Display lens

Abstract

We provide display lenses. [Solution] A support structure (210) is provided on at least one opposing surface between the protective sheet (110) and the waveguide sheets (30, 130). The surface of the support structure (210) is an uneven surface, and different support structures (210) are provided at different positions. Furthermore, by limiting the position of the support structure (210), when deformation occurs due to pressure or the like on the protective sheet (110) and / or waveguide sheets (30, 130), the contact method between the protective sheet (110) and the waveguide sheets (30, 130) or between the waveguide sheets (30, 130) is changed, thereby reducing the occurrence of Newton's rings and improving the display effect of existing lenses. By limiting the position and structure of the support structure (210), the contact method between the protective sheet (110) and the waveguide sheets (30, 130) can be changed from different angles, improving the display performance of the display lens, simultaneously improving the deformation resistance capability of the display lens, and improving the overall strength of the display lens.

Description

[Technical Field]

[0001] The present application relates to the technical field of augmented reality technology, and in particular, to a display lens. [Background Art]

[0002] With the development of related technologies such as AR and VR in the existing related arts of optical waveguides, smart glasses have gradually become popular in daily life. In order to improve the color display effect and achieve light weight and thinning of the device, the waveguide assembly is usually thinned, or lighter and thinner materials are selected as substitutes. However, due to the light weight, thinness and flexibility of this type of material itself, it is difficult to achieve pressure resistance, and while achieving weight reduction, new problems are brought to the waveguide assembly. For example, the overall strength or rigidity of the waveguide assembly is low, and bending deformation is prone to occur during use. In particular, large-area contact and adhesion between sheets of the waveguide assembly is prone to occur due to pressure or collision during use, resulting in the Newton's ring phenomenon, the waveguide assembly is difficult to recover to its original state, which further affects the display effect of the diffractive optical waveguide. How to avoid the occurrence of this phenomenon has become a technical problem in the industry.

[0003] In order to solve the above technical problem, the present invention provides a display lens that reduces the occurrence of Newton's rings in a waveguide. [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] The present application provides a display lens and a method for manufacturing the display lens, which improves the deformation condition of a protective sheet when it is subjected to pressure, avoids large-area contact between the waveguide sheet and the protective sheet, is more favorable for deformation recovery, avoids the Newton's ring phenomenon by changing the contact form between the existing grating region and the protective sheet, and simultaneously improves the overall strength of the display lens.

[0005] A display lens comprising at least one waveguide sheet and at least one protective sheet, wherein the waveguide sheet and the protective sheet are arranged in a laminated manner, a grid structure is provided on one surface of the waveguide sheet facing the protective sheet, the grid structure includes an incident coupling grid and an exit coupling grid, a support structure is provided on at least one opposing surface between the protective sheet and the waveguide sheet, the surface of the support structure is a non-smooth surface, and the support structure is configured so as not to affect the optical path of the waveguide sheet.

[0006] Furthermore, a support structure is provided on one side surface of the protective sheet facing the grid structure, the support structure is provided at least within the orthographic projection region of the grid structure on the protective sheet, the surface of the waveguide sheet of the support structure is a non-smooth surface, and the support structure is configured so as not to affect the optical path of the waveguide sheet.

[0007] The support structure is provided within the orthographic projection region on the protective sheet of the grid structure and extends beyond the orthographic projection region.

[0008] The support structure includes a curing adhesive and fine particles filled within the curing adhesive, wherein the particle size of the fine particles is greater than the height of the cured layer formed after the curing adhesive has cured, and the support structure includes a plurality of support units.

[0009] In one embodiment, the waveguide sheets and protective sheets are arranged in a laminated manner, with a grid structure provided on one side surface of each layer of waveguide sheets, the support structure provided on one side surface of the protective sheet facing the grid structure, and the support structure provided on one side surface of an intermediate waveguide sheet facing the other waveguide sheet, and the support structure is provided at least within the orthographic projection region of the grid structure of the waveguide sheets in the protective sheet.

[0010] A display lens comprising at least one waveguide sheet and at least one protective sheet, wherein the waveguide sheet and the protective sheet are laminated, a grid structure is provided on one surface of the waveguide sheet facing the protective sheet, the grid structure includes an incident coupling grid and an outgoing coupling grid, a grid structure region is formed in the region where the incident coupling grid and the outgoing coupling grid are located and connected regions, a first support structure is provided on one surface of the waveguide sheet facing the protective sheet, a second support structure is provided on one surface of the protective sheet facing the waveguide sheet, the first support structure surrounds the grid structure region, and the first support structure on the waveguide sheet surface and the second support structure on the protective sheet surface are in contact with each other.

[0011] The first support structure and the second support structure have orthographic projections on the protective sheet or waveguide sheet that overlap each other.

[0012] The first support structure and the second support structure include a plurality of support units.

[0013] The heights of the first support structure on the waveguide sheet surface and the second support structure on the protective sheet surface are different, and / or the widths of the first support structure on the waveguide sheet surface and the second support structure on the protective sheet surface are different. The cross-sections of the first support structure and the second support structure are annular and / or point-shaped.

[0014] The tooth width of the multiple support units is greater than 10 times the tooth width of each grid unit.

[0015] The tooth width of each support unit in the plurality of support units is 2 μm to 150 μm. Furthermore, the tooth width of each support unit is limited to 50 μm to 120 μm. The height of each support unit is 1 μm to 0.2 mm.

[0016] Furthermore, the structure includes at least two waveguide sheets and at least one protective sheet, with a grid structure provided on one side surface of each waveguide sheet facing the protective sheet, the first support structure provided outside the grid structure region on each waveguide sheet, and the second support structure provided on one side surface of the intermediate waveguide sheet facing the other waveguide sheet, the first support structure and the second support structure each include a plurality of support units, the plurality of support units of the first support structure and the plurality of support units of the second support structure are in contact with each other, and the plurality of support units of the first support structure surround the grid structure region.

[0017] A display device including a display lens as described in any one of the above embodiments.

[0018] In another embodiment, the projected light ray of the optical instrument is incident on the incident coupled grating, undergoes total internal reflection within the waveguide sheet, and exits from the exit coupled grating. A grating structure region is formed in the region where the incident coupled grating and the exit coupled grating are located and connected to each other. A support structure is provided outside the grating structure region, and the support structure surrounds the grating structure region. The cross-section of the support structure is annular and / or point-shaped, and the support structure is configured so as not to affect the optical path of the waveguide sheet.

[0019] In another embodiment, a first magnetic coating layer is provided on the surface of the protective sheet facing one side of the waveguide sheet, and a second magnetic coating layer is provided on the surface of the waveguide sheet facing one side of the protective sheet, the projections of the first magnetic coating layer and the second magnetic coating layer overlap at least partially, the first magnetic coating layer is provided within the orthographic projection region of the protective sheet of the lattice structure and extends outside the orthographic projection region, and the magnetism of the first magnetic coating layer and the magnetism of the second magnetic coating layer are different.

[0020] The first magnetic coating layer and the second magnetic coating layer are divided into multiple regions.

[0021] The refractive indices of the first and second magnetic coating layers located within the orthographic region are 2 or greater, and are greater than or equal to the refractive index of the lattice structure. The refractive indices of the first and second magnetic coating layers located outside the orthographic region are between 1.0 and 1.5, and are configured so as not to affect the propagation of light rays in the optical path.

[0022] The particle size of the fine particles in the first magnetic coating layer and the second magnetic coating layer is configured to be smaller than the spacing between teeth in the lattice structure.

[0023] The second magnetic coating layer is configured to surround the lattice structure, or to cover the lattice structure.

[0024] The thickness of the first magnetic coating layer is less than the thickness of the second magnetic coating layer. The first magnetic coating layer material and the second magnetic coating layer material are translucent magnetic coating layer materials.

[0025] The first magnetic coating layer partially or entirely covers the surface of the protective sheet facing the waveguide sheet. The particle size of the fine particles may be 3 nm to 300 nm.

[0026] The thickness of the second magnetic coating layer material is greater than the height of the incident coupling grid and the exit coupling grid, and less than the height of the connecting member.

[0027] In one embodiment, the display lens comprises at least two layers of waveguide sheets and at least one layer of protective sheet, wherein the waveguide sheets and the protective sheet are arranged in a stacked manner; a first magnetic coating layer is provided on a surface of the protective sheet facing one side of the waveguide sheet, a second magnetic coating layer is provided on a surface of the waveguide sheet facing one side of the protective sheet, a first magnetic coating layer is provided on a side surface of the intermediate waveguide sheet facing the other waveguide sheet, projections of the first magnetic coating layer and the second magnetic coating layer at least partially overlap, and magnetism of the first magnetic coating layer is different from magnetism of the second magnetic coating layer.

[0028] A method for manufacturing a display lens, wherein the display lens comprises at least one layer of waveguide sheet and at least one layer of protective sheet, and the waveguide sheet and the protective sheet are arranged in a stacked manner, the method comprising the following steps:

[0029] S1: providing a grating structure on a surface of the waveguide sheet facing the protective sheet, wherein the grating structure comprises an incident coupling grating and an exit coupling grating.

[0030] S2: providing a support structure on a side surface of the protective sheet facing the grating structure, wherein the support structure is provided at least in an orthographic projection region of the grating structure on the protective sheet, and a surface of the support structure adjacent to the waveguide sheet is a non-smooth surface.

[0031] S3: connecting the waveguide sheet and the protective sheet via a connecting member.

[0032] In step S2, providing the support structure on the side surface of the protective sheet facing the grating structure specifically comprises forming the support structure on the protective sheet by molding, printing, etching, nanoimprinting or inkjet printing technology; the support structure comprises a plurality of support units, and a tooth width of the support unit is more than 10 times a tooth width of each grating unit.

[0033] This application provides a display lens and a method for manufacturing a display lens, wherein a support structure is provided on at least one opposing surface between the protective sheet and the waveguide sheet, the surface of the support structure is a non-smooth surface, and further by limiting the plurality of embodiments, the support structure is provided on one side surface of the protective sheet facing the grid structure, the support structure is provided at least within the orthographic projection region of the grid structure on the protective sheet, or the support structure surrounds the grid structure region and different support structures are provided at different positions, and the structure of the support structure is limited to the position, so that when deformation occurs in the protective sheet and / or waveguide sheet due to pressure, etc., the contact method between the protective sheet and the waveguide sheet or between the waveguide sheets is changed, thereby reducing the occurrence of Newton's rings, avoiding large-area contact adhesion between the sheets, and improving the display effect in existing lenses. The present invention further limits the position and structure of the support structure, allowing the contact method between the protective sheet and the waveguide sheet to be changed from different angles, which is advantageous for deformation recovery, avoids prolonged adhesion, improves the display performance of the display lens, and at the same time improves the deformation resistance capability of the display lens and improves the overall strength of the display lens. [Brief explanation of the drawing]

[0034] To more clearly illustrate the embodiments of this application or the technical concepts in the prior art, the following drawings are briefly introduced as necessary for use in the description of the embodiments or the prior art. Clearly, the drawings in the following description are only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these without requiring any creative work. [Figure 1] This is a top view of the structure of a display lens in one embodiment provided by the present invention. [Figure 2] This is a schematic diagram of the structure of a display lens in another embodiment provided by the present invention. [Figure 3] This is a schematic diagram of the structure of a display lens in another embodiment provided by the present invention. [Figure 4]This is a schematic diagram of the structure of a display lens in another embodiment provided by the present invention. [Figure 5] This is a schematic diagram of the structure of a display lens in another embodiment provided by the present invention. [Figure 6] This is a schematic diagram of the structure of a display lens in another embodiment provided by the present invention. [Figure 7] This is a schematic diagram of the structure of a display lens in another embodiment provided by the present invention. [Figure 8] This is a schematic diagram of a display lens in another embodiment provided by the present invention. [Figure 9] This is a schematic diagram of a display lens in another embodiment provided by the present invention. [Figure 10] This is a top view of the structure of a display lens in one embodiment provided by the present invention. [Figure 11] This is a schematic diagram of a display lens in another embodiment provided by the present invention. [Figure 12] This is a schematic diagram of a display lens in another embodiment provided by the present invention. [Figure 13] This is a schematic diagram of a display lens in another embodiment provided by the present invention. [Figure 14] This is a schematic diagram of a display lens in another embodiment provided by the present invention. [Figure 15] This is a flowchart of the manufacturing method for the display lens provided by the present invention. [Modes for carrying out the invention]

[0035] The technical concepts of the embodiments of this application will be clearly and completely described below with reference to the drawings of the embodiments of this application. The embodiments described are only a selection of embodiments of this application, not all embodiments. All other embodiments that can be obtained by a person skilled in the art without requiring any creative work based on the embodiments of this application are all within the scope of protection of this application.

[0036] The terms “First,” “Second,” “Third,” “Fourth,” etc. (if any) in the specification and claims of this application, and in the drawings above, are not intended to describe a specific order or sequence of steps, but rather to distinguish similar subjects. The data used in this manner are interchangeable where appropriate, and it should be understood that the embodiments of this application described herein may be carried out in an order other than that illustrated or described herein. Furthermore, the terms “includes” and “has” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units explicitly listed, and may include other steps or units not explicitly listed or specific to those processes, methods, products or devices.

[0037] The present invention provides a display lens comprising at least one waveguide sheet 130 and at least one protective sheet 110, wherein the waveguide sheet 130 and the protective sheet 110 are laminated together, and the waveguide sheet 130 is laminated with the protective sheet 110 and connected via a connecting member 120, and a grid structure is provided on one side surface of the waveguide sheet 130 facing the protective sheet 110, the grid structure includes an incident coupling grid 150 and an exit coupling grid 140, and a support structure 210 is provided on at least one opposing surface between the protective sheet 110 and the waveguide sheet 130, the surface of the support structure 210 is an uneven surface, and the support structure 210 is configured not to affect the optical path of the waveguide sheet and thereby not to change the optical propagation path diameter.

[0038] In this application, "not affecting the optical path in the waveguide sheet" means not adversely affecting the original incident coupling, forwarding, and exit coupling optical paths in the waveguide sheet, thereby resulting in performance inferior to the original. However, support structures that can provide a favorable effect also fall within the scope of protection sought by this application.

[0039] Providing a support structure 210 on at least one opposing surface between the protective sheet 110 and the waveguide sheet 130 includes providing a support structure on one side surface of the protective sheet facing the waveguide sheet, providing a support structure on one side surface of the waveguide sheet facing the protective sheet, and providing support structures on both opposing surfaces of the protective sheet and the waveguide sheet.

[0040] The surface of the support structure 210 is non-smooth; that is, the formed surface of the support structure 210 is not planar and includes a plurality of randomly dispersed or regularly distributed protrusions, which prevent contact between the waveguide sheet and the protective sheet, and the dimension of the protruding portion in at least one direction is approximately 5 to 1000 times the grid period, so as not to damage the grid structure and not to cause large-area contact with the waveguide sheet. In other words, the non-smooth surface of the present invention prevents large-area contact with the waveguide sheet overall due to the support structure, and instead exhibits localized contact of multiple small areas, similar to small-area contact covering multiple grid tooth areas.

[0041] The limited connecting member may be an adhesive layer having connecting ability, such as a curing adhesive or OCA adhesive, and the connecting member is provided at the edge of the waveguide and used only to connect the waveguide sheet and the protective sheet, and any limitations on the material, thickness or width can be made by a person skilled in the art during the specific design.

[0042] In Example 1, a support structure is provided on one side surface of the protective sheet 110 facing the waveguide sheet 130. As shown in Figures 1 to 5, in this embodiment, the support structure 210 is provided at least within the orthographic projection region on the protective sheet 110 of the grid structure. That is, referring to Figures 2 to 5, the support structure is provided at least directly above the grid structure.

[0043] As can be understood, a gap exists between the protective sheet and the waveguide sheet. Typically, the lattice structure is located in the intermediate region of the waveguide surface. Due to the action of external forces, inter-sheet contact formed after the protective sheet and / or waveguide sheet are deformed occurs mostly in the region where the lattice structure is located. This embodiment 1 breaks with the conventional thinking of the prior art by providing the support structure at least within the orthographic projection region on the protective sheet of the lattice structure, and by making the surface of the support structure adjacent to the waveguide sheet an uneven surface. This allows for a change in the contact method between the protective sheet and the waveguide sheet or between the waveguide sheets themselves, avoiding large-area contact adhesion between the sheets. Furthermore, the changed inter-sheet contact method is also advantageous for recovering the deformation of the protective sheet or waveguide sheet, thereby reducing the occurrence of Newton's rings and improving the display effect in existing lenses, resulting in unexpected technical benefits.

[0044] The waveguide sheet may be a resin sheet or a glass sheet, if feasible. The protective sheet may also be a resin sheet or a glass sheet.

[0045] Furthermore, as shown in Figure 1, the orthographic projection region on the protective sheet of the grid structure is also called the grid structure projection region 310, and the one side surface of the protective sheet facing the waveguide sheet includes at least the grid structure projection region 310, the connecting optical path projection region 320, and the peripheral projection region, where the connecting optical path projection region 320 is defined as the orthographic projection on the protective sheet of the region of the optical path connected to the positions where the incident coupling grid 150 and the exit coupling grid 160 are located. The peripheral projection region is defined as the orthographic projection on the protective sheet of the region of the ineffective optical path, i.e., the region other than the grid structure projection region 310 and the connecting optical path projection region 320. The support structure 210 may be provided not only within the grid structure projection region but also extend to other regions other than the grid structure projection region. For example, as shown in Figures 2-3 and 5, it may be extended to the connecting optical path projection region 320, and further extended to the peripheral projection region, for example, as shown in Figure 4.

[0046] Furthermore, the lattice structure further includes a folded lattice, in which case the connected optical path projection region is defined as the orthographic projection on a protective sheet of the area where the incident coupled lattice, folded lattice, and exit coupled lattice are located and the area of ​​the connected optical path. Of course, in some other embodiments, the lattice structure may further include other functional lattices, such as a recovery lattice, in which case the connected optical path projection region is defined as the orthographic projection on a protective sheet of the area where the lattice structure is located, the area where each lattice within the lattice structure is located and the area of ​​the connected optical path.

[0047] Furthermore, in Example 2, the support structure 210 includes a curing adhesive and fine particles filled within the curing adhesive, and the particle size of the fine particles is greater than the height of the cured layer formed after the curing adhesive has cured. Of course, the fine particles shown in Figure 5 are merely examples and do not limit the quantity or position, and any adjustments or limitations to the position or quantity made by those skilled in the art based on the inventive concept of the present invention are all within the scope of protection of the present invention. Practically, the spacing distribution of different fine particles in the support structure may be limited to control the spacing between different fine particles between 0.2 mm and 20 mm in order to prevent large-area contact adhesion between the protective sheet and the waveguide sheet and to prevent the support structure from affecting the optical path in the waveguide sheet.

[0048] In the above embodiment, the particle size of the microparticles is limited to be greater than the height of the cured layer formed after the curing adhesive has cured. After the curing adhesive has cured, the microparticles protrude from the cured layer, and the protruding microparticle structure enhances the formation of point contact rather than surface contact when the protective sheet 110 and the lattice structure region come into contact, reducing the possibility of Newton's ring formation. The point contact method facilitates deformation recovery, improves recovery performance, releases contact between sheets, and further reduces the possibility of Newton's ring formation. Furthermore, considering the process possibilities and actual display effects, the particle size of the microparticles is limited to be greater than 1 μm to prevent the microparticles from affecting the propagation of light. Furthermore, the particle size of the microparticles may be limited to be smaller than the gap distance when the waveguide sheet and the protective sheet are connected, thereby preventing the particle size from being too large and affecting the waveguide connection.

[0049] In the support structure 210 within the lattice structure projection region, the particle size of the microparticles embedded in the cured layer is the same; that is, in the support structure 210, the thickness of the cured layer formed after the cured adhesive has cured remains constant at different locations. Furthermore, the particle size at different locations of the support structure 210 can be made different, i.e., microparticles of different particle sizes can be selected to improve the deformation recovery ability of the protective sheet 110. As shown in Figure 5, by selectively limiting the particle size of the microparticles in the lattice structure projection region to be different from the particle size of the microparticles in the connecting optical path projection region, the pressure resistance capability of the connecting optical path projection region is increased, which is advantageous for deformation recovery, thereby improving the protective sheet's recovery ability and the waveguide's display effect when subjected to pressure.

[0050] Furthermore, referring to Figures 2-4, in Example 3, the support structure 210 includes a plurality of support units. The support units shown in the figures are merely examples, and are not limitations in terms of tooth profile, number, and position. Any adjustments or limitations made by those skilled in the art based on the inventive concept of the present invention are all included within the scope of protection of the present invention.

[0051] As shown in Figures 2-4, the multiple support units of the support structure may be connected by a base.

[0052] Selectively, as shown in Figure 6, the multiple support units of the support structure may form independent support units, each independent of the others. Furthermore, referring to Figures 2 and 6, the multiple support units of the support structure may be independent of each other at different positions, and the heights at these different positions may be the same or different. Furthermore, the spacing between different support units may be limited to between 0.2 mm and 20 mm.

[0053] As shown in Figures 2-4, a support structure 210 having multiple support units is formed on the inner surface of the protective sheet 110. The multiple support units of the tooth profile structure are provided within the grid structure projection region and the connecting optical path projection region, but the tooth profile heights differ in different regions. For example, the height of the support units in the grid structure projection region differs from the height of the support units in the connecting optical path projection region. Exemplarily, the height of the support units in the connecting optical path projection region is higher than the support units in other regions. The formed support structure is higher in the connecting optical path projection region and lower in the grid structure projection region. This makes it easier for the tooth profile structure in the connecting optical path projection region to deform and recover in the connecting optical path projection region of the protective sheet. This promotes the deformation recovery of the entire protective sheet, prevents "stickiness" that occurs when the entire protective sheet is in prolonged contact with the grid structure region and the connecting optical path region between the grids, and further improves the display effect. Of course, the difference in height between the two can be limited based on the display effect, and the present invention does not limit this in any way.

[0054] As another improvement to the above-mentioned method, in Embodiment 4, as shown in Figures 2-4, in order to improve the deformation recovery ability of the peripheral region of the lattice structure projection area on the protective sheet, and in particular to improve the deformation recovery ability of the edge position close to the connecting member 120, a plurality of support units having a toothed structure are selectively provided within the lattice structure projection area, extending from outside the lattice structure projection area to the vicinity of the connecting member, and the toothed height covering the lattice structure area is made smaller than the toothed height of other areas, and the intermediate height of the formed support structure is made smaller than the peripheral height. With such a structure and height design, the load capacity of the peripheral edge of the protective sheet becomes stronger during the deformation process under pressure, and the peripheral edge can recover from deformation quickly, thereby promoting the recovery of the entire protective sheet to its original shape and preventing the protective sheet from being subjected to pressure for a long time and affecting the display effect, which has an unexpected technical effect.

[0055] Furthermore, to make it feasible, an improvement to the above embodiment, in embodiment 5, as shown in Figure 4, in order to improve the load capacity of the connecting optical path projection region and the peripheral projection region, the height of the support units in the lattice structure projection region and the connecting optical path projection region are made the same, but are limited to being different from the height of the support units in the peripheral projection region. Exemplaryly, only the support units in the lattice structure projection region are lower in height than the support units in other regions, but the height of the support structures in the connecting optical path projection region and the peripheral projection region are higher. This reduces compression damage to the lattice by the support structures and prevents deformation of the lattice structure, and on the other hand, it also improves the deformation recovery ability at the central and edge positions of the waveguide of the protective sheet, thereby improving the deformation recovery ability from multiple regions.

[0056] The lattice period of the lattice structure is usually set to 300 nm to 500 nm, but the tooth width of each support unit in the support structure may be limited to the micrometer level, and the structure of multiple support units is limited to being formed by imprint curing of a curing adhesive or etching of a photoresist. The tooth width of each support unit in the support structure is further limited to more than 10 times the tooth width of each lattice unit, that is, one support unit of the support structure can cover multiple or more lattice units, and in this configuration the support unit structure of the support structure can be prevented from destroying or compressing the lattice structure, thereby protecting the lattice structure and preventing large-area contact between the support structure and the waveguide sheet when deformation appears in the display lens, reducing the occurrence of Newton's rings and improving the display capability of the display lens.

[0057] The tooth width of the support unit may be limited to a range of 2 μm to 150 μm, and may be further limited to 50 μm to 120 μm considering the effect on the visual appearance. Regarding the height limitation, the height of each support unit is made smaller than the height of the connecting member, but larger than the height of the lattice structure. Since the height of the lattice is usually several tens to several hundreds of nanometers, the height of the support unit may be controlled within the range of 1 μm to 0.2 mm. Regarding the spacing between support units, the spacing between different support units is controlled to be between 0.2 mm and 20 mm.

[0058] In Example 6, as shown in Figure 7, the waveguide sheet includes at least two layers of waveguide sheets 130 and at least one layer of protective sheet 110, with the waveguide sheets and protective sheet laminated together. A grid structure is provided on one side of each layer of waveguide sheet, a support structure 210 is provided on one side surface of the protective sheet 110 facing the grid structure, and another support structure 210 is provided on one side surface of the intermediate waveguide sheet facing the other waveguide sheet. The support structure 210 is provided at least within the orthographic projection region of the grid structure of the waveguide sheet in the protective sheet. The support structure may be limited to any one of the above embodiments, and the support structure in Figure 7 is only one example.

[0059] Simultaneously, the present invention relates to a display device including a display lens of any one of the above embodiments. Furthermore, the display device includes AR glasses or a HUD, etc.

[0060] In the above embodiment, the support structure is provided within the orthographic projection region of at least the lattice structure of the protective sheet, and the surface of the waveguide sheet adjacent to the support structure is limited to being a non-smooth surface. This allows for the avoidance of large-area contact adhesion between sheets when the protective sheet and / or waveguide sheet deform due to pressure or the like, by changing the contact method between the protective sheet and the waveguide sheet or between the waveguide sheets. Furthermore, the contact method between sheets in this application is advantageous for deformation recovery, thereby reducing the occurrence of Newton's rings, improving the display effect of existing lenses, and providing unexpected technical benefits.

[0061] Furthermore, in Example 7, as shown in Figures 8-9, as is well known, the projected light rays of the optical instrument are incident on the incident coupling grating 150, undergo total internal reflection within the waveguide sheet, and are emitted from the exit coupling grating 140 into the projection region. A grating structure region (the region where the incident coupling grating and exit coupling grating are located, connected by dashed lines in Figure 1) is formed in the entire region where the incident coupling grating 150 and the exit coupling grating 140 are connected, and a support structure 210 is provided outside the grating structure region, and the support structure 210 surrounds the grating structure region. The cross-section of the support structure 210 may be limited to annular and / or point-shaped, and the support structure 210 may be in different positions, and its shape and height may be the same or different, and the support structure 210 is configured so as not to affect the optical path of the waveguide sheet.

[0062] The term "ring-shaped" can be understood as consisting of arc-shaped or linear structures that support a protective sheet and prevent deformation, or forming a closed ring structure with multiple arc-shaped or linear structures.

[0063] In the applicable embodiment, a support structure is provided on one surface of the waveguide sheet facing the protective sheet, and further includes support structures provided on both opposing surfaces of the protective sheet and the waveguide sheet. The waveguide sheet may be a resin sheet or a glass sheet. The protective sheet may be a resin sheet or a glass sheet.

[0064] In the applicable embodiment, Figure 10 is a schematic cross-sectional view of the display lens, and the support structure 210 has an annular and / or point-shaped cross-section. Figures 8-9 show cross-sections of the support structure 210, and selectively, the cross-section of the support structure is rectangular, but of course, it may be other shapes, such as trapezoidal, inverse trapezoidal, or arc-shaped structures. This application does not limit this in any way, and all of these are within the scope of the present invention.

[0065] Of course, when combined with the above embodiment, the support structure 210 includes a plurality of support units, which are randomly arranged on the surface of the waveguide sheet facing one side of the protective sheet or on the opposing surfaces including the protective sheet and the waveguide sheet, and the parameters such as the shape, size, height, and position of each support unit may all be different, forming a "random" and disordered support unit. The number, position, size, etc. of the support units should be appropriately selected based on the situation of the Newton's ring phenomenon caused by the diffracted optical waveguide.

[0066] Referring to Figure 8, the support structure 210 includes a plurality of support units, each of which is point-shaped, and the height, width, and position of the support units differ at different locations. For the purpose of this configuration, when different locations of the protective sheet are subjected to pressure, the contact method can be changed by the action of the support structures when they come into contact with the support structures, and deformation can be recovered, and deformation can be recovered at all different locations. As shown in Figure 8, the plurality of support units of the support structure 210 have different heights and widths at different locations. It may be further limited to the height increasing sequentially and the width increasing sequentially along the direction toward the connecting member 120 away from the grid structure. Alternatively, the height of the plurality of support units of the support structure 210 decreases sequentially along the direction toward the connecting member 120 away from the grid structure. The height of the plurality of support units of the support structure 200 at one end increases sequentially and the height of the opposite end decreases sequentially, or the arrangement of plurality of support structure units of different heights in a sequential alternating pattern is also part of the embodiments of this application. Furthermore, by limiting the height of the support structure 210 to be greater than the height of the lattice structure and greater than 400 nm, the support structure can help the protective sheet 110 recover from deformation quickly, and at the same time prevent the performance of the diffracted optical waveguide from being affected by the destruction of the lattice structure region due to pressure deformation of the protective sheet. In addition, the height of the support structure can be limited to be smaller than the gap distance when the waveguide sheet and the protective sheet are connected, thereby preventing the height of the support structure from affecting the connection performance of the waveguide.

[0067] In the embodiment described herein, a support structure is provided between the waveguide sheet and the protective sheet. By changing the contact method between the protective sheet and the waveguide sheet using annular and / or point-shaped support structures, large-area adhesion between the two is avoided, and the occurrence of Newton's rings is reduced. Furthermore, the contact method in this application can improve the condition in which deformation occurs when the protective sheet is subjected to pressure, is advantageous in terms of deformation recovery, prevents "long-term adhesion" between the protective sheet and the waveguide sheet, thereby further reducing the occurrence of Newton's rings, improving the display effect of existing lenses, and providing unexpected technical benefits.

[0068] Furthermore, referring to Figure 9, a first support structure 2101 is provided on one side surface of the waveguide sheet 130 facing the protective sheet 110. A second support structure 2102 is provided on the opposing surface of the waveguide sheet 130 facing the lattice structure region. For example, the second support structure 2102 is provided on one side surface of the protective sheet 110 facing the waveguide sheet 130, and the first support structure 2101 surrounds the lattice structure region. The first support structure 2101 on the waveguide sheet surface and the second support structure 2102 on the protective sheet surface are in contact with each other. That is, the first support structure 2101 and the second support structure 2102 are formed, corresponding to each other vertically, and the orthographic projections of the support structures overlap.

[0069] In this embodiment, by providing support structures in a manner that they abut each other, it is possible to effectively prevent the protective sheet from coming into contact with the lattice structure and other areas when the protective sheet is subjected to pressure deformation, thereby preventing the occurrence of Newton's rings and reducing the Newton's ring phenomenon. Furthermore, by providing support structures on opposing surfaces of the waveguide sheet and the protective sheet, the manufacturing difficulty of a single, high-height support structure in the prior art can be effectively reduced. The two-stage abutment configuration reduces the difficulty of the manufacturing process and prevents deformation or breakage, such as cutting or bending, that occurs when a high-height support structure is subjected to pressure multiple times, thereby improving the service life of the diffracted optical waveguide according to the embodiment of this application.

[0070] The first support structure 2101 and the second support structure 2102 include a plurality of support units, where support units in the same positional region are in contact with each other and their orthographic projections overlap, and different numbers of support units are included at different positions. Of course, in combination with the above, Figure 9 only shows an example in which the cross-sections of the first support structure 2101 and the second support structure 2102 are rectangular, but as is well known, support units at different positions or upper and lower support units at the same position may be selected as an arc-shaped structure, which is "ring-shaped", or a "point-shaped" support structure, as shown in Figure 10, or they may be freely combined, and these are within the scope of this application.

[0071] Furthermore, regarding the inclusion of multiple support units in the first support structure 2101 and the second support structure 2102, the height and width of the support units at different positions may be the same or different, and the structure of each support unit may be the same or different. From the edge adjacent to the connecting member 120 to the portion adjacent to the grid structure area, the distance at which the first support structure 2101 and the second support structure 2102 abut each other increases, meaning that a change occurs in which their heights gradually increase or decrease. When the form shown in the drawing is adopted, when the protective sheet 110 or the waveguide sheet 130 is subjected to pressure, the protective sheet preferentially contacts the edge portion of the waveguide sheet, thereby preventing contact with the structural area in the center of the waveguide, thereby protecting the grid structure to a certain extent and preventing damage due to compression.

[0072] The widths of the support units in different regions differ; for example, the width of the first support structure is greater than that of the second support structure, or the width of the second support structure is greater than that of the first support structure. The purpose of such a design is to limit the total height of the support structure to typically between 1 μm and 0.2 mm. Considering the possibility of the process and the process of adhering the protective sheet and waveguide sheet together, the widths of the upper and lower first support structure 2101 and second support structure 2102 are limited to be different, thereby increasing the deformation resistance capability and allowing for rapid deformation recovery even at different positions. The heights of the upper and lower first support structure 2101 and second support structure 2102 may be greater than the height of the lattice structure and limited to between 1 μm and 0.2 mm. This allows the support structure to help the protective sheet 10 to recover from deformation quickly, while simultaneously preventing the lattice structure region from being damaged by pressure deformation of the protective sheet, thereby preventing an impact on the performance of the diffracted optical waveguide.

[0073] The first support structure 2101 and the second support structure 2102 include a plurality of support units, the heights of which the support units at different positions may differ, for example, a low-height support unit on the waveguide sheet and a high-height support unit on the protective sheet may abut each other, with their orthographic projections overlapping and fitting together, which is advantageous in improving the deformation resistance capability of the protective sheet. Alternatively, if a high-height support unit on the waveguide sheet and a low-height support unit on the protective sheet abut each other, it is sufficient to ensure that they abut and match each other, and of course, such a design is also applicable to annular and point-shaped support structures.

[0074] Furthermore, in Embodiment 8, as shown in Figure 10, a display lens for a diffracted optical waveguide is provided, comprising at least two layers of waveguide sheets 130 and at least one layer of protective sheet 110. The waveguide sheets 130 and protective sheet 110 are laminated and connected via a connecting member 120. A grid structure is provided on one side surface of each layer of waveguide sheet 130 facing the protective sheet 110. The grid structure includes an incident coupled grid 150 and an outgoing coupled grid 140. A grid structure region is formed in the area where the incident coupled grid 150 and the outgoing coupled grid 140 are connected. A first support structure 2101 is provided on one side surface of the waveguide sheet 130 facing the protective sheet 110, and a second support structure 2102 is provided on the opposing surface of the grid structure region facing the waveguide sheet 130. As shown in the drawing, the second support structure 2102 is provided on one side surface of the protective sheet 110 facing the waveguide sheet 130. Furthermore, a second support structure 2102 is provided between the two layers of waveguide sheets 130 on the waveguide sheets of the opposing surfaces of the grid structure region toward the lower waveguide sheet 130, that is, the structure of the first support 2101 surrounds the grid structure region. The first support structure 2101 on the surface of the waveguide sheet 130 and the second support structure 2102 on the surface of the protective sheet 110 are in contact with each other, and the first support structure 2101 and the second support structure 2102 include a plurality of support units, and the first support structure 2101 and the second support structure 2102 surround the grid structure region, and the plurality of support units of the first support structure 2101 and the second support structure 2102 are in contact with each other, so that the orthographic projections of the support units overlap each other. In addition, when combined with the above embodiment, the support structure may be limited to being annular, point-shaped, or a combination thereof. The support structure may adopt the structure of any one embodiment described above, and this application does not limit it in any way. Any such structure is included within the scope of protection of the claims of this application, as long as it does not deviate from the essence of this application.

[0075] In some embodiments of this application, the lattice structure further includes a folded lattice, in which case the lattice structure region is defined as the region shadow of the optical path connected to the positions where the incident coupled lattice, folded lattice, and exit coupled lattice are located. Of course, in some other embodiments, the lattice structure may further include other functional lattices, such as a retrieval lattice, in which case the lattice structure region is defined as the region where the lattice structure is located and the region of the optical path connected to the positions where each lattice within the lattice structure is located.

[0076] In this embodiment, a support structure is provided between the waveguide sheet and the protective sheet. The support structure includes a first support structure and a second support structure, each of which includes a plurality of support units. Each support unit is positioned to abut each other, and the orthographic projections of each support unit overlap each other. This prevents deformation from occurring when the protective sheet is subjected to pressure, allowing for rapid deformation recovery. The support structure prevents "long-term adhesion" between the protective sheet and the lattice structure region or non-structure region, thereby reducing the occurrence of Newton's rings, improving the display effect in existing lenses, and providing unexpected technical benefits. At the same time, considering the operability of the process and the frequency of pressure exposure of the diffractive optical waveguide, each support unit is positioned to abut each other, and the contact heights of support units at different positions are different. This reduces process challenges, improves the service life of the diffractive optical waveguide, and prevents pressure damage to support units with higher heights.

[0077] In another embodiment 9, the present application provides a display lens for a diffractive optical waveguide, which, as shown in Figure 1, comprises at least one waveguide sheet 130 and at least one protective sheet 110, the waveguide sheet 130 and the protective sheet 110 are laminated and connected via a connecting member 120, a lattice structure is provided on one side surface of the waveguide sheet 130 facing the protective sheet 110, the lattice structure comprises an incident coupled lattice 150 and an exit coupled lattice 140, the optical path region to which the incident coupled lattice 150 and the exit coupled lattice 140 are connected is defined as the lattice structure region, a first magnetic coating layer 200 is provided on the surface of the protective sheet 110 facing one side of the waveguide sheet 130, and the waveguide sheet A second magnetic coating layer 300 is provided on the surface of the protective sheet 110 facing one side, the projections of the first magnetic coating layer 200 and the second magnetic coating layer 300 overlap at least partially, the first magnetic coating layer 200 is provided within the orthographic projection region of the protective sheet 110 in the grid structure and extends outside the orthographic projection region, exemplary, the projections of the first magnetic coating layer 200 and the second magnetic coating layer 300 overlap on the waveguide sheet 130 or protective sheet 110, are provided facing and corresponding on the upper and lower surfaces, the second magnetic coating layer 300 is arranged to surround the grid structure, and the magnetism of the first magnetic coating layer 200 and the magnetism of the second magnetic coating layer 300 are different.

[0078] The first magnetic coating layer 200 and the second magnetic coating layer 300 are divided into multiple regions. The refractive index of the materials of the first magnetic coating layer 200 and the second magnetic coating layer 300 located within the orthographic projection region of the protective sheet 110 in the lattice structure is 2 or greater, and is greater than or equal to the refractive index of the lattice structure. The refractive index of the materials of the first magnetic coating layer 200 and the second magnetic coating layer 300 located outside the relevant orthographic projection region is between 1.0 and 1.5, and is configured so as not to affect the propagation of light rays in the optical path. The particle size of the fine particles in the coating layers of the first magnetic coating layer 200 and the second magnetic coating layer 300 is configured to be smaller than the spacing between the teeth of the lattice structure. Of course, the first magnetic coating layer 200 and the second magnetic coating layer 300 are provided as a support structure on at least one of the opposing surfaces of the waveguide sheet and the protective sheet.

[0079] Selectively, the surface of the support structure may be non-smooth, and non-smooth surfaces are formed at the locations where it connects to the waveguide sheet and the protective sheet.

[0080] As shown in Figure 12, the first magnetic coating layer 200 is divided into multiple regions, for example, multiple sub-regions such as A1, A2, A3, A4, and A5. The second magnetic coating layer 300 is divided into multiple regions, for example, multiple sub-regions such as B1, B2, B3, B4, and B5. When the first magnetic coating layer 200 and the second magnetic coating layer 300 cover a lattice structure, the orthographic projection of the relevant sub-regions covers the lattice structure, as shown in A2, A4, B2, and B4 in Figure 10. In order to consider the effect of the arrangement of the coating layers on the total internal reflection of light rays in the waveguide, the uniformity and brightness of the display are improved by limiting the refractive index of different regions, while ensuring the diffracted optical waveguide display effect, and ensuring the visual imaging effect within the eyebox. For example, the refractive index of the materials of the first magnetic coating layer 200 and the second magnetic coating layer 300 located within the relevant orthographic projection region is guaranteed to be 2 or greater, and greater than or equal to the refractive index of the lattice structure, i.e., the sub-regions A2, A4, B2, and B4. The refractive indices of the materials of the first magnetic coating layer 200 and the second magnetic coating layer 300 located outside the relevant orthographic region are between 1.0 and 1.5, and are configured so as not to affect the propagation of light rays in the optical path, thereby preventing crosstalk within the optical waveguide, such as multiple sub-regions A1, A3, A5, B1, B3, B5, etc. As is well known, Figure 10 is only one example, and of course, limiting the number or area of ​​sub-regions of the first magnetic coating layer 200 and the second magnetic coating layer 300, as well as the area of ​​the orthographic region, based on the area of ​​the lattice structure, is based on the concept of the present invention and is included within the scope of the protection scheme of this application.

[0081] Furthermore, referring to Figure 12, the second magnetic coating layer 300 may be selectively positioned to surround the lattice structure, or alternatively, the second magnetic coating layer may cover the lattice structure region, or the first magnetic coating layer may partially or entirely cover the surface of the protective sheet 10 facing the waveguide sheet.

[0082] In this embodiment, by providing two magnetic coating layers with different magnetic properties, when the protective sheet 110 is subjected to pressure and undergoes bending deformation due to the repulsive force between the coating layers, they are repelled from each other, thereby allowing the cover plate to return to its original state. By changing the contact method between the cover plate and the waveguide sheet, the occurrence of Newton's rings is effectively prevented. At the same time, based on the uniformity, diffraction efficiency, and uniformity requirements within the eyebox, the division and limitation of different regions of the different coating layers are controlled, and the lattice structure region and unstructured region are divided and arranged, and the refractive index of the different region coating layers is limited. This structural design has unexpected technical effects.

[0083] Furthermore, the first magnetic coating layer 200 and the second magnetic coating layer 300 are divided into multiple regions, and the refractive index of each region is different, in particular the refractive index of the inner and outer orthographic coating layers in the lattice structure region is different. On the one hand, the present invention avoids the Newton's ring phenomenon by changing the contact form of the existing lattice region and the cover plate, and on the other hand, considering the effect of the arrangement of the coating layers on the total internal reflection of light rays in the waveguide, the invention improves the uniformity and brightness of the display by limiting the refractive index of different regions, while ensuring the diffracted optical waveguide display effect, thereby ensuring the visual imaging effect within the eyebox.

[0084] Furthermore, referring to Figure 13, the first magnetic coating layer 200 and the second magnetic coating layer 300 are provided offset from each other, and it is sufficient that their projections overlap, or even partially overlap. This arrangement provides free space in the area on the waveguide sheet 30 and protective sheet 110 where the coating layers are provided. A person skilled in the art can determine the area and position of the coating layers based on the difficulty of the process, and at the same time, secure a certain space for the arrangement of the connecting member 20 on the subsequent waveguide side, facilitating the connection and black-painting arrangement of the subsequent waveguide. As long as these do not deviate from the concept of this application, they all fall within the scope of protection of this application.

[0085] Of course, the areas of the first magnetic coating layer 200 and the second magnetic coating layer 300 are different, and the area of ​​the first magnetic coating layer 200 may be limited to being larger than the area of ​​the second magnetic coating layer 300, with the projection of the first magnetic coating layer located within the projection area of ​​the second magnetic coating layer. Alternatively, the area of ​​the first magnetic coating layer 200 may be limited to being smaller than the area of ​​the second magnetic coating layer 300, with the projection of the second magnetic coating layer located within the projection area of ​​the first magnetic coating layer. By adjusting the area sizes of the different coating layers, the complexity of the process, especially the number of coating layer processes, or the amount of coating layer material can be reduced, and factors such as cost can be comprehensively considered.

[0086] By further limiting the thickness of the first magnetic coating layer 200 to less than the thickness of the second magnetic coating layer 300, and limiting the second magnetic coating layer 300 which has a thicker thickness, external pressure can be effectively mitigated. On the one hand, the large pressures that occur when the cover plate is subjected to pressure can be effectively mitigated, resulting in strong pressure resistance, allowing the cover plate to quickly recover from deformation, and effectively reducing the Newton's ring phenomenon. On the other hand, during the process of the cover plate and the second magnetic coating layer coming into contact, the cover plate is preferentially brought into contact with the second magnetic coating layer rather than the lattice structure, thereby effectively reducing contact between the cover plate and the lattice structure, preventing pressure damage from the cover plate to the lattice structure in the waveguide, and improving the service life of the diffracted optical waveguide. The first magnetic coating layer 200 completely covers the surface of the protective sheet 110 facing the waveguide sheet 130, and selectively, the first magnetic coating layer 200 is limited to a translucent magnetic material, such as a transparent magnetic material. This further strengthens the repulsive effect between the first magnetic coating layer and the second magnetic coating layer.

[0087] Feasible applications include selecting translucent magnetic materials such as thin iron oxide films, cadmium zinc germanium phosphide (CZGP), ferrite / zinc oxide (Fe3O4 / ZnO) nanometer composite materials, silver chromate (AgCrO2), iron-cobalt alloys, and novel aluminum fluoride mixtures as insulating materials.

[0088] To improve the imaging effect of the diffracted optical waveguide and prevent the coating layer from affecting the uniformity and brightness of the waveguide, the particle size range of the magnetic nanoparticles in the first magnetic coating layer 200 and the second magnetic coating layer 300 may be limited to 3 nm to 1.2 μm.

[0089] Furthermore, considering the influence of the lattice structure dimensions and the magnetic coating layer on the lattice diffraction efficiency, and in order to prevent adverse effects on imaging of fine particles in large coating layers, the particle size is controlled to be smaller than the spacing between teeth in the lattice structure. For example, the particle size range is limited to 3 nm to 300 nm, and further controlled to a range of 3 nm to 120 nm, or 10 nm to 150 nm, 10 nm to 200 nm, or even smaller, for example, within the range of 20 nm to 80 nm.

[0090] Therefore, based on the optical imaging principle, there is a high requirement for the particle size of the coating layer. The particle size is controlled to be smaller than the spacing between the teeth of the lattice structure. This prevents large particle sizes from causing additional optical effects on the light rays and introducing stray light that is detrimental to the imaging effect. It is feasible to control the particle size to, for example, below 300 nm, below 200 nm, below 120 nm, or below 80 nm to improve the uniformity and brightness of the light output.

[0091] Furthermore, it may be chosen to limit the second magnetic material to have a high refractive index; for example, by making the refractive index greater than 2.3, the diffraction effect can be improved, and there are no particular requirements for the refractive index of the first magnetic material as long as the optical imaging conditions are met.

[0092] If the second magnetic coating layer 300 is feasible and positioned to cover the lattice structure, it is selectively limited to including multiple areas of the first magnetic coating layer 200 on the surface of the protective sheet 110. Alternatively, the first magnetic coating layer 200 may completely cover the surface of the protective sheet 110, and the coating layer may cover the entire surface of the protective sheet 110. Of course, the height of the second magnetic coating layer 300 is determined based on the height of the lattice structure, and the height of the second magnetic coating layer 300 may be limited to or greater than the height of the lattice structure, or significantly greater than the height of the lattice structure. However, the height relationship between the height of the first magnetic coating layer 200 and the height of the second magnetic coating layer 300 can be appropriately adjusted based on the actual Newton's rings phenomenon, and is not limited in detail here.

[0093] A first magnetic coating layer 200 is provided on the surface of the protective sheet 110 facing one side of the waveguide sheet 30, and a second magnetic coating layer 300 is provided on the surface of the waveguide sheet 30 facing one side of the protective sheet 110. The projections of the first magnetic coating layer 200 and the second magnetic coating layer 300 overlap at least partially, the second magnetic coating layer covers only the lattice structure region, and the second magnetic material has a high refractive index, for example, a refractive index greater than 2.3. The refractive index of the first magnetic material only needs to satisfy the optical imaging conditions.

[0094] Furthermore, in Example 10, as shown in Figure 14, a display lens for a diffracted optical waveguide is provided, comprising at least two layers of waveguide sheets 30 and at least one layer of protective sheet 110, wherein the waveguide sheets 30 and protective sheet 110 are laminated and connected via a connecting member 20, and a lattice structure is provided on one side surface of the waveguide sheet 30 facing the protective sheet 110, the lattice structure includes an incident coupled lattice 50 and an exit coupled lattice 40, and the optical path region to which the incident coupled lattice 50 and the exit coupled lattice 40 are connected is defined as the lattice structure region, and protection A first magnetic coating layer 200 is provided on the surface of sheet 110 facing one side of the waveguide sheet 30, a second magnetic coating layer 300 is provided on the surface of waveguide sheet 30 facing one side of the protective sheet 110, and a first magnetic coating layer 200 is provided on the surface of the intermediate waveguide sheet facing the other waveguide sheet. The projections of the first magnetic coating layer 200 and the second magnetic coating layer 300 overlap at least partially and are provided facing each other on their upper and lower surfaces, and the magnetism of the first magnetic coating layer 200 and the magnetism of the second magnetic coating layer 300 are different.

[0095] In the applicable embodiment, the lattice structure further includes a folded lattice, in which case the lattice structure region is defined as the region shadow of the optical path connected to the positions where the incident coupled lattice, folded lattice, and exit coupled lattice are located. Of course, in some other embodiments, the lattice structure may further include other functional lattices, such as a recovery lattice, in which case the lattice structure region is defined as the region where the lattice structure is located and the region of the optical path connected to the positions where each lattice within the lattice structure is located.

[0096] In this embodiment, by creatively providing a first magnetic coating layer and a second magnetic coating layer with different magnetic properties on the opposing surfaces between the waveguide and the protective sheet of the diffractive optical waveguide, the contact method between the protective sheet and the waveguide is changed by utilizing the repulsive force between the first and second magnetic coating layers. When the protective sheet is subjected to external force and deformed by compression, the repulsive force between the first and second magnetic coating layers allows the protective sheet to recover its original deformation, reducing the Newton's ring phenomenon, improving the display effect of the diffractive optical waveguide, and simultaneously improving its durability. Furthermore, the first and second magnetic coating layers are divided into multiple regions, each with a different refractive index, particularly the refractive index of the inner and outer orthographic coating layers in the lattice structure region. On the one hand, the present invention avoids the Newton's ring phenomenon by changing the contact configuration of the existing lattice region and protective sheet, and on the other hand, considering the effect of the arrangement of the coating layers on total internal reflection in the waveguide, the invention improves the uniformity and brightness of the display by limiting the refractive index of different regions, while ensuring the diffracted optical waveguide display effect, preventing the introduction of stray light, and ensuring the visual imaging effect within the eyebox. Simultaneously, based on the difficulty and operability of the coating layer process, the position, area, and thickness of the protective sheets and waveguides for the first and second magnetic coating layers are adjusted. At the same time, the particle size of the coating layers is controlled to be smaller than the spacing between the teeth of the lattice structure, preventing large particle sizes from causing optical effects such as diffraction or reflection of light rays. The projection relationship between the first and second magnetic coating layers and the refractive index relationship between the projection regions of the lattice structure are limited to improve the display effect of the diffracted optical waveguide, avoid stray light, improve the uniformity, brightness, and diffraction efficiency of the eyebox, and simultaneously reduce or avoid the occurrence of Newton's rings as much as possible.

[0097] In Embodiment 11 of the present invention, the present invention provides a method for manufacturing a display lens, as shown in Figure 15, the display lens includes at least one waveguide sheet 130 and at least one protective sheet 110, wherein the waveguide sheet 130 and the protective sheet 110 are laminated together. The method includes the following steps.

[0098] S1: A grid structure is provided on the surface of the waveguide sheet 130 facing the protective sheet 110, and the grid structure includes an incident coupling grid 150 and an exit coupling grid 140.

[0099] S2: A support structure 210 is provided on one side surface of the protective sheet 110 facing the grid structure. The support structure 210 is provided at least within the orthographic projection region of the protective sheet with the grid structure. Furthermore, the surface of the support structure adjacent to the waveguide sheet is made an uneven surface.

[0100] S3: The waveguide sheet and protective sheet are connected via the connecting member 120 to form the display lens.

[0101] In step S1, the waveguide sheet and protective sheet include lightweight, thin materials such as optical waveguide glass or resin sheets, and a lattice structure may be formed by techniques such as etching or nanoimprinting. The lattice structure may be limited to including a limited, comprehensive one-dimensional lattice and / or a two-dimensional lattice, and the structural shape includes straight teeth, oblique teeth, flared lattices, or combinations thereof.

[0102] In step S2, the support structure 210 is provided on one side surface of the protective sheet 110 facing the lattice structure by forming the support structure by means of mold molding, printing, etching, nanoimprint, etc., and the support structure is provided at least within the orthographic projection region on the protective sheet of the lattice structure.

[0103] Regarding the selection of the material for the support structure, the curing adhesive and the fine particles filled within the curing adhesive as in the above embodiment may be selected. Alternatively, the structure may be limited to having multiple support units formed by curing of a limited-curing adhesive or by etching of a photoresist. When the support material is a curing adhesive and the fine particles filled within the curing adhesive, the support structure may be formed on a protective sheet by mold molding, printing, or inkjet printing, and the support structure can be controlled by limiting parameters such as the area, time, and height of the printing and inkjet printing, thereby forming multiple support units.

[0104] Furthermore, in step S2, if at least two layers of optical waveguide sheets are included, a grid structure is provided on one side of each layer of waveguide sheet, a support structure 210 is provided on one side surface of the protective sheet 110 facing the grid structure, and a support structure 210 is provided on one side surface of the other waveguide sheet located in the middle, and the support structure 210 is provided at least within the orthographic projection region of the grid structure of the waveguide sheet on the protective sheet.

[0105] This application relates to a display device including the display lens of any one of the above embodiments.

[0106] According to the display lens and display device provided by the present invention, a support structure is provided on one side of the protective sheet of the display lens, and the support structure is provided within the orthographic projection region of at least the lattice structure of the protective sheet, and the surface of the support structure adjacent to the waveguide sheet is provided as a non-smooth surface. By changing the contact method between the protective sheet and the waveguide sheet or between the waveguide sheets when deformation occurs due to pressure or the like, large-area contact adhesion between the sheets is avoided, the possibility of Newton's rings occurring is reduced, and the contact method between the sheets in this application is also advantageous for deformation recovery, avoids long-term adhesion, further reduces the possibility of Newton's rings occurring, improves the display effect of existing lenses, and has unexpected technical effects. Selectively, the present invention can further limit the position and structure of the support structure, allowing the contact method between the sheets to be changed from different angles, improving deformation recovery capability, improving the performance of the display lens, and representing a significant advance.

[0107] Finally, it should be noted that the above embodiments are for illustrative purposes only and are not limiting. Despite the detailed description of this application with reference to the above embodiments, those skilled in the art will still understand that they may modify the inventions described in the above embodiments or substitute some or all of their features with equivalent ones, and that such modifications or substitutions will not cause the essence of the corresponding inventions to deviate from the scope of the inventions described in the above embodiments.

Claims

1. It is a display lens, It includes at least one waveguide sheet and at least one protective sheet, The waveguide sheet and protective sheet are provided in a laminated manner. A grid structure is provided on one side surface of the waveguide sheet facing the protective sheet. The aforementioned lattice structure includes an incident coupled lattice and an exit coupled lattice, A support structure is provided on at least one opposing surface between the protective sheet and the waveguide sheet. The surface of the support structure is an uneven surface. The display lens is characterized in that the support structure is configured so as not to affect the optical path of the waveguide sheet.

2. A support structure is provided on one side surface of the protective sheet facing the grid structure. The display lens according to claim 1, characterized in that the support structure is provided at least within the orthographic projection region on the protective sheet of the grid structure.

3. The display lens according to claim 2, characterized in that the support structure is provided within the orthographic projection region on the protective sheet of the grid structure and extends outside the orthographic projection region.

4. The support structure includes a curing adhesive and fine particles filled within the curing adhesive. The display lens according to claim 2, characterized in that the particle size of the fine particles is greater than the height of the hardened layer formed after the hardened adhesive has hardened.

5. The support structure includes a plurality of support units, The display lens according to claim 2, characterized in that the heights of the support units within the grid structure projection region and the connecting optical path projection region are the same.

6. The display lens according to claim 5, characterized in that the plurality of support units are provided independently of each other.

7. The display lens according to claim 5, characterized in that the height of the support units within the grid structure projection region and the connecting optical path projection region differs from the height of the support units outside the grid structure projection region and the connecting optical path projection region.

8. The display lens according to claim 5, characterized in that the tooth width of the multiple support units is greater than 10 times or more the tooth width of each grid unit.

9. The tooth width of each support unit in the plurality of support units is 2 μm to 150 μm. Furthermore, the tooth width of each support unit is limited to 50 μm to 120 μm. The display lens according to claim 5, characterized in that the height of each support unit is 1 μm to 0.2 mm.

10. It includes at least two waveguide sheets and at least one protective sheet, The waveguide sheet and the protective sheet are provided laminated together. A grid structure is provided on one side surface of the waveguide sheet of each layer. The support structure is provided on one side surface of the protective sheet facing the grid structure, and the support structure is also provided on one side surface of the intermediate waveguide sheet facing the other waveguide sheet. The display lens according to claim 2, characterized in that the support structure is provided at least within the orthographic projection region of the protective sheet of the lattice structure of the waveguide sheet.

11. A lattice structure region is formed in the region where the incident coupled lattice and the exit coupled lattice are located and in the connected region. A support structure is provided outside the aforementioned lattice structure region, and the support structure surrounds the aforementioned lattice structure region. The display lens according to claim 1, characterized in that the cross-section of the support structure is annular and / or point-shaped.

12. The display lens according to claim 10, characterized in that the height of the support structure is lower than the height of the connecting member and higher than the height of the grid structure.

13. A first support structure is provided on one side surface of the waveguide sheet facing the protective sheet. A second support structure is provided on one side surface of the protective sheet facing the waveguide sheet. The first support structure surrounds the lattice structure region, The display lens according to claim 10, characterized in that the first support structure on the surface of the waveguide sheet and the second support structure on the surface of the protective sheet are in contact with each other.

14. The first support structure and the second support structure are such that the orthographic projections on the protective sheet or the waveguide sheet overlap each other. The display lens according to claim 12, characterized in that the first support structure and the second support structure include a plurality of support units.

15. The heights of the first support structure on the waveguide sheet surface and the second support structure on the protective sheet surface are different, and / or The display lens according to claim 1, characterized in that the widths of the first support structure on the surface of the waveguide sheet and the second support structure on the surface of the protective sheet are different.

16. It is a display lens, It includes at least one waveguide sheet and at least one protective sheet, The waveguide sheet and protective sheet are provided in a laminated manner. A grid structure is provided on one side surface of the waveguide sheet facing the protective sheet. A first magnetic coating layer is provided on the surface of the protective sheet facing one side of the waveguide sheet. A second magnetic coating layer is provided on the surface of the waveguide sheet facing the protective sheet side. The projections of the first magnetic coating layer and the second magnetic coating layer overlap at least partially. The first magnetic coating layer is provided within the orthographic projection region of the protective sheet of the lattice structure and extends outside the orthographic projection region. A display lens characterized in that the magnetism of the first magnetic coating layer and the magnetism of the second magnetic coating layer are different.

17. The display lens according to claim 16, characterized in that the first magnetic coating layer and the second magnetic coating layer are divided into a plurality of regions.

18. The refractive indices of the materials of the first magnetic coating layer and the second magnetic coating layer located within the orthographic region are 2 or greater, and are greater than or equal to the refractive index of the lattice structure. The display lens according to claim 17, characterized in that the refractive indices of the first magnetic coating layer and the second magnetic coating layer located outside the orthographic projection region are between 1.0 and 1.5, and are configured so as not to affect the propagation of light rays in the optical path.

19. The display lens according to claim 16, characterized in that the particle size of the fine particles in the coating layers of the first magnetic coating layer and the second magnetic coating layer is configured to be smaller than the spacing between the teeth of the lattice structure.

20. The second magnetic coating layer is configured to surround the lattice structure, or, The display lens according to claim 16, characterized in that the second magnetic coating layer is configured to cover the lattice structure.

Images