Optical waveguide and AR device

Abstract

The utility model discloses an optical waveguide and AR equipment, and relates to the technical field of optical display, and the optical waveguide comprises a waveguide substrate, and a coupling-in region, a first coupling-out region and a second coupling-out region which are disposed on the waveguide substrate in a first direction. A first pupil expanding area and a second pupil expanding area are further arranged between the first coupling-out area and the second coupling-out area, a first preset included angle and a second preset included angle are formed between the extending direction of the first pupil expanding area and the first direction and between the extending direction of the second pupil expanding area and the first direction, and part of light beams projected to the first coupling-out area are coupled out through the first coupling-out area. The light beam which is not coupled out through the first coupling-out area is coupled out through the second coupling-out area after being expanded by the first pupil expanding area or the second pupil expanding area. According to the optical waveguide and the AR equipment provided by the invention, the coupling-in area is arranged at one side of the optical waveguide, so that the uniformity of the brightness of the output image of the corresponding binocular is improved while the middle of the AR equipment is prevented from protruding.

Description

Technical Field

[0001] The present application relates to the field of optical display technology, and in particular, to an optical waveguide and an AR device. Background Art

[0002] Augmented Reality (AR) technology is a technology that cleverly integrates virtual information with the real world. This head-mounted display using augmented reality technology allows people to project virtual images into the human eye while viewing the surrounding environment. Among them, diffraction optical waveguides are the more mainstream display solution for AR devices. Many AR devices use this display solution because diffraction optical waveguides have the advantages of being light and thin, having a large field of view, a large eye movement range, and low mass production costs. Therefore, they are generally considered to be the mainstream display technology route in the AR industry. If the diffraction optical waveguide is to guide the light beam emitted by the optical machine into the human eye, it needs to go through the process of coupling in and out. That is, the light beam emitted by the optical machine is coupled into the optical waveguide through the coupling-in area, and is fully reflected and propagated in it, and finally emitted from the coupling-out area into the human eye.

[0003] When the AR device is applied to both eyes, in order to reduce the weight and cost of the AR device, the symmetry of diffraction is used to set a coupling area and a coupling-out area on both sides of the coupling-in area on the optical waveguide. The light beams emitted from the two coupling-out areas reach one of the human eyes respectively. An optical machine is set for each coupling-in area, thereby reducing the number of optical machines and achieving the goal of reducing the weight and cost of the AR device. However, in the prior art single-coupling and double-coupling optical waveguide, the coupling-in area is located at the horizontal center of the optical waveguide and slightly above the vertical direction. The AR device formed by the single-coupling and double-coupling optical waveguide needs to set the optical machine in the middle of the AR device, so that the middle of the AR device has a convex structure. When the AR device is worn on the forehead, the convex structure interferes with the forehead, affecting the wearing experience of the AR device. If the optical machine is set separately on the side of the AR device, the existing grating structure makes the intensity of the light beam emitted by the coupling-out grating corresponding to the binocular eyes differ greatly, thereby making the brightness of the output image corresponding to the binocular eyes differ greatly. Therefore, the present application proposes a new single-sided entrance pupil structure to solve the above problems. Utility Model Content

[0004] The purpose of the present application is to provide an optical waveguide and an AR device, in which the coupling-in area is arranged on one side of the optical waveguide, thereby avoiding a bulge in the middle of the AR device and improving the uniformity of the brightness of the output image corresponding to the two eyes.

[0005] On the one hand, an embodiment of the present application provides an optical waveguide, including a waveguide substrate and a coupling-in region, a first coupling-out region, and a second coupling-out region arranged on the waveguide substrate along a first direction, a first pupil dilation region and a second pupil dilation region are further arranged between the first coupling-out region and the second coupling-out region, and the extension directions of the first pupil dilation region and the second pupil dilation region have a first preset angle and a second preset angle with the first direction, a part of the light beam projected to the first coupling-out region is coupled out by the first coupling-out region, and the light beam that is not coupled out through the first coupling-out region is coupled out by the second coupling-out region through the expansion of the first pupil dilation region or the second pupil dilation region.

[0006] As an implementable manner, a first outcoupling component is set in the first outcoupling area, and the first outcoupling component expands and couples the light beam in two directions. The light beam coupled in through the coupling-in area is expanded and coupled out in the first outcoupling component, and a one-dimensional grating is set in the first pupil expansion area, the second pupil expansion area and the second outcoupling area.

[0007] As an implementable manner, the first outcoupling component includes a two-dimensional grating, or the first outcoupling component includes two one-dimensional gratings correspondingly arranged on two side surfaces of the waveguide substrate.

[0008] As an implementable manner, the two expansion directions of the light beam by the first outcoupling component are respectively the same as the expansion directions of the first pupil expansion area and the second pupil expansion area.

[0009] As an implementable method, a first outcoupling grating is set in the first outcoupling region, and the first outcoupling grating is a one-dimensional grating. A third pupil expansion region is also set between the coupling region and the first outcoupling region. The light beam coupled in through the coupling region is expanded in the third pupil expansion region and then enters the first outcoupling grating.

[0010] As an implementable manner, the grating directions of the one-dimensional gratings in the first pupil expansion area and the second pupil expansion area have a preset angle, and the preset angle is between 90° and 140°.

[0011] As an implementable manner, the first pupil expansion area and the second pupil expansion area are cross-arranged, and in a first direction, projections of the first pupil expansion area and the second pupil expansion area both cover projections of the second outcoupling area.

[0012] As an implementable manner, a two-dimensional grating is formed in the overlapping area of ​​the first pupil expansion area and the second pupil expansion area.

[0013] As an implementable manner, the gratings in the coupling-in region, the first coupling-out region, the second coupling-out region, the first pupil expansion region, and the second pupil expansion region are all one of surface relief gratings and volume holographic gratings.

[0014] On the other hand, an embodiment of the present application provides an AR device, including an optical machine and the above-mentioned optical waveguide arranged on the light output side of the optical machine, the image light beam emitted by the optical machine is coupled in by the coupling-in region of the optical waveguide, and is coupled out by the first coupling-out region and the second coupling-out region of the optical waveguide.

[0015] The beneficial effects of the embodiments of the present application include:

[0016] The optical waveguide provided by the present application includes a waveguide substrate and a coupling-in region, a first coupling-out region, and a second coupling-out region arranged on the waveguide substrate along a first direction. When the optical waveguide is applied to an AR device, the first coupling-out region and the second coupling-out region correspond to binoculars respectively, so that the coupling-in region is located on one side of the AR device. A first pupil dilation region and a second pupil dilation region are further arranged between the first coupling-out region and the second coupling-out region. The extension directions of the first pupil dilation region and the second pupil dilation region have a first preset angle and a second preset angle with the first direction. Part of the light beam of the first coupling-out region is coupled out by the first coupling-out region, and the light beam that is not coupled out through the first coupling-out region is coupled out by the second coupling-out region through the expansion of the first pupil dilation region or the second pupil dilation region. The light beams coupled out of the first coupling-out region and the second coupling-out region are imaged in front of the binoculars to realize binocular imaging. By setting the first pupil dilation region and the second pupil dilation region and setting the coupling-out efficiency of the first coupling-out region, the coupling-in region is located on one side of the optical waveguide, while ensuring that the brightness of the binocular imaging is consistent, and there will not be too much efficiency difference. When the optical waveguide is applied to an AR device, the optical engine and the coupling area are set so that the optical engine is located on one side of the AR device, avoiding the bulge in the middle of the AR device and interfering with the forehead, thereby improving the wearing experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 One of the structural schematic diagrams of an optical waveguide provided in an embodiment of the present application;

[0019] Figure 2 A light path diagram of an optical waveguide provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the structure of an AR device provided in an embodiment of the present application;

[0021] Figure 4 A second schematic diagram of the structure of an optical waveguide provided in an embodiment of the present application;

[0022] Figure 5 One of the wave vector diagrams in an optical waveguide provided in an embodiment of the present application;

[0023] Figure 6 A second wave vector diagram in an optical waveguide provided in an embodiment of the present application;

[0024] Figure 7 A third wave vector diagram of an optical waveguide provided in an embodiment of the present application;

[0025] Figure 8 The third structural schematic diagram of an optical waveguide provided in an embodiment of the present application.

[0026] Icon: 100 - optical waveguide; 110 - waveguide substrate; 10 - coupling-in region; 20 - first coupling-out region; 30 - first pupil dilation region; 40 - second pupil dilation region; 50 - second coupling-out region; 60 - third pupil dilation region; 210 - optical machine. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of this application, it should be noted that the terms "center", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] An embodiment of the present application provides an optical waveguide 100, including a waveguide substrate 110 and a coupling-in region 10, a first coupling-out region 20, and a second coupling-out region 50 arranged on the waveguide substrate 110 along a first direction, wherein a first pupil dilation region 30 and a second pupil dilation region 40 are further arranged between the first coupling-out region 20 and the second coupling-out region 50, and the extension directions of the first pupil dilation region 30 and the second pupil dilation region 40 have a first preset angle and a second preset angle with the first direction, and the coupling-out efficiency of the first coupling-out region 20 is less than 50% so that part of the light beam projected onto the first coupling-out region 20 is coupled out by the first coupling-out region 20, and the light beam that is not coupled out through the first coupling-out region 20 is coupled out by the second coupling-out region 50 through the expansion of the first pupil dilation region 30 or the second pupil dilation region 40.

[0032] The optical waveguide 100 of the embodiment of the present application is applied to a binocular AR device. Corresponding to the binocular, a first outcoupling region 20 and a second outcoupling region 50 are arranged on the waveguide substrate 110, wherein the coupling region 10, the first outcoupling region 20 and the second outcoupling region 50 are arranged on the waveguide substrate 110 along a first direction. When the AR device is worn on both eyes, the first direction is the connecting line of the binoculars. In addition, the optical waveguide 100 of the embodiment of the present application is provided with a first pupil expansion region 30 and a second pupil expansion region 40 between the first outcoupling region 20 and the second outcoupling region 50, and the outcoupling efficiency of the first outcoupling region 20 is set to be less than 50%. In this way, Figure 2 As shown, the light beam is coupled into the waveguide substrate 110 from the coupling-in region 10, and propagates in the waveguide substrate 110 to the first coupling-out region 20, and is partially coupled out at the first coupling-out region 20. The light beam that has not been coupled out from the first coupling-out region 20 continues to propagate by total reflection in the optical waveguide 100 until it is projected to the first pupil dilation region 30 and the second pupil dilation region 40. The second pupil dilation region 40 expands the light beam and emits it to the second coupling-out region 50 after turning, and is coupled out from the second coupling-out region 50. The light beam coupled out from the first coupling-out region 20 forms an image at one eye, and the light beam coupled out from the second coupling-out region 50 forms an image at the other eye, so as to form a binocular AR device. Specifically, the distance between the center of the first coupling-out region 20 and the second coupling-out region is between 56 mm and 70 mm, so as to match the distance between the pupils of the human eye.

[0033] Specifically, the embodiment of the present application sets the coupling efficiency of the first coupling area 20 to be less than 50%, so that the intensity of the partial light beam coupled out by the first coupling area 20 is equivalent to the intensity of the light beam coupled out by the second coupling area 50. Since the first coupling area 20 and the second coupling area 50 respectively correspond to one of the binocular eyes, the brightness of the image seen by the binocular eyes is consistent.

[0034] In the embodiment of the present application, the coupling-in region 10 is located on one side of the optical waveguide 100 by setting the first pupil expansion region 30 and the second pupil expansion region 40 and setting the coupling-out efficiency of the first coupling-out region 20. When the optical waveguide 100 is applied to an AR device, the optical machine 210 is set with the coupling-in region 10, so that the optical machine 210 is located on one side of the AR device, thereby avoiding the bulge in the middle of the AR device and interfering with the forehead, thereby improving the wearing experience.

[0035] In the waveguide substrate 110, there are two output light beams, one of which is a light beam coupled out from the first outcoupling region 20, and the other is a light beam coupled out from the second outcoupling region 50. The K-space diagram of the light beam coupled out from the first outcoupling region 20 is: Figure 5 As shown, K space refers to the wave vector space, Figure 5 The K space shown is divided into two medium planes, n1 and n2, where n1 and n2 represent the refractive index outside the waveguide substrate 110 and the waveguide substrate 110, respectively. The space inside the small circle represents the space with a refractive index of n1, which is usually air, and the space between the large circle and the small circle represents the space with a refractive index of n2. The light beam propagates in the two medium planes. If it exceeds the space of the large circle, it means that the light beam leaks from the waveguide substrate 110 or does not exist. Figure 5 The square frame in the figure represents the projection of the light field in the K space. The state of the light beam when it propagates from the outside of the waveguide substrate 110 to the coupling-in region 10 is frame 1. After diffraction in the coupling-in region 10, it is coupled into the waveguide substrate 110 for total reflection propagation. The projection of the light field in the K space at this time is frame 2. After multiple total reflection propagations, it touches the first coupling-out region 20 and diffracts. Figure 5 The first outcoupling region 20 in the image is a two-dimensional grating region. Therefore, the projection of the light field in the K space quickly experiences a process of moving from box 2 to box 3 and then back to box 1, that is, the final input and output wave vector directions are consistent. The reason for this design is to ensure that the final output light beam does not produce serious dispersion.

[0036] The K-space diagram of the light beam coupled out by the second coupling region 50 is: Figure 6 As shown, similar to the above, the light beam is coupled into the waveguide substrate 110 from the coupling region 10 to form frame 2, and then part of the light beam touches the first pupil expansion region 30, and part of the light beam touches the second pupil expansion region 40, thus forming frames 3 and 4 respectively, and finally the above light beams are all propagated to the second coupling region 50, and are diffracted and coupled out of the waveguide substrate 110 through the second coupling region 50 to generate a second image. In the K space, it is shown that frame 3 and frame 4 return to frame 1, forming a closed loop in the K space.

[0037] During the propagation of the light beam, the first pupil dilation area 30 and the second pupil dilation area 40 can realize pupil dilation at the same time. Since the first pupil dilation area 30 and the second pupil dilation area 40 have a first preset angle and a second preset angle with the first direction, the first pupil dilation area 30 and the second pupil dilation area 40 can also guide more light beams to the second outcoupling area 50.

[0038] Among them, the specific angles of the first preset angle and the second preset angle are not limited in the embodiment of the present application, and those skilled in the art can set them according to actual conditions.

[0039] In addition, the specific material of the waveguide substrate 110 is not limited in the embodiment of the present application. For example, it can be made of glass or resin material, because glass or resin has a certain refractive index and good optical properties, which can provide good conditions for the propagation of light beams.

[0040] The specific structure of the grating in the second outcoupling region is not limited in the present embodiment, and can be exemplified as follows: Figure 1 The one-dimensional grating shown can also be Figure 8 The two-dimensional grating shown.

[0041] The optical waveguide 100 provided in the present application includes a waveguide substrate 110 and a coupling-in region 10, a first coupling-out region 20, and a second coupling-out region 50 arranged on the waveguide substrate 110 along a first direction. When the optical waveguide 100 is applied to an AR device, the first coupling-out region 20 and the second coupling-out region 50 correspond to the binoculars respectively, so that the coupling-in region 10 is located on one side of the AR device, and a first pupil dilation region 30 and a second pupil dilation region 40 are further arranged between the first coupling-out region 20 and the second coupling-out region 50. The extension directions of the first pupil dilation region 30 and the second pupil dilation region 40 have a first preset angle and a second preset angle with the first direction, and the coupling-out efficiency of the first coupling-out region 20 is less than 50% so that part of the light beam projected to the first coupling-out region 20 is emitted by the first coupling-out region 2 0 coupling, the light beam that is not coupled out through the first coupling area 20 is coupled out through the expansion of the first pupil expansion area 30 or the second pupil expansion area 40 by the second coupling area 50, and the light beams coupled out of the first coupling area 20 and the second coupling area 50 are imaged in front of the binocular eyes to achieve binocular imaging. By setting the first pupil expansion area 30 and the second pupil expansion area 40 and setting the coupling efficiency of the first coupling area 20, the coupling area 10 is located on one side of the optical waveguide 100, while ensuring the brightness suppression of binocular imaging, and will not produce too much efficiency difference. When the optical waveguide 100 is applied to an AR device, the optical machine 210 is set with the coupling area 10, so that the optical machine 210 is located on one side of the AR device, avoiding the bulge in the middle of the AR device and interfering with the forehead, thereby improving the wearing experience.

[0042] Optional, such as Figure 1 and Figure 2 As shown, the first outcoupling region 20 is provided with a first outcoupling component, and the first outcoupling component expands and outcouples the light beam in two directions. The light beam coupled in through the coupling region 10 is expanded and outcoupled in the first outcoupling component, and the first pupil expansion region 30, the second pupil expansion region 40 and the second outcoupling region 50 are provided with a one-dimensional grating.

[0043] The first outcoupling component expands the light beam in two directions, so that the light beam emitted by the first outcoupling component has a larger viewing angle, which is convenient for viewing and improves the viewing experience.

[0044] In one possible implementation of the embodiment of the present application, Figure 2 As shown, the first outcoupling component includes a two-dimensional grating, or the first outcoupling component includes two one-dimensional gratings correspondingly arranged on two sides of the waveguide substrate 110 .

[0045] When the first coupling-out component is a two-dimensional grating, the two-dimensional grating is located on one side of the waveguide substrate 110, and the two-dimensional grating has fewer processing steps. The angle between the two gratings in the two-dimensional grating is not limited in the present embodiment, and can be 45°, 90°, etc.

[0046] When the first outcoupling component is a two-dimensional grating, the K-space diagram of the light beam outcoupled by the first outcoupling region 20 is: Figure 7 As shown, after coupling through the coupling region 10, the projection of the light field in the K space is transferred from frame 1 to frame 2, and then propagates to the first decoupling region 20. The first decoupling region 20 is provided with gratings in two directions. Some light beams touch the first direction first, and some light beams touch the second direction first, so they appear as two paths in the K space.

[0047] The two one-dimensional gratings on the two sides refer to that one-dimensional gratings are respectively arranged on the two sides, and the projections of the one-dimensional gratings on the surface of the waveguide substrate 110 overlap. Compared with two-dimensional gratings, one-dimensional gratings have high manufacturing accuracy, are easier to prepare, and have a higher yield.

[0048] Optional, such as Figure 1 and Figure 2 As shown, the two expansion directions of the light beam by the first outcoupling component are respectively the same as the expansion directions of the first pupil expansion area 30 and the second pupil expansion area 40 .

[0049] The two expansion directions of the light beam by the first outcoupling component are respectively the same as the expansion directions of the first pupil expansion area 30 and the second pupil expansion area 40, so that the expansion directions of the light beams coupled out of the first outcoupling area 20 and the second outcoupling area 50 are the same, so that the field of view angles of the images formed at the binoculars are equal.

[0050] In one possible implementation of the embodiment of the present application, Figure 4As shown, a first outcoupling grating is set in the first outcoupling region 20, and the first outcoupling grating is a one-dimensional grating. A third pupil expansion region 60 is also set between the coupling region 10 and the first outcoupling region 20. The light beam coupled through the coupling region 10 is expanded by the third pupil expansion region 60 and then enters the first outcoupling grating.

[0051] When a one-dimensional grating is set in the first out-coupling region 20, in order to achieve the expansion of the light beam, a third pupil expansion region 60 is set between the coupling region 10 and the first out-coupling region 20. The light beam is coupled into the waveguide substrate 110 from the coupling region 10, and enters the third pupil expansion region 60 after multiple total reflection propagation. The third pupil expansion region 60 guides the light beam to the first out-coupling region 20, and part of the light beam is coupled out of the waveguide substrate 110 from the first out-coupling region 20 to form an output image. Part of the light beam continues to propagate to the first pupil expansion region 30 and the second pupil expansion region 40. The first pupil expansion region 30 and the second pupil expansion region 40 guide the light beam to the second out-coupling region 50, and the light beam is coupled out of the waveguide substrate 110 from the second out-coupling region 50 to form an image.

[0052] Optional, such as Figure 1 and Figure 2 As shown, the grating directions of the one-dimensional gratings in the first pupil expansion area 30 and the second pupil expansion area 40 have a preset angle, and the preset angle is between 90° and 140°.

[0053] In one achievable manner of the embodiment of the present application, the first pupil expansion area 30 and the second pupil expansion area 40 are cross-arranged, and in the first direction, the projections of the first pupil expansion area 30 and the second pupil expansion area 40 both cover the projection of the second outcoupling area 50 .

[0054] The projections of the first pupil expansion area 30 and the second pupil expansion area 40 both cover the projection of the second outcoupling area 50, so that the first pupil expansion area 30 and the second pupil expansion area 40 are larger, and more light beams can be guided to the second outcoupling area 50, thereby improving the outcoupling efficiency.

[0055] Optionally, a two-dimensional grating is formed in the overlapping area of ​​the first pupil expansion area 30 and the second pupil expansion area 40.

[0056] In one achievable manner of the embodiment of the present application, the gratings in the coupling-in region 10, the first coupling-out region 20, the second coupling-out region 50, the first pupil expansion region 30 and the second pupil expansion region 40 are all one of a surface relief grating and a volume holographic grating.

[0057] Among them, the holographic grating is the interference of two beams with specific wavefront shapes, forming interference fringes of alternating light and dark on the recording plane. The interference fringes are recorded with a holographic recording medium, and the holographic grating is obtained after processing. The volume holographic grating is formed after multiple exposures. In other words, the volume holographic grating can be understood as multiple holographic gratings integrated in the same holographic material, which has the advantage of a simple preparation method.

[0058] The surface relief grating is amplitude modulated, including vertical surface relief grating and inclined surface relief grating. The surface relief grating has the advantages of extremely high design freedom and relatively mature technology. Specifically, the surface relief grating is made by nanoimprinting preparation process. Those skilled in the art can select the type of grating according to actual conditions.

[0059] The present application also discloses an AR device, such as Figure 3 As shown, it includes an optical machine 210 and the above-mentioned optical waveguide 100 arranged on the light-emitting side of the optical machine 210. The image light beam emitted by the optical machine 210 is coupled in by the coupling-in region 10 of the optical waveguide 100, and coupled out by the first coupling-out region 20 and the second coupling-out region 50 of the optical waveguide 100. The AR device includes the same structure and beneficial effects as the optical waveguide 100 in the aforementioned embodiment. The structure and beneficial effects of the optical waveguide 100 have been described in detail in the aforementioned embodiment, and will not be repeated here.

[0060] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical waveguide, characterized in that: The invention comprises a waveguide substrate and a coupling-in region, a first coupling-out region and a second coupling-out region arranged on the waveguide substrate along a first direction, a first pupil dilation region and a second pupil dilation region are further arranged between the first coupling-out region and the second coupling-out region, the extension directions of the first pupil dilation region and the second pupil dilation region have a first preset angle and a second preset angle with the first direction, a part of the light beam projected to the first coupling-out region is coupled out by the first coupling-out region, and a light beam that is not coupled out by the first coupling-out region is coupled out by the second coupling-out region through the expansion of the first pupil dilation region or the second pupil dilation region.

2. The optical waveguide according to claim 1, characterized in that A first out-coupling component is arranged in the first out-coupling area, and the first out-coupling component expands and couples out the light beam in two directions. The light beam coupled in through the coupling-in area is expanded and coupled out in the first out-coupling component. A one-dimensional grating is arranged in the first pupil expansion area, the second pupil expansion area and the second out-coupling area.

3. The optical waveguide according to claim 2, characterized in that The first outcoupling component includes a two-dimensional grating, or the first outcoupling component includes two one-dimensional gratings correspondingly arranged on two side surfaces of the waveguide substrate.

4. The optical waveguide according to claim 2, characterized in that The two expansion directions of the light beam by the first outcoupling component are respectively the same as the expansion directions of the first pupil expansion area and the second pupil expansion area.

5. The optical waveguide according to claim 1, characterized in that A first outcoupling grating is arranged in the first outcoupling region, and the first outcoupling grating is a one-dimensional grating. A third pupil expansion region is arranged between the coupling-in region and the first outcoupling region, and the light beam coupled in through the coupling-in region is expanded in the third pupil expansion region and then enters the first outcoupling grating.

6. The optical waveguide according to claim 2 or 5, characterized in that The grating directions of the one-dimensional gratings in the first pupil expansion area and the second pupil expansion area have a preset angle, and the preset angle is between 90° and 140°.

7. The optical waveguide according to claim 1, characterized in that The first pupil expansion area and the second pupil expansion area are cross-arranged, and in a first direction, projections of the first pupil expansion area and the second pupil expansion area both cover the projection of the second outcoupling area.

8. The optical waveguide according to claim 7, characterized in that A two-dimensional grating is formed in the overlapping area of ​​the first pupil expansion area and the second pupil expansion area.

9. The optical waveguide according to claim 1, characterized in that The gratings in the coupling-in region, the first coupling-out region, the second coupling-out region, the first pupil expansion region, and the second pupil expansion region are all one of surface relief gratings and volume holographic gratings.

10. An AR device, characterized in that: It comprises an optical machine and an optical waveguide as described in any one of claims 1 to 9 arranged on the light-emitting side of the optical machine, wherein the image light beam emitted by the optical machine is coupled in by a coupling-in region of the optical waveguide and coupled out by a first coupling-out region and a second coupling-out region of the optical waveguide.

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