Full-lamination structure, optical control sheet and method for forming full-lamination structure

Abstract

The invention discloses a full-lamination structure, an optical control sheet and a method for forming the full-lamination structure. The full-lamination structure comprises an optical control sheet and an attached object. The optical control sheet includes a substrate, a plurality of optical microstructures, and an optical adhesive layer. The optical microstructures are directly disposed on the substrate. The optical adhesive layer is disposed on the substrate and the optical microstructures and covers the optical microstructures. The attaching object is arranged on the optical adhesive layer and is attached to the substrate and the optical microstructures through the optical adhesive layer. The attaching object is provided with a plurality of grooves on one side of the optical adhesive layer, and at least one of the grooves is internally provided with a part of the optical adhesive layer and air. According to the full-lamination structure, an air gap can be kept between the optical adhesive layer and the attached object, so that the optical function of the attached object can still be maintained when the attached object is tightly laminated with the optical control sheet.

Description

Technical Field

[0001] The present invention relates to full bonding technology, and in particular to a full bonding structure for fully bonding a substrate to an attached object with optical functions, an optical control sheet with optical functions that can be attached to the attached object, and a method for forming the full bonding structure. Background Art

[0002] For example, optical components such as light guide plates, prism sheets, and diffusers can have a cover plate, such as protective glass, attached to their surfaces before use to protect their structures. Currently, one way to attach the cover plate to the optical component is to apply optical glue to the periphery of the optical component and attach the cover plate to the optical component in a periphery frame-attached manner. However, this bonding method cannot allow the cover plate to be completely attached to the optical component. When the optical component or the cover plate is squeezed by external force, the deformation of the two is inconsistent and it is easy to affect the function of the optical component. Another bonding method is to apply optical glue to the entire surface of the optical component and attach the cover plate to the optical component in a fully attached manner. Although this method allows the cover plate to be completely attached to the optical component, the refractive index difference between the optical glue and the optical component is not large. When the optical glue completely covers the surface structure of the optical component, the optical component loses the optical function originally preset to be generated by the large refractive index difference with the air. Summary of the invention

[0003] The object of the present invention is to provide a fully laminated structure, an optical control sheet and a method for forming the fully laminated structure, which can retain air between the optical adhesive layer and the attached object so that the attached object can maintain its optical function.

[0004] According to the above purpose, the present invention provides a fully bonded structure, which includes a substrate, a plurality of optical microstructures, an optical adhesive layer and an attached object. These optical microstructures are directly disposed on the substrate. The optical adhesive layer is disposed on the substrate and these optical microstructures, and covers these optical microstructures. The attached object is disposed on the optical adhesive layer, and the substrate and these optical microstructures are bonded through the optical adhesive layer. The attached object has a plurality of grooves on one side of the optical adhesive layer, and at least one of these grooves has a portion of the optical adhesive layer and air.

[0005] According to an embodiment of the present invention, the refractive index of each of the optical microstructures is greater than the refractive index of the optical adhesive layer by at least 0.01.

[0006] According to an embodiment of the present invention, the ratio of the height of each of the optical microstructures to the height of the optical adhesive layer is 0.5-1.

[0007] According to an embodiment of the present invention, the height and width of each of the optical microstructures are 0.5 micrometers to 100 micrometers.

[0008] According to an embodiment of the present invention, in the vertical projection direction of the fully-fitted structure, the grooves and the optical microstructures are arranged in a staggered manner.

[0009] According to an embodiment of the present invention, a width of a protruding plane between two adjacent grooves among the grooves is greater than a width of a gap between two adjacent optical microstructures among the optical microstructures.

[0010] According to the above purpose, the present invention provides an optical control sheet, which includes a substrate, a plurality of optical microstructures and an optical adhesive layer. The substrate has a first surface. The optical microstructures are disposed on the first surface. The optical adhesive layer is disposed on the first surface and the optical microstructures. The optical adhesive layer covers the optical microstructures and has a second surface, wherein the second surface is a plane, and the distance from the first surface to the second surface is a constant value.

[0011] According to the above-mentioned purpose, the present invention proposes a method for forming a fully-bonded structure, which method includes: directly setting a plurality of optical microstructures on the first surface of a substrate; coating an optical adhesive layer on the substrate and these optical microstructures, the optical adhesive layer covering and exceeding the top surface of each of these optical microstructures; flattening the optical adhesive layer so that the optical adhesive layer has a second surface, wherein the second surface is a plane, and the distance from the first surface to the second surface is a constant; and setting an attachment on the second surface so that the attachment is bonded to the substrate and these optical microstructures through the optical adhesive layer, wherein the attachment has a plurality of grooves on one side of the optical adhesive layer, and at least one of these grooves contains a portion of the optical adhesive layer and air.

[0012] According to another embodiment of the present invention, the height and width of each of the optical microstructures are 0.5 micrometers to 100 micrometers, and the ratio of the height of each of the optical microstructures to the height of the optical adhesive layer is 0.5-1.

[0013] According to another embodiment of the present invention, the refractive index of each of the optical microstructures is greater than the refractive index of the optical adhesive layer by at least 0.01.

[0014] The advantage of the present invention is at least that an air gap can be maintained between the optical adhesive layer and the attached object, so that the attached object can maintain its optical function. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] For a more complete understanding of the embodiments and their advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which:

[0016] Figure 1 is a cross-sectional schematic diagram of a fully laminated structure according to some embodiments of the present invention;

[0017] Figure 2A and Figure 2BThey are plan views of optical microstructures according to different examples;

[0018] Figure 3 Schematic cross-sectional view of a fully laminated structure according to some other embodiments of the present invention;

[0019] Figure 4 Schematic cross-sectional view of a fully laminated structure according to some other embodiments of the present invention;

[0020] Figure 5 Schematic cross-sectional view of a fully laminated structure according to some other embodiments of the present invention;

[0021] 6A to 6F Schematic cross-sectional views of various stages of a method for forming a fully bonded structure according to some embodiments of the present invention.

[0022]

Explanation of symbols

[0023] 100,300,400,500: Fully laminated structure

[0024] 110,310,410,510: Optical control sheet

[0025] 111,311,411,511:Substrate

[0026] 111A,411A:Surface

[0027] 112,312,412,512: Optical microstructures

[0028] 112A,312A,512A: Bottom

[0029] 112B,312B,512B: Side

[0030] 112C,312C,412C,512C: Top

[0031] 113,313,413,513: Optical adhesive layer

[0032] 113A,413A:Surface

[0033] 120,320,420,520: Attachments

[0034] 421: Groove

[0035] 422: Raised structure

[0036] 422A: Top surface

[0037] H1,H2: Height

[0038] OSL: Optical Structure Layer

[0039] W1,W2: Width

[0040] α: Angle DETAILED DESCRIPTION

[0041] The following is a detailed discussion of the embodiments of the present invention. However, it is to be understood that the embodiments provide many applicable concepts that can be implemented in a variety of specific contexts. The embodiments discussed and disclosed are for illustration only and are not intended to limit the scope of the present invention.

[0042] The terms used in this document are only for describing particular embodiments and are not intended to limit the claims. Unless otherwise limited, the singular forms "a", "an" or "the" may also be used to refer to the plural forms.

[0043] It is to be understood that, although the terms “first”, “second”, etc. may be used herein to describe various features, these terms should not limit these features. These terms are only used to distinguish one feature from another.

[0044] The use of spatially relative terms is intended to describe different orientations of an element when in use or operation and is not limited to the orientation depicted in the drawings. The element may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptions used herein may be interpreted in the same manner.

[0045] For simplicity and clarity of description, reference numerals and / or letters may be repeated in various embodiments herein, but this does not imply a causal relationship between the various embodiments and / or configurations discussed.

[0046] In addition, to simplify the drawings, some conventional structures and elements in the art will be depicted in a simple schematic manner in the drawings, or will not appear in the drawings, and the actual size and proportion of each element in this document are not limited to those depicted in the drawings.

[0047] Figure 1 FIG. 1 is a cross-sectional schematic diagram of a fully bonded structure 100 according to some embodiments of the present invention. Figure 1 As shown, the fully bonded structure 100 includes an optical control sheet 110 and an attached object 120. The optical control sheet 110 can be bonded to the surface of the attached object 120 to protect the attached object 120 without affecting the optical function or display function of the attached object 120. The optical control sheet 110 includes a substrate 111, a plurality of optical microstructures 112, and an optical adhesive layer 113.

[0048] The substrate 111 may be a hard substrate including, for example, optical glass, heat-resistant glass, quartz, ceramic, sapphire, polycarbonate (PC), polymethyl methacrylate (PMMA), a combination of the above materials, or other similar insulating materials, or a flexible substrate including, for example, polyimide (PI), polyethylene terephthalate (PET), a combination of the above materials, or other similar insulating materials, but is not limited thereto.

[0049] The optical microstructures 112 are directly disposed on the substrate 111, for example, directly contacting the surface 111A of the substrate 111. The material of the optical microstructures 112 can be the same as the material of the substrate 111, or different from the material of the substrate 111, wherein the material of the optical microstructures 112 can include, for example, polyurethane (PU), polymethyl methacrylate, silicon, silicate glass, boron glass, a combination of the above materials, or other similar hard materials. The optical microstructures 112 can be used to change the direction of light travel, gather light, and / or diffuse light.

[0050] Each of these optical microstructures 112 includes a bottom surface 112A, a side edge 112B, and a top surface 112C, wherein the bottom surface 112A is in direct contact with the substrate 111, the top surface 112C is away from the substrate 111, and the side edge 112B connects the bottom surface 112A and the top surface 112C. The height of each optical microstructure 112 is 0.5 micrometers to 100 micrometers, and / or the width of each optical microstructure 112 is 0.5 micrometers to 100 micrometers.

[0051] The optical adhesive layer 113 is disposed on the substrate 111 and the optical microstructures 112, and covers the optical microstructures 112. The optical adhesive layer 113 may be a transparent soft adhesive material, and its material may include, for example, polyurethane, polymethyl methacrylate, silicon or other similar transparent soft materials. The optical adhesive layer 113 has a substantially planar surface 113A to facilitate full bonding with the attached object 120. The optical adhesive layer 113 fills the gaps between the optical microstructures 112, and the optical adhesive layer 113 has a substantially planar surface 113A, and the distance from the surface 111A of the substrate 111 to the surface 113A of the optical adhesive layer 113 is a constant value (i.e., at each location of the fully bonded structure 100, the interval between the surface 111A of the substrate 111 and the surface 113A of the optical adhesive layer 113 is consistent), to facilitate full bonding with the attached object 120. The optical adhesive layer 113 maintains a uniform thickness through the support of the optical microstructures 112 .

[0052] In some other embodiments, the optical adhesive layer 113 covers the side edges 112B of the optical microstructures 112 and fills the gaps between the optical microstructures 112 without exceeding the optical microstructures 112. In other words, the surface 113A of the optical adhesive layer 113 is flush with the top surfaces 112C of the optical microstructures 112.

[0053] The refractive index of each optical microstructure 112 is greater than the refractive index of the optical adhesive layer 113 by more than 0.01. In addition, the ratio of the height H2 of each optical microstructure 112 to the height H1 of the optical adhesive layer 113 is 0.5 to 1. For example, when the height H1 of the optical adhesive layer 113 is the same as the height H2 of each optical microstructure 112, the ratio of the height H2 to the height H1 is 1. When the height H1 of the optical adhesive layer 113 is greater than the height H2 of each optical microstructure 112, the ratio of the height H2 to the height H1 is greater than or equal to 0.5 and less than 1. For example, if the height H2 of each optical microstructure 112 is 1 micrometer and the height H1 of the optical adhesive layer 113 is 2 micrometers, the ratio of the height H2 to the height H1 is 0.5; if the height H2 of each optical microstructure 112 is 100 micrometers and the height H1 of the optical adhesive layer 113 is 101 micrometers, the ratio of the height H2 to the height H1 is 0.99.

[0054] The attached object 120 is disposed on the optical adhesive layer 113, and is attached to the substrate 111 and the optical microstructures 112 through the optical adhesive layer 113. The attached object 120 is a plane on one side of the optical adhesive layer 113, and can be, for example, a polarizer, a display panel (such as a liquid crystal display panel, an organic light emitting diode display panel, a micro light emitting diode display panel, etc., but not limited thereto) or a similar optical or display element.

[0055] Furthermore, the planar pattern of each optical microstructure 112 (the pattern of the bottom surface 112A and / or the top surface 112C) can be circular, rectangular, elliptical, straight stripe, or curved stripe, etc., without limitation. Figure 2A and Figure 2B 1 and 2 are plan views of the optical microstructure 112 according to different examples. Figure 2A As shown, the planar pattern of each optical microstructure 112 is circular, while in other embodiments, such as Figure 2B As shown, the planar pattern of each optical microstructure 112 is a curved stripe shape. These optical microstructures 112 can be arranged on the substrate 111 at equal intervals, or randomly and non-equidistantly, without limitation. Figure 2A and Figure 2BIn the example of FIG. 1 , the optical microstructures 112 have the same planar pattern and are arranged equidistantly on the substrate 111. Through various structural and arrangement changes of the optical microstructures 112, light in various directions or specific directions can be guided to achieve the effect of changing the direction of light travel, concentrating light, and / or diffusing light.

[0056] In addition, the vertical cross-sectional pattern of each optical microstructure 112 can be rectangular or trapezoidal without limitation. Figure 1 As shown, the vertical cross-sectional pattern of each optical microstructure 112 is a rectangle, and the angle α formed by the bottom surface 112A and the side edge 112B of each optical microstructure 112 is equal to about 90 degrees.

[0057] Figure 3 3 is a cross-sectional schematic diagram of a fully bonded structure 300 according to some other embodiments of the present invention. The fully bonded structure 300 comprises an optical control sheet 310 and an attached object 320. The optical control sheet 310 comprises a substrate 311, a plurality of optical microstructures 312 and an optical adhesive layer 313. The substrate 311, the optical adhesive layer 313 and the attached object 320 are respectively similar to Figure 1 The optical microstructure 312 may be made of a substrate 111, an optical adhesive layer 113 and an attached object 120. Figure 1 The material of the optical microstructure 112 includes, for example, polyurethane, polymethyl methacrylate, silicon, silicate glass, borosilicate glass, a combination of the above materials, or other similar hard materials. In particular, the vertical cross-sectional pattern of each optical microstructure 312 is an inverted trapezoid, and in each optical microstructure 312, the width of the bottom surface 312A is greater than the width of the top surface 312C, and the angle α formed by the bottom surface 312A and the side edge 312B is greater than or equal to 30 degrees and less than 90 degrees.

[0058] In some other embodiments, the vertical cross-sectional pattern of each optical microstructure 312 is a trapezoid, and the angle α formed by the bottom surface 312A and the side edge 312B of each optical microstructure 312 is greater than 90 degrees and less than or equal to 150 degrees. These optical microstructures 312 can guide light in various directions or in a specific direction through structural changes to achieve the effects of changing the direction of light travel, concentrating light, and / or diffusing light.

[0059] Figure 4 4 is a cross-sectional schematic diagram of a fully bonded structure 400 according to some other embodiments of the present invention. The fully bonded structure 400 comprises an optical control sheet 410 and an attached object 420, wherein the optical control sheet 410 comprises a substrate 411, a plurality of optical microstructures 412 and an optical adhesive layer 413. The optical control sheet 410, the substrate 411, the optical microstructures 412 and the optical adhesive layer 413 are respectively similar to Figure 1The optical control sheet 110, substrate 111, optical microstructures 112 and optical adhesive layer 113 are shown in FIG. In particular, the attached object 420 may be (or may include) a light guide plate, a prism sheet, a diffusion sheet or similar optical elements, and has a plurality of grooves 421 on one side of the optical adhesive layer 413. When the attached object 420 is attached to the substrate 411 and the optical microstructures 412 through the optical adhesive layer 413, at least one of the grooves 421 contains a portion of the optical adhesive layer 413 and / or air.

[0060] Furthermore, the width of the raised plane between two adjacent grooves 421 in these grooves 421 (i.e., the width W1 of the top surface 422A of the raised structure 422) is greater than the width W2 of the gap between two adjacent optical microstructures 412 in these optical microstructures 412. Therefore, when the attached object 420 is bonded to the optical control sheet 410, the raised structure 422 between two adjacent grooves 421 will not sink into the gap between two adjacent optical microstructures 412, so that there is still an air gap when the attached object 420 is bonded to the optical control sheet 410 and the original optical function is retained. In addition, there is no need for special alignment when the attached object 420 is bonded to the optical control sheet 410. In some embodiments, in the vertical projection direction of the fully bonded structure 400, these grooves 421 and these optical microstructures 412 are staggered.

[0061] Figure 5 Schematic cross-sectional view of a fully bonded structure 500 according to some other embodiments of the present invention. The fully bonded structure 500 comprises an optical control sheet 510 and an attached object 520, wherein the optical control sheet 510 comprises a substrate 511, a plurality of optical microstructures 512 and an optical adhesive layer 513. The substrate 511, the optical adhesive layer 513 and the attached object 520 are respectively similar to Figure 4 The optical microstructure 512 may be made of a substrate 411, an optical adhesive layer 413 and an attachment 420. Figure 4 The material of the optical microstructure 412 includes, for example, polyurethane, polymethyl methacrylate, silicon, silicate glass, boron glass, a combination of the above materials, or other similar hard materials. In particular, the vertical cross-sectional pattern of each optical microstructure 512 is similar to Figure 3The vertical cross-sectional pattern of the optical microstructure 312 is, for example, an inverted trapezoid. In each optical microstructure 512, the width of the bottom surface 512A is greater than the width of the top surface 512C, and the angle α formed by the bottom surface 512A and the side 512B is greater than or equal to 30 degrees and less than 90 degrees. In some other embodiments, the vertical cross-sectional pattern of each optical microstructure 512 is a trapezoid, and in each optical microstructure 512, the width of the bottom surface 512A is less than the width of the top surface 512C, and the angle α formed by the bottom surface 512A and the side 512B is greater than 90 degrees and less than or equal to 150 degrees. These optical microstructures 512 can guide light in various directions or in a particular direction through structural changes to achieve the effect of changing the direction of light travel, concentrating light, and / or diffusing light.

[0062] 6A to 6F The following is a schematic cross-sectional view of various stages in a method for forming a fully laminated structure according to some embodiments of the present invention. The following method for forming a fully laminated structure takes the formation of a fully laminated structure 400 as an example, but those skilled in the art can also apply the method for forming a fully laminated structure to the fully laminated structures 100, 300 and 500 or other similar fully laminated structures according to the following description.

[0063] First, if Fig. 6A As shown, a substrate 411 is provided, wherein the material of the substrate 411 can be a hard substrate or a flexible substrate of an insulating material.

[0064] Then, if Figure 6B As shown, an optical structure layer OSL is directly disposed on the surface 411A of the substrate 411, wherein the material of the optical structure layer OSL may be the same as or different from the material of the substrate 411. The material of the optical structure layer OSL may include, for example, polyurethane, polymethyl methacrylate, silicon, silicate glass, boron glass, a combination of the above materials, or other similar hard materials.

[0065] Afterwards, if Figure 6C As shown, a plurality of optical microstructures 412 are formed on the surface 411A of the substrate 411 by performing a thermal transfer process, an ultraviolet embossing process, an etching process or other similar processes on the optical structure layer OSL. Further, the formed optical microstructures 412 are sculpted by performing a machining process, a laser process or other similar processes. The height of each formed optical microstructure 412 is 0.5 micrometers to 100 micrometers, and / or the width of each optical microstructure 112 is 0.5 micrometers to 100 micrometers.

[0066] Then, if Fig.6DAs shown, an optical adhesive layer 413 is coated on the surface 411A of the substrate 411 and the optical microstructures 412, wherein the optical adhesive layer 413 fills the gaps between the optical microstructures 412, covers and exceeds the top surface 412C of each of the optical microstructures 412. After the coating of the optical adhesive layer 413 is completed, the optical adhesive layer 413 is then flattened so that the surface 413A of the optical adhesive layer 413 is a plane. The step of coating the optical adhesive layer 413 can be performed in a vacuum environment to ensure that the optical adhesive layer 413 uniformly fills the gaps between the optical microstructures 412, and the distance from the surface 411A of the substrate 411 to the surface 413A of the optical adhesive layer 413 is a constant value (i.e., the interval between the surface 411A of the substrate 411 and the surface 413A of the optical adhesive layer 413 is consistent at each location of the fully bonded structure 400). The ratio of the height of each optical microstructure 412 to the height of the optical adhesive layer 413 is 0.5 to 1. In addition, the refractive index of each optical microstructure 412 is greater than the refractive index of the optical adhesive layer by more than 0.01.

[0067] In other embodiments, the optical adhesive layer 413 may be coated on the surface 411A of the substrate 411 to fill the gaps between the optical microstructures 412 , and then the optical adhesive layer 413 may be flattened so that the surface 413A of the optical adhesive layer 413 is flush with the top surfaces 412C of the optical microstructures 412 .

[0068] Afterwards, if Fig. 6E As shown, an attachment 420 is provided on the optical adhesive layer 413 , and a side of the attachment 420 having a plurality of grooves 421 faces a surface 413A of the optical adhesive layer 413 .

[0069] Then, if Fig. 6F As shown, at least one of the attachment 420 and the optical control sheet 410 is pressurized so that the attachment 420 is adhered to the substrate 411 and these optical microstructures 412 through the optical adhesive layer 413, wherein the optical adhesive layer 413 can be adhered between the substrate 411, these optical microstructures 412 and the attachment 420 by a direct bonding process, an ultraviolet light bonding process or a thermal bonding process.

[0070] In summary, by having the optical adhesive layer with a flat surface and / or the attached object with a groove, an air gap is maintained between the optical adhesive layer and the attached object, so that the attached object can still maintain its optical function when it is fully attached to the optical control sheet. Furthermore, by using the material, shape and arrangement of the optical microstructure to guide light in various directions or in a special direction, the effect of changing the direction of light, concentrating light, and / or diffusing light can be achieved, thereby assisting the attached object in maintaining its optical function. In addition, there is no need for special alignment when attaching the attached object to the optical control sheet, which is also conducive to simplifying the bonding process.

[0071] Although the present disclosure has been disclosed as above by way of embodiments, it is not intended to limit the present disclosure. Any person having ordinary knowledge in the technical field may make slight changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be determined by the definition of the attached claims.

Claims

1. A fully fitted structure, characterized in that: Include: a substrate; A plurality of optical microstructures are directly disposed on the substrate; an optical adhesive layer, disposed on the substrate and the plurality of optical microstructures, the optical adhesive layer covering the plurality of optical microstructures; as well as An attached object is disposed on the optical adhesive layer and adheres the substrate and the multiple optical microstructures through the optical adhesive layer. The attached object has multiple grooves on one side of the optical adhesive layer, and at least one of the multiple grooves contains a portion of the optical adhesive layer and air.

2. The fully fitted structure according to claim 1, characterized in that: The refractive index of each of the plurality of optical microstructures is greater than the refractive index of the optical adhesive layer by at least 0.

01.

3. The fully fitted structure according to claim 1, characterized in that: A ratio of a height of each of the plurality of optical microstructures to a height of the optical adhesive layer is 0.5 to 1.

4. The fully fitted structure according to claim 1, characterized in that: The height and width of each of the plurality of optical microstructures are 0.5 micrometers to 100 micrometers.

5. The fully fitted structure according to claim 1, characterized in that: In a vertical projection direction of the fully-fitted structure, the plurality of grooves and the plurality of optical microstructures are arranged in a staggered manner.

6. The fully fitted structure according to claim 1, characterized in that: A width of a protruding plane between two adjacent grooves among the plurality of grooves is greater than a width of a gap between two adjacent optical microstructures among the plurality of optical microstructures.

7. An optical control sheet, characterized in that: Include: A substrate having a first surface; a plurality of optical microstructures disposed on the first surface; and An optical adhesive layer is disposed on the first surface and the plurality of optical microstructures. The optical adhesive layer covers the plurality of optical microstructures and has a second surface, wherein the second surface is a plane, and the distance from the first surface to the second surface is a certain value.

8. A method for forming a fully fitted structure, characterized in that: Include: Directly disposing a plurality of optical microstructures on a first surface of a substrate; Coating an optical adhesive layer on the substrate and the plurality of optical microstructures, wherein the optical adhesive layer covers and exceeds the top surface of each of the plurality of optical microstructures; Flattening the optical adhesive layer so that the optical adhesive layer has a second surface, wherein the second surface is a plane, and a distance from the first surface to the second surface is a certain value; and An attachment is disposed on the second surface so that the attachment is adhered to the substrate and the multiple optical microstructures through the optical adhesive layer, wherein the attachment has a plurality of grooves on one side of the optical adhesive layer, and at least one of the plurality of grooves contains a portion of the optical adhesive layer and air.

9. The method according to claim 8, characterized in that The height and width of each of the plurality of optical microstructures are both 0.5 micrometers to 100 micrometers, and the ratio of the height of each of the plurality of optical microstructures to the height of the optical adhesive layer is 0.5 to 1.

10. The method according to claim 8, characterized in that The refractive index of each of the plurality of optical microstructures is greater than the refractive index of the optical adhesive layer by at least 0.01.

Images