Polarizer and display device

Abstract

The invention relates to a polaroid and a display device. The polaroid comprises a polarizing functional layer and a self-cleaning antibacterial functional layer located on one side of the polarizing functional layer. The self-cleaning antibacterial functional layer comprises a self-cleaning antibacterial coating, the self-cleaning antibacterial coating comprises a substrate coating and nano silicon dioxide particles, nano silver particles and nano titanium dioxide particles which are dispersed in the substrate coating, and the water drop contact angle of the face, away from the polarized light functional layer, of the self-cleaning antibacterial coating is larger than 90 degrees. According to the polaroid, the hardness of the surface of the polaroid can be improved, meanwhile, the antibacterial effect and the self-cleaning effect of the surface of the polaroid are effectively improved, and therefore the overall viewing experience can be effectively improved when the polaroid is applied to the display device.

Description

Technical Field

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

[0002] With technological advancements, borderless LCD TVs are a growing trend. Currently, the LCD panels of borderless LCD TVs are completely exposed to the field of view, creating a borderless display effect. Polarizers are a crucial component of LCD panels. When the LCD panels are assembled into a complete TV, the protective films made of polyethylene terephthalate (PET) covering the upper and lower polarizers of the LCD panel are removed. After the protective films are removed, the polarizers are exposed to the air, causing the upper polarizer to inadvertently become contaminated with fingerprints, water stains, oil stains, dust, and other organic matter during daily use. These organic matter can breed bacteria and produce plaque, affecting the overall viewing experience. Typically, water or household alcohol is used for cleaning. However, since the surface water contact angle of current polarizers is between 60 and 90°, they are somewhat water-resistant but not completely water-resistant, making them difficult to completely clean and leaving watermarks after cleaning.

[0003] Therefore, antibacterial and decontamination of the polarizer surface becomes a problem that needs to be solved. Summary of the Invention

[0004] The embodiments of the present application provide a polarizer and a display device, which can effectively enhance the antibacterial and self-cleaning effects of the polarizer surface while increasing the hardness of the polarizer surface, thereby effectively improving the overall viewing experience when the polarizer is used in a display device.

[0005] To achieve the above objectives, according to a first aspect of the present application, a polarizer is provided, comprising a polarizing functional layer and a self-cleaning antibacterial functional layer located on one side of the polarizing functional layer; the self-cleaning antibacterial functional layer comprises a self-cleaning antibacterial coating, the self-cleaning antibacterial coating comprising a base coating and nano-silicon dioxide particles, nano-silver particles, and nano-titanium dioxide particles dispersed in the base coating; a water droplet contact angle of a side of the self-cleaning antibacterial coating away from the polarizing functional layer is greater than 90°.

[0006] In some embodiments, the nano-silicon dioxide particles, the nano-silver particles, and the nano-titanium dioxide particles are distributed at least on a side of the self-cleaning antibacterial coating away from the polarizing functional layer.

[0007] In some embodiments, the material of the base coating is selected from at least one of perfluoroalkylchlorosilane and perfluoroalkylalkoxysilane.

[0008] In some embodiments, in the self-cleaning antibacterial coating, the mass fraction of the nano-silicon dioxide particles ranges from 1% to 20%, the mass fraction of the nano-silver particles ranges from 0.01% to 1%, and the mass fraction of the nano-titanium dioxide particles ranges from 0.01% to 1%.

[0009] In some embodiments, the roughness of the side of the self-cleaning antibacterial coating facing away from the polarizing functional layer ranges from 500 nanometers to 900 nanometers.

[0010] In some embodiments, the haze of the self-cleaning antibacterial coating ranges from 1% to 40%, the optical transmittance of the self-cleaning antibacterial coating ranges from 80% to 95%, and the pencil hardness of the self-cleaning antibacterial coating is greater than or equal to 2H.

[0011] In some embodiments, the self-cleaning antibacterial functional layer further includes a transparent auxiliary layer located between the polarizing functional layer and the self-cleaning antibacterial coating, and the side of the transparent auxiliary layer facing away from the polarizing functional layer is a rough surface; the self-cleaning antibacterial coating covers the rough surface of the transparent auxiliary layer.

[0012] In some embodiments, the material of the transparent auxiliary layer is selected from aluminum oxide having a boehmite structure.

[0013] In some embodiments, the water drop contact angle of the self-cleaning antibacterial functional layer is greater than or equal to 150°, and the sliding angle of the self-cleaning antibacterial functional layer is less than or equal to 10°.

[0014] According to a second aspect of the present application, a display device is provided, comprising a display module and the polarizer described above, wherein the polarizer is at least arranged on a light-emitting side of the display module.

[0015] In the polarizer and display device of the embodiment of the present application, since the nano-titanium dioxide particles have a photocatalytic degradation effect and super hydrophilicity, they can not only decompose the organic matter enriched on its surface, but also make the organic matter on its surface more easily washed away by water. Therefore, by adding nano-titanium dioxide particles to the self-cleaning antibacterial coating, it is possible to prevent organic matter from breeding bacteria and producing plaque on the surface of the polarizer, thereby playing an antibacterial role. In addition, since the nano-titanium dioxide particles have photocatalytic activity, they can effectively reduce the accumulation of static electricity on the surface of the self-cleaning antibacterial coating, thereby preventing organic pollutants in the air from being adsorbed on its surface, so that the self-cleaning antibacterial coating maintains antibacterial and super hydrophobic properties for a long time. In addition, by adding nano-silver particles to the self-cleaning antibacterial coating, the free release of silver ions in the nano-silver particles will induce cell death of microbial cells attached to the surface of the polarizer, so that the self-cleaning antibacterial coating has an antibacterial effect, thereby further improving the antibacterial effect of the polarizer surface. Furthermore, by adding nano-silica particles to the self-cleaning antibacterial coating, the nano-silica particles can provide high roughness and high hardness, which is beneficial to increase the hardness of the self-cleaning antibacterial coating while improving the hydrophobicity of the coating, thereby further increasing the water droplet contact angle of the self-cleaning antibacterial coating, making the water droplet contact angle greater than 90°, thereby further improving the self-cleaning effect of the self-cleaning antibacterial coating, and thus further improving the self-cleaning effect of the polarizer surface.

[0016] Therefore, the embodiment of the present application simultaneously adds nano-silicon dioxide particles, nano-silver particles and nano-titanium dioxide particles to the self-cleaning antibacterial coating, which can effectively increase the hardness of the polarizer surface while effectively increasing the water droplet contact angle on the polarizer surface, thereby effectively improving the antibacterial effect and self-cleaning effect of the polarizer surface, so that when the polarizer is used in a display device, it can effectively improve the overall viewing experience.

[0017] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0019] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0020] Figure 1 is a schematic diagram of a cross-sectional structure of an exemplary liquid crystal display panel;

[0021] Figure 2 1 is a schematic diagram of the cross-sectional structure of a polarizer provided in an embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of a self-cleaning antibacterial functional layer provided in an embodiment of the present application;

[0023] Figure 4 is a schematic cross-sectional structural diagram of a display device provided in an embodiment of the present application;

[0024] Figure 5 It is a schematic cross-sectional structural diagram of another display device provided in an embodiment of the present application.

[0025] Explanation of the accompanying drawings: 1. Liquid crystal display panel; 2. Liquid crystal box; 3. Upper polarizer; 4. Lower polarizer; 5. First protective film; 6. Second protective film; 7. Polarizer; 8. Polarizing functional layer; 9. Self-cleaning antibacterial functional layer; 10. Self-cleaning antibacterial coating; 11. Base coating; 12. Silicon dioxide particles; 13. Nanosilver particles; 14. Nanotitanium dioxide particles; 15. Adhesive layer; 16. First substrate layer; 17. Polarizing layer; 18. Second substrate layer; 19. Transparent auxiliary layer; 20. Rough surface; 21. Display device; 22. Display module. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0027] like Figure 1 As shown, when leaving the factory, the liquid crystal display panel 1 includes a liquid crystal cell 2, an upper polarizer 3 and a lower polarizer 4 arranged on opposite sides of the liquid crystal cell 2, a first protective film 5 arranged on the side of the upper polarizer 3 facing away from the liquid crystal cell 2, and a second protective film 6 arranged on the side of the lower polarizer 4 facing away from the liquid crystal cell 2. When the liquid crystal display panel 1 is assembled into a complete device, the first protective film 5 and the second protective film 6 are removed. After the protective films are removed, the sides of the upper polarizer 3 and the lower polarizer 4 facing away from the liquid crystal cell 2 are exposed to the air. As a result, during assembly or use, the sides of the upper polarizer 3 and the lower polarizer 4 facing away from the liquid crystal cell 2 may be unintentionally contaminated with fingerprints, water stains, oil stains, dust, etc. In addition, organic matter on the surface of the polarizers can breed bacteria and produce plaque, affecting the overall viewing experience.

[0028] Typically, the coating on the surface of the polarizer is an anti-glare coating or a low-reflection coating composed of silica and resin materials. The water drop contact angle of this anti-glare coating or low-reflection coating is between 60° and 90°, which has a certain degree of hydrophilicity, but is not completely super-hydrophilic. Its surface cannot be completely cleaned, and watermarks will be left after cleaning.

[0029] To address the above issues, the present invention provides a polarizer that replaces conventional anti-glare (AG) or low-reflective (LR) coatings by forming a super-hydrophobic layer on the surface of the polarizer. The super-hydrophobic layer provided in the present invention has a water droplet contact angle greater than or equal to 150° and has antibacterial properties, thereby providing the polarizer with excellent self-cleaning and antibacterial properties. For details, please refer to the following embodiments.

[0030] like Figure 2 and Figure 3 As shown, an embodiment of the present application provides a polarizer 7, which includes a polarizing functional layer 8 and a self-cleaning antibacterial functional layer 9 located on one side of the polarizing functional layer 8. The self-cleaning antibacterial functional layer 9 includes a self-cleaning antibacterial coating 10, which includes a base coating 11 and nano-silicon dioxide (SiO2) particles 12, nano-silver (Ag) particles 13, and nano-titanium dioxide (TiO2) particles 14 dispersed in the base coating 11. The water droplet contact angle of the self-cleaning antibacterial coating 10 on the side away from the polarizing functional layer 8 is greater than 90°.

[0031] It can be understood that the polarizing functional layer 8 provided in the embodiment of the present application has a polarizing effect, and the self-cleaning and antibacterial functional layer 9 has self-cleaning and antibacterial effects, so that the surface of the polarizer 7 has self-cleaning and antibacterial effects.

[0032] On the one hand, since the nano-titanium dioxide particles 14 have a photocatalytic degradation effect, the organic matter enriched on the surface of the nano-titanium dioxide particles 14 is decomposed, and since the surface of the nano-titanium dioxide particles 14 has super hydrophilicity, the organic matter attached to the surface of the nano-titanium dioxide particles 14 is easier to be washed away by water. Therefore, by adding the nano-titanium dioxide particles 14 to the self-cleaning antibacterial coating 10, it is possible to prevent the organic matter from breeding bacteria and producing plaque on the surface of the polarizer 7, thereby playing an antibacterial role. In addition, by adding the nano-titanium dioxide particles 14 with photocatalytic activity to the self-cleaning antibacterial coating 10, the accumulation of static electricity on the surface of the self-cleaning antibacterial coating 10 is greatly reduced, making it more difficult for organic pollutants in the air to be adsorbed on the surface of the self-cleaning antibacterial coating 10, so that the self-cleaning antibacterial coating 10 can maintain its antibacterial and super hydrophobic properties for a longer period of time, thereby playing an antibacterial and self-cleaning role. Therefore, by adding the nano-titanium dioxide particles 14 to the self-cleaning antibacterial coating 10, the surface of the polarizer 7 has good antibacterial and self-cleaning effects.

[0033] On the other hand, by adding nanosilver particles 13 to the self-cleaning antibacterial coating 10, the free release of silver ions in the nanosilver particles 13 will induce cell death of microbial cells attached to the surface of the polarizer 7, so that the self-cleaning antibacterial coating 10 has an antibacterial effect, thereby further improving the antibacterial effect of the surface of the polarizer 7.

[0034] On the other hand, by adding nano-silica particles 12 to the self-cleaning antibacterial coating 10, the nano-silica particles 12 can provide high roughness and high hardness, which is beneficial to increasing the hardness of the self-cleaning antibacterial coating 10 while improving the hydrophobicity of the coating, thereby further improving the water droplet contact angle of the self-cleaning antibacterial coating 10, making the water droplet contact angle greater than 90°, thereby further improving the self-cleaning effect of the self-cleaning antibacterial coating 10, thereby further improving the self-cleaning effect of the surface of the polarizer 7.

[0035] Therefore, the embodiment of the present application simultaneously adds nano-silicon dioxide particles 12, nano-silver particles 13 and nano-titanium dioxide particles 14 to the self-cleaning antibacterial coating 10, thereby improving the hardness of the surface of the polarizer 7 while effectively improving the water droplet contact angle on the surface of the polarizer, thereby effectively improving the antibacterial effect and self-cleaning effect of the surface of the polarizer 7, so that when the polarizer 7 is used in a display device, the overall viewing experience can be effectively improved.

[0036] In some embodiments, the polarizing functional layer 8 includes an adhesive layer 15 , a first substrate layer 16 , a polarizing layer 17 , and a second substrate layer 18 . The self-cleaning antibacterial functional layer 9 is disposed on a side of the second substrate layer 18 facing away from the polarizing layer 17 .

[0037] In some embodiments, the adhesive layer 15 includes a pressure sensitive adhesive (PSA), such as an acrylic pressure sensitive adhesive. Of course, the material of the adhesive layer 15 is not limited thereto.

[0038] It can be understood that the polarizer 7 and the display module (such as a liquid crystal cell, but not limited thereto) are bonded together via the adhesive layer 15 .

[0039] In some embodiments, the thickness of the adhesive layer 15 ranges from 10 μm to 50 μm. For example, the thickness of the adhesive layer 15 is 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, or 50 μm. Setting the adhesive within this range ensures adhesion between the polarizer 7 and the display module while maintaining the overall transmittance of the polarizer 7.

[0040] In some embodiments, the first substrate layer 16 is a protective layer and an optical compensation layer of the polarizer 7 , protecting the polarizing layer 17 from external forces, temperature, and moisture, and compensating for color deviation of the film liquid crystal.

[0041] In some embodiments, the material of the first substrate layer 16 is selected from at least one of triacetate cellulose (TAC), double cationic covalent organic polymer (DCOP), and polymethyl methacrylate (PMMA), but is not limited thereto.

[0042] In some embodiments, the thickness of the first substrate layer 16 ranges from 30 μm to 90 μm, for example, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, or 90 μm.

[0043] In some embodiments, the material of polarizing layer 17 includes polyvinyl alcohol (PVA). For example, polarizing layer 17 is a highly oriented polyvinyl alcohol film layer that has been stretched and dried in an iodine and boric acid solution. Polarizing layer 17 is the core layer of polarizer 7 and performs polarization.

[0044] In some embodiments, the polarizing layer 17 has a thickness ranging from 10 μm to 30 μm, for example, 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 22 μm, 25 μm, 28 μm, or 30 μm.

[0045] In some embodiments, the second substrate layer 18 is a protective layer of the polarizer 7 , protecting the polarizer layer 17 from external forces, temperature, and moisture.

[0046] In some embodiments, the material of the second substrate layer 18 is selected from at least one of TAC, PET, and PMMA, but is not limited thereto.

[0047] In some embodiments, the second substrate layer 18 has a thickness ranging from 30 μm to 90 μm, for example, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, or 90 μm.

[0048] In some embodiments, the polarizer 7 also includes a protective film (not shown in the figure) located on the side of the adhesive layer 15 facing away from the first substrate layer 16 and the side of the self-cleaning antibacterial functional layer 9 facing away from the second substrate layer 18. When the polarizer 7 is attached to the display module, the protective film on the polarizer 7 will be torn off.

[0049] In some embodiments, the material of the protective film is selected from PET and PSA, but is not limited thereto. For example, the protective film is composed of a PSA layer and a PET layer, so that the protective film can be attached to the surface of the polarizer 7 and can protect the polarizer 7.

[0050] In some embodiments, the silicon dioxide nanoparticles 12, the silver nanoparticles 13, and the titanium dioxide nanoparticles 14 are distributed at least on the side of the self-cleaning antibacterial coating 10 away from the polarizing layer 8. This allows the side of the self-cleaning antibacterial coating 10 away from the polarizing layer 8 to have good self-cleaning and antibacterial effects.

[0051] In some embodiments, the material of the base coating 11 of the self-cleaning antimicrobial coating 10 is selected from at least one of perfluoroalkylchlorosilane and perfluoroalkylalkoxysilane.

[0052] It is understandable that the self-cleaning antibacterial coating 10 can be made by coating, but is not limited thereto.

[0053] In one specific embodiment, the nano-silica particles 12, the nano-silver particles 13, and the nano-titanium dioxide particles 14 can be mixed in a preset ratio and added to perfluoroalkylchlorosilane or perfluoroalkylalkoxysilane to form a mixed liquid. The mixed liquid is then coated on one side of the polarizing functional layer 8 and cured by ultraviolet light (UV) to form a self-cleaning antibacterial coating 10.

[0054] It can be understood that when a transparent auxiliary layer 19 is further provided on the surface of the polarizing functional layer 8 , the mixed liquid is coated onto the rough surface 20 of the transparent auxiliary layer 19 .

[0055] Since the nano-titanium dioxide particles 14 contain active substances, they are difficult to diffuse in the base coating 11 with long-chain perfluoroalkyl groups, so they have a longer diffusion distance, making it easier for organic pollutants in the air to accumulate on the surface of the nano-titanium dioxide particles 14. Since the nano-titanium dioxide particles 14 have a photocatalytic degradation effect, the organic matter accumulated on their surface is decomposed. Moreover, since the surface of the nano-titanium dioxide particles 14 is super hydrophilic, the organic matter attached to their surface is easier to be washed away by water. Therefore, by adding nano-titanium dioxide particles 14 to the self-cleaning antibacterial coating 10, it is possible to prevent organic matter from breeding bacteria and producing plaque on the surface of the polarizer 7, thereby playing an antibacterial role.

[0056] In some embodiments, in the self-cleaning antimicrobial coating 10 , the mass fraction of the nano-silicon dioxide particles 12 ranges from 1% to 20%, the mass fraction of the nano-silver particles 13 ranges from 0.01% to 1%, and the mass fraction of the nano-titanium dioxide particles 14 ranges from 0.01% to 1%.

[0057] For example, in the self-cleaning antibacterial coating 10, the mass fraction of the nano-silicon dioxide particles 12 is 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19% or 20%, but is not limited thereto; the mass fraction of the nano-silver particles 13 is 0.01%, 0.05%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, 0.40%, 0.45%, 0.50%, 0.55%, 0.60%, 0.70%, 0.80%, 0.90%, 10.10%, 11. %, 0.65%, 0.70%, 0.75%, 0.80%, 0.85%, 0.90%, 0.95% or 1%, but not limited thereto; the mass fraction of the nano-titanium dioxide particles 14 is 0.01%, 0.05%, 0.10%, 0.15%, 0.20%, 0.25%, 0.30%, 0.35%, 0.40%, 0.45%, 0.50%, 0.55%, 0.60%, 0.65%, 0.70%, 0.75%, 0.80%, 0.85%, 0.90%, 0.95% or 1%, but not limited thereto.

[0058] In some embodiments, the roughness of the side of the self-cleaning antimicrobial coating 10 facing away from the polarizing layer 8 is in a range of 500 nm to 900 nm. For example, the roughness of the side of the self-cleaning antimicrobial coating 10 facing away from the polarizing layer 8 is 500 nm, 520 nm, 550 nm, 600 nm, 620 nm, 650 nm, 680 nm, 700 nm, 720 nm, 750 nm, 760 nm, 790 nm, 800 nm, 820 nm, 850 nm, 880 nm, or 900 nm, but is not limited thereto.

[0059] It can be understood that by adding nano-silica particles 12 to the self-cleaning antibacterial coating 10, the roughness of the self-cleaning antibacterial coating 10 can be increased, thereby increasing the water droplet contact angle of the self-cleaning antibacterial functional layer 9, making the surface of the self-cleaning antibacterial functional layer 9 superhydrophobic, thereby making the surface of the self-cleaning antibacterial functional layer 9 have good self-cleaning function.

[0060] In some embodiments, the thickness of the self-cleaning antimicrobial coating 10 ranges from 0.5 μm to 5 μm, for example, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, or 5 μm, but is not limited thereto.

[0061] In some embodiments, the haze range of the self-cleaning antibacterial coating 10 is 1% to 40%, and the optical transmittance range of the self-cleaning antibacterial coating 10 is 80% to 95%, which shows that the self-cleaning antibacterial coating 10 provided in the embodiment of the present application has low haze and high optical transmittance, which is beneficial to improving the optical effect of the polarizer 7.

[0062] In some embodiments, the self-cleaning antimicrobial coating 10 has a pencil hardness greater than or equal to 2H.

[0063] In one embodiment, the pencil hardness of the self-cleaning antimicrobial coating 10 is equal to 3H, but is not limited thereto.

[0064] It can be understood that by adding the nano-silica particles 12 to the self-cleaning antibacterial coating 10 , the hardness of the self-cleaning antibacterial coating 10 is increased, which can prevent the surface of the polarizer 7 from being scratched.

[0065] In some embodiments, the self-cleaning antimicrobial functional layer 9 further includes a transparent auxiliary layer 19 positioned between the polarizing functional layer 8 and the self-cleaning antimicrobial coating 10, wherein the side of the transparent auxiliary layer 19 facing away from the polarizing functional layer 8 is a rough surface 20. The self-cleaning antimicrobial coating 10 covers the rough surface 20 of the transparent auxiliary layer 19.

[0066] It should be noted that the transparent auxiliary layer 19 has good light transmittance, which is beneficial to improving the light transmittance of the polarizer 7. At the same time, the side of the transparent auxiliary layer 19 facing away from the polarizing functional layer 8 is a rough surface 20. Coating the self-cleaning antibacterial coating 10 on the rough surface 20 is beneficial to improving the roughness of the self-cleaning antibacterial coating 10, thereby helping to increase the water droplet contact angle of the self-cleaning antibacterial functional layer 9, thereby improving the self-cleaning ability of the self-cleaning antibacterial functional layer 9.

[0067] It is understood that although the roughness of the self-cleaning antimicrobial coating 10 can be increased by adding the nano-silica particles 12 to the self-cleaning antimicrobial coating 10, to further improve the hydrophobicity of the self-cleaning antimicrobial functional layer 9, the roughness of the self-cleaning antimicrobial coating 10 needs to be further increased by the rough surface 20 of the transparent auxiliary layer 19. Therefore, the combination of the self-cleaning antimicrobial coating 10 and the transparent auxiliary layer 19 makes the self-cleaning antimicrobial functional layer 9 superhydrophobic, thereby enhancing the self-cleaning ability of the self-cleaning antimicrobial functional layer 9.

[0068] In one embodiment, the material of the transparent auxiliary layer 19 is selected from aluminum oxide having a boehmite structure. For example, the transparent auxiliary layer 19 is a transparent boehmite aluminum oxide layer formed by a sol-gel method, and the transparent boehmite aluminum oxide layer is heat-treated to make the surface transparent and rough. The heat treatment temperature of the transparent boehmite aluminum oxide layer ranges from 50° C. to 80° C.

[0069] It should be noted that the embodiment of the present application does not limit the material of the transparent auxiliary layer 19, as long as it meets the optical performance and roughness requirements.

[0070] In some embodiments, the thickness of the transparent auxiliary layer 19 ranges from 0.5 μm to 5 μm, for example, 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, or 5 μm, but is not limited thereto.

[0071] In some embodiments, the water drop contact angle of the self-cleaning antibacterial functional layer 9 is greater than or equal to 150°, and the rolling angle of the self-cleaning antibacterial functional layer 9 is less than or equal to 10°.

[0072] It can be understood that the water droplet contact angle of the self-cleaning antibacterial functional layer 9 is greater than or equal to 150°, indicating that the self-cleaning antibacterial functional layer 9 is a superhydrophobic layer. Water droplets can automatically roll in a spherical shape on the surface of the self-cleaning antibacterial functional layer 9 and have good self-cleaning function.

[0073] Compared with conventional anti-glare coatings or low-reflection coatings, the water droplet contact angle of the self-cleaning antibacterial functional layer 9 provided in the embodiment of the present application is significantly improved, which can effectively improve the self-cleaning effect.

[0074] The present invention also provides three self-cleaning antibacterial functional layers with different formulations, and the physical properties of these three self-cleaning antibacterial functional layers are measured. The formulations of the three self-cleaning antibacterial functional layers are shown in Table 1, and the physical properties of the three self-cleaning antibacterial functional layers are shown in Table 2.

[0075] Table 1

[0076] Recipe 1 Recipe 2 Recipe 3 Transparent auxiliary layer thickness / μm 3 5 5 Self-cleaning antibacterial coating thickness / μm 3 3 3 Nano-silica particles / wt% 2 5 10 Nanosilver particles / wt% 0.05 0.05 0.05 Nano-titanium dioxide particles / wt% 0.05 0.05 0.1

[0077] It can be seen from Table 1 that the three self-cleaning and antibacterial functional layers obtained according to Formula 1, Formula 2 and Formula 3 are all within the scope to be protected by the embodiments of the present application.

[0078] Table 2

[0079] Recipe 1 Recipe 2 Recipe 3 Roughness / nm 650 760 790 hardness 3H 3H 3H Haze / % 2.5 8 15 Water drop contact angle / ° 156 165 167 Roll angle / ° 6 7 8 Transmittance / % 94 93 90

[0080] As can be seen from Table 2, the roughness of the three self-cleaning antibacterial functional layers obtained according to Formula 1, Formula 2 and Formula 3 is between 500 nanometers and 900 nanometers, the hardness is 3H, the haze is between 1% and 40%, the water drop contact angle is greater than 150°, the rolling angle is less than 10°, and the optical transmittance is greater than or equal to 90%. This shows that the self-cleaning antibacterial coating provided by the embodiment of the present application has super hydrophobicity on the basis of ensuring high hardness and good optical properties, and can improve the self-cleaning effect of the polarizer surface without affecting the optical properties of the polarizer. At the same time, due to the good self-cleaning effect of the polarizer surface, it can prevent organic matter from adhering to the polarizer surface, and under the antibacterial effect of the nano-silver particles and nano-titanium dioxide particles, the polarizer surface also has a good antibacterial effect.

[0081] In the embodiment of the present application, since the nano-titanium dioxide particles 14 have a photocatalytic degradation effect and super-hydrophilicity, they can not only decompose the organic matter enriched on their surface, but also make the organic matter on their surface more easily washed away by water. Therefore, by adding nano-titanium dioxide particles 14 to the self-cleaning antibacterial coating 10, it is possible to prevent organic matter from breeding bacteria and producing plaque on the surface of the polarizer 7, thereby playing an antibacterial role. Moreover, since the nano-titanium dioxide particles 14 have photocatalytic activity, they can effectively reduce the accumulation of static electricity on the surface of the self-cleaning antibacterial coating 10, thereby preventing organic pollutants in the air from being adsorbed on its surface, allowing the self-cleaning antibacterial coating 10 to maintain antibacterial and super-hydrophobic properties for a long time. In addition, by adding nano-silver particles 13 to the self-cleaning antibacterial coating 10, the free release of silver ions in the nano-silver particles 13 will induce cell death of microbial cells attached to the surface of the polarizer 7, so that the self-cleaning antibacterial coating 10 has an antibacterial effect, thereby further improving the antibacterial effect of the surface of the polarizer 7. Furthermore, by adding nano-silica particles 12 to the self-cleaning antibacterial coating 10, the nano-silica particles 12 can provide high roughness and high hardness, which is beneficial to increase the hardness of the self-cleaning antibacterial coating 10 while improving the hydrophobicity of the coating, thereby increasing the water droplet contact angle of the self-cleaning antibacterial coating 10, so that the self-cleaning effect of the self-cleaning antibacterial coating 10 is further improved, thereby further improving the self-cleaning effect of the surface of the polarizer 7.

[0082] Therefore, the embodiment of the present application simultaneously adds nano-silicon dioxide particles 12, nano-silver particles 13 and nano-titanium dioxide particles 14 to the self-cleaning antibacterial coating 10, thereby improving the hardness of the surface of the polarizer 7 while effectively enhancing the antibacterial effect and self-cleaning effect of the surface of the polarizer 7, thereby effectively improving the overall viewing experience when the polarizer 7 is used in a display device.

[0083] like Figure 4 and Figure 5As shown, an embodiment of the present application further provides a display device 21 , which includes a display module 22 and the polarizer 7 described in the aforementioned embodiment. The polarizer 7 is at least arranged on the light-emitting side of the display module 22 .

[0084] In some embodiments, as Figure 4 As shown, the display device 21 is a liquid crystal display device. Correspondingly, the display module 22 includes a liquid crystal box, and the polarizer 7 is arranged on opposite sides of the liquid crystal box, so that the display device 21 can display normally and can reduce the reflected light of the display surface, thereby improving the display effect and contrast of the display device 21.

[0085] It can be understood that the self-cleaning antibacterial functional layer 9 is located on the side of the polarizing functional layer 8 facing away from the liquid crystal cell.

[0086] In other embodiments, Figure 5 As shown, the display device 21 may also be an organic electroluminescent display device, and the polarizer 7 is arranged on the light-emitting side of the display module 22 to reduce the reflected light of the display surface, thereby improving the display effect and contrast of the display device 21.

[0087] In the embodiment of the present application, by simultaneously adding nano-silicon dioxide particles 12, nano-silver particles 13 and nano-titanium dioxide particles 14 to the self-cleaning antibacterial coating 10, the hardness of the surface of the polarizer 7 can be increased while effectively improving the antibacterial effect and self-cleaning effect of the surface of the polarizer 7, so that when the polarizer 7 is applied to the display device 21, the overall viewing experience can be effectively improved.

[0088] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0089] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0090] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0091] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A polarizer, characterized in that: It comprises a polarizing functional layer and a self-cleaning antibacterial functional layer located on one side of the polarizing functional layer; the self-cleaning antibacterial functional layer comprises a self-cleaning antibacterial coating, the self-cleaning antibacterial coating comprises a base coating and nano-silicon dioxide particles, nano-silver particles and nano-titanium dioxide particles dispersed in the base coating, and a water drop contact angle of a side of the self-cleaning antibacterial coating away from the polarizing functional layer is greater than 90°.

2. The polarizer according to claim 1, characterized in that: The nano silicon dioxide particles, the nano silver particles and the nano titanium dioxide particles are at least distributed on a side of the self-cleaning antibacterial coating away from the polarizing functional layer.

3. The polarizer according to claim 1, characterized in that: The material of the base coating is selected from at least one of perfluoroalkyl chlorosilane and perfluoroalkyl alkoxysilane.

4. The polarizer according to claim 1, characterized in that: In the self-cleaning antibacterial coating, the mass fraction of the nano-silicon dioxide particles ranges from 1% to 20%, the mass fraction of the nano-silver particles ranges from 0.01% to 1%, and the mass fraction of the nano-titanium dioxide particles ranges from 0.01% to 1%.

5. The polarizer according to any one of claims 1 to 4, characterized in that: The roughness of the self-cleaning antibacterial coating on the side away from the polarizing functional layer ranges from 500 nanometers to 900 nanometers.

6. The polarizer according to any one of claims 1 to 4, characterized in that: The haze of the self-cleaning antibacterial coating ranges from 1% to 40%, the optical transmittance of the self-cleaning antibacterial coating ranges from 80% to 95%, and the pencil hardness of the self-cleaning antibacterial coating is greater than or equal to 2H.

7. The polarizer according to any one of claims 1 to 4, characterized in that: The self-cleaning antibacterial functional layer also includes a transparent auxiliary layer located between the polarizing functional layer and the self-cleaning antibacterial coating, and the side of the transparent auxiliary layer away from the polarizing functional layer is a rough surface; the self-cleaning antibacterial coating covers the rough surface of the transparent auxiliary layer.

8. The polarizer according to claim 7, characterized in that: The material of the transparent auxiliary layer is selected from aluminum oxide having a boehmite structure.

9. The polarizer according to any one of claims 1 to 4, characterized in that: The water drop contact angle of the self-cleaning antibacterial functional layer is greater than or equal to 150°, and the rolling angle of the self-cleaning antibacterial functional layer is less than or equal to 10°.

10. A display device, characterized in that: It comprises a display module and a polarizer as described in any one of claims 1 to 9, wherein the polarizer is at least arranged on the light-emitting side of the display module.

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