Optical module, packaging method of the same, and augmented reality glasses

Abstract

An optical module includes an optical waveguide component, a first transparent component, and a second transparent component. The optical waveguide component includes a substrate and a plurality of grating regions. The substrate includes a first surface and a second surface opposite to each other. The grating region includes a plurality optical microstructures protruding on the substrate. The first transparent component is set on a side of the substrate where the first surface is located. The second transparent component is set on a side of the substrate where the second surface is located. The optical module further includes a transparent first optical adhesive between at least one of the first surface and the first transparent component, and between the second surface and the second transparent component. The first optical adhesive is set in an optical path of stray light in the optical waveguide component. The first optical adhesive reduces or eliminates the conduction of stray light in the optical waveguide component. This application also provides a packaging method for the optical module and augmented reality glasses.

Description

[Technical Field]

[0001] This application relates to the field of optics, and more particularly to an optical module and its packaging method, as well as augmented reality glasses including the optical module. [Previous Technology]

[0002] Near-eye displays (NEDs) or head-mounted displays (HMDs) are fundamental devices for realizing virtual reality (VR) and augmented reality (AR) and providing immersive and interactive experiences. They seamlessly integrate the digital world with the physical world, allowing users to interact naturally with digital content, thus becoming a goal of industry development. Conventional AR glasses use grating waveguide display technology. Grating waveguide technology utilizes diffraction gratings to achieve the incident, deflection, and exit of light, and uses the principle of total internal reflection to transmit light, transmitting the image from the microdisplay to the human eye, thereby allowing the viewer to see virtual images. Grating waveguide technology has many advantages, such as good perspective, thinness, and low mass production cost, and is considered the development direction of AR near-eye display technology. Grating waveguides mostly use diffraction pupil expansion methods, allowing parallel light from various angles to enter the human eye and form an image. However, conventional grating waveguides, in order to improve the uniformity of light intensity incident on the human eye, usually need to reduce diffraction efficiency and increase pupil dilation efficiency. This will cause some light to become stray light after total internal reflection and enter the human eye. [Summary of the Invention]

[0003] In view of this, this application provides an optical module that effectively reduces or eliminates stray light transmission in optical waveguide elements.

[0004] An optical module includes: an optical waveguide element, including a substrate and a plurality of grating regions, the substrate including a first surface and a second surface opposite to each other, the plurality of grating regions being disposed at intervals on the first surface, each grating region including a plurality of optical microstructures protruding from the substrate and spaced apart from each other; a first light-transmitting element disposed on the side of the first surface of the substrate; a second light-transmitting element disposed on the side of the second surface of the substrate; and a transparent first optical adhesive disposed at least one between the first surface and the first light-transmitting element, and between the second surface and the second light-transmitting element, the first optical adhesive being disposed in the optical path of stray light in the optical waveguide element, and the projection of the first optical adhesive on the substrate and the projection of the plurality of grating regions on the substrate being spaced apart from each other.

[0005] The optical module of this application embodiment provides a first optical adhesive in the stray light path of the optical waveguide element. The first optical adhesive can not only effectively reduce or eliminate the transmission of stray light in the optical waveguide element, but also play a role in bonding the optical waveguide element and other optical elements, thereby increasing the packaging reliability.

[0006] In some embodiments, the refractive index of the first optical adhesive is substantially the same as the refractive index of the substrate.

[0007] In some embodiments, the optical module further includes a transparent second optical adhesive, which is bonded between the first surface and the first light-transmitting element, and between the second surface and the second light-transmitting element. The second optical adhesive surrounds a plurality of the grating regions and avoids the main optical path of light in the optical waveguide element. The first optical adhesive is surrounded by the second optical adhesive.

[0008] In some embodiments, the second optical adhesive includes a barrier surrounding the plurality of grating regions, the second optical adhesive extending to cover the area between the barrier and the edge of the substrate.

[0009] In some embodiments, the projected area of ​​the first optical adhesive on the substrate is smaller than the projected area of ​​the second optical adhesive on the substrate.

[0010] In some embodiments, the first optical adhesive and the second optical adhesive are disposed on the substrate in areas other than the grating region and the main optical path.

[0011] In some embodiments, the second optical adhesive is disposed between the first surface and the first light-transmitting element, and between the second surface and the second light-transmitting element, and the second optical adhesive disposed between the first surface and the first light-transmitting element at least partially overlaps with the second optical adhesive between the second surface and the second light-transmitting element.

[0012] In some embodiments, the thickness of the first optical adhesive does not exceed 0.5 mm.

[0013] In some embodiments, at least one of the first light-transmitting element and the second light-transmitting element is a lens with refractive power, or at least one of the first light-transmitting element and the second light-transmitting element is a light-transmitting flat glass or flat plastic.

[0014] In some embodiments, the first light-transmitting element, the optical waveguide element, and the periphery of the first light-transmitting element, which are stacked in sequence, are connected with a light-shielding adhesive.

[0015] This application also provides augmented reality glasses, including a projection system and the optical module described above.

[0016] This application also provides a packaging method for an optical module, comprising: providing an optical waveguide element, the optical waveguide element including a substrate and a plurality of grating regions, the substrate including a first surface and a second surface opposite to each other, the plurality of grating regions being disposed at intervals on the first surface; disposing a solid barrier on the first surface and the second surface, the barrier being a transparent optical adhesive, the barrier surrounding the plurality of grating regions and being spaced apart from each of the grating regions; disposing a transparent first optical adhesive on the first surface or the second surface, the first optical adhesive being disposed in a stray light path; stacking a first light-transmitting element on the side of the optical waveguide element where the first surface is located, and stacking a second light-transmitting element on the side of the optical waveguide element where the second surface is located; injecting a transparent liquid optical adhesive between the first light-transmitting element and the first surface, injecting a transparent liquid optical adhesive between the second light-transmitting element and the second surface, and curing the liquid optical adhesive.

Implementation Method

[0017] The optical module of this application optimizes the optical waveguide element by setting a transparent second optical adhesive at a specific position on the substrate of the optical waveguide element. The second optical adhesive can not only bond the optical waveguide element and other optical elements, but also destroy the total internal reflection path of stray light in the optical waveguide element, thereby effectively reducing or eliminating the transmission of stray light in the optical waveguide element.

[0018] As shown in FIG1, the optical module 100 of this application embodiment includes an optical waveguide element 10 and a first light-transmitting element 20 and a second light-transmitting element 30 disposed on opposite sides of the optical waveguide element 10. The optical waveguide element 10 is sandwiched between the first light-transmitting element 20 and the second light-transmitting element 30.

[0019] The optical waveguide element 10 of this application embodiment is a grating waveguide. As shown in Figures 1 and 2, the optical waveguide element 10 includes a substrate 11 and a grating disposed on the substrate 11. The grating is disposed in a plurality of grating regions 13 spaced apart from each other. The substrate 11 includes a first surface 111 and a second surface 113 facing each other, and the plurality of grating regions 13 are disposed at intervals on the first surface 111. Each grating region 13 includes a plurality of optical microstructures (not shown) protruding from the first surface 111 and spaced apart from each other. Each optical microstructure is columnar and has a size on the nanometer scale. In some embodiments, the height of the optical microstructure is 80nm-200nm, for example, 80nm-120nm. The substrate 11 can transmit the optomechanical image by total internal reflection and output light to the human eye through a grating. It is understood that, depending on the function of each grating region 13, the outline shape of each grating region 13, as well as the cross-sectional shape, arrangement, and size of the optical microstructures in each grating region 13, may be different.

[0020] As shown in Figure 1, the first light-transmitting element 20 is disposed on the side where the first surface 111 of the substrate 11 is located, and the second light-transmitting element 30 is disposed on the side where the second surface 113 of the substrate 11 is located.

[0021] The optical module 100 also includes a transparent first optical adhesive 40. The first optical adhesive 40 is disposed between at least one of the first surface 111 and the first light-transmitting element 20, and between the second surface 113 and the second light-transmitting element 30. That is, the first optical adhesive 40 may be disposed on the first surface 111, or the second surface 113, or both the first surface 111 and the second surface 113. Typically, the first optical adhesive 40 is disposed on the first surface 111 or the second surface 113. The first optical adhesive 40 is disposed in a specific area, so that it neither covers the grating area 13 nor the main propagation path (main optical path 70) of the main ray in the optical waveguide element 10, so as to avoid affecting the transmission of the main ray in the optical waveguide element 10. In this embodiment, the first optical adhesive 40 is disposed in the propagation path (stray light path) of stray light in the optical waveguide element 10.

[0022] Furthermore, the projection of the first optical adhesive 40 onto the substrate 11 and the projections of the plurality of grating regions 13 onto the substrate 11 are spaced apart. When the first optical adhesive 40 is disposed on the first surface 111, the first optical adhesive 40 and the grating regions 13 on the first surface 111 are spaced apart. When the second optical adhesive 50 is disposed on the second surface 113, the projection of the first optical adhesive 40 onto the substrate 11 and the projections of the grating regions 13 on the first surface 111 onto the substrate 11 are spaced apart.

[0023] The first optical adhesive 40 is disposed in the blank area between adjacent grating regions 13, and the position of the first optical adhesive 40 needs to be determined according to the position of the stray light optical path. In this embodiment of the application, one first optical adhesive 40 is provided, but it is not limited thereto. The number of first optical adhesives 40 provided can be one, two or more, and the number can be adjusted and designed according to the layout of the stray light optical path. It is understood that the stray light optical path can be determined by pre-placing the optical waveguide element 10 in optical software for analog testing.

[0024] In some embodiments, the refractive index of the first optical adhesive 40 is substantially the same as that of the substrate 11. Thus, when stray light passes through the interface between the substrate 11 and the first optical adhesive 40, the reflection and refraction of the stray light at the interface can be greatly reduced, allowing the stray light to exit smoothly from the first optical adhesive 40. In this application, "substantially the same refractive index of the first optical adhesive 40 as the substrate 11" means that the refractive index of the first optical adhesive 40 is 97%-103% of the refractive index of the substrate 11. For example, the refractive index of the first optical adhesive 40 is equal to that of the substrate 11. The projection shape of the first optical adhesive 40 on the substrate 11 is not limited to any particular shape; for example, it can be circular, rectangular, elliptical, or other irregular shapes.

[0025] As shown in Figures 1 and 2, the optical module also includes a transparent second optical adhesive 50, which is located between the first light-transmitting element 20 and the optical waveguide element 10, and between the second light-transmitting element 30 and the optical waveguide element 10. Through the second optical adhesive 50, the first light-transmitting element 20 and the optical waveguide element 10 can be bonded together, and the second light-transmitting element 30 and the optical waveguide element 10 can be bonded together.

[0026] As shown in Figure 2, the multiple grating regions 13 do not occupy the entire area of ​​the first surface 111. The second optical adhesive 50 is also disposed in a specific area, neither covering the grating regions 13 nor the main propagation path (main optical path 70) of the main light ray in the optical waveguide element 10, so as to avoid affecting the propagation of the main light ray in the optical waveguide element 10. In this embodiment, the second optical adhesive 50 surrounds the multiple grating regions 13 and extends towards the edge region of the substrate 11, and the second optical adhesive 50 is spaced apart from each grating region 13. In this embodiment, the periphery of the multiple grating regions 13 is defined by a peripheral contour line, and the second optical adhesive 50 is disposed in the region between the peripheral contour line and each edge of the substrate 11. Light is projected onto the optical waveguide element 10 and propagated between the multiple grating regions 13, forming the main optical path 70 of the light ray in the optical waveguide element 10. The second optical adhesive 50 also avoids the main optical path 70, that is, it does not coincide with the main optical path 70, so as to avoid affecting the propagation of the main light ray.

[0027] The second optical adhesive 50 includes a barrier 51 surrounding a plurality of grating regions 13, extending from the barrier 51 to the edge of the substrate 11. The barrier 51 effectively defines the profile of the second optical adhesive 50 on the side where the grating regions 13 are located. In this way, the area of ​​the second optical adhesive 50 can be maximized, increasing the bonding area between the optical waveguide element 10 and the first light-transmitting element 20 and the second light-transmitting element 30, and improving the reliability of the bonding.

[0028] By combining the first optical adhesive 40 and the second optical adhesive 50, the propagation of stray light in the optical waveguide element 10 can be further reduced or eliminated.

[0029] In this embodiment of the application, the retaining wall 51 includes a plurality of straight segments connected in sequence. It can be understood that the retaining wall 51 may also include a plurality of curved segments connected in sequence, or at least one straight segment and at least one curved segment connected in sequence.

[0030] In this embodiment of the application, the second optical adhesive 50 includes two spaced-apart baffles 51, with a plurality of grating regions 13 located between the two baffles 51. Correspondingly, the second optical adhesive 50 includes two spaced-apart sub-parts, with a plurality of grating regions 13 located between the two sub-parts. It is understood that the arrangement of the baffles 51 is not limited to the shape shown in FIG1, but can also be various other shapes, in short, it must be compatible with the shape and arrangement of the plurality of grating regions 13 on the substrate 11.

[0031] In some embodiments, depending on the fabrication method of the optical waveguide element 10, the substrate 11 and the grating may be made of the same material or different materials.

[0032] In this embodiment of the application, as shown in FIG2, the plurality of grating regions 13 include light-injection regions 131, light-turning regions 132, and light-outjection regions 133 located on the same surface and spaced apart from each other. Light rays sequentially enter from the light-injection regions 131, then enter the light-turning regions 132, and then enter the light-outjection regions 133.

[0033] The working principle of the optical waveguide element 10 is as follows: Light carrying image information is projected onto the light coupling region 131. The grating of the light coupling region 131 diffracts to generate diffracted light. When the diffracted light satisfies the total internal reflection condition of the optical substrate 11, that is, when the angle of incidence on the optical surface is greater than the critical angle of total internal reflection of the substrate 11, the light beam undergoes total internal reflection and is transmitted in the substrate 11 with almost no loss. The diffracted light beam is transmitted towards the light turning region 132. When it is incident on the light turning region 132, it is diffracted by the grating of the light turning region 132 and continues to be transmitted along the grating of the light turning region 132. At the same time, a series of diffracted light is generated and transmitted towards the light coupling region 133. This part of the light is transmitted to the light coupling region 133. After being diffracted by the grating of the light coupling region 133, it no longer satisfies the total internal reflection condition of the optical substrate 11 and exits the substrate 11, enters the human eye and is perceived.

[0034] In this embodiment, the light-in coupling region 131 is generally circular, the light-turning region 132 is trapezoidal, and the light-out coupling region 133 is rectangular, but not limited thereto. The light-out coupling region 133 is located on one side of the light-in coupling region 131 and the light-turning region 132. Based on the shape, size, and relative arrangement of the light-in coupling region 131, the light-turning region 132, and the light-out coupling region 133, the approximate position and direction of the main optical path 70 can be determined, as shown in Figure 2. The main optical path 70 can also be determined by pre-placing the optical waveguide element 10 in optical software for analog testing.

[0035] In some embodiments, the thickness of the first optical adhesive 40 and the second optical adhesive 50 does not exceed 0.5 mm, for example, 0.1 mm.

[0036] In other embodiments, the first optical adhesive 40 and the second optical adhesive 50 may be disposed on the first surface 111 in areas other than the grating region 13 and the main optical path 70.

[0037] Normally, the area covered by the second optical adhesive 50 on the substrate 11 is larger, while the area covered by the first optical adhesive 40 on the substrate 11 is smaller, that is, the projected area of ​​the first optical adhesive 40 on the substrate 11 is smaller than the projected area of ​​the second optical adhesive 50 on the substrate 11.

[0038] By combining the first optical adhesive 40 and the second optical adhesive 50, the total internal reflection path of stray light can be destroyed, and stray light rays are introduced from the optical waveguide element 10 into the second optical adhesive 50 / first optical adhesive 40, thereby reducing or eliminating stray light energy.

[0039] It is understandable that the first optical adhesive 40 and the second optical adhesive 50 can be solid encapsulants or liquid encapsulants, which are formed by curing the liquid encapsulants.

[0040] In some embodiments, at least one of the first light-transmitting element 20 and the second light-transmitting element 30 is a lens with refractive power. As shown in FIG1, in an embodiment of this application, the first light-transmitting element 20 is a convex lens with one side being convex and the other side being flat, wherein the convex side faces away from the optical waveguide element 10, and the second light-transmitting element 30 is a concave lens with one side being concave and the other side being flat, wherein the concave side faces away from the optical waveguide element 10.

[0041] In some other embodiments, at least one of the first light-transmitting element 20 and the second light-transmitting element 30 is a light-transmitting flat glass or flat plastic.

[0042] In this embodiment, the second optical adhesive 50 is disposed between the first surface 111 and the first light-transmitting element 20, and between the second surface 113 and the second light-transmitting element 30. The second optical adhesive 50 disposed between the first surface 111 and the first light-transmitting element 20 and the second optical adhesive 50 disposed between the second surface 113 and the second light-transmitting element 30 at least partially overlap. In some embodiments, the second optical adhesive 50 disposed between the first surface 111 and the first light-transmitting element 20 and the second optical adhesive 50 disposed between the second surface 113 and the second light-transmitting element 30 completely overlap.

[0043] As shown in Figure 1, a light-shielding adhesive 60 is provided at the edge of the optical module. For example, the light-shielding adhesive 60 can be a black adhesive. The light-shielding adhesive 60 is attached to the periphery of the first light-transmitting element 20, the substrate 11, and the second light-transmitting element 30, which are stacked in sequence.

[0044] This application embodiment also provides a packaging method for the above-mentioned optical module, including the following steps S1 to S6. It is understood that the order of the steps in the preparation method is not limited to this, for example, S2 and S3 can be adjusted.

[0045] S1: Provide optical waveguide element 10.

[0046] The optical waveguide element 10 includes a substrate 11 and a plurality of grating regions 13. The substrate 11 includes a first surface 111 and a second surface 113 opposite to each other, and the plurality of grating regions 13 are disposed at intervals on the first surface 111.

[0047] S2: Solid barrier 51 is provided on the first surface 111 and the second surface 113 of the substrate 11, respectively. The barrier 51 is a transparent optical adhesive.

[0048] The barrier 51 of the first surface 111 surrounds the plurality of grating regions 13 and is spaced apart from each grating region 13. The projection of the barrier 51 of the second surface 113 onto the substrate 11 surrounds the projection of the plurality of grating regions 13 onto the substrate 11 and is spaced apart from the projection of each grating region 13 onto the substrate 11. The barrier 51 includes sequentially connected straight segments, or sequentially connected curved segments, or sequentially connected straight segments and curved segments. The solid barrier 51 may also be formed by curing a liquid optical adhesive or by directly using a solid optical adhesive.

[0049] S3: A transparent first optical adhesive 40 is provided at a specific position (on the stray light path) of the first surface 111 or the second surface 113.

[0050] The first optical adhesive 40 can be a solid encapsulating adhesive or a liquid encapsulating adhesive that is then cured.

[0051] S4: Next, the first light-transmitting element 20 is stacked on the side where the first surface 111 is located, and the second light-transmitting element 30 is stacked on the side where the second surface 113 is located.

[0052] S5: Then, liquid and transparent optical adhesive is injected between the first light-transmitting element 20 and the first surface 111, and liquid and transparent optical adhesive is injected between the second light-transmitting element 30 and the second surface 113, and the liquid optical adhesive is cured.

[0053] Due to the setting of the barrier 51, the liquid optical adhesive will fill the area between the barrier 51 and the edge of the substrate 11 without entering the area surrounded by the barrier 51. After the liquid optical adhesive is cured, it will form the above-mentioned transparent second optical adhesive 50. In this way, the first light-transmitting element 20 is fixedly combined with the optical waveguide element 10, and the second light-transmitting element 30 is fixedly combined with the optical waveguide element 10.

[0054] S6: A light-shielding adhesive is provided around the first light-transmitting element 20, the optical waveguide element 10, and the second light-transmitting element 30.

[0055] Please refer to Figure 3. This application also provides a visual diagram of a comparative optical module and an optical module according to an embodiment of this application. In the comparative optical module, a transparent second optical adhesive 50 is not provided at a specific position on the substrate 11 of the optical waveguide element 10. As can be seen from Figure 3(a), in the comparative optical module, it is obvious that a ghosting caused by stray light can be seen in the upper left corner of the preset projection pattern. As can be seen from Figure 3(b), in the optical module according to the embodiment of this application, no ghosting is visible, and only the preset projection pattern is visible.

[0056] This application embodiment also provides augmented reality glasses, which can overlay virtual images onto real-world scenes, allowing users to see a blend of virtual and real worlds. As shown in FIG4, the augmented reality glasses 200 includes the aforementioned optical module 100 and projection system 210. The projection system 210 is located on one side of the optical module 100 and is used to generate a projection beam carrying image information and project it into the optical module 100.

[0057] The projection system can be an LCOS micro-projection system, a DLP micro-projection system, an OLED micro-projection system, a Micro LED micro-projection system, an LBS laser scanning micro-projection system, etc. LCOS and DLP micro-projection systems typically include a microdisplay LCOS or DMD, a backlight LED or laser, and an optical lens assembly; OLED and Micro LED micro-projection systems typically include a microdisplay OLED or Micro LED and an optical lens assembly; LBS laser scanning micro-projection systems typically include a laser light source, a collimation system, and a scanning device MEMS or scanning fiber. The light beam generated by the projection system 210 is transmitted, expanded, and emitted by the optical module 100, and then enters the human eye and is perceived.

[0058] In this embodiment of the application, the projection system 210 is located on the side of the optical waveguide element 10 where the second light-transmitting element 30 is disposed. In this way, the light from the projection system passes through the second light-transmitting element 30, is conducted by the optical waveguide element 10, and then passes through the first light-transmitting element 20 before being projected into the human eye.

[0059] The optical module of this application embodiment provides a first optical adhesive 40 on the stray light path of the optical waveguide element 10. The first optical adhesive 40 can not only effectively reduce or eliminate the transmission of stray light in the optical waveguide element 10, but also play a role in bonding the optical waveguide element 10 and other optical elements, thereby increasing the packaging reliability.

[0060] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application. [Simplified Explanation of the Diagram]

[0061] Figure 1 is a schematic diagram of an optical module according to an embodiment of this application.

[0062] Figure 2 is a top view of an optical module according to an embodiment of this application.

[0063] Figure 3 is a visual representation of a comparative optical module and an optical module according to an embodiment of this application.

[0064] Figure 4 is a schematic diagram of an augmented reality glasses module according to an embodiment of this application.

Claims

1. An optical module, improved in that: the optical module comprises: An optical waveguide element includes a substrate and a plurality of grating regions. The substrate includes a first surface and a second surface opposite to each other. The plurality of grating regions are disposed on the first surface at intervals. Each grating region includes a plurality of optical microstructures protruding from the substrate and spaced apart from each other. A first light-transmitting element is disposed on the side where the first surface of the substrate is located; A second light-transmitting element is disposed on the side where the second surface of the substrate is located; a transparent first optical adhesive is disposed between the first surface and the first light-transmitting element, and between the second surface and the second light-transmitting element, wherein the first optical adhesive is disposed in the optical path of stray light in the optical waveguide element, and the projection of the first optical adhesive on the substrate and the projection of the plurality of grating regions on the substrate are spaced apart from each other.

2. The optical module according to claim 1, wherein, The refractive index of the first optical adhesive is substantially the same as that of the substrate.

3. The optical module according to claim 1, wherein, The optical module further includes a transparent second optical adhesive, which is bonded between the first surface and the first light-transmitting element, and between the second surface and the second light-transmitting element. The second optical adhesive surrounds the plurality of grating regions and avoids the main optical path of light in the optical waveguide element. The first optical adhesive is surrounded by the second optical adhesive.

4. The optical module according to claim 3, wherein, The second optical adhesive includes a barrier surrounding the plurality of grating regions, and the second optical adhesive extends to cover the area between the barrier and the edge of the substrate.

5. The optical module according to claim 3, wherein, The projected area of ​​the first optical adhesive on the substrate is smaller than the projected area of ​​the second optical adhesive on the substrate.

6. The optical module according to claim 3, wherein, The first optical adhesive and the second optical adhesive are disposed on the substrate in areas other than the grating region and the main optical path.

7. The optical module according to claim 3, wherein, The second optical adhesive is disposed between the first surface and the first light-transmitting element, and between the second surface and the second light-transmitting element. The second optical adhesive disposed between the first surface and the first light-transmitting element at least partially overlaps with the second optical adhesive disposed between the second surface and the second light-transmitting element.

8. The optical module according to claim 1, wherein, The thickness of the first optical adhesive does not exceed 0.5 mm.

9. The optical module according to claim 1, wherein, At least one of the first light-transmitting element and the second light-transmitting element is a lens with refractive power, or at least one of the first light-transmitting element and the second light-transmitting element is a light-transmitting flat glass or flat plastic.

10. The optical module according to claim 1, wherein, The periphery of the first light-transmitting element, the optical waveguide element, and the second light-transmitting element, which are stacked in sequence, is connected with a light-shielding adhesive.

11. An augmented reality glasses, improved in that it comprises a projection system and an optical module as described in any one of claims 1 to 10; wherein, The projection system generates a projection beam carrying image information and projects it into the optical module.

12. An improvement to the packaging method of an optical module, comprising: An optical waveguide element is provided, the optical waveguide element comprising a substrate and a plurality of grating regions, the substrate comprising opposing first and second surfaces, the plurality of grating regions being disposed at intervals on the first surface; a solid barrier, which is a transparent optical adhesive, is disposed on the first and second surfaces, the barrier surrounding the plurality of grating regions and spaced apart from each of the grating regions; a transparent first optical adhesive is disposed on the first or second surface, the first optical adhesive being disposed in a stray light optical path; A first light-transmitting element is stacked on the side where the first surface of the optical waveguide element is located, and a second light-transmitting element is stacked on the side where the second surface of the optical waveguide element is located. A transparent liquid optical adhesive is injected between the first light-transmitting element and the first surface, and a transparent liquid optical adhesive is injected between the second light-transmitting element and the second surface, and the liquid optical adhesive is cured.

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