Optical film and preparation method thereof, polaroid and display device

Abstract

The invention relates to an optical film, a preparation method of the optical film, a polaroid and a display device. The optical film comprises a base material layer and a surface coating arranged on one side of the base material layer. The material of the surface coating comprises a cross-linked network structure formed by octa (3-glycidyl ether propyl) polyhedral oligomeric silsesquioxane; the pencil hardness of the surface coating is greater than 3H. The hardness of the surface coating in the optical film can be improved through a method which is simpler in manufacturing process, lower in cost and higher in yield, the hardness of the surface of the display device applying the optical film is effectively improved, and therefore the problem that the surface of the display device is prone to being damaged in the using process is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to an optical film, a preparation method thereof, a polarizer and a display device. BACKGROUND

[0002] With the progress of the times, liquid crystal televisions as display terminals go from homes to conference rooms, classrooms, and shopping malls. In this use scenario, consumers will use their fingers, various pens, plastic sticks, metals, and other objects to touch the television screen, leaving marks on the screen. When the hardness of the screen surface layer is not enough, it will cause scratches or abrasions on the screen.

[0003] Generally, the polarizer is an important component of the liquid crystal display panel, which can be directly contacted by consumers. Since the pencil hardness of the surface coating of the currently mass-produced polarizer is at most 3H, some metals or glass will damage the surface coating of the polarizer after light touch.

[0004] Therefore, it is necessary to improve the material of the surface coating to improve the hardness of the surface coating. SUMMARY

[0005] The embodiments of the present application provide an optical film, a preparation method thereof, a polarizer and a display device, which can improve the hardness of the surface coating in the optical film by a method with simpler process, lower cost and higher yield, so that the hardness of the surface of the display device using the optical film is effectively improved, thereby improving the problem that the surface of the display device is easily damaged during use.

[0006] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, an optical film is provided, which comprises a substrate layer and a surface coating arranged on one side of the substrate layer; the material of the surface coating comprises a cross-linked network structure formed by octa(3-glycidyloxypropyl)silsesquioxane; the pencil hardness of the surface coating is greater than 3H.

[0007] Optionally, the material of the surface coating further comprises an anti-fouling agent, and the water droplet contact angle of the surface coating is greater than or equal to 120°.

[0008] Optionally, the material of the surface coating further comprises an anti-glare agent, and the haze of the surface coating ranges from 1 to 50.

[0009] Optionally, the thickness of the surface coating ranges from 0.5 microns to 100 microns.

[0010] Optionally, the light transmittance of the surface coating is greater than or equal to 88%.

[0011] According to the second aspect of the present application, a preparation method of an optical film is provided, which comprises the following steps:

[0012] The coating material comprises octa(3-glycidyloxypropyl)silsesquioxane;

[0013] The coating material is coated on one side of a substrate layer to form a coated layer; and

[0014] The coated layer is subjected to a curing treatment to form a surface coating layer;

[0015] During the curing treatment, the octa(3-glycidyloxypropyl)silsesquioxane forms a crosslinked network structure.

[0016] Optionally, the coating material comprises the following raw materials in parts by weight:

[0017] Octa(3-glycidyloxypropyl)silsesquioxane: 70 to 99 parts;

[0018] Antifouling agent: 0.5 to 5 parts;

[0019] Photoinitiator: 0.01 to 1 part; and

[0020] Anti-glare agent: 0.1 to 20 parts.

[0021] Optionally, the antifouling agent is selected from any one or a combination of five fluoropropionic acid, tridecafluoroheptanoic acid and polydimethylsiloxane; and the anti-glare agent is selected from nano-silicon dioxide.

[0022] According to a third aspect of the present application, a polarizing sheet is provided, which comprises a polarizing functional layer and an optical film sheet, the optical film sheet being located on one side of the polarizing functional layer.

[0023] The optical film sheet is selected from the optical film sheets described above, or is made by the preparation method of the optical film sheets described above.

[0024] According to a fourth aspect of the present application, a display device is also provided, which comprises a display panel and the optical film sheet described above, the optical film sheet being located on the light-emitting side of the display panel, or the display device comprises the display panel and the polarizing sheet described above, the polarizing sheet being located on the light-emitting side of the display panel.

[0025] In the optical film sheet, the polarizing sheet and the display device provided by the embodiments of the present application, the material of the surface coating in the optical film sheet comprises a crosslinked network structure formed by octakis(3-glycidyloxypropyl)silsesquioxane (GPOSS), the ether group and the methylene group on the alkylene oxide functional group of the GPOSS have small steric hindrance by themselves, which endows the GPOSS with strong spatial movement ability, so that the GPOSS is easy to construct a complete polymer crosslinked network system through a simple and efficient photocatalytic ring-opening reaction, and the ring-opening reaction does not require harsh reaction conditions and a complicated preparation process, so that the preparation method of the surface coating is simple and easy to implement, which is conducive to reducing the production cost and improving the film yield. At the same time, the SiOx inorganic component in the polymer crosslinked network system formed by the GPOSS through polymerization and crosslinking reaction endows the surface coating with excellent wear resistance and hardness, so that the hardness of the surface coating is effectively improved, for example, the pencil hardness of the surface coating is greater than 3H, so that the hardness of the surface of the display device using the optical film sheet is effectively improved, which is conducive to reducing the damage of the surface of the display device during use. Therefore, the present application can improve the hardness of the surface coating in the optical film sheet through a method with simpler process, lower cost and higher yield, so that the hardness of the surface of the display device using the optical film sheet is effectively improved, thereby improving the problem that the surface of the display device is easily damaged during use.

[0026] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0028] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0029] Figure 1 is a structural schematic diagram of an optical film sheet provided by the embodiments of the present application;

[0030] Figure 2 is a flowchart of a preparation method of an optical film sheet provided by the embodiments of the present application;

[0031] Figure 3 is a structural schematic diagram of a polarizing sheet provided by the embodiments of the present application;

[0032] Figure 4 is a structural schematic diagram of another polarizing sheet provided by the embodiments of the present application;

[0033] Figure 5 is a structural schematic diagram of a display device provided by an embodiment of the present application;

[0034] Figure 6 is a structural schematic diagram of another display device provided by an embodiment of the present application.

[0035] Legend of reference signs:

[0036] 1, optical film; 2, base material layer; 3, surface coating layer; 4, polarizer; 5, polarizing functional layer; 6, first adhesive layer; 7, polarizing layer; 8, second adhesive layer; 9, compensation layer; 10, release film; 11, display device; 12, display panel; 13, lower polarizer; 14, backlight module. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0038] Generally, a liquid crystal display device is composed of a liquid crystal display panel, an upper polarizer arranged on the light-emitting side of the liquid crystal display panel, a lower polarizer arranged on the back of the liquid crystal display panel, and a backlight module arranged on the side of the lower polarizer away from the liquid crystal display panel. The surface coating layer in a common upper polarizer is an anti-glare layer composed of silicon dioxide and a resin anti-glare material or a low-reflection layer composed of silicon dioxide and a resin low-reflection material. However, the water droplet contact angle of the surface coating layer is generally 60° to 90°, the pencil hardness is less than or equal to 3H, and the surface coating layer has a certain hydrophilicity.

[0039] However, the pencil hardness of the surface coating layer is less than or equal to 3H, which leads to that the surface of the display device is more easily scratched or abraded during use. The water droplet contact angle of the surface coating layer is small and the surface coating layer has a certain hydrophilicity, which leads to that the surface of the display device has weak anti-fouling ability and self-cleaning ability, affecting the user experience.

[0040] In order to solve the above problems, the raw material of the surface coating layer is improved in the present application, octa(3-glycidyl ether propyl) cage silsesquioxane (GPOSS) is introduced into the raw material of the surface coating layer, which effectively improves the hardness of the surface coating layer; and an anti-fouling agent is introduced into the raw material of the surface coating layer, so that the surface coating layer exhibits excellent hydrophobicity / oil repellency, effectively improving the surface anti-fouling ability and self-cleaning ability of the surface coating layer; in addition, nano-sized silicon dioxide particles are introduced into the raw material of the surface coating layer, so that the surface coating layer has a certain haze, thereby having anti-glare function and low reflectivity, which can meet the use requirements in different environments. For details, refer to the description of the following embodiments.

[0041] As Figure 1As shown, the embodiment of the present application provides an optical film 1, which comprises a substrate layer 2 and a surface coating layer 3 arranged on one side of the substrate layer 2; the material of the surface coating layer 3 comprises a cross-linked network structure formed by octa(3-glycidyloxypropyl) cage silsesquioxane (GPOSS); the pencil hardness of the surface coating layer 3 is greater than 3H.

[0042] It can be understood that the material of the surface coating layer 3 comprises a polymer cross-linked network structure obtained by polymerization and cross-linking reaction of octa(3-glycidyloxypropyl) cage silsesquioxane, that is, octa(3-glycidyloxypropyl) cage silsesquioxane is a polymer monomer.

[0043] It should be noted that after GPOSS is cross-linked into a network structure, the siloxane skeleton itself remains stable.

[0044] Specifically, the ether group and the methylene group on the alkylene oxide functional group of GPOSS combine with their small steric hindrance, giving them strong spatial movement ability, making them easy to undergo simple and efficient photocatalytic ring-opening reaction to construct a complete polymer cross-linked network system, and the ring-opening reaction does not require harsh reaction conditions and complicated preparation process, so that the preparation method of the surface coating layer 3 is simple and easy to implement, which is conducive to reducing the production cost and improving the film yield.

[0045] At the same time, the SiOx inorganic component in the polymer cross-linked network system formed by GPOSS through polymerization and cross-linking reaction endows the surface coating layer 3 with excellent wear resistance and hardness, so that the hardness is effectively improved, for example, the pencil hardness of the surface coating layer is greater than 3H, so that the hardness of the surface of the display device using the optical film 1 is effectively improved, which is conducive to reducing or avoiding damage to the surface of the display device during use.

[0046] Therefore, the embodiment of the present application can improve the hardness of the surface coating layer 3 in the optical film 1 by a method with simpler process, lower cost and higher yield, so that the hardness of the surface of the display device using the optical film 1 is effectively improved, thereby improving the problem that the surface of the display device is easily damaged during use.

[0047] In some embodiments, the pencil hardness of the surface coating layer 3 is greater than or equal to 6H, indicating that the surface coating layer 3 containing the GPOSS cross-linked network structure has super-high hardness.

[0048] In some embodiments, the material of the surface coating layer 3 further comprises a photoinitiator for realizing the ring-opening reaction of octa(3-glycidyloxypropyl) cage silsesquioxane, thereby constructing a complete polymer cross-linked network system.

[0049] In some embodiments, the photoinitiator is an ultraviolet light (UV) initiator, such as a cationic photoinitiator. When the GPOSS is subjected to ultraviolet light curing, the epoxy groups thereof will undergo ring-opening under the action of the photoinitiator, and polymerization and crosslinking reactions will occur, forming a three-dimensional network structure of polysiloxane polymers.

[0050] In some embodiments, the photoinitiator is selected from at least one of a TPO initiator and a BPB initiator, but is not limited thereto.

[0051] Specifically, the TPO initiator is 2,4,6-trimethylbenzoyldiphenylphosphine oxide, which is a high-efficiency cleavage-type radical photoinitiator. The photolysis product is a trimethylbenzoyl radical and a diphenylphosphine radical, both of which have high initiation activity. The TPO initiator has the characteristics of high activity, low odor, non-yellowing, low volatility, good thermal stability, and high curing efficiency. The BPB initiator is prepared by Schiff base reaction using 4-aminobenzophenone as a raw material, and is a long-wavelength LED photoinitiator that can be well matched with an LED light source.

[0052] In some embodiments, the material of the surface coating 3 further comprises at least one of an anti-fouling agent and an anti-glare agent. The anti-fouling agent is used to improve the anti-fouling ability and self-cleaning ability of the surface coating 3, and the anti-glare agent is used to impart the surface coating 3 with anti-glare function.

[0053] In some embodiments, the material of the surface coating 3 further comprises an anti-fouling agent, and the water droplet contact angle of the surface coating 3 is greater than or equal to 120°, indicating that the surface coating 3 has excellent hydrophobicity / oil repellency, thereby having good surface anti-fouling ability and self-cleaning ability.

[0054] In some embodiments, the material of the surface coating 3 further comprises an anti-glare agent, and the haze of the surface coating 3 ranges from 1 to 50, indicating that the surface coating 3 has good anti-glare function and low reflectivity, and can replace conventional AG coatings or LR coatings.

[0055] In some embodiments, the coating used to make the surface coating 3 comprises the following raw materials in parts by weight:

[0056] Octakis(3-glycidyloxypropyl)cage silsesquioxane: 70 to 99 parts;

[0057] Anti-fouling agent: 0.5 to 5 parts;

[0058] Photoinitiator: 0.01 to 1 part; and

[0059] Anti-glare agent: 0.1 to 20 parts.

[0060] In some embodiments, the sum of the parts by weight of octakis(3-glycidyloxypropyl)cage silsesquioxane, anti-fouling agent, photoinitiator, and anti-glare agent is 100 parts.

[0061] In a preferred embodiment, the weight fraction of octa(3-glycidyloxypropyl) cage silsesquioxane in the raw material of the surface coating 3 is greater than 90 parts, which is conducive to increasing the content of octa(3-glycidyloxypropyl) cage silsesquioxane polymer, thereby effectively improving the hardness of the surface coating 3.

[0062] Of course, other additives can also be added to the raw material of the surface coating 3 according to functional needs, which are not limited in the present application.

[0063] In some embodiments, the material of the anti-fouling agent is selected from any one or a combination of five fluoropropionic acid, tridecafluoroheptanoic acid, and polydimethylsiloxane (PDMS). By introducing the anti-fouling agent, the surface coating 3 exhibits excellent hydrophobicity / oil repellency, effectively improving the surface anti-fouling ability and self-cleaning ability of the surface coating 3.

[0064] In some embodiments, the anti-glare agent is selected from nano-silicon dioxide, but is not limited thereto. By introducing nano-sized silicon dioxide particles, the surface coating 3 has a certain haze, thereby having an anti-glare function and low reflectivity, which can meet the use requirements of different environments. Therefore, the surface coating 3 provided in the embodiments of the present application can replace the conventional AntiGlare (AG) coating or Low Reflectivity (LR) coating.

[0065] It can be understood that the anti-glare agent can also be selected from other nano-sized particles, but nano-silicon dioxide has a lower cost and is easy to obtain, so the embodiments of the present application prefer to use nano-silicon dioxide as the anti-glare agent.

[0066] In some embodiments, the thickness of the surface coating 3 ranges from 0.5 microns to 100 microns.

[0067] In a preferred embodiment, the thickness of the surface coating 3 ranges from 20 microns to 100 microns.

[0068] For example, the thickness of the surface coating 3 is 0.5 microns, 1 micron, 2 microns, 3 microns, 4 microns, 5 microns, 6 microns, 7 microns, 8 microns, 9 microns, 10 microns, 20 microns, 30 microns, 40 microns, 50 microns, 60 microns, 70 microns, 80 microns, 90 microns, and 100 microns.

[0069] Applicants have found that setting the thickness of the surface coating 3 in the above range can effectively improve the hardness of the surface coating 3 without affecting the light transmission performance of the optical film 1 of the film layer.

[0070] In some embodiments, the surface coating layer 3 has a light transmittance greater than or equal to 88%, which means that the surface coating layer 3 has a high light transmittance, thereby reducing the light loss of the optical film 1 and improving the display brightness of the display device using the optical film 1.

[0071] In some embodiments, the material of the substrate layer 2 is selected from at least one of glass, poly(methyl methacrylate) (PMMA), poly(ethylene terephthalate) (PET), polycarbonate (PC), triacetyl cellulose (TAC), cyclic olefin polymer (COP), cyclic olefin copolymer (COC), and polyvinyl chloride (PVC), but is not limited thereto.

[0072] In a preferred embodiment, the material of the substrate layer 2 is selected from at least one of poly(methyl methacrylate), poly(ethylene terephthalate), and triacetyl cellulose.

[0073] In the embodiments of the present application, GPOSS is introduced into the raw material of the surface coating layer 3, which effectively improves the hardness of the surface coating layer 3 and makes the surface coating layer 3 have a high light transmittance; an anti-fouling agent is introduced into the raw material of the surface coating layer 3, which makes the surface coating layer 3 exhibit excellent hydrophobicity / oil repellency, effectively improving the surface anti-fouling ability and self-cleaning ability of the surface coating layer 3; in addition, nano-sized silicon dioxide particles are introduced into the raw material of the surface coating layer 3, which makes the surface coating layer 3 have a certain haze, thereby having an anti-glare function and low reflectivity.

[0074] Therefore, the embodiments of the present application can improve the hardness of the surface coating layer 3 in the optical film 1 by a method with simpler process, lower cost and higher yield, which effectively improves the hardness of the surface of the display device using the optical film 1, thereby improving the problem that the surface of the display device is easily damaged during use; at the same time, the surface coating layer 3 has good self-cleaning ability and anti-fouling ability, and has an anti-glare function and low reflectivity, which can meet the use requirements of different environments.

[0075] As shown in Figure 2 The embodiments of the present application also provide a preparation method of the optical film, which comprises the following steps:

[0076] S201, configuring a coating, wherein the coating comprises octakis(3-glycidyl ether propyl)cage silsesquioxane;

[0077] S202, coating the coating material on one side of the substrate layer to form a coating layer; and

[0078] S203, performing a curing treatment on the coating layer to form a surface coating layer; wherein during the curing treatment, the octa(3-glycidyloxypropyl)silsesquioxane forms a crosslinked network structure.

[0079] It should be noted that the coating method in step S202 is not limited in the embodiments of the present application, and the curing treatment method in step S203 includes ultraviolet curing method, but is not limited thereto.

[0080] It can be understood that the surface coating layer 3 in the optical film 1 provided by the embodiments of the present application can be formed by coating and UV curing, and the preparation method is simple, easy to implement and has high yield.

[0081] In some embodiments, the coating material in step S201 includes the following raw materials by weight:

[0082] Octa(3-glycidyloxypropyl)silsesquioxane: 70 to 99 parts;

[0083] Antifouling agent: 0.5 to 5 parts;

[0084] Photoinitiator: 0.01 to 1 part; and

[0085] Anti-glare agent: 0.1 to 20 parts.

[0086] In some embodiments, the sum of the weight parts of octa(3-glycidyloxypropyl)silsesquioxane, antifouling agent, photoinitiator and anti-glare agent in the coating material is 100 parts.

[0087] In some embodiments, the photoinitiator is selected from at least one of TPO initiator and BPB initiator, but is not limited thereto. The photoinitiator is used to achieve ring-opening reaction of octa(3-glycidyloxypropyl)silsesquioxane, thereby constructing a complete polymer crosslinked network system.

[0088] In a preferred embodiment, the weight parts of octa(3-glycidyloxypropyl)silsesquioxane in the coating material is greater than 90 parts, which is beneficial to increase the content of octa(3-glycidyloxypropyl)silsesquioxane polymer, thereby effectively improving the hardness of the surface coating layer.

[0089] Of course, other additives can also be added to the coating material according to functional needs, which is not limited in the present application.

[0090] In some embodiments, the material of the anti-fouling agent is selected from a combination of any one or more of pentafluoropropionic acid, tridecafluoroheptanoic acid and polydimethylsiloxane (PDMS). By introducing the anti-fouling agent, the surface coating exhibits excellent hydrophobic / oleophobicity, effectively improving the surface anti-fouling ability and self-cleaning ability of the surface coating.

[0091] In some embodiments, the anti-glare agent is selected from nano-silica, but is not limited thereto. By introducing nano-silica particles, the surface coating has a certain haze, thereby having an anti-glare function and low reflectivity, which can meet the use requirements of different environments.

[0092] It can be understood that the anti-glare agent can also be selected from other nano-scale particles, but nano-silica has a lower cost and is easy to obtain, so the embodiment of the present application preferably uses nano-silica as the anti-glare agent.

[0093] In some embodiments, the material of the substrate layer is selected from at least one of glass, PMMA, PET, PC, TAC, COP, COC and PVC, but is not limited thereto.

[0094] The performance of the optical film prepared in the embodiment of the present application is described in the foregoing embodiments, which will not be repeated here.

[0095] In the embodiment of the present application, the surface coating in the optical film can be formed by coating and UV curing, which is simple to prepare and easy to implement, and is conducive to reducing the production cost and improving the film yield. At the same time, the hardness of the surface coating of the optical film prepared is effectively improved, thereby improving the problem that the display device using the optical film is easily damaged in use. In addition, the surface coating has good self-cleaning ability and anti-fouling ability, and has an anti-glare function and low reflectivity, which can meet the use requirements of different environments.

[0096] The performance of the four optical films prepared from the raw materials of three different formulations in Embodiments 1 to 4 is tested and analyzed. The raw material formulations of the four optical films provided in Embodiments 1 to 4 are shown in Table 1, and the thickness and performance of the four optical films are shown in Table 2.

[0097] It can be understood that the four optical films provided in Embodiments 1 to 4 are all prepared by the foregoing preparation method. It should be noted that the parts of each component in Table 1 are parts by weight, and the total weight of the four materials is 100 parts.

[0098] Table 1

[0099]

[0100] As shown in Table 1, the materials of the anti-fouling agent, the photoinitiator and the anti-glare agent in Example 1 to Example 4 are the same, the weight fractions of the anti-fouling agent and the photoinitiator in Example 1 to Example 4 are the same, the weight fraction of GPOSS in Example 1 to Example 3 is the same, and the weight fractions of the anti-glare agent in Example 2 and Example 3 are the same.

[0101] Table 2

[0102]

[0103] As shown in Table 1 and Table 2, the raw materials of the surface coating provided by Example 2 and Example 3 are the same, but the thicknesses are different. As shown in Table 2, the comparison between Example 2 and Example 3, the greater the thickness of the surface coating, the higher the pencil hardness, while the haze, light transmittance and contact angle remain basically the same, which shows that the hardness of the surface coating can be improved by increasing the thickness of the surface coating.

[0104] As shown in Table 2, the pencil hardness of the surface coating of the four optical film layers provided by Example 1 to Example 4 is greater than or equal to 6H, and the highest can reach 9H, which shows that the hardness of the surface coating provided by the embodiments of the present application has been effectively improved, and even can reach super high hardness. The haze of the surface coating of the four optical film layers provided by Example 1 to Example 4 is in the range of 1 to 50, which shows that the surface coating provided by the embodiments of the present application can have different degrees of anti-glare function or low reflection performance. The light transmittance of the surface coating of the four optical film layers provided by Example 1 to Example 4 is greater than or equal to 88%, which shows that the surface coating provided by the embodiments of the present application has high light transmittance. The contact angle of the surface coating of the four optical film layers provided by Example 1 to Example 4 is greater than or equal to 120°, which shows that the surface coating provided by the embodiments of the present application has good self-cleaning ability and anti-fouling ability.

[0105] As shown in Table 1 and Table 2, the raw materials of the surface coating provided by Example 2 and Example 3 are the same, but the thicknesses are different. As shown in Table 2, the comparison between Example 2 and Example 3, the greater the thickness of the surface coating, the higher the pencil hardness, while the haze, light transmittance and contact angle remain basically the same, which shows that the hardness of the surface coating can be improved by increasing the thickness of the surface coating. Figure 1 and Figure 3 As shown in Table 1 and Table 2, the raw materials of the surface coating provided by Example 2 and Example 3 are the same, but the thicknesses are different. As shown in Table 2, the comparison between Example 2 and Example 3, the greater the thickness of the surface coating, the higher the pencil hardness, while the haze, light transmittance and contact angle remain basically the same, which shows that the hardness of the surface coating can be improved by increasing the thickness of the surface coating.

[0106] As shown in Table 1 and Table 2, the raw materials of the surface coating provided by Example 2 and Example 3 are the same, but the thicknesses are different. As shown in Table 2, the comparison between Example 2 and Example 3, the greater the thickness of the surface coating, the higher the pencil hardness, while the haze, light transmittance and contact angle remain basically the same, which shows that the hardness of the surface coating can be improved by increasing the thickness of the surface coating. Figure 2 and

[0107] In some embodiments, the polarizing functional layer 5 has oppositely arranged light-in side and light-out side, and the optical film piece 1 is located on the light-out side of the polarizing functional layer 5, so that the optical film piece 1 is located on the surface layer of the polarizing sheet 4.

[0108] In some embodiments, the polarizing functional layer 5 comprises a first adhesive layer 6, a polarizing layer 7, and a second adhesive layer 8, the first adhesive layer 6 and the second adhesive layer 8 are respectively located on opposite sides of the polarizing layer 7; the optical film sheet 1 is located on the side of the second adhesive layer 8 away from the polarizing layer 7, and the substrate layer 2 is located between the second adhesive layer 8 and the surface coating layer 3.

[0109] That is, the substrate layer 2 of the optical film sheet 1 is directly connected with the polarizing layer 7 through the second adhesive layer 8. This design enables the optical film sheet 1 to be integrated into the polarizing sheet 4, which is conducive to saving a layer of substrate layer. For example, the surface coating layer 3 described in the embodiments of the present application can be directly formed on the surface of the substrate layer of the light-emitting side of the conventional polarizing sheet through a coating and curing process.

[0110] Of course, in other embodiments, the polarizing sheet 4 further comprises another substrate layer located between the polarizing functional layer 5 and the optical film sheet 1, and the substrate layer 2 in the optical film sheet 1 is connected with the other substrate layer through another adhesive layer. That is, the optical film sheet 1 can be adhered to the conventional polarizing sheet through the adhesive layer.

[0111] In some embodiments, the material of the polarizing layer 7 is selected from polyvinyl alcohol (PVA), but is not limited thereto.

[0112] In some embodiments, the material of the first adhesive layer 6 and the second adhesive layer 8 is selected from pressure-sensitive adhesive, but is not limited thereto.

[0113] In some embodiments, as shown in Figure 4 the polarizing functional layer 5 further comprises a compensation layer 9 located between the first adhesive layer 6 and the polarizing layer 7. The compensation layer 9 can be a phase compensation layer or a viewing angle compensation layer, but is not limited thereto.

[0114] In some embodiments, the polarizing sheet 4 further comprises a release film 10 arranged on the side of the polarizing functional layer 5 away from the optical film sheet 1, and the release film 10 is removed when the polarizing sheet 4 is applied to the display device.

[0115] It can be understood that the polarizing sheet 4 provided by the embodiments of the present application can further comprise other functional film layers, which are not limited by the present application.

[0116] In the embodiments of the present application, since the surface layer of the polarizer 4 is the optical film 1 provided in the foregoing embodiments, and the surface coating layer 3 of the optical film 1 has the characteristics of high hardness, high light transmittance, high surface anti-fouling ability, high self-cleaning ability, anti-glare and low reflectivity, the surface of the polarizer 4 has the characteristics of high hardness, high surface anti-fouling ability, high self-cleaning ability, anti-glare and low reflectivity, and the polarizer 4 has high light transmittance. When the polarizer 4 is applied to the light-emitting side of the display device, the surface hardness, surface anti-fouling ability and self-cleaning ability of the display device can be improved without affecting the display brightness, and the surface of the display device has anti-glare and low reflectivity functions, avoiding the need to additionally provide an anti-glare layer and a low reflectivity layer on the surface of the display device, which is beneficial to simplify the process and reduce the overall thickness of the display device.

[0117] As shown in Figure 5 , the present application also provides a display device 11, which comprises a display panel 12 and the optical film 1 described above, and the optical film 1 is located on the light-emitting side of the display panel 12, or the display device 11 comprises the display panel 12 and the polarizer 4 described above, and the polarizer 4 is located on the light-emitting side of the display panel 12.

[0118] It can be understood that the optical film 1 can be directly provided on the surface of the light-emitting side of the display device 11, or can be applied to the surface of the light-emitting side of the display device 11 in cooperation with other protective layers (such as a cover plate).

[0119] In some embodiments, the display panel 12 described in the embodiments of the present application can also be an active display panel, such as an OLED display panel.

[0120] In another embodiment, as shown in Figure 6 , the display device 11 further comprises a lower polarizer 13 and a backlight module 14 arranged on the back of the display panel 12, and the lower polarizer 13 is located between the backlight module 14 and the display panel 12. At this time, the display panel 12 can be a liquid crystal display panel, but is not limited thereto.

[0121] It can be understood that the optical film 1 provided in the foregoing embodiments does not need to be arranged in the lower polarizer 13.

[0122] Of course, the type of display device 11 provided in the embodiments of the present application is not limited to the two types listed above.

[0123] In the embodiments of the present application, the surface coating 3 of the optical film 1 has high hardness, high light transmittance, high surface anti-fouling ability, high self-cleaning ability, anti-glare and low reflectivity, etc. When the optical film 1 is arranged on the surface of the light-emitting side of the display device 11, the hardness of the surface of the display device 11 can be improved without affecting the display brightness, and the surface of the display device 11 has anti-glare and low reflectivity functions, avoiding the need to additionally arrange an anti-glare layer and a low reflectivity layer on the surface of the display device 11, which is beneficial to simplify the process and reduce the overall thickness of the display device 11.

[0124] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0125] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0126] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0127] The above is only the preferred embodiments of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. An optical film, characterized in that, It includes a substrate layer and a surface coating disposed on one side of the substrate layer; the material of the surface coating includes a cross-linked network structure formed by octa(3-glycidyl ether propyl) cage-like silsesquioxane; the pencil hardness of the surface coating is greater than 3H.

2. The optical film according to claim 1, characterized in that, The surface coating material also includes an antifouling agent, and the water droplet contact angle of the surface coating is greater than or equal to 120°.

3. The optical film according to claim 1, characterized in that, The surface coating material also includes an anti-glare agent, and the surface coating has a haze range of 1 to 50.

4. The optical film according to any one of claims 1 to 3, characterized in that, The thickness of the surface coating ranges from 0.5 micrometers to 100 micrometers.

5. The optical film according to any one of claims 1 to 3, characterized in that, The light transmittance of the surface coating is greater than or equal to 88%.

6. A method for preparing an optical film, characterized in that, Includes the following steps: A coating is formulated, the coating comprising octa(3-glycidyl etherylpropyl) cage-like silsesquioxane; The coating is applied to one side of the substrate layer to form a coating layer; as well as The coating layer is cured to form a surface coating. During the curing process, octa(3-glycidyl ether propyl) cage-like silsesquioxane forms a cross-linked network structure.

7. The method for preparing an optical film according to claim 6, characterized in that, The coating comprises the following raw materials in parts by weight: octa(3-glycidyl etheryl propyl) cage-like silsesquioxane: 70 to 99 parts; Antifouling agent: 0.5 to 5 parts; Photoinitiator: 0.01 to 1 part; as well as Anti-glare agent: 0.1 to 20 parts.

8. The method for preparing an optical film according to claim 7, characterized in that, The antifouling agent is selected from any one or more combinations of pentafluoropropionic acid, tridecafluoroheptanoic acid and polydimethylsiloxane; the antiglare agent is selected from nano-silica.

9. A polarizer, characterized in that, It includes a polarizing functional layer and an optical film, wherein the optical film is located on one side of the polarizing functional layer; The optical film is selected from the optical films described in any one of claims 1 to 5, or the optical film is manufactured using the optical film preparation method described in any one of claims 6 to 8.

10. A display device, characterized in that, The display device includes a display panel and an optical film as described in any one of claims 1 to 5, wherein the optical film is located on the light-emitting side of the display panel; or, the display device includes the display panel and a polarizer as described in claim 9, wherein the polarizer is located on the light-emitting side of the display panel.

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