Waveguide plate module, preparation method thereof and augmented reality equipment

Abstract

The invention relates to the technical field of augmented reality, in particular to a waveguide sheet module, a preparation method thereof and augmented reality equipment. The waveguide sheet module comprises a first waveguide sheet, a second waveguide sheet, a first supporting piece and a first connecting piece; the first supporting piece is located between the first main body part and the second main body part and comprises a light reflecting layer and a sub-supporting structure which are stacked, and the side, away from the sub-supporting structure, of the light reflecting layer and the side, away from the light reflecting layer, of the sub-supporting structure abut against the first waveguide sheet and the second waveguide sheet respectively. According to the invention, the problem that displayed images are not overlapped due to local unparallelism of the first waveguide sheet and the second waveguide sheet is prevented, the problem of RGB separation is avoided, and meanwhile, the problems of light leakage and reduction of the lighting effect and brightness uniformity of the displayed images can be improved.

Description

Technical Field

[0001] The present application relates to the field of augmented reality technology, and particularly relates to a waveguide sheet module, a preparation method thereof, and an augmented reality device. Background Art

[0002] The AR technology can be experienced through an augmented reality (AR) device. The waveguide sheet module is an important component of the AR device, which is used to transmit the optical signal incident on the waveguide sheet module and perform one-dimensional or two-dimensional pupil expansion on the image information in the optical signal. In order to reduce the weight of the AR device and improve the drop reliability of the waveguide sheet module, the waveguide sheet can be made of a polymer material to replace the traditional glass. However, the refractive index of the polymer material currently used as the waveguide sheet is relatively lower than that of glass. If a color display effect is to be achieved, at least two waveguide sheets are required to cooperate. However, when two waveguide sheets cooperate, image misregistration is likely to occur, resulting in RGB separation. If an attempt is made to solve the problem of image misregistration caused by two waveguide sheets, problems such as light leakage and a decrease in the light effect and brightness uniformity of the displayed image will arise. Summary of the Invention

[0003] Based on this, the present application provides a waveguide sheet module, a preparation method thereof, and an augmented reality device, which can solve the problem of image misregistration caused by two waveguide sheets while improving the problems of light leakage and a decrease in the light effect and brightness uniformity of the displayed image.

[0004] The first aspect of the present application provides a waveguide sheet module, and its technical solution is as follows:

[0005] A waveguide sheet module, comprising:

[0006] A first waveguide sheet, having a first main body portion and a first peripheral portion surrounding the first main body portion;

[0007] A second waveguide sheet, stacked and spaced apart from the first waveguide sheet, having a second main body portion corresponding to the first main body portion and a second peripheral portion corresponding to the first peripheral portion;

[0008] A first support member, located between the first main body portion and the second main body portion, comprising a stacked light reflection layer and a sub-support structure, wherein one side of the light reflection layer facing away from the sub-support structure and one side of the sub-support structure facing away from the light reflection layer respectively abut against the first waveguide sheet and the second waveguide sheet;

[0009] A first connecting member, located between the first peripheral portion and the second peripheral portion, connecting the first waveguide sheet and the second waveguide sheet.

[0010] The second aspect of the present application provides a preparation method of a waveguide sheet module, and its technical solution is as follows:

[0011] A preparation method of a waveguide sheet module, comprising the following steps:

[0012] Provide a first waveguide sheet and a second waveguide sheet. The first waveguide sheet has a first main body portion and a first peripheral portion surrounding the first main body portion. The second waveguide sheet has a second main body portion corresponding to the first main body portion and a second peripheral portion corresponding to the first peripheral portion;

[0013] Form a light reflection layer on the first main body portion or the second main body portion, and form the sub-support structure on the light reflection layer. The light reflection layer and the sub-support structure form a first support member;

[0014] Align and cover the first waveguide sheet and the second waveguide sheet, so that the first support member is located between the first main body portion and the second main body portion, and the side of the light reflection layer facing away from the sub-support structure and the side of the sub-support structure facing away from the light reflection layer respectively abut against the first waveguide sheet and the second waveguide sheet, and use a first connecting member located between the first peripheral portion and the second peripheral portion to bond the first waveguide sheet and the second waveguide sheet.

[0015] The third aspect of the present application provides an augmented reality device, and its technical solution is as follows:

[0016] An augmented reality device, comprising a projection optical machine and the waveguide sheet module as described above;

[0017] The projection optical machine is used to project an optical signal, and the optical signal includes image information;

[0018] The waveguide sheet module is used to transmit the optical signal.

[0019] The present application has the following beneficial effects:

[0020] In the present application, a first support member is provided between the main body portions of the first waveguide sheet and the second waveguide sheet, which can ensure the parallelism of the first waveguide sheet and the second waveguide sheet, improve the problem of local non-parallelism of the first waveguide sheet and the second waveguide sheet, prevent the images displayed from not coinciding due to the local non-parallelism of the first waveguide sheet and the second waveguide sheet, avoid the problem of RGB separation, and is beneficial to improving the user experience. At the same time, the first support member includes a stacked light reflection layer and a sub-support structure. The light reflection layer is in contact with the first waveguide sheet or the second waveguide sheet. When the light propagating in the first waveguide sheet or the second waveguide sheet is incident on the light reflection layer, most of it can be reflected by the light reflection layer and not refracted by the first support member, improving the problems of light leakage and the decline of the light effect and brightness uniformity of the displayed image. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present application and more fully understand the present application and its beneficial effects, the following will briefly introduce the attached drawings required for the description of the embodiments. Obviously, the attached drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other attached drawings can also be obtained based on these attached drawings.

[0022] Figure 1 Schematic diagram of the included angle between the extended surfaces of the blue sheet and the red sheet;

[0023] Figure 2 Live view of the projection image at different included angles between the extended surfaces of the blue sheet and the red sheet;

[0024] Figure 3 Schematic diagram of the principle of light leakage, light effect of the displayed image, and reduction in brightness uniformity;

[0025] Figure 4 Schematic diagram of the structure of a waveguide sheet module in an embodiment;

[0026] Figure 5 Schematic diagram of the structure of the first waveguide sheet in Example 1;

[0027] Figure 6 Schematic diagram of the structure of the first waveguide sheet in Example 2;

[0028] Figure 7 Schematic diagram of the principle of the light reflection layer improving light leakage, light effect of the displayed image, and reduction in brightness uniformity in an embodiment;

[0029] Figure 8 Schematic diagram of the principle of point contact improving light leakage, light effect of the displayed image, and reduction in brightness uniformity in an embodiment;

[0030] Figure 9 Schematic diagram of the distribution of the first support member in an example;

[0031] Figure 10 Live view of the ghost image caused by the local non - parallelism between the first protective layer and the first waveguide sheet;

[0032] Figure 11 Schematic diagram of the preparation method of a waveguide sheet module in an embodiment;

[0033] Figure 12 Schematic diagram of the structure of an augmented reality device in an embodiment;

[0034] Figure 13 For Figure 12 The sectional structure schematic diagram along the D - D direction in Detailed implementation manners

[0035] The present application will be further described in detail below in conjunction with specific embodiments. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0037] The term

[0038] Unless otherwise stated or there is a contradiction, the terms or phrases used in this application have the following meanings:

[0039] In this application, the selection range involving "and / or", "or / and", "and / or" includes any one of two or more related listed items, and also includes any and all combinations of the related listed items. The said any and all combinations include combinations of any two related listed items, any more related listed items, or all related listed items.

[0040] In this application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined. In this application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise specifically defined.

[0041] In this application, the terms "optionally", "optional", "optional" mean that it can be either present or absent, that is, it refers to any one of the two parallel options of "present" or "absent". If "optional" appears multiple times in a technical solution, unless otherwise specified, and there is no contradiction or mutual restriction relationship, each "optional" is independent of each other.

[0042] In this application, in relation to "the first aspect", "the second aspect", "the third aspect", "the fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumerative description and should be understood not to constitute a closed limitation on quantity.

[0043] In this application, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0044] In this application, when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. It should also be understood that when interpreting the connection relationship or positional relationship of elements, although not explicitly described, the connection relationship and positional relationship are interpreted to include an error range, and this error range should be within the acceptable deviation range of a specific value determined by those skilled in the art.

[0045] Currently, the concept of the metaverse is becoming increasingly popular, and the industries related to it have also started to develop rapidly. The metaverse provides an immersive experience based on extended reality technology, generates a mirror image of the real world based on digital twin technology, builds an economic system based on blockchain technology, closely integrates the virtual world and the real world in the economic system, social system, and identity system, and allows each user to produce content and edit the world. Among them, extended reality technology (XR) is the foundation of the metaverse, including virtual reality technology (VR), augmented reality technology (AR), and mixed reality technology (MR), etc.

[0046] The above technologies can be experienced through smart wearable devices. For example, AR technology can be experienced through augmented reality (AR) devices. The waveguide sheet module is an important component of AR devices, which is used to transmit the optical signal incident on the waveguide sheet module and perform one-dimensional or two-dimensional pupil expansion on the image information in the optical signal. In order to reduce the weight of AR devices and improve the drop reliability of the waveguide sheet module, the waveguide sheet can be made of polymer materials to replace traditional glass. However, the refractive index of the polymer materials currently used as waveguide sheets is relatively low compared to glass, usually not exceeding 1.74. If a color display effect is to be achieved, at least two waveguide sheets are required to cooperate. One mainly conducts blue light and part of the green light, which is called the blue sheet; the other mainly conducts red light and part of the green light, which is called the red sheet. However, when two waveguide sheets cooperate, it is easy to produce image non-coincidence and RGB separation.

[0047] The inventors of the present application analyzed the reason why image non - coincidence is likely to occur when two waveguide sheets are combined, and believed that this phenomenon is related to the insufficient parallelism of the two waveguide sheets. The materials of the blue sheet and the red sheet are both polymer materials, which have relatively poor stiffness compared to glass. Moreover, the thicknesses of the blue sheet and the red sheet are small, and warping deformation from the center to the periphery is likely to occur, resulting in local non - parallelism of the two waveguide sheets and poor overall parallelism. Please refer to Figure 1 and Figure 2 , when the extension planes of the blue sheet 1 and the red sheet 2 intersect and the included angle θ is 0.5°, an image non - coincidence phenomenon as shown in Figure 2 a occurs. If the projected image is a mixed color, such as purple, the displayed image will have a blue image and a red image, and the blue image and the red image do not coincide, that is, RGB separation; when the extension planes of the blue sheet 1 and the red sheet 2 intersect and the included angle θ is 0.2°, an image non - coincidence phenomenon as shown in Figure 2 b occurs; when the extension planes of the blue sheet 1 and the red sheet 2 intersect and the included angle θ is 0.1°, refer to Figure 2 c, and no image non - coincidence phenomenon occurs.

[0048] Combined with the above findings, the inventors of the present application tried to form a support member between the blue sheet 1 and the red sheet 2 by printing to ensure the parallelism of the blue sheet 1 and the red sheet 2 and avoid the problem of image non - coincidence between the blue sheet 1 and the red sheet 1. However, although the above method can solve the problem of image non - coincidence between the blue sheet 1 and the red sheet 2, it brings problems of light leakage and a decrease in the light effect and brightness uniformity of the displayed image.

[0049] The inventors of the present application analyzed the reasons for light leakage and the decrease in the light effect and brightness uniformity of the displayed image, and believed that this phenomenon is related to the shape of the support member. Please refer to Figure 3 , the shape of the support member 13' formed by printing is hemispherical, and its contact area with the first waveguide sheet 11' is relatively large. When the contact area between the first support member 13' and the first waveguide sheet 11' is relatively large, since light propagates in the light - conducting layer, when the light propagates to the contact surface between the first support member 13' and the first waveguide sheet 11', part of the light will be refracted through the first support member 13', and only part of the light will be reflected, and total internal reflection cannot occur, resulting in light leakage, that is, there are many bright spots. At the same time, some points of the image displayed by the waveguide will also have insufficient brightness, resulting in a decrease in the light effect and brightness uniformity.

[0050] Combined with the above findings, in the first aspect of the present application, a waveguide sheet module is provided. In one embodiment, please refer to Figure 4, the waveguide sheet module 100 includes a first waveguide sheet 11, a second waveguide sheet 12, a first support member 13, a first connecting member 14, a first protective layer 15, a second support member 16, and a second connecting member 17. The first waveguide sheet 11 includes a first light conduction layer 111 and a first grating structure 112 located on the surface of the first light conduction layer 111; the second waveguide sheet 12 is stacked and spaced apart on the side of the first light conduction layer 111 facing away from the first grating structure 112. The second waveguide sheet 12 includes a second light conduction layer 121 and a second grating structure 122 located on the surface of the second light conduction layer 121, and the second grating structure 122 faces the first light conduction layer 111; wherein, the first waveguide sheet has a first main body portion (not shown in the figure) and a first peripheral portion (not shown in the figure) surrounding the first main body portion, and the second waveguide sheet has a second main body portion (not shown in the figure) corresponding to the first main body portion and a second peripheral portion (not shown in the figure) corresponding to the first peripheral portion. The first support member 13 is located between the first main body portion of the first waveguide sheet 11 and the second main body portion of the second waveguide sheet 12, and includes a stacked light reflection layer 131 and a sub-support structure 132. The side of the light reflection layer 131 facing away from the sub-support structure 132 abuts against the first waveguide sheet 11, and the side of the sub-support structure 132 facing away from the light reflection layer 131 is in point contact with the second waveguide sheet 12; the first connecting member 14 is located between the first peripheral portion of the first waveguide sheet 11 and the second peripheral portion of the second waveguide sheet 12, and connects the first waveguide sheet 11 and the second waveguide sheet 12; the first protective layer 15 is stacked and spaced apart on the side of the first grating structure 112 facing away from the first light conduction layer 111; wherein, the first protective layer has a third main body portion (not shown in the figure) corresponding to the first main body portion and a third peripheral portion (not shown in the figure) corresponding to the first peripheral portion. The second support member 16 is located between the third main body portion of the first protective layer 15 and the first main body portion of the first waveguide sheet 11, and abuts against the first protective layer 15 and the first waveguide sheet 11; the second connecting member 17 is located between the third peripheral portion of the first protective layer 15 and the first peripheral portion of the first waveguide sheet 11, and connects the first protective layer 15 and the first waveguide sheet 11.

[0051] Optionally, the materials of the first waveguide sheet 11 and the second waveguide sheet 12 are both polymer materials. Compared with glass, polymer materials are lighter in weight, which helps to reduce the overall weight of the waveguide sheet module and even the AR device, and the polymer materials have better anti-drop ability. Generally speaking, the user experience of using polymer materials is better than that of using glass.

[0052] In this application, when the first waveguide sheet 11 is made of a polymer material, it means that the material of the first light conduction layer 111 is a polymer material and / or the first grating structure 112 is made of a polymer material. The material of the first light conduction layer 111 and the material of the first grating structure 112 may be the same or different. Similarly, when the second waveguide sheet 12 is made of a polymer material, it means that the material of the second light conduction layer 121 is a polymer material and / or the second grating structure 122 is made of a polymer material. The material of the second light conduction layer 121 and the material of the second grating structure 122 may be the same or different.

[0053] In this embodiment, the first grating structure 112 of the first waveguide sheet 11 and the second grating structure 122 of the second waveguide sheet 12 are arranged in the same direction, and the second grating structure 122 is located between the first light conduction layer 111 and the second light conduction layer 121. The protective layer includes a first protective layer 15, and the first protective layer 15 protects the first grating structure 112 of the first waveguide sheet 11. In another embodiment, the first grating structure 112 of the first waveguide sheet 11 and the second grating structure 122 of the second waveguide sheet 12 are arranged in the same direction, and the first grating structure 112 is located between the first light conduction layer 111 and the second light conduction layer 121. The protective layer includes a second protective layer, and the second protective layer protects the second grating structure 122 of the second waveguide sheet 12. In yet another embodiment, the first grating structure 112 of the first waveguide sheet 11 and the second grating structure 122 of the second waveguide sheet 12 are arranged in opposite directions, and both the first grating structure 112 and the second grating structure 122 are located between the first light conduction layer 111 and the second light conduction layer 121. The waveguide sheet module may omit the protective layer. In still another embodiment, the first grating structure 112 of the first waveguide sheet 11 and the second grating structure 122 of the second waveguide sheet 12 are arranged in opposite directions, and neither the first grating structure 112 nor the second grating structure is located between the first light conduction layer 111 and the second light conduction layer 121. The protective layer includes a first protective layer and a second protective layer. The first protective layer protects the first grating structure 112 of the first waveguide sheet 11, and the second protective layer protects the second grating structure 122 of the second waveguide sheet 12.

[0054] Please refer to Figure 5, in Example 1, the first waveguide sheet 11A includes a first light conduction layer 111A and a first grating structure 112A located on the surface of the first light conduction layer 111A. The first grating structure 112A includes a first coupling-in grating 1121A and a first coupling-out grating 1122A that are spaced apart. The first coupling-in grating 1121A is used to couple an optical signal into the light conduction layer 111A, and the first coupling-out grating 1122A is used to couple the optical signal transmitted through the light conduction layer 111A out of the first waveguide sheet 11A. The first coupling-in grating 1121A and the first coupling-out grating 1122A are respectively spaced apart on the same side of the light conduction layer 111A. The first coupling-in grating 1121A and the first coupling-out grating 1122A define a light propagation region I. It can be understood that the second grating structure of the second waveguide sheet corresponds to the first grating structure of the first waveguide sheet, that is, the second grating structure includes a second coupling-in grating and a second coupling-out grating that are spaced apart. The position of the second coupling-in grating corresponds to the position of the first coupling-in grating 1121A, and the position of the second coupling-out grating corresponds to the position of the first coupling-out grating 1122A. The light propagation region I defined by the first coupling-in grating 1121A and the first coupling-out grating 1122A is the light propagation region defined by the second coupling-in grating and the second coupling-out grating.

[0055] Please refer to Figure 6 , in Example 2, the first waveguide sheet 11B includes a first light conduction layer 111B and a first grating structure 112B located on the surface of the first light conduction layer 111B. The first grating structure 112B includes a first coupling-in grating 1121B, a first coupling-out grating 1122B, and a first turning grating 1123B that are spaced apart. The first turning grating 1123B is used to expand the pupil of the image information in the optical signal. The first turning grating 1123B, the first coupling-in grating 1121B, and the first coupling-out grating 1122B are respectively spaced apart on the same side of the light conduction layer 111B. The optical signal coupled into the light conduction layer 111B is first expanded by the first turning grating 1123B and then coupled out of the second waveguide sheet 11B by the first coupling-out grating 1122B. The first coupling-in grating 1121B, the first coupling-out grating 1122B, and the first turning grating 1123B define a light propagation region II. It can be understood that the second grating structure of the second waveguide sheet corresponds to the first grating structure of the first waveguide sheet, that is, the second grating structure includes a second coupling-in grating, a second coupling-out grating, and a second turning grating that are spaced apart. The position of the second coupling-in grating corresponds to the position of the first coupling-in grating 1121B, the position of the second coupling-out grating corresponds to the position of the first coupling-out grating 1122B, and the position of the second turning grating corresponds to the position of the first turning grating 1123B. The light propagation region II defined by the first coupling-in grating 1121B, the first coupling-out grating 1122B, and the first turning grating 1123B is the light propagation region defined by the second coupling-in grating, the second coupling-out grating, and the second turning grating.

[0056] In this embodiment, the first waveguide sheet 11 is a blue sheet, mainly conducting blue light and part of green light; the second waveguide sheet 12 is a red sheet, mainly conducting red light and part of green light. Through the cooperation of the first waveguide sheet 11 and the second waveguide sheet 12, a color display effect can be achieved.

[0057] To ensure the parallelism of the first waveguide sheet 11 and the second waveguide sheet 12, improve the local non-parallelism problem of the first waveguide sheet 11 and the second waveguide sheet 12, and prevent the non-coincidence of the displayed images caused by the local non-parallelism of the first waveguide sheet 11 and the second waveguide sheet 12, thereby avoiding the problem of RGB separation, a first support member 13 is provided between the main body of the first waveguide sheet 11 and the main body of the second waveguide sheet 12 in this embodiment. At the same time, the first support member 13 includes a stacked light reflection layer 131 and a sub-support structure 132. One side of the light reflection layer 131 facing away from the sub-support structure 132 abuts against the first waveguide sheet 11, and one side of the sub-support structure 132 facing away from the light reflection layer 131 is in point contact with the second waveguide sheet 12. On the one hand, please refer to Figure 7 , the light reflection layer 131 is in contact with the first waveguide sheet 11. When the light propagating in the first waveguide sheet 11 is incident on the light reflection layer 131, most of it can be reflected by the light reflection layer 131 and not refracted by the first support member 13, improving the problems of light leakage and the decline of the light effect and brightness uniformity of the displayed image; on the other hand, please refer to Figure 8 , the sub-support structure 132 is in point contact with the second waveguide sheet 12. The light refracted by the sub-support structure 132 is very few, and most of the light is reflected, which can also improve the problems of light leakage and the decline of the light effect and brightness uniformity of the displayed image.

[0058] In other embodiments, one side of the light reflection layer facing away from the sub-support structure and one side of the sub-support structure facing away from the light reflection layer respectively abut against the first waveguide sheet and the second waveguide sheet. When the light propagating in the first waveguide sheet or the second waveguide sheet is incident on the light reflection layer, most of it can be reflected by the light reflection layer and not refracted by the first support member, improving the problems of light leakage and the decline of the light effect and brightness uniformity of the displayed image.

[0059] Preferably, one side of the sub-support structure facing away from the light reflection layer is in point contact with the first waveguide sheet and the second waveguide sheet. The light refracted by the sub-support structure is very few, and most of the light is reflected, which can also improve the problems of light leakage and the decline of the light effect and brightness uniformity of the displayed image.

[0060] Optionally, the light reflection layer abuts against one side of the first light conduction layer facing away from the first grating structure, or abuts against one side of the second light conduction layer facing away from the second grating structure.

[0061] Optionally, the reflectivity R of the light reflection layer 131 for light with a wavelength of 390 nm to 780 nm satisfies: 90% ≤ R ≤ 99%.

[0062] Optionally, the light reflection layer 131 is a silver layer or an aluminum layer.

[0063] Optionally, the sub-support structure 132 has opposite bottom ends and vertex ends. The bottom end contacts the light reflection layer 131, and the vertex end contacts the second waveguide sheet 12. In this embodiment, the sub-support structure 132 is hemispherical.

[0064] Optionally, the number of the first support members 13 is multiple, and the multiple first support members 13 are distributed in an array. The multiple support members 13 distributed in an array will not have an obvious adverse effect on the display content of the waveguide sheet module 100.

[0065] Optionally, please refer to Figure 4 and Figure 9 , in one example, the multiple first support members 13 are evenly distributed between the first waveguide sheet 11 and the second waveguide sheet 12.

[0066] Optionally, along the stacking direction of the first waveguide sheet 11 and the second waveguide sheet 12, the difference Δ1 in height between any two first support members 13 satisfies: -1 μm ≤ Δ1 ≤ 1 μm. For example, Δ1 is -1 μm, -0.8 μm, -0.5 μm, -0.2 μm, 0 μm, 0.2 μm, 0.5 μm, 0.8 μm, 1 μm. And along the stacking direction of the first waveguide sheet 11 and the second waveguide sheet 12, the difference Δ2 between the thickness of the first connecting member 14 and the height of any one first support member 13 satisfies: -1 μm ≤ Δ2 ≤ 1 μm. For example, Δ2 is -1 μm, -0.8 μm, -0.5 μm, -0.2 μm, 0 μm, 0.2 μm, 0.5 μm, 0.8 μm, 1 μm. If Δ1 and Δ2 are greater than 1 μm or less than -1 μm, then the first support member 13 itself may cause local non-parallelism or the first support member 13 may not play a role in ensuring parallelism.

[0067] It can be understood that the first connecting member 14 has adhesiveness and compressibility. When the first waveguide sheet 11 and the second waveguide sheet 12 are bonded by using the first connecting member 14, the first connecting member 14 can be compressed from the coating thickness t1 to the finished product thickness t2. In this application, the thickness of the first connecting member 14 refers to the finished product thickness t2. In this embodiment, the first connecting member 14 is an optical adhesive layer (OCA layer) or a liquid optical adhesive layer (OCR layer). The finished product thickness t2 can be controlled by controlling the coating thickness t1 and the compression ratio of the first connecting member 14, so that Δ2 satisfies the above conditions, maintaining good parallelism and avoiding RGB separation.

[0068] Optionally, the connection width w1 of the first connecting member 14 satisfies: 0.5 mm ≤ w1 ≤ 1.5 mm. For example, the connection width w1 of the first connecting member 14 is: 0.5 mm, 1 mm, 1.5 mm. In this embodiment, the first connecting member 14 is located between the first peripheral portion and the second peripheral portion, connecting the first peripheral portion of the first waveguide sheet 11 and the second peripheral portion of the second waveguide sheet 12. The first connecting member 14 is annular, and the connection width w1 of the first connecting member 14 is the width of the annulus.

[0069] Optionally, the height H of each of the plurality of first support members 13 independently satisfies: 5 μm ≤ H ≤ 30 μm. For example, H is 5 μm, 8 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm. If H is too large, it is easy to visually detect these first support members 13, affecting the appearance, and at the same time blocking the user's line of sight; if H is too small, first, the printing process is extremely difficult, and second, there is currently no first connecting member 14 with a matching thickness on the market.

[0070] Optionally, along the stacking direction of the first waveguide sheet 11 and the second waveguide sheet 12, the height h1 of the light reflection layer 131 satisfies: 0.01 μm ≤ h1 ≤ 0.1 μm. For example, h1 is 0.01 μm, 0.02 μm, 0.05 μm, 0.08 μm, 0.1 μm. If h1 is too large, since the light reflection layer is generally formed by coating, the coating time becomes longer, which will cause the waveguide sheet of the polymer material to deform, exacerbating the local non-parallel problem and affecting the optical performance; if h1 is too small, the reflectivity of the light reflection layer is too low, resulting in a significant loss of light efficiency.

[0071] It can be understood that along the stacking direction of the first waveguide sheet 11 and the second waveguide sheet 12, the sum of the height h2 of the sub-support structure 132 and the height h1 of the light reflection layer 131 is the height H of the first support member 13.

[0072] Optionally, the distance D between the two farthest points in the region surrounded by the orthographic projection of the first support member 13 on the surface of the first waveguide sheet 11 satisfies: 10 μm ≤ D ≤ 200 μm. For example, D is 10 μm, 20 μm, 50 μm, 100 μm, 150 μm, 200 μm. In this embodiment, the region surrounded by the orthographic projection of the sub-support structure 132 on the surface of the first waveguide sheet 11 does not exceed the region surrounded by the orthographic projection of the light reflection layer 131 on the surface of the first waveguide sheet 11. At this time, D can be understood as the distance between the two farthest points in the region surrounded by the orthographic projection of the light reflection layer 131 on the surface of the first waveguide sheet 11. When the sub-support structure 132 is hemispherical and the light reflection layer 131 is cylindrical, and the region surrounded by the orthographic projection of the sub-support structure 132 on the surface of the first waveguide sheet 11 is the same as the region surrounded by the orthographic projection of the light reflection layer 131 on the surface of the first waveguide sheet 11, D is the diameter of the hemisphere.

[0073] Optionally, please refer to Figure 9 , the shortest distance S between any two adjacent first support members 13 satisfies: 0.5 mm ≤ S ≤ 5 mm. For example, S is 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm. If S is too small, the distribution density of the first support members 13 is too large, which will cause the transmittance of the waveguide sheet module 100 to decrease and affect the wearing visual experience; if S is too large, the distribution density of the first support members 13 is too small, which will lead to insufficient supporting force of the first support members 13, and local non-parallelism may also occur between the gaps of the first support members 13, affecting the parallelism between the first waveguide sheet and the second waveguide sheet. In this embodiment, the area enclosed by the orthographic projection of the sub-support structure 132 on the surface of the first waveguide sheet 11 does not exceed the area enclosed by the orthographic projection of the light reflection layer 131 on the surface of the first waveguide sheet 11. At this time, S can be understood as the shortest distance between any two adjacent light reflection layers 131.

[0074] Optionally, the material of the sub-support structure 132 is an inorganic non-metallic material or a polymer material. The inorganic non-metallic material is selected from glass or ceramic, and the polymer material is selected from polyamide (PA).

[0075] Optionally, the thicknesses of the first waveguide sheet 11 and the second waveguide sheet 12 are independently 0.5 mm to 1.5 mm. For example, the thickness of the first waveguide sheet 11 is 0.5 mm, 0.9 mm, 1.5 mm. The thickness of the second waveguide sheet 12 is 0.5 mm, 0.9 mm, 1.5 mm. The thicknesses of the first waveguide sheet 11 and the second waveguide sheet 12 are relatively thin, and warping deformation from the center to the periphery is likely to occur, affecting their parallelism and resulting in local non-parallelism.

[0076] The protective layer is used to protect the grating structure to be protected. The grating structure can be the first grating structure of the first waveguide sheet or the second grating structure of the second waveguide sheet. The second support member abuts against the protective layer and the waveguide sheet where the grating structure to be protected is located. The second connecting member connects the protective layer and the waveguide sheet of the grating structure to be protected.

[0077] The protective layer of this embodiment includes a first protective layer, and the first grating structure 112 of the first waveguide sheet 11 is protected by the first protective layer 15. The second grating structure 122 of the second waveguide sheet 12 is located in the enclosed space surrounded by the first waveguide sheet 11, the second light conduction layer 121, and the first connecting member 14, and is thus protected. In order to save weight, the side of the second light conduction layer 121 facing away from the second grating structure 122 is the near-eye side, and a protective layer may not be provided.

[0078] In other embodiments, the protective layer includes a second protective layer, and the second grating structure 122 of the second waveguide sheet 12 is protected by the second protective layer. The second support member 16 is located between the third main body portion of the second protective layer and the second main body portion of the second waveguide sheet, and abuts against the second protective layer and the second waveguide sheet 12; the second connecting member 17 is located between the third peripheral portion of the second protective layer and the second peripheral portion of the second waveguide sheet 12, and connects the second protective layer and the second waveguide sheet.

[0079] In other embodiments, the protective layer includes a first protective layer and a second protective layer. The first grating structure 112 of the first waveguide sheet 11 is protected by the first protective layer, and the second grating structure 122 of the second waveguide sheet 12 is protected by the second protective layer. A part of the second support member 16 is located between the third main body portion of the first protective layer and the first main body portion of the first waveguide sheet 11, and abuts against the first protective layer and the first waveguide sheet 11; a part of the second connecting member 17 is located between the third peripheral portion of the first protective layer and the first peripheral portion of the first waveguide sheet 11, and connects the first protective layer and the first waveguide sheet 11. Another part of the second support member 16 is located between the third main body portion of the second protective layer and the second main body portion of the second waveguide sheet 12, and abuts against the second protective layer and the second waveguide sheet 12; another part of the second connecting member 17 is located between the third peripheral portion of the second protective layer and the second peripheral portion of the second waveguide sheet 12, and connects the second protective layer and the second waveguide sheet.

[0080] Optionally, the material of the protective layer is a polymer material, which is beneficial to reducing the weight of the whole machine. Optionally, the thickness of the protective layer is 0.05 mm to 0.5 mm. For example, the thickness of the protective layer is 0.05 mm, 0.1 mm, 0.2 mm, 0.5 mm. The thickness of the protective layer refers to the thickness of the first protective layer or the second protective layer.

[0081] After the second connecting member 17 connects the third peripheral portion of the protective layer and the first peripheral portion of the first waveguide sheet 11 and / or the second peripheral portion of the second waveguide sheet 12, there is a gap between the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12, and the first grating structure 112 and / or the second grating structure 122 is in a completely sealed space. Since the rigidity of the protective layer is poor, when in a low-temperature environment or under external force, without the second support member 16, it is easy to have a depression, resulting in Newton's rings and adhesion phenomena. At the same time, due to the thin thickness of the protective layer, it is easy to generate warping deformation from the center to the periphery, affecting the parallelism between the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12. When the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12 are locally non-parallel, it will cause double images and ghosts. See Figure 10 .

[0082] The principle of the generation of Newton's rings is as follows: Without the second support member 16, since the protective layer is usually bonded at room temperature, when the waveguide sheet module 100 is in a low-temperature environment, due to the thermal expansion and contraction effect of the gas, the air pressure in the sealed space where the first grating structure 112 and / or the second grating structure 122 is located decreases. If the protective layer is made of a material with good rigidity such as glass or sapphire, the suspended protective layer is not easily dented. However, if the protective layer is a polymer material, due to the poor rigidity of the polymer material, the suspended protective layer is prone to dents from the periphery to the center. In addition, when there is dirt on the surface of the waveguide sheet module 100 and the surface of the waveguide sheet module 100 is wiped, if the protective layer is a polymer material, due to the poor rigidity of the polymer material, the suspended protective layer will be bent under force and dents will also occur. When the distance between the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12 is very small or they are in contact, Newton's rings and adhesion phenomena will occur between the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12. Among them, the principle of the generation of Newton's rings is as follows: When the protective layer is dented and in contact with the first waveguide sheet 11 and / or the second waveguide sheet 12, a nanoscale air film will be generated around the contact area between the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12. When ambient light is incident, some light will be directly reflected through the surface of the protective layer and / or the second waveguide sheet 12, and another part of the light will pass through the protective layer and irradiate on the first waveguide sheet 11 and / or the second waveguide sheet 12 and be reflected through the surface of the first waveguide sheet 11 and / or the second waveguide sheet 12; Since light has wave properties, when the thickness of the air film is 1 / 4 of the wavelength of light, at this time, the light reflected through the surface of the first waveguide sheet 11 and / or the second waveguide sheet 12 and the light reflected through the surface of the protective layer have a phase difference of 1 / 2 wavelength. Also, since these two beams of light are the same incident light and are coherent light, when the phase difference between these two beams of light is 1 / 2 wavelength, they will cancel each other out. In addition, since the incident ambient light is mixed light and different colors of light have different wavelengths, for example, when the thickness of the air film is 1 / 4 of the wavelength of green light, at this time, the green light part in these two beams of light in this area cancels each other out, leaving only the mixed light of the remaining visible light, showing a colored ring; Similarly, when the thickness of the air film is 1 / 4 of the wavelength of other colors of light, other colors will be shown; In summary, around the contact area, Newton's rings of respective colors will appear. The appearance of Newton's rings will seriously affect the transmittance of the waveguide sheet module 100 and cause great interference to users when using AR devices.

[0083] In this embodiment, by providing a second support member 16 between the third main body portion of the protective layer 15 and the first main body portion and / or the second main body portion of the first waveguide sheet 11 and / or the second waveguide sheet 12, when the waveguide sheet module 100 is in a low-temperature environment or subjected to an external force, due to the supporting effect of the second support member 16, the protective layer will not be sunken, thus avoiding the occurrence of Newton's rings and adhesion phenomena. At the same time, the second support member 16 can also ensure the parallelism between the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12, reducing the probability of crosstalk ghosts.

[0084] Optionally, the second support member 16 is in point contact with the first waveguide sheet 11 and / or the second waveguide sheet 12. This can improve the problems of light leakage and the decline of the light effect and brightness uniformity of the displayed image. It can be understood that the contact mode of the second support member 16 with the protective layer does not affect light leakage and the displayed image, and the second support member 16 can be in surface contact with the protective layer.

[0085] Optionally, the second support member 16 is hemispherical. One end is in point contact with the first waveguide sheet 11 and / or the second waveguide sheet 12, and the other end is in contact with the surface of the protective layer.

[0086] Optionally, the number of the second support members 16 is multiple, and the multiple second support members 16 are arranged in an array. This can improve the local non-parallelism problem between the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12, reducing the probability of crosstalk ghosts.

[0087] Optionally, along the stacking direction of the protective layer, the first waveguide sheet 11 and the second waveguide sheet 12, the height difference Δ3 between any two second support members 16 satisfies: -1μm ≤ Δ3 ≤ 1μm. For example, the height difference Δ3 between any two second support members 16 is -1μm, -0.8μm, -0.5μm, -0.2μm, 0μm, 0.2μm, 0.5μm, 0.8μm, 1μm. And the thickness difference Δ4 between the second connecting member 17 and the thickness of any second support member 16 satisfies: -1μm ≤ Δ4 ≤ 1μm. For example, the thickness difference Δ4 between the second connecting member 17 and the thickness of any second support member 16 is -1μm, -0.8μm, -0.5μm, -0.2μm, 0μm, 0.2μm, 0.5μm, 0.8μm, 1μm. If Δ3 and Δ4 are greater than 1μm or less than -1μm, then the second support member 16 itself may cause local non-parallelism or the second support member 16 may not be able to ensure parallelism.

[0088] Understandably, the second connecting member 17 has adhesiveness and compressibility. When the first waveguide sheet 11 and / or the second waveguide sheet 12 are bonded to the protective layer by using the second connecting member 17, the second connecting member 17 can be compressed, and the coating thickness t3 is compressed to the finished product thickness t4. In this application, the thickness of the second connecting member 17 refers to the finished product thickness t4. In this embodiment, the second connecting member 17 is an optical adhesive layer (OCA layer) or a liquid optical adhesive layer (OCR layer). The finished product thickness t4 can be controlled by controlling the coating thickness t3 and the compression ratio of the second connecting member 17, so that Δ4 meets the above conditions and good parallelism is maintained.

[0089] Optionally, the connection width w2 of the second connecting member 17 satisfies: 0.5 mm ≤ w2 ≤ 1.5 mm. For example, the connection width w2 of the second connecting member 17 is: 0.5 mm, 1 mm, 1.5 mm. In this embodiment, the protective layer is connected to the periphery of the first waveguide sheet 11 and / or the second waveguide sheet 12 by using the second connecting member 17. The second connecting member 17 is annular, and the connection width w2 of the second connecting member 17 is the width of the annulus.

[0090] Optionally, along the stacking direction of the protective layer, the first waveguide sheet 11 and the second waveguide sheet 12, the height h of the plurality of second support members 16 independently satisfies: 10 μm ≤ h ≤ 30 μm. For example, the height h of the second support member 16 is 10 μm, 15 μm, 20 μm, 25 μm, 30 μm. When the height h of the second support member 16 is greater than or equal to 10 μm, the thickness of the air film between the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12 is greater than or equal to 10 μm. Then, the phase difference between the light reflected by the surface of the first waveguide sheet 11 and / or the second waveguide sheet 12 and the light reflected by the surface of the protective layer exceeds 10 times the light wavelength, and the light energy of the interference is weak. At this time, it is very difficult for the naked eye to observe Newton's rings. Therefore, adopting this solution can basically solve the problem of Newton's rings; if the height h of the second support member 16 is too small, the air film thickness between the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12 is small, and there is still a risk of visible Newton's rings to the naked eye; if the height h of the second support member 16 is too large, the second support member 16 is too obvious and visible to the naked eye, which affects the wearing visual experience.

[0091] Optionally, the distance d2 between the two farthest points within the area enclosed by the orthographic projections of multiple second support members 16 on the surface of the protective layer is independently satisfied: 10 μm ≤ d2 ≤ 200 μm. For example, d2 is 10 μm, 20 μm, 50 μm, 100 μm, 150 μm, 200 μm. When the second support member 16 is hemispherical, d2 is the diameter of the hemispherical shape. When d2 is too small, insufficient support effect is generated. When the protective layer is recessed, the air film thickness between the protective layer and the first waveguide sheet 11 is small, and there is still a risk of generating Newton's rings visible to the naked eye; when d2 is too large, the second support member 16 is too obvious and visible to the naked eye, affecting the wearing visual experience.

[0092] Optionally, the shortest distance s2 between any two adjacent second support members 16 satisfies: 0.5 mm ≤ s2 ≤ 5 mm. For example, s2 is 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm. When s2 is too small, the density of the second support members 16 is too large, affecting the transmittance of the waveguide sheet module 100 and the wearing visual performance; when s2 is too large, the density of the second support members 16 is too small, the supporting force is insufficient, and there is still a risk of generating Newton's rings or local non-parallelism between the gaps of adjacent second support members 16.

[0093] In the second aspect of the present application, a method for manufacturing a waveguide sheet module is provided. In one embodiment, please refer to Figure 11 , the method for manufacturing the waveguide sheet module 100 includes the following steps:

[0094] S10. Provide a first waveguide sheet 11 and a second waveguide sheet 12. The first waveguide sheet 11 has a first main body portion and a first peripheral portion surrounding the first main body portion. The second waveguide sheet 12 has a second main body portion corresponding to the first main body portion and a second peripheral portion corresponding to the first peripheral portion.

[0095] S20. Form a light reflection layer 131 on the first main body portion or the second main body portion, and form a sub-support structure 132 on the light reflection layer 131. The light reflection layer 131 and the sub-support structure 132 form the first support member 13.

[0096] Optionally, forming the light reflection layer 131 on the first main body portion or the second main body portion includes the following steps:

[0097] S21. Provide a coating protection film. A first through hole corresponding to the position and size of the light reflection layer 131 is provided on the coating protection film. Stack the coating protection film on the first waveguide sheet 11 or the second waveguide sheet 12, and make the first through hole located on the first main body portion or the second main body portion.

[0098] Optionally, the first through holes are arranged in an array.

[0099] S22 , coating the first waveguide plate 11 or the second waveguide plate 12 stacked with the coating protective film, removing the coating protective film, and forming a light reflecting layer 131 .

[0100] Optionally, the coating method may be evaporation coating or sputtering coating.

[0101] Optionally, forming the sub-support structure 132 on the light reflecting layer 131 includes the following steps:

[0102] S23. Provide a first silk screen printing plate, on which a second through hole corresponding to the position and size of the sub-support structure 132 is provided, and the first silk screen printing plate is stacked on one side of the light reflecting layer of the first waveguide plate 11 or the second waveguide plate 12, and the second through hole is aligned with the light reflecting layer 131.

[0103] Optionally, the second through holes are distributed in an array. Optionally, the size of the second through holes of the first screen printing plate is smaller than or equal to the size of the light reflection layer 131 to prevent the subsequent glue from exceeding the light reflection layer 131 and contacting the first waveguide plate 11 or the second waveguide plate 12 .

[0104] S24 , applying glue to the first waveguide plate 11 or the second waveguide plate 12 on which the first silk-screen plate is stacked, to form a first glue droplet on the light reflecting layer 131 .

[0105] Optionally, glue may be dripped onto the first waveguide plate 11 and the second waveguide plate 12 stacked with the first silk screen plate, and then printed, so that the glue enters the second through hole of the first silk screen plate and contacts the light reflecting layer 131, and then naturally flows and leveled by gravity to form the first glue droplet.

[0106] S25 , removing the first screen printing plate and curing the first glue droplet to form a sub-support structure 132 .

[0107] The above method for forming the sub-support structure 132 is mature and suitable for industrial-scale production.

[0108] When forming the light reflection layer on the first main body, optionally, the light reflection layer is formed on the side of the first light transmission layer away from the first grating structure; when forming the light reflection layer on the second main body, optionally, the light reflection layer is formed on the side of the second light transmission layer away from the second grating structure.

[0109] In this embodiment, a light reflection layer 131 is formed on a side of the first light transmission layer of the first waveguide plate 11 away from the first grating structure, and a sub-support structure 132 is formed on the light reflection layer 131, including the following steps:

[0110] S21, providing a coating protective film, wherein the coating protective film is provided with a first through hole, the first through hole corresponds to the position and size of the light reflecting layer 131, the light reflecting layer 131 is cylindrical, and the first through hole is correspondingly cylindrical. The first through holes are distributed in an array. The coating protective film is stacked on the side of the first light conducting layer of the first waveguide plate 11 away from the first grating structure, and the first through hole is located on the first main body.

[0111] S22, coating the first waveguide plate 11 with the coating protective film stacked thereon, removing the coating protective film, and forming a light reflection layer 131. After coating, the coating protective film is separated from the first waveguide plate 11, and the light reflection layer 131 is obtained on the first main body of the first waveguide plate 11.

[0112] S23, providing a first screen printing plate, wherein the first screen printing plate is provided with a second through hole, and the second through hole corresponds to the position and size of the sub-support structure 132. The first screen printing plate is stacked on one side of the light reflecting layer 13 of the first waveguide plate 11, and the second through hole is aligned with the light reflecting layer 131. The light reflecting layer 131 is cylindrical, and the second through hole is correspondingly cylindrical, and the central axes of the two coincide. The diameter of the second through hole of the first screen printing plate is smaller than the diameter of the light reflecting layer 131, so as to prevent the subsequent glue from exceeding the light reflecting layer 131 and contacting the first waveguide plate 11.

[0113] S24 , applying glue onto the first waveguide plate 11 stacked with the first silk-screen plate, to form a hemispherical first glue droplet on the light reflecting layer 131 .

[0114] S25, separating the first screen printing plate from the first waveguide plate 11, leaving a plurality of first glue droplets arranged in an array on the first waveguide plate 11. Curing the first glue droplets to form a sub-support structure 132, and the sub-support structure 132 and the light reflecting layer 131 constitute the first support member 13.

[0115] S30, align and cover the first waveguide plate 11 and the second waveguide plate 12, so that the first support member 13 is located between the first main body and the second main body, and the side of the light reflecting layer facing away from the ion support structure and the side of the sub-support structure facing away from the light reflecting layer are respectively abutted against the first waveguide plate 11 and the second waveguide plate 12, and the first waveguide plate 11 and the second waveguide plate 12 are bonded together by using the first connecting member 14 located between the first peripheral portion and the second peripheral portion.

[0116] In this embodiment, the first waveguide plate 11 and the second waveguide plate 12 are aligned and overlapped so that the side of the light reflecting layer facing away from the ion support structure abuts against the first waveguide plate 11 and the side of the sub-support structure facing away from the light reflecting layer contacts the second waveguide plate 12 at a point.

[0117] S40, forming a second supporting member 16 on the protective layer.

[0118] Optionally, a second support member 16 is formed by printing on the protective layer. The protective layer includes a first protective layer and / or a second protective layer.

[0119] Optionally, forming the second support member 16 on the protective layer includes the following steps:

[0120] S41. Provide a second silk screen printing plate. A third through hole corresponding to the position and size of the second support member 16 is provided on the second silk screen printing plate. Stack the second silk screen printing plate on the protective layer and make the third through hole located on the third main body portion.

[0121] Optionally, the third through holes are arranged in an array.

[0122] S42. Coat glue on the protective layer stacked with the second silk screen printing plate to form second glue droplets on the protective layer.

[0123] Optionally, glue can be dropped on the protective layer stacked with the second silk screen printing plate, and the glue is scraped with a squeegee so that the glue completely fills the multiple third through holes on the second silk screen printing plate, and hemispherical second glue droplets are formed on the protective layer.

[0124] S43. Remove the second silk screen printing plate and cure the second glue droplets to form the second support member 16.

[0125] In this embodiment, the protective layer includes a first protective layer 15. Forming the second support member 16 by printing on the first protective layer 15 includes the following steps:

[0126] S41. Provide a second silk screen printing plate. Among them, the second silk screen printing plate is provided with a third through hole, the third through hole corresponds to the position and size of the second support member 16, and the third through holes are arranged in an array. Stack the second silk screen printing plate on the first protective layer 15 and make the third through hole located on the third main body portion.

[0127] S42. Coat glue on the first protective layer 15 stacked with the second silk screen printing plate, and scrape the glue with a squeegee so that the glue completely fills the multiple third through holes on the second silk screen printing plate. Hemispherical second glue droplets are formed on the first protective layer 15.

[0128] S43. Separate the second silk screen printing plate from the first protective layer 15, and leave multiple second glue droplets arranged in an array on the first protective layer 15. Cure the second glue droplets so that the second glue droplets form the second support member 16.

[0129] S50. Align and cover the first protective layer and the first waveguide sheet 11 so that the second support member 16 is located between the third main body portion and the first main body portion, abutting against the first protective layer and the first waveguide sheet 11, and bond the first protective layer and the first waveguide sheet 11 using the second connecting member 17 located between the third peripheral portion and the first peripheral portion, and / or align and cover the second protective layer and the second waveguide sheet 12 so that the second support member 16 is located between the third main body portion and the second main body portion, abutting against the second protective layer and the second waveguide sheet 12, and bond the second protective layer and the second waveguide sheet 12 using the second connecting member 17 located between the third peripheral portion and the second peripheral portion.

[0130] In this embodiment, the first protective layer 15 formed with the second support member 16 is aligned and covered with the first waveguide sheet 11, and the protective layer and the first waveguide sheet 11 are bonded using the second connecting member 17 located between the third peripheral portion and the first peripheral portion.

[0131] The local non - parallelism that is likely to occur during the bonding process of the first waveguide sheet 11 and the second waveguide sheet 12 can be improved by providing the first support member 13. The local non - parallelism that is likely to occur during the bonding process of the protective layer and the first waveguide sheet 11 and / or the second waveguide sheet 12 can be improved by providing the second support member 16.

[0132] Please refer to Figure 12 and Figure 13 , a third aspect of the present application provides an augmented reality device 200. In one embodiment, the augmented reality device 200 includes a projection optical machine 210 and the waveguide sheet module 100 as described above; the projection optical machine 210 is used to project an optical signal, and the optical signal includes image information; the waveguide sheet module 100 is disposed on the exit surface of the projection optical machine 210, and is used to transmit the optical signal and project the image information in the optical signal.

[0133] Optionally, the projection optical machine 210 includes a display 211 and a lens 213. The display 211 is used to emit an optical signal, and the lens 213 is disposed on the display surface side of the display 211 and is used to modulate the optical signal so that the light rays (optical signals) with different field - of - view angles emitted from the same pixel point on the display 211, after being modulated by the lens 213, are emitted in the form of parallel light to project the image information in the optical signal at an infinite distance so that the human eye can view it. The waveguide module 100 is disposed on the side of the lens 213 away from the display 211 and is used to transmit the optical signal modulated by the lens 213.

[0134] In this embodiment, the augmented reality device 200 further includes a carrier 220 for carrying the waveguide module 100. Optionally, the carrier 220 may be, but is not limited to, the frame of augmented reality glasses, the helmet body of an augmented reality helmet, the mask body of an augmented reality mask, etc. Optionally, the waveguide module 100 may be disposed on the carrier 220 by means of an adhesive or a fastening part, etc.

[0135] In this embodiment, the augmented reality device 200 further includes a wearing part 230. The wearing part 230 is rotatably connected to the carrier 220 and is used for clamping a wearer (such as a human head or a head prosthesis, etc.).

[0136] Optionally, the wearing part 230 includes a first wearing sub-part 231 and a second wearing sub-part 233. The first wearing sub-part 231 is rotatably connected to one end of the carrier 220, and the second wearing sub-part 233 is rotatably connected to the other end of the carrier 220 away from the first wearing sub-part 231. The first wearing sub-part 231 and the second wearing sub-part 233 cooperate to clamp the augmented reality device 200 to the wearer. Optionally, the first wearing sub-part 231 and the second wearing sub-part 233 are also used for arranging a projection optical machine. Optionally, both the first wearing sub-part 231 and the second wearing sub-part 233 may be, but are not limited to, the temple arms of the augmented reality device 200 (AR glasses).

[0137] The augmented reality device 200 of the present application may be, but is not limited to, near-eye display devices such as augmented reality glasses (AR glasses), augmented reality helmets, augmented reality masks, etc. It can be understood that the augmented reality device 200 in this embodiment is only one form of the augmented reality device 200 to which the waveguide module 100 is applied, and should not be construed as a limitation on the augmented reality device 200 provided by the present application.

[0138] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0139] The above-described embodiments only express several implementation manners of the present application, and their descriptions are relatively specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A waveguide sheet module, characterized in that, it includes: a first waveguide sheet having a first main body portion and a first peripheral portion surrounding the first main body portion; a second waveguide sheet laminated and spaced apart from the first waveguide sheet, having a second main body portion corresponding to the first main body portion and a second peripheral portion corresponding to the first peripheral portion; a first support member located between the first main body portion and the second main body portion, including a stacked light reflection layer and a sub-support structure, with one side of the light reflection layer facing away from the sub-support structure and one side of the sub-support structure facing away from the light reflection layer respectively abutting against the first waveguide sheet and the second waveguide sheet; a first connecting member located between the first peripheral portion and the second peripheral portion, connecting the first waveguide sheet and the second waveguide sheet.

2. The waveguide sheet module according to claim 1, characterized in that, the first waveguide sheet includes a first light conduction layer and a first grating structure located on the surface of the first light conduction layer, and the second waveguide layer includes a second light conduction layer and a second grating structure located on the surface of the second light conduction layer; the light reflection layer abuts against one side of the first light conduction layer facing away from the first grating structure, or abuts against one side of the second light conduction layer facing away from the second grating structure.

3. The waveguide sheet module according to claim 1, characterized in that, the reflectivity R of the light reflection layer for light with a wavelength of 390 nm to 780 nm satisfies: 90% ≤ R ≤ 99%.

4. The waveguide sheet module according to claim 3, characterized in that, the light reflection layer is a silver layer or an aluminum layer.

5. The waveguide sheet module according to claim 1, characterized in that, the sub-support structure has an opposite bottom end and vertex end, the bottom end contacts the light reflection layer, and the vertex end contacts the first waveguide sheet or the second waveguide sheet.

6. The waveguide sheet module according to claim 5, characterized in that, the sub-support structure is hemispherical.

7. The waveguide sheet module according to any one of claims 1 to 6, characterized in that, the number of the first support members is multiple, and the multiple first support members are distributed in an array.

8. The waveguide sheet module according to claim 7, characterized in that, along the lamination direction of the first waveguide sheet and the second waveguide sheet, the height of the first support member and the thickness of the first connecting member satisfy the following conditions: 1) The difference Δ1 between the heights of any two of the first support members satisfies: -1 μm ≤ Δ1 ≤ 1 μm; 2) The difference Δ2 between the thickness of the first connecting member and the height of any one of the first support members satisfies: -1 μm ≤ Δ2 ≤ 1 μm.

9. The waveguide sheet module according to claim 8, characterized in that, at least one of the following conditions is satisfied: 1) The heights H of the multiple first support members each independently satisfy: 5 μm ≤ H ≤ 30 μm; 2) Along the lamination direction of the first waveguide sheet and the second waveguide sheet, the height h1 of the light reflection layer satisfies: 0.01 μm ≤ h1 ≤ 0.1 μm.

10. The waveguide sheet module according to claim 7, characterized in that, The distance D between the two farthest points within the region enclosed by the orthographic projection of the first support member on the surface of the first waveguide sheet satisfies: 10 μm ≤ D ≤ 200 μm.

11. The waveguide sheet module according to claim 7, wherein, the shortest distance S between any two adjacent first support members satisfies: 0.5 mm ≤ S ≤ 5 mm.

12. The waveguide sheet module according to any one of claims 1 to 6, 8 to 11, wherein, the first waveguide sheet includes a first light conduction layer and a first grating structure located on the surface of the first light conduction layer, the second waveguide layer includes a second light conduction layer and a second grating structure located on the surface of the second light conduction layer, and the waveguide sheet module further includes: a protective layer, laminated and spaced apart from the first waveguide sheet and the second waveguide layer, for protecting the first grating structure and / or the second grating structure, having a third main body portion corresponding to the first main body portion and a third peripheral portion corresponding to the first peripheral portion; a second support member, located between the third main body portion and the first main body portion and / or between the third main body portion and the second main body portion, abutting against the protective layer and the waveguide sheet where the grating structure to be protected is located; a second connecting member, located between the third peripheral portion and the first peripheral portion and / or between the third peripheral portion and the second peripheral portion, connecting the protective layer and the waveguide sheet where the grating structure to be protected is located.

13. A method for manufacturing a waveguide sheet module, wherein, it includes the following steps: providing a first waveguide sheet and a second waveguide sheet, the first waveguide sheet having a first main body portion and a first peripheral portion surrounding the first main body portion, and the second waveguide sheet having a second main body portion corresponding to the first main body portion and a second peripheral portion corresponding to the first peripheral portion; forming a light reflection layer on the first main body portion or the second main body portion, and forming a sub-support structure on the light reflection layer, the light reflection layer and the sub-support structure constituting a first support member; vertically aligning and covering the first waveguide sheet and the second waveguide sheet, such that the first support member is located between the first main body portion and the second main body portion, and the side of the light reflection layer facing away from the sub-support structure and the side of the sub-support structure facing away from the light reflection layer respectively abut against the first waveguide sheet and the second waveguide sheet, and using a first connecting member located between the first peripheral portion and the second peripheral portion to bond the first waveguide sheet and the second waveguide sheet.

14. The method for manufacturing a waveguide sheet module according to claim 13, wherein, forming the light reflection layer on the first main body portion or the second main body portion includes the following steps: providing a coating protection film, on which a first through hole corresponding to the position and size of the light reflection layer is provided, stacking the coating protection film on the first waveguide sheet or the second waveguide sheet, and making the first through hole located on the first main body portion or the second main body portion; Coat the first waveguide sheet or the second waveguide sheet on which the coating protection film is stacked, and remove the coating protection film to form the light reflection layer.

15. The method for manufacturing a waveguide sheet module according to any one of claims 13 to 14, wherein, forming the sub-support structure on the light reflection layer includes the following steps: providing a first screen printing plate, on which a second through hole corresponding to the position and size of the sub-support structure is provided, stacking the first screen printing plate on one side of the light reflection layer of the first waveguide sheet or the second waveguide sheet, and aligning the second through hole with the light reflection layer; coating glue on the first waveguide sheet or the second waveguide sheet on which the first screen printing plate is stacked to form a first glue droplet on the light reflection layer; removing the first screen printing plate and curing the first glue droplet to form the sub-support structure.

16. An augmented reality device, wherein, comprising a projection optical machine and the waveguide sheet module according to any one of claims 1 to 12; the projection optical machine is configured to project an optical signal, and the optical signal includes image information; the waveguide sheet module is configured to transmit the optical signal.

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