0079] Figure 3b is a graph showing the MTF (modulation transfer function) of the lens module 100 shown in Figure 3a. The horizontal axis represents spatial frequency, and the vertical axis represents the MTF value. The closer the MTF curve is to 1, the better the image quality of the lens module 100. Figure 3b illustrates that the image quality of the lens module 100 shown in Figure 3a is superior.

[0080] FIG5a is a schematic diagram of the structure of another lens module 100 provided in an embodiment of the present application. The differences between the lens module 100 shown in FIG5a and the lens module 100 shown in FIG3a include: the polarization state of the light transmitted by the first polarizing transflective element 120 is different, and the lens module 100 may further include a third reflective component 170.

[0081] In FIG5 a, the linear polarizer 110 emits light f7 in the second polarization direction. The lens module 100 further includes a third reflective component 170. The first polarizing transflective element 120 is configured to transmit the first light emitted by the linear polarizer 110 to the first reflective component 130, including: the first polarizing transflective element 120 is configured to reflect the first light emitted by the linear polarizer 110 to the third reflective component 170; the third reflective component 170 is configured to reflect the first light reflected by the first polarizing transflective element 120 to the first polarizing transflective element 120; and the first polarizing transflective element 120 is configured to transmit the first light reflected by the third reflective component 170 to the first reflective component 130.

[0082] In other words, the first polarizing transflective element 120 is used to reflect the first light (light f7) emitted by the linear polarizer 110 to the third reflective component 170. The light (light f7) reflected from the linear polarizer 110 by the first polarizing transflective element 120 is defined as light f8. The third reflective component 170 is used to reflect the first light (light f8) reflected by the first polarizing transflective element 120 to the first polarizing transflective element 120. The first polarizing transflective element 120 is used to transmit the first light reflected by the third reflective component 170 to the first reflective component 130. In other words, f0 is the first light (light f8) reflected by the third reflective component 170 and then reflected by the first polarizing transflective element 120. The light f7 emitted by the linear polarizer 110 is reflected by the first polarizing transflective element 120 and the third reflective component 170 to obtain the light f0. The transmission path of the light f0 within the lens module 100 is described in Figure 3a.

[0083] The provision of the third reflective assembly 170 can extend the transmission distance of the first light within the lens module 100. The third reflective assembly 170 can also shape the first light. While the optical path of the first light remains the same, the third reflective assembly 170 also reduces the divergence angle of the first light. The third reflective assembly 170 adds a reflective surface to the first light, providing it with more optical power, while also increasing the degree of freedom for optimizing aberrations and improving the imaging quality of the imaging light.

[0084] In the embodiment of the present application, the structure of the third reflective component 170 can refer to the description of the first reflective component 130 mentioned above, and will not be repeated here.

[0085] Figure 5b is an MTF curve diagram of the lens module 100 shown in Figure 5a. The horizontal axis represents spatial frequency, and the vertical axis represents MTF value. The closer the MTF curve is to 1, the better the image quality of the lens module 100. Figure 5b illustrates that the image quality of the lens module 100 shown in Figure 5a is better.

[0086] In some embodiments of the present application, in addition to receiving image light emitted by display screen 21 (as shown in FIG1b ), the user's eyes can also receive ambient light, allowing the user to observe scenes in the environment based on the ambient light. The aforementioned ambient light can be sunlight, lamplight, or light emitted by other electronic devices such as televisions. For example, in addition to viewing the image displayed on display screen 21, the user can also view street scenes, etc.

[0087] 6 is a schematic structural diagram of another lens module 100 provided in an embodiment of the present application. The difference between the lens module 100 shown in FIG6 and the lens module 100 shown in FIG3a is that the lens module 100 may further include a first lens 180.

[0088] In FIG6 , the first lens 180 is located on the side of the second reflective assembly 150 facing away from the second polarizing transflective element 140. The surface of the second reflective assembly 150 facing the first lens 180 is a first curved surface s51, and the surface of the first lens 180 facing the second reflective assembly 150 is a second curved surface s81. The first curved surface s51 and the second curved surface s81 are bonded together. The first lens 180 is configured to transmit the second light 102 to the second reflective assembly 150. The second reflective assembly 150 is also configured to transmit the second light 102 transmitted by the first lens 180. The second polarizing transflective element 140 is also configured to transmit the second light 102 transmitted by the second reflective assembly 150.

[0089] For ease of description, the second light 102 transmitted by the second reflective component 150 and the first lens 180 is defined as light h0. The second light 102 transmitted by the second polarizing transflective element 140 and the second reflective component 150 is defined as light h1. It is understood that both light h0 and light h1 are second light 102.

[0090] For example, the second polarizing transflective element 140 transmits the second light 102 transmitted by the second reflective component 150 to the user's eye. The user can then receive the second light 102 and observe the image on the side of the first lens 180 facing away from the second reflective component 150. Furthermore, the first curved surface s51 and the second curved surface s81 are aligned, and the transmission direction of the second light 102 does not change when passing through the first curved surface s51 and the second curved surface s81.

[0091] In some embodiments of the present application, the first curved surface s51 and the second curved surface s81 can be bonded by optical adhesive. The gap between the first curved surface s51 and the second curved surface s81 in FIG6 is for ease of reading and does not limit the existence of a gap between the first curved surface s51 and the second curved surface s81.

[0092] It is understood that because the second polarizing transflective element 140 is configured to transmit light having the first polarization direction, the second polarizing transflective element 140 can transmit the portion of the second light 102 having the first polarization direction. In other words, the light h1 having the first polarization direction in the light h0 passes through the second polarizing transflective element 140 and enters the user's eye.

[0093] The surface of the first lens 180 facing the second reflective assembly 150 is an optical surface s82. The present embodiment does not limit the type of the optical surface s82. For example, the optical surface s82 can be a plane, a spherical surface, or an aspherical surface, and is configured according to the perspective effect on the second light 102.

[0094] The present embodiment of the present application does not restrict the relationship between optical surface s82 and optical surface s52 of the second reflective assembly 150 that faces away from first curved surface s51. For example, optical surface s82 and optical surface s52 of the second reflective assembly 150 that faces away from first curved surface s51 may have the same surface shape. Alternatively, the surface shapes of optical surface s82 and optical surface s52 may be optimized to ensure that the second light 102 entering the user's eye is imaged clearly and without distortion.

[0095] As shown in FIG6 , in some embodiments, the lens module 100 may further include a second lens 190, which is located on the side of the second polarizing reflective element 140 facing away from the second reflective assembly 150. The second lens 190 is bonded to an optical surface s91 of the second polarizing reflective element 140 and a surface s41 of the second polarizing reflective element 140 facing the second lens 190. The second lens 190 is used to transmit the first light (light f5) and the second light 102 (light h0) that pass through the second polarizing reflective element 140. Because the optical surface s91 and the surface s41 are bonded to each other, the optical directions of the second light 102 and the first light are slightly changed when they pass through the optical surface s91 and the surface s41, thereby avoiding image distortion.

[0096] The present embodiment of the present application does not restrict the surface shape of the optical surface s92 of the second lens 190 that faces away from the second polarizing transflective element 140. For example, the optical surface s92 can be a plane, a spherical surface, or an aspherical surface. Similarly, the present embodiment of the present application does not restrict the surface shape of the optical surface s42 of the second polarizing transflective element 140 that faces away from the second lens 190. For example, the optical surface s42 can be a plane, a spherical surface, or an aspherical surface.

[0097] It is understandable that the lens module 100 shown in FIG. 5 a may also be provided with the first lens 180 and the second lens 190 shown in FIG. 6 . Similarly, the user may receive image light and ambient light (eg, the second light 102 ).

[0098] In some embodiments, to further increase the field of view, the size of the display screen 21 (as shown in FIG. 1B ) can be increased. To accommodate a larger display screen, the size of the lens module 100 can be increased. Alternatively, light from the edge of the larger display screen 21 can be transmitted via an optical waveguide, as illustrated below with reference to FIG. 7 and FIG. 8B . It is understood that the larger display screen can also be comprised of multiple displays.

[0099] FIG7 is a schematic structural diagram of another lens module 100 provided in an embodiment of the present application. The difference between the lens module 100 in FIG7 and the lens module 100 in FIG3a is that the lens module 100 may further include an optical waveguide 210 .

[0100] As shown in Figure 7, the optical waveguide 210 includes an incoupling portion 211 and an outcoupling portion 212. The outcoupling portion 212 is disposed on one side of the second polarizing transflective element 140. The linear polarizer 110 is also configured to emit the third light 103. The first polarizing transflective element 120 is configured to transmit the third light 103 emitted by the linear polarizer 110 to the incoupling portion 211. The outcoupling portion 212 is configured to outcouple the third light 103 coupled in by the incoupling portion 211. In this manner, both the first light 103 and the third light 103 can enter the user's eyes.

[0101] In addition, the third light 103 propagates in the optical waveguide 210, and the optical path of the third light 103 and the optical path of the first light 101 overlap slightly, and the third light 103 and the first light 101 hardly interfere with each other. In this way, the setting of the optical waveguide 210 has little effect on the imaging quality of the first light 101, and the field of view angle of the lens module 100 can be increased by adjusting the relative position of the decoupling portion 212 and the light-transmitting area of ​​the second polarizing reflective element 140. For example, the decoupling portion 212 is set to the outside of the edge light of the light f6 (as shown in Figure 6) emitted by the second polarizing reflective element 140, so as to increase the size of the field of view angle. Compared with the lens module 100 in Figure 3a, the field of view angle of the lens module 100 in Figure 7 in the x-direction can be increased by 0° to 30°, and the field of view angle of the lens module 100 in the z-direction can be increased by 0° to 30°.

[0102] Figure 8a is a schematic diagram of a display screen 21 and a screen being viewed by a user, according to an embodiment of the present application. In Figure 8a, display screen 21 may include a central area 22 and edge areas 21, with edge areas 21 surrounding central area 22. The embodiment of the present application does not impose any restrictions on the size ratio of edge areas 21 to central area 22, and may be adjusted based on actual needs.

[0103] The imaging light is the light emitted from the central area 22 , and the third light 103 is the light emitted from the edge area 21 and obtained after passing through the linear polarizer 110 .

[0104] After passing through the first polarization transflective element 120 , the third light 103 is transmitted through the coupling-in portion 211 in the optical waveguide 210 , and then coupled out by the coupling-out portion 212 to be projected into the user's eyes.

[0105] Since the outcoupling portion 212 is disposed at one side of the second polarizing transflective element 140 , the light coupled out by the outcoupling portion 212 is located at one side of the first light emitted from the second polarizing transflective element 140 .

[0106] For example, in FIG8a , the inner region of the display screen is the image formed by the imaging light emitted from the center region 22, and is named as image 1. The edge region of the display screen is the image formed by the light emitted from the edge region 21 (the aforementioned third light 103), and is named as image 2.

[0107] In the example of Figure 8a, screen 2 is arranged around screen 1, and a blank area may be provided between screen 2 and screen 1, where no image is displayed. Exemplarily, the decoupling portion 212 is arranged around the outer periphery of the second polarizing transflective element 140, allowing screen 2 to be arranged around screen 1. In some embodiments, the decoupling portion 212 may be arranged on one side of the second polarizing transflective element 140, positioning screen 2 to one side of screen 1. Alternatively, the decoupling portion 212 may be arranged on opposite sides of the second polarizing transflective element 140, with screen 2 being provided on opposite sides of screen 1, and so on, and will not be further described here.

[0108] Similarly, in the embodiment of the present application, the coupling portion 211 can be arranged around the first reflective component 130, or the coupling portion 211 can be arranged on one side of the first reflective component 130, or the coupling portion 211 can be arranged on two opposite sides of the first reflective component 130.

[0109] The embodiment of the present application does not limit the content displayed on screen 1 and screen 2. For example, screen 1 can display the main screen and screen 2 can display the auxiliary screen (such as prompt information). The blank area divides screen 1 and screen 2 to facilitate users to quickly obtain various information.

[0110] It is understood that in some embodiments of the present application, the aforementioned blank area may not be provided. Furthermore, in some embodiments of the present application, the third light 103 and the imaging light may originate from different display screens 21. Alternatively, the third light 103 may not originate from the display screen 21; for example, the third light 103 may originate from another light source, such as a warning light.

[0111] In an embodiment where the first reflective assembly 130 includes a reflective element 131 and a quarter-wave plate 132, the third light 103 transmitted by the first polarizing transflective element 120 can pass through the quarter-wave plate 132 and then enter the optical waveguide 210 through the coupling portion 211. Alternatively, the third light 103 transmitted by the first polarizing transflective element 120 can enter the optical waveguide 210 through the coupling portion 211 without passing through the quarter-wave plate 132. The size of the quarter-wave plate 132 can be adjusted, and this embodiment of the present application does not impose any limitation thereto.

[0112] In the embodiment of FIG7 , the first reflective assembly 130 and the second polarizing transflective element 140 are both connected to the optical waveguide 210. This fixes the relative positions of the first reflective assembly 130, the second polarizing transflective element 140, and the optical waveguide 210, reducing degrees of freedom, thereby improving assembly accuracy and reducing assembly costs. For example, the first reflective assembly 130 can be connected to the optical waveguide 210 via an adhesive layer, and the second polarizing transflective element 140 can be connected to the optical waveguide 210 via an adhesive layer.

[0113] The present embodiment does not limit the structure of the optical waveguide 210. For example, the optical waveguide 210 may be a grating, or a prism, or an optical fiber.

[0114] Likewise, in other embodiments of the present application, the third light 103 may not pass through the linear polarizer 110 .

[0115] Figure 8b is a schematic diagram of the structure of another lens module 100 provided in an embodiment of the present application. Figure 8b differs from Figure 7 in that the source of the third light 103 is different. In the example of Figure 8b , the lens module 100 further includes a secondary display screen 201 configured to emit the third light 103, and a coupling portion 211 configured to couple the third light 103 emitted from the secondary display screen 201.

[0116] 8b, the third light 103 may not pass through the linear polarizer 110, the first polarizing transflective element 120, and the first reflective assembly 130. Therefore, the third light 103 entering the user's eyes is fully polarized light, and the utilization rate of the third light 103 is high.

[0117] In the embodiment of FIG8b , the secondary display screen 201 and the linear polarizer 110 are located on opposite sides of the light waveguide 210. In other embodiments, the secondary display screen 201, the linear polarizer 110, and the light waveguide 210 may be positioned in other relative positions, as long as the secondary display screen 201 does not affect the imaging of the first light 101.

[0118] It is understandable that the lens module 100 shown in FIG. 5 a and the lens module 100 shown in FIG. 6 may also include the optical waveguide 210 described in the examples of FIG. 7 or FIG. 8 b .

[0119] 3a, 5a, 6 and 7, the optical axis of the first reflective component 130, the optical axis of the first polarizing transflective element 120 and the optical axis of the second polarizing transflective element 140 are coplanar.

[0120] 3a, 5a, 6, and 7, the normal to the reflective surface of the first polarizing transflective element 120, the normal to the reflective surface of the second polarizing transflective element 140, and the optical axis of the first reflective assembly 130 are coplanar. For example, in the examples of Figures 3a, 5a, 6, and 7, the normal to the reflective surface of the first polarizing transflective element 120, the normal to the reflective surface of the second polarizing transflective element 140, and the optical axis of the first reflective assembly 130 are all parallel to the paper.

[0121] The normal to the reflective surface of the first polarizing transflective element 120 is a line perpendicular to the reflective surface of the first polarizing transflective element 120 used to reflect the light f2 reflected by the first reflective assembly 130. Similarly, the normal to the reflective surface of the second polarizing transflective element 140 is a line perpendicular to the reflective surface of the second polarizing transflective element 140 used to reflect the light f3 reflected by the first polarizing transflective element 120. The optical axis of the first reflective assembly 130 is the optical axis of the reflective surface of the first reflective assembly 130 used to reflect the light f1 that passed through the first polarizing transflective element 120.

[0122] In some embodiments of the present application, the relative positional relationship among the optical axis of the first reflective assembly 130 , the optical axis of the first polarizing transflective element 120 , and the optical axis of the second polarizing transflective element 140 may be set according to space requirements.

[0123] Fig. 9 is a schematic structural diagram of another lens module 100 provided in an embodiment of the present application. The difference between the lens module 100 in Fig. 9 and the lens module 100 in Fig. 3a includes that the first polarizing transflective element 120 and the first reflective assembly 130 are installed in different positions.

[0124] In the example of Figure 9, the normal of the reflective surface of the first polarizing reflective element 120 and the normal of the reflective surface of the second polarizing reflective element 140 are not coplanar. Then, the optical axis of the first light after being reflected by the reflective surface of the first polarizing reflective element 120 is not coplanar with the optical axis of the first light after being reflected by the first reflective component 130. In this way, during the transmission of the first light in the lens module 100 shown in Figure 9, the first light is transmitted in multiple directions. For example, it is transmitted in the x-direction, the y-direction and the z-direction. The dimensions of the lens module 100 along the x-direction, the y-direction and the z-direction can be changed. For example, the dimension of the lens module 100 along the y-direction can be extended to reduce the dimension of the lens module 100 along the x-direction, and the thickness of the lens module 100 can be reduced as needed.

[0125] In FIG9 , the normal line of the reflective surface of the first polarizing transflective element 120 is k1 , and the normal line of the reflective surface of the second polarizing transflective element 140 is k2 . k1 and k2 are not coplanar.

[0126] In some embodiments, the normal k1 of the reflective surface of the first polarizing transflective element 120 is perpendicular to the reference surface c-plane. The reference surface c-plane is the plane containing the optical axis of the second reflective assembly 150 and the normal k2 of the reflective surface of the second polarizing transflective element 140. In other words, the plane containing the optical axis of the second reflective assembly 150 and the normal k2 of the reflective surface of the second polarizing transflective element 140 is defined as the reference surface c-plane. The normal k1 of the reflective surface of the first polarizing transflective element 120 is perpendicular to the reference surface c-plane. This shortens the distance traveled by the first light ray in the x-direction, further reducing the x-direction dimensions of the lens module 100.

[0127] Illustratively, the normal k1 of the reflective surface of the first polarizing transflective element 120 being perpendicular to the reference plane c includes: the angle between the normal k1 of the reflective surface of the first polarizing transflective element 120 and the reference plane c is 60° to 120°. For example, the angle between the optical axis of the first reflective assembly 130 and the reference plane c can be 60°, 65°, 70°, 75°, 80°, 83°, 86°, 88°, 89°, 90°, 91°, 92°, 93°, 95°, 97°, 100°, 110°, 115°, or 120°, etc.

[0128] It is understandable that in other embodiments, the angle between the normal k1 of the reflecting surface of the first polarizing reflective element 120 and the reference surface c is not limited to the above range and can be set according to the size requirements of the lens module 100 along the x-direction, y-direction and z-direction.

[0129] Similarly, in the examples of Figures 5a, 6 and 7, the relationship between the normal of the reflective surface of the first polarizing reflective element 120 and the normal of the reflective surface of the second polarizing reflective element 140 can also be set to the relationship shown in Figure 9. The size of the lens module 100 along various directions can also be adjusted, which will not be repeated here.

[0130] The above is only a specific embodiment of the present application, but the scope of protection of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A lens module, characterized in that: The lens module comprises: A linear polarizer, used for emitting the first light; A first polarization transflective element, used for transmitting the first light emitted from the linear polarizer to a first reflective component; The first reflection component is used to reflect the first light transmitted by the first polarization transflective element to the first polarization transflective element; the polarization directions of the first light received by the first reflection component and the first light reflected by the first reflection component are perpendicular to each other; The first polarizing transflective element is further used to reflect the first light reflected by the first reflecting component to the second polarizing transflective element; The second polarizing transflective element is used to reflect the first light reflected by the first polarizing transflective element; The second reflecting component is used to reflect the first light reflected by the second polarizing transflective element to the second polarizing transflective element; wherein the polarization directions of the first light received by the second reflecting component and the first light reflected by the second reflecting component are perpendicular to each other; The second polarizing reflective element is further used to transmit the first light reflected by the second reflective component.

2. The lens module according to claim 1, characterized in that: The lens module further includes: a first lens, the first lens is located on a side of the second reflective component away from the second polarized reflective element, the surface of the second reflective component facing the first lens is a first curved surface, the surface of the first lens facing the second reflective component is a second curved surface, and the first curved surface is bonded to the second curved surface; The first lens is used to transmit the second light to the second reflective component, the second reflective component is also used to transmit the second light transmitted by the first lens, and the second polarizing reflective element is also used to transmit the second light transmitted by the second reflective element.

3. The lens module according to claim 2, characterized in that: The lens module also includes: a second lens; the second lens is located on a side of the second polarizing reflective element away from the second reflective component, and a surface of the second lens facing the first polarizing reflective element is bonded to a surface of the first polarizing reflective element facing the second lens.

4. The lens module according to any one of claims 1 to 3, characterized in that: The first reflection component comprises: a reflective element and a quarter wave plate; the quarter wave plate is located on a side of the reflective element facing the first polarization transflective element.

5. The lens module according to claim 4, characterized in that: The reflective element comprises a reflective surface and a first convex surface which are arranged opposite to each other. The reflective surface is located at a side of the reflective element which is away from the first polarizing transflective element, and the first convex surface is arranged to protrude toward the first polarizing transflective element.

6. The lens module according to claim 5, characterized in that: The optical axis of the reflective surface is coaxial with the optical axis of the first convex surface.

7. The lens module according to any one of claims 1 to 6, characterized in that: The normal line of the reflection surface of the first polarizing transflective element, the normal line of the reflection surface of the second polarizing transflective element, and the optical axis of the first reflection component are not coplanar.

8. The lens module according to claim 7, characterized in that: The normal line of the reflection surface of the first polarizing transflective element is perpendicular to a reference plane, and the reference plane is a plane where the optical axis of the second reflection component and the normal line of the reflection surface of the second polarizing transflective element are located.

9. The lens module according to any one of claims 1 to 8, characterized in that: The lens module further comprises: an optical waveguide, the optical waveguide comprising a coupling-in portion and a coupling-out portion, the coupling-out portion being arranged on a side of the second polarizing transflective element away from the second reflective component; The linear polarizer is further used for emitting a third light ray, the first polarization transflective element is further used for transmitting the third light ray to the coupling-in portion, and the coupling-out portion is used for coupling out the third light ray coupled in by the coupling-in portion.

10. The lens module according to claim 9, characterized in that: The first reflection component and the second polarization transflective element are both connected to the optical waveguide.

11. The lens module according to any one of claims 1 to 10, characterized in that: The lens module further includes: a third lens, used for transmitting the first light reflected by the first polarizing transflective element to the second polarizing transflective element; The surface of the third lens facing away from the first polarization transflective element is a second convex surface, and the second convex surface is convexly arranged away from the first polarization transflective element.

12. The lens module according to any one of claims 1 to 11, characterized in that: The lens module further includes: a third reflection component; The first polarization reflective element is used to transmit the first light emitted by the linear polarizer to the first reflective component, and includes: The first polarizing reflective element is used to reflect the first light emitted from the linear polarizer to the third reflecting component, the third reflecting component is used to reflect the first light reflected by the first polarizing reflective element to the first polarizing reflective element, and the first polarizing reflective element is used to transmit the first light reflected by the third reflecting component to the first reflecting component, wherein the polarization directions of the first light received by the third reflecting component and the first light reflected by the third reflecting component are perpendicular to each other.

13. The lens module according to any one of claims 1 to 12, characterized in that: The first polarization transflective element comprises a polarization beam splitter prism; Alternatively, the first polarization transflective element includes a connected flat plate and a polarization reflective film.

14. A display device, characterized in that: The display device comprises: a display screen and the lens module according to any one of claims 1 to 13; the display screen is used to generate imaging light containing image information; and project the imaging light onto the first polarizer.

15. An augmented reality device, characterized in that: The augmented reality device comprises: a processor and the display device according to claim 14, wherein the processor is used to send image data to the display device.

Images