High-toughness and high-wear-resistance anti-reflection film

Abstract

The utility model discloses a high-toughness and high-wear-resistance anti-reflection film which comprises a substrate layer, a hard coating and an anti-reflection laminated layer which are sequentially arranged from bottom to top. The antireflection laminated layer is composed of 1-5 optical layers with different refractive indexes; the refractive indexes of the adjacent optical layers are different, and the first optical layer, the second optical layer and the third optical layer are sequentially arranged according to the progressive increase order of the refractive indexes; the antireflection laminated layer at least comprises a first optical layer, and at least one first optical layer is an organic material layer. The first optical layer is introduced as the organic material layer and the second optical layer, so that the toughness and the bending resistance of the anti-reflection film can be improved, and the service life is prolonged.

Description

Technical Field

[0001] This application relates to the field of optical thin films, and particularly to a high-toughness and high-wear-resistant antireflection film. Background Art

[0002] The antireflection film is a thin film technology used to reduce the reflection of light on the surface of materials. Its main function is to reduce or eliminate the reflected light on the optical surfaces such as lenses, prisms, and plane mirrors, thereby increasing the light transmission of these components and reducing the stray light of the system. The antireflection film is widely used in daily life, industry, astronomy, military, electronics and other fields, and has a broad market prospect.

[0003] The display screen is the most common application field of the antireflection film. With the rise and development of the folding screen technology, various manufacturers have higher and higher requirements for the high toughness and anti-bending performance of the antireflection film. The traditional wet antireflection film based on coating has poor wear resistance, while the dry antireflection film prepared by the physical method based on inorganic materials has good wear resistance, but due to the brittle nature of inorganic materials, it has poor bend resistance. After multiple bends, it will break due to the concentration of bending stress, affecting the use experience of the product. Summary of the Utility Model

[0004] To solve the problems existing in the above-mentioned prior art, this application provides a high-toughness and high-wear-resistant antireflection film, which has good toughness and anti-bending ability, and is more suitable for application scenarios such as folding screens than traditional antireflection films.

[0005] This application provides a high-toughness and high-wear-resistant antireflection film, which includes a base layer, a hard coating, and an antireflection stack arranged in sequence from bottom to top; the antireflection stack is composed of 1-5 optical layers with different refractive indexes; the refractive indexes between adjacent optical layers are different, and are sequentially set as the first optical layer, the second optical layer, and the third optical layer in the order of increasing refractive index; the antireflection stack contains at least one first optical layer, and at least one first optical layer is set as an organic material layer.

[0006] Preferably, the organic material layer includes a polytetrafluoroethylene layer, a polystyrene resin layer, a polyimide resin layer, a polycarbonate resin layer, a silicone layer, etc.

[0007] According to an embodiment of the present utility model, in the antireflection stack, the outermost layer facing away from the hard coating is set as the first optical layer.

[0008] According to an embodiment of the present utility model, the refractive index range of the first optical layer is 1.4-1.5.

[0009] According to an embodiment of the present utility model, both the second optical layer and the third optical layer are inorganic material layers.

[0010] According to an embodiment of the present utility model, the refractive index range of the second optical layer is 1.6 - 1.8.

[0011] Preferably, the second optical layer can be selected from oxide layers, nitride layers, oxynitride layers of metals such as Al, Ti, Si, Zr, Ca, Zn, etc., and a combination layer of two or more of them.

[0012] According to an embodiment of the present utility model, the refractive index range of the third optical layer is 1.8 - 2.3.

[0013] Preferably, the third optical layer can be selected from oxide layers, nitride layers, oxynitride layers of metals such as Al, Ti, Si, Zr, Zn, Nb, Ta, etc., and a combination of two or more of them.

[0014] According to an embodiment of the present utility model, the thickness of the antireflection stack is 20 - 600 nm.

[0015] Preferably, the thickness of the antireflection stack is further selected as 100 - 300 nm.

[0016] Preferably, the thickness of the first optical layer is 10 - 200 nm.

[0017] Preferably, the thickness of the base layer is 20 - 200 μm; the base layer is a transparent flexible material layer, and can be selected from various transparent flexible substrates well-known to those skilled in the art; most preferably, it is a thin film.

[0018] According to an embodiment of the present utility model, the thickness of the hard coating is 1 - 5 μm.

[0019] Specifically, the hard coating is a photocurable resin layer, and can be selected from, for example, epoxy resins, acrylic resins, polyurethane acrylate resins, vinyl ether resins, etc.

[0020] According to an embodiment of the present utility model, the high-toughness and high-wear-resistant antireflection film further includes an antifouling layer, and the antifouling layer is disposed on a side of the antireflection stack away from the hard coating.

[0021] According to an embodiment of the present utility model, the thickness of the antifouling layer is 5 - 30 nm.

[0022] Preferably, the thickness of the antifouling layer is 20 - 30 nm, and the antifouling layer is selected from a polymer layer containing at least one of fluorine, fluoroether, methyl, phenyl, and organosilane hydrophobic groups.

[0023] The beneficial effects of the present application are as follows:

[0024] The first optical layer introduces an organic material to improve the toughness and bending resistance of the overall film layer; a second optical layer is introduced as a refractive index transition layer between the first optical layer and the third optical layer to enhance the bonding force inside the antireflection laminate and further improve the bending resistance of the film material. Description of the Drawings

[0025] The present application will be further described in detail below in conjunction with the drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present application. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0026] Figure 1 It is a schematic diagram of one film layer structure of the high-toughness and high-wear-resistant antireflection film disclosed in the specific embodiment of the present application;

[0027] Figure 2 It is a schematic diagram of the second film layer structure of the high-toughness and high-wear-resistant antireflection film disclosed in the specific embodiment of the present application.

[0028] In the figure: 1, base layer; 2, hard coating; 3, antireflection laminate; 4, antifouling layer. Detailed Description of the Preferred Embodiments

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0032] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0033] Please refer to Figure 1As shown, the present application provides a high-toughness and high-wear-resistant antireflection film. The high-toughness and high-wear-resistant antireflection film includes a base layer 1, a hard coating 2, and an antireflection stack 3 arranged in sequence from bottom to top. The antireflection stack 3 is composed of an alternating arrangement of a first optical layer, a second optical layer, and a third optical layer. The refractive index of the first optical layer is less than that of the second optical layer, and the refractive index of the second optical layer is less than that of the third optical layer. The total number of optical layers in the antireflection stack 3 is 1 - 5 layers. Among the first optical layer, the second optical layer, and the third optical layer, the same optical layers are not adjacent, that is, the refractive indices between adjacent optical layers are all set to be different from each other. At least one first optical layer is included in the antireflection stack 3, and at least one of the first optical layers is set as an organic material layer; and in the antireflection stack 3, the outermost layer facing away from the hard coating 2 must be set as the first optical layer.

[0034] Specifically, taking examples to illustrate, the antireflection stack 3 can be set with at least the following stack structures from inside to outside:

[0035] The antireflection stack 3 can be a single first optical layer. At this time, the antireflection stack 3 is a single-layer low refractive index layer;

[0036] The antireflection stack 3 can be a second optical layer / first optical layer stack. At this time, the antireflection stack 3 is a medium refractive index / low refractive index double-layer structure;

[0037] The antireflection stack 3 can be a third optical layer / first optical layer stack. At this time, the antireflection stack 3 is a high refractive index / low refractive index double-layer structure;

[0038] The antireflection stack 3 can be a third optical layer / second optical layer / first optical layer stack. At this time, the antireflection stack 3 is a high refractive index / medium refractive index / low refractive index triple-layer structure;

[0039] The antireflection stack 3 can be a first optical layer / third optical layer / first optical layer stack. At this time, the antireflection stack 3 is a low refractive index / high refractive index / low refractive index triple-layer structure;

[0040] The antireflection stack 3 can also be a second optical layer / third optical layer / first optical layer stack. At this time, the antireflection stack 3 is a medium refractive index / high refractive index / low refractive index triple-layer structure;

[0041] The antireflection stack 3 can also be a third optical layer / second optical layer / first optical layer / third optical layer / first optical layer stack. At this time, the antireflection stack 3 is a high refractive index / medium refractive index / low refractive index / high refractive index / low refractive index five-layer structure.

[0042] It should be noted here that in this application, the inner layer refers to the layer orientation shown by the base layer 1, and the outer layer refers to the layer orientation shown by the antireflection stack 3.

[0043] Specifically, the total thickness of the antireflection stack 3 is 20 - 600 nm, more preferably 100 - 300 nm, and each layer in the antireflection stack 3 is deposited by magnetron sputtering process. The thickness of the first optical layer is set to 10 - 200 nm, and the refractive index of the first optical layer is taken from 1.4 - 1.5, which is a low refractive index material layer defined in the art. The low refractive index organic material can be selected from polytetrafluoroethylene, polystyrene resin, polyimide resin, polycarbonate resin, silicone, etc. Selecting the low refractive index material of the first optical layer as an organic material can, without affecting the transparency and reflectivity of the film material, utilize the specific molecular chain structure and aggregation mode of the organic material to enhance the toughness and anti-bending ability of the film material itself, so that it can better adapt to application scenarios such as folding screens and have a longer service life. The second optical layer and the third optical layer are both inorganic material layers. The thickness of the second optical layer is 5 - 200 nm, and the refractive index of the second optical layer is taken from 1.6 - 1.8, which is a medium refractive index material layer defined in the art. The medium refractive index inorganic material can be selected from oxides, nitrides, oxynitrides of metals such as Al, Ti, Si, Zr, Ca, Zn, or any combination of two or more of them. Introducing the second optical layer in the antireflection stack 3 can regulate the refractive index change of the film material in a step-by-step manner and increase the light transmission amount. And the introduction of the second optical layer can also eliminate the stress concentration between the first optical layer and the third optical layer, further release the stress between the film layers, and improve the mechanical properties of the film material. The thickness of the third optical layer is 5 - 200 nm, and the refractive index of the third optical layer is taken from 1.8 - 2.3, which is a high refractive index material layer defined in the art. The high refractive index inorganic material can be selected from oxides, nitrides, oxynitrides of metals such as Al, Ti, Si, Zr, Zn, Nb, Ta, and any combination of two or more of them. Setting the second optical layer and the third optical layer as inorganic material layers can improve the wear resistance of the film material.

[0044] Specifically, the base layer 1 is a transparent flexible material layer. The thickness of the base layer 1 is not the inventive point of this application and is not uniquely defined here. Those skilled in the art can select a base layer 1 with a suitable thickness according to the actual situation, and the most preferred is 20 - 200 μm. The transparent flexible material used for the base layer 1 is not limited here, and common transparent flexible materials in the art can all be used, such as PTFE film, PC film, PET film, PI film, TAC film, etc. The hard coating 2 is a photocurable resin layer, and the thickness can be selected from 1 - 5 μm. The photocurable resin can be selected from epoxy resins, acrylic resins, polyurethane acrylate resins, vinyl ether resins, etc., and is not limited here. The hard coating 2 is used to flatten the surface of the substrate, reduce the surface roughness of the base layer 1, and improve the bonding strength and light transmittance with the antireflection laminate 3. In this application, it is selected to directly purchase the base layer 1 pre-coated with the hard coating 2.

[0045] Please refer to Figure 2 As shown, this application also provides a highly tough and highly wear-resistant antireflection film. On the side of the antireflection laminate 3 facing away from the hard coating 2, a stain-proof layer 4 is further provided. The stain-proof layer 4 is made of a hydrophobic material and can prevent water droplets, oil stains, fingerprints, etc. from contaminating the antireflection film, improving the cleanliness of the antireflection film during use. In this application, the thickness of the stain-proof layer 4 is taken from 5 - 30 nm, and more preferably 20 - 30 nm, to improve the wear life of the stain-proof layer 4 and at the same time ensure the coating quality of the stain-proof layer 4. The stain-proof layer 4 is a polymer containing at least one of hydrophobic groups such as fluorine, fluoroether, methyl, phenyl, organosilane, etc.; for example, it can be polytetrafluoroethylene, fluorinated polyurethane, fluorinated polyacrylate, polymethyl methacrylate, polydimethylsiloxane, polystyrene, methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, methyltrimethoxy(ethoxy)silane, dimethyldimethoxy(ethoxy)silane, trimethylmethoxy(ethoxy)silane, phenyltrimethoxy(ethoxy)silane, perfluorooctyltrichlorosilane, perfluorooctyltrimethoxy(ethoxy)silane, etc. The stain-proof layer 4 can be prepared on the antireflection laminate 3 by existing technologies such as evaporation coating, coating, or chemical vapor deposition.

[0046] In the specific embodiments of this application, the material listing for the second optical layer and the third optical layer is not limited to the disclosed part, and any material with a refractive index within the disclosed range can be applied to the embodiments of this application; the material listing for the base layer 1, the hard coating 2, and the stain-proof layer 4 in the specific embodiments of this application is also not limited to the disclosed part, and any application material well-known to those skilled in the art can be applied to the embodiments of this field.

[0047] The above has introduced the present application in detail. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the present application and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A high-toughness, high-wear-resistant and anti-reflection film, characterized in that, It includes a base layer (1), a hard coating (2), and an antireflection stack (3) arranged successively from bottom to top; The antireflection stack (3) is composed of 1 - 5 optical layers with different refractive indices; the refractive indices between adjacent optical layers are different, and they are successively set as the first optical layer, the second optical layer, and the third optical layer in the order of increasing refractive index; The antireflection stack (3) includes at least one first optical layer, and at least one first optical layer is set as an organic material layer.

2. The highly tough, highly wear-resistant and antireflective film according to claim 1, wherein In the antireflection stack (3), the outermost layer facing away from the hard coating (2) is set as the first optical layer.

3. The highly tough, highly wear-resistant and antireflective film according to claim 2, characterized in that, The refractive index range of the first optical layer is 1.4 - 1.

5.

4. The highly tough, highly wear-resistant and antireflective film according to claim 3, characterized in that, Both the second optical layer and the third optical layer are inorganic material layers.

5. The highly tough, highly wear-resistant and antireflective film according to claim 4, characterized in that, The refractive index range of the second optical layer is 1.6 - 1.

8.

6. The highly tough, highly wear-resistant and anti-reflection film according to claim 5, characterized in that, The refractive index range of the third optical layer is 1.8 - 2.

3.

7. The high-toughness, high-wear-resistant and anti-reflection film according to claim 6, characterized in that, The thickness of the antireflection stack (3) is 20 - 600 nm.

8. The highly tough, highly wear-resistant and anti-reflective film according to claim 1, characterized in that, The thickness of the hard coating (2) is 1 - 5 μm.

9. The highly tough, highly wear-resistant and antireflective film according to claim 1, wherein It further includes an antifouling layer (4), and the antifouling layer (4) is arranged on the side of the antireflection stack (3) facing away from the hard coating (2).

10. The highly tough, highly wear-resistant and antireflective film according to claim 9, characterized in that, The thickness of the antifouling layer (4) is 5 - 30 nm.

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