Waveguide stack structure and manufacturing method thereof, display and vehicle

Abstract

This application provides a waveguide stacked structure and its manufacturing method, a display, and a vehicle, aiming to reduce the deformation of the transparent cover plate and the optical waveguide sheet, and improve the display effect of the waveguide stacked structure. In the waveguide stacked structure provided by this application, a first adhesive layer is located on the side of the transparent cover plate facing the first optical waveguide sheet. Multiple first supports are distributed on the first adhesive layer, located between the first adhesive layer and the first optical waveguide sheet. The first supports are in contact with the first adhesive layer, which can fix the relative position between the first supports and the transparent cover plate. Simultaneously, the first supports are also in contact with the first optical waveguide sheet. The first supports fixed between the transparent cover plate and the first optical waveguide sheet can reduce the deformation of the transparent cover plate towards the first optical waveguide sheet, and also reduce the deformation of the first optical waveguide sheet towards the transparent cover plate, thereby improving the display effect of the waveguide stacked structure.

Description

Technical Field

[0001] This application relates to the field of display device technology, specifically to a waveguide stacked structure and its fabrication method, a display, and a vehicle. Background Technology

[0002] The waveguide stack structure includes a transparent cover plate and an optical waveguide sheet stacked together. The edges of the transparent cover plate are fitted with adhesive to connect it to the edges of the optical waveguide sheet, forming a cavity. As the size of the waveguide stack structure increases (i.e., the areas of the transparent cover plate and the optical waveguide sheet increase), the area of ​​the cavity also increases. The transparent cover plate and the optical waveguide sheet are prone to deformation, which in turn affects the propagation path of the light beam within the waveguide stack structure, thus impacting its display performance. Summary of the Invention

[0003] This application provides a waveguide stacked structure and its manufacturing method, a display, and a vehicle, aiming to reduce the deformation of the transparent cover plate and the optical waveguide sheet, and improve the display effect of the waveguide stacked structure.

[0004] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0005] On one hand, embodiments of this application provide a waveguide stacked structure, including a transparent cover plate, a first optical waveguide sheet, a first adhesive layer, and a plurality of first supports: the transparent cover plate and the first optical waveguide sheet are stacked; the first adhesive layer is located on the side of the transparent cover plate facing the first optical waveguide sheet; the first supports are located between the first adhesive layer and the first optical waveguide sheet, and the plurality of first supports are distributed on the first adhesive layer, with one end of the first support away from the first optical waveguide sheet contacting the first adhesive layer, and the other end of the first support away from the transparent cover plate contacting the first optical waveguide sheet, and the first adhesive layer is used to fix the first supports.

[0006] The waveguide stacked structure provided in this application embodiment includes a transparent cover plate and a first optical waveguide sheet stacked together. The transparent cover plate not only prevents the waveguide stacked structure from being exposed in the usage scenario, thus protecting the first optical waveguide sheet, but also does not change the path of the light coupled from the first optical waveguide sheet, thus avoiding affecting the display effect of the waveguide stacked structure. A first adhesive layer is located on the side of the transparent cover plate facing the first optical waveguide sheet, and a first support is located between the first adhesive layer and the first optical waveguide sheet. The first support is in contact with the first adhesive layer, which can fix the relative position between the first support and the transparent cover plate. At the same time, the first support is also in contact with the first optical waveguide sheet. The first support fixed between the transparent cover plate and the first optical waveguide sheet can reduce the deformation of the transparent cover plate towards the first optical waveguide sheet, and also reduce the deformation of the first optical waveguide sheet towards the transparent cover plate, thereby improving the display effect of the waveguide stacked structure. Multiple first supports are distributed on the first adhesive layer, which can fix the position of each first support. During the use of the waveguide stacked structure, the displacement of the first support between the transparent cover plate and the first optical waveguide sheet can be avoided, so as to prevent the first support from scratching or damaging the first optical waveguide sheet, thereby improving the display effect of the waveguide stacked structure.

[0007] In some embodiments, the waveguide stacked structure further includes a second adhesive layer, which covers the remaining surfaces of the first support that are not in contact with the first adhesive layer. With this configuration, the second adhesive layer can prevent direct contact between the first support and the first optical waveguide sheet, and also prevent the first support from scratching or damaging the first optical waveguide sheet, thereby improving the display effect of the waveguide stacked structure.

[0008] In some embodiments, the thickness of the first adhesive layer is less than the dimension of the first support in the stacking direction, so as to avoid the first adhesive layer being too thick and affecting the propagation of light between the first optical waveguide and the transparent cover plate.

[0009] In some embodiments, the first support includes at least one of a sphere, ellipsoid, cube, cuboid, cone, frustum of a cone, pyramid, prism, and frustum of a pyramid, so that the waveguide stack structure can include a first support of various shapes, and different shapes of first supports can be selected according to different needs.

[0010] In some embodiments, the size of the first support in the stacking direction is less than 10 μm to avoid the first support being too large and affecting the propagation of light between the first optical waveguide and the transparent cover plate.

[0011] In some embodiments, the first support is an ellipsoid, with its major axis perpendicular to the stacking direction. In other embodiments, the first support is a cone, with its base surface bonded to the first optical waveguide sheet. In still other embodiments, the first support is a cuboid, with its base surface bonded to the first optical waveguide sheet. All of these designs increase the contact area between the first support and the first optical waveguide sheet, improving the support stability of the first support and making it less prone to movement.

[0012] In some embodiments, the first support is a transparent structure, and the material of the first support includes polystyrene. Polystyrene has high transparency, which can reduce the impact on light.

[0013] In some embodiments, the first adhesive layer and the second adhesive layer comprise UV-curable adhesive or optical adhesive soluble in volatile solvents.

[0014] In some embodiments, the waveguide stack structure further includes a first frame adhesive.

[0015] In some embodiments, the first adhesive layer does not cover the edge of the transparent cover plate, and the first frame adhesive is located between the transparent cover plate and the first optical waveguide sheet. The first frame adhesive directly connects the edge of the transparent cover plate and the edge of the first optical waveguide sheet; multiple first supports are located within the area surrounded by the first frame adhesive. A vacuum state exists between the transparent cover plate and the first optical waveguide sheet. The first frame adhesive creates a vacuum state between the transparent cover plate and the first optical waveguide sheet, which reduces the distance between them and decreases the thickness of the waveguide stack structure.

[0016] In other embodiments, the first adhesive layer completely covers the transparent cover plate (including the edge of the transparent cover plate), and the first frame adhesive is located between the first adhesive layer and the first optical waveguide sheet, connecting the edge of the first adhesive layer and the edge of the first optical waveguide sheet; a plurality of first supports are located within the area surrounded by the first frame adhesive. The first frame adhesive is indirectly connected to the transparent cover plate through the first adhesive layer.

[0017] In some embodiments, the waveguide stacked structure further includes a second optical waveguide sheet, which is located on the side of the first optical waveguide sheet away from the transparent cover plate and is stacked with the first optical waveguide sheet. By the above arrangement, the number of optical waveguide sheets is increased, which can improve the display effect of the waveguide stacked structure in terms of enhancing color uniformity, improving resolution and clarity, and expanding the field of view.

[0018] In some embodiments, the waveguide stacked structure further includes a third adhesive layer and a plurality of second supports. The third adhesive layer is located on the side of the first optical waveguide sheet facing the second optical waveguide sheet. The second supports are located between the third adhesive layer and the second optical waveguide sheet, and the plurality of second supports are distributed on the third adhesive layer. The third adhesive layer can fix the position of each second support, that is, the relative position between each second support fixed on the third adhesive layer and the second optical waveguide sheet is fixed. During the use of the waveguide stacked structure, displacement of the second supports between the transparent cover plate and the second optical waveguide sheet can be avoided, preventing the second supports from scratching or damaging the second optical waveguide sheet, thereby improving the display effect of the waveguide stacked structure. The end of the second support away from the second optical waveguide sheet contacts the third adhesive layer, and the end of the second support away from the second adhesive layer contacts the second optical waveguide sheet. The second supports fixed between the first and second optical waveguide sheets can reduce the deformation of the first optical waveguide sheet towards the second optical waveguide sheet, and can also reduce the deformation of the second optical waveguide sheet towards the first optical waveguide sheet, thereby improving the display effect of the waveguide stacked structure.

[0019] In some embodiments, the waveguide stack structure further includes a fourth adhesive layer, which covers the remaining surfaces of the second support that are not in contact with the third adhesive layer. With the above arrangement, the fourth adhesive layer can prevent the second support and the second optical waveguide sheet from directly contacting each other, and can also prevent the second support from scratching or damaging the second optical waveguide sheet, thereby improving the display effect of the waveguide stack structure.

[0020] In some embodiments, the thickness of the third adhesive layer is less than the dimension of the second support in the stacking direction, so as to avoid the third adhesive layer being too thick and affecting the propagation of light between the second optical waveguide sheet and the first optical waveguide sheet.

[0021] In some embodiments, the second support includes at least one of a sphere, ellipsoid, cube, cuboid, cone, frustum of a cone, pyramid, prism, and frustum of a pyramid, so that the waveguide stack structure can include a second support of various shapes, and different shapes of second supports can be selected according to different needs.

[0022] In some embodiments, the size of the second support in the stacking direction is less than 10 μm to avoid the second support being too large and affecting the propagation of light between the second optical waveguide and the transparent cover plate.

[0023] In some embodiments, the second support is an ellipsoid, with its major axis perpendicular to the stacking direction. In other embodiments, the second support is a cone, with its base surface conforming to the second optical waveguide sheet. In still other embodiments, the second support is a cuboid, with its base surface conforming to the second optical waveguide sheet. All of these designs increase the contact area between the second support and the second optical waveguide sheet, improving the support stability of the second support and making it less prone to movement.

[0024] In some embodiments, the second support is a transparent structure, and the material of the second support includes polystyrene. Polystyrene has high transparency, which can reduce the impact on light.

[0025] In some embodiments, the third and fourth adhesive layers comprise UV-curable adhesives or optical adhesives soluble in volatile solvents.

[0026] In some embodiments, the waveguide stack structure further includes a second frame adhesive.

[0027] In some embodiments, the third adhesive layer does not cover the edge of the first optical waveguide sheet, and the second frame adhesive is located between the first and second optical waveguide sheets, with the second frame adhesive branching between the edges of the first and second optical waveguide sheets; multiple first supports are located within the area enclosed by the first frame adhesive. A vacuum state exists between the first and second optical waveguide sheets, and the second frame adhesive creates this vacuum. This vacuum reduces the distance between the first and second optical waveguide sheets, thus reducing the thickness of the waveguide stack structure.

[0028] In other embodiments, the third adhesive layer completely covers the first optical waveguide sheet (including the edge of the first optical waveguide sheet), and the second frame adhesive is located between the third adhesive layer and the second optical waveguide sheet, connecting the edge of the third adhesive layer and the edge of the second optical waveguide sheet; a plurality of second supports are located within the area surrounded by the second frame adhesive. The second frame adhesive is indirectly connected to the first optical waveguide sheet through the third adhesive layer.

[0029] On the other hand, embodiments of this application also provide a display, which includes a projection device and a waveguide stack structure as described above. The first optical waveguide sheet has a coupling-in region and a coupling-out region, and the projection device is disposed opposite to the coupling-in region.

[0030] In another aspect, embodiments of this application also provide a method for fabricating a waveguide stacked structure, the method comprising:

[0031] A first solution having a first adhesive layer material is formed;

[0032] The first support is mixed with the first solution;

[0033] A first solution containing a first support is sprayed onto one side of a transparent cover plate; after the first solution cures, a first adhesive layer is formed, and multiple first supports are distributed on the first adhesive layer;

[0034] The first optical waveguide sheet is attached to the transparent cover plate.

[0035] In some embodiments, bonding the first optical waveguide sheet to the transparent cover plate includes:

[0036] A first frame adhesive is formed at the edge of the transparent cover plate;

[0037] The first optical waveguide sheet is attached to the transparent cover plate and pressed together under vacuum conditions.

[0038] In some embodiments, the manufacturing method further includes:

[0039] A second solution with a third adhesive layer material is formed;

[0040] The second support is mixed into the second solution;

[0041] The second solution, which contains the second support, is sprayed onto the side of the first optical waveguide sheet away from the glass cover plate; after the second solution cures, it forms a third adhesive layer, and multiple second supports are distributed on the third adhesive layer.

[0042] The second optical waveguide is attached to the first optical waveguide.

[0043] In some embodiments, bonding the second optical waveguide sheet and the first optical waveguide sheet includes:

[0044] A second frame adhesive is formed at the edge of the first optical waveguide sheet;

[0045] The second optical waveguide sheet is attached to the first optical waveguide sheet and pressed together under vacuum conditions.

[0046] In another aspect, embodiments of this application also provide a vehicle, which includes a cabin, seats and a display as described above, wherein both the seats and the display are disposed in the cabin and the display faces the seats.

[0047] It is understood that the beneficial effects of the waveguide stacked structure manufacturing method, display and vehicle provided in the above embodiments of this application can be referred to the beneficial effects of the waveguide stacked structure mentioned above, and will not be repeated here. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in some embodiments of this application will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this application.

[0049] Figure 1 This is a schematic diagram of the vehicle structure in an embodiment of this application;

[0050] Figure 2 This is a schematic diagram of the structure of the first or second optical waveguide sheet in the embodiments of this application;

[0051] Figure 3 This is a schematic diagram of the display structure in the embodiments of this application. Figure 1 ;

[0052] Figure 4 This is a schematic diagram of the display structure in the embodiments of this application. Figure 2 ;

[0053] Figure 5 This is a schematic diagram of the waveguide stacked structure in the embodiments of this application. Figure 1 ;

[0054] Figure 6 This is a schematic diagram of the waveguide stacked structure in the embodiments of this application. Figure 2 ;

[0055] Figure 7 This is a schematic diagram of the waveguide stacked structure in the embodiments of this application. Figure 3 ;

[0056] Figure 8 This is a schematic diagram of the waveguide stacked structure in the embodiments of this application. Figure 4 ;

[0057] Figure 9 This is a schematic diagram of the waveguide stacked structure in the embodiments of this application. Figure 5 ;

[0058] Figure 10 A schematic flowchart illustrating the fabrication method of the waveguide stacked structure provided in this application.

[0059] Explanation of reference numerals in the attached drawings: 100, vehicle; 101, seat; 200, display; 201, projection equipment; 300, waveguide stacked structure; 310, first optical waveguide sheet; 301, coupling area; 302, coupling area; 320, transparent cover plate; 330, first adhesive layer; 340, first support; 350, second adhesive layer; 360, first frame adhesive; 410, second optical waveguide sheet; 430, third adhesive layer; 440, second support; 450, fourth adhesive layer; 460, second frame adhesive. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] Hereinafter, the terms "first," "second," etc., 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, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0062] Furthermore, in the embodiments of this application, directional terms such as "up," "down," "left," "right," "horizontal," and "vertical" are defined relative to the orientation of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0063] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0064] It should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection or an integral connection; they can also refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0065] Reference Figure 1This application provides a vehicle 100, which includes a cabin, seats 101, and a display 200, wherein both the seats 101 and the display 200 are disposed within the cabin, and the display 200 is positioned facing the seats 101. Exemplarily, the vehicle 100 may include a two-seater vehicle, a five-seater vehicle, a seven-seater vehicle, etc. In some embodiments, the vehicle 100 is a two-seater vehicle, with the seats 101 including a driver's seat and a front passenger seat, and the display 200 may be disposed on the front passenger dashboard facing the front passenger seat within the cabin. In other embodiments, the vehicle 100 has two or more seats, and the display 200 may also be disposed behind the driver's seat, the front passenger seat, or other seats 101 for viewing by rear passengers.

[0066] Reference Figure 2 , Figure 3 This application provides a display 200 in the above embodiments, including a projection device 201 and a waveguide stack structure 300. The waveguide stack structure 300 includes a first optical waveguide 310, which has an insertion region 301 and an exit region 302. The projection device 201 is disposed opposite to the insertion region 301 on the first optical waveguide 310. Light from the projection device 201 is coupled into the first optical waveguide 310 from the insertion region 301, such that the light satisfies the total internal reflection condition within the first optical waveguide 310, thereby propagating within the first optical waveguide 310. The exit region 302 is used to couple the totally internally reflected light out of the first optical waveguide 310 and transmit it to the human eye to form an image.

[0067] Reference Figure 4 This application provides a waveguide stacked structure 300 in the above embodiments, which further includes a transparent cover plate 320. The transparent cover plate 320 and the first optical waveguide sheet 310 are stacked together. The transparent cover plate 320 can prevent the waveguide stacked structure 300 from being exposed in the usage scenario, thereby protecting the first optical waveguide sheet 310, and will not change the path of the light coupled from the first optical waveguide sheet 310, thus avoiding affecting the display effect of the waveguide stacked structure 300. The material of the transparent cover plate 320 may include glass, resin, etc.

[0068] Reference Figure 5In some embodiments, the waveguide stacked structure 300 further includes a first adhesive layer 330 and a plurality of first supports 340. The first adhesive layer 330 is located on the side of the transparent cover plate 320 facing the first optical waveguide sheet 310. The first supports 340 are located between the first adhesive layer 330 and the first optical waveguide sheet 310. The end of the first support 340 away from the first optical waveguide sheet 310 is in contact with the first adhesive layer 330. The first adhesive layer 330 can fix the relative position between the first support 340 and the transparent cover plate 320. At the same time, the end of the first support 340 away from the transparent cover plate 320 is in direct contact with the first optical waveguide sheet 310. The first support 340 fixed between the transparent cover plate 320 and the first optical waveguide sheet 310 can reduce the deformation of the transparent cover plate 320 towards the first optical waveguide sheet 310 and also reduce the deformation of the first optical waveguide sheet 310 towards the transparent cover plate 320, thereby improving the display effect of the waveguide stacked structure 300. Multiple first supports 340 are distributed on a plane parallel to the first adhesive layer 330. The distance between two adjacent first supports 340 can be the same or different. The first adhesive layer 330 is used to fix or bond the first supports 340 to fix the position of each first support 340. That is, the relative position between each first support 340 fixed on the first adhesive layer 330 and the first optical waveguide sheet 310 is fixed. During the use of the waveguide stacked structure 300, displacement of the first supports 340 between the transparent cover plate 320 and the first optical waveguide sheet 310 can be avoided, so as to prevent the first supports 340 from scratching or damaging the first optical waveguide sheet 310, thereby improving the display effect of the waveguide stacked structure 300.

[0069] Reference Figure 6 In the above embodiments, the waveguide stacked structure 300 further includes a second adhesive layer 350, which is located between the first support 340 and the first optical waveguide sheet 310. In some embodiments, the second adhesive layer 350 covers the surface of the first support 340 that is not in contact with the first adhesive layer 330; that is, the first adhesive layer 330 and the second adhesive layer 350 can completely enclose the entire first support 340. Through this arrangement, the second adhesive layer 350 can prevent direct contact between the first support 340 and the first optical waveguide sheet 310, and also prevent the first support 340 from scratching or damaging the first optical waveguide sheet 310, thereby improving the display effect of the waveguide stacked structure 300.

[0070] In the above embodiments, the first adhesive layer 330 and the second adhesive layer 350 can be an integral structure, integrally formed using the same adhesive. The first adhesive layer 330 and the second adhesive layer 350 are made of the same material, both including UV-curable adhesive or optical adhesive soluble in volatile solvents. During the formation of the first adhesive layer 330 and the second adhesive layer 350, the first support 340 can be mixed with a first solution containing UV-curable adhesive or optical adhesive soluble in volatile solvents, and the first solution can be sprayed onto one side of the transparent cover plate 320. In some embodiments, the UV-curable adhesive can be cured by UV light irradiation to form the first adhesive layer 330 and the second adhesive layer 350. In other embodiments, the optical adhesive soluble in volatile solvents can be cured by heating to evaporate the solvent, with the remaining optical adhesive curing to form the first adhesive layer 330 and the second adhesive layer 350.

[0071] In some embodiments, the thickness of the first adhesive layer 330 is less than the dimension of the first support 340 in the stacking direction of the transparent cover plate 320 and the first optical waveguide sheet 310, so as to avoid the first adhesive layer 330 being too thick and affecting the propagation of light between the first optical waveguide sheet 310 and the transparent cover plate 320.

[0072] In the above embodiments, the size of the first support 340 in the stacking direction is less than 10 μm, so as to avoid the first support 340 being too large and affecting the propagation of light between the first optical waveguide 310 and the transparent cover plate 320.

[0073] In some embodiments, the first support 340 may include at least one of a sphere, ellipsoid, cube, cuboid, cone, frustum of a cone, pyramid, prism, and frustum of a pyramid. In some embodiments, reference is made to... Figure 6 The first support 340 includes a sphere, the sphere having equal dimensions in all directions, which allows the multiple first supports 340 to be better distributed on a plane parallel to the first adhesive layer 330. In the above embodiment, the diameter of the first support 340 is less than 10 μm. For example, see... Figure 7 , Figure 8 , Figure 9 In an embodiment where the first support 340 is an ellipsoid, the major axis of the ellipsoid is perpendicular to the stacking direction. In an embodiment where the first support 340 is a cone, the base of the cone is in contact with the first optical waveguide sheet 310. In an embodiment where the first support 340 is a cuboid, the base of the cuboid is in contact with the first optical waveguide sheet 310. This increases the contact area between the first support 340 and the first optical waveguide sheet 310, improves the support stability of the first support 340, and makes the first support 340 less prone to movement.

[0074] In the above embodiments, the first support 340 is a transparent structure, and the material of the first support 340 may include polystyrene. Polystyrene has high transparency, which can reduce the impact on light.

[0075] In the above embodiments, the first adhesive layer 330 may completely cover the transparent cover plate 320, or may not completely cover the transparent cover plate 320 (for example, the first adhesive layer 330 may only be located in the middle area of ​​the transparent cover plate 320 and may not cover the edge of the transparent cover plate 320).

[0076] The waveguide stacked structure 300 also includes a first frame adhesive 360, as shown in the reference. Figure 5 In an embodiment where the first adhesive layer 330 does not cover the edge of the transparent cover plate 320, the first frame adhesive 360 ​​is located between the transparent cover plate 320 and the first optical waveguide sheet 310, and the first frame adhesive 360 ​​directly connects the edges of the transparent cover plate 320 and the edges of the first optical waveguide sheet 310. (Refer to...) Figure 6 In the embodiment where the first adhesive layer 330 completely covers the transparent cover plate 320, the first frame adhesive 360 ​​is located between the first adhesive layer 330 and the first optical waveguide sheet 310. The first frame adhesive 360 ​​connects the edge of the first adhesive layer 330 and the edge of the first optical waveguide sheet 310. The first frame adhesive 360 ​​is indirectly connected to the transparent cover plate 320 through the first adhesive layer 330.

[0077] In both of the above embodiments, multiple first supports 340 are located within the area surrounded by the first frame adhesive 360. The first frame adhesive 360 ​​can be formed by UV curing adhesive and is used to bond the transparent cover plate 320 and the first optical waveguide sheet 310 under vacuum. The first frame adhesive 360 ​​creates a vacuum between the transparent cover plate 320 and the first optical waveguide sheet 310. The vacuum inside can reduce the distance between the transparent cover plate 320 and the first optical waveguide sheet 310, thereby reducing the thickness of the waveguide stacked structure 300.

[0078] In some embodiments, the waveguide stacked structure 300 further includes a second optical waveguide sheet 410, which is located on the side of the first optical waveguide sheet 310 facing away from the transparent cover plate 320. The second optical waveguide sheet 410 and the first optical waveguide sheet 310 are stacked together. This arrangement increases the number of optical waveguide sheets, which can improve the display effect of the waveguide stacked structure 300 in terms of enhancing color uniformity, improving resolution and clarity, and expanding the field of view. In the above embodiments, the structure of the second optical waveguide sheet 410 is the same as that of the first optical waveguide sheet 310. The second optical waveguide sheet 410 also has a coupling-in region 301 and a coupling-out region 302. For example, the coupling-in region 301 on the second optical waveguide sheet 410 is correspondingly arranged with the coupling-in region 301 on the first optical waveguide sheet 310, and the coupling-out region 302 on the second optical waveguide sheet 410 is correspondingly arranged with the coupling-out region 302 on the first optical waveguide sheet 310.

[0079] Reference Figure 5 In some embodiments, the waveguide stack structure 300 further includes a third adhesive layer 430 and a plurality of second supports 440. The third adhesive layer 430 is located on the side of the first optical waveguide sheet 310 facing the second optical waveguide sheet 410. The second supports 440 are located between the third adhesive layer 430 and the second optical waveguide sheet 410. The end of the second support 440 away from the second optical waveguide sheet 410 contacts the third adhesive layer 430, which can fix the relative position between the second support 440 and the first optical waveguide sheet 310. Simultaneously, the end of the second support 440 away from the first optical waveguide sheet 310 directly contacts the second optical waveguide sheet 410, fixing it to the first and second optical waveguide sheets 310. The second support 440 between the optical waveguide sheets 410 can reduce the deformation of the first optical waveguide sheet 310 towards the second optical waveguide sheet 410, and also reduce the deformation of the second optical waveguide sheet 410 towards the first optical waveguide sheet 310, thereby improving the display effect of the waveguide stacked structure 300. Multiple second supports 440 are distributed on a plane parallel to the third adhesive layer 430. The distance between adjacent second supports 440 can be the same or different. The third adhesive layer 430 can fix the position of each second support 440; that is, the relative position between each second support 440 fixed on the third adhesive layer 430 and the second optical waveguide sheet 410 is fixed. During the use of the waveguide stacked structure 300, displacement of the second supports 440 between the transparent cover plate 320 and the second optical waveguide sheet 410 can be avoided, preventing the second supports 440 from scratching or damaging the second optical waveguide sheet 410, thereby improving the display effect of the waveguide stacked structure 300.

[0080] Reference Figure 6 In the above embodiments, the waveguide stacked structure 300 further includes a fourth adhesive layer 450, the structure of which is the same as that of the second adhesive layer 350. The fourth adhesive layer 450 is located between the second support 440 and the second optical waveguide sheet 410. In some embodiments, the fourth adhesive layer 450 covers the surface of the second support 440 that is not in contact with the third adhesive layer 430, that is, the third adhesive layer 430 and the fourth adhesive layer 450 can completely cover the entire second support 440. Through the above arrangement, the fourth adhesive layer 450 can prevent the second support 440 and the second optical waveguide sheet 410 from directly contacting each other, and can also prevent the second support 440 from scratching or damaging the second optical waveguide sheet 410, thereby improving the display effect of the waveguide stacked structure 300.

[0081] In the above embodiments, the third adhesive layer 430 and the fourth adhesive layer 450 can be an integral structure, integrally molded using the same adhesive. The materials of the third adhesive layer 430 and the fourth adhesive layer 450 are the same, both including UV-curable adhesive or optical adhesive soluble in volatile solvents. During the formation of the third adhesive layer 430 and the fourth adhesive layer 450, the second support 440 can be mixed with a second solution containing UV-curable adhesive or optical adhesive soluble in volatile solvents, and the second solution can be sprayed onto the side of the first optical waveguide sheet 310 facing away from the transparent cover plate 320. In some embodiments, the UV-curable adhesive can be cured by UV light irradiation to form the third adhesive layer 430 and the fourth adhesive layer 450. In other embodiments, the optical adhesive soluble in volatile solvents can be cured by heating to evaporate the solvent, with the remaining optical adhesive curing to form the third adhesive layer 430 and the fourth adhesive layer 450.

[0082] In some embodiments, the thickness of the third adhesive layer 430 is less than the dimension of the second support 440 in the stacking direction of the first optical waveguide 310 and the second optical waveguide 410, so as to avoid the third adhesive layer 430 being too thick and affecting the propagation of light between the second optical waveguide 410 and the first optical waveguide 310.

[0083] In the above embodiments, the size of the second support 440 in the stacking direction is less than 10 μm, so as to avoid the second support 440 being too large and affecting the propagation of light between the second optical waveguide 410 and the first optical waveguide 310.

[0084] In some embodiments, the second support 440 may include at least one of a sphere, ellipsoid, cube, cuboid, cone, frustum of a cone, pyramid, prism, and frustum of a pyramid. In some embodiments, reference is made to... Figure 6 The second support 440 includes a sphere, the sphere having equal dimensions in all directions, which allows multiple second supports 440 to be better distributed on a plane parallel to the third adhesive layer 430. In the above embodiment, the diameter of the second support 440 is less than 10 μm. For example, see... Figure 7 , Figure 8 , Figure 9 In an embodiment where the second support 440 is an ellipsoid, the major axis of the ellipsoid is perpendicular to the stacking direction. In an embodiment where the second support 440 is a cone, the bottom surface of the cone is in contact with the second optical waveguide sheet 410. In an embodiment where the second support 440 is a cuboid, the bottom surface of the cuboid is in contact with the second optical waveguide sheet 410. This increases the contact area between the second support 440 and the second optical waveguide sheet 410, improves the support stability of the second support 440, and makes the second support 440 less prone to movement.

[0085] In the above embodiments, the second support 440 is a transparent structure, and the material of the second support 440 may include polystyrene. Polystyrene has high transparency, which can reduce the impact on light.

[0086] In the above embodiments, the third adhesive layer 430 may completely cover the first optical waveguide 310, or may not completely cover the first optical waveguide 310 (for example, the third adhesive layer 430 may only be located in the middle region of the first optical waveguide 310 and may not cover the edges of the first optical waveguide 310).

[0087] The waveguide stack structure 300 also includes a second frame adhesive 460, as shown in the reference. Figure 5 In an embodiment where the third adhesive layer 430 does not cover the edge of the first optical waveguide sheet 310, the second frame adhesive 460 is located between the first optical waveguide sheet 310 and the second optical waveguide sheet 410, and the second frame adhesive 460 directly connects the edges of the first optical waveguide sheet 310 and the edges of the second optical waveguide sheet 410. (Refer to...) Figure 6 In an embodiment where the second frame adhesive 460 completely covers the first optical waveguide sheet 310, the second frame adhesive 460 is located between the third adhesive layer 430 and the second optical waveguide sheet 410. The second frame adhesive 460 connects the edge of the third adhesive layer 430 and the edge of the second optical waveguide sheet 410. The second frame adhesive 460 is indirectly connected to the first optical waveguide sheet 310 through the third adhesive layer 430.

[0088] In both of the above embodiments, multiple second supports 440 are located within the area surrounded by the second frame adhesive 460; the second frame adhesive 460 can be formed by UV curing adhesive, and the first optical waveguide sheet 310 and the second optical waveguide sheet 410 are bonded together in a vacuum state. The second frame adhesive 460 creates a vacuum state between the first optical waveguide sheet 310 and the second optical waveguide sheet 410. The vacuum interior can reduce the distance between the first optical waveguide sheet 310 and the second optical waveguide sheet 410, thereby reducing the thickness of the waveguide stack structure 300.

[0089] The above implementation includes a first optical waveguide 310 and a second optical waveguide 410. It is understood that the waveguide stacked structure provided in this application may also include multiple optical waveguides. Two optical waveguides can be connected through the structure between the first optical waveguide 310 and the second optical waveguide 410. This application does not limit the number of optical waveguides.

[0090] This application also provides a method for fabricating a waveguide stacked structure, used to fabricate the aforementioned waveguide stacked structure 300. (Refer to...) Figure 10 The fabrication methods for waveguide stacked structures can include S100-S400.

[0091] S100: Form a first solution having a first adhesive layer material.

[0092] In S100, the material of the first adhesive layer 330 may include a UV-curable adhesive or an optical adhesive soluble in a volatile solvent.

[0093] S200: Mix the first support into the first solution.

[0094] S300: A first solution mixed with a first support is sprayed onto one side of a transparent cover plate; after the first solution cures, a first adhesive layer is formed, and multiple first supports are distributed on the first adhesive layer.

[0095] In S300, a portion of the first solution comes into contact with the transparent cover plate 320 and cures to form a first adhesive layer 330; simultaneously, a portion of the first solution coats the first support 340 and cures to form a second adhesive layer 350. When the material in the first solution is a UV-curable adhesive, it can be cured by UV irradiation to form the first adhesive layer 330 and the second adhesive layer 350. When the material in the first solution is an optical adhesive soluble in a volatile solvent, the solvent can be evaporated by heating, and the remaining optical adhesive can cure to form the first adhesive layer 330 and the second adhesive layer 350.

[0096] S400: The first optical waveguide sheet is attached to the transparent cover plate.

[0097] In S400, the first optical waveguide sheet 310 is bonded to the transparent cover plate 320, so that the first support body 340 is located between the first adhesive layer 330 and the first optical waveguide sheet 310. One end of the first support body 340 is in contact with the first adhesive layer 330, and the other end is in contact with the first optical waveguide sheet 310.

[0098] S400 also includes forming a first frame adhesive 360 ​​at the edge of the transparent cover plate 320. After the first adhesive layer 330 is cured, a 2mm wide UV-curable adhesive is applied to the edge of the transparent cover plate 320, and the first optical waveguide sheet 310 is attached to the transparent cover plate 320 and pressed together under vacuum (-60KPa). Then, after the vacuum is released, the UV-curable adhesive is cured to form the first frame adhesive 360. The formed first frame adhesive 360 ​​connects the edge of the transparent cover plate 320 and the edge of the first optical waveguide sheet 310.

[0099] Based on this, the fabrication method of this waveguide stacked structure may also include:

[0100] A second solution is formed having a third adhesive layer 430 material. The third adhesive layer 430 material may include a UV-curable adhesive or an optical adhesive soluble in a volatile solvent.

[0101] The second support 440 is mixed in the second solution.

[0102] The second solution, which contains the second support, is sprayed onto one side of the first optical waveguide 310; after the second solution is cured, a third adhesive layer 430 is formed, and a plurality of second supports 440 are distributed on the third adhesive layer 430.

[0103] In this process, a portion of the second solution contacts the first optical waveguide 310 and cures to form a third adhesive layer 430; simultaneously, a portion of the second solution coats the second support 440 and cures to form a fourth adhesive layer 450. When the material in the second solution is a UV-curable adhesive, it can be cured by UV irradiation to form the third adhesive layer 430 and the fourth adhesive layer 450. When the material in the second solution is an optical adhesive soluble in a volatile solvent, the solvent can be evaporated by heating, and the remaining optical adhesive can cure to form the third adhesive layer 430 and the fourth adhesive layer 450.

[0104] Then, the second optical waveguide sheet 410 is attached to the first optical waveguide sheet 310, so that the second support 440 is located between the third adhesive layer 430 and the second optical waveguide sheet, with one end of the second support in contact with the third adhesive layer and the other end in contact with the second optical waveguide sheet.

[0105] The fabrication method of this waveguide stacked structure further includes forming a second frame adhesive 460 at the edge of the first optical waveguide sheet. After curing to form a third adhesive layer 430, a 2mm wide UV-curable adhesive is applied to the edge of the first optical waveguide sheet. Under vacuum (-60KPa), the second optical waveguide sheet 410 is attached to the first optical waveguide sheet 310 and pressed together. Then, after the vacuum is released, the UV-curable adhesive is cured to form the second frame adhesive 460. The formed second frame adhesive 460 connects the edges of the first optical waveguide sheet 310 and the edges of the second optical waveguide sheet 410.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A waveguide stack structure, characterized by, include: A transparent cover plate and a first optical waveguide sheet are stacked together; The first adhesive layer is located on the side of the transparent cover plate facing the first optical waveguide sheet; Multiple first supports are distributed on the first adhesive layer. The end of each first support away from the first optical waveguide sheet is in contact with the first adhesive layer, and the end of each first support away from the transparent cover plate is in contact with the first optical waveguide sheet. The first adhesive layer is used to fix the first supports.

2. The waveguide stack structure of claim 1, wherein, The waveguide stacked structure further includes a second adhesive layer, which covers the surface of the first support that is not in contact with the first adhesive layer.

3. The waveguide stack structure of claim 2, wherein, The first adhesive layer and the second adhesive layer are made of the same material.

4. The waveguide stack structure of any one of claims 1-3, wherein, The thickness of the first adhesive layer is less than the dimension of the first support in the stacking direction.

5. The waveguide stack structure of any one of claims 1-4, wherein, The first support includes at least one of a sphere, an ellipsoid, a cube, a cuboid, a cone, a frustum of a cone, a pyramid, a prism, and a frustum of a pyramid.

6. The waveguide stack structure of any one of claims 1-5, wherein, The first support has a dimension of less than 10 μm in the stacking direction.

7. The waveguide stack structure of any one of claims 1-6, wherein, The first support is an ellipsoid, with its major axis perpendicular to the stacking direction; Alternatively, the first support body is a cone, and the bottom surface of the cone is attached to the first optical waveguide sheet; Alternatively, the first support body is a cuboid, and the bottom surface of the cuboid is attached to the first optical waveguide sheet.

8. The waveguide stacked structure according to any one of claims 1 to 7, characterized in that, The first support is a transparent structure.

9. The waveguide stack structure of any one of claims 1-8, wherein, The waveguide stacked structure further includes a first frame adhesive, which is located between the transparent cover plate and the first optical waveguide sheet. The first frame adhesive connects the edge of the transparent cover plate and the edge of the first optical waveguide sheet. A plurality of first supports are located within the area surrounded by the first frame adhesive.

10. The waveguide stack structure of any one of claims 1-8, wherein, The waveguide stacked structure further includes a first frame adhesive, which is located between the first adhesive layer and the first optical waveguide sheet, and the first frame adhesive connects the edge of the first adhesive layer and the edge of the first optical waveguide sheet; a plurality of first supports are located within the area surrounded by the first frame adhesive.

11. The waveguide stack structure of any one of claims 1-10, wherein, The waveguide stacked structure further includes a second optical waveguide sheet, a third adhesive layer, and a plurality of second supports. The second optical waveguide sheet is located on the side of the first optical waveguide sheet away from the transparent cover plate and is stacked with the first optical waveguide sheet. The third adhesive layer is located on the side of the first optical waveguide sheet facing the second optical waveguide sheet. The second supports are located between the third adhesive layer and the second optical waveguide sheet. A plurality of second supports are distributed on the third adhesive layer. The end of the second support away from the second optical waveguide sheet is in contact with the third adhesive layer, and the end of the second support away from the second adhesive layer is in contact with the second optical waveguide sheet. The third adhesive layer is used to fix the first supports.

12. The waveguide stack structure of claim 11, wherein, The waveguide stack structure further includes a fourth adhesive layer, which covers the surface of the second support that is not in contact with the third adhesive layer.

13. The waveguide stack structure of claim 12, wherein, The third adhesive layer and the fourth adhesive layer are made of the same material.

14. The waveguide stack structure of any one of claims 11-13, wherein, The thickness of the third adhesive layer is less than the dimension of the second support in the stacking direction.

15. The waveguide stack structure of any one of claims 11-14, wherein, The second support includes at least one of a sphere, ellipsoid, cube, cuboid, cone, frustum of a cone, pyramid, prism, and frustum of a pyramid.

16. The waveguide stack structure of any one of claims 11-15, wherein, The second support has a dimension of less than 10 μm in the stacking direction.

17. The waveguide stack structure of any one of claims 11-16, wherein, The second support is an ellipsoid, with its major axis perpendicular to the stacking direction; Alternatively, the second support body is a cone, and the bottom surface of the cone is attached to the second optical waveguide sheet; Alternatively, the second support is a cuboid, with the bottom surface of the cuboid attached to the second optical waveguide sheet.

18. The waveguide stacked structure according to any one of claims 11 to 17, characterized in that, The second support is a transparent structure.

19. The waveguide stack structure of any one of claims 11-18, wherein, The waveguide stacked structure further includes a second frame adhesive, which is located between the first optical waveguide sheet and the second optical waveguide sheet, and the second frame adhesive connects the edge of the first optical waveguide sheet and the edge of the second optical waveguide sheet; a plurality of second supports are located within the area surrounded by the second frame adhesive.

20. The waveguide stack structure of any one of claims 11-18, wherein, The waveguide stack structure further includes a second frame adhesive, which is located between the third adhesive layer and the second optical waveguide sheet. The second frame adhesive connects the edge of the third adhesive layer and the edge of the second optical waveguide sheet. A plurality of second supports are located within the area surrounded by the second frame adhesive.

21. A method of fabricating a waveguide stack structure, comprising: include: A first solution having a first adhesive layer material is formed; The first support is mixed into the first solution; The first solution, mixed with the first support, is sprayed onto one side of the transparent cover plate; After the first solution solidifies, it forms a first adhesive layer, and a plurality of the first supports are distributed on the first adhesive layer; The first optical waveguide sheet is attached to the transparent cover plate.

22. The method of manufacturing according to claim 21, wherein, The bonding of the first optical waveguide sheet and the transparent cover plate includes: A first frame adhesive is formed at the edge of the transparent cover plate; The first optical waveguide sheet is attached to the transparent cover plate and pressed together under vacuum.

23. The method of manufacturing of claim 21, wherein, The manufacturing method further includes: A second solution with a third adhesive layer material is formed; The second support is mixed into the second solution; The second solution, which contains the second support, is sprayed onto the side of the first optical waveguide sheet away from the glass cover plate; after the second solution cures, it forms a third adhesive layer, and a plurality of the second supports are distributed on the third adhesive layer; The second optical waveguide is attached to the first optical waveguide.

24. The method of manufacturing according to claim 23, wherein, The bonding of the second optical waveguide sheet and the first optical waveguide sheet includes: A second frame adhesive is formed at the edge of the first optical waveguide sheet; The second optical waveguide sheet is attached to the first optical waveguide sheet and pressed together under vacuum conditions.

25. A display, comprising: The display includes a projection device and a waveguide stack structure as described in any one of claims 1-20, wherein the first optical waveguide sheet has a coupling-in region and a coupling-out region, and the projection device is disposed opposite to the coupling-in region.

26. A vehicle characterized by The vehicle includes a cabin, seats, and a display as described in claim 25, wherein both the seats and the display are disposed within the cabin, and the display is disposed facing the seats.

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