Optical waveguide assembly and near-eye display device

Abstract

The application provides an optical waveguide assembly and a near-eye display device. The optical waveguide assembly comprises a light guide and a polarization beam splitting prism assembly. The polarization beam splitting prism assembly comprises a polarization beam splitting prism assembly. A laser and a galvanometer are arranged on two sides of the polarization beam splitting prism. Laser emitted by the laser is reflected to the galvanometer through the polarization beam splitting prism assembly. Light reflected by the galvanometer is transmitted through the polarization beam splitting prism assembly and is incident into the light guide. The incident light is reflected to the galvanometer through the polarization beam splitting prism assembly, and the light reflected by the galvanometer is propagated into the light guide. The cooperation between the size of the galvanometer and the polarization beam splitting prism assembly ensures that the reflected light can be reflected into the light guide. In addition, the incident light and the reflected light are incident from two different surfaces of the polarization beam splitting prism assembly, which improves the rationality of the arrangement of the components, reduces the space occupied by the device, and improves the miniaturization 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 component and a 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 by a galvanometer and then coupled into the waveguide via a coupling module, changing its propagation direction. Light satisfying the total internal reflection condition propagates along the waveguide to the relay module, whose function is to increase the exit pupil range. Light redirected by the relay module propagates to the output module, where it is reflected, leaves the waveguide, and enters the eye, forming an image on the retina. However, as people's demands for quality of life increase, higher requirements are being placed on the miniaturization of near-eye display devices. Summary of the Invention

[0004] This application provides an optical waveguide assembly and a near-eye display device to improve the miniaturization of near-eye display devices.

[0005] In a first aspect, an optical waveguide assembly is provided, which includes a light guide, a galvanometer, and a polarizing beam splitter assembly; wherein the light guide has a total internal reflection surface disposed opposite to each other;

[0006] The polarizing beam splitter assembly is used to reflect light of the first polarization state and transmit light of the second polarization state, and the polarizing beam splitter assembly is also used to change the polarization state of light when propagating light. The polarizing beam splitter assembly includes a first surface, a second surface, and a third surface; the first surface faces the light guide, the second surface is perpendicular to the third surface, and the intersection of the second surface and the third surface or the intersection of the extension surface of the second surface and the third surface is located on the side of the first surface away from the light guide; the second surface and the third surface are respectively at a 45° angle to the first surface; The galvanometer is located on the outer side of the second surface; wherein, The width of the reflecting surface of the galvanometer and the width L1 of the corresponding second surface satisfy the following relationship: d tan(2β+2θ-90°)+d tan(90°-2β+2θ)+D≤L1; Where d is the vertical distance from the reflecting surface of the galvanometer to the second surface, D is the width of the reflecting surface, θ is the maximum reflection angle of the light reflected by the galvanometer, and β is the angle between the second surface and the third surface. The first light ray, which is perpendicularly incident into the polarizing beam splitter assembly through the third surface, is then reflected by the first surface to the second surface and transmitted to the galvanometer; the second light ray, reflected by the galvanometer, is incident into the polarizing beam splitter assembly through the second surface and, after its polarization state is changed by the polarizing beam splitter assembly, propagates into the light guide through total internal reflection. When a portion of the light rays located within the light guide illuminates the polarizing beam splitter assembly, the polarizing beam splitter assembly reflects the light rays.

[0007] In the above technical solution, the incident light is reflected to the galvanometer by the polarizing beam splitter assembly, and then the light reflected by the galvanometer is propagated into the light guide. The matching of the dimensions between the galvanometer and the polarizing beam splitter assembly ensures that the reflected light can be reflected into the light guide. In addition, by having the incident light and the reflected light enter from two different surfaces of the polarizing beam splitter assembly, the rationality of the component arrangement is improved, which helps to reduce the space occupied by the device and improves the miniaturization of the near-eye display device.

[0008] In one specific implementation, the length of the first surface satisfies the condition that a portion of the light rays after total internal reflection by the total internal reflection surface of the light guide are reflected only once by the polarizing beam splitter assembly.

[0009] In a specific feasible implementation, the length L2 of the first face satisfies:

[0010] in, The angle of total internal reflection when light is incident on the light guide is T, and the thickness of the light guide is T.

[0011] In one specific implementation, the cross-section of the polarizing beam splitter assembly is an isosceles right triangle or an isosceles trapezoid.

[0012] In one specific implementation, the polarizing beam splitter assembly includes a polarizing beam splitter, a first polarizer, and a second polarizer. The cross-sectional shape of the polarizing beam splitter is an isosceles right triangle; the first polarizer and the second polarizer are respectively attached to a right-angled surface and an inclined surface of the polarizing beam splitter. The first light beam is reflected by the polarizing beam splitter and then transmitted through the second polarizer. After passing through the second polarizer, the polarization state of the second light beam changes, and it is incident on the light guide through the first polarizer and undergoes total internal reflection.

[0013] In one specific implementation, both the first polarizer and the second polarizer are quarter-wave plates.

[0014] In one specific implementation, the polarizing beam splitter includes a polarizing beam splitter film, which is stacked with the first polarizer.

[0015] In one specific implementation, the polarizing beam splitter further includes a body, and the polarizing beam splitting film is disposed on the body; the refractive index of the body is approximately the same as that of the light guide.

[0016] In one specific implementation, the polarizing beam splitter assembly is bonded or adhesively connected to the light guide.

[0017] In a second aspect, a near-eye display device is provided, the near-eye display device including the optical waveguide component and laser described in any of the above claims; the laser emits the first light ray.

[0018] In the above technical solution, the incident light is reflected to the galvanometer by the polarizing beam splitter assembly, and then the light reflected by the galvanometer is propagated into the light guide. The matching of the dimensions between the galvanometer and the polarizing beam splitter assembly ensures that the reflected light can be reflected into the light guide. In addition, by having the incident light and the reflected light enter from two different surfaces of the polarizing beam splitter assembly, the rationality of the component arrangement is improved, which helps to reduce the space occupied by the device and improves the miniaturization of the near-eye display device.

[0019] In one specific implementation, the laser is located on the outside of the first surface. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating application scenarios of optical waveguide components in existing technologies; Figure 2 This is a schematic diagram of the structure of the optical waveguide component provided in the embodiments of this application; Figure 3 This is a reference diagram showing the usage state of the optical waveguide component provided in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of the polarization beam splitter assembly provided in the embodiments of this application. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] To facilitate understanding of the optical waveguide component provided in this application embodiment, its application scenarios will be explained first. The optical waveguide component provided in this application embodiment is applied to different near-eye display systems such as AR (Augmented Reality) or VR (Virtual Reality) to realize virtual display.

[0024] like Figure 1 As shown, Figure 1 A schematic diagram illustrating an application scenario of a prior art optical waveguide assembly is shown. The existing optical device includes a light guide 1, a light coupling module 2, a light coupling module 3, and a light generator 4. The light generator emits light to display an image. The light coupling module 2 couples the light emitted by the light generator 4 into the light guide 1. The light guide 1, used to propagate light, has two opposing total internal reflection surfaces, allowing light to propagate through total internal reflection. The light coupling module 3 couples the light from the light guide 1 into the user's pupil, enabling the user to observe the image displayed by the light generator. The optical waveguide assembly may also include a relay module to expand the user's viewing angle.

[0025] Current optical waveguide assemblies, with their galvanometers, lasers, and coupling modules occupying significant space, result in a large overall size for near-eye display devices. Therefore, this application provides an optical waveguide assembly to improve device layout, which will be described in detail below with reference to specific drawings and embodiments.

[0026] refer to Figure 2 As shown, Figure 2A schematic diagram of the optical waveguide assembly provided in this embodiment is shown. The optical waveguide assembly provided in this embodiment mainly includes a light guide 20, a polarizing beam splitter assembly 10, and a galvanometer 30. The light guide 20 can be a waveguide or a structure made of other transparent materials. The light guide 20 has two opposing surfaces (total internal reflection surfaces), allowing light to propagate through total internal reflection between the two surfaces.

[0027] The polarizing beam splitter assembly 10 is located outside the light guide 20 and is fixedly connected to the light guide 20. The polarizing beam splitter assembly 10 is used to couple light into the light guide 20 so that it propagates through total internal reflection within the light guide 20, and it can be equivalent to a coupling module.

[0028] When light propagates, the laser emitted by the laser is reflected by the polarizing beam splitter assembly 10 to the galvanometer 30, and the light reflected by the galvanometer 30 passes through the polarizing beam splitter assembly 10 and enters the light guide 20. When a portion of the light in the light guide 20 illuminates the polarizing beam splitter assembly 10, the polarizing beam splitter assembly 10 reflects the light.

[0029] In this embodiment of the application, the polarizing beam splitter assembly 10 can reflect light of a first polarization state and transmit light of a second polarization state. In addition, the polarizing beam splitter assembly 10 can also be used to change the polarization state of light when propagating light.

[0030] In a specific configuration, the polarizing beam splitter assembly 10 has three faces at an angle. For ease of description, the three faces are named the first face 102, the second face 101, and the third face, respectively. The third face of the polarizing beam splitter assembly 10 is attached to the light guide 20, while the first face 102 and the second face 101 are inclined relative to each other. The intersection or intersection of the extension surfaces of the first face 102 and the second face 101 is located on the side of the third face away from the light guide 20. For example, if the cross-sectional shape of the polarizing beam splitter assembly 10 is triangular, then the first face 102 and the second face 101 intersect on the side of the third face away from the light guide 20; if the cross-sectional shape of the polarizing beam splitter assembly 10 is trapezoidal, then the intersection of the extension surfaces of the first face 102 and the second face 101 is on the side of the third face away from the light guide 20. Of course, in addition to the triangle or trapezoidal shape in the above examples, the cross-section of the polarizing beam splitter assembly 10 can also be other shapes, which will not be illustrated here.

[0031] Furthermore, in this embodiment, the first surface 102 and the second surface 101 are perpendicular to each other, that is, the first surface 102 and the second surface 101 each form a 45° angle with the third surface. The first surface 102 is the incident surface of the light, and the second surface 101 is both the exit surface and the incident surface of the light. During light propagation, the first ray a, which is perpendicularly incident on the first surface 102, is reflected by the third surface to the second surface 101 and then exits. The second ray b, which is incident on the second surface 101, passes through the polarizing beam splitter assembly 10 and propagates through total internal reflection within the light guide 20. The second ray b is the reflected ray of the first ray a. Furthermore, the polarization state of the light can be changed by the polarizing beam splitter assembly 10 when the light passes through the second surface 101 twice.

[0032] When the polarizing beam splitter assembly 10 is in use, the galvanometer 30 is located outside the second surface 101.

[0033] d tan(2β+2θ-90°)+d tan(90°-2β+2θ)+D≤L1; The light reflected by the galvanometer 30 (second light b) can be incident on the polarizing beam splitter assembly 10 through the second surface 101.

[0034] To ensure the reliability of the optical waveguide assembly, during use, the width of the reflecting surface of the galvanometer 30 and the width L1 of the second surface 101 must satisfy the following: Where d is the vertical distance from the reflecting surface of the galvanometer 30 to the second surface 101, D is the width of the reflecting surface, θ is the maximum reflection angle of the light reflected by the galvanometer 30, and β is the angle between the second surface 101 and the first surface 102.

[0035] Please refer to the above. Figure 2 and Figure 3 As shown, in Figure 2 and Figure 3 In the polarizing beam splitter assembly 10 shown, the angle between the first surface 102 and the third surface is α, and the angle between the second surface 101 and the third surface is β. A first ray a is incident perpendicularly on the first surface 102, and the ray reflected by the polarizing beam splitter assembly 10 is incident perpendicularly on the galvanometer 30. The galvanometer 30 swings at different angles, and the angle of left and right swing of the galvanometer 30 is θ. Taking the position where the ray strikes the axis disturbed by the swing of the galvanometer 30 as an example, when the galvanometer 30 swings to its maximum angle to the left or right, the sum of the distances between the two extreme positions reflected to the second surface 101 and the axis of the galvanometer 30 is: d tan(2β+2θ-90°)+d tan(90°-2β+2θ), then satisfying: d tan(2β+2θ-90°)+d When tan(90°-2β+2θ)+D≤L1; it can be ensured that the light reflected by the galvanometer 30 can be incident into the polarizing beam splitter 11 through the second surface 101, and can be transmitted into the light guide 20 through the polarizing beam splitter assembly 10, thus ensuring that the reflected light can be reflected into the light guide 20.

[0036] During light propagation, the first ray a enters the polarizing beam splitter assembly 10 through the first surface 102, and is then reflected by the third surface to the second surface 101 and transmitted to the galvanometer 30; the second ray b reflected by the galvanometer 30 enters the polarizing beam splitter assembly 10 through the second surface 101 and, after its polarization state is changed by the polarizing beam splitter assembly 10, propagates into the light guide 20 through total internal reflection.

[0037] For ease of understanding, let's take the first polarization state of light as P-ray and the second polarization state of light as S-ray as an example. Figure 3 As shown, the P-beam (first ray a) emitted by the laser 40 is incident on the polarizing beam splitter assembly 10 from the first surface 102. The light beam located within the polarizing beam splitter assembly 10 is reflected by the third surface (the surface connecting the polarizing beam splitter assembly 10 and the light guide 20), exits the polarizing beam splitter assembly 10 through the second surface 101, and is incident on the galvanometer 30. The reflected light (second ray b) formed by the galvanometer 30 is reflected by the second surface 101 and is incident on the polarizing beam splitter assembly 10. After passing through the second surface 101 twice, the polarization state of the light beam can be changed by the polarizing beam splitter assembly 10, converting it from P-beam to S-beam. The S-beam can pass through the third surface and enter the light guide 20, where it undergoes total internal reflection. That is, the structure of the polarizing beam splitter assembly provided in this embodiment allows the transmission of S-beam and reflection of P-beam on the third surface, and the structure at the second surface 101 can change the polarization state of the light beam when it passes through twice.

[0038] Additionally, when a portion of the light rays located within the light guide 20 illuminates the polarizing beam splitter assembly 10, the assembly reflects the light. For example, when light rays illuminate the third surface, the structure at the third surface can also convert the S-ray into P-ray and perform total internal reflection, ensuring that the light rays propagate within the light guide 20 via total internal reflection. Of course, the laser 40 can also emit S-rays, and the corresponding polarizing beam splitter assembly 10 can convert the S-ray into P-ray and vice versa, a process similar to the laser 40 emitting P-rays in the example described above.

[0039] In the above technical solution, the incident light is reflected to the galvanometer 30 by the polarizing beam splitter assembly 10, and then the light reflected by the galvanometer 30 is propagated into the light guide 20. The matching of the dimensions of the galvanometer 30 and the polarizing beam splitter assembly 10 ensures that the reflected light can be reflected into the light guide 20. Furthermore, by having the incident and reflected light incident from two different surfaces of the polarizing beam splitter assembly 10, the rationality of the component arrangement is improved, which helps to reduce the space occupied by the device and improves the miniaturization of the near-eye display device.

[0040] It should be understood that the optical axis of the laser 40, the angle between the first surface 102, the second surface 101 and the third surface of the polarizing beam splitter assembly 10, and the arrangement of the galvanometer 30 should ensure that after the light is incident into the light guide 20, the incident angle between the light and the total internal reflection surface meets the requirements of total internal reflection.

[0041] In one specific feasible implementation, the galvanometer 30 and the light guide 20 satisfy the following: Where n is the refractive index of the waveguide.

[0042] Continue to refer to Figure 2 and Figure 3 As shown, when light propagates into the optical waveguide, the angle of incidence is... , To meet the requirement of total internal reflection, then For ease of understanding, a reference line H is introduced. H is the line parallel to the normal to the reflecting surface of the galvanometer 30 when the galvanometer 30 is parallel to the second surface 101. Figure 3 From the geometric relationships in the diagram, we can see that:

[0043]

[0044] but: In other words, the maximum incident angle reflected by the galvanometer 30 must satisfy the above formula to ensure that the light reflected by the galvanometer 30 can be totally internally reflected within the light guide 20.

[0045] In one specific implementation, when the reflecting surface of the galvanometer 30 is parallel to the corresponding surface (second surface 101), the light reflected by the polarizing beam splitter assembly 10 is incident perpendicularly onto the galvanometer 30. That is, when the cross-section of the polarizing beam splitter 11 is an isosceles right triangle, and the first ray a is incident perpendicularly onto the galvanometer 30, the light reflected by the polarizing beam splitter assembly 10 can be incident perpendicularly onto the galvanometer 30. Using this method simplifies the design and facilitates the design of near-eye display devices.

[0046] In one specific implementation scheme, the length of the third surface satisfies the condition that a portion of the light rays after total internal reflection by the total internal reflection surface of the light guide 20 are reflected only once by the polarizing beam splitter assembly 10. Combining this with the aforementioned structure of the polarizing beam splitter assembly 10, it can be seen that when the polarizing beam splitter assembly 10 is in use, when the light rays within the light guide 20 illuminate the first surface 102, the structure of the first surface 102 can convert the S-ray into P-ray and perform total internal reflection, thereby enabling the first surface 102 to reflect the light rays, ensuring that the light rays propagate within the light guide 20 through total internal reflection.

[0047] In a specific example, the length L2 of the third face satisfies: ;in, Let T be the angle of total internal reflection of light incident on the light guide 20, and T be the thickness of the light guide 20. That is, by limiting the length of the third surface, most of the light can be reflected only once on the third surface.

[0048] In an optional embodiment, the polarizing beam splitter assembly 10 provided in this application satisfies the following condition: the first light ray a incident on the first surface 102 is reflected by the third surface to the second surface 101 and then emitted perpendicularly. That is, when the first surface 102, the second surface 101 and the third surface of the polarizing beam splitter assembly 10 are arranged, the light emitted by the laser 40 should be refracted by the first surface 102 and then reflected by the third surface, so that the galvanometer 30 is distributed on both sides of the emitted light ray when vibrating, thereby reducing the size of the second surface 101 and the size of the polarizing beam splitter 11.

[0049] In one alternative design, the cross-section of the polarizing beam splitter assembly 10 is an isosceles right triangle. When using an isosceles right triangle, the two legs are located on the second face 101 and the first face 102, respectively, while the hypotenuse is located on the third face. This isosceles right triangle cross-section shape makes the entire polarizing beam splitter assembly 10 a symmetrical structure, which is easier to manufacture.

[0050] like Figure 3 and Figure 4As shown, in one specific embodiment, the polarizing beam splitter assembly 10 includes a polarizing beam splitter 11 and two polarizers, which are referred to as the first polarizer 13 and the second polarizer 12 for ease of description. The polarizing beam splitter 11 reflects light of a first polarization state and transmits light of a second polarization state, while the first polarizer 13 and the second polarizer 12 both change the polarization state of the light. For example, the polarizing beam splitter 11 has a polarizing beam splitter film 111, which reflects light of the first polarization state and transmits light of the second polarization state. Furthermore, when light passes through the first polarizer 13 or the second polarizer 12 twice, the polarization state of the light can be changed from the first polarization state to the second polarization state or vice versa.

[0051] During assembly, the cross-section of the polarizing beam splitter 11 is an isosceles right triangle. The first polarizer 13 and the second polarizer 12 are respectively attached to a right-angled surface and an inclined surface of the polarizing beam splitter 11. For example, the first polarizer 13 is stacked with the polarizing beam splitter film 111 and is located on the third surface of the polarizing beam splitter assembly 10, while the second polarizer 12 is located on the second surface 101 of the polarizing beam splitter assembly 10.

[0052] When light propagates, the first ray a is reflected by the polarizing beam splitter 11 and then passes through the second polarizer 12. The second ray b passes through the second polarizer 12, changes its polarization state, and then passes through the first polarizer 13 before entering the light guide 20 for total internal reflection. Specifically, taking the laser 40 emitting P-beams, the polarizing beam splitter 111 reflecting the P-beams and transmitting S-beams as an example: The P-beams emitted by the laser 40 (first ray a) are incident on the polarizing beam splitter 11 and, after refraction, are incident on the polarizing beam splitter 111. The P-beams located in the polarizing beam splitter 11 are reflected by the polarizing beam splitter 111 (still P-beams), pass through the second polarizer 12, and then enter the galvanometer 30. The galvanometer 30 reflects the ray, which passes through the second polarizer 12 again and enters the polarizing beam splitter 11. The P-beams pass through the second polarizer 12 twice, thus converting from P-beams to S-beams. S-beams, after passing through the polarizing beam splitter 111 and the first polarizer 13, are incident into the light guide 20 and undergo total internal reflection within the light guide 20. A portion of the S-beams within the light guide 20 is reflected by the total internal reflection surface to the first polarizer 13. After passing through the first polarizer 13, the S-beams are converted into P-beams after passing through the first polarizer 13 twice. The P-beams are then reflected back into the light guide 20 by the polarizing beam splitter 111, thus ensuring that the light propagates within the light guide 20 through total internal reflection.

[0053] Of course, laser 40 can also emit S-beams, and the corresponding polarizing beam splitter 11 can convert S-beams into P-beams and vice versa, in a process similar to that of laser 40 emitting P-beams in the example above.

[0054] In one alternative embodiment, both the first polarizer 13 and the second polarizer 12 provided in this application are quarter-wave plates. P-light is deflected into S-light after passing through the quarter-wave plate twice; similarly, S-light is deflected into P-light after passing through the quarter-wave plate twice.

[0055] In one specific implementation, the polarizing beam splitter 11 further includes a body 112, with the polarizing beam splitting film 111 disposed on the body 112; the refractive index of the body 112 is approximately the same as that of the light guide 20. When the refractive indices of the body 112 and the light guide 20 are approximately the same, the polarizing beam splitter 11 and the light guide 20 can be fabricated using the same or similar materials, facilitating their fabrication. Furthermore, when the cross-section of the polarizing beam splitter 11 is an isosceles right triangle, that is, when the shape of the body 112 is an isosceles right triangle...

[0056] In an optional embodiment, the polarizing beam splitter assembly 10 and the light guide 20 provided in this application can be connected in different ways, such as by bonding or other common methods. When using bonding, the connection strength between the polarizing beam splitter assembly 10 and the light guide 20 can be improved, and the amount of medium through which the light passes can be reduced.

[0057] This application embodiment also provides a near-eye display device, which includes an optical waveguide assembly, a laser 40, and a galvanometer 30 as described above; the laser 40 and the galvanometer 30 are arranged on the outside of the polarization beam splitter assembly 10.

[0058] In the above technical solution, the incident light is reflected to the galvanometer 30 by the polarizing beam splitter assembly 10, and then the light reflected by the galvanometer 30 is propagated into the light guide 20. The matching of the dimensions of the galvanometer 30 and the polarizing beam splitter assembly 10 ensures that the reflected light can be reflected into the light guide 20. Furthermore, by having the incident and reflected light incident from two different surfaces of the polarizing beam splitter assembly 10, the rationality of the component arrangement is improved, which helps to reduce the space occupied by the device and improves the miniaturization of the near-eye display device.

[0059] In one specific implementation, the laser 30 is located on the outer side of the first surface 102. See also [specific details]. Figure 2 and Figure 3 The relevant description in the document.

[0060] 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.

[0061] 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 component, characterized in that, It includes a light guide, a galvanometer, and a polarizing beam splitter assembly; wherein the light guide has opposingly arranged total internal reflection surfaces; The polarizing beam splitter assembly includes a first surface, a second surface, and a third surface; the first surface faces the light guide, the second surface is perpendicular to the third surface, and the intersection of the second surface and the third surface or the intersection of the extension surface of the second surface and the third surface is located on the side of the first surface away from the light guide. The galvanometer is located on the outer side of the second surface; wherein, The width of the reflecting surface of the galvanometer and the width L1 of the corresponding second surface satisfy the following relationship: d tan(2β+2θ-90°)+d tan(90°-2β+2θ)+D≤L1; Where d is the vertical distance from the reflecting surface of the galvanometer to the second surface, D is the width of the reflecting surface, θ is the maximum reflection angle of the light reflected by the galvanometer, and β is the angle between the second surface and the third surface. The first light ray, which is perpendicularly incident into the polarizing beam splitter assembly through the third surface, is then reflected by the first surface to the second surface and transmitted to the galvanometer; the second light ray, reflected by the galvanometer, is incident into the polarizing beam splitter assembly through the second surface and, after its polarization state is changed by the polarizing beam splitter assembly, propagates into the light guide through total internal reflection. When a portion of the light rays located within the light guide illuminates the polarizing beam splitter assembly, the polarizing beam splitter assembly reflects the light rays.

2. The optical waveguide assembly according to claim 1, characterized in that, The length of the first surface satisfies the condition that a portion of the light rays after total internal reflection by the total internal reflection surface of the light guide are reflected only once by the polarizing beam splitter assembly.

3. The optical waveguide assembly according to claim 2, characterized in that, The length L2 of the first face satisfies: ； in, The angle of total internal reflection when light is incident on the light guide is T, and the thickness of the light guide is T.

4. The optical waveguide assembly according to claim 1, characterized in that, The cross-section of the polarizing beam splitter assembly is an isosceles right triangle.

5. The optical waveguide assembly according to claim 4, characterized in that, The polarizing beam splitter assembly includes a polarizing beam splitter, a first polarizer, and a second polarizer; The cross-sectional shape of the polarizing beam splitter is an isosceles right triangle; the first polarizer and the second polarizer are respectively attached to a right-angled surface and an inclined surface of the polarizing beam splitter. The first light beam is reflected by the polarizing beam splitter and then transmitted through the second polarizer. After passing through the second polarizer, the polarization state of the second light beam changes, and it is incident on the light guide through the first polarizer and undergoes total internal reflection.

6. The optical waveguide assembly according to claim 5, characterized in that, Both the first polarizer and the second polarizer are quarter-wave plates.

7. The optical waveguide assembly according to claim 5, characterized in that, The polarizing beam splitter includes a polarizing beam splitter film, which is stacked with the first polarizer.

8. The optical waveguide assembly according to claim 7, characterized in that, The polarizing beam splitter also includes a body, and the polarizing beam splitting film is disposed on the body; the refractive index of the body is approximately the same as that of the light guide.

9. The optical waveguide assembly according to any one of claims 1 to 8, characterized in that, The polarizing beam splitter assembly is bonded or adhesively connected to the light guide.

10. A near-eye display device, characterized in that, It includes the optical waveguide assembly and laser as described in any one of claims 1 to 9; the laser emits the first light ray.

11. The near-eye display device according to claim 10, characterized in that, The laser is located on the outside of the first surface.

Images