Display lens

Abstract

A display lens, wherein a support structure (210) is provided on at least one of opposite surfaces of a protective member (110) and waveguide members (30, 130), the support structure (210) having a non-smooth surface. By providing different support structures (210) at different positions, and defining the structures and positions of the support structures (210), when the protective member (110) and / or the waveguide members (30, 130) deform, such as being pressed, the state of contact between the protective member (110) and the waveguide members (30, 130) or between the waveguide members (30, 130) changes, in order to reduce Newton's rings, thereby improving the display effect in existing lenses. In addition, the position and structure of the support structure (210) are defined such that the state of contact between the protective member (110) and the waveguide members (30, 130) can be changed from different angles, thereby improving the display performance of the display lens, whilst also enhancing the deformation resistance of the display lens, increasing the overall strength of the display lens.

Description

A display lens Technical Field

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

[0002] Among existing related technologies, optical waveguides have benefited from the development of related technologies such as AR and VR, and smart glasses have gradually become popular in daily life. In order to improve the color display effect and make the equipment lighter and thinner, the thickness of the waveguide components is usually reduced or a lighter and thinner material is selected as a replacement. Due to the lightness and flexibility of this type of material, it is difficult to withstand pressure. While achieving lightweight, it also brings new problems to the waveguide components. For example, the overall strength or rigidity of the waveguide components is poor, and they are prone to bending and deformation during use. In particular, if they are subjected to pressure or collision during use, it is easy to cause large-area contact and adhesion between the waveguide components, resulting in Newton rings. The waveguide components are difficult to restore to their original state, which in turn affects the display effect of the diffraction optical waveguide. How to avoid the occurrence of this phenomenon has become a technical pain point in the industry.

[0003] The present invention aims to solve the above technical problems and provide a display lens to reduce the generation of Newton rings in waveguides. Summary of the Invention

[0004] The present application provides a display lens and a method for manufacturing the display lens, which improves the deformation of the protective sheet when under pressure, avoids large-area contact between the waveguide sheet and the protective sheet, and makes it easier to recover from deformation. The existing contact form between the grating area and the protective sheet is changed to avoid the Newton ring phenomenon, while also improving the overall strength of the display lens.

[0005] A display lens, characterized in that it includes at least one waveguide sheet and at least one protective sheet, the waveguide sheet and the protective sheet being stacked, a grating structure being provided on a surface of the waveguide sheet facing the protective sheet, the grating structure including an in-coupling grating and an out-coupling grating, and a support structure being provided on at least one opposing surface between the protective sheet and the waveguide sheet, the support structure surface being a non-smooth surface, and the support structure being configured so as not to affect the optical path of the waveguide sheet.

[0006] Furthermore, a support structure is provided on the surface of the protective sheet facing the grating structure, the support structure is provided at least within the orthographic projection area of ​​the grating structure on the protective sheet, the surface of the support structure close to the waveguide sheet is a non-smooth surface, and the support structure is configured not to affect the optical path of the waveguide sheet.

[0007] The supporting structure is arranged in an orthographic projection area of ​​the grating structure on the protection sheet and extends outside the orthographic projection area.

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

[0009] In one embodiment, the invention comprises at least two layers of waveguide plates and at least one layer of protective plate, wherein the waveguide plates and the protective plate are stacked, a grating structure is provided on one side surface of each waveguide plate, the support structure is provided on the side surface of the protective plate facing the grating structure, and the support structure is provided on the side surface of the middle waveguide plate facing another waveguide plate, and the support structure is provided at least within the positive projection area of ​​the grating structure of the waveguide plate within the protective plate.

[0010] A display lens comprises at least one waveguide sheet and at least one protective sheet, the waveguide sheet and the protective sheet being stacked, a grating structure being provided on a surface of the waveguide sheet facing the protective sheet, the grating structure comprising an in-coupling grating and an out-coupling grating, the grating structure region being formed by the regions where the in-coupling grating and the out-coupling grating are located and the connected regions, a first supporting structure being provided on a surface of the waveguide sheet facing the protective sheet, and a second supporting structure being provided on a surface of the protective sheet facing the waveguide sheet, the first supporting structure surrounding the grating structure region; the first supporting structure on the surface of the waveguide sheet and the second supporting structure on the surface of the protective sheet being in contact with each other.

[0011] The orthographic projections of the first supporting structure and the second supporting structure on the protection sheet or the waveguide sheet overlap with each other.

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

[0013] The first support structure on the surface of the waveguide plate and the second support structure on the surface of the protective plate have different heights and / or different widths. The cross-sections of the first and second support structures are ring-shaped and / or dot-shaped.

[0014] The tooth width of several of the support units is more than 10 times the tooth width of each grating unit.

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

[0016] Furthermore, it includes at least two layers of waveguide plates and at least one layer of protective plate, a grating structure is provided on the surface of each waveguide plate facing the protective plate, the first supporting structure is provided outside the grating structure area on each waveguide plate, and the second supporting structure is provided on the surface of the middle waveguide plate facing the other waveguide plate, the first supporting structure and the second supporting structure include a plurality of supporting units, the plurality of supporting units of the first supporting structure and the plurality of supporting units of the second supporting structure abut against each other, and the plurality of supporting units of the first supporting structure unit surround the grating structure area.

[0017] A display device comprises the display lens described in any one of the aforementioned embodiments.

[0018] In another embodiment, the projection light of the optical machine is coupled in by the coupling-in grating and is totally reflected in the waveguide and coupled out by the coupling-out grating. A grating structure area is formed by the area where the coupling-in grating and the coupling-out grating are located and the connected area. A supporting structure is provided outside the grating structure area, and the supporting structure surrounds the grating structure area. The cross-section of the supporting structure is annular and / or point-shaped, and the supporting structure is configured so as not to affect the optical path of the waveguide.

[0019] In another embodiment, a first magnetic coating is provided on the surface of the protective sheet facing the waveguide sheet, and a second magnetic coating is provided on the surface of the waveguide sheet facing the protective sheet, the projections of the first magnetic coating and the second magnetic coating at least partially overlap, the first magnetic coating is provided within the orthographic projection area of ​​the protective sheet when the grating structure is located and extends outside the orthographic projection area, and the magnetic properties of the first magnetic coating are different from those of the second magnetic coating.

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

[0021] The refractive index of the material of the first magnetic coating and the second magnetic coating located within the orthographic projection area is greater than or equal to 2 and not less than the refractive index of the grating structure; the refractive index of the material of the first magnetic coating and the second magnetic coating located outside the orthographic projection area is between 1.0 and 1.5, and is configured not to affect the propagation of light in the optical path.

[0022] The particle sizes of the coating particles of the first magnetic coating and the second magnetic coating are configured to be smaller than the spacing between the teeth of the grating structure.

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

[0024] The thickness of the first magnetic coating is smaller than that of the second magnetic coating.The first magnetic coating material and the second magnetic coating material are light-transmitting magnetic coating materials.

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

[0026] The thickness of the second magnetic coating material is greater than the height of the coupling-in grating and the coupling-out grating, and less than the height of the connecting member.

[0027] In one embodiment, the display lens includes at least two waveguide sheets and at least one protective sheet, the waveguide sheets and the protective sheet are stacked, a first magnetic coating is provided on the surface of the protective sheet facing the waveguide sheet, a second magnetic coating is provided on the surface of the waveguide sheet facing the protective sheet, and a first magnetic coating is provided on the surface of the middle waveguide sheet facing the other waveguide sheet, the projections of the first magnetic coating and the second magnetic coating at least partially overlap, and the magnetic properties of the first magnetic coating are different from those of the second magnetic coating.

[0028] A method for manufacturing a display lens, wherein the display lens comprises at least one waveguide sheet and at least one protective sheet, wherein the waveguide sheet and the protective sheet are stacked; the method is characterized in that the method comprises the following steps:

[0029] S1: Disposing a grating structure on a surface of the waveguide plate facing the protective plate, wherein the grating structure includes an in-coupling grating and an out-coupling grating;

[0030] S2: providing a support structure on a surface of the protective sheet facing the grating structure; the support structure is provided at least within an orthographic projection area of ​​the grating structure on the protective sheet; and a surface of the support structure close to the waveguide sheet is a non-smooth surface;

[0031] S3: Connecting the waveguide plate and the protection plate through a connecting member.

[0032] In step S2, providing a support structure on a surface of the protective sheet facing the grating structure specifically includes forming the support structure on the protective sheet by mold forming, printing, etching, nanoimprinting, or inkjet printing. The support structure includes a plurality of support units, and the tooth width of each support unit is greater than 10 times the tooth width of each grating unit.

[0033] The present application provides a display lens and a method for manufacturing the display lens. A support structure is provided on at least one surface facing each other between the protective sheet and the waveguide sheet, wherein the surface of the support structure is a non-smooth surface. The present application further defines various embodiments in which a support structure is provided on the surface of the protective sheet facing the grating structure, wherein the support structure is provided at least within the orthographic projection area of ​​the grating structure on the protective sheet or within the area surrounding the grating structure. By defining different support structures at different locations and defining the structure and position of the support structures, when the protective sheet and / or the waveguide sheet are deformed by pressure or the like, the contact mode between the protective sheet and the waveguide sheet, or between the waveguide sheets, is changed, thereby reducing the occurrence of Newton rings, avoiding large-area contact adhesion between the sheets, and improving the display effect of existing lenses. The present application further defines the position and structure of the support structure, thereby enabling the contact mode between the protective sheet and the waveguide sheet to be changed from different angles, thereby facilitating deformation recovery, avoiding prolonged adhesion, improving the display performance of the display lens, and simultaneously improving the deformation resistance of the display lens and the overall strength of the display lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0035] FIG1 is a top view of the structure of a display lens in an embodiment provided by the present invention;

[0036] FIG2 is a schematic structural diagram of a display lens in another embodiment provided by the present invention;

[0037] FIG3 is a schematic structural diagram of a display lens in another embodiment provided by the present invention;

[0038] FIG4 is a schematic structural diagram of a display lens in another embodiment provided by the present invention;

[0039] FIG5 is a schematic structural diagram of a display lens in another embodiment provided by the present invention;

[0040] FIG6 is a schematic structural diagram of a display lens in another embodiment provided by the present invention;

[0041] FIG7 is a schematic structural diagram of a display lens in another embodiment provided by the present invention;

[0042] FIG8 is a schematic diagram of a display lens in another embodiment provided by the present invention;

[0043] FIG9 is a schematic diagram of a display lens in another embodiment provided by the present invention;

[0044] FIG10 is a top view of the structure of a display lens in an embodiment provided by the present invention;

[0045] FIG11 is a schematic diagram of a display lens in another embodiment provided by the present invention;

[0046] FIG12 is a schematic diagram of a display lens in another embodiment provided by the present invention;

[0047] FIG13 is a schematic diagram of a display lens in another embodiment provided by the present invention;

[0048] FIG14 is a schematic diagram of a display lens in another embodiment provided by the present invention;

[0049] FIG15 is a schematic flow chart of a method for manufacturing a display lens provided by the present invention. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] The terms "first," "second," "third," "fourth," and the like (if any) in the specification and claims of this application and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the application described herein can be implemented in orders other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0052] The present invention provides a display lens, comprising at least one waveguide sheet 130 and at least one protective sheet 110. The waveguide sheet 130 and the protective sheet 110 are stacked and connected via a connector 120. A grating structure is provided on a surface of the waveguide sheet 130 facing the protective sheet 110. The grating structure includes an in-coupling grating 150 and an out-coupling grating 140. 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 non-smooth and is configured so as not to affect the optical path of the waveguide sheet, thereby not changing the propagation path of light.

[0053] It should be noted that the definition of "not affecting the optical path in the waveguide" in this application refers to not adversely affecting the original coupling, transmission, and outcoupling optical paths in the waveguide, thereby resulting in results worse than the original performance. However, support structures that can have a beneficial impact are also within the scope of protection of this application.

[0054] A support structure 210 is provided on at least one surface opposite to the protective sheet 110 and the waveguide sheet 130, including providing a support structure on the surface of the protective sheet facing the waveguide sheet, providing a support structure on the surface of the waveguide sheet facing the protective sheet, and providing a support structure on both opposite surfaces of the protective sheet and the waveguide sheet.

[0055] The surface of the support structure 210 is non-smooth. This means that the surface of the support structure 210 is not planar and includes a number of randomly or regularly distributed protrusions. These protrusions prevent contact between the waveguide plate and the protective plate. The size of these protrusions in at least one direction is approximately 5-1000 times the grating period, preventing damage to the grating structure and preventing large-area contact with the waveguide plate. In other words, the non-smooth surface of the present invention prevents the support structure from contacting the waveguide plate over a large area, rather than over a whole area. Instead, the contact occurs over a number of small, localized areas, such as small areas covering the area of ​​multiple grating teeth.

[0056] The defined connecting part can be an adhesive layer with connecting capability, such as curing glue, OCA glue, etc. The connecting part is set at the edge of the waveguide, and it is only for connecting the waveguide plate and the protective plate. The limitation of material, thickness or width is determined by technical personnel in this field during specific design.

[0057] In Example 1, a support structure is provided on the surface of the protective sheet 110 on one side facing the waveguide sheet 130, as shown in Figures 1 to 5. In this embodiment, the support structure 210 is limited to be provided at least within the orthographic projection area of ​​the grating structure on the protective sheet 110, that is, referring to Figures 2 to 5, a support structure is provided at least directly above the grating structure.

[0058] It is understandable that there is a gap between the protective sheet and the waveguide sheet. Usually, the grating structure is located in the middle area of ​​the waveguide surface. Under the action of external force, the inter-sheet contact formed after the protective sheet and / or waveguide sheet are deformed mostly occurs in the area where the grating structure is located. This embodiment 1 breaks the conventional thinking in the prior art and sets the support structure at least in the positive projection area of ​​the grating structure on the protective sheet, and sets the surface of the support structure close to the waveguide sheet as a non-smooth surface. In this way, the contact mode between the protective sheet and the waveguide sheet or between the waveguide sheets can be changed, avoiding large-area contact adhesion between the sheets. The changed inter-sheet contact mode is also conducive to restoring the deformation of the protective sheet or the waveguide sheet, thereby reducing the occurrence of Newton ring phenomenon, thereby improving the display effect in the existing lens, and having unexpected technical effects.

[0059] Practically, the waveguide sheet can be a resin sheet or a glass sheet; the protection sheet can be a resin sheet or a glass sheet.

[0060] Furthermore, as shown in FIG1 , the orthographic projection area of ​​the grating structure on the protective sheet is also referred to as the grating structure projection area 310. The surface of the protective sheet facing the waveguide sheet at least includes: the grating structure projection area 310, the connecting light path projection area 320, and the peripheral projection area, wherein the connecting light path projection area 320 is defined as the orthographic projection of the area of ​​the light path connected to the location of the coupling-in grating 150 and the coupling-out grating 160 on the protective sheet; the peripheral projection area is defined as the orthographic projection of the area of ​​the non-effective light path on the protective sheet, that is, the area outside the grating structure projection area 310 and the connecting light path projection area 320. The support structure 210 can not only be set in the grating structure projection area, but also extend to other areas outside the grating structure projection area. For example, as shown in FIG2-3 and FIG5 , it extends to the connecting light path projection area 320. For another example, as shown in FIG4 , it further extends to the peripheral projection area.

[0061] Furthermore, if the grating structure also includes a turning grating, the projection area of ​​the connected optical path is defined as the orthographic projection of the locations of the in-coupling grating, the turning grating, and the out-coupling grating, and the area of ​​the connected optical path, onto the protective sheet. Of course, in other embodiments, the grating structure may also include other functional gratings, such as a recycling grating. In this case, the projection area of ​​the connected optical path is defined as the orthographic projection of the area of ​​the grating structure, the locations of each grating within the grating structure, and the area of ​​the connected optical path, onto the protective sheet.

[0062] Furthermore, in Example 2, the support structure 210 includes a curing adhesive and microparticles filled in the curing adhesive, wherein the particle size of the microparticles is greater than the height of the cured layer formed after the curing adhesive is cured. Of course, the microparticles shown in FIG5 are merely examples and are not intended to limit the number and position. Any position and quantity adjustments made by those skilled in the art based on the inventive concept of the present invention are within the scope of protection of the present invention. Practically, the spacing distribution of different microparticles in the support structure can be limited to prevent large-scale contact and adhesion between the protective sheet and the waveguide sheet, and to prevent the support structure from affecting the optical path within the waveguide sheet, and the spacing between different microparticles can be controlled to be between 0.2 mm and 20 mm.

[0063] In the above embodiment, the particle size is limited to be larger than the height of the cured layer formed after the curing adhesive is cured. After the curing adhesive is cured, the particles protrude from the cured layer. The protruding particle structure reinforces point contact, rather than surface contact, between the protective sheet 110 and the grating structure area, reducing the possibility of Newton rings. Furthermore, point contact facilitates deformation recovery, improves recovery performance, eliminates inter-sheet contact, and further reduces the possibility of Newton rings. Further considering process feasibility and actual display effects, to prevent the particles from affecting light propagation, the particle size is limited to greater than 1 μm. Furthermore, the particle size can be limited to less than the gap between the waveguide sheet and the protective sheet, thereby preventing excessive particle size from affecting the waveguide connection.

[0064] The particle size of the microparticles embedded in the solidified layer of the support structure 210 within the projection area of ​​the grating structure is the same, that is, the thickness of the solidified layer formed after the curing glue in the support structure 210 is cured remains unchanged at different locations. Furthermore, it is practicable to make the particle size of the support structure 210 different at different locations, that is, to select microparticles of different particle sizes to improve the ability of the protective sheet 110 to recover from deformation. As shown in Figure 5, the particle size of the microparticles within the projection area of ​​the grating structure can be selectively limited to be different from the particle size of the microparticles within the projection area of ​​the connecting light path, so that the pressure-bearing capacity of the projection area of ​​the connecting light path is stronger, which is conducive to recovering deformation, thereby improving the recovery ability of the protective sheet under pressure and the display effect of the waveguide.

[0065] 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 for illustrative purposes only and are not intended to limit the tooth shape, number, or position. Any adjustments to the tooth shape, position, and number made by those skilled in the art based on the inventive concept of the present invention are within the scope of protection of the present invention.

[0066] It should be noted that several supporting units of the supporting structure can also be connected through a base, as shown in Figures 2-4.

[0067] Alternatively, the support units of the support structure can be independent of each other, forming independent support units, as shown in FIG6 . Furthermore, referring to FIG2 and FIG6 , the support units of the support structure can be independent of each other at different locations, and the heights at different locations can be the same or different. Furthermore, the spacing between the different support units is limited to between 0.2 mm and 20 mm.

[0068] As shown in Figures 2 to 4, a support structure 210 is formed on the inner surface of the protective sheet 110, which has a number of support units. The support units of the tooth-shaped structure are arranged in the grating structure projection area and the connecting light path projection area, but the tooth heights in different areas are different. For example, the height of the support units in the grating structure projection area is different from the height of the support units in the connecting light path projection area. For example, the height of the support units in the connecting light path projection area is higher than the support units in other areas, and the support structure formed in the connecting light path projection area is higher and the grating structure projection area is lower. In this way, the tooth-shaped structure with a higher connecting light path projection area can make the protective sheet connecting light path projection area easier to recover from deformation, thereby driving the entire protective sheet to recover from deformation, preventing the entire protective sheet from being in contact with the grating structure area and the connecting light path area between gratings for a long time and causing "stickiness", further improving the display effect. Of course, the height difference between the two can be limited according to the display effect, and the present invention does not impose any restrictions.

[0069] As another improvement of the above-mentioned scheme, Example 4, as shown in Figures 2 to 4, in order to enhance the ability of the peripheral area of ​​the grating structure projection area on the protective sheet to recover deformation, especially the ability of the edge position near the connector 120 to recover deformation, a plurality of support units with a toothed structure can be selectively arranged in the grating structure projection area and extended outside the grating structure projection area to the vicinity of the connector, and the tooth height covering the grating structure area is smaller than the tooth height of other areas, and the middle height of the formed support structure is smaller than the height of the peripheral portion. Through such a structure and height design, the peripheral portion of the protective sheet has a stronger bearing capacity during the compression deformation process, and the peripheral portion can quickly recover deformation, thereby driving the entire protective sheet to recover its original shape, preventing the protective sheet from being compressed for a long time and thus affecting the display effect. In this regard, it has an unexpected technical effect.

[0070] Furthermore, as an improvement to the aforementioned embodiment, Example 5, as shown in FIG4 , can be implemented. To enhance the load-bearing capacity of the connecting optical path projection area and the peripheral projection area, the support units within the grating structure projection area and the connecting optical path projection area are of equal height, but different in height from the support units within the peripheral projection area. For example, the support units within the grating structure projection area are lower than those in other areas, while the support structures within the connecting optical path projection area and the peripheral projection area are higher. This can reduce compressive damage to the gratings from the support structure, preventing deformation of the grating structure. Furthermore, it can enhance the deformation recovery capability of the protective sheet in the middle and edge areas of the waveguide, improving deformation recovery across multiple regions.

[0071] The grating period of the grating structure is typically set between 300nm and 500nm, while the tooth width of each support unit of the support structure can be limited to the micron level. The structure of the support units is defined as being formed by imprinting and curing a curing adhesive or etching a photoresist. Furthermore, the tooth width of each support unit in the support structure is defined as being at least 10 times the tooth width of each grating unit. This means that a single support unit of the support structure can cover multiple or even more grating units. This prevents the support units from damaging or compressing the grating structure, thereby protecting the grating structure. It also prevents large-area contact between the support structure and the waveguide when the display lens is deformed, reducing the generation of Newton rings and improving the display performance of the display lens.

[0072] For example, the tooth width of the support unit can be limited to the range of 2μm ~ 150μm. Considering the visual impact, it can be further limited to 50μm ~ 120μm. As for the height limitation, the height of each support unit is limited to less than the height of the connector, but greater than the height of the grating structure. Since the height of the grating is usually tens of nanometers to hundreds of nanometers, the height of the support unit can be controlled within the range of 1μm ~ 0.2mm. As for the spacing between support units, the spacing between different support units is controlled between 0.2mm ~ 20mm.

[0073] Embodiment 6, as shown in FIG7 , includes at least two waveguide sheets 130 and at least one protective sheet 110. The waveguide sheets and protective sheet are stacked, with a grating structure disposed on one side of each waveguide sheet. A support structure 210 is disposed on the surface of the protective sheet 110 facing the grating structure, and a support structure 210 is disposed on the surface of the intermediate waveguide sheet facing the other waveguide sheet. The support structure 210 is disposed at least within the orthographic projection area of ​​the grating structure of the waveguide sheet on the protective sheet. The support structure can adopt the structure defined in any of the aforementioned embodiments; the support structure in FIG7 is provided only as an example.

[0074] At the same time, the present invention seeks protection for a display device, the display device comprising the display lens of any of the aforementioned embodiments. Further, the display device comprises AR glasses or HUD, etc.

[0075] In the above embodiment, the support structure is limited to be provided at least within the orthographic projection area of ​​the grating structure on the protective sheet, and the surface of the support structure close to the waveguide sheet is provided as a non-smooth surface, so that when the protective sheet and / or the waveguide sheet are deformed by pressure or the like, the contact mode between the protective sheet and the waveguide sheet or between the waveguide sheets changes, thereby avoiding large-area contact adhesion between the sheets. Moreover, the inter-sheet contact mode in the present application is also conducive to recovering deformation, thereby reducing the occurrence of Newton ring phenomenon, improving the display effect in the existing lens, and having unexpected technical effects.

[0076] Furthermore, in Example 7, as shown in Figures 8 and 9, it can be understood that the projection light of the optical machine is coupled into the waveguide by the coupling-in grating 150, undergoes total internal reflection within the waveguide, and is coupled out to the projection area by the coupling-out grating 140. The entire area connected by the coupling-in grating 150 and the coupling-out grating 140 forms a grating structure area (such as the area where the coupling-in grating and the coupling-out grating connected by the dotted line in Figure 1 are located). A support structure 210 is provided outside the grating structure area, and the support structure 210 surrounds the grating structure area. The cross-section of the support structure 210 can be defined as an annular and / or dot-shaped. The support structure 210 can have the same or different shapes and heights at different locations. The support structure 210 is configured so as not to affect the optical path of the waveguide.

[0077] "Ring-shaped" can be understood as a structure composed of arcs or straight lines to support the protective sheet and prevent it from deformation, or a closed ring structure formed by several arcs or straight lines.

[0078] In this embodiment, the support structure is provided on the surface of the waveguide sheet facing the protective sheet, and further includes providing the support structure 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.

[0079] In this embodiment, as shown in Figure 10, which is a schematic cross-sectional view of the display lens, the cross-section of the support structure 210 is annular and / or dot-shaped. Figures 8 and 9 show cross-sections of the support structure 210. Optionally, the cross-section of the support structure is rectangular. Of course, other shapes are also possible, such as trapezoidal, inverted trapezoidal, and arcuate structures. This application does not impose any limitations on this, and all such shapes are within the scope of the present application.

[0080] Of course, in combination with the aforementioned embodiments, the support structure 210 includes a number of support units, which are scatteredly arranged on the surface of the waveguide plate facing the protective plate or included on the two opposite surfaces of the protective plate and the waveguide plate, and the shape, size, height, position and other parameters of each support unit may be different, forming "chaotic" and disordered support units; the number, position, size and other limitations of the support units are appropriately selected based on the situation in which the diffraction light waveguide produces the Newton ring phenomenon.

[0081] In conjunction with Figure 8, the support structure 210 includes a number of support units, which are point-shaped and have different heights, widths, and positions at different positions. The purpose of this arrangement is to facilitate that when the protective sheet is under pressure at different positions, the contact mode can be changed due to the action of the support structure when it contacts the support structure, and the deformation can be restored, and the deformation can be restored at different positions; as shown in Figure 8, the heights and widths of the support units of the support structure 210 are different at different positions. For example, it can be further defined that the height increases sequentially and the width increases sequentially in the direction away from the grating structure toward the connector 120. Alternatively, the heights of the support units of the support structure 210 decrease sequentially in the direction away from the grating structure toward the connector 120; the heights of the support units of the support structure 200 at one end increase sequentially, and the heights of the other end opposite thereto decrease sequentially, or the support structure units of different heights are alternately arranged in sequence, all of which belong to the embodiments of the present application. The height of the support structure 210 is also limited to be greater than the height of the grating structure, and can be limited to be greater than 400nm, so that the support structure can help the protective sheet 110 quickly recover its deformation, while preventing the compressive deformation of the protective sheet from damaging the grating structure area, thereby affecting the performance of the diffraction optical waveguide; further, the height of the support structure can be limited to be less than the gap distance when the waveguide sheet and the protective sheet are connected, so as to prevent the height of the support structure from affecting the connection performance of the waveguide.

[0082] In this embodiment, a support structure is provided between the waveguide plate and the protective plate, and the contact mode between the protective plate and the waveguide plate is changed by the ring-shaped and / or point-shaped support structure, thereby avoiding large-area adhesion between the two and reducing the occurrence of Newton ring phenomenon; and the contact mode in the present application can improve the state of deformation of the protective plate when under pressure, making it more conducive to recovering the deformation, and can prevent "long-term adhesion" between the protective plate and the waveguide plate, thereby further reducing the occurrence of Newton ring phenomenon, improving the display effect in the existing lens, and having unexpected technical effects.

[0083] Furthermore, referring to FIG9 , a first supporting structure 2101 is provided on the surface of the waveguide plate 130 facing the protective plate 110; a second supporting structure 2102 is provided on the surface of the waveguide plate 130 opposite the grating structure region. For example, the second supporting structure 2102 is provided on the surface of the protective plate 110 facing the waveguide plate 130, and the first supporting structure 2101 surrounds the grating structure region. The first supporting structure 2101 on the surface of the waveguide plate and the second supporting structure 2102 on the surface of the protective plate abut against each other, forming the first supporting structure 2101 and the second supporting structure 2102 corresponding to each other above and below, so that the orthographic projections of the supporting structures overlap.

[0084] In this embodiment, the support structures are arranged in a mutually abutting manner, which can effectively prevent the protective sheet from contacting the grating structure and other areas when the protective sheet is deformed under pressure, thereby preventing the generation of Newton rings and reducing the Newton ring phenomenon; further, by respectively arranging support structures on the opposite surfaces of the waveguide sheet and the protective sheet, the difficulty of manufacturing a single higher support structure in the prior art can be effectively reduced. By abutting the two sections, the process difficulty is reduced, and the higher support structure can be prevented from deformation or damage after multiple compressions, such as breaking, bending, etc., thereby improving the service life of the diffraction optical waveguide through the method of the present application.

[0085] The first support structure 2101 and the second support structure 2102 include a number of support units. The support units in the same position area abut against each other, and their orthographic projections overlap with each other. Different positions include different numbers of support units. Of course, in combination with the foregoing, 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. It can be known that the support units at different positions or the upper and lower support units at the same position can choose a "ring-shaped" arc structure or a "point-shaped" support structure as shown in Figure 10, or / and they can be freely combined, which belongs to the content of this application.

[0086] Furthermore, the first support structure 2101 and the second support structure 2102 include several support units, and the heights and widths of the support units at different positions may be the same or different. The structures of the various support units may be the same or different. From the edge close to the connector 120 to the area close to the grating structure, the distance between the first support structure 2101 and the second support structure 2102 abutting each other becomes larger, that is, the heights of the two change in an increasing or decreasing manner. When the method shown in the figure is adopted, when the protective sheet 110 or the waveguide sheet 130 is under pressure, the protective sheet and the edge portion of the waveguide sheet are preferentially contacted, thereby preventing the structural area in the middle of the waveguide from contacting, thereby better protecting the grating structure to a certain extent and preventing it from being damaged by compression.

[0087] The widths of the support units in different areas are different, such as 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 design is that the total height of the support structure is usually limited to between 1μm and 0.2mm, and the upper and lower support unit structures are aligned and abutted as much as possible in consideration of the process possibility and the process of bonding the protective sheet and the waveguide sheet, and the widths of the upper and lower first support structures 2101 and the second support structure 2102 are limited to be different, so that the deformation resistance is stronger and different positions can quickly recover the deformation; the heights of the upper and lower first support structures 2101 and the second support structure 2102 are greater than the height of the grating structure, and can be limited to 1μm~0.2mm, so that the support structure can help the protective sheet 10 to quickly recover its deformation, while preventing the grating structure area from being damaged due to the compressive deformation of the protective sheet, thereby affecting the performance of the diffraction optical waveguide.

[0088] The first supporting structure 2101 and the second supporting structure 2102 include a number of supporting units. The heights of the supporting units at different positions may be different. For example, the supporting units with lower height on the waveguide plate and the supporting units with higher height on the protective plate abut against each other, and their orthographic projections overlap with each other, and they abut against each other in a nested manner, which is beneficial to improving the ability of the protective plate to resist deformation; or, for example, the supporting units with higher height on the waveguide plate and the supporting units with lower height on the protective plate abut against each other, as long as the two can abut and cooperate with each other, of course, such a design is also applicable to ring-shaped and point-shaped supporting structures.

[0089] Further, in Example 8, as shown in FIG10 , a display lens of a diffraction light 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 the protective sheet 110 are stacked, and the waveguide sheets 130 and the protective sheet 110 are connected by a connector 120, and a grating structure is provided on the surface of each layer of waveguide sheet 130 facing the protective sheet 110, the grating structure comprises an in-coupling grating 150 and an out-coupling grating 140, and a grating structure area is formed by the area connected by the in-coupling grating 150 and the out-coupling grating 140, a first supporting structure 2101 is provided on the surface of the waveguide sheet 130 facing the protective sheet 110, and a second supporting structure 2102 is provided on the opposite surface of the grating structure area facing the waveguide sheet 130. As shown in the figure, a support structure 2101 is provided on the surface of the protective sheet 110 facing the waveguide sheet 130. A second support structure 2102 is provided; and between the two waveguide sheets 130, a second support structure 2102 is provided on the waveguide sheet on the opposite side of the bottom waveguide sheet 130 from the grating structure region, i.e., the first support structure 2101 surrounds the grating 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 abut against each other, the first support structure 2101 and the second support structure 2102 include a plurality of support units, the first support structure 2101 and the second support structure 2102 surround the grating structure region, and the plurality of support units of the first support structure 2101 and the second support structure 2102 abut against each other, so that the orthographic projections of the support units overlap; and in combination with the aforementioned embodiments, the support structure can be defined as a ring or a point, or a combination thereof. The support structure adopts the structure of any of the aforementioned embodiments, and this application does not impose any limitation thereto. All such structures fall within the scope of protection claimed in this application without departing from the essence of this application.

[0090] In some embodiments of the present application, the grating structure further includes a turning grating. In this case, the grating structure region is defined as the region of the optical path connected by the locations of the in-coupling grating, the turning grating, and the out-coupling grating. Of course, in other embodiments, the grating structure may further include other functional gratings, such as a recycling grating. In this case, the grating structure region is defined as the region of the grating structure and the region of the optical path connected by the locations of the gratings within the grating structure.

[0091] In this embodiment, a support structure is provided between the waveguide sheet and the protective sheet, the support structure including a first support structure and a second support structure, the first support structure and the second support structure including a plurality of support units, the support units being arranged in abutment with each other, and the orthographic projections of the support units being overlapped with each other, thereby preventing the protective sheet from deforming when under pressure and enabling it to quickly recover from deformation. The support structure can prevent the protective sheet from "long-term adhesion" to the grating structure area or the non-structure area, thereby reducing the occurrence of Newton ring phenomenon, improving the display effect in the existing lens, and having unexpected technical effects; at the same time, considering the operability of the process and the frequency of pressure on the diffraction optical waveguide, the support units are arranged in abutment with each other, and the abutment heights of the support units at different positions are different, thereby reducing the process difficulties, while increasing the service life of the diffraction optical waveguide, and preventing the support units at higher heights from being damaged by pressure.

[0092] In another embodiment 9, the application provides a display lens of a diffractive light waveguide, as shown in FIG1 , comprising at least one waveguide sheet 130 and at least one protective sheet 110. The waveguide sheet 130 and the protective sheet 110 are stacked and connected by a connector 120. A grating structure is provided on the surface of the waveguide sheet 130 facing the protective sheet 110. The grating structure includes an in-coupling grating 150 and an out-coupling grating 140. The optical path area connected by the in-coupling grating 150 and the out-coupling grating 140 is defined as a grating structure area. A first magnetic coating 200 is provided on the surface of the protective sheet 110 facing the waveguide sheet 130. A second magnetic coating 300 is provided on the surface of the guide plate 130 facing the protective plate 110, and the projections of the first magnetic coating 200 and the second magnetic coating 300 at least partially overlap with each other. The first magnetic coating 200 is provided in the orthographic projection area of ​​the grating structure on the protective plate 110 and extends outside the orthographic projection area. Exemplarily, the projections of the first magnetic coating 200 and the second magnetic coating 300 on the waveguide plate 130 or the protective plate 110 overlap, so that they are opposite and correspondingly arranged on the upper and lower surfaces. The second magnetic coating 300 is configured to be arranged around the grating structure, and the magnetic properties of the first magnetic coating 200 are different from those of the second magnetic coating 300.

[0093] The first magnetic coating 200 and the second magnetic coating 300 are divided into several regions. The refractive index of the material of the first magnetic coating 200 and the second magnetic coating 300 located within the orthographic projection of the grating structure on the protective sheet 110 is greater than or equal to 2 and no less than the refractive index of the grating structure. The refractive index of the material of the first magnetic coating 200 and the second magnetic coating 300 located outside the orthographic projection is between 1.0 and 1.5 and is configured to not affect the propagation of light in the optical path. The particle size of the coating particles of the first magnetic coating 200 and the second magnetic coating 300 is configured to be smaller than the spacing between the teeth of the grating structure. Of course, the first magnetic coating 200 and the second magnetic coating 300, as a supporting structure, are disposed on at least one opposing surface of the waveguide sheet and the protective sheet.

[0094] Optionally, the surface of the support structure may be a non-smooth surface, and the position where the support structure is connected with the waveguide plate and the protection plate forms a non-smooth surface.

[0095] As shown in FIG12 , the first magnetic coating 200 is divided into a plurality of regions, such as A1, A2, A3, A4, A5 and other sub-regions; the second magnetic coating 300 is divided into a plurality of regions, such as B1, B2, B3, B4, B5 and other sub-regions; when the first magnetic coating 200 and the second magnetic coating 300 cover the grating structure, such as A2, A4, B2, B4 in FIG10 , the orthographic projection of the sub-region covers the grating structure. In order to consider the effect of the coating setting on the total reflection of the light in the waveguide, under the premise of how to ensure the display effect of the diffraction light waveguide, the refractive index of different regions is limited. The refractive index of the first and second magnetic coatings 200 and 300 located within the orthographic projection area is adjusted to improve display uniformity and brightness, ensuring visual imaging quality within the eyebox. For example, the refractive index of the material of the first and second magnetic coatings 200 and 300 within the orthographic projection area is greater than or equal to 2 and no less than the refractive index of the grating structure, namely, sub-regions A2, A4, B2, and B4. The refractive index of the material of the first and second magnetic coatings 200 and 300 located outside the orthographic projection area is between 1.0 and 1.5 and is configured so as not to affect the propagation of light in the optical path, such as sub-regions A1, A3, A5; B1, B3, B5, etc., to prevent light crosstalk within the waveguide. It will be appreciated that FIG10 is merely an example. Of course, limiting the number or area of ​​sub-regions of the first and second magnetic coatings 200 and 300, as well as the area of ​​the orthographic projection area, based on the area of ​​the grating structure, is within the scope of the protection scheme of this application, based on the concepts of the present invention.

[0096] 12 , optionally, the second magnetic coating 300 is configured to surround the grating structure, or alternatively, the second magnetic coating may cover the grating structure region, or the first magnetic coating may partially or fully cover the surface of the protective sheet 10 facing the waveguide sheet.

[0097] In this embodiment, two magnetic coatings with different magnetic properties are provided. Due to the mutual repulsion between the coatings, when the protective sheet 110 is compressed and bent and deformed, the repulsive force between the coatings can repel each other, thereby restoring the cover plate to its original state, changing the contact mode between the cover plate and the waveguide plate, and effectively preventing the occurrence of Newton rings. At the same time, based on the uniformity, diffraction efficiency, and uniformity requirements within the eyebox, the zoning of different coatings in different areas is controlled, the grating structure area and the non-structure area are partitioned and the refractive index of the coatings in different areas is limited. Such a structural design has unexpected technical effects.

[0098] Furthermore, the first magnetic coating 200 and the second magnetic coating 300 are divided into multiple regions, each with a different refractive index. In particular, the refractive indices of the coatings projected from the inner and outer sides of the grating structure region are different. On the one hand, the present invention changes the contact form between the existing grating region and the cover plate to avoid the Newton ring phenomenon. On the other hand, considering the effect of the coating setting on the total internal reflection of light in the waveguide, while ensuring the display effect of the diffraction light waveguide, the refractive index of different regions is limited to improve the display uniformity and brightness, thereby ensuring the visual imaging effect within the eyebox.

[0099] Further, in conjunction with Figure 13, the first magnetic coating 200 and the second magnetic coating 300 are staggered with each other, and only the projections of the two overlap, or partially overlap. Through such an arrangement, free space is provided for the area where the coating is set on the waveguide plate 30 and the protective plate 110. Those skilled in the art can determine the area and position for setting the coating according to the difficulty of the process. At the same time, a certain space is reserved for the subsequent setting of the connector 20 on one side of the waveguide, which is convenient for the subsequent waveguide connection and blackening setting. Without departing from the concept of this application, all of these fall within the scope of protection of this application.

[0100] Of course, the areas of the first magnetic coating 200 and the second magnetic coating 300 are different, and it can be defined that the first magnetic coating 200 is larger than the area of ​​the second magnetic coating 300, and the projection of the first magnetic coating is located within the projection area of ​​the second magnetic coating, or alternatively, it can be defined that the first magnetic coating 200 is smaller than the area of ​​the second magnetic coating 300, and the projection of the second magnetic coating is located within the projection area of ​​the first magnetic coating; by adjusting the area sizes of different coatings, the complexity of the process, especially the coating process, or in order to reduce the coating material, save costs and other factors are comprehensively considered.

[0101] The thickness of the first magnetic coating 200 is further limited to be smaller than that of the second magnetic coating 300. By limiting the thickness of the second magnetic coating 300 to withstand external pressure, the cover plate can effectively alleviate the greater pressure during the compression process, have a stronger pressure-bearing capacity, and quickly recover from deformation, effectively reducing the Newton ring phenomenon. Furthermore, during the contact between the cover plate and the second magnetic coating, the cover plate can preferentially contact the second magnetic coating rather than the grating structure. This effectively reduces contact between the cover plate and the grating structure, prevents the cover plate from compressing and damaging the grating structure in the waveguide, and improves the service life of the diffraction waveguide. The first magnetic coating 200 fully covers the surface of the protective sheet 110 facing the waveguide sheet 130. Optionally, the first magnetic coating 200 can be a light-transmitting magnetic material, such as a transparent magnetic material, to further enhance the mutual repulsion between the first magnetic coating and the second magnetic coating.

[0102] Practically, the first magnetic coating 200 and the second magnetic coating 300 are made of a light-transmitting magnetic material, such as iron oxide film, cadmium zinc germanium phosphide (CZGP), ferrite / zinc oxide (Fe3O4 / ZnO) nanocomposite material, silver chromate (AgCrO2), iron-cobalt alloy and insulating material aluminum fluoride mixed new material, etc.

[0103] To improve the imaging effect of the diffraction optical waveguide and prevent the coating from affecting the uniformity and brightness of the waveguide, the particle size range of the magnetic particles of the first magnetic coating 200 and the second magnetic coating 300 can be limited to 3 nm to 1.2 μm.

[0104] Furthermore, considering the size of the grating structure and the effect of the magnetic coating on the grating diffraction efficiency when provided, in order to prevent the adverse effects of larger coating particles on imaging, the particle size of the particles can be controlled to be smaller than the spacing between the teeth of the grating structure, such as limiting the particle size range of the particles to 3nm~300nm, or even, controlled to be within the range of 3nm~120nm, or 10nm~150nm, 10nm~200nm, or a smaller range such as 20nm~80nm.

[0105] Therefore, based on the principle of optical imaging, the particle size of the coating particles is required to be relatively high. The particle size of the particles is controlled to be smaller than the spacing between the teeth of the grating structure to prevent larger particles from producing additional optical effects on the light and introducing stray light that is not conducive to the imaging effect. It can be implemented by controlling the particle size to be below 300nm, or below 200nm, or even below 120nm, or below 80nm, to improve the uniformity and brightness of the light output.

[0106] Furthermore, the second magnetic material may be limited to have a higher refractive index, such as a refractive index greater than 2.3, to improve the diffraction effect. There is no requirement for the refractive index of the first magnetic material, as long as it meets the optical imaging conditions.

[0107] Practically, when the second magnetic coating 300 is configured to cover the grating structure, it can be optionally limited to include multiple first magnetic coating 200 areas on the surface of the protective sheet 110; or further, the first magnetic coating 200 fully covers the surface of the protective sheet 110, and the coating covers the entire surface of the protective sheet 110. Of course, the height of the second magnetic coating 300 can be determined based on the height of the grating structure. The height of the second magnetic coating 300 can be limited to be equal to or greater than the height of the grating structure, or the height of the second magnetic coating 300 can be much greater than the height of the grating structure. The relationship between the height of the first magnetic coating 200 and the height of the second magnetic coating 300 can be appropriately adjusted according to the actual Newton ring phenomenon, and is not limited in detail here.

[0108] A first magnetic coating 200 is provided on the surface of the protective sheet 110 facing the waveguide sheet 30, and a second magnetic coating 300 is provided on the surface of the waveguide sheet 30 facing the protective sheet 110. The projections of the first magnetic coating 200 and the second magnetic coating 300 at least partially overlap, and the second magnetic coating only covers the grating structure area. The second magnetic material has a relatively high refractive index, such as a refractive index greater than 2.3. The refractive index of the first magnetic material can be sufficient to meet the optical imaging conditions.

[0109] Furthermore, in Example 10, as shown in FIG14 , a display lens of a diffraction light waveguide is provided, comprising at least two waveguide sheets 30 and at least one protective sheet 110. The waveguide sheet 30 and the protective sheet 110 are stacked, and the waveguide sheet 30 and the protective sheet 110 are connected by a connector 20. A grating structure is provided on a surface of the waveguide sheet 30 facing the protective sheet 110. The grating structure comprises an in-coupling grating 50 and an out-coupling grating 40. The optical path area connected by the in-coupling grating 50 and the out-coupling grating 40 is defined as a grating structure area. A first magnetic coating 200 is provided on the surface of the protective sheet 110 facing the waveguide sheet 30, a second magnetic coating 300 is provided on the surface of the waveguide sheet 30 facing the protective sheet 110, and a first magnetic coating 200 is provided on the surface of the middle waveguide sheet facing the other waveguide sheet. The projections of the first magnetic coating 200 and the second magnetic coating 300 at least partially overlap, so that they are arranged opposite to each other on the upper and lower surfaces, and the magnetic properties of the first magnetic coating 200 are different from those of the second magnetic coating 300.

[0110] In this embodiment, the grating structure also includes a turning grating. In this case, the grating structure area is defined as the region of the optical path connected by the locations of the in-coupling grating, the turning grating, and the out-coupling grating. Of course, in other embodiments, the grating structure may also include other functional gratings, such as a recycling grating. In this case, the grating structure area is defined as the region of the grating structure and the region of the optical path connected by the locations of the gratings within the grating structure.

[0111] In this embodiment, a first magnetic coating and a second magnetic coating with different magnetic properties are creatively provided on the opposing surfaces between the waveguide and the protective sheet of the diffraction light waveguide. The mutual repulsion between the first magnetic coating and the second magnetic coating changes the contact mode between the protective sheet and the waveguide, so that when the protective sheet is deformed by external pressure, the repulsive force between the first magnetic coating and the second magnetic coating can restore the deformation to the original state, thereby reducing the Newton ring phenomenon, improving the display effect of the diffraction light waveguide, and improving the durability of use. Furthermore, the first magnetic coating and the second magnetic coating are divided into multiple regions, each of which has a different refractive index, especially the refractive index of the coating of the inner and outer orthographic projections of the grating structure region is different. On the one hand, the present invention changes the existing contact mode between the grating region and the protective sheet to avoid the Newton ring phenomenon, and on the other hand, considering the setting of the coating The impact of total internal reflection of light in the waveguide. Under the premise of how to ensure the display effect of the diffraction light waveguide, the refractive index of different areas is limited to improve the uniformity and brightness of the display, prevent the introduction of stray light, and ensure the visual imaging effect in the eyebox. At the same time, according to the difficulty and operability of the coating process, the position, area and thickness of the first magnetic coating and the second magnetic coating in the protective sheet and the waveguide are adjusted. At the same time, the particle size of the coating particles is controlled to be smaller than the spacing between the teeth of the grating structure to prevent larger particles from producing optical effects such as diffraction or reflection of light. The projection relationship between the first magnetic coating and the second magnetic coating and the refractive index relationship between the projection area of ​​the grating structure are limited to achieve a better display effect of the diffraction light waveguide, avoid stray light, improve the uniformity, brightness and diffraction efficiency of the eyebox, and minimize or avoid the occurrence of Newton rings.

[0112] In embodiment 11 of the present invention, a method for manufacturing a display lens is provided. As shown in FIG15 , 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 stacked. The method includes the following steps:

[0113] S1: a grating structure is provided on the surface of the waveguide plate 130 facing the protective plate 110 , wherein the grating structure includes an in-coupling grating 150 and an out-coupling grating 140 ;

[0114] S2: Disposing a support structure 210 on a surface of the protective sheet 110 facing the grating structure; the support structure 210 is disposed at least within the orthographic projection area of ​​the grating structure on the protective sheet; and the surface of the support structure close to the waveguide sheet is a non-smooth surface;

[0115] S3: Connect the waveguide plate and the protection plate through the connector 120 to form the display lens.

[0116] In step S1, the waveguide sheet and protective sheet are made of thin materials such as optical waveguide glass or resin sheets, and a grating structure is formed by etching or nanoimprinting techniques. The grating structure can be limited to one-dimensional gratings and / or two-dimensional gratings, and the structural shapes include straight teeth, helical teeth, blazed gratings, and combinations thereof.

[0117] In step S2, a support structure 210 is provided on the surface of the protective sheet 110 on the side facing the grating structure. The support structure can be formed by mold forming, printing, etching, nanoimprinting, etc., and the support structure is provided at least within the positive projection area of ​​the grating structure on the protective sheet.

[0118] The material of the support structure can include a curing adhesive and particles filled within the curing adhesive, as in the aforementioned embodiment; or, alternatively, a structure comprising a plurality of support units formed by curing the curing adhesive or etching the photoresist. When the support material includes curing adhesive and particles filled within the curing adhesive, the support structure can be formed on the protective sheet through molding, printing, or inkjet printing. The printing and inkjet printing parameters, such as area, time, and height, can be controlled to form a plurality of support units.

[0119] Furthermore, in step S2, when at least two optical waveguide sheets are included, a grating structure is provided on one side of each waveguide sheet, a support structure 210 is provided on a surface of the protective sheet 110 facing the grating structure, and a support structure 210 is provided on a surface of the middle waveguide sheet facing the other waveguide sheet, and the support structure 210 is provided at least within the orthographic projection area of ​​the grating structure of the waveguide sheet on the protective sheet.

[0120] The present application seeks protection for a display device comprising the display lens described in any one of the aforementioned embodiments.

[0121] 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 limited to be provided at least within the positive projection area of ​​the grating structure on the protective sheet, and the surface of the support structure close to the waveguide sheet is provided as a non-smooth surface, so that when the protective sheet and / or the waveguide sheet are deformed by pressure, the contact mode between the protective sheet and the waveguide sheet or between the waveguide sheets is changed, thereby avoiding large-area contact adhesion between the sheets and reducing the possibility of Newton ring phenomenon. Moreover, the contact mode between the sheets in the present application is also conducive to recovering deformation, avoiding long-term adhesion, further reducing the possibility of Newton ring phenomenon, improving the display effect in the existing lens, and having unexpected technical effects; optionally, the present invention also further limits the position and structure of the support structure, can change the contact mode between the sheets from different angles, improve the deformation recovery ability, and improve the performance of the display lens, which is a significant improvement.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display lens, characterized in that: The invention comprises at least one layer of waveguide sheet and at least one layer of protection sheet, wherein the waveguide sheet and the protection sheet are stacked, a grating structure is arranged on a surface of the waveguide sheet facing the protection sheet, the grating structure comprises an in-coupling grating and an out-coupling grating, a support structure is arranged on at least one surface opposite to the protection sheet and the waveguide sheet, the surface of the support structure is a non-smooth surface, and the support structure is configured not to affect the optical path of the waveguide sheet.

2. The display lens according to claim 1, characterized in that: A support structure is disposed on a surface of the protection sheet facing the grating structure, and the support structure is disposed at least within an orthographic projection region of the grating structure on the protection sheet.

3. The display lens according to claim 2, characterized in that: The support structure is arranged in the orthographic projection area of ​​the grating structure on the protection sheet and extends outside the orthographic projection area.

4. The display lens according to claim 2, characterized in that: The support structure includes curing glue and particles filled in the curing glue, and the particle size of the particles is greater than the height of the curing layer formed after the curing glue is cured.

5. The display lens according to claim 2, characterized in that: The support structure comprises a plurality of support units; the support units in the grating structure projection area and the connecting light path projection area have the same height.

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

7. The display lens according to claim 5, characterized in that: The heights of the support units in the grating structure projection area and the connecting light path projection area are different from the heights of the support units outside the grating structure projection area and the connecting light path projection area.

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

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

10. The display lens according to claim 2, characterized in that: The invention comprises at least two layers of waveguide plates and at least one layer of protection plate, wherein the waveguide plates and the protection plate are stacked, a grating structure is arranged on one side surface of each waveguide plate, the support structure is arranged on one side surface of the protection plate facing the grating structure, and the support structure is arranged on one side surface of a middle waveguide plate facing another waveguide plate, and the support structure is arranged at least within the positive projection area of ​​the grating structure of the waveguide plate within the protection plate.

11. The display lens according to claim 1, characterized in that: A grating structure region is formed by the region where the coupling-in grating and the coupling-out grating are located and the connected region; a support structure is arranged outside the grating structure region, and the support structure surrounds the grating structure region; and the cross section of the support structure is ring-shaped and / or dot-shaped.

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

13. The display lens according to claim 10, characterized in that: A first supporting structure is disposed on a surface of the waveguide sheet facing the protective sheet, and a second supporting structure is disposed on a surface of the protective sheet facing the waveguide sheet, wherein the first supporting structure surrounds the grating structure region; The first supporting structure on the surface of the waveguide sheet and the second supporting structure on the surface of the protection sheet abut against each other.

14. The display lens according to claim 12, characterized in that: The orthographic projections of the first supporting structure and the second supporting structure on the protection sheet or the waveguide sheet overlap with each other; the first supporting structure and the second supporting structure include a plurality of supporting units.

15. The display lens according to claim 1, characterized in that: The first supporting structure on the surface of the waveguide plate and the second supporting structure on the surface of the protection plate have different heights, and / or the first supporting structure on the surface of the waveguide plate and the second supporting structure on the surface of the protection plate have different widths.

16. A display lens, characterized in that: The invention comprises at least one waveguide sheet and at least one protective sheet, wherein the waveguide sheet and the protective sheet are stacked, a grating structure is arranged on the surface of the waveguide sheet facing the protective sheet, a first magnetic coating is arranged on the surface of the protective sheet facing the waveguide sheet, and a second magnetic coating is arranged on the surface of the waveguide sheet facing the protective sheet, the projections of the first magnetic coating and the second magnetic coating at least partially overlap, the first magnetic coating is arranged in the orthographic projection area of ​​the protective sheet and extends outside the orthographic projection area, and the magnetism of the first magnetic coating is different from that of the second magnetic coating. 17 . The display lens according to claim 16 , wherein the first magnetic coating and the second magnetic coating are divided into a plurality of regions.

18. The display lens according to claim 17, wherein the material refractive index of the first magnetic coating and the second magnetic coating within the orthographic projection area is greater than or equal to 2 and not less than the refractive index of the grating structure; the material refractive index of the first magnetic coating and the second magnetic coating outside the orthographic projection area is between 1.0 and 1.5, and is configured not to affect the propagation of light in the optical path. 19 . The display lens according to claim 16 , wherein the particle sizes of the coating particles of the first magnetic coating layer and the second magnetic coating layer are configured to be smaller than the interval between the teeth of the grating structure.

20. The display lens according to claim 16, wherein the second magnetic coating is configured to surround the grating structure, or the second magnetic coating is configured to cover the grating structure.

Images