Lens module and near-eye display device
By setting an anti-glare layer on the near-eye side surface of the AR glasses lens module, the problems of lens reflection spots and image interference are solved, resulting in clearer image display and a better user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SEEV OPTOELECTRONICS TECHNOLOGY CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-06-05
AI Technical Summary
In AR glasses, the light reflected from the near-eye surface of the lens forms reflected light spots and interferes with the image, affecting the clarity of the image coupled out by the coupled grating and resulting in a poor user experience.
An anti-glare layer is set on the near-eye side surface of the lens module, located between the input grating and the output grating. The tiny uneven structure of the anti-glare layer scatters the incident light and reduces the formation of reflected light.
It effectively eliminates reflected light spots and image interference on the near-eye surface of the lens, improves the clarity of the coupled grating image for users, and enhances the user experience of AR glasses.
Smart Images
Figure CN224328286U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of eyeglasses technology, and in particular to a lens module and a near-eye display device. Background Technology
[0002] In near-eye display devices such as AR glasses, the optical module includes an optical waveguide. An optical signal is introduced into the optical waveguide through a coupling grating. The optical signal propagates in the optical waveguide and is coupled out from the coupling grating to the human eye, so that the human eye can see information such as images, videos, and text.
[0003] like Figure 1 As shown, when a user wears AR glasses in a complex lighting environment, light L1 from behind the lens will be incident on the surface of the lens near the eye (the side of the lens closest to the human eye when wearing AR glasses). After being reflected by the surface of the lens near the eye, light L1 will form reflected light L2 which will be incident on the human eye, forming reflected light spots and interfering images, affecting the user's vision through the lens. For example, it will affect the image formed by the light emitted from the coupling grating in the lens, reducing the user's experience of using AR glasses. Utility Model Content
[0004] The purpose of this utility model embodiment is to provide a lens module and a near-eye display device to solve the problem that the reflection of light from the near-eye side surface of the lens in AR glasses forms reflected light spots and interferes with the image, affecting the user's viewing of the image coupled out by the coupled grating, resulting in a poor user experience when using AR glasses.
[0005] To solve the above problems, the present invention adopts the following technical solution:
[0006] In a first aspect, a lens module is provided, the lens module having a near-eye side and a far-eye side opposite to each other and including an insertion grating and an exit grating disposed at a distance from each other, wherein an anti-glare layer is disposed on at least a portion of the surface of the near-eye side of the lens module between the insertion grating and the exit grating.
[0007] Optionally, the lens module includes an optical waveguide layer and a protective layer. The coupling grating and the coupling output grating are disposed on the optical waveguide layer at a distance. The protective layer is bonded to the surface of the optical waveguide layer where the coupling grating and the coupling output grating are disposed through a first transparent filler adhesive layer.
[0008] Optionally, the coupling grating and the coupling output grating are disposed at a distance on the far-eye side surface of the optical waveguide layer, and the protective layer is bonded to the far-eye side surface of the optical waveguide layer through a first transparent filler adhesive layer.
[0009] Optionally, the coupling grating and the coupling output grating are disposed on the near-eye side surface of the optical waveguide layer at a distance from each other, the protective layer is bonded to the near-eye side surface of the optical waveguide layer through a first transparent filler adhesive layer, and the anti-glare layer is disposed on the near-eye side surface of the protective layer.
[0010] Optionally, it may also include a refractive layer, which is bonded to the distal surface of the protective layer via a second transparent filler layer.
[0011] Optionally, it also includes a refractive layer, which is connected to the near-eye surface of the optical waveguide layer via a connecting layer, and the anti-glare layer is disposed on the near-eye surface of the refractive layer and located between the coupling grating and the coupling grating.
[0012] Optionally, it may also include a refractive layer, which is bonded to the distal surface of the optical waveguide layer via a second transparent filler layer.
[0013] Optionally, it also includes a refractive layer, which is connected to the near-eye surface of the protective layer via a connecting layer, and the anti-glare layer is disposed on the near-eye surface of the refractive layer and located between the coupling grating and the coupling grating.
[0014] Secondly, a near-eye display device is provided, comprising:
[0015] The lens module described in any one of the first aspects;
[0016] A frame module, wherein the lens module is mounted on the frame module;
[0017] An optical engine module is connected to the lens frame module and is used to couple optical signals into the coupling grating of the lens module.
[0018] Optionally, the near-eye display device is AR glasses.
[0019] This utility model has the following beneficial effects:
[0020] The lens module of this invention has a near-eye side and a far-eye side, and includes an input grating and an output grating arranged at a distance. An anti-glare layer is provided on at least a portion of the surface of the near-eye side of the lens module between the input grating and the output grating. After the lens module is installed in the frame of a near-eye display device, the anti-glare layer can scatter the light incident on the near-eye side surface, thereby reducing the reflected light from the near-eye side surface that is reflected back to the eye. This eliminates the reflected light spots and interfering images formed on the near-eye side surface of the lens, improves the clarity of the image coupled out by the output grating, and enhances the user's experience of using AR glasses. Attached Figure Description
[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0022] Figure 1 This is a schematic diagram of the reflection of light from behind by a lens in a related technology;
[0023] Figure 2 This is a schematic diagram of the overall structure of a lens module provided in an embodiment of the present utility model;
[0024] Figure 3 A diagram illustrating the light scattering effect of the anti-glare layer;
[0025] Figure 4 A schematic diagram of the layer structure of a lens module provided in an embodiment of this utility model;
[0026] Figure 5 A schematic diagram of the layer structure of another lens module provided in this embodiment of the present invention;
[0027] Figure 6 This is a schematic diagram of the layer structure of another lens module provided in an embodiment of the present utility model;
[0028] Figure 7 A schematic diagram of the layer structure of another lens module provided in this embodiment of the present invention;
[0029] Figure 8 This is a schematic diagram of the layer structure of another lens module provided in an embodiment of the present utility model;
[0030] In the attached image:
[0031] 1. Coupled-in grating; 2. Coupled-out grating; 3. Anti-glare layer; 4. Human eye; 5. Optical waveguide layer; 6. Protective layer; 7. First transparent filler layer; 8. Refractive layer; 9. Second transparent filler layer; 10. Connecting layer. Detailed Implementation
[0032] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 utility model based on the specific circumstances.
[0034] Figure 2 This is a schematic diagram of the overall structure of a lens module according to an embodiment of the present invention. The lens module can be used in near-eye display devices such as AR glasses. The lens module can be a module comprising one or more layers, such as... Figure 2 As shown, the lens module has a far eye side F1 and a near eye side F2, and the lens module includes an input grating 1 and an output grating 2 arranged at a distance from each other. An anti-glare layer 3 is provided on at least a portion of the surface of the near eye side F2 of the lens module between the input grating 1 and the output grating 2.
[0035] The lens module and frame are assembled into glasses that are worn on the user's head. The side of the lens module furthest from the eye (4) is the far-eye side (F1), and the side of the lens module closest to the eye (4) is the near-eye side (F2). Figure 2 It can be seen that the far eye side F1 and the near eye side F2 are the two opposite sides of the lens module.
[0036] A grating is an optical structure primarily used in augmented reality (AR) when placed on an optical waveguide. By fabricating the grating structure onto a waveguide substrate, the diffraction effect of the grating structure is used to deflect the light beam, and the waveguide principle within the waveguide substrate is used to conduct and extend the beam, thus presenting virtual information such as images and videos to the viewer. Specifically, in this embodiment, as... Figure 2 As shown, the grating includes an input grating 1 and an output grating 2 disposed at a distance in the lens module. The input grating 1 is used to couple in an optical signal, which is transmitted in the lens module and then coupled out from the output grating 2 to the human eye 4 to present virtual information such as images and videos.
[0037] like Figure 2 As shown, an anti-glare layer 3 is provided on at least a portion of the surface of the lens module on the near-eye side F2, between the coupling grating 1 and the coupling grating 2. The size of the anti-glare layer 3 can be determined based on the user's pupil position, facial contours, and other biometric features, as well as the vertical distance from the lens module to the pupil after the glasses are worn. Figure 2 Figure a shows the front view of the lens module, and Figure b shows the top view. Figure 2The middle lens module is the right eyeglass lens module. The coupling grating 1 is located at the right boundary of the lens module, and the coupling grating 2 is located approximately in the middle of the lens module so that the coupling grating 2 can face the human eye 4 when the glasses are worn. The anti-glare layer 3 is disposed on the surface of the near-eye side F2 of the lens module and is located between the coupling grating 1 and the coupling grating 2.
[0038] like Figure 3 As shown, since the anti-glare layer 3 is a structural layer with a tiny uneven structure on its surface, after light L1 shines on the anti-glare layer 3, it is scattered into light L2 in multiple directions by the uneven structure on the surface of the anti-glare layer 3. The light L1 is no longer reflected into the human eye in the regular way of reflection of a smooth mirror surface. This reduces or even eliminates the reflected light L1 that is incident on the near-eye side F2 surface of the lens module and is reflected into the human eye 4. This eliminates the reflected light spots and interference images formed by the reflected light L1 on the near-eye side surface F2 of the lens module, improves the clarity of the image coupled out by the coupling grating 2, and enhances the user's experience of using AR glasses.
[0039] Figure 4 A schematic diagram of the layer structure of a lens module provided in an embodiment of this utility model is shown below. Figure 4 As shown, the lens module includes an optical waveguide layer 5 and a protective layer 6. The coupling grating 1 and the coupling grating 2 are disposed on the optical waveguide layer 5 at a distance. The protective layer 6 is bonded to the surface of the optical waveguide layer 5 on the side where the coupling grating 1 and the coupling grating 2 are disposed through a first transparent filler layer 7, so as to protect the coupling grating 1 and the coupling grating 2 through the protective layer 6. The optical waveguide layer 5 serves as a waveguide substrate. The coupling grating 1 and the coupling grating 2 can be disposed on the surface of the optical waveguide layer 5 at a distance, so that after the light signal is coupled from the coupling grating 1 into the optical waveguide layer 5, it is transmitted to the coupling grating 2 through total internal reflection in the optical waveguide layer 5, and finally coupled out from the coupling grating 2 to the human eye 4. In addition, the protective layer 6 can be a transparent material structural layer, so that the protective layer 6 can protect the coupling grating 1 and the coupling grating 2 from physical impact and contaminants such as dust, without affecting the user's viewing of the real environment.
[0040] In one optional embodiment, the coupling grating 1 and the coupling grating 2 can be an integral structure with the optical waveguide layer 5. For example, the gratings can be formed on the optical waveguide layer 5 by electron beam lithography and etching. In another embodiment, the coupling grating 1 and the coupling grating 2 can also be separate structures with the optical waveguide layer 5. For example, after fabricating the coupling grating 1 and the coupling grating 2, the coupling grating 1 and the coupling grating 2 can be bonded to the optical waveguide layer 5 with transparent optical adhesive, or a layer of adhesive can be formed on the waveguide substrate, and then the coupling grating 1 and the coupling grating 2 can be formed on the optical waveguide layer 5 by nanoimprinting. This embodiment does not limit the specific structure of the coupling grating 1 and the coupling grating 2, or the connection method between the coupling grating 1 and the coupling grating 2 and the optical waveguide layer 5.
[0041] like Figure 4 As shown in Figure a, the insertion grating 1 and the output grating 2 are disposed at a distance on the surface of the optical waveguide layer 5 on the far-eye side F1. The protective layer 6 is bonded to the surface of the optical waveguide layer 5 on the far-eye side F1 through the first transparent filler adhesive layer 7, so as to protect the insertion grating 1 and the output grating 2 through the protective layer 6. In this lens module, the surface of the optical waveguide layer 5 on the near-eye side F2 is the same as the surface of the lens module on the near-eye side F2. That is, the anti-glare layer 3 is disposed on the surface of the optical waveguide layer 5 on the near-eye side F2 and is located between the insertion grating 1 and the output grating 2. By placing the insertion grating 1 and the output grating 2 on the far-eye side F1 of the optical waveguide layer 5, after this lens module is applied to a near-eye display device, the light insertion angle of the optical engine module is easier to control, which can improve the diffraction efficiency of the light.
[0042] like Figure 4 As shown in Figure b, the input grating 1 and the output grating 2 are disposed on the surface of the near-eye side F2 of the optical waveguide layer 5 at a distance. The protective layer 6 is bonded to the surface of the near-eye side F2 of the optical waveguide layer 5 through the first transparent filler adhesive layer 7, so as to protect the input grating 1 and the output grating 2 through the protective layer 6. In this lens module, the surface of the near-eye side F2 of the protective layer 6 is the surface of the near-eye side F2 of the lens module. That is, the anti-glare layer 3 is disposed on the surface of the protective layer 6 on the near-eye side F2 and is located between the input grating 1 and the output grating 2.
[0043] In this embodiment, the input grating 1 and the output grating 2 can be located on the same surface of the optical waveguide layer 5, such as... Figure 4 The coupling grating 1 and the coupling grating 2 are disposed on the surface of the optical waveguide layer 5 on the near-eye side F2 or the far-eye side F1. Of course, the coupling grating 1 and the coupling grating 2 can also be disposed on different surfaces of the optical waveguide layer 5. For example, the coupling grating 1 is disposed on the surface of the optical waveguide layer 5 on the near-eye side F2, and the coupling grating 2 is disposed on the surface of the optical waveguide layer 5 on the far-eye side F1. Those skilled in the art can set the coupling grating 1 and the coupling grating 2 according to actual needs.
[0044] In an optional embodiment, the lens module may further include a refractive layer for vision correction. For example, the refractive layer may be a concave lens or a convex lens, wherein the concave lens is used to correct hyperopia and the convex lens is used to correct myopia. By setting the refractive layer, the vision correction needs of myopia and hyperopia can be met. After the lens module is used in AR glasses, people with myopia and hyperopia do not need to wear additional myopia or hyperopia correction glasses when wearing AR glasses, making it more convenient for people with myopia and hyperopia to use AR glasses.
[0045] The following combination Figures 5-8 The layer structure of the lens module in this embodiment of the present invention, when it includes a refractive layer, is further explained as follows:
[0046] Figure 5 and Figure 6 This is a schematic diagram of the layer structure when the refractive layer 8 is placed on the surface of the distal end of the lens module, F1. Specifically, as shown... Figure 5 As shown, when the input grating 1 and the output grating 2 are disposed at a distance on the surface of the optical waveguide layer 5 on the far-eye side F1, the protective layer 6 is bonded to the surface of the optical waveguide layer 5 on the far-eye side F1 through the first transparent filler layer 7, and the refractive layer 8 is bonded to the surface of the protective layer 6 on the far-eye side F1 through the second transparent filler layer 9. Figure 5 In Figure a, the refractive layer 8 is a concave lens. Figure 5 In Figure b, the refractive layer 8 is a convex lens. Figure 5 In the lens module shown, the surface of the near-eye side F2 of the optical waveguide layer 5 is the same as the surface of the near-eye side F2 of the lens module. That is, the anti-glare layer 3 is disposed on the surface of the near-eye side F2 of the optical waveguide layer 5 and is located between the coupling grating 1 and the coupling grating 2.
[0047] like Figure 6 As shown, when the coupling grating 1 and the coupling grating 2 are disposed on the surface of the optical waveguide layer 5 near the eye F2, the protective layer 6 is bonded to the surface of the optical waveguide layer 5 near the eye F2 through the first transparent filler layer 7, and the refractive layer 8 is bonded to the surface of the optical waveguide layer 5 far from the eye F1 through the second transparent filler layer 9. Figure 6 In Figure a, the refractive layer 8 is a concave lens. Figure 6 In Figure b, the refractive layer 8 is a convex lens. Figure 6 In the lens module shown, the surface of the protective layer 6 near the eye F2 is the same as the surface of the lens module near the eye F2. That is, the anti-glare layer 3 is disposed on the surface of the protective layer 6 near the eye F2 and is located between the coupling grating 1 and the coupling grating 2.
[0048] By placing the refractive layer 8 on the far eye side F1, on the one hand, the focusing space of the refractive layer 8 is wider (there is enough space to make the thickness of the refractive layer 8 greater), and on the other hand, when the lens module is made into glasses, there is more space between the lens module and the human eye, improving comfort. When the refractive layer 8 is placed on the far eye side F1, the anti-glare layer 3 is placed on the surface of the near eye side F2 of the lens module, so there is no need to reset the anti-glare layer 3 after replacing the refractive layer 8.
[0049] Figure 7 and Figure 8 This is a schematic diagram of the layer structure when the refractive layer 8 is placed on the surface of the near-eye side F2 of the lens module. Specifically, as shown... Figure 7 As shown, when the input grating 1 and the output grating 2 are disposed on the surface of the optical waveguide layer 5 on the far-eye side F1, the protective layer 6 is bonded to the surface of the optical waveguide layer 5 on the far-eye side F1 through the first transparent filler layer 7, and the refractive layer 8 is bonded to the surface of the optical waveguide layer 5 on the near-eye side F2 through the connecting layer 10. Figure 7In Figure a, the refractive layer 8 is a concave lens. Figure 7 In Figure b, the refractive layer 8 is a convex lens. Figure 7 In the lens module shown, the surface of the near-eye side F2 of the refractive layer 8 is the same as the surface of the near-eye side F2 of the lens module. That is, the anti-glare layer 3 is disposed on the surface of the near-eye side F2 of the refractive layer 8 and is located between the coupling grating 1 and the coupling grating 2.
[0050] like Figure 8 As shown, when the coupling grating 1 and the coupling grating 2 are disposed at a distance on the surface of the optical waveguide layer 5 near the eye F2, the protective layer 6 is bonded to the surface of the optical waveguide layer 5 near the eye F2 through the first transparent filler layer 7, and the refractive layer 8 is bonded to the surface of the protective layer 6 near the eye F1 through the connecting layer 10. Figure 8 In Figure a, the refractive layer 8 is a concave lens. Figure 8 In Figure b, the refractive layer 8 is a convex lens. Figure 8 In the lens module shown, the surface of the near-eye side F2 of the refractive layer 8 is the same as the surface of the near-eye side F2 of the lens module. That is, the anti-glare layer 3 is disposed on the surface of the near-eye side F2 of the refractive layer 8 and is located between the coupling grating 1 and the coupling grating 2.
[0051] It should be noted that the connecting layer 10 can be an optically transparent adhesive, or it can be a structure that enables the refractive layer 8 and the protective layer 6 to be detachably connected. For example, the connecting layer 10 can be a transparent magnetic layer, such as an ultrathin iron oxide film prepared by magnetron sputtering or other processes. Of course, it can also be other transparent magnetic materials. By setting the connecting layer 10 as a detachable magnetic layer, the refractive layer 8 can be easily replaced to meet the needs of people with hyperopia and myopia to replace the refractive layer.
[0052] By placing the refractive layer 8 on the near-eye side F2 of the lens module, on the one hand, the area of the anti-glare layer 3 can be determined when configuring the refractive layer 8 according to the user's biometrics. This allows the anti-glare layer 3 to be placed on the refractive layer 8, eliminating the need to place it on the protective layer 6 or the more precise waveguide layer 5. This avoids the defects that would occur when placing the anti-glare layer 3 on the more precise waveguide layer 5, thus reducing costs. On the other hand, since the refractive layer 8 is closer to the human eye, the vision correction effect is better compared to placing it on the far-eye side. The refractive layer 8 can also be made thinner, reducing the overall weight of the lens module.
[0053] This utility model embodiment also provides a near-eye display device. For example, the near-eye display device can be AR glasses. The near-eye display device includes the lens module provided in the above embodiment, and also includes a frame module and an optical engine module. The lens module is installed on the frame module, and the optical engine module is connected to the frame module. The optical engine module is used to couple light signals to the coupling grating of the lens module.
[0054] In near-eye display devices, an anti-glare layer is provided on at least a portion of the surface of the lens module on the near-eye side, between the ingress grating and the egress grating. This anti-glare layer can scatter light incident on the near-eye side surface, reducing the reflected light that reaches the eye. This eliminates reflected light spots and image interference formed on the near-eye side surface of the lens, improves the clarity of the image coupled out by the egress grating, and enhances the user experience when using near-eye display devices such as AR glasses.
[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for the purpose of clarifying the device. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0056] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.
Claims
1. A lens module, characterized in that, The lens module has a near-eye side and a far-eye side and includes a coupling grating (1) and a coupling grating (2) arranged at a distance from each other. An anti-glare layer (3) is provided on at least a portion of the surface of the near-eye side of the lens module between the coupling grating (1) and the coupling grating (2).
2. The lens module according to claim 1, characterized in that, The lens module includes an optical waveguide layer (5) and a protective layer (6). The coupling grating (1) and the coupling grating (2) are disposed on the optical waveguide layer (5) at a distance. The protective layer (6) is bonded to the surface of the optical waveguide layer (5) on which the coupling grating (1) and the coupling grating (2) are disposed through a first transparent filler adhesive layer (7).
3. The lens module according to claim 2, characterized in that, The coupling grating (1) and the coupling grating (2) are disposed at a distance on the far-eye side surface of the optical waveguide layer (5), and the protective layer (6) is bonded to the far-eye side surface of the optical waveguide layer (5) through a first transparent filler adhesive layer (7).
4. The lens module according to claim 2, characterized in that, The coupling grating (1) and the coupling grating (2) are disposed at a distance on the near-eye side surface of the optical waveguide layer (5). The protective layer (6) is bonded to the near-eye side surface of the optical waveguide layer (5) through a first transparent filler layer (7). The anti-glare layer (3) is disposed on the near-eye side surface of the protective layer (6).
5. The lens module according to claim 3, characterized in that, It also includes a refractive layer (8), which is bonded to the distal surface of the protective layer (6) via a second transparent filler layer (9).
6. The lens module according to claim 3, characterized in that, It also includes a refractive layer (8), which is connected to the near-eye surface of the optical waveguide layer (5) through a connecting layer (10). The anti-glare layer (3) is disposed on the near-eye surface of the refractive layer (8) and is located between the coupling grating (1) and the coupling grating (2).
7. The lens module according to claim 4, characterized in that, It also includes a refractive layer (8), which is bonded to the distal surface of the optical waveguide layer (5) via a second transparent filler layer (9).
8. The lens module according to claim 4, characterized in that, It also includes a refractive layer (8), which is connected to the near-eye surface of the protective layer (6) via a connecting layer (10). The anti-glare layer (3) is disposed on the near-eye surface of the refractive layer (8) and is located between the coupling grating (1) and the coupling grating (2).
9. A near-eye display device, characterized in that, include: The lens module as described in any one of claims 1-8; A frame module, wherein the lens module is mounted on the frame module; An optical engine module is connected to the lens frame module and is used to couple optical signals into the coupling grating of the lens module.
10. The near-eye display device according to claim 9, characterized in that, The near-eye display device is AR glasses.