Optical waveguide device and AR display equipment

Abstract

The utility model discloses an optical waveguide device and AR display equipment, and the device comprises a first waveguide layer which is provided with a first surface, and the first surface is provided with a first grating structure; the second waveguide layer is provided with a second surface, the second surface is opposite to the first surface, and the second surface is provided with a second grating structure; the isolation layer is arranged between the first waveguide layer and the second waveguide layer, and the isolation layer is used for preventing light crosstalk between the first waveguide layer and the second waveguide layer; the first adhesive layer covers the first surface and fills a gap between the first surface and the isolation layer, so that the first waveguide layer and the isolation layer are hermetically attached; and the second adhesive layer covers the second surface and fills a gap between the second surface and the isolation layer, so that the second waveguide layer and the isolation layer are hermetically attached. The first waveguide layer and the second waveguide layer are prevented from generating relative deformation to influence the visual effect presented in human eyes, so that the stability and the reliability of the waveguide display effect are improved.

Description

Technical Field

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

[0002] The optical module of an augmented reality (AR) near-eye display device usually consists of two parts: an optical engine (or light engine) and an optical combiner. The optical engine consists of an image source and a projection lens. The image source is used to generate the image to be displayed, and the projection lens projects the image displayed by the image source to infinity or a specified distance. The optical combiner can transmit the signal light emitted by the optical engine in a directionally directed manner to the human eye, forming the image to be displayed on the retina; at the same time, the optical combiner has good transmittance to the ambient light in the real world. Through the optical combiner, the human eye can see the real-world scenery and the image projected by the optical engine at the same time. Diffraction optical waveguides are the preferred solution for optical combiners due to their thin thickness, light weight and good light transmittance.

[0003] Existing diffraction optical waveguides are usually composed of several stacked waveguide layers with gap layers between them. When the air pressure in the gap layer is lower than the external air pressure or is subjected to external forces, the waveguide layers may deform. In severe cases, interference may occur in some areas, thereby generating Newton rings and affecting the visual effect presented to the human eye. Utility Model Content

[0004] In view of this, the present application proposes an optical waveguide device that can prevent the relative deformation between the first waveguide layer and the second waveguide layer from affecting the visual effect presented to the human eye, thereby improving the stability and reliability of the waveguide display effect.

[0005] In a first aspect, the present application provides an optical waveguide device, comprising:

[0006] A first waveguide layer having a first surface, wherein the first surface is provided with a first grating structure;

[0007] a second waveguide layer having a second surface, the second surface being arranged opposite to the first surface, and the second surface being provided with a second grating structure;

[0008] an isolation layer, disposed between the first waveguide layer and the second waveguide layer, the isolation layer being used to prevent light crosstalk between the first waveguide layer and the second waveguide layer;

[0009] a first adhesive layer covering the first surface and filling a gap between the first surface and the isolation layer, so as to ensure a sealing fit between the first waveguide layer and the isolation layer;

[0010] The second adhesive layer covers the second surface and fills the gap between the second surface and the isolation layer, so that the second waveguide layer and the isolation layer are sealed and adhered.

[0011] In some embodiments, the refractive index of the first adhesive layer is greater than the refractive index of the isolation layer; and / or the refractive index of the second adhesive layer is greater than the refractive index of the isolation layer.

[0012] In some embodiments, the refractive index of the isolation layer is 1.15-1.2.

[0013] In some embodiments, the thickness of the first adhesive layer is greater than or equal to the thickness of the first grating structure; and / or the thickness of the second adhesive layer is greater than or equal to the thickness of the second grating structure.

[0014] In some embodiments, the first surface includes a first area where the first grating structure is provided and a second area where the first grating structure is not provided, and the first adhesive layer covers the second area and extends to the edge or surface of the first grating structure; and / or, the second surface includes a third area where the second grating structure is provided and a fourth area where the second grating structure is not provided, and the second adhesive layer covers the fourth area and extends to the edge or surface of the second grating structure.

[0015] In some embodiments, the isolation layer includes: a substrate; a low-fold adhesive coated on the substrate, wherein the refractive index of the low-fold adhesive is smaller than the refractive index of the first adhesive layer and the second adhesive layer; and an adhesive for adhering the substrate coated with the low-fold adhesive between the first waveguide layer and the second waveguide layer to prevent light crosstalk between the first waveguide layer and the second waveguide layer.

[0016] In some embodiments, the optical waveguide device further includes: a first protective layer, disposed between the first surface and the isolation layer, the first protective layer being tightly adhered to the first surface via the first adhesive layer; and a second protective layer, disposed between the second surface and the isolation layer, the second protective layer being tightly adhered to the second surface via the second adhesive layer.

[0017] In some embodiments, the first protective layer is configured to be bonded to the first surface through the first adhesive layer under vacuum conditions; and / or the second protective layer is configured to be bonded to the second surface through the second adhesive layer under vacuum conditions.

[0018] In some embodiments, the material of the first protective layer is resin, glass or silicon wafer; and / or the material of the second protective layer is resin, glass or silicon wafer.

[0019] A second aspect of the present application provides an AR display device, comprising the above-mentioned optical waveguide device.

[0020] The optical waveguide device proposed in this application can prevent light crosstalk between the first waveguide layer and the second waveguide layer by providing an isolation layer. The first adhesive layer and the second adhesive layer can fill the gap between the first waveguide layer and the second waveguide layer, thereby achieving a sealed fit between the first waveguide layer and the second waveguide layer. The absence of a gap layer prevents relative deformation of the first waveguide layer and the second waveguide layer from affecting the visual effect presented to the human eye, thereby improving the stability and reliability of the waveguide display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained from these drawings without any creative work.

[0022] Figure 1 It is a structural diagram of an optical module in the prior art;

[0023] Figure 2 This is a schematic diagram of the structure of an optical module in the prior art when it is deformed;

[0024] Figure 3 A schematic structural diagram of the optical waveguide device proposed in this application;

[0025] Figure 4 A schematic structural diagram of another embodiment of the optical waveguide device proposed in this application;

[0026] Figure 5 This is a schematic diagram of the optical waveguide device proposed in this application undergoing glue exposure.

[0027] Description of reference numerals:

[0028] 1. Optical machine; 2. Diffractive optical waveguide; 3. Waveguide layer; 4. Adhesive; 5. Incoupling grating; 6. Outcoupling grating; 7. Gap layer;

[0029] 100, optical waveguide device; 10, first waveguide layer; 11, first surface; 12, first grating structure; 121, first incoupling grating; 122, first outcoupling grating; 20, second waveguide layer; 21, second surface; 22, second grating structure; 221, second incoupling grating; 222, second outcoupling grating; 30, isolation layer; 40, first adhesive layer; 50, second adhesive layer; 60, first protective layer; 70, second protective layer; 200, mask; 300, exposure light source. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0031] It should be understood that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0032] It should also be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0033] The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. For example, the terms "first," "second," and so on 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. Therefore, the term "first" or "second" may explicitly or implicitly include at least one of the features.

[0034] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0035] See also Figure 1 and Figure 2 , the optical module of the augmented reality (AR) near-eye display device usually consists of two parts: an optical machine 1 (or called a light engine) and an optical combiner. The optical machine 1 consists of an image source and a projection lens. The image source is used to generate the image to be displayed, and the projection lens projects the image displayed by the image source to infinity or a specified distance. The optical combiner can transmit the signal light emitted by the optical machine 1 in a directionally transmitted manner to the human eye, forming an image to be displayed on the retina; at the same time, the optical combiner has good transmittance to the ambient light in the real world. Through the optical combiner, the human eye can see the real-world scenery and the image projected by the optical machine 1 at the same time. The diffraction optical waveguide 2 is a preferred solution for the optical combiner due to its thin thickness, light weight and good light transmittance.

[0036] An existing diffraction optical waveguide 2 typically consists of several waveguide layers 3 and an adhesive 4 for bonding the waveguide layers 3. The adhesive 4 is only used to bond the edges of the waveguide layers 3, thereby creating a certain gap between the waveguide layers 3. Each waveguide layer 3 is provided with an in-coupling grating 5 and an out-coupling grating 6. The in-coupling grating 5 is used to couple light emitted by the light engine into the waveguide layer 3 for total internal reflection. After total internal reflection within the waveguide layer 3, the light is transmitted to the out-coupling grating 6, which diffracts the light within the waveguide layer 3 into free space. Once the light enters the human eye, it forms a virtual image to be displayed on the retina. Damage or contamination to the grating structure can affect the overall display effect. Therefore, the grating structure is not directly exposed on the outermost layer. That is, the grating structure is provided on the side of the waveguide layer 3 opposite to the other waveguide layer 3. In this case, a gap layer 7 is provided between the waveguide layers 3. When the air pressure in the gap layer 7 is lower than the external air pressure or is subjected to external forces, the waveguide layers 3 may deform (e.g., Figure 2 In severe cases, it may cause interference in some areas, resulting in Newton rings, which will affect the visual effects presented to the human eye, such as image clarity, light diffraction efficiency, and ghosting.

[0037] Therefore, if Figure 3 and Figure 4 As shown, the embodiment of the present application provides an optical waveguide device 100 that can prevent the relative deformation between the first waveguide layer 10 and the second waveguide layer 20 from affecting the visual effect presented to the human eye, thereby improving the stability and reliability of the waveguide display effect.

[0038] See also Figure 4 The present invention provides an optical waveguide device 100, comprising a first waveguide layer 10, a second waveguide layer 20, an isolation layer 30, a first adhesive layer 40, and a second adhesive layer 50. The first waveguide layer 10 has a first surface 11, on which a first grating structure 12 is provided. The second waveguide layer 20 has a second surface 21, which is disposed opposite the first surface 11 and on which a second grating structure 22 is provided. The isolation layer 30 is disposed between the first waveguide layer 10 and the second waveguide layer 20 to prevent light crosstalk between the first waveguide layer 10 and the second waveguide layer 20. The first adhesive layer 40 covers the first surface 11 and fills the gap between the first surface 11 and the isolation layer 30, thereby ensuring a sealed connection between the first waveguide layer 10 and the isolation layer 30. The second adhesive layer 50 covers the second surface 21 and fills the gap between the second surface 21 and the isolation layer 30, thereby ensuring a sealed connection between the second waveguide layer 20 and the isolation layer 30.

[0039] The optical waveguide device 100 proposed in the embodiment of the present application can prevent light crosstalk between the first waveguide layer 10 and the second waveguide layer 20 by providing the isolation layer 30. The first adhesive layer 40 and the second adhesive layer 50 can fill the gap between the first waveguide layer 10 and the second waveguide layer 20, thereby achieving a sealed bond between the first waveguide layer 10 and the second waveguide layer 20 without the presence of a gap layer. In other words, the first waveguide layer 10 and the second waveguide layer 20 are fully bonded, thereby preventing relative deformation of the first waveguide layer 10 and the second waveguide layer 20 from affecting the visual effect presented to the human eye, thereby improving the stability and reliability of the waveguide display effect.

[0040] It can be understood that the first adhesive layer 40 and the second adhesive layer 50 are formed by curing the glue. Since the first adhesive layer 40 and the second adhesive layer 50 are solid after curing, at room temperature and pressure, the Young's modulus of the first adhesive layer 40 and the second adhesive layer 50 is greater than that of air. This is because the molecular structure of the solid is more compact and the interaction force between molecules is stronger. Therefore, it is less likely to deform when subjected to external forces, thereby improving the stability and reliability of the waveguide display effect.

[0041] For example, Figure 3 and Figure 4 As shown, the first grating structure 12 includes a first in-coupling grating 121 and a first out-coupling grating 122, and the second grating structure 22 includes a second in-coupling grating 221 and a second out-coupling grating 222. To prevent the grating structures from being damaged or contaminated, which would affect the overall display effect, the first grating structure 12 and the second grating structure 22 are disposed on the inner side of the first waveguide layer 10 and the second waveguide layer 20 relative to each other, thereby preventing the first grating structure 12 and the second grating structure 22 from being damaged or contaminated.

[0042] It should be noted that the optical waveguide device 100 is not limited to having only the first waveguide layer 10 and the second waveguide layer 20 , but may also have a third waveguide layer, a fourth waveguide layer or even more, and each waveguide layer is provided with a grating structure.

[0043] In some embodiments, the refractive index of the first adhesive layer 40 is greater than that of the isolation layer 30, and / or the refractive index of the second adhesive layer 50 is greater than that of the isolation layer 30. Thus, the use of the isolation layer 30 with a low refractive index can simulate the isolation effect of air, thereby preventing light crosstalk between the first waveguide layer 10 and the second waveguide layer 20.

[0044] In some embodiments, the refractive index of the isolation layer 30 is 1.15-1.2. For example, the refractive index of the isolation layer 30 may be 1.15, 1.16, 1.17, 1.18, 1.19, or 1.2. Because an isolation layer 30 with a refractive index that is too low is costly to manufacture, and an isolation layer 30 with a refractive index that is too high cannot effectively prevent light crosstalk, the present embodiment limits the refractive index of the isolation layer 30 to 1.15-1.2. This is easy to implement in terms of process, can prevent light crosstalk between the first waveguide layer 10 and the second waveguide layer 20, and can reduce the cost of the isolation layer 30.

[0045] In some embodiments, the thickness of the first adhesive layer 40 is greater than or equal to the thickness of the first grating structure 12. For example, the thickness of the first adhesive layer 40 may be equal to the thickness of the first grating structure 12, that is, the first adhesive layer 40 does not cover the first grating structure 12, thereby reducing the cost of using the first adhesive layer 40. Of course, in other examples, such as Figure 3 and Figure 4 As shown, the thickness of the first adhesive layer 40 may also be greater than the thickness of the first grating structure 12 , thereby covering the surface of the first grating structure 12 , which is more conducive to filling the gap and improving the bonding effect.

[0046] In some embodiments, the thickness of the second glue layer 50 is greater than or equal to the thickness of the second grating structure 22. Figure 3 and Figure 4 As shown, the thickness of the second adhesive layer 50 can be equal to the thickness of the second grating structure 22, that is, the second adhesive layer 50 does not cover the second grating structure 22, reducing the use cost of the second adhesive layer 50. Of course, in other examples, such as Figure 3 and Figure 4 As shown, the thickness of the second adhesive layer 50 may also be greater than the thickness of the second grating structure 22 , thereby covering the surface of the second grating structure 22 , which is more conducive to filling the gap and improving the bonding effect.

[0047] In some embodiments, the first surface 11 includes a first region where the first grating structure 12 is disposed and a second region where the first grating structure 12 is not disposed. The first adhesive layer 40 covers the second region and extends to the edge or surface of the first grating structure 12. It will be understood that the second region refers to the remaining area of ​​the first surface 11 excluding the area where the first grating structure 12 is disposed. When the thickness of the first adhesive layer 40 is equal to that of the first grating structure 12, the first adhesive layer 40 extends to the edge of the first grating structure 12. When the thickness of the first adhesive layer 40 is greater than that of the first grating structure 12, the first adhesive layer 40 extends to the surface of the first grating structure 12. This prevents the formation of a gap between the first waveguide layer 10 and the second waveguide layer 20, thereby improving the stability and reliability of the waveguide display effect.

[0048] In addition, the first adhesive layer 40 is not filled into the first grating structure 12, which ensures the refractive index difference of the microstructure design. This reduces the refractive index requirement for the first adhesive layer 40, so that the type of glue is not restricted. It can be UV glue, epoxy resin adhesive, organic silicone adhesive, etc. Glue with a wide range of refractive indices can be used, which reduces production costs to a certain extent and is not limited by the refractive index of the glue.

[0049] In some embodiments, the second surface 21 includes a third region where the second grating structure 22 is disposed and a fourth region where the second grating structure 22 is not disposed. The second adhesive layer 50 covers the fourth region and extends to the edge or surface of the second grating structure 22. It will be understood that the fourth region refers to the remaining area of ​​the second surface 21 excluding the area where the second grating structure 22 is disposed. When the thickness of the second adhesive layer 50 is equal to that of the second grating structure 22, the second adhesive layer 50 extends to the edge of the second grating structure 22. When the thickness of the second adhesive layer 50 is greater than that of the second grating structure 22, the second adhesive layer 50 extends to the surface of the second grating structure 22. This prevents the formation of a gap between the first waveguide layer 10 and the second waveguide layer 20, thereby improving the stability and reliability of the waveguide display effect.

[0050] In addition, the second adhesive layer 50 is not filled into the second grating structure 22, ensuring the refractive index difference of the microstructure design. This reduces the refractive index requirement for the second adhesive layer 50, so that the type of glue is not restricted. It can be UV glue, epoxy resin adhesive, organic silicone adhesive, etc. Glue with a wider range of refractive indices can be used, which reduces production costs to a certain extent and is not limited by the refractive index of the glue.

[0051] It should be noted that in this application, the type and parameters of the grating are not limited. The first grating structure 12 and the second grating structure 22 can be gratings with the same period, duty cycle, inclination, depth, and shape, or they can be gratings with different periods or duty cycles or inclinations, or depths or shapes.

[0052] See also Figure 3 In some embodiments, the optical waveguide device 100 further includes a first protective layer 60 and a second protective layer 70. The first protective layer 60 is disposed between the first surface 11 and the isolation layer 30, and is tightly bonded to the first surface 11 via a first adhesive layer 40. The second protective layer 70 is disposed between the second surface 21 and the isolation layer 30, and is tightly bonded to the second surface 21 via a second adhesive layer 50. Thus, the provision of the first protective layer 60 and the second protective layer 70 can provide better protection for the first grating structure 12 and the second grating structure 22.

[0053] In some embodiments, the first protective layer 60 is configured to be bonded to the first surface 11 via the first adhesive layer 40 in an oxygen-free environment or under vacuum conditions. This bonding method neutralizes oxygen in the gaps of the first grating structure 12, improving the adhesion and optical performance between the first waveguide layer 10 and the first protective layer 60. It also increases the rigidity and Young's modulus of the first waveguide layer 10, thereby enhancing the stability of the optical performance. Furthermore, the vacuum bonding ensures that there is essentially no air between the first protective layer 60 and the first waveguide layer 10, preventing deformation due to external pressure or force, thereby improving the stability and reliability of the waveguide display.

[0054] In some embodiments, the first glue layer 40 can be applied to the first protective layer 60 by spin coating. For example, the glue can be evenly spin-coated on the first protective layer 60 by utilizing electrostatic and electromagnetic field adsorption or centrifugal force.

[0055] In some embodiments, the second protective layer 70 is configured to be bonded to the second surface 21 via the second adhesive layer 50 in an oxygen-free environment or under vacuum conditions. This bonding method neutralizes oxygen in the gaps of the second grating structure 22, improving the adhesion and optical performance between the second waveguide layer 20 and the second protective layer 70. It also increases the rigidity and Young's modulus of the second waveguide layer 20, thereby enhancing the stability of the optical performance. Furthermore, the vacuum bonding ensures that there is essentially no air between the second protective layer 70 and the second waveguide layer 20, preventing deformation due to external pressure or force, thereby improving the stability and reliability of the waveguide display.

[0056] In some embodiments, the second glue layer 50 can be applied to the second protective layer 70 by spin coating. For example, the glue can be evenly spin-coated on the second protective layer 70 by utilizing electrostatic and electromagnetic field adsorption or centrifugal force.

[0057] Exemplarily, both the first grating structure 12 and the second grating structure 22 are grating micro-nano structures manufactured using micro-nano processing technology.

[0058] In some embodiments, the viscosity of the glue between the first adhesive layer 40 and the second adhesive layer 50 can be increased by adjusting the physical properties of the glue, such as temperature, humidity, and ultraviolet light, so that the glue can maintain its shape under external force, and prevent the glue from overflowing into the grating micro-nano structure in the non-exposed area during the full bonding process, so that the duty cycle of the grating micro-nano structure remains unchanged from the designed value. At the same time, the total internal reflection formed between the first waveguide layer 10 and the first protective layer 60 and between the second waveguide layer 20 and the second protective layer 70 is not affected, and the bonding between the first waveguide layer 10 and the first protective layer 60 and between the second waveguide layer 20 and the second protective layer 70 is not affected.

[0059] In a specific application, when performing glue exposure, a mask 200 corresponding to the position of the grating micro-nano structure is prepared for exposure. Figure 5 As shown ( Figure 5 The exposed areas shown may be the first coupling-in grating 121 and the first coupling-out grating 122 corresponding to the first adhesive layer 40, or the exposed areas of the second coupling-in grating 221 and the second coupling-out grating 222 corresponding to the second adhesive layer 50. After the glue in the grating micro-nano structure area is exposed, it becomes solid, and the non-grating structure area maintains the liquid state and glue viscosity. The main function of exposing the glue in the grating area is that during the full bonding process, the glue in the exposed area has become solid, so that even under the influence of external force, the solid glue will not penetrate into the grating micro-nano structure. After the first protective layer 60 is attached to the first waveguide layer 10 via the first adhesive layer 40, and the second protective layer 70 is attached to the second waveguide layer 20 via the second adhesive layer 50, and then the isolation layer 30 is attached to the first protective layer 60 and the second protective layer 70, so that the first waveguide layer 10 and the second waveguide layer 20 are integrally assembled, the adhesive in the non-grating structure regions of the first adhesive layer 40 and the second adhesive layer 50 is cured by an exposure light source 300 under a high temperature and high pressure environment to seal the first waveguide layer 10 and the second waveguide layer 20 together. This ensures that the optical performance and appearance of the optical waveguide device 100 are not affected even in harsh environments. Furthermore, relative deformation of the first waveguide layer 10 and the second waveguide layer 20 that would affect the visual effect presented to the human eye is avoided, thereby improving the stability and reliability of the waveguide display effect.

[0060] In some embodiments, the first protective layer 60 is made of resin, glass, or silicon wafer, and / or the second protective layer 70 is made of resin, glass, or silicon wafer. The first protective layer 60 and the second protective layer 70 can each be made of one of the materials, such as resin, glass, or silicon wafer. Resin, as an organic polymer material, has high transparency, high refractive index, high heat resistance, and good processability. Glass has very low light loss and is easy to process. Silicon wafers have good thermal stability.

[0061] See also Figure 4 Of course, in other embodiments, the optical waveguide device 100 may not be provided with the first protective layer and the second protective layer, that is, the first adhesive layer 40 and the second adhesive layer 50 are directly and tightly attached to the isolation layer 30 .

[0062] In some embodiments, the isolation layer 30 includes a substrate, a low-fold adhesive, and an adhesive. The low-fold adhesive is applied to the substrate, and the refractive index of the low-fold adhesive is lower than that of the first adhesive layer 40 and the second adhesive layer 50. The adhesive is used to adhere the substrate between the first protective layer 60 and the second protective layer 70 to prevent light crosstalk between the first waveguide layer 10 and the second waveguide layer 20. The substrate can be made of polyester film or other thin films. Polyester film has excellent transparency, heat resistance, and chemical resistance. The low-fold adhesive can form a low-refractive-index isolation layer 30, ensuring that the refractive index of the isolation layer 30 meets the low-refractive-index requirement. The isolation layer 30 can be adhered to the target object by adhesive. When the optical waveguide device 100 is provided with a first protective layer 60 and a second protective layer 70, the isolation layer 30 can be adhered between the first protective layer 60 and the second protective layer 70 by adhesive. When the optical waveguide device 100 is not provided with a first protective layer 60 and a second protective layer 70, the isolation layer 30 can be adhered between the first adhesive layer 40 and the second adhesive layer 50 by adhesive.

[0063] For example, the adhesive may be a pressure-sensitive adhesive or other adhesive capable of achieving bonding. The pressure-sensitive adhesive is an adhesive that can achieve rapid and strong bonding under slight pressure, and can facilitate bonding of the isolation layer 30 to the target object.

[0064] Exemplarily, the low-fold adhesive includes embossed adhesive and low-fold glue, which are mixed evenly and then coated on a polyester film to form the low-fold adhesive.

[0065] The present application also provides an AR display device including the aforementioned optical waveguide device 100. The AR display device further includes an optical engine configured to emit light corresponding to an image to be displayed. The optical waveguide device 100 is configured to direct the light emitted by the optical engine to a target area, allowing the light to enter the eyes of a user wearing the AR display device in the target area, thereby enabling the user to observe the corresponding image. Specifically, the AR display device is, for example, AR glasses.

[0066] Those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without mutual contradiction.

[0067] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An optical waveguide device, characterized in that include: A first waveguide layer having a first surface, wherein the first surface is provided with a first grating structure; a second waveguide layer having a second surface, the second surface being arranged opposite to the first surface, and the second surface being provided with a second grating structure; an isolation layer, disposed between the first waveguide layer and the second waveguide layer, the isolation layer being used to prevent light crosstalk between the first waveguide layer and the second waveguide layer; a first adhesive layer covering the first surface and filling a gap between the first surface and the isolation layer, so as to ensure a sealing fit between the first waveguide layer and the isolation layer; The second adhesive layer covers the second surface and fills the gap between the second surface and the isolation layer, so that the second waveguide layer and the isolation layer are sealed and adhered.

2. The optical waveguide device according to claim 1, wherein The refractive index of the first adhesive layer is greater than the refractive index of the isolation layer; and / or, The refractive index of the second adhesive layer is greater than the refractive index of the isolation layer.

3. The optical waveguide device according to claim 1, wherein The refractive index of the isolation layer is 1.15-1.

2.

4. The optical waveguide device according to claim 1, wherein The thickness of the first adhesive layer is greater than or equal to the thickness of the first grating structure; and / or, The thickness of the second glue layer is greater than or equal to the thickness of the second grating structure.

5. The optical waveguide device according to claim 1, wherein The first surface includes a first area provided with the first grating structure and a second area not provided with the first grating structure, and the first adhesive layer covers the second area and extends to the edge or surface of the first grating structure; and / or, The second surface includes a third area provided with the second grating structure and a fourth area not provided with the second grating structure. The second adhesive layer covers the fourth area and extends to the edge or surface of the second grating structure.

6. The optical waveguide device according to claim 1, wherein The isolation layer comprises: substrate; A low-fold adhesive is applied on the substrate, wherein the refractive index of the low-fold adhesive is smaller than the refractive indexes of the first adhesive layer and the second adhesive layer; The adhesive is used to adhere the substrate coated with the low-fold adhesive between the first waveguide layer and the second waveguide layer to prevent light crosstalk between the first waveguide layer and the second waveguide layer.

7. The optical waveguide device according to claim 1, wherein The optical waveguide device further comprises: a first protective layer, disposed between the first surface and the isolation layer, the first protective layer being tightly adhered to the first surface via the first adhesive layer; The second protective layer is provided between the second surface and the isolation layer, and the second protective layer is tightly adhered to the second surface via the second adhesive layer.

8. The optical waveguide device according to claim 7, wherein The first protective layer is configured to be bonded to the first surface through the first adhesive layer under vacuum conditions; and / or, The second protective layer is configured to be bonded to the second surface through the second adhesive layer under vacuum conditions.

9. The optical waveguide device according to claim 7, wherein The material of the first protective layer is resin, glass or silicon wafer; and / or, The second protective layer is made of resin, glass or silicon wafer.

10. An AR display device, characterized in that: The optical waveguide device comprises the optical waveguide device according to any one of claims 1 to 9.

Images