Optical film, polarizing film, and display device

Abstract

The application discloses an optical film, a polarizer and a display device, the optical film comprising a substrate layer, a low-reflection layer on one side of the substrate layer, and a super-hydrophobic layer on the side of the low-reflection layer away from the substrate layer; wherein the material of the super-hydrophobic layer is a nano-zinc oxide cluster modified by an organic silane without fluorine element, the organic silane is selected from alkylsiloxane with 12 to 22 carbon atoms, and the surface energy of the super-hydrophobic layer is less than or equal to 20 mN / m. The application aims to provide a solution of the fluorine-free environmentally friendly optical film with super-hydrophobic and low-reflection performance.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to an optical film, a polarizer, and a display device. Background Technology

[0002] In recent years, optical products and electronic devices have become increasingly widespread. Low-reflection films, as important materials for improving optical performance, are widely used in mobile phone and tablet screens. They can effectively reduce ambient light reflection and enhance screen display clarity, allowing for clear viewing of screen content even in strong light. Furthermore, for touchscreens in mobile phones and tablets that require finger operation, the hydrophilicity of the surface makes them prone to attracting dust and moisture, affecting not only the device's appearance but also its light transmittance and display clarity. Therefore, researching a coating with superhydrophobic self-cleaning properties and excellent low-reflection performance is of great significance.

[0003] Currently, the most common method for preparing these coatings is to graft or blend fluorinated compounds with organic materials, such as per- and polyfluoroalkyl substances (PFAS) due to their ultra-low surface energy (10⁻¹² mJ / m²). 2 Fluorinated compounds (PFAS) have long dominated the market for superhydrophobic coatings due to their excellent antifouling, oil-repellent, and water-repellent properties. However, fluorinated compounds pose significant risks to biological systems and the environment, hindering the recycling of polarizers. Because PFAS are difficult to decompose in the environment, they can negatively impact ecosystems and human health, earning them the moniker of "perpetual chemicals." Global regulatory bodies, such as the EU's REACH regulation and the US Environmental Protection Agency's PFAS Action Plan, are now strictly limiting the use of PFAS, driving an urgent need for PFAS-free alternatives. Therefore, research into fluorine-free and environmentally friendly surface coatings is essential. Utility Model Content

[0004] This application provides an optical film, a polarizer, and a display device, aiming to provide a solution for an optical film that is fluorine-free, environmentally friendly, and has superhydrophobic and low-reflection properties.

[0005] To achieve the above objectives, according to a first aspect of this application, an optical film is provided, comprising:

[0006] Substrate layer;

[0007] A low-reflection layer is located on one side of the substrate layer; and

[0008] A superhydrophobic layer is located on the side of the low-reflection layer opposite to the substrate layer;

[0009] The superhydrophobic layer is made of a nano-zinc oxide cluster modified with an organosilane that does not contain fluorine. The organosilane is selected from alkylsiloxanes with 12 to 22 carbon atoms, and the surface energy of the superhydrophobic layer is less than or equal to 20 mN / m.

[0010] Optionally, the nano-zinc oxide cluster comprises multiple zinc oxide nanopillars.

[0011] Optionally, the zinc oxide nanopillars have a diameter greater than 0 and less than 100 nanometers, a height ranging from 0.5 micrometers to 2 micrometers, and a spacing between any two adjacent zinc oxide nanopillars ranging from 100 nanometers to 300 nanometers.

[0012] Optionally, the root mean square roughness of the superhydrophobic layer ranges from 50 nanometers to 200 nanometers; the water contact angle of the superhydrophobic layer is greater than or equal to 155°, and the roll-off angle is less than or equal to 5°.

[0013] Optionally, the material of the low-reflection layer is mesoporous silica or a mixed aerogel composed of titanium dioxide and silica; in the mixed aerogel, the mass ratio of titanium dioxide and silica ranges from 1:9 to 3:7.

[0014] Optionally, the refractive index of the low-reflection layer is in the range of 1.2 to 1.3, the pore size of the mesoporous silica or the mixed aerogel is in the range of 2 nanometers to 50 nanometers, and the porosity of the low-reflection layer is in the range of 70% to 85%.

[0015] Optionally, the voids in the low-reflectivity layer are filled with air.

[0016] Optionally, the optical film has a reflectivity of less than or equal to 1.0% for light with wavelengths in the range of 400 nm to 700 nm.

[0017] According to a second aspect of this application, a polarizer is also provided, the polarizer comprising a polarizing functional layer and the optical film described above, the optical film being located on one side of the polarizing functional layer.

[0018] According to a third aspect of this application, a display device is also provided, the display device comprising a display panel and the polarizer described above, the polarizer being located on the light-emitting side of the display panel, and the optical film being located on the side of the polarizing functional layer opposite to the display panel; or, the display device comprising the display panel and the optical film described above, and the optical film being located on the light-emitting side of the display panel.

[0019] The optical film, polarizer, and display device provided in this application consist of a substrate layer, a low-reflection layer, and a superhydrophobic layer. By selecting fluorine-free organosilane-modified nano-zinc oxide clusters as the material for the superhydrophobic layer, the material of the superhydrophobic layer is free of fluorides, which facilitates the biodegradability of optical film waste and avoids negative impacts on the ecosystem and human health. Furthermore, the surface of the nano-zinc oxide clusters is modified with alkylsiloxanes with 12 to 22 carbon atoms, resulting in a surface energy of less than or equal to 20 mN / m for the superhydrophobic layer, forming a low surface energy surface and thus achieving superhydrophobic properties. Therefore, the optical film provided in this application simultaneously possesses fluorine-free environmental friendliness, superhydrophobicity, and low-reflection properties. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an optical film provided in an embodiment of this application;

[0022] Figure 2 This is a scanning electron microscope image of a superhydrophobic layer provided in an embodiment of this application;

[0023] Figure 3 This is a schematic flowchart of a method for preparing an optical film according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the structure of a polarizer provided in an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the structure of a display device provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Optical film; 2. Substrate layer; 3. Low-reflection layer; 4. Superhydrophobic layer; 5. Zinc oxide nanopillars; 6. Polarizer; 7. Polarizing functional layer; 8. Polarizing layer; 9. Compensation film; 10. Protective film; 11. Pressure-sensitive adhesive layer; 12. Release film; 13. Display device; 14. Display panel. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] like Figure 1 As shown, this application embodiment provides an optical film 1, which includes a substrate layer 2, a low-reflection layer 3, and a superhydrophobic layer 4. The low-reflection layer 3 is located on one side of the substrate layer 2, and the superhydrophobic layer 4 is located on the side of the low-reflection layer 3 opposite to the substrate layer 2. The superhydrophobic layer 4 is made of a fluorine-free (F)-free organosilane-modified nano-zinc oxide (ZnO) cluster. The organosilane is selected from alkylsiloxanes with 12 to 22 carbon atoms, and the surface energy of the superhydrophobic layer 4 is less than or equal to 20 mN / m.

[0030] It is understood that the optical film 1 provided in the embodiments of this application is a sandwich-type composite structure composed of a substrate layer 2, a low-reflection layer 3 and a superhydrophobic layer 4.

[0031] It should be noted that alkylsiloxanes with 12 to 22 carbon atoms are long-chain alkylsiloxanes. Modifying nano-zinc oxide clusters with these organosilicones is a chemical modification. During the modification process, the long-chain alkylsiloxanes self-assemble to form a monolayer. Self-assembly differs from manual coating (such as spraying or spin coating). Self-assembly requires no external force intervention; molecules spontaneously arrange themselves into an ordered monolayer through chemical forces (covalent bonds) and physical forces (van der Waals forces, hydrophobic interactions). This demonstrates that the modification process of the superhydrophobic layer 4 provided in this application is simple and easy to implement, which helps reduce the manufacturing cost of the superhydrophobic layer 4.

[0032] In this embodiment, by selecting fluorine-free organosilane-modified nano-zinc oxide clusters as the material of the superhydrophobic layer 4, the superhydrophobic layer 4 is free of fluorides, which facilitates the biodegradability of optical film 1 waste and avoids negative impacts on the ecosystem and human health. Furthermore, the surface of the nano-zinc oxide clusters is modified with alkylsiloxanes having 12 to 22 carbon atoms, resulting in a surface energy of the superhydrophobic layer 4 of less than or equal to 20 mN / m, forming a low surface energy surface and thus achieving superhydrophobic properties. Therefore, the optical film 1 provided in this embodiment simultaneously possesses fluorine-free environmental friendliness, superhydrophobicity, and low reflectivity.

[0033] In some embodiments, the material of the substrate layer 2 is selected from any one or a combination of triacetyl cellulose (TAC), polyethylene terephthalate (PET), and polymethyl methacrylate (PMMA).

[0034] In some embodiments, the low-reflection layer 3 is made of mesoporous silica (SiO2) or a mixed aerogel composed of titanium dioxide (TiO2) and silica (i.e., TiO2 / SiO2 mixed aerogel). Furthermore, in the mixed aerogel, the mass ratio of titanium dioxide to silica ranges from 1:9 to 3:7.

[0035] For example, when the material of the low-reflection layer 3 is a mixed aerogel composed of titanium dioxide and silicon dioxide, the mass ratio of titanium dioxide and silicon dioxide in the mixed aerogel is 1:9, 1.5:8.5, 2:8, 2.5:7.5 or 3:7.

[0036] In some embodiments, the refractive index of the low-reflection layer 3 ranges from 1.2 to 1.3, the pore size of the mesoporous silica or mixed aerogel ranges from 2 nanometers (nm) to 50 nanometers, and the porosity of the low-reflection layer 3 ranges from 70% to 85%.

[0037] For example, the refractive index of the low-reflection layer 3 is 1.2, 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.28, 1.29 or 1.3. The pore sizes of mesoporous silica or mixed aerogels are 2nm, 3nm, 4nm, 5nm, 6nm, 7nm, 8nm, 9nm, 10nm, 11nm, 12nm, 13nm, 14nm, 15nm, 16nm, 17nm, 18nm, 19nm, 20nm, 21nm, 22nm, 23nm, 24nm, 25nm, 26nm, 27nm, 28nm, 29nm, 30nm, 31nm, 32nm, 33nm, 34nm, 35nm, 36nm, 37nm, 38nm, 39nm, 40nm, 41nm, 42nm, 43nm, 44nm, 45nm, 46nm, 47nm, 48nm, 49nm, or 50nm. The porosity of the low-reflection layer 3 is 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, or 85%.

[0038] By adjusting the refractive index, pore size, and porosity of the low-reflection layer 3, a broadband anti-reflection effect can be achieved through a nanoscale porous structure.

[0039] In some embodiments, the voids in the low-reflectivity layer 3 are filled with air.

[0040] Specifically, mesoporous silica contains numerous pores filled with air. The effective refractive index of mesoporous silica can be adjusted by controlling parameters such as its porosity. As the effective refractive index of mesoporous silica gradually approaches that of air, the difference in refractive indices between the two media at the silica-air interface decreases. According to Fresnel's equation, when the difference in refractive indices between the two media decreases, the reflectivity of light at the interface also decreases. For example, when the effective refractive index of mesoporous silica is adjusted to be close to 1, light at the silica-air interface is treated as if it were propagating between media with similar refractive indices, significantly reducing the intensity of reflected light and thus achieving the goal of reducing Fresnel reflection. Therefore, the refractive index of the low-reflection layer 3 in this application matches that of the air layer, which can reduce Fresnel reflection and thus achieve an anti-reflection effect.

[0041] Of course, in other embodiments, depending on optical requirements, the voids in the low-reflection layer 3 can be filled with other fillers that meet the refractive index requirements.

[0042] In some embodiments, the thickness of the low-reflection layer 3 ranges from 80 nanometers to 150 nanometers. By adjusting the thickness of the low-reflection layer 3, the anti-reflection effect of the low-reflection layer 3 can be guaranteed.

[0043] In some embodiments, the optical film 1 has a reflectivity of less than or equal to 1.0% for light in the wavelength range of 400 nm to 700 nm, thereby achieving a low reflection effect.

[0044] In some embodiments, the low-reflection layer 3 is prepared by a sol-gel method, for example, by coating a silica sol onto the surface of the substrate layer 2, followed by aging and drying to form a mesoporous silica layer, thereby obtaining the low-reflection layer 3 directly covering the substrate layer 2. It is understood that no additional adhesive layer is required between the substrate layer 2 and the low-reflection layer 3.

[0045] In some embodiments, the root mean square (RMS) roughness of the superhydrophobic layer 4 ranges from 50 nanometers to 200 nanometers.

[0046] For example, the RMS roughness of the superhydrophobic layer 4 is 50nm, 60nm, 70nm, 80nm, 90nm, 100nm, 110nm, 120nm, 130nm, 140nm, 150nm, 160nm, 170nm, 180nm, 190nm or 200nm.

[0047] In some embodiments, such as Figure 2 As shown, the nano-zinc oxide cluster comprises multiple zinc oxide nanopillars 5.

[0048] In some embodiments, the superhydrophobic layer 4 and the low-reflection layer 3 are connected by van der Waals forces and hydrogen bonds of surface hydroxyl groups (-OH). That is, no additional adhesive layer is required between the superhydrophobic layer 4 and the low-reflection layer 3.

[0049] In some embodiments, a ZnO seed layer is formed on the low-reflectivity layer 3 by atomic deposition, then ZnO nanopillars are formed by hydrothermal growth, and finally the ZnO nanopillars are modified with organosilane to obtain a superhydrophobic layer 4.

[0050] It should be noted that since the superhydrophobic layer 4 is formed on mesoporous SiO2 or TiO2 / SiO2 mixed aerogel, and the particles of the mesoporous SiO2 or TiO2 / SiO2 mixed aerogel are at the micrometer scale while the ZnO nanopillars are at the nanometer scale, the surface of the superhydrophobic layer 4 is composed of micrometer-scale particles and nanometer-scale nanopillars, forming a hierarchical micro-nano rough surface. This results in the RMS roughness of the superhydrophobic layer 4 being between 50 nanometers and 200 nanometers. This hierarchical micro-nano rough surface can effectively achieve hydrophobicity, thus realizing the superhydrophobic function.

[0051] In some embodiments, the diameter of the zinc oxide nanopillars 5 is greater than 0 and less than 100 nanometers, the height of the zinc oxide nanopillars 5 ranges from 0.5 micrometers to 2 micrometers, and the spacing between any two adjacent zinc oxide nanopillars 5 ranges from 100 nanometers to 300 nanometers.

[0052] In a preferred embodiment, the diameter of the zinc oxide nanopillars 5 ranges from 30 nanometers to 80 nanometers.

[0053] For example, the diameter of the zinc oxide nanopillars 5 is 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, or 100 nm. The height of the zinc oxide nanopillars 5 is 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, 1.9 μm, or 2 μm. The spacing between any two adjacent zinc oxide nanopillars 5 is 100nm, 110nm, 120nm, 130nm, 140nm, 150nm, 160nm, 170nm, 180nm, 190nm, 200nm, 210nm, 220nm, 230nm, 240nm, 250nm, 260nm, 270nm, 280nm, 290nm, or 300nm.

[0054] In this embodiment, a micro / nano secondary structure is constructed using a ZnO nanopillar array. After modification with alkyl-chain siloxanes with 12 to 22 carbon atoms, a low surface energy surface with a surface energy ≤20mN / m is formed, creating a biomimetic structure similar to the surface of a lotus leaf. This biomimetic structure can act as a superhydrophobic layer, thereby achieving superhydrophobic functionality. Furthermore, by adjusting the size and spacing of the ZnO nanopillars, visible light scattering can be avoided, which is beneficial for achieving optical synergy with the low-reflection layer 3, thereby improving the optical performance of the optical film 1.

[0055] In some implementations, the organosilane is selected from any one or more combinations of dodecyltrimethoxysilane, tridecyltrimethoxysilane, tetradecyltrimethoxysilane, pentadecyltrimethoxysilane, hexadecyltrimethoxysilane, heptadecanyltrimethoxysilane, octadecyltrimethoxysilane, nonadecanyltrimethoxysilane, eicosyltrimethoxysilane, dodecyltrimethoxysilane, or dodecyltrimethoxysilane.

[0056] In one specific embodiment, the organosilane is selected from octadecyltrimethoxysilane. Since octadecyltrimethoxysilane has a low cost, modifying ZnO nanopillars with octadecyltrimethoxysilane can effectively reduce the manufacturing cost of the superhydrophobic layer 4 while ensuring hydrophobic properties.

[0057] In some embodiments, the water contact angle of the superhydrophobic layer 4 is greater than or equal to 155° and the roll-off angle is less than or equal to 5°, indicating that the superhydrophobic layer 4 provided in this application embodiment has good hydrophobic properties and can achieve self-cleaning function.

[0058] In some embodiments, such as Figure 3 As shown, the method for preparing the optical film 1 includes the following steps:

[0059] A silica sol is spin-coated onto the surface of substrate layer 2, and after aging and drying, a mesoporous SiO2 layer (i.e., low-reflection layer 3) is formed.

[0060] A ZnO seed layer was formed on a mesoporous SiO2 layer by atomic deposition.

[0061] ZnO seed layers were immersed in a zinc salt / hexamethylenetetramine solution to form ZnO nanopillars via hydrothermal growth; and

[0062] ZnO nanopillars were impregnated in a toluene solution of octadecyltrimethoxysilane to modify the ZnO nanopillars, thereby obtaining a superhydrophobic layer 4.

[0063] Understandably, the substrate layer 2 needs to be cleaned before spin-coating the silica sol onto its surface, and the ZnO nanopillars need to be cross-linked and cured after being immersed in a toluene solution of octadecyltrimethoxysilane to form the superhydrophobic layer 4.

[0064] In this embodiment, by selecting fluorine-free organosilane-modified nano-zinc oxide clusters as the material of the superhydrophobic layer 4, the superhydrophobic layer 4 is free of fluorides, which facilitates the biodegradability of optical film 1 waste and avoids negative impacts on the ecosystem and human health. Furthermore, the surface of the nano-zinc oxide clusters is modified with alkylsiloxanes with 12 to 22 carbon atoms, resulting in a surface energy of less than or equal to 20 mN / m for the superhydrophobic layer 4, forming a low surface energy surface and thus achieving superhydrophobic properties. Additionally, mesoporous SiO2 or TiO2 / SiO2 mixed aerogel is used as the material of the low-reflection layer 3, allowing the low-reflection layer 3 to reduce reflectivity to below 1%. Therefore, the optical film 1 provided in this embodiment simultaneously possesses fluorine-free environmental friendliness, superhydrophobicity, and low-reflection properties.

[0065] like Figure 4 As shown, this application embodiment also provides a polarizer 6, which includes a polarizing functional layer 7 and an optical film 1 provided in the above embodiments. The optical film 1 is located on one side of the polarizing functional layer 7.

[0066] In some embodiments, the substrate layer 2 in the optical film 1 is disposed close to the polarizing functional layer 7, and the superhydrophobic layer 4 is located on the side of the low-reflection layer 3 away from the polarizing functional layer 7.

[0067] Understandably, the optical film 1 can be a standalone finished film layer or integrated into the polarizer 6. For example, the optical film 1 can be directly bonded to the polarizing functional layer 7 as a finished film layer via an adhesive layer, so the polarizing functional layer 7 does not need an additional substrate layer 2; or, the aforementioned low-reflection layer 3 and superhydrophobic layer 4 can be directly fabricated on the existing substrate layer 2 of the polarizer 6, so that the optical film 1 is integrated into the polarizer 6.

[0068] In some embodiments, the thickness of the optical film 1 ranges from 45 micrometers to 85 micrometers.

[0069] In some embodiments, the polarizing functional layer 7 includes a polarizing layer 8, which is a polarizing core layer. The material of the polarizing layer 8 includes, but is not limited to, highly oriented polyvinyl alcohol after being stretched and dried in an iodine and boric acid solution.

[0070] In some embodiments, the thickness of the polarizing layer 8 ranges from 10 micrometers to 30 micrometers.

[0071] In some embodiments, the polarizing functional layer 7 further includes a compensation film 9, the material of which is a polymer material. By extending and aligning the polymer material, the refractive index in each direction is changed to achieve the specified optical properties.

[0072] In some embodiments, the thickness of the compensation film 9 ranges from 40 micrometers to 80 micrometers.

[0073] In some embodiments, the polarizer 6 further includes a protective film 10 disposed on the side of the optical film 1 opposite to the polarizing functional layer 7, and the material of the protective film 10 is selected from any one or more combinations of polyethylene terephthalate (PET) and polycarbonate (PC).

[0074] In some embodiments, the protective film 10 is about 50 micrometers thick, and the polarizer 6 removes the protective film 10 during use.

[0075] In some embodiments, the polarizer 6 further includes a pressure-sensitive adhesive (PSA) layer 11 disposed on the side of the polarizing functional layer 7 opposite to the optical film 1, and the material of the PSA layer 11 includes, but is not limited to, acrylic PSA.

[0076] Understandably, polarizer 6 is bonded to the glass substrate on the display panel through the PSA layer under external pressure, ensuring the adhesion between polarizer 6 and the glass substrate and avoiding peeling problems between the two.

[0077] In some embodiments, the polarizer 6 further includes a release film 12 disposed on the side of the pressure-sensitive adhesive layer 11 opposite to the polarizing functional layer 7, and the material of the release film 12 includes, but is not limited to, PET.

[0078] In some embodiments, the release film 12 has a thickness of about 50 micrometers, and the polarizer 6 removes the release film 12 during use.

[0079] In this embodiment, since the optical film 1 in the polarizer 6 has the properties of being fluorine-free, environmentally friendly, superhydrophobic, and low-reflection, the polarizer 6 also has the properties of being fluorine-free, environmentally friendly, superhydrophobic, and low-reflection.

[0080] like Figure 5 As shown, this application embodiment also provides a display device 13, which includes a display panel 14 and a polarizer 6 as described in the above embodiments. The polarizer 6 is located on the light-emitting side of the display panel 14, and the optical film 1 is located on the side of the polarizing functional layer 7 away from the display panel 14; or, the display device 13 includes a display panel 14 and the optical film 1 as described in the above embodiments, and the optical film 1 is located on the light-emitting side of the display panel 14.

[0081] In other words, the optical film 1 can be disposed separately on the light-emitting side of the display panel 14, or it can be disposed in the polarizer 6, and the polarizer 6 containing the optical film 1 can be disposed on the light-emitting side of the display panel 14.

[0082] In some embodiments, the display panel 14 is a liquid crystal display panel. In this case, the display device 13 further includes a backlight module disposed on the side of the display panel 14 away from the optical film 1. The structure of the backlight module is not limited in the embodiments of this application.

[0083] In other embodiments, the display panel 14 may be an organic electroluminescent display panel, such as an OLED display panel 14, but is not limited thereto.

[0084] In this embodiment, since the optical film 1 has the properties of being fluorine-free and environmentally friendly, superhydrophobic and low reflectivity, the surface of the light-emitting side of the display device 13 has superhydrophobic and low reflectivity.

[0085] The foregoing has provided a detailed description of an optical film, polarizer, and display device provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An optical film, characterized in that, include: Substrate layer; A low-reflection layer is located on one side of the substrate layer; as well as A superhydrophobic layer is located on the side of the low-reflection layer opposite to the substrate layer; The superhydrophobic layer is made of a nano-zinc oxide cluster modified with an organosilane that does not contain fluorine. The organosilane is selected from alkylsiloxanes with 12 to 22 carbon atoms, and the surface energy of the superhydrophobic layer is less than or equal to 20 mN / m.

2. The optical film according to claim 1, characterized in that, The nano-zinc oxide cluster comprises multiple zinc oxide nanopillars.

3. The optical film according to claim 2, characterized in that, The zinc oxide nanopillars have a diameter greater than 0 and less than 100 nanometers, a height ranging from 0.5 micrometers to 2 micrometers, and a spacing between any two adjacent zinc oxide nanopillars ranging from 100 nanometers to 300 nanometers.

4. The optical film according to claim 1, characterized in that, The root mean square roughness of the superhydrophobic layer ranges from 50 nanometers to 200 nanometers; the water contact angle of the superhydrophobic layer is greater than or equal to 155°, and the roll-off angle is less than or equal to 5°.

5. The optical film according to any one of claims 1 to 4, characterized in that, The low-reflection layer is made of mesoporous silica or a mixed aerogel composed of titanium dioxide and silica; in the mixed aerogel, the mass ratio of titanium dioxide and silica ranges from 1:9 to 3:

7.

6. The optical film according to claim 5, characterized in that, The refractive index of the low-reflection layer ranges from 1.2 to 1.3, the pore size of the mesoporous silica or the mixed aerogel ranges from 2 nanometers to 50 nanometers, and the porosity of the low-reflection layer ranges from 70% to 85%.

7. The optical film according to claim 6, characterized in that, The voids in the low-reflectivity layer are filled with air.

8. The optical film according to claim 5, characterized in that, The optical film has a reflectivity of less than or equal to 1.0% for light with wavelengths in the range of 400 nm to 700 nm.

9. A polarizer, characterized in that, It includes a polarizing functional layer and an optical film as described in any one of claims 1 to 8, wherein the optical film is located on one side of the polarizing functional layer.

10. A display device, characterized in that, The display device includes a display panel and a polarizer as described in claim 9, wherein the polarizer is located on the light-emitting side of the display panel and the optical film is located on the side of the polarizing functional layer opposite to the display panel; or, the display device includes the display panel and an optical film as described in any one of claims 1 to 8, wherein the optical film is located on the light-emitting side of the display panel.

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