Optical films, polarizers and display devices

Abstract

This application discloses an optical film, a polarizer, and a display device. The material of the optical film includes resin and a surface modifier, wherein the surface modifier contains polar groups, and the surface energy of the optical film is greater than or equal to 42 dynes / cm. This application increases the content of polar components on the surface of the optical film by adding a surface modifier containing polar groups to the resin substrate of the optical film, thereby significantly improving the surface energy of the optical film (≥42 dynes / cm), and thus achieving processing stability and reliability between the surface of the optical film and other functional film layers.

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] Polarizers are the core optical components of display panels. The core layer of a polarizer, which performs the polarization function, is typically a polyvinyl alcohol (PVA) film that has been stretched and adsorbed with dichroic dyes or iodine molecules. Because PVA films are highly hygroscopic, prone to shrinkage, and have extremely poor mechanical strength, substrate films must be attached to both sides to provide physical support and environmental barriers. In traditional polarizer structures, triacetyl cellulose (TAC) films have long dominated the polarizer substrate film. However, with the development of display panels towards larger sizes, ultra-thinner designs, and harsher application environments (such as automotive displays and outdoor high-brightness commercial displays), the high water absorption and moisture permeability of TAC films, which are prone to dimensional deformation in high-temperature and high-humidity environments, leading to polarizer warping or light leakage, are becoming increasingly prominent defects.

[0003] Poly(methyl methacrylate) (PMMA) films are gradually becoming one of the high-end optical film materials to replace TAC due to their excellent dimensional stability, superior optical properties, high hardness, and strong weather resistance. However, in terms of physicochemical properties, although the side groups of the PMMA molecular chain contain polar ester groups, the overall polarity is still weak, and its surface energy is relatively low.

[0004] In practical applications of polarizers, the outermost substrate film typically requires advanced functional surface coatings, such as anti-glare, low-reflection, high-hardness scratch resistance, and anti-fingerprint treatments. Only when the surface energy of the substrate is significantly greater than the surface tension of the coating liquid can the coating achieve good spreading and wetting on the substrate surface. However, PMMA films, due to their relatively low surface energy, face significant technical challenges in these advanced surface coating processes. Summary of the Invention

[0005] This application provides an optical film, a polarizer, and a display device to enhance the surface energy of the optical film and improve the processing stability and reliability between the surface of the optical film and other functional film layers.

[0006] This application provides an optical film, the material of which includes resin and a surface modifier; wherein the surface modifier contains polar groups, and the surface energy of the optical film is greater than or equal to 42 dynes / cm.

[0007] In some embodiments, the polar group includes at least one selected from carboxyl, anhydride, carbonate, acetate, propionate, ester, hydroxyl, silanol, and aluminum hydroxyl groups.

[0008] In some embodiments, the surface modifier includes at least one of organic modifiers and inorganic modifiers; The organic modifier has an acid value greater than or equal to 20 mgKOH / g and a weight-average molecular weight greater than or equal to 100,000. The absolute value of the difference between the refractive index of the inorganic modifier and the refractive index of the resin is less than or equal to 0.05.

[0009] In some embodiments, the organic modifier includes at least one of modified methyl methacrylate, polyacrylic acid resin, styrene-maleic anhydride copolymer, ethylene-acrylic acid copolymer, polycarbonate, cellulose acetate propionate, and cellulose acetate butyrate. And / or, the inorganic modifier includes at least one of nano-silica, nano-alumina, nano-montmorillonite, and nano-organosilicon; And / or, the resin comprises polymethyl methacrylate.

[0010] In some embodiments, the optical film includes a base layer and a coating located on at least one side of the base layer; wherein the material of the base layer includes the resin, and the material of at least one of the base layer and the coating includes the surface modifier.

[0011] In some embodiments, the optical film has opposing first and second surfaces in the thickness direction of the optical film; wherein the surface modifier is distributed in the base layer on the side near the first surface and / or on the side of the base layer near the second surface.

[0012] In some embodiments, the transmittance of the optical film is greater than or equal to 92%; And / or, the haze of the optical film is less than or equal to 1%; And / or, the tensile strength of the optical film is greater than or equal to 65 MPa; And / or, the elongation at break of the optical film is greater than or equal to 3%.

[0013] This application also provides a polarizer, the polarizer comprising: polarization layer; and The optical film described above is disposed on at least one side of the polarization layer.

[0014] In some embodiments, the polarizer further includes a functional film layer disposed on the side of the optical film away from the polarizing layer; wherein the functional film layer includes at least one of an anti-glare layer, an anti-reflection layer, an anti-scratch layer, and an anti-fingerprint layer.

[0015] This application also provides a display device, the display device comprising: Display panel; and The polarizer described above is disposed on at least one side of the display panel.

[0016] This application provides an optical film, a polarizer, and a display device. The optical film of this application is made of resin and a surface modifier, wherein the surface modifier contains polar groups, and the surface energy of the optical film is greater than or equal to 42 dynes / cm. This application increases the content of polar components on the surface of the optical film by adding a surface modifier containing polar groups to the resin substrate of the optical film, thereby significantly improving the surface energy of the optical film (≥42 dynes / cm), and thus achieving processing stability and reliability between the surface of the optical film and other functional film layers. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the structure of an optical film provided in an embodiment of this application; Figure 2 This is a schematic diagram of another optical film structure provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a polarizer provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a display device provided in an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures: 10. Display device; 100. Polarizer; 110. Optical film; 111. Substrate; 111a. First surface; 111b. Second surface; 112. Coating; 112a. First coating; 112b. Second coating; 120. Polarizing layer; 130. Functional film layer; 140. Compensation layer; 150. First adhesive layer; 160. Second adhesive layer; 170. Release layer; 200. Display panel. Detailed Implementation

[0020] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0021] This application provides an optical film 110, the material of which includes resin and surface modifier; wherein the surface modifier contains polar groups, and the surface energy of the optical film 110 is greater than or equal to 42 dynes / cm.

[0022] It is understood that by adding a surface modifier containing polar groups to the resin substrate of the optical film 110, this application can significantly improve the surface energy of the optical film 110 (≥42 dynes / cm), thereby achieving processing stability and reliability between the optical film 110 and other functional film layers 130. During the preparation of the optical film 110 (such as melt extrusion, casting, or coating drying), the surface modifier containing polar groups tends to migrate to the film surface, exposing the polar groups at the film interface. Due to the significant increase in the polar component of the film surface, the surface energy (surface tension) of the optical film 110 is increased. The surface energy of the optical film 110 in this application is ≥42 dynes / cm, which can significantly improve the spreading and wetting properties of the optical film 110 surface, and greatly enhance the interfacial adhesion strength and reliability between the optical film 110 and other functional film layers 130.

[0023] In some embodiments, the resin comprises polymethyl methacrylate (PMMA). It is understood that PMMA, as the substrate of the optical film 110, has many advantages: on the one hand, PMMA has extremely low water absorption and maintains good dimensional stability even under extreme testing conditions such as high temperature and high humidity (e.g., 85°C / 85% RH), effectively preventing PVA film shrinkage when applied to the polarizer 100; on the other hand, PMMA has extremely high visible light transmittance and extremely low haze, and its own low birefringence is beneficial for achieving phase-difference-free optical properties; furthermore, PMMA has better surface hardness than TAC film, strong scratch resistance, and excellent ultraviolet (UV) resistance and aging resistance, extending its service life. Therefore, the optical film 110 using PMMA as the substrate has excellent comprehensive performance, and when applied to the polarizer 100, it can significantly improve the stability, reliability, and lifespan of the polarizer 100.

[0024] However, PMMA exhibits weak polarity and has low surface energy. Therefore, this application can compensate for the low surface energy of PMMA by introducing a surface modifier containing polar groups into the PMMA substrate, thereby improving the surface energy of the optical film 110 and achieving processing stability and reliability between the optical film 110 and other functional film layers 130.

[0025] In some embodiments, the polar groups include at least one selected from carboxyl groups, anhydride groups (such as cyclic anhydride groups), carbonate groups, acetate groups, propionate groups, ester groups, hydroxyl groups, silanol groups, and aluminum hydroxyl groups. By introducing a surface modifier containing the above-mentioned polar groups into the resin substrate of the optical film 110, the polar component of the optical film 110 material can be significantly increased, thereby increasing the surface energy of the optical film 110.

[0026] In some embodiments, the surface modifier includes at least one of an organic modifier and an inorganic modifier. For example, the material of the optical film 110 may contain an organic modifier, or contain an inorganic modifier, or contain both an organic modifier and an inorganic modifier. Here, an organic modifier refers to a surface modifier that is an organic material, and an inorganic modifier refers to a surface modifier that is an inorganic material.

[0027] In some embodiments, the acid value of the organic modifier is greater than or equal to 20 mgKOH / g. It is understood that a higher acid value indicates a greater number of acidic polar groups such as carboxyl groups (-COOH) in the system. These acidic polar groups have strong dipole and hydrogen bonding effects, increasing the polar component of the material's surface energy. This reduces the contact angle of the optical film 110 surface, improves wettability and adhesion, and makes it easier for water or polar functional coatings to spread on the film surface. When the acid value of the surface modifier is <20, the above effects cannot be achieved.

[0028] In some embodiments, the weight-average molecular weight (M) of the organic modifier w The molecular weight of the organic modifier is greater than or equal to 100,000. Understandably, the organic modifier is a high-molecular-weight organic compound with a molecular weight ≥ 100,000 and relatively long molecular chains, possessing a certain entanglement ability. This allows the surface modifier to migrate gradient within the film layer, improving both the surface energy of the optical film 110 and ensuring its overall mechanical properties. When the molecular weight of the organic modifier is too small (< 100,000), molecular entanglement is weakened, affecting the mechanical properties of the optical film 110.

[0029] In some embodiments, the organic modifier includes, but is not limited to, at least one of modified methyl methacrylate, poly(methyl acrylate) (PMA), poly(styrene-maleic anhydride) (SMA), ethylene-methacrylic acid copolymer (EMAA), polycarbonate (PC), cellulose acetate propionate (CAP), and cellulose acetate butyrate (CAB).

[0030] Modified methyl methacrylates include, but are not limited to, methyl methacrylate-methyl methacrylate copolymer (PMMA-co-MAA) and maleic anhydride-grafted methyl methacrylate (PMMA-g-MAH).

[0031] In some embodiments, the absolute value of the difference between the refractive index of the inorganic modifier and the refractive index of the resin is less than or equal to 0.05. It is understood that the refractive index of the inorganic modifier is close to that of the resin (PMMA) to avoid problems such as reduced light transmittance, increased haze, and decreased contrast caused by a mismatch between the refractive indices of the inorganic modifier and the resin (PMMA).

[0032] The refractive index of the resin is approximately 1.49, and the refractive index of the inorganic modifier ranges from 1.44 to 1.54. For example, the refractive index of the inorganic modifier can be 1.44, 1.45, 1.46, 1.47, 1.48, 1.49, 1.50, 1.51, 1.52, 1.53, or 1.54, but is not limited to these.

[0033] In some embodiments, the inorganic modifier may be inorganic nanoparticles, including, but not limited to, at least one of nano-silica, nano-alumina, nano-montmorillonite, and nano-organosilicon. It is understood that the inorganic modifier of this application contains polar groups; for example, nano-alumina contains Al-OH, which has strong hydrophilicity and can improve the surface energy of the optical film 110.

[0034] In some embodiments, the surface modifier in the material of the optical film 110 has a mass percentage content ranging from 0.5% to 50%. This means that, with the total mass of the resin and the surface modifier being 100%, the surface modifier accounts for 0.5% to 5% of the total mass of the resin and the surface modifier; for example, the mass percentage content of the surface modifier can be 0.5%, 1%, 10%, 20%, 30%, 40%, or 50%, etc., but is not limited to these. It is understood that a surface modifier content within the above range can effectively improve the surface energy of the optical film 110 while maintaining its excellent optical properties such as high light transmittance and low haze.

[0035] In some embodiments, the optical film 110 can be prepared by processes such as melt extrusion and biaxial stretching. This application introduces a surface modifier containing polar groups into a PMMA resin substrate. During melt extrusion and biaxial stretching, the polar components spontaneously accumulate on the film surface, significantly increasing the surface energy and enabling excellent coating and strong adhesion of high-end functional film coatings. Simultaneously, it retains the original high transmittance and low haze of PMMA, providing excellent optical properties. Furthermore, it effectively improves the tensile toughness and processing stability of the material, which is beneficial for the processing and application of the downstream polarizer 100.

[0036] When the material of the optical film 110 includes PMMA resin and organic modifier, there is compatibility and surface energy difference between the organic modifier and the PMMA substrate. During high-temperature processing such as melt extrusion and biaxial stretching, the molecular chain segment mobility of the organic modifier is enhanced, and it gradually migrates and accumulates to the film surface under the driving effect of interfacial energy, thereby changing the surface properties of the PMMA film and improving the surface energy of the optical film 110.

[0037] When the material of the optical film 110 includes PMMA resin and inorganic modifier, the inorganic modifier (such as inorganic particles) has significantly higher rigidity and dimensional stability than the PMMA substrate. During biaxial stretching, the PMMA substrate deforms and gradually thins along the stretching direction, while the size and shape of the inorganic particles change less. When the inorganic particles are distributed on the surface or near the surface of the film, the surrounding substrate thins, causing the inorganic particles to form microscopic protrusions relative to the film surface, thereby changing the surface properties of the PMMA film and improving the surface energy of the optical film 110.

[0038] In some embodiments, please refer to Figure 1 The optical film 110 includes a base layer 111 and a coating 112 (primer) located on at least one side of the base layer 111; wherein the material of the base layer 111 includes resin and surface modifier, that is, the surface modifier is distributed in the base layer 111.

[0039] In some embodiments, please refer to Figure 1In the thickness direction of the optical film 110, the base layer 111 has a first surface 111a and a second surface 111b opposite to each other; wherein, the surface modifier is distributed (or enriched) on the side near the first surface 111a, or the surface modifier is distributed (or enriched) on the side near the second surface 111b, or the surface modifier is partially distributed (or enriched) on the side near the first surface 111a and partially distributed (or enriched) on the side near the second surface 111b.

[0040] Enrichment refers to a higher concentration of surface modifier, meaning that in the thickness direction of the optical film 110, the concentration of surface modifier in a region of a certain thickness near the first surface 111a and / or the second surface 111b is greater than the concentration of surface modifier in the middle region of the optical film 110, which is located between the first surface 111a and the second surface 111b.

[0041] In some embodiments, the base layer 111 may include one or more membrane layers. For example, the base layer 111 may include one membrane layer, or two membrane layers stacked together, or three membrane layers stacked together, but is not limited thereto.

[0042] In some embodiments, please refer to Figure 1 The optical film 110 includes a first coating 112a, which is disposed on the side of the first surface 111a of the substrate 111 away from the second surface 111b.

[0043] In some embodiments, please refer to Figure 2 The optical film 110 also includes a second coating 112b, which is disposed on the side of the second surface 111b of the base layer 111 away from the first surface 111a.

[0044] It is understood that the aforementioned coating 112 includes a first coating 112a and / or a second coating 112b. That is, the optical film 110 may include only one of the first coating 112a and the second coating 112b, or it may include both the first coating 112a and the second coating 112b. The coating 112 is an organic resin (such as polyurethane, acrylic, etc.) film, mainly used to improve the wettability and adhesion of the PMMA film surface, enabling subsequent adhesive layers and functional film layers to bond firmly, reducing the risks of delamination, bubbling, and peeling.

[0045] In some embodiments, the optical film 110 further includes diffusing particles distributed in the base layer 111 and / or coating 112. The diffusing particles can achieve functions such as light homogenization, anti-glare, and haze adjustment through light scattering, thereby improving the optical performance of the optical film 110.

[0046] In some embodiments, when the surface modifier is an inorganic particle, the surface modifier in the base layer 111 can act as a diffusion particle, which has the effects of uniform light, anti-glare and haze adjustment.

[0047] In some embodiments, the transmittance of the optical film 110 is greater than or equal to 92%. The optical film 110 of this application can still maintain a high transmittance while adding the above-mentioned surface modifier to improve the surface energy.

[0048] In some embodiments, the haze of the optical film 110 is less than or equal to 1%. The optical film 110 of this application can still maintain a low haze while adding the above-mentioned surface modifier to increase the surface energy.

[0049] In some embodiments, the tensile strength of the optical film 110 is greater than or equal to 65 MPa, and the elongation at break of the optical film 110 is greater than or equal to 3%. The optical film 110 of this application, while adding the aforementioned surface modifier to enhance surface energy, also effectively improves the tensile toughness and processing stability of the optical film 110 material.

[0050] In some embodiments, the thickness of the optical film 110 is greater than or equal to 10 μm and less than or equal to 80 μm. For example, the thickness of the optical film 110 may be 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm or 80 μm, etc., but is not limited thereto.

[0051] The performance of the optical film 110 of this application will be further described below through specific embodiments, but the scope of protection of this application is not limited to the following embodiments.

[0052] This application provides comparative examples and Examples 1 to 6, wherein the material composition, film thickness, overall transmittance, haze, tensile strength, elongation at break and surface energy of the comparative examples and Examples 1 to 6 are detailed in Table 1.

[0053] Table 1

[0054] In Table 1, the percentage content (%) refers to the mass percentage content.

[0055] As shown in Table 1, compared to the optical film without surface modifier in the comparative example, the surface energy of the optical films 110 in Examples 1 to 6 of this application, which have surface modifiers added, is significantly improved, and the surface energy is ≥42 dynes / cm. Meanwhile, the optical films 110 in Examples 1 to 6 of this application still maintain excellent optical properties such as high light transmittance and low haze; in addition, they can also improve the tensile toughness and processing stability of the material.

[0056] This application also provides a polarizer 100, please refer to... Figure 3 The polarizer 100 includes a polarizing layer 120 and an optical film 110 as described above, with the optical film 110 disposed on at least one side of the polarizing layer 120.

[0057] In some embodiments, please refer to Figure 3 The polarizer 100 also includes a functional film layer 130, which is disposed on the side of the optical film 110 away from the polarizing layer 120. The functional film layer 130 includes at least one of an anti-glare (AG) layer, a low reflection (LR) layer, a hard coating (HC) layer, and an anti-fingerprint (AF) layer.

[0058] In some embodiments, the functional film layer 130 can be formed by a coating process. It is understood that the polarizer 100 of this application uses the optical film 110 as described above, which on the one hand can ensure the optical performance and weather resistance of the polarizer 100 and improve the service life of the polarizer 100, and on the other hand can also improve the interfacial adhesion with the functional film layer 130, which is beneficial to the stability and reliability of the process.

[0059] In some embodiments, the polarizing layer 120 is made of polyvinyl alcohol (PVA) and a dichroic dye. The dichroic dye can be an inorganic dye or an organic dye. Inorganic dyes include iodine (I2), potassium iodide (KI), or a combination thereof; organic dyes include anthraquinone dyes, azo dyes, triphenyldiazepine and its derivatives, monomethanone and polymethanone dyes, heterocyclic dyes, or combinations of the above-mentioned organic dyes, but are not limited thereto.

[0060] In some embodiments, the polarizer 100 further includes a compensation layer 140 disposed on at least one side of the polarizing layer 120 in the thickness direction of the optical film 110. For example, the compensation layer 140 may be disposed on the side of the polarizing layer 120 away from the optical film 110. The material of the compensation layer 140 may be cellulose triacetate (TAC), polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polycyclic olefins (such as cyclic olefin copolymers (COC) or cyclic olefin polymers (COP)), polyethylene naphthalate (PEN), etc., but is not limited thereto.

[0061] In some embodiments, please refer to Figure 3 The polarizer 100 also includes a first adhesive layer 150, which is disposed between the polarizing layer 120 and the compensation layer 140, and between the polarizing layer 120 and the optical film 110, to bond the upper and lower film layers. The material of the first adhesive layer 150 can be water-based adhesive, pressure-sensitive adhesive (PSA), radiation-cured adhesive, etc., but is not limited to these.

[0062] Among them, the material of water-based adhesive can be polyvinyl alcohol, the material of pressure-sensitive adhesive can be acrylate copolymer, and the material of radiation-cured adhesive can be multifunctional acrylate monomer, but is not limited to these.

[0063] In some embodiments, please refer to Figure 3 The polarizer 100 also includes a second adhesive layer 160, which is disposed on the side of the compensation layer 140 away from the polarizing layer 120. The material of the second adhesive layer 160 may be pressure-sensitive adhesive (PSA) or similar, but is not limited thereto.

[0064] The pressure-sensitive adhesive can be made of acrylate copolymer, but is not limited to this.

[0065] In some embodiments, the thickness of the second adhesive layer 160 is greater than or equal to 5 μm and less than or equal to 30 μm. For example, the thickness of the second adhesive layer 160 may be 5 μm, 10 μm, 15 μm, 20 μm, 25 μm or 30 μm, etc., but is not limited thereto.

[0066] In some embodiments, please refer to Figure 3 The polarizer 100 also includes a release layer 170, which is disposed on the side of the second adhesive layer 160 away from the compensation layer 140. The material of the release layer 170 includes polyethylene terephthalate (PET) and a release agent, wherein the release agent is coated on the surface of the polyethylene terephthalate substrate (the surface away from the second adhesive layer 160), but is not limited thereto.

[0067] In some embodiments, the thickness of the release layer 170 is greater than or equal to 20 μm and less than or equal to 100 μm. For example, the thickness of the release layer 170 may be 20 μm, 40 μm, 60 μm, 80 μm or 100 μm, etc., but is not limited thereto.

[0068] In some embodiments, the polarizer 100 has a polarization degree ≥ 99%. The polarizer 100 of this application has a high polarization degree, which can reduce light leakage in the orthogonal state, improve display contrast, improve gray fog and color shift in dark images, and suppress polarized stray light interference.

[0069] In some embodiments, the polarizer 100 has a transmittance of ≥40%. The polarizer 100 of this application maintains a high degree of polarization while also achieving a high transmittance.

[0070] This application also provides a display device 10, please refer to... Figure 4 The display device 10 includes a display panel 200 and a polarizer 100 as described above, wherein the polarizer 100 is disposed on at least one side of the display panel 200.

[0071] In some embodiments, please refer to Figure 4 The polarizer 100 is disposed on the light-emitting side of the display panel 200.

[0072] In some embodiments, the display panel 200 may be an organic light-emitting diode (OLED) display panel or a liquid crystal display (LCD) panel, but is not limited thereto.

[0073] In some embodiments, the display device 10 of this application may be a display product in the fields of smartphones, foldable terminals, smart wearables, VR / AR displays, televisions, automotive displays, commercial advertising displays, medical displays, industrial control screens, and flexible lighting.

[0074] This application provides an optical film, a polarizer, and a display device. The optical film of this application is made of resin and a surface modifier, wherein the surface modifier contains polar groups, and the surface energy of the optical film is greater than or equal to 42 dynes / cm. This application increases the content of polar components on the surface of the optical film by adding a surface modifier containing polar groups to the resin substrate of the optical film, thereby significantly improving the surface energy of the optical film (≥42 dynes / cm), and thus achieving processing stability and reliability between the surface of the optical film and other functional coatings.

[0075] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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, "multiple" means two or more, unless otherwise explicitly specified.

[0076] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0077] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0078] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. An optical film, characterized in that, The optical film is made of resin and a surface modifier; wherein the surface modifier contains polar groups and the surface energy of the optical film is greater than or equal to 42 dynes / cm.

2. The optical film according to claim 1, characterized in that, The polar groups include at least one of carboxyl, anhydride, carbonate, acetate, propionate, ester, hydroxyl, silanol, and aluminum hydroxyl.

3. The optical film according to claim 1, characterized in that, The surface modifier includes at least one of organic modifiers and inorganic modifiers; The organic modifier has an acid value greater than or equal to 20 mgKOH / g and a weight-average molecular weight greater than or equal to 100,000. The absolute value of the difference between the refractive index of the inorganic modifier and the refractive index of the resin is less than or equal to 0.

05.

4. The optical film according to claim 3, characterized in that, The organic modifier includes at least one of modified methyl methacrylate, polyacrylic acid resin, styrene-maleic anhydride copolymer, ethylene-acrylic acid copolymer, polycarbonate, cellulose acetate propionate, and cellulose acetate butyrate. And / or, the inorganic modifier includes at least one of nano-silica, nano-alumina, nano-montmorillonite, and nano-organosilicon; And / or, the resin includes polymethyl methacrylate.

5. The optical film according to claim 1, characterized in that, The optical film includes a base layer and a coating located on at least one side of the base layer; wherein the material of the base layer includes the resin and the surface modifier.

6. The optical film according to claim 5, characterized in that, In the thickness direction of the optical film, the substrate has a first surface and a second surface opposite to each other; wherein the surface modifier is distributed in the substrate on the side near the first surface and / or on the side of the substrate near the second surface.

7. The optical film according to any one of claims 1 to 6, characterized in that, The transmittance of the optical film is greater than or equal to 92%; And / or, the haze of the optical film is less than or equal to 1%; And / or, the tensile strength of the optical film is greater than or equal to 65 MPa; And / or, the elongation at break of the optical film is greater than or equal to 3%.

8. A polarizer, characterized in that, include: Polarizing layer; as well as The optical film as described in any one of claims 1 to 7 is disposed on at least one side of the polarization layer.

9. The polarizer according to claim 8, characterized in that, The polarizer further includes a functional film layer disposed on the side of the optical film away from the polarizing layer; wherein the functional film layer includes at least one of an anti-glare layer, an anti-reflection layer, an anti-scratch layer, and an anti-fingerprint layer.

10. A display device, characterized in that, include: Display panel; as well as The polarizer as described in claim 8 or 9 is disposed on at least one side of the display panel.

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