Optical waveguide and near-eye display device

Abstract

The application provides an optical waveguide and a near-eye display device. The optical waveguide comprises a single-layer light guide, a coupling-in module arranged outside the light guide, a first film layer and a reflecting surface in the light guide; the reflecting surface is located on a side of the first film layer away from the coupling-in module; the first film layer can reflect part of light and transmit part of light; the optical waveguide further comprises a coupling-out module in the light guide, the coupling-out module comprises a first sub-coupling-out module, a second sub-coupling-out module and a third sub-coupling-out module away from the coupling-in module; the second sub-coupling-out module, the first sub-coupling-out module and the third sub-coupling-out module can reflect and transmit part of light. In the above technical solution, the cooperation of the reflecting surface and the first film layer makes the light propagate in the light guide at different reflection angles, thereby improving the light uniformity. When coupling out, the light is coupled out through the three sub-coupling-out modules, thereby improving the display effect of the near-eye display device.

Description

Technical Field

[0001] This application relates to the field of near-eye display technology, and more particularly to an optical waveguide and near-eye display device. Background Technology

[0002] Augmented Reality (AR) technology is a technology that combines virtual scenes with the real world. AR devices based on arrayed waveguide solutions have advantages such as thin and light design, high transmittance, and low mass production cost, making arrayed waveguide solutions one of the mainstream solutions for AR devices.

[0003] In a conventional array waveguide layout, light emitted from the optomechanical system is reflected at the coupling module and enters the waveguide, changing its propagation direction. Light rays satisfying the total internal reflection condition propagate along the waveguide to the relay module, whose function is to increase the exit pupil range. The light rays redirected by the relay module propagate to the output module, where they are reflected and leave the waveguide before entering the human eye to form an image on the retina.

[0004] However, current optical waveguides produce poor display results. Summary of the Invention

[0005] This application provides an optical waveguide and a near-eye display device to improve the display effect of the near-eye display device.

[0006] In a first aspect, an optical waveguide is provided, comprising a single-layer light guide, a coupling module disposed outside the light guide, a first film layer and a reflective surface located within the light guide; wherein the reflective surface is located on the side of the first film layer opposite to the coupling module.

[0007] The first film layer can reflect some light and transmit some light; The optical waveguide further includes a coupling module located within the light guide element. The coupling module includes a first sub-coupling module, a second sub-coupling module, and a third sub-coupling module arranged away from the coupling module. The second sub-coupling module, the first sub-coupling module, and the third sub-coupling module can all reflect and transmit part of the light.

[0008] In the above technical solution, by using the combination of a reflective surface and a first film layer, light propagates within the light guide at different reflection angles, improving the light uniformity effect. Furthermore, during coupling, light is coupled out through three sub-coupling modules, improving the display effect of the near-eye display device.

[0009] In one specific implementation, the first film layer is parallel to the total internal reflection surface of the light guide.

[0010] In one specific implementation, the reflective surface is tilted relative to the total internal reflective surface.

[0011] In one specific implementation, along the length of the light guide, the length of the reflective surface is greater than the length of the first film layer.

[0012] In one specific implementation, the two total internal reflection surfaces of the light guide are a first total internal reflection surface and a second total internal reflection surface, respectively; the second total internal reflection surface is located away from the coupling module; One end of the reflective surface intersects with the second total internal reflective surface, and the other end intersects with the side surface of the light guide; the side surface intersects with the second total internal reflective surface.

[0013] In one specific implementation, the second sub-coupling module is located between the first sub-coupling module and the third sub-coupling module.

[0014] In one specific implementation, the first sub-coupling module includes a plurality of parallel second membrane layers, the second sub-coupling module includes a plurality of parallel third membrane layers, and the third sub-coupling module includes a plurality of parallel fourth membrane layers. The second, third, and fourth films are all tilted relative to the total internal reflection surface of the light guide, and can reflect and transmit some light.

[0015] In one specific implementation, the arrangement density of the third film layer is greater than that of the second film layer and the fourth film layer.

[0016] In one specific implementation, the arrangement density of the second film layer is the same as that of the fourth film layer.

[0017] In one specific possible implementation, the third film layer has a different tilt angle than the second film layer; and / or, The third film layer and the fourth film layer have different tilt angles.

[0018] In one specific implementation, the second film layer and the fourth film layer have the same tilt angle.

[0019] In one specific implementation, the angle between the third film layer and the total internal reflective surface is smaller than the angle between the second film layer and the total internal reflective surface.

[0020] In one specific implementation, the first film layer is a polarization beam splitting film layer, and the first film layer reflects light of the first polarization state and transmits light of the second polarization state; The second film layer and the fourth film layer are polarization beam splitting film layers, and the second film layer and the fourth film layer reflect light of the second polarization state and transmit light of the first polarization state; The third film layer is a polarization beam splitting film layer, and the third film layer reflects light of the first polarization state and transmits light of the second polarization state.

[0021] In one specific implementation, the first film layer, the second film layer, the third film layer, and the fourth film layer are all partially reflective and partially transmissive layers.

[0022] In one specific implementation, the light guide is further provided with a light-uniforming film layer corresponding to the coupling module.

[0023] In a second aspect, a near-eye display device is provided, the near-eye display device including a light source and an optical waveguide as described in any of the above; wherein the light emitted by the light source is coupled into the light guide through the coupling module and propagates through total internal reflection.

[0024] In the above technical solution, by using the combination of a reflective surface and a first film layer, light propagates within the light guide at different reflection angles, improving the light uniformity effect. Furthermore, during coupling, light is coupled out through three sub-coupling modules, improving the display effect of the near-eye display device. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the application scenario of the optical waveguide provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of an optical waveguide provided in an embodiment of this application. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0027] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] To facilitate understanding of the optical waveguide provided in this application embodiment, its application scenarios are first described, and a schematic diagram of the application scenarios of the optical waveguide provided in this application embodiment is shown. The optical waveguide provided in this application embodiment is applied in AR (Augmented Reality) or VR (Virtual Reality) devices. Current optical waveguides exhibit poor display effects during propagation. Therefore, this application embodiment provides an optical waveguide to improve the display effect of AR or VR devices. A detailed description follows with reference to specific accompanying drawings and embodiments.

[0029] refer to Figure 1 , Figure 1 This illustration shows an application scenario of the optical device provided in this application embodiment. In the application scenario provided by this application embodiment, the light emitted by the light generator 200 enters the light guide 110 in the optical device 100, and is coupled through the reflecting surface 120 of the optical device 100 to the two total internal reflection surfaces of the light guide 110 for total internal reflection to propagate the light. The light is then coupled out of the light guide 110 through the coupling element 130 in the light guide 110 to propagate to the user's eye. The light emitted by the light generator 200 can be a collimated image. The light generator 200 can be an optical collimating device, or it can also be a light source generator assembly with scanning properties; no specific limitations are made in this application embodiment.

[0030] refer to Figure 2 As shown, this application provides an optical waveguide, which mainly includes a single-layer light guide 10. The light guide 10 has two opposing total internal reflection surfaces 11, and light incident into the light guide 10 can propagate through total internal reflection between the two total internal reflection surfaces 11.

[0031] In addition, the optical waveguide also includes a coupling module 20 and a coupling module 30 disposed on the outside of the light guide 10. The coupling module 20 is used to couple light into the light guide 10 for total internal reflection propagation, and the coupling module 30 is used to couple light from inside the light guide 10 to the outside of the light guide 10. The coupling module 20 and the coupling module 30 are located at opposite ends of the light guide 10. For ease of description, the two ends of the light guide 10 along its length are respectively named the first end and the second end. The coupling module 20 is located at the first end of the light guide 10, and the coupling module 30 is located at the second end of the light guide 10.

[0032] The light guide 10 has a first film layer 40 and a reflective surface 50, which together form a light mixing assembly. The first film layer 40 and the reflective surface 50 are located at the first end of the light guide 10 along with the coupling module 20. Light incident on the light guide 10 through the coupling module 20 first passes through the first film layer 40 and the reflective surface 50 for mixing, and then is reflected within the inner ring of the light guide 10.

[0033] In a specific configuration, the first film layer 40 and the reflective surface 50 are arranged along the thickness direction of the light guide 10, with the reflective surface 50 located on the side of the first film layer 40 facing away from the coupling module 20. Light coupled into the coupling module 20 first enters the first film layer 40, which reflects and transmits some of the light. Part of the incident light is reflected by the first film layer 40, while the other part is transmitted through the first film layer 40 and then enters the reflective surface 50, where it is reflected again, thus splitting the incident light into two beams, such as... Figure 2 The light ray a shown is split into light ray b and light ray c. Light ray b and light ray c have different reflection angles, so that when they propagate within the light guide 10, they undergo total internal reflection within the light guide 10 at different reflection angles.

[0034] The output module 30 includes a first sub-output module 31, a second sub-output module 32, and a third sub-output module 33 arranged along the distance from the input module 20. For example, the second sub-output module 32 is located between the first sub-output module 31 and the third sub-output module 33, and the three sub-output modules are arranged along the length direction of the light guide 10, with the first sub-output module 31 close to the input module 20.

[0035] The first sub-coupling module 31, the second sub-coupling module 32, and the third sub-coupling module 33 can all reflect and transmit part of the light. For example, the light incident on the coupling module 30 is partially reflected by the first sub-coupling module 31 to be coupled out of the light guide 10, and another part of the light is transmitted through the first sub-coupling module 31 to the second sub-coupling module. Part of the light is then reflected by the second sub-coupling module 32 to be coupled out of the light guide 10, part of the light is transmitted by the second sub-coupling module 32 to the third sub-coupling module 33, part of the light is reflected by the third sub-coupling module 33 to be coupled out of the light guide 10, and part of the light is transmitted through the third sub-coupling module 33.

[0036] As can be seen from the above description, by arranging a first film layer 40 and a reflective surface 50 within the light guide 10, the cooperation between the reflective surface 50 and the first film layer 40 allows light to propagate within the light guide 10 at different reflection angles, thus improving the light uniformity effect. Furthermore, during coupling, the light is coupled out through three sub-coupling modules, improving the display effect of the near-eye display device.

[0037] When specifically arranging the reflective surface 50 and the first film layer 40, the angles formed by the first film layer 40 and the reflective surface 50 with the total internal reflective surface 11 within the light guide 10 are different, so that the first film layer 40 and the reflective surface 50 present different reflection angles when reflecting light. The angle between the reflective surface 50 and the total internal reflective surface 11 is greater than the angle between the first film layer 40 and the total internal reflective surface 11. For example, the first film layer 40 is parallel to the total internal reflective surface 11 of the light guide 10, and the reflective surface 50 is inclined relative to the total internal reflective surface 11.

[0038] Of course, the first film layer 11 can also be approximately parallel or not parallel to the total internal reflection surface 11. The position and angle of the first film layer 11 are related to the position of the coupling module and the angle at which the light is incident into the light guide 10. The first film layer 11 only needs to enable partial total internal reflection of the light incident into the light guide 10.

[0039] Continue to refer to Figure 2 In one alternative embodiment, the first film layer 40 is parallel to the total internal reflection surface 11 of the light guide 10, so that when the first film layer 40 reflects light, the reflection angle of the light is the same as that of the total internal reflection surface 11. That is, when light ray b is reflected, the reflection angle of its total internal reflection is the same as that of light ray a when it is reflected in the light guide 10.

[0040] In an alternative configuration, the reflective surface 50 is tilted relative to the total internal reflective surface 11. For example, the two total internal reflective surfaces 11 of the light guide 10 are a first total internal reflective surface 111 and a second total internal reflective surface 112, wherein the second total internal reflective surface 112 is away from the coupling module 20. When arranging the reflective surface 50, one end of the reflective surface 50 intersects with the second total internal reflective surface 112, and the other end intersects with a side surface of the light guide 10, which in turn intersects with the second total internal reflective surface 112. That is, when the reflective surface 50 is tilted, its tilt direction is tilted away from the first total internal reflective surface 111. When arranged in this manner, the reflection angle of light ray c during total internal reflection is greater than the reflection angle of light ray a during total internal reflection within the light guide 10. This causes light rays b and c to propagate at different angles within the light guide 10.

[0041] In an alternative embodiment, the first film layer 40 intersects with one end of the reflective surface 50 to occupy less space and reduce the space occupied by the light guide 10.

[0042] In one alternative embodiment, the length of the reflective surface 50 is greater than the length of the first film layer 40 along the length of the light guide 10. That is, one end of the reflective surface 50 is exposed outside the first film layer 40 along the length of the light guide 10, so that light rays incident on the first film layer 40 at different angles can be reflected by the reflective surface 50 after being transmitted through the first film layer 40.

[0043] The first film layer 40, the first sub-coupler module 31, the second sub-coupler module 32, and the third sub-coupler module 33 can be implemented using different schemes for partial transmission and partial reflection. For example, the first film layer 40, the first sub-coupler module 31, the second sub-coupler module 32, and the third sub-coupler module 33 can all be partially reflective and partially transmissive layers. Alternatively, the first film layer 40, the first sub-coupler module 31, the second sub-coupler module 32, and the third sub-coupler module 33 can all transmit and reflect light with different polarization states.

[0044] In one optional embodiment, the first sub-coupling module 31, the second sub-coupling module 32, and the third sub-coupling module 33 each include multiple parallel film layers that can reflect and transmit a portion of light. For example, the first sub-coupling module 31 includes multiple parallel second film layers 311, the second sub-coupling module 32 includes multiple parallel third film layers 321, and the third sub-coupling module 33 includes multiple parallel fourth film layers 331. Furthermore, the second film layers 311, third film layers 321, and fourth film layers 331 are all inclined relative to the total internal reflection surface 11 of the light guide 10 and can reflect and transmit a portion of light. During light propagation, light can be reflected and transmitted by the second film layers 311, third film layers 321, and fourth film layers 331, thereby increasing the light-emitting area of ​​the light guide 10.

[0045] For example, the first film layer 40 is a polarizing beam-splitting film layer, which reflects light of a first polarization state and transmits light of a second polarization state; the second film layer 311 and the fourth film layer 331 are polarizing beam-splitting film layers, which reflect light of a second polarization state and transmit light of a first polarization state; the third film layer 321 is a polarizing beam-splitting film layer, which reflects light of a first polarization state and transmits light of a second polarization state. It should be understood that when reflecting light of a second polarization state, the second film layer 311 and the fourth film layer 331 may partially reflect and partially transmit.

[0046] Taking light with the first polarization state as P-light and light with the second polarization state as S-light as an example, the light coupled into the coupling module 20 includes both S-light and P-light. S-light is reflected by the first film layer 40 and propagates through total internal reflection within the light guide 10. P-light passes through the first film layer 40 and is reflected by the reflecting surface 50 into the light guide 10 for propagation through total internal reflection. When S-light and P-light propagate to the second film layer 311, P-light is partially reflected and partially transmitted, while S-light passes through the second film layer 311. P-light transmitted through the second film layer 311 is transmitted through the third film layer 321, and S-light transmitted through the second film layer 311 is partially reflected and partially transmitted by the third film layer 321. P-light transmitted through the third film layer 321 is reflected and partially transmitted by the fourth film layer 331.

[0047] When the above method is adopted, the central region of the coupling module 30 corresponds to the S-light, and part of the reflective surface 50 in this region is set to reflect the S-light and transmit a large amount of P-light. The edge region corresponds to the P-light, and part of the reflective surface 50 in this region is set to reflect the P-light and transmit a large amount of S-light, so that the P-light and S-light in the incident light can be fully utilized for display.

[0048] In addition to the above-described embodiments, the first film layer 40 may be a polarizing beam splitter, and the second film layer 311, the third film layer 321, and the fourth film layer 331 may be partially reflective and partially transmissive films. Alternatively, the first film layer 40 may be a partially transmissive and partially reflective film, while the second film layer 311, the third film layer 321, and the fourth film layer 331 may be polarizing beam splitters.

[0049] Continue to refer to Figure 2In one optional embodiment, the arrangement density of the third film layer 321 is greater than that of the second film layer 311 and the fourth film layer 331. For example, the density of the second film layer 311 is a first density, the density of the third film layer 321 is a second density, and the density of the fourth film layer 331 is a third density. Therefore, the second density is greater than the first density, and the second density is greater than the third density. This results in a situation where the film layer arrangement density is high in the middle region and sparse in the edge region of the light guide 10. For example, the arrangement density of the second film layer 311 and the fourth film layer 331 is the same, and the arrangement density of the third film layer 321 is greater than that of the second film layer 311 and the fourth film layer 331, thereby achieving a clearer display in the middle region of the display area and a more balanced display effect at the edges.

[0050] When the second film layer 311, the third film layer 321, and the fourth film layer 331 are all arranged at an angle relative to the total internal reflection surface 11, they can be arranged with different tilt angles. For example, the tilt angles of the second film layer 311, the third film layer 321, and the fourth film layer 331 may be different or partially the same. For instance, the tilt angle of the third film layer 321 may be different from that of the second film layer 311; and / or, the tilt angle of the third film layer 321 may be different from that of the fourth film layer 331. In a specific arrangement, the tilt angles of the third film layer 321 and the second film layer 311 are different, and the tilt angles of the third film layer 321 and the fourth film layer 331 are different; or, the tilt angles of the third film layer 321 and the second film layer 311 are different, and the tilt angles of the third film layer 321 and the fourth film layer 331 are the same; or, the tilt angles of the third film layer 321 and the second film layer 311 are the same, and the tilt angles of the third film layer 321 and the fourth film layer 331 are different; or, the tilt angles of the third film layer 321 and the second film layer 311 are the same, and the tilt angles of the third film layer 321 and the fourth film layer 331 are the same.

[0051] In a specific example, the second film layer 311 and the fourth film layer 331 have the same tilt angle, and the third film layer 321 has a different tilt angle than the second film layer 311 and the fourth film layer 331, so that the edge area of ​​the display area reflects at the same angle, thereby improving the uniformity of the edge display.

[0052] In addition, the tilt angle of the third film layer 321 can be greater than that of the second film layer 311 and the fourth film layer 331. That is, the angle between the third film layer 321 and the total internal reflection surface 11 is smaller than the angle between the second film layer 311 and the total internal reflection surface 11, so that the central area of ​​the display area can obtain a larger field of view and improve the display effect.

[0053] In an optional configuration, the first film layer 40, the second film layer 311, the third film layer 321, the fourth film layer 331, and the reflective surface 50 can be fixedly connected to the light guide 10 by bonding or adhesive bonding. Different connection methods can be selected as needed during specific configuration. Furthermore, when arranging the first film layer 40, the second film layer 311, the third film layer 321, and the fourth film layer 331, they can be made of a material with approximately the same refractive index as the light guide 10 to ensure that the propagation path of the transmitted light remains as unchanged as possible.

[0054] Continue to refer to Figure 2 In an optional embodiment, the optical waveguide provided in this application further includes a light-diffusing film layer corresponding to the coupling module 30. This light-diffusing film layer is arranged at the light-emitting side of the light guide 10. Light coupled out by the coupling module 30 can be uniformly diffused by the light-diffusing film layer, thereby improving the display effect. Specifically, the light-diffusing film can be arranged between adjacent film layers, such as between adjacent second film layers 311, between adjacent second film layers 311 and third film layers 321, between adjacent third film layers 321, between adjacent third film layers 321 and fourth film layers 331, and between adjacent fourth film layers 331, so that light reflected from each film layer can be uniformly diffused by the light-diffusing film layer, improving the display effect.

[0055] As can be seen from the above description, the optical waveguide provided in this embodiment uses a single-layer optical waveguide to transmit light. Through the cooperation of the first film layer 40, the reflective surface 50, and the coupling module 30, it can simultaneously achieve good clarity and a wide viewing angle. Furthermore, the optical waveguide has a simple structure and is easy to manufacture. During coupling, the first sub-coupling module 31, the second sub-coupling module 32, and the third sub-coupling module 33 can be arranged to provide a good central field-of-view pattern in the central area of ​​the display area and a wide-view peripheral image in the edge area, thus improving the display effect.

[0056] This application embodiment also provides a near-eye display device, which includes a light source and an optical waveguide as described above; wherein the light emitted by the light source is coupled into the light guide 10 through the coupling module 20 and propagates through total internal reflection.

[0057] In the above technical solution, by using the combination of reflective surface 50 and first film layer 40, light propagates within light guide 10 at different reflection angles, improving the light uniformity effect. Furthermore, during coupling, light is coupled out through three sub-coupling modules, improving the display effect of the near-eye display device.

[0058] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.

[0059] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical waveguide, characterized in that, The light guide includes a single-layer light guide, a coupling module disposed outside the light guide, a first film layer and a reflective surface located inside the light guide; wherein the reflective surface is located on the side of the first film layer opposite to the coupling module. The first film layer can reflect some light and transmit some light; The optical waveguide further includes a coupling module located within the light guide element. The coupling module includes a first sub-coupling module, a second sub-coupling module, and a third sub-coupling module arranged away from the coupling module. The second sub-coupling module, the first sub-coupling module, and the third sub-coupling module can all reflect and transmit part of the light.

2. The optical waveguide according to claim 1, characterized in that, The first film layer is parallel to the total internal reflection surface of the light guide.

3. The optical waveguide according to claim 2, characterized in that, The reflective surface is inclined relative to the total internal reflective surface.

4. The optical waveguide according to claim 3, characterized in that, Along the length of the light guide, the length of the reflective surface is greater than the length of the first film layer.

5. The optical waveguide according to claim 4, characterized in that, The two total internal reflection surfaces of the light guide are a first total internal reflection surface and a second total internal reflection surface; the second total internal reflection surface is away from the coupling module; One end of the reflective surface intersects with the second total internal reflective surface, and the other end intersects with the side surface of the light guide; the side surface intersects with the second total internal reflective surface.

6. The optical waveguide according to any one of claims 1 to 5, characterized in that, The second sub-coupling module is located between the first sub-coupling module and the third sub-coupling module.

7. The optical waveguide according to claim 6, characterized in that, The first sub-coupling module includes a plurality of parallel second membrane layers, the second sub-coupling module includes a plurality of parallel third membrane layers, and the third sub-coupling module includes a plurality of parallel fourth membrane layers. The second, third, and fourth films are all tilted relative to the total internal reflection surface of the light guide, and can reflect and transmit some light.

8. The optical waveguide according to claim 7, characterized in that, The arrangement density of the third film layer is greater than that of the second film layer and the fourth film layer.

9. The optical waveguide according to claim 8, characterized in that, The arrangement density of the second film layer is the same as that of the fourth film layer.

10. The optical waveguide according to claim 8, characterized in that, The third film layer has a different tilt angle than the second film layer; and / or, The third film layer and the fourth film layer have different tilt angles.

11. The optical waveguide according to claim 10, characterized in that, The second film layer has the same tilt angle as the fourth film layer.

12. The optical waveguide according to claim 11, characterized in that, The angle between the third film layer and the total internal reflection surface is smaller than the angle between the second film layer and the total internal reflection surface.

13. The optical waveguide according to claim 7, characterized in that, The first film layer is a polarization beam splitting film layer, and the first film layer reflects light of the first polarization state and transmits light of the second polarization state; The second film layer and the fourth film layer are polarization beam splitting film layers, and the second film layer and the fourth film layer reflect light of the second polarization state and transmit light of the first polarization state; The third film layer is a polarization beam splitting film layer, and the third film layer reflects light of the first polarization state and transmits light of the second polarization state.

14. The optical waveguide according to claim 7, characterized in that, The first film layer, the second film layer, the third film layer, and the fourth film layer are all partially reflective and partially transmissive layers.

15. The optical waveguide according to claim 6, characterized in that, The light guide is also provided with a light-diffusing film layer corresponding to the coupling module.

16. A near-eye display device, characterized in that, It includes a light source and an optical waveguide as described in any one of claims 1 to 15; wherein the light emitted by the light source is coupled into the light guide through the coupling module and propagates through total internal reflection.

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