Lens module, display device and augmented reality display equipment

Abstract

The embodiment of the invention discloses a lens module, a display device and augmented reality display equipment, and relates to the field of optical structures. The problem that a lens module is large in size is solved. According to the specific scheme, the lens module comprises a linear polarizer, a first polarization transflective part, a first reflection assembly, a second polarization transflective part and a second reflection assembly. The first light is reflected once by the first polarization transflective part, the first reflection assembly, the second polarization transflective part and the second reflection assembly before entering the eyes of the user, so that the first light is transmitted to the eyes of the user after being returned for multiple times. The incident angle of the first light can be adjusted to reduce the size of the lens module.

Description

Technical Field

[0001] 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

[0002] 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 on the real scene in the outside world that can be directly seen by the human eye, so that the human eye can view the image information combining the virtual scene and the real scene in the outside world.

[0003] With the marketization of augmented reality devices, the requirements of users for augmented reality devices have also increased accordingly. For example, it is required that augmented reality devices have advantages such as small volume and convenient portability. Therefore, reducing the volume of augmented reality devices has become an urgent problem to be solved. Summary of the Invention

[0004] The present application provides a lens module, a display device, and an augmented reality display device, which are used to improve the problem of the relatively large volume of the lens module.

[0005] To achieve the above object, the present application adopts the following technical solutions.

[0006] In a first aspect, an embodiment of the present application provides a lens module. The lens module includes a linear polarizer, a first polarization transmissive and reflective element, a first reflection assembly, a second polarization transmissive and reflective element, and a second reflection assembly. The linear polarizer is configured to emit a first light ray. The first polarization transmissive and reflective element is configured to transmit the first light ray emitted by the linear polarizer to the first reflection assembly. The first reflection assembly is configured to reflect the first light ray transmitted by the first polarization transmissive and reflective element back to the first polarization transmissive and reflective element. The polarization directions of the first light ray received by the first reflection assembly and the first light ray reflected by the first reflection assembly are perpendicular to each other. The first polarization transmissive and reflective element is further configured to reflect the first light ray reflected by the first reflection assembly to the second polarization transmissive and reflective element. The second polarization transmissive and reflective element is configured to reflect the first light ray reflected by the first polarization transmissive and reflective element. The second reflection assembly is configured to reflect the first light ray reflected by the second polarization transmissive and reflective element back to the second polarization transmissive and reflective element. The polarization directions of the first light ray received by the second reflection assembly and the first light ray reflected by the second reflection assembly are perpendicular to each other. The second polarization transmissive and reflective element is further configured to transmit the first light ray reflected by the second reflection assembly. The first light ray transmitted by the second polarization transmissive and reflective element can enter the user's eye. The first light ray is reflected once by each of the first polarization transmissive and reflective element, the first reflection assembly, the second polarization transmissive and reflective element, and the second reflection assembly before entering the user's eye, causing the first light ray to turn back. During the process of the first reflection assembly reflecting the first light ray to the first polarization transmissive and reflective element, and during the process of the second reflection assembly reflecting the first light ray to the second polarization transmissive and reflective element, the propagation direction of the first light ray is not restricted. In this way, the path of the first light ray turning back between the first reflection assembly and the first polarization transmissive and reflective element can be adjusted, so that the path of the first light ray highly overlaps during the turning-back process, thereby reducing the thickness of the lens module.

[0007] In combination with the first aspect, in some realizable ways, the lens module further includes: a first lens. The first lens is located on a side of the second reflection assembly away from the second polarization transmissive and reflective element. The surface of the second reflection assembly facing the first lens is a first curved surface, and the surface of the first lens facing the second reflection assembly is a second curved surface. The first curved surface is attached to the second curved surface. The first lens is configured to transmit a second light ray to the second reflection assembly, and the second reflection assembly is further configured to transmit the second light ray transmitted by the first lens. The second polarization transmissive and reflective element is further configured to transmit the second light ray transmitted by the second reflection element. Thus, the second light ray transmitted by the second polarization transmissive and reflective element through the second reflection assembly can be transmitted to the user's eye, and the user can receive the second light ray to view the image on the side of the first lens away from the second reflection assembly. In addition, since the first curved surface is attached to the second curved surface, the transmission direction of the second light ray does not change when passing through the first curved surface and the second curved surface.

[0008] In combination with the first aspect, in some implementable ways, the lens module further includes: a second lens. The second lens is located on a side of the second polarization beam splitter that faces away from the second reflection component, and a surface of the second lens facing the first polarization beam splitter is attached to a surface of the first polarization beam splitter facing the second lens. Thus, the second lens is used to transmit the first light ray and the second light ray transmitted through the second polarization beam splitter. Since the surface of the second lens facing the first polarization beam splitter is attached to the surface of the first polarization beam splitter facing the second lens, the optical directions of the second light ray and the first light ray do not change when passing through the optical surface and the surface.

[0009] In combination with the first aspect, in some implementable ways, the first reflection component 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 polarization beam splitter. Thus, the first light ray with the first polarization direction has its polarization direction changed after passing through the quarter-wave plate twice to obtain the first light ray with the second polarization direction. The reflective element can change the transmission direction of the first light ray.

[0010] In combination with the first aspect, in some implementable ways, the reflective element includes a reflective surface and a first convex surface that are oppositely arranged. The reflective surface is located on a side of the reflective element facing away from the first polarization beam splitter, and the first convex surface protrudes toward the first polarization beam splitter. Thus, during the transmission of the first light ray within the reflective element, the first light ray is first reflected by the reflective surface and then projected through the first convex surface onto the quarter-wave plate. Since the first convex surface protrudes toward the first polarization beam splitter, the first convex surface has a converging effect on the first light ray, which is beneficial for the imaging of the first light ray and improves the imaging quality.

[0011] In combination with the first aspect, in some implementable ways, the optical axis of the reflective surface is coaxial with the optical axis of the first convex surface. In this way, the optical path overlap of the first light ray received by the first reflection component and the first light ray reflected by the first reflection component is high, and the height of the first reflection component and the first polarization beam splitter can be reduced. This is beneficial for reducing the volume of the lens module.

[0012] In combination with the first aspect, in some implementable ways, the normal of the reflective surface of the first polarization beam splitter, the normal of the reflective surface of the second polarization beam splitter, and the optical axis of the first reflection component are not coplanar. Thus, during the transmission of the first light ray within the lens module, the optical axes of the first light ray are not coplanar, and the dimensions of the lens module in multiple directions can be adjusted. For example, the dimensions of the lens module in the thickness, height, and width directions can be adjusted so that the lens module can have various shapes to choose from.

[0013] In combination with the first aspect, in some implementable ways, the normal of the reflective surface of the first polarization beam splitter is perpendicular to the reference plane, and the reference plane is the plane where the optical axis of the second reflective component and the normal of the reflective surface of the second polarization beam splitter are located. Thus, the first light ray propagates more compactly and has a shorter path within the lens module, and the volume of the lens module is further reduced.

[0014] In combination with the first aspect, in some implementable ways, the lens module further includes: an optical waveguide. The optical waveguide includes an input coupling portion and an output coupling portion, and the output coupling portion is disposed on a side of the second polarization beam splitter away from the second reflective component. The linear polarizer is further configured to emit a third light ray, and the first polarization beam splitter is further configured to transmit the third light ray to the input coupling portion, and the output coupling portion is configured to couple out the third light ray coupled into by the input coupling portion. The optical waveguide can couple out the third light ray to one side of the second polarization beam splitter, which can further increase the field of view angle of the lens module.

[0015] In combination with the first aspect, in some implementable ways, both the first reflective component and the second polarization beam splitter are connected to the optical waveguide. In this way, the degree of freedom of the optical waveguide is reduced, the assembly process is simplified, and the assembly cost is reduced.

[0016] In combination with the first aspect, in some implementable ways, the lens module further includes: a third lens. It is configured to transmit the first light ray reflected by the first polarization beam splitter to the second polarization beam splitter. The surface of the third lens facing away from the first polarization beam splitter is a second convex surface, and the second convex surface protrudes away from the first polarization beam splitter. The second convex surface has the effect of converging light rays, which can eliminate the aberration of the first light ray and improve the imaging quality.

[0017] In combination with the first aspect, in some implementable ways, the lens module further includes: a third reflective component. The first polarization beam splitter is configured to transmit the first light ray emitted by the linear polarizer to the first reflective component, including: the first polarization beam splitter is configured to reflect the first light ray emitted by the linear polarizer to the third reflective component, the third reflective component is configured to reflect the first light ray reflected by the first polarization beam splitter to the first polarization beam splitter, and the first polarization beam splitter is configured to transmit the first light ray reflected by the third reflective component to the first reflective component, wherein the polarization directions of the first light ray received by the third reflective component and the first light ray reflected by the third reflective component are perpendicular to each other. Thus, the third reflective component increases the propagation distance of the first light ray in the medium. When the optical path of the first light ray is the same, the divergence angle of the first light ray is reduced. The third reflective component adds a reflective surface to the first light ray, provides more optical power for the first light ray, and at the same time increases the degree of freedom for optimizing aberration, further optimizing the imaging quality of the first light ray.

[0018] In combination with the first aspect, in some implementable ways, the first polarization transmissive-reflective element includes a polarization beam splitter prism. Alternatively, the first polarization transmissive-reflective element includes a connected flat plate and a polarization reflective film. Thus, both of the foregoing two first polarization transmissive-reflective elements can transmit light in the first polarization direction and reflect light in the second polarization direction, and the first polarization direction and the second polarization direction are perpendicular.

[0019] In a second aspect, an embodiment of the present application provides a display device. The display device includes: a display screen and any one of the lens modules provided in the first aspect above. The display screen is configured to generate imaging light containing image information; and project the imaging light onto the first polarizer. Since the above lens module has the advantages of high integration and small volume. Obviously, the display device including the lens module also has the advantages of high integration and small volume.

[0020] In a third aspect, an embodiment of the present application provides an augmented reality device. The augmented reality device includes: a processor and any one of the display devices provided in the second aspect above, and the processor is configured to send image data to the display device. Since the volume of the display device is small, the volume of the augmented reality device is also correspondingly small, which is convenient for carrying. Description of the Drawings

[0021] Figure 1a It is a schematic structural diagram of an AR glasses.

[0022] Figure 1b It is a schematic structural diagram of an augmented reality device.

[0023] Figure 2 It is a schematic diagram of the structure of a display module in the related art.

[0024] Figure 3a It is a schematic structural diagram of the lens module provided by the embodiment of the present application.

[0025] Figure 3b For Figure 3a The MTF (modulation transfer function) curve graph of the lens module shown.

[0026] Figure 4 It is a schematic structural diagram of another first polarization transmissive-reflective element provided by the embodiment of the present application.

[0027] Figure 5a It is a schematic structural diagram of yet another lens module provided by the embodiment of the present application.

[0028] Figure 5b For Figure 5a The MTF curve graph of the lens module shown.

[0029] Figure 6It is a schematic structural diagram of another lens module provided by an embodiment of the present application.

[0030] Figure 7 It is a schematic structural diagram of yet another lens module provided by an embodiment of the present application.

[0031] Figure 8a It is a schematic diagram of a display screen and a picture viewed by a user provided by an embodiment of the present application.

[0032] Figure 8b It is a schematic structural diagram of another lens module provided by an embodiment of the present application.

[0033] Figure 9 It is a schematic structural diagram of still another lens module provided by an embodiment of the present application.

[0034] In the figure: 10 - augmented reality device; 100 - lens module; 001 - display module; 002 - screen; 003 - lens; 004 - mirror; 005 - flat glass; 006 - polarization reflection layer; 007 - quarter-wave plate; 11 - processor; 21 - display screen; 20 - display device; 110 - linear polarizer; 120 - first polarization transmissive-reflective element; 130 - first reflection component; 140 - second polarization transmissive-reflective element; 150 - second reflection component; 101 - first light ray; 121 - flat plate; 122 - polarization reflection film; 131 - reflective element; 132 - quarter-wave plate; 160 - third lens; 170 - third reflection component; 180 - first lens; 101 - first light ray; 102 - second light ray; 103 - third light ray; 190 - second lens; 210 - optical waveguide; 211 - coupling-in part; 212 - coupling-out part; 21 - edge area; 22 - central area; 201 - secondary display screen. Detailed implementation manners

[0035] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0036] Hereinafter, terms such as "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0037] In addition, in the present application, orientation terms such as "upper" and "lower" are defined relative to the orientation of the components shown in the drawings. It should be understood that these directional terms are relative concepts, and they are used for relative description and clarification, and they may change accordingly with the change of the orientation of the components placed in the drawings.

[0038] The display device provided by the embodiments 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 an AR helmet. Figure 1a For a schematic structural diagram of an AR glasses, please refer to Figure 1a , the augmented reality device 10 is integrated on the AR glasses. The user can wear the AR glasses device to play games, watch videos, participate in virtual meetings, or do video shopping, etc. It can be understood that the display device provided by the present application can also be applied to other possible scenarios, such as medical devices, and the embodiments of the present application do not make limitations.

[0039] Figure 1b For a schematic structural diagram of an augmented reality device 10. Please refer to Figure 1b , 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 used to send image data to the display device 20. Exemplarily, the augmented reality device 10 may include one or more processors 11, and the processor 11 may be, for example, a graphics processing unit (GPU).

[0040] Figure 1b In, 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 used to receive the image data sent by the processor 11 and generate imaging light containing image information according to the image data, and project the imaging light to the lens module 100. After the imaging light is imaged by the lens module 100, it enters the user's eyes.

[0041] The embodiments of the present application do not limit the type of the display screen 21. Exemplarily, the display screen 21 may include a liquid crystal display (LCD) panel, a light emitting diode (LED) display panel, or an organic light-emitting diode (OLED) display panel, etc.

[0042] In an embodiment where the display device 20 is integrated into the AR glasses, the display device 20 is disposed on the spectacle frame, and the processor 11 may be disposed on the temple or the spectacle frame. The embodiments of the present application do not limit this. Additionally, two display devices 20 may be provided on the AR glasses. One display device 20 is integrated into the left spectacle frame, and the imaging light projected by this display device 20 enters the user's left eye. The other display device 20 is integrated into the right spectacle frame, and the imaging light projected by this display device 20 enters the user's right eye. Alternatively, in other embodiments, the AR glasses may be provided with only one display device 20. The embodiments of the present application do not limit this.

[0043] For ease of description, when the user uses the display device 20, the direction of the user's line of sight when viewing the display device 20 is defined as the x direction. Taking the AR glasses as an example, the x direction is the thickness direction of the glasses. The length direction of the spectacle frame is defined as the y direction, and the height direction of the spectacle frame is defined as the z direction (as Figure 3a shown), and the x direction, y direction, and z direction are perpendicular to each other in pairs. Figure 1b In [reference], the size of the display device 20 directly affects the volume of the AR glasses.

[0044] Figure 2 It is a schematic diagram of the structure of the display module 001 in the related art. Please refer to Figure 2 , the display module 001 includes a screen 002, a lens 003, a mirror 004, a flat glass 005, a polarization reflection layer 006, and a quarter-wave retarder 007. The flat glass 005 and the polarization reflection layer 006 are bonded. Among them, the image light emitted by the screen 002 is projected onto the polarization reflection layer 006 after passing through the lens 003. The polarization reflection layer 006 reflects the light rays in the first polarization direction in the imaging light, then passes through the quarter-wave retarder 007 and is projected onto the polarization reflection layer 006. After being reflected by the polarization reflection layer 006, it passes through the quarter-wave retarder 007 again. Passing through the quarter-wave retarder 007 twice makes the polarization direction of the light perpendicular to the first polarization direction. The light passing through the quarter-wave retarder 007 again passes through the flat glass 005 and then enters the user's eyes.

[0045] Figure 2In this case, the distance between the mirror 004 and the polarization reflection layer 006 in the x direction is directly related to the field of view (FOV) α. Here, the field of view refers to the angle between the line connecting the light rays emitted from the edge of the display and the observation point (such as the user's eyes). To increase the field of view α, in order to avoid interference between the mirror 004 and the polarization reflection layer 006, it is necessary to increase the distance between the mirror 004 and the polarization reflection layer 006 in the x direction, which will obviously lead to an increase in the size of the display module 001. Or, to increase the field of view α, the flat glass 005 can be rotated clockwise. In order to avoid interference between the flat glass 005 and the lens 003, it is also necessary to increase the distance between the flat glass 005 and the lens 003 in the x direction, which will also lead to an increase in the size of the display module 001.

[0046] Therefore, the display device 20 provided by the embodiments of the present application can take into account the advantages of a large field of view and a small size.

[0047] Figure 3a It is a schematic structural diagram of the lens module 100 provided by the embodiments of the present application. Please refer to Figure 3a The lens module 100 includes a linear polarizer 110, a first polarization transmissive-reflective element 120, a first reflection assembly 130, a second polarization transmissive-reflective element 140, and a second reflection assembly 150.

[0048] Among them, the linear polarizer 110 is used to emit a first light ray 101, and the polarization direction of the first light ray 101 is the first polarization direction. For example, the imaging light emitted by the display screen 21 (as Figure 1b shown) forms linearly polarized light with a polarization direction of the first polarization direction after passing through the linear polarizer 110.

[0049] In use, the first light ray 101 enters the user's eyes after passing through the first polarization transmissive-reflective element 120, the first reflection assembly 130, the first polarization transmissive-reflective element 120, the second polarization transmissive-reflective element 140, the second reflection assembly 150, and the second polarization transmissive-reflective element 140 in sequence.

[0050] Figure 3a In, the field of view of the lens module 100 in the z direction is β, and β is the angle between the marginal light ray that passes through the edge of the second polarization transmissive-reflective element 140 and enters the user's eyes and the line connecting to the user's eyes.

[0051] The first polarizing transflective element 120 is used to transmit the first light 101 from the linear polarizer 110. The first reflecting component 130 is used to reflect the first light 101 transmitted by the first polarizing transflective element 120 to the first polarizing transflective element 120. The polarization directions of the first light 101 received by the first reflecting component 130 and the first light 101 reflected by the first reflecting component 130 are perpendicular to each other. In other words, the first reflecting component 130 is used to change the transmission direction of the first light 101 and also to change the polarization direction of the first light 101.

[0052] The first polarizing transflective element 120 is further used to reflect the first light 101 reflected by the first reflective component 130 to the second polarizing transflective element 140 .

[0053] 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 .

[0054] The second reflective component 150 is used to reflect the first light 101 reflected by the second polarized reflective element 140 to the second polarized reflective element 140. The polarization directions of the first light 101 received by the second reflective component 150 and the first light 101 reflected by the second reflective component 150 are perpendicular to each other. In other words, the second reflective component 150 is used to change the transmission direction of the first light 101 and also to change the polarization direction of the first light 101. The second polarized reflective element 140 is also used to transmit the first light 101 reflected by the second reflective component 150.

[0055] In the embodiment of the present application, the first light 101 has a small number of tilted returns in the x direction, for example Figure 3a In the figure, the first light 101 is tilted and turned back twice in the x-direction, thereby reducing the height of the lens module 100. In addition, the light transmitted through the first polarized reflective element 120 is transmitted to the first polarized reflective element 120 again after passing through the first reflective component 130 to be reflected, and the incident angle to the first polarized reflective element 120 can be adjusted arbitrarily. On the basis of ensuring that the field of view angle remains unchanged, the inclination angle of the polarized reflection surface of the first polarized reflective element 120 can be adjusted to compress the thickness of the lens module 100. Similarly, the inclination angle of the polarized reflection surface of the second polarized reflective element 140 can be adjusted to compress the thickness of the lens module 100. Without reducing the field of view angle, the lens module 100 has the advantage of a small volume. The thickness of the aforementioned 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.

[0056] like Figure 3aAs shown, for ease of description, define the light ray f0 as the first light ray 101 emitted from the linear polarizer 110. Define the light ray f1 as the first light ray 101 transmitted by the first polarization beam splitter 120 from the linear polarizer 110. Define the light ray f2 as the first light ray 101 reflected by the first reflection component 130 and transmitted by the first polarization beam splitter 120. Define the light ray f3 as the first light ray 101 reflected by the first polarization beam splitter 120 and reflected by the first reflection component 130. Define the light ray f4 as the first light ray 101 reflected by the second polarization beam splitter 140 and reflected by the first polarization beam splitter 120. Define the light ray f5 as the first light ray 101 reflected by the second reflection component 150 and reflected by the second polarization beam splitter 140. Define the light ray f6 as the first light ray 101 transmitted by the second polarization beam splitter 140 and reflected by the second reflection component 150. Figure 3a The dashed line in the figure is the transmission path of the first light ray 101.

[0057] It can be understood that the aforementioned light rays f0, f1, f2, f3, f4, f5, and f6 are all the first light ray 101, and the difference lies in the light rays when the first light ray 101 is transmitted to different positions. Among them, the polarization directions of the light rays f0, f1, f5, and f6 are the same, all being the first polarization direction. The polarization directions of the light rays f2, f3, and f4 are the same, all being the second polarization direction. The first polarization direction and the second polarization direction are perpendicular to each other.

[0058] The embodiments of the present application do not limit the first polarization direction. Exemplarily, in some embodiments, the first polarization direction is p (German: parallel) light, and the polarization of p light is in the plane formed by the incident light ray and the normal line. In some embodiments, the first polarization direction is s (German: senkrecht) light, and the polarization of s light is perpendicular to the incident plane. Among them, the polarization direction of s light is perpendicular to the polarization direction of 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.

[0059] As mentioned above, by adjusting the inclination angle of the reflection surface of the first polarization beam splitter 120 to change the incident angle of the light ray f3 reflected by the first polarization beam splitter 120, the included angle between the light rays f2 and f3 can be adjusted. Or, by adjusting the inclination angle of the reflection surface of the second polarization beam splitter 140 to change the incident angle of the light ray f4 reflected by the second polarization beam splitter 140, the included angle between the light rays f4 and f5 can be adjusted. Thus, the field of view angle β of the lens module 100 can be increased without changing the size of the lens module 100 along the x direction.

[0060] Exemplarily, the first polarization beam splitter 120 is used to transmit the light ray f0 with the first polarization direction and reflect the light ray f2 with the second polarization direction. Figure 3aAmong them, the first polarization transmissive-reflective element 120 may be a polarizing beamsplitter (PBS). The polarizing beamsplitter has a relatively high transmittance for the f0 light in the first polarization direction and a relatively low transmittance for the f2 light in the second polarization direction, which can improve the imaging quality of the imaging light. Exemplarily, the polarizing beamsplitter has an optical surface s21, an optical surface s22, and an optical surface s23. Among them, 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 polarization transmissive-reflective element 140. In the embodiments of the present application, the surface types of the optical surface s21, the optical surface s22, and the optical surface s23 are not limited. Exemplarily, the optical surface s21, the optical surface s22, and the optical surface s23 may all be flat surfaces, spherical surfaces, or aspherical surfaces, etc.

[0061] In some embodiments, the first polarization transmissive-reflective element 120 may have other structures. Figure 4 This is a schematic structural diagram of another first polarization transmissive-reflective element 120 provided by the embodiments of the present application. Please refer to Figure 4 , the first polarization transmissive-reflective element 120 includes a flat plate 121 and a polarization reflective film 122. The flat plate 121 and the polarization reflective film 122 are connected. The polarization reflective film 122 is used to transmit the light f0 in the first polarization direction, and the polarization reflective film 122 is also used to reflect the light f2 in the second polarization direction. The flat plate 121 is used for the light to pass through.

[0062] In the embodiments of the present application, the positional relationship between the flat plate 121 and the polarization reflective film 122 is not limited. For example, the polarization reflective film 122 is connected to any surface of the flat plate 121. The material of the flat plate 121 is a transparent material. The transparent material may include, for example, glass or light-transmitting resin, etc. The embodiments of the present application do not limit this.

[0063] In the embodiments of the present application, as Figure 3a shown, the first reflection component 130 receives the light f1 from the first polarization transmissive-reflective element 120 and reflects the light f1 to emit the light f2. The polarization directions of the light f1 and the light f2 are perpendicular to each other. Thus, the first reflection component 130 has the functions of reflecting light and changing the polarization direction of light.

[0064] In some embodiments, the first reflection component 130 may include a reflective element 131 and a quarter-wave plate (also known as a "quarter-wave retarder") 132. The quarter-wave plate 132 and the reflective element 131 may be spaced apart on a side facing away from the first polarization beam splitter 120. In other words, the first polarization beam splitter 120, the quarter-wave plate 132, and the reflective element 131 are stacked. The light ray f1 passes through the quarter-wave plate 132 and is reflected by the reflective element 131 and then passes through the quarter-wave plate 132 again to obtain the light ray f2. The polarization direction of the light ray f1 in the first polarization direction is changed after passing through the quarter-wave plate 132 twice 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.

[0065] Exemplarily, the reflective element 131 includes two relatively arranged surfaces, namely a reflection surface s31 and a first convex surface s32. The reflection surface s31 is located on a side of the reflective element 131 facing away from the first polarization beam splitter 120, and the first convex surface s32 protrudes toward the first polarization beam splitter 120. Thus, during the transmission of the first light ray within the reflective element 131, the first light ray is first reflected by the reflection surface s31 and then passes through the first convex surface s32 and is projected onto the quarter-wave plate 132. Since the first convex surface s32 protrudes toward the first polarization beam splitter 120, the first convex surface s32 has a converging effect on the first light ray, which is beneficial for the imaging of the first light ray and improves the imaging quality.

[0066] In some embodiments, the optical axis of the first convex surface s32 and the optical axis of the reflection surface s31. Exemplarily, the optical axis of the first convex surface s32 and the optical axis of the reflection surface s31 may be coaxial with the optical axis of the light ray f1. Among them, the optical axis of the light ray f1 is the center line of the light beam of the light ray f1. Thus, the optical path overlap degree of the light ray f1 and the light ray f2 is high, and the size of the first reflection component 130 and the first polarization beam splitter 120 along the z direction can be reduced. It is beneficial to reduce the height of the lens module 100 and decrease the volume of the lens module 100.

[0067] In the embodiments of the present application, there is no limitation on the formation method of the reflection surface s31 on the reflective element 131. For example, the reflection surface s31 may be formed by plating a reflective film or pasting a reflective film. In other embodiments of the present application, the foregoing first convex surface s32 is not necessary, and the reflective element 131 may not have the foregoing first convex surface s32. For example, the surface of the reflective element 131 facing away from the reflection surface s31 may be a plane or a concave surface.

[0068] In some embodiments, the first reflection component 130 may not be provided with the aforementioned quarter-wave plate 132. For example, a phase modulator may be used instead of the aforementioned quarter-wave plate 132. Exemplarily, the phase compensation magnitude of the phase modulator for the light ray f1 is equal to an odd multiple of a quarter wavelength of the light ray f1. Among them, the phase compensation magnitude of the phase modulator can be adjusted by the refractive index of the material of the phase modulator and the thickness of the phase modulator, so that the phase modulator has a quarter-phase compensation function for the light ray f1. Thus, the light ray f1 in the first polarization direction passes through the phase modulator twice and can change its polarization direction to obtain the light ray f2 in the second polarization direction.

[0069] In the embodiments of the present application, for the structure of the second polarization transmissive and reflective component 140, please refer to the description of the aforementioned first polarization transmissive and reflective component 120, which will not be elaborated here. Correspondingly, for the structure of the second reflection component 150, please refer to the description of the aforementioned first reflection component 130, which will not be elaborated here.

[0070] The embodiments of the present application do not limit the relative orientation of the second polarization transmissive and reflective component 140 and the first polarization transmissive and reflective component 120. When the user wears the AR glasses, the first polarization transmissive and reflective component 120 can be located on either side of the second polarization transmissive and reflective component 140 as long as the light transmitted through the second polarization transmissive and reflective component 140 can enter the user's eyes.

[0071] In some embodiments of the present application, when the user wears the AR glasses, the second polarization transmissive and reflective component 140 can be located directly in front of the user's eyes. The light ray f6 transmitted through the second polarization transmissive and reflective component 140 enters the user's eyes. The first polarization transmissive and reflective component 120 can be located above, below, to the left, or to the right of the second polarization transmissive and reflective component 140.

[0072] In some embodiments of the present application, the lens module 100 may further include a third lens 160, and the third lens 160 is configured to transmit the first light ray reflected by the first polarization transmissive and reflective component 120 to the second polarization transmissive and reflective component 140. In other words, the third lens 160 is configured to transmit the light ray f3 and project the light ray f3 onto the second polarization transmissive and reflective component 140.

[0073] As Figure 3a shown, the third lens 160 includes two relatively arranged surfaces, namely 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 polarization transmissive and reflective component 120, and the optical surface s62 is the surface of the third lens 160 facing the first polarization transmissive and reflective component 120. The second convex surface s61 protrudes in a direction away from the first polarization transmissive and reflective component 120. Thus, in the process of the light ray f3 passing through the second convex surface s61, the second convex surface s61 has the effect of converging the light rays, making the imaging quality of the first light ray better. The embodiments of the present application do not limit the surface type of the optical surface s62. The optical surface s62 can be, for example, a plane, a spherical surface, or an aspherical surface, etc.

[0074] It can be understood 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 the embodiments where the lens module 100 does not include the third lens 160, the end of the first polarization beam splitter 120 facing the second polarization beam splitter 140 and the end of the second polarization beam splitter 140 facing the first polarization beam splitter 120 can be connected through an adhesive layer (such as an optical adhesive layer). Alternatively, there may be a gap between the end of the first polarization beam splitter 120 facing the second polarization beam splitter 140 and the end of the second polarization beam splitter 140 facing the first polarization beam splitter 120, and gases such as air, nitrogen, or helium can be filled in the aforementioned gap.

[0075] 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 is provided between the first reflection component 130 and the first polarization beam splitter 120. Or, a lens for optimizing the aberration of the light ray f5 is provided between the second reflection component 150 and the second polarization beam splitter 140 to optimize the imaging quality of the lens module 100.

[0076] The embodiments of the present application do not limit the physical connection manners of the linear polarizer 110, the first polarization beam splitter 120, the first reflection component 130, the second polarization beam splitter 140, the second reflection component 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 polarization beam splitter 120, the first reflection component 130, the second polarization beam splitter 140, the second reflection component 150, and the third lens 160 are all connected to the bracket. In the embodiments where the lens module 100 is integrated into an AR glasses, the linear polarizer 110, the first polarization beam splitter 120, the first reflection component 130, the second polarization beam splitter 140, the second reflection component 150, and the third lens 160 can be connected to the frame or the eyeglass frame.

[0077] Figure 3b For Figure 3a the MTF (modulation transfer function) curve graph of the shown lens module 100. The abscissa is the spatial frequency, and the ordinate is the MTF value. Among them, the closer the MTF curve is to 1, the better the image quality of the lens module 100. Figure 3b Illustrate Figure 3a The shown lens module 100 has better image quality.

[0078] Figure 5a This is a schematic structural diagram of another lens module 100 provided by the embodiments of the present application. Figure 5a The shown lens module 100 andFigure 3a The differences of the lens module 100 shown include: the polarization states of the light rays transmitted through the first polarization beam splitter 120 are different, and the lens module 100 may further include a third reflection component 170.

[0079] Figure 5a In [description], the linear polarizer 110 emits the light ray f7 in the second polarization direction. The lens module 100 further includes a third reflection component 170. The foregoing first polarization beam splitter 120 is used to transmit the first light ray emitted by the linear polarizer 110 to the first reflection component 130, which includes: the first polarization beam splitter 120 is used to reflect the first light ray emitted by the linear polarizer 110 to the third reflection component 170, the third reflection component 170 is used to reflect the first light ray reflected by the first polarization beam splitter 120 back to the first polarization beam splitter 120, and the first polarization beam splitter 120 is used to transmit the first light ray reflected by the third reflection component 170 to the first reflection component 130.

[0080] In other words, the first polarization beam splitter 120 is used to reflect the first light ray (light ray f7) emitted by the linear polarizer 110 to the third reflection component 170. Define the light ray (light ray f7) reflected by the first polarization beam splitter 120 from the linear polarizer 110 as light ray f8. The third reflection component 170 is used to reflect the first light ray (light ray f8) reflected by the first polarization beam splitter 120 back to the first polarization beam splitter 120. The first polarization beam splitter 120 is used to transmit the first light ray reflected by the third reflection component 170 to the first reflection component 130. In other words, f0 is the first light ray (light ray f8) reflected by the third reflection component 170 from the first polarization beam splitter 120. The light ray f7 emitted by the linear polarizer 110 is reflected by the first polarization beam splitter 120 and then by the third reflection component 170 to obtain the light ray f0. For the transmission path of the light ray f0 in the lens module 100, please refer to Figure 3a the description in

[0081] The setting of the third reflection component 170 can extend the transmission distance of the first light ray in the lens module 100. The third reflection component 170 can also shape the first light ray. When the optical path of the first light ray is the same, the third reflection component 170 also reduces the divergence angle of the first light ray. The third reflection component 170 adds a reflection surface to the first light ray, provides more optical power for the first light ray, and at the same time increases the degree of freedom for optimizing aberration, thereby improving the imaging quality of the imaging light.

[0082] In the embodiments of the present application, for the structure of the third reflection component 170, please refer to the description of the foregoing first reflection component 130, which will not be elaborated here.

[0083] Figure 5b For Figure 5aMTF curve graph of the lens module 100 shown. The abscissa is the spatial frequency and the ordinate is the MTF value. Among them, the closer the MTF curve is to 1, the better the image quality of the lens module 100. Figure 5b Description Figure 5a The image quality of the lens module 100 shown is relatively good.

[0084] In some embodiments of the present application, in addition to receiving the image light emitted by the display screen 21 (as Figure 1b shown), the user's eyes can also receive ambient light and observe the scene in the environment according to the ambient light. The aforementioned ambient light can be sunlight, light, or light emitted by other electronic devices such as a TV, etc. Exemplarily, in addition to watching the picture played on the display screen 21, the user can also watch the street view, etc.

[0085] Figure 6 It is a schematic structural diagram of another lens module 100 provided by an embodiment of the present application. Figure 6 The lens module 100 shown and Figure 3a the lens module 100 shown are different in that: the lens module 100 may further include a first lens 180.

[0086] Figure 6 In it, the first lens 180 is located on the side of the second reflection component 150 away from the second polarization beam splitter 140. The surface of the second reflection component 150 facing the first lens 180 is a first curved surface s51, and the surface of the first lens 180 facing the second reflection component 150 is a second curved surface s81, and the first curved surface s51 and the second curved surface s81 are attached. The first lens 180 is used to transmit the second light ray 102 to the second reflection component 150, and the second reflection component 150 is further used to transmit the second light ray 102 transmitted by the first lens 180. The second polarization beam splitter 140 is further used to transmit the second light ray 102 transmitted by the second reflection component 150.

[0087] For the convenience of description, the second light ray 102 transmitted by the second reflection component 150 through the first lens 180 is defined as light ray h0. The second light ray 102 transmitted by the second reflection component 150 and transmitted by the second polarization beam splitter 140 is defined as light ray h1. It can be understood that both the light ray h0 and the light ray h1 are the second light ray 102.

[0088] Exemplarily, the second light ray 102 transmitted by the second reflection component 150 and transmitted by the second polarization beam splitter 140 is incident on the user's eyes, and the user can receive the second light ray 102 to observe the picture on the side of the first lens 180 away from the second reflection component 150. In addition, the first curved surface s51 and the second curved surface s81 are attached, and the transmission direction of the second light ray 102 does not change when passing through the first curved surface s51 and the second curved surface s81.

[0089] In some embodiments of the present application, the first curved surface s51 and the second curved surface s81 can be bonded by optical glue. Figure 6 The gap between the first curved surface s51 and the second curved surface s81 in Figure 6 is for easy viewing and does not limit the existence of a gap between the first curved surface s51 and the second curved surface s81.

[0090] It can be understood that since the second polarization transmissive-reflective member 140 is used to transmit light rays in the first polarization direction, therefore, the second polarization transmissive-reflective member 140 can transmit the part of the second light ray 102 whose polarization direction is the first polarization direction. In other words, the light ray h1 in the light ray h0 whose polarization direction is the first polarization direction passes through the second polarization transmissive-reflective member 140 and enters the user's eyes.

[0091] The surface of the first lens 180 facing the second reflection assembly 150 is the optical surface s82. The type of the optical surface s82 is not limited in the embodiments of the present application. For example, the optical surface s82 can be a plane, a spherical surface or an aspherical surface, etc., and is set according to the perspective effect on the second light ray 102.

[0092] The embodiments of the present application also do not limit the relationship between the optical surface s82 and the optical surface s52 of the second reflection assembly 150 facing away from the first curved surface s51. For example, the surface types of the optical surface s82 and the optical surface s52 of the second reflection assembly 150 facing away from the first curved surface s51 are the same. Or, by optimizing the surface types of the optical surface s82 and the optical surface s52, the second light ray 102 entering the user's eyes can be imaged clearly without distortion.

[0093] As Figure 6 shown, in some embodiments, the lens module 100 may further include a second lens 190, and the second lens 190 is located on the side of the second polarization transmissive-reflective member 140 away from the second reflection assembly 150. The optical surface s91 of the second lens 190 facing the second polarization transmissive-reflective member 140 and the surface s41 of the second polarization transmissive-reflective member 140 facing the second lens 190 are adhered. The second lens 190 is used to transmit the first light ray (light ray f5) and the second light ray 102 (light ray h0) transmitted by the second polarization transmissive-reflective member 140. Since the optical surface s91 and the surface s41 are adhered, the change in the optical direction of the second light ray 102 and the first light ray when passing through the optical surface s91 and the surface s41 is small, and image distortion can be avoided.

[0094] The embodiments of the present application do not limit the surface type of the optical surface s92 of the second lens 190 facing away from the second polarization transmissive-reflective member 140. For example, the optical surface s92 can be a plane, a spherical surface or an aspherical surface, etc. Similarly, the embodiments of the present application do not limit the surface type of the optical surface s42 of the second polarization transmissive-reflective member 140 facing away from the second lens 190. For example, the optical surface s42 can be a plane, a spherical surface or an aspherical surface, etc.

[0095] It can be understood thatFigure 5a The lens module 100 shown can also be provided with the first lens 180 and the second lens 190 shown above. Similarly, the user can receive image light and ambient light (such as the second light ray 102). Figure 6 In some embodiments, in order to further increase the field of view angle, the size of the display screen 21 (as shown) can be increased. In order to adapt to the larger-sized display screen, the size of the aforementioned lens module 100 can be increased. Alternatively, the light rays at the edge of the larger-sized display screen 21 can be transmitted through the optical waveguide. The following provides an exemplary description in conjunction with and. It can be understood that the aforementioned larger-sized display screen can also be multiple display screens.

[0096] In some embodiments, to further increase the field of view angle, the size of the display screen 21 (as shown) can be increased. To adapt to the larger-sized display screen, the size of the aforementioned lens module 100 can be increased. Or, the light rays at the edge of the larger-sized display screen 21 can be transmitted through the optical waveguide. The following provides an exemplary description in conjunction with and. It can be understood that the aforementioned larger-sized display screen can also be multiple display screens. Figure 1b shown). To adapt to the larger-sized display screen, the size of the aforementioned lens module 100 can be increased. Or, the light rays at the edge of the larger-sized display screen 21 can be transmitted through the optical waveguide. The following provides an exemplary description in conjunction with and. It can be understood that the aforementioned larger-sized display screen can also be multiple display screens. Figure 7 and Figure 8b are used for exemplary illustration. It can be understood that the aforementioned larger-sized display screen can also be multiple display screens.

[0097] Figure 7 This is a schematic structural diagram of another lens module 100 provided by an embodiment of the present application. Figure 7 The lens module 100 and Figure 3a The lens module 100 of are different in that: the lens module 100 may further include an optical waveguide 210.

[0098] As Figure 7 shown, the optical waveguide 210 includes an input coupling portion 211 and an output coupling portion 212. The output coupling portion 212 is disposed on one side of the second polarization beam splitter 140. The linear polarizer 110 is also used to emit the third light ray 103. The first polarization beam splitter 120 is used to transmit the third light ray 103 emitted by the linear polarizer 110 to the input coupling portion 211. The output coupling portion 212 is used to couple out the third light ray 103 coupled into by the input coupling portion 211. In this way, both the first light ray and the third light ray 103 can enter the user's eyes.

[0099] In addition, the third light ray 103 propagates in the optical waveguide 210, and the optical path of the third light ray 103 overlaps less with the optical path of the first light ray 101. The third light ray 103 and the first light ray 101 hardly interfere with each other. In this way, the setting of the optical waveguide 210 has little influence on the imaging quality of the first light ray 101, and the field of view angle of the lens module 100 can be increased by adjusting the relative positions of the output coupling portion 212 and the light-transmitting area of the second polarization beam splitter 140. For example, by disposing the output coupling portion 212 outside the marginal light rays of the light ray f6 (as shown) emitted by the second polarization beam splitter 140, the size of the field of view angle can be increased. Compared with the lens module 100 in, the field of view angle of the lens module 100 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°. Figure 6 shown), the size of the field of view angle can be increased. Compared with the lens module 100 in, the field of view angle of the lens module 100 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°. Figure 3a in Figure 7 in, the field of view angle of the lens module 100 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°.

[0100] Figure 8aSchematic diagram of the display screen 21 provided by the embodiment of the present application and the picture viewed by the user. Figure 8a In the figure, the display screen 21 may include a central area 22 and an edge area 21. The edge area 21 is located around the central area 22. The embodiment of the present application does not limit the size ratio of the central area 22 to the edge area 21, and it can be set according to actual needs.

[0101] Among them, the aforementioned imaging light is the light emitted from the central area 22, and the aforementioned third light ray 103 is the light ray obtained after the light ray emitted from the edge area 21 passes through the linear polarizer 110.

[0102] The third light ray 103 passes through the first polarization transmissive-reflective element 120 and then is transmitted in the optical waveguide 210 through the coupling-in portion 211, and then is coupled out by the coupling-out portion 212 and projected onto the user's eyes.

[0103] Since the coupling-out portion 212 is disposed on one side of the second polarization transmissive-reflective element 140, the light ray coupled out by the coupling-out portion 212 is located on one side of the first light ray emitted by the second polarization transmissive-reflective element 140.

[0104] For example Figure 8a In the figure, the internal area of the display screen is the picture formed by the imaging light emitted from the central area 22, named Picture One. The edge area of the display screen is the picture formed by the light ray (the aforementioned third light ray 103) emitted from the edge area 21, named Picture Two.

[0105] Figure 8a In the example, Picture Two surrounds Picture One, and there may be a blank area between Picture Two and Picture One, and no pattern is displayed in the blank area. Exemplarily, the coupling-out portion 212 surrounds the outer periphery of the second polarization transmissive-reflective element 140, which can make Picture Two surround Picture One. In some embodiments, the coupling-out portion 212 may be disposed on one side of the second polarization transmissive-reflective element 140, so that Picture Two is located on one side of Picture One. Or, the coupling-out portion 212 may be disposed on opposite sides of the second polarization transmissive-reflective element 140, and there is Picture Two on both opposite sides of Picture One, and so on, which will not be elaborated here.

[0106] Similarly, in the embodiment of the present application, the coupling-in portion 211 may be disposed around the first reflection component 130, or the coupling-in portion 211 may be disposed on one side of the first reflection component 130, or the coupling-in portion 211 may be disposed on opposite sides of the first reflection component 130.

[0107] The embodiment of the present application does not limit the content displayed on Picture One and Picture Two. Exemplarily, Picture One may display the main picture, and Picture Two may display the auxiliary picture (such as prompt information). The blank area divides Picture One and Picture Two, which is convenient for the user to quickly obtain various information.

[0108] It can be understood that, in some embodiments of the present application, the aforementioned blank area may not be provided. In addition, in some embodiments of the present application, the third light ray 103 and the imaging light may come from different display screens 21. Alternatively, the third light ray 103 may not come from the display screen 21. For example, the third light ray 103 may come from other light sources such as a warning light.

[0109] In an embodiment where the first reflection component 130 includes a reflective element 131 and a quarter-wave plate 132, the third light ray 103 transmitted through the first polarization beam splitter 120 may pass through the quarter-wave plate 132 and then enter the optical waveguide 210 through the coupling portion 211. Alternatively, the third light ray 103 transmitted through the first polarization beam splitter 120 may enter the optical waveguide 210 through the coupling portion 211 without passing through the quarter-wave plate 132. It can be set according to the size of the quarter-wave plate 132, and the embodiments of the present application do not limit this.

[0110] Figure 7 In an embodiment, both the first reflection component 130 and the second polarization beam splitter 140 are connected to the optical waveguide 210. In this way, the relative positions of the first reflection component 130, the second polarization beam splitter 140, and the optical waveguide 210 are fixed, reducing the degrees of freedom, which is beneficial to improving the assembly accuracy and reducing the assembly cost. Exemplarily, the first reflection component 130 may be connected to the optical waveguide 210 through an adhesive layer, and the second polarization beam splitter 140 may be connected to the optical waveguide 210 through an adhesive layer.

[0111] The embodiments of the present application do not limit the structure of the optical waveguide 210. Exemplarily, the optical waveguide 210 may be a grating. Alternatively, the optical waveguide 210 may be structures such as a prism or an optical fiber.

[0112] Similarly, in other embodiments of the present application, the third light ray 103 may not pass through the linear polarizer 110.

[0113] Figure 8b FIG. 17 is a schematic structural diagram of another lens module 100 provided by the embodiments of the present application. Figure 8b Compared with Figure 7 The difference lies in that the source of the third light ray 103 is different. Figure 8b In an example, the lens module 100 may further include a secondary display screen 201. The secondary display screen 201 is used to emit the third light ray 103, and the coupling portion 211 is used to couple the third light ray 103 emitted by the secondary display screen 201.

[0114] Figure 8b In an embodiment, the third light ray 103 may not pass through the linear polarizer 110, the first polarization beam splitter 120, and the first reflection component 130. Therefore, the third light ray 103 entering the user's eyes is fully polarized light, and the utilization rate of the third light ray 103 is relatively high.

[0115] Figure 8b In the embodiments, the secondary display screen 201 and the linear polarizer 110 are respectively located on opposite sides of the optical waveguide 210. In other embodiments, the secondary display screen 201, the linear polarizer 110, and the optical waveguide 210 may have other relative positional relationships, as long as the secondary display screen 201 does not affect the imaging of the first light ray 101.

[0116] It can be understood that Figure 5a the lens module 100 shown, as well as Figure 6 the lens module 100 shown may also include the optical waveguide 210 described in the foregoing Figure 7 or Figure 8b example.

[0117] Figure 3a , Figure 5a , Figure 6 and Figure 7 In the examples of, the optical axis of the first reflection component 130, the optical axis of the first polarization beam splitter 120, and the optical axis of the second polarization beam splitter 140 are coplanar.

[0118] Exemplarily, Figure 3a , Figure 5a , Figure 6 and Figure 7 In the examples of, the normal of the reflection surface of the first polarization beam splitter 120, the normal of the reflection surface of the second polarization beam splitter 140, and the optical axis of the first reflection component 130 are coplanar. For example, Figure 3a , Figure 5a , Figure 6 and Figure 7 In the examples of, the normal of the reflection surface of the first polarization beam splitter 120, the normal of the reflection surface of the second polarization beam splitter 140, and the optical axis of the first reflection component 130 are all parallel to the paper surface.

[0119] Wherein, the normal of the reflection surface of the first polarization beam splitter 120 is: the line perpendicular to the reflection surface of the first polarization beam splitter 120 for reflecting the light ray f2 reflected by the first reflection component 130. Similarly, the normal of the reflection surface of the second polarization beam splitter 140 is: the line perpendicular to the reflection surface of the second polarization beam splitter 140 for reflecting the light ray f3 reflected by the first polarization beam splitter 120. The optical axis of the first reflection component 130 is: the optical axis of the reflection surface of the first reflection component 130 for reflecting the light ray f1 transmitted through the first polarization beam splitter 120.

[0120] In some embodiments of the present application, the relative positional relationship of the optical axis of the first reflection component 130, the optical axis of the first polarization beam splitter 120, and the optical axis of the second polarization beam splitter 140 can be set according to spatial requirements.

[0121] Figure 9This is a schematic structural diagram of another lens module 100 provided by an embodiment of the present application. Figure 9 The lens module 100 and Figure 3a The differences of the lens module 100 include: the installation orientations of the first polarization beam splitter 120 and the first reflection component 130 are different.

[0122] Figure 9 In the example of, the normal lines of the reflection surfaces of the first polarization beam splitter 120 are not coplanar with the normal lines of the reflection surfaces of the second polarization beam splitter 140. Then, the optical axes of the first light ray after being reflected by the reflection surface of the first polarization beam splitter 120 and the optical axes of the first light ray after being reflected by the first reflection component 130 are not coplanar. Thus, during the transmission of the first light ray in the Figure 9 shown lens module 100, the first light ray has transmissions in multiple directions. For example, it has transmissions in the x direction, y direction, and z direction. The dimensions of the lens module 100 in the x direction, y direction, and z direction can be changed. For example, the dimension of the lens module 100 in the x direction can be reduced by extending the dimension of the lens module 100 in the y direction, and the thickness of the lens module 100 can be reduced according to requirements.

[0123] Figure 9 In, the normal line of the reflection surface of the first polarization beam splitter 120 is k1, the normal line of the reflection surface of the second polarization beam splitter 140 is k2, and k1 and k2 are not coplanar.

[0124] In some embodiments, the normal line k1 of the reflection surface of the first polarization beam splitter 120 is perpendicular to the reference plane c, and the reference plane c is the plane where the optical axis of the second reflection component 150 and the normal line of the reflection surface of the second polarization beam splitter 140 are located. In other words, the plane where the optical axis of the second reflection component 150 and the normal line k2 of the reflection surface of the second polarization beam splitter 140 are located is defined as the reference plane c, and the normal line k1 of the reflection surface of the first polarization beam splitter 120 is perpendicular to the reference plane c. Thus, the transmission distance of the first light ray in the x direction is shorter, and the dimension of the lens module 100 in the x direction can be further reduced.

[0125] Exemplarily, the fact that the normal line k1 of the reflection surface of the foregoing first polarization beam splitter 120 is perpendicular to the reference plane c includes: the included angle between the normal line k1 of the reflection surface of the first polarization beam splitter 120 and the reference plane c is 60° to 120°. For example, the included angle between the optical axis of the first reflection component 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.

[0126] It can be understood that in other embodiments, the included angle between the normal line k1 of the reflecting surface of the first polarization beam splitter 120 and the reference plane c plane is not limited to the above range, and can be set according to the dimensional requirements of the lens module 100 in the x direction, y direction, and z direction.

[0127] Similarly, Figure 5a , Figure 6 and Figure 7 in the examples of, the relationship between the normal line of the reflecting surface of the first polarization beam splitter 120 and the normal line of the reflecting surface of the second polarization beam splitter 140 can also be set to Figure 9 the relationship shown in, and the dimensional sizes of the lens module 100 in each direction can also be adjusted, which will not be elaborated here.

[0128] As described above, the above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A lens module, characterized in that, The lens module includes: A linear polarizer for emitting a first light ray; A first polarization beam splitter; for transmitting the first light ray emitted by the linear polarizer to a first reflection component; The first reflection component for reflecting the first light ray transmitted by the first polarization beam splitter back to the first polarization beam splitter; the polarization directions of the first light ray received by the first reflection component and the first light ray reflected by the first reflection component are perpendicular to each other; The first polarization beam splitter is further configured to reflect the first light ray reflected by the first reflection component to a second polarization beam splitter; The second polarization beam splitter for reflecting the first light ray reflected by the first polarization beam splitter; The second reflection component for reflecting the first light ray reflected by the second polarization beam splitter back to the second polarization beam splitter; wherein, the polarization directions of the first light ray received by the second reflection component and the first light ray reflected by the second reflection component are perpendicular to each other; The second polarization beam splitter is further configured to transmit the first light ray reflected by the second reflection 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 reflection component away from the second polarization beam splitter, a surface of the second reflection component facing the first lens is a first curved surface, a surface of the first lens facing the second reflection component is a second curved surface, and the first curved surface is in contact with the second curved surface; The first lens is configured to transmit a second light ray to the second reflection component, the second reflection component is further configured to transmit the second light ray transmitted by the first lens, and the second polarization beam splitter is further configured to transmit the second light ray transmitted by the second reflection component.

3. The lens module according to claim 2, characterized in that, The lens module further includes: a second lens; the second lens is located on a side of the second polarization beam splitter away from the second reflection component, and a surface of the second lens facing the first polarization beam splitter is in contact with a surface of the first polarization beam splitter facing the second lens.

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

5. The lens module according to claim 4, wherein The reflecting element includes a reflection surface and a first convex surface arranged oppositely, the reflection surface is located on a side of the reflecting element away from the first polarization beam splitter, and the first convex surface protrudes towards the first polarization beam splitter.

6. The lens module according to claim 5, wherein The optical axis of the reflection surface is coaxial with the optical axis of the first convex surface.

7. The lens module according to any one of claims 1-6, characterized in that, The normal of the reflection surface of the first polarization beam splitter, the normal of the reflection surface of the second polarization beam splitter, and the optical axis of the first reflection component are not coplanar.

8. The lens module according to claim 7, wherein The normal of the reflection surface of the first polarization beam splitter 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 of the reflection surface of the second polarization beam splitter are located.

9. The lens module according to any one of claims 1-8, characterized in that, The lens module further includes: an optical waveguide, the optical waveguide includes an input coupling portion and an output coupling portion, and the output coupling portion is arranged on a side of the second polarization beam splitter away from the second reflection component; The linear polarizer is further configured to emit a third light ray, the first polarization beam splitter is further configured to transmit the third light ray to the light coupling portion, and the light output portion is configured to output the third light ray coupled into by the light coupling portion.

10. The lens module according to claim 9, wherein Both the first reflection component and the second polarization beam splitter are connected to the optical waveguide.

11. The lens module according to any one of claims 1-10, characterized in that, The lens module further includes: a third lens configured to transmit the first light ray reflected by the first polarization beam splitter to the second polarization beam splitter; The surface of the third lens facing away from the first polarization beam splitter is a second convex surface, and the second convex surface protrudes away from the first polarization beam splitter.

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

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

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

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

Images