An AR device
By setting a positioning structure on the optical waveguide substrate, the problem of low positioning accuracy in the coupling area between the optomechanical system and the optical waveguide is solved, achieving efficient optical coupling and good imaging effect, while reducing the size of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HISENSE VISUAL TECH CO LTD
- Filing Date
- 2025-07-07
- Publication Date
- 2026-07-24
AI Technical Summary
In existing AR devices, the positioning accuracy of the optomechanical system and the optical waveguide coupling area is not high, which affects the optical coupling effect and imaging quality.
A positioning structure is set on the optical waveguide substrate. Through the cooperation of positioning gratings and positioning posts, high-precision mechanical assembly of optomechanical components and optical waveguide substrate is achieved, ensuring optical path alignment accuracy.
It improves the optical path alignment accuracy between the optomechanical components and the optical waveguide substrate, ensuring efficient optical coupling and good imaging results, while reducing the size of the equipment and achieving overall lightweight design.
Smart Images
Figure CN224553591U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display device technology, and in particular to an AR device. Background Technology
[0002] Augmented Reality (AR) devices are wearable products designed to enhance the experience of reality, and can be used in numerous fields such as entertainment, education, and industry. AR devices provide users with an immersive experience by combining virtual information with the real world. In related technologies, AR devices use an optomechanical system to couple an imaging beam into the coupling region of an optical waveguide. The image beam propagates within the waveguide and exits from the coupling region, transmitting the image beam to the user's eyes, thereby forming an image within the user's eyeball.
[0003] Therefore, achieving precise positioning of the optomechanical system and the optical waveguide coupling region is crucial for ensuring efficient optical coupling and good imaging quality. Utility Model Content
[0004] The purpose of this application is to provide an AR device that addresses the problem of low positioning accuracy between the optomechanical system and the optical waveguide coupling area in existing AR devices.
[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0006] This application provides an AR device, including:
[0007] Optical waveguide substrate; the optical waveguide substrate has a coupling-in region and a coupling-out region;
[0008] Optomechanical components for propagating a light beam into the coupling region;
[0009] The positioning component includes a positioning structure disposed on the optical waveguide substrate and a corresponding positioning mating structure disposed on the optomechanical component; the positioning structure is located around the coupling region, and the positioning mating structure is used to position and mate with the positioning structure to limit the position of the optomechanical component and the optical waveguide substrate.
[0010] In some embodiments, the positioning structure includes a ring of positioning gratings disposed on the outer periphery of the coupling region, the positioning gratings including periodically arranged grooves and protrusions; the positioning mating structure correspondingly includes a ring of periodically arranged positioning posts, the positioning posts being used to embed into the grooves.
[0011] In some embodiments, the width of the groove of the positioning grating is in the range of 1 to 1000 μm, and the width of the positioning post is correspondingly set to be in the range of 1 to 1000 μm;
[0012] In some embodiments, the depth range of the groove of the positioning grating is 1 to 1000 μm, and the depth range of the positioning post is correspondingly set to 1 to 1000 μm.
[0013] In some embodiments, the positioning grating is made of a colloid used for imprinting onto the optical waveguide substrate.
[0014] In some embodiments, the outer periphery of the coupling region is circular, and the positioning grating surrounds the coupling region with the center of the circle as the center.
[0015] In some embodiments, the optomechanical assembly includes a substrate and a lens disposed within the substrate, with a plurality of positioning posts arranged periodically around the center of the lens.
[0016] In some embodiments, the lens is a metalens.
[0017] In some embodiments, both the positioning structure and the positioning mating structure are light-transmitting.
[0018] In some embodiments, the positioning post is any one of a prism, cylinder, or cubic prism; the groove structure of the positioning grating is adapted to the positioning post.
[0019] In some embodiments, the optical waveguide substrate has a plurality of coupling-in regions and a plurality of coupling-out regions, and each coupling-in region is provided with a positioning grating on its outer periphery; the number of the optomechanical components is plurality of, and each optomechanical component is provided with a positioning post arranged periodically at a position corresponding to the optical waveguide substrate.
[0020] The beneficial effects of the AR device of this application are as follows: This application sets a positioning structure on the optical waveguide substrate. The positioning structure has high mechanical processing precision to be formed on the optical waveguide substrate. Furthermore, the positioning structure is located around the coupling region, which helps to improve the mechanical assembly precision between the optical waveguide substrate and the optomechanical components, resulting in high optical path alignment precision between the optomechanical components and the optical waveguide substrate, ensuring efficient optical coupling and good imaging effects. Consequently, the optomechanical components can be directly positioned and mated with the surface of the optical waveguide substrate. The positioning structure occupies little space, which can significantly reduce the size of the device and achieve overall lightweight design. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the front structure of the optical waveguide substrate of an AR device provided in an embodiment of this application;
[0023] Figure 2 This is a schematic diagram of the structure of the AR device optical waveguide substrate and optomechanical components provided in an embodiment of this application;
[0024] Figure 3 This is a schematic diagram of the structure of a local coupling region of an optical waveguide substrate provided in an embodiment of this application;
[0025] Figure 4 This is a schematic diagram of the structure of an optomechanical component provided in an embodiment of this application;
[0026] Figure 5 This is a partial structural schematic diagram of an optical waveguide substrate provided in an embodiment of this application; wherein the optical waveguide substrate has multiple coupling-in regions and multiple coupling-out regions.
[0027] The following are the labeling elements in the figure:
[0028] 1. Optical waveguide substrate; 110. Coupled-in region; 120. Coupled-out region;
[0029] 2. Optomechanical components; 21. Matrix; 210. Superlens; 220. Display components;
[0030] 3. Positioning components;
[0031] 31. Positioning structure; 311. Groove; 312. Protrusion;
[0032] 32. Positioning and fitting structure; 321. Positioning column. Detailed Implementation
[0033] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.
[0034] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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 orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0037] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0038] Augmented Reality (AR) devices are wearable products designed to enhance the experience of reality, applicable to numerous fields such as entertainment, education, and industry. AR devices provide users with an immersive experience by combining virtual information with the real world. In related technologies, AR devices use an optomechanical system to couple an imaging beam into the coupling region of an optical waveguide. The image beam propagates within the waveguide and exits through the coupling region, transmitting the image beam to the user's eye, thus forming an image within the user's eyeball. Some existing devices employ positioning structures between the frame of the optomechanical component and the frame supporting the optical waveguide. Insufficient precision in positioning leads to poor optical coupling, affecting image quality.
[0039] Based on this, the positioning structure of this application is disposed on the surface of the optical waveguide substrate and located around the coupling region, possessing high machining precision. This facilitates improved mechanical assembly precision between the optical waveguide substrate and the optomechanical components, resulting in high optical path alignment accuracy between the optomechanical components and the optical waveguide substrate, ensuring efficient optical coupling and excellent imaging performance. Furthermore, the direct positioning and mating between the surface of the optical waveguide substrate and the optomechanical components significantly reduces the size of the equipment, achieving overall lightweight design.
[0040] refer to Figure 1 , Figure 2 and Figure 3 The application provides an AR device, including an optical waveguide substrate 1, an optomechanical component 2, and a positioning component 3; the optical waveguide substrate 1 has a coupling-in region 110 and a coupling-out region 120; the optomechanical component 2 is used to propagate a light beam into the coupling-in region 110; the positioning component 3 includes a positioning structure 31 disposed on the optical waveguide substrate 1 and a corresponding positioning mating structure 32 disposed on the optomechanical component 2, the positioning structure 31 being located around the coupling-in region 110, and the positioning mating structure 32 being used for positioning and mating with the positioning structure 31.
[0041] Understandably, the AR device of this application is based on Augmented Reality (AR) technology. Specifically, the AR device can be an augmented reality or virtual reality device, such as augmented reality or virtual reality glasses. The AR device provides users with an immersive experience by combining virtual information with the real world. The optomechanical component 2 is used to emit an image beam, and the optical waveguide substrate 1 is used to guide the image beam to propagate therein. The coupling region 110 of the optical waveguide substrate 1 is the entrance that couples the image beam emitted by the optomechanical component 2 into the optical waveguide substrate 1; the coupling region 120 couples the image beam out of the optical waveguide substrate 1 to transmit the image beam to the user's eye, thereby forming an image within the user's eyeball.
[0042] Specifically, by setting a positioning structure 31 on the optical waveguide substrate 1, and a corresponding positioning and mating structure 32 on the optomechanical assembly 2, the positioning structure 31 forms a positioning geometric mark on the optical waveguide substrate 1, and the positioning and mating structure 32 on the optomechanical assembly 2 achieves positioning by aligning with the positioning structure 31, thereby improving the optical path alignment accuracy between the optomechanical assembly 2 and the optical waveguide substrate 1, and compensating for optical path offset or deformation caused by errors in the assembly process between the optical waveguide substrate 1 and the optomechanical assembly 2.
[0043] For example, the positioning mark formed by the positioning structure 31 can be any of the following: a ring, a cross, an L-shape, or a T-shape; one of the positioning structure 31 and the positioning mating structure 32 can be designed as a groove structure, a hole structure, etc., and the other of the positioning structure 31 and the positioning mating structure 32 is set as a physical positioning structure.
[0044] The positioning structure 31 of this application is disposed on the surface of the optical waveguide substrate 1 and located around the coupling region 110. The positioning structure 31 has high machining accuracy to be formed on the optical waveguide substrate 1. It is beneficial to improve the mechanical assembly accuracy between the optical waveguide substrate 1 and the optomechanical component 2, so that the optical path alignment accuracy between the optomechanical component 2 and the optical waveguide substrate 1 is high, ensuring efficient optical coupling and good imaging effect.
[0045] Furthermore, the surface of the optical waveguide substrate 1 is directly positioned and matched with the optomechanical component 2. Compared with the existing technology of setting a positioning structure on the frame of the AR device, the positioning structure 31 occupies less space, which can significantly reduce the size of the device and achieve overall lightweighting.
[0046] refer to Figure 1 and Figure 3 In some embodiments, the positioning structure 31 includes a ring of positioning gratings 310 disposed on the outer periphery of the coupling region 110; the positioning gratings 310 include grooves 311 and protrusions 312 arranged periodically; the positioning mating structure 32 includes a ring of positioning posts 321 arranged periodically, the positioning posts 321 being used for positioning mating with the grooves 311.
[0047] Specifically, along the outer periphery of the coupling region 110, the positioning grating 310 has a specific structure of a ring of periodically arranged grooves 311 and protrusions 312, that is, the positioning grating 310 is arranged around the coupling region 110; correspondingly, a ring of periodically arranged positioning posts 321 is arranged on the optomechanical assembly 2. When the optomechanical assembly 2 is assembled with the optical waveguide substrate 1, along the emission direction of the beam from the optomechanical assembly 2, each positioning post 321 on the optomechanical assembly 2 is embedded in each groove 311 of the positioning grating 310 to achieve positioning and matching between the two, thereby achieving 360° omnidirectional alignment, effectively restricting the degrees of freedom, maintaining high mechanical positioning accuracy between the optical waveguide substrate 1 and the optomechanical assembly 2, and ensuring efficient optical coupling and high-quality imaging effect.
[0048] For example, the structure of the positioning post 321 can be a prism, cylinder, cubic prism, etc., and the structure of the groove 311 of the positioning grating 310 is adapted to the positioning post 321.
[0049] In some embodiments, the width of the groove 311 of the positioning grating 310 is in the range of 1 to 1000 μm, and the width of the positioning post 321 is correspondingly set to be in the range of 1 to 1000 μm.
[0050] In some embodiments, the depth range of the groove 311 of the positioning grating 310 is 1 to 1000 μm, and the depth range of the positioning post 321 is correspondingly set to 1 to 1000 μm.
[0051] It should be noted that the positioning grating 310 of this application is a micro-nano structure arranged periodically on the optical waveguide substrate 1. It has high processing and manufacturing precision, can achieve nanometer-level positioning accuracy, and has extremely high dimensional accuracy. The precision dimensions of the positioning post 321 match those of the positioning grating 310, which effectively improves the positioning and alignment accuracy between the optomechanical component 2 and the optical waveguide substrate 1, and precisely controls the entrance pupil distance and coupling angle of the optical path.
[0052] For example, the material of the optical waveguide substrate 1 is glass, silicon or gallium arsenide. The fabrication process of setting the positioning grating 310 on the optical waveguide substrate 1 can be nanoimprinting, selective deposition (CVD / ALD), photolithography and etching, laser direct writing, etc., as long as the structural and dimensional accuracy of the positioning grating 310 is met. The above-mentioned fabrication methods can adopt conventional fabrication methods in the prior art, which will not be described in detail here.
[0053] In some embodiments, the positioning grating 310 is made of a colloid that can be imprinted onto the optical waveguide substrate 1.
[0054] Preferably, the positioning grating 310 of this application is fabricated on the optical waveguide substrate 1 using a nanoimprinting process. The specific processing method is as follows: 1. Preparing an imprinting template; pre-configuring the imprinting template and etching a corresponding pattern on the imprinting template according to the structure of the positioning grating 310; 2. Treating the optical waveguide substrate and setting the imprinting colloid; cleaning the surface of the optical waveguide substrate 1, and plasma treatment of the surface of the optical waveguide substrate 1 can be performed to improve surface adhesion; coating the surface of the optical waveguide substrate 1 with the imprinting colloid to form a colloid layer of the required thickness; 3. Imprinting; aligning and pressing the imprinting template onto the colloid on the optical waveguide substrate 1, and curing the colloid by ultraviolet light irradiation and / or heating; 4. Demolding; removing the imprinting template from the optical waveguide substrate 1, thus forming the positioning grating 310 on the optical waveguide substrate 1; 5. Removing and cleaning; removing the residual colloid and cleaning the optical waveguide substrate 1. High-precision positioning gratings 310 can be efficiently fabricated on the optical waveguide substrate 1 using nanoimprint lithography, with a simple process and low manufacturing cost.
[0055] Specifically, the colloid can be made of epoxy resin, polyurethane, acrylic, or other adhesives, and has high structural strength.
[0056] refer to Figure 3 In some embodiments, the outer periphery of the coupling region 110 is circular, and the positioning grating 310 surrounds the coupling region 110 with the center of the circle as the center.
[0057] Specifically, the outer periphery of the coupling region 110 on the optical waveguide substrate 1 of this application is circular, the positioning grating 310 is annular, and the positioning grating 310 is concentrically arranged with the coupling region 110, so that the optical axis of the optical beam of the optomechanical component 2 is aligned with the center of the coupling region 110, thereby achieving precise optical path coupling. The concentric structure is beneficial to compensate for the error during alignment and positioning, and improves the stability and efficiency of optical waveguide coupling.
[0058] In some embodiments, the distance between the inner edge of the positioning grating 310 and the outer edge of the coupling region 110 ranges from 50 to 200 μm. Maintaining a reasonable distance between the inner edge of the positioning grating 310 and the outer edge of the coupling region 110 ensures high-precision alignment while reducing the space occupied by the positioning grating 310 on the optical waveguide substrate 1.
[0059] refer to Figure 2 and Figure 4 In some embodiments, the optomechanical assembly 2 includes a substrate 21 and a lens 210 disposed within the substrate 21, with a plurality of positioning posts 321 arranged periodically around the center of the lens 210.
[0060] Understandably, refer to Figure 2 The optomechanical assembly 2 also includes a display assembly 220 disposed within the substrate 21. The display assembly 220 is the core imaging element. The optical path of the optomechanical assembly 2 is: display assembly 220 - lens 210 - optical waveguide substrate 1. The center of the lens 210 coincides with the optical axis of the beam emitted by the optomechanical assembly 2. Correspondingly, the center of the positioning grating 310 coincides with the center of the coupling region 110. After the positioning grating 310 and the positioning post 321 on the lens 210 are aligned and positioned, the optical axis of the optomechanical assembly 2 is aligned with the center of the coupling region 110, so that the optical path alignment accuracy between the optomechanical assembly 2 and the optical waveguide substrate 1 is high, ensuring efficient optical coupling and good imaging effect, thereby enabling precise control of the entrance pupil distance and angle of the optomechanical assembly 2.
[0061] Specifically, the optical-mechanical component 2 can be configured to transmit data to and receive data from an external processing device via a signal connection, which can be a wired connection, a wireless connection, or a combination thereof. However, in other cases, the optical-mechanical component 2 can be used as a standalone device, i.e., data processing can be performed within the optical-mechanical component 2 itself. The signal connection can be configured to carry any kind of data, such as image data (e.g., still images and / or fully moving video, including 2D and 3D images), audio, multimedia, voice, and / or any other type of data. The external processing device can be, for example, a game console, a personal computer, a tablet computer, a smartphone, or other types of processing devices.
[0062] Signal connectivity can be, for example, a Universal Serial Bus (USB) connection, a Wi-Fi connection, a Bluetooth or Bluetooth Low Energy (BLE) connection, an Ethernet connection, a cable connection, a DSL connection, a cellular connection (e.g., 3G, LTE / 4G, or 5G), or a combination thereof. Additionally, the external processing device can communicate with one or more other external processing devices via a network, which can be, or include, for example, a Local Area Network (LAN), a Wide Area Network (WAN), an Intranet, a Metropolitan Area Network (MAN), the Internet, or a combination thereof.
[0063] In addition to the display component 220 and lens 210, the optomechanical assembly 2 may also house optics, sensors, and processors. The display component 220 is designed to function as virtual reality glasses, for example, by projecting light onto the user's eyes, or as augmented reality glasses, by projecting light onto the user's eyes to overlay an image onto the user's view of their real-world environment. The optomechanical assembly 2 may also include sensors such as ambient light sensors and Hall effect sensors, and may further include a control system to control at least some of the aforementioned components and perform associated data processing functions. The control system may include, for example, one or more processors and one or more memories.
[0064] In some embodiments, the positioning and mating structure 32 includes a matching grating structure disposed on the lens 210 using a nanoimprinting process, the matching grating structure corresponding to the positioning grating 310; the matching grating structure is formed with positioning posts 321.
[0065] Specifically, a matching grating structure is set on the lens 210 using a nanoimprinting process, which facilitates the preparation of periodically arranged and highly precise positioning posts 321. The process is simple and the manufacturing cost is low.
[0066] In some embodiments, lens 210 is a metalens.
[0067] It should be noted that a metalens, also known as a superlens, is a two-dimensional planar lens structure made of a metasurface (a planar two-dimensional (2D) metamaterial with subwavelength thickness) optical element that focuses light. Metalenses offer advantages such as thinner size, lighter weight, lower cost, better imaging, and easier integration. Furthermore, the lens 210 of this application differs from traditional concave or convex lenses; as a planar optical element, it is easier to perform nanoimprinting on its surface to create a positioning and mating structure 32.
[0068] In some embodiments, both the positioning structure 31 and the positioning mating structure 32 are light-transmitting.
[0069] Preferably, the positioning structure 31 includes a positioning grating 310 disposed on the optical waveguide substrate 1 using a nanoimprinting process, the positioning grating 310 being formed by imprinting with a light-transmitting imprinting adhesive; the positioning mating structure 32 is a mating grating structure disposed on the lens 210 using a nanoimprinting process, the mating grating structure being formed by imprinting with a light-transmitting imprinting adhesive; thus, both the positioning structure 31 on the optical waveguide substrate 1 and the positioning mating structure 32 on the lens 210 are light-transmitting and do not affect the propagation of the light beam.
[0070] refer to Figure 1 In some embodiments, the optical waveguide substrate 1 has a coupling region 110 and coupling out regions 120 located on both sides of the coupling region 110, and a positioning grating 310 is provided on the outer periphery of the coupling region 110; a positioning and mating structure 32 is correspondingly provided on the lens 210 of the optomechanical assembly 2.
[0071] That is, this application is a single-optical-mechanical dual-optical waveguide, which is configured with only one optical-mechanical component 2. Through beam splitting or replication optical design, the beam of the single-optical-mechanical component 2 is distributed to the left and right eye regions corresponding to the optical waveguide substrate 1.
[0072] refer to Figure 5 In some other embodiments, the optical waveguide substrate 1 has a plurality of coupling-in regions 110 and a plurality of coupling-out regions 120, and each coupling-in region 110 is provided with a positioning grating 310 on its outer periphery.
[0073] Understandably, the application can also be a dual-optical-mechanical dual-optical-waveguide, with independent optical-mechanical components 2 configured in the left and right eye regions of the optical waveguide substrate 1. The optical waveguide substrate 1 is provided with multiple coupling-in regions 110 and multiple coupling-out regions 120. Each coupling-in region 110 is provided with a positioning grating 310 on its outer periphery, and periodically arranged positioning posts 321 are provided at the corresponding positions of the corresponding optical-mechanical components 2. Then, positioning is achieved by positioning components 3 at multiple positions, so as to realize high-precision alignment and positioning between the optical-mechanical components 2 and the optical waveguide substrate 1.
[0074] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An AR device, characterized in that, include: Optical waveguide substrate; The optical waveguide substrate has a coupling-in region and a coupling-out region; Optomechanical components for propagating a light beam into the coupling region; The positioning component includes a positioning structure disposed on the optical waveguide substrate and a corresponding positioning mating structure disposed on the optomechanical component; the positioning structure is located around the coupling region, and the positioning mating structure is used to position and mate with the positioning structure to limit the position of the optomechanical component and the optical waveguide substrate.
2. The AR device according to claim 1, characterized in that, The positioning structure includes a ring of positioning gratings disposed on the outer periphery of the coupling area, the positioning gratings including periodically arranged grooves and protrusions; the positioning mating structure correspondingly includes a ring of periodically arranged positioning posts, the positioning posts being used to embed into the grooves.
3. The AR device according to claim 2, characterized in that, The width of the groove in the positioning grating ranges from 1 to 1000 μm, and the width of the positioning post is correspondingly set to 1 to 1000 μm; and / or, The depth range of the groove of the positioning grating is 1 to 1000 μm, and the depth range of the positioning post is correspondingly set to 1 to 1000 μm.
4. The AR device according to claim 2 or 3, characterized in that, The positioning grating is made of a colloid used for imprinting onto the optical waveguide substrate.
5. The AR device according to claim 2, characterized in that, The outer periphery of the coupling region is circular, and the positioning grating surrounds the coupling region with the center of the circle as the center.
6. The AR device according to claim 2, characterized in that, The optomechanical assembly includes a substrate and a lens disposed within the substrate, with a plurality of positioning posts arranged periodically around the center of the lens.
7. The AR device according to claim 6, characterized in that, The lens is a meta-lens.
8. The AR device according to claim 1, characterized in that, Both the positioning structure and the positioning mating structure are light-transmitting.
9. The AR device according to claim 2, characterized in that, The positioning post can be any one of a prism, cylinder, or cubic prism; the groove structure of the positioning grating is adapted to the positioning post.
10. The AR device according to claim 2, characterized in that, The optical waveguide substrate has multiple coupling-in regions and multiple coupling-out regions, and each coupling-in region is provided with a positioning grating on its outer periphery; there are multiple optomechanical components, and each optomechanical component is provided with a periodically arranged positioning post at a position corresponding to the optical waveguide substrate.