High-haze polaroid for VA (vertical alignment) and UV (ultraviolet) curing preparation method of high-haze polaroid

Abstract

The invention discloses a high-haze polaroid for VA and a UV curing preparation method thereof, and belongs to the technical field of polaroids. The preparation method comprises the steps that an anti-glare base material film with a haze enhancing function is adopted as an upper-layer supporting film; a polyvinyl alcohol film is subjected to directional stretching, dyeing and cross-linking treatment; the anti-dazzle base material film is attached to a polarization function layer, and a protection film is attached to the other face of the anti-dazzle base material film to form a three-layer structure; in the attaching process, an ultraviolet curing type adhesive is adopted, illumination curing is carried out, surface treatment and size cutting are carried out on the obtained composite film, and the polarizer meeting the size VA mode requirement is obtained; according to the invention, the haze structure is formed by adopting a mold pressing microstructure or a particle coating mode, so that the haze uniformity is better, and light spots and light leakage are avoided; the ultraviolet curing mode does not need heating, and the laminating process is low-temperature, environmentally friendly, energy-saving and efficient; the optical performance of the adhesive layer is optimized, and the overall polarization consistency and image quality performance are improved; the structural design meets the requirements of VA liquid crystal high contrast and wide viewing angle.

Description

Technical Field

[0001] The present invention relates to a high haze polarizer for VA and a method for preparing the same by UV curing, belonging to the technical field of polarizers. Background Art

[0002] As a core optical component of liquid crystal displays, the performance of polarizers directly affects the display effect. Traditional polarizers are mainly composed of a polyvinyl alcohol film that is stretched, dyed, and then laminated with a triacetyl cellulose film. This structure performs well in a conventional environment, but has obvious deficiencies in large-size displays and outdoor application scenarios. In the prior art, the production of large-size polarizers is limited by the width, and it is difficult to meet the requirements of ultra-large-size displays such as 105 inches. At the same time, the traditional TAC protective layer structure is prone to problems such as moisture absorption deformation and deterioration of optical performance in outdoor high-temperature and high-humidity environments. In addition, the anti-glare ability of ordinary polarizers is limited, and the display effect is poor in strong light environments. The conventional polarizer preparation process uses a water-based adhesive thermal curing method, which has disadvantages such as low drying efficiency, high energy consumption, and long production cycle, and it is difficult to meet the bonding requirements of hydrophobic materials. In terms of haze control, the prior art is difficult to balance the contradictory requirements of high haze anti-glare and high transmittance, and usually requires a trade-off between optical performance and anti-glare effect. In view of the above problems, the prior art urgently needs to be improved. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, the existing To solve the above technical problems, the present invention is implemented by the following technical solutions: Provide a method for preparing a high haze polarizer for VA by UV curing, including the following steps: Including the following steps: Use an anti-glare substrate film with a haze enhancement function as the upper support film; Prepare a polarizing functional layer, which is formed by subjecting a polyvinyl alcohol film to orientation stretching, dyeing, and cross-linking treatment; Bond the anti-glare substrate film to the polarizing functional layer, and bond a protective film on the other side to form a three-layer structure; During the bonding process, use an ultraviolet curable adhesive and perform light curing, Perform surface treatment and size cutting on the obtained composite film to obtain a polarizer that meets the size requirements of the VA mode.

[0004] Furthermore, the anti-glare substrate film forms a haze layer by embossing microstructures or coating dispersed particles. The haze layer has randomly distributed microstructures. The particle size of the atomization structure of the high haze film is between 0.5 μm and 5 μm, and the haze is in the range of 20% - 30%.

[0005] Further, the polyvinyl alcohol film is subjected to humidity adjustment treatment before stretching, the stretching ratio is controlled during stretching, and iodine staining treatment is carried out after stretching, and then crosslinked with a boron-containing solution to enhance its hydrothermal stability.

[0006] Further, the laminating process uses an ultraviolet curable adhesive for bonding. The adhesive cures under light conditions and forms a bonding layer with high adhesion and transparency between the two films.

[0007] Further, the surface treatment of the obtained composite film includes applying an anti-scratch coating to the surface of the polarizer after lamination.

[0008] In a second aspect, a high haze polarizer for VA is prepared by UV curing the preparation method of the high haze polarizer for VA mentioned in the first aspect, and includes a three-layer structure of an anti-glare functional film, a polarizing layer, and a protective film laminated in sequence, wherein: The anti-glare functional film has a light scattering structure for increasing the haze and suppressing specular reflection; The polarizing layer is a polyvinyl alcohol film that has been stretched, dyed, and crosslinked; The protective film is laminated to the polarizing layer through an adhesive layer for providing mechanical support and environmental protection.

[0009] Further, the surface of the anti-glare functional film has a micro-convex structure.

[0010] Further, an optically matched adhesive layer is provided between the polarizing layer and the anti-glare functional film, and the adhesive layer has the characteristics of low birefringence and high light transmittance.

[0011] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: In the present invention, the haze structure is formed by means of embossing micro-structure or particle coating, and the haze uniformity is better, avoiding light spots and light leakage; the UV curing method does not require heating, and the laminating process is environmentally friendly at low temperature, energy-saving and efficient; the optical performance of the adhesive layer is optimized, improving the overall polarization consistency and image quality performance; the structural design meets the requirements of high contrast and wide viewing angle of VA liquid crystal, taking into account anti-glare and low reflection. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Shown is the overall flow chart provided by the present invention; Figure 2 Shown is the UV curing schematic diagram provided by the present invention; Figure 3 Shown is the UV curing principle provided by the present invention; Figure 4 Shown is the corona process flow chart provided by the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0013] The present invention will be further described in detail below in conjunction with specific embodiments and the accompanying drawings of the specification. Unless otherwise specified, the experimental methods described in the present invention are all conventional methods; the materials used can be obtained from commercial channels. Example 1:

[0014] As Figure 1 shown, the present application provides a method for UV curing the preparation of a high haze polarizer for VA, including the preparation method proposed in the present application, which comprises the following steps: using an anti-glare substrate film with a haze enhancement function as the upper support film; preparing a polarizing functional layer formed by subjecting a polyvinyl alcohol film to orientation stretching, dyeing, and crosslinking treatment; laminating the anti-glare substrate film with the polarizing functional layer, and laminating a protective film on the other side to form a three-layer structure; using an ultraviolet curable adhesive during the lamination process and performing light curing; performing surface treatment and size cutting on the obtained composite film to obtain a polarizing plate that meets the size requirements.

[0015] Among them, the anti-glare substrate film controls the light scattering path through the surface microstructure, and specifically can be achieved by means of a molding process to form concave-convex textures or by coating dispersed particles. Its microscopic structure distribution directly affects the balance of the haze value and the light transmittance. The stretching treatment of the polyvinyl alcohol film improves the polarization efficiency through the orientation of molecular chains. The humidity control during the stretching process can avoid embrittlement of the film material. The crosslinking treatment enhances the structural stability through chemical bonding. The ultraviolet curable adhesive activates the polymerization reaction through a photoinitiator, and its curing speed can be adjusted by the light source intensity and irradiation time to achieve rapid interlayer bonding. The surface treatment process improves the abrasion resistance of the finished product by coating a protective layer, and the cutting process uses a precision positioning system to ensure the dimensional accuracy.

[0016] Specifically, first, a substrate film with a specific surface morphology is selected, and a micron-level scattering structure is formed by roll pressing or spraying. The polyvinyl alcohol film is subjected to multi-stage stretching in a constant temperature and humidity environment, and the stretching direction is kept consistent with the polarization axis. Subsequently, it is immersed in a dyeing solution to form dichroism. The crosslinking treatment uses boric acid solution penetration to form a bridging structure between molecules. During interlayer lamination, the ultraviolet adhesive immediately receives high-intensity ultraviolet irradiation after coating to achieve second-level curing. Finally, the interface bubbles are eliminated by roll pressing and leveling, and defective products are removed by optical inspection before cutting.

[0017] Through the above technical solutions, the present application realizes efficient continuous production, significantly reduces equipment energy consumption and site occupation. The innovation of the curing process effectively avoids adhesive layer defects and improves the product yield. The structural design of the substrate film maintains a high light transmittance while ensuring the anti-glare effect, meeting the optical requirements of outdoor displays. The simplification of the overall process reduces the production cost of large-size products and lays a foundation for the mass production of ultra-wide polarizers.

[0018] The present application further proposes that the anti-glare substrate film forms a haze layer by molding a microstructure or coating dispersed particles, the haze layer has a randomly distributed microstructure, the particle size of the haze structure of the high haze film is between 0.5μm and 5μm, and the haze is in the range of 20%~30%.

[0019] Among them, the molded microstructure refers to the formation of regular or irregular microscopic geometric forms on the surface of the substrate by physical embossing. Specifically, it can be achieved by hot pressing the substrate with a roller mold with a preset pattern. This microstructure realizes light scattering by changing the propagation path of light. Among them, coating dispersed particles refers to the uniform dispersion of nanometer or micrometer particles with light scattering function in the coating liquid to form a functional layer. Specifically, it can be achieved by mixing silica or acrylic resin particles with solvents and applying them to the surface of the substrate by roller coating. The disordered arrangement of particles can produce diffuse reflection effects. Among them, the randomly distributed microstructure refers to the surface morphology showing non-periodic arrangement characteristics. Specifically, it can be achieved by controlling the random parameters of the mold texture or adjusting the dispersion uniformity of the particles during the coating process to avoid optical defects such as interference fringes. Among them, the atomized structure particle size between 0.5μm and 5μm means that the scattering unit size range is between the order of visible light wavelength. Specifically, it can be achieved by controlling the particle size distribution of the particles through a screening process or adjusting the engraving accuracy of the molded mold. This size range can effectively scatter the incident light without excessively reducing the transmittance. Among them, the haze in the range of 20% to 30% refers to the material's scattering ability to incident light, which can be achieved by adjusting the microstructure density or the concentration of dispersed particles. This range can both suppress specular reflection and maintain sufficient light transmittance.

[0020] Specifically, when preparing the anti-glare substrate film, a polyester or polycarbonate transparent film is selected as the base material. When the molding process is used, a metal mold with random concave and convex patterns is used to heat-press the substrate at a temperature of 150-180°C to form a microstructure with a depth of 2-8μm; when the coating process is used, silica particles with a particle size of 0.5-5μm are dispersed in a UV curing resin at a concentration of 10-15wt%, and a haze layer with a thickness of 5-15μm is formed by slit coating. Both processes precisely control the height difference of the microstructure or the particle distribution density to stabilize the haze value in the range of 22-28%, and the surface roughness Ra value is controlled in the range of 0.2-0.8μm, ensuring that the light is refracted and reflected multiple times in the film layer to form a uniform diffuse scattering effect.

[0021] Through the above technical solutions, the present application can effectively suppress specular reflection and glare phenomena in outdoor strong light environments, while maintaining the high contrast and color restoration of the display screen. By optimizing the microstructure parameters and particle distribution, the incident light forms uniform scattering within the anti-glare layer, avoiding the generation of local over-brightness or dark spots, and is particularly suitable for the outdoor display requirements of 105-inch extra-large size VA liquid crystal panels. This haze control technology is also compatible with the subsequent preparation process of the polarizer layer, ensuring the optical performance consistency of the multi-layer composite structure.

[0022] The present application further proposes that the polyvinyl alcohol film is subjected to humidity adjustment treatment before stretching, the stretching ratio is controlled during the stretching process, and iodine staining treatment is carried out after stretching, and then cross-linked with a boron-containing solution to enhance its hydrothermal stability.

[0023] As Figure 2 and Figure 3 shown, the humidity adjustment treatment refers to adjusting the moisture content of the polyvinyl alcohol film before stretching. Specifically, steam balance or a humidity control box can be used for uniform humidification to make the film material in a preset humidity range, ensuring the uniformity of the molecular chain orientation during stretching and avoiding stretching rupture caused by local water content differences. Among them, the stretching ratio control refers to adjusting the extension ratio of the film material through a multi-stage tension roller. Specifically, it can be achieved by a segmented temperature gradient and roller speed difference, so that the polyvinyl alcohol film forms a highly oriented structure at a specific stretching ratio, thereby improving the uniformity of the polarization performance. Among them, the iodine staining treatment refers to immersing the stretched film material in a solution containing iodine compounds. Specifically, an iodine-potassium iodide aqueous solution can be used for adsorption staining, so that iodine molecules are oriented along the polyvinyl alcohol molecular chain to form a polarization selective absorption layer. Among them, the cross-linking with the boron-containing solution refers to chemically treating the stained film material with boric acid or borax solution. Specifically, it can be soaked in boric acid aqueous solution and then cured at high temperature, so that boron ions form a cross-linking network with polyvinyl alcohol molecules, thereby enhancing the moisture and heat resistance and dimensional stability of the film material.

[0024] The humidity adjustment treatment enables the polyvinyl alcohol film to reach a uniform water content state before stretching, avoiding cracks or thickness fluctuations during stretching due to uneven water distribution. The stretching ratio controls the temperature and roller speed in segments to achieve a stepped orientation of the molecular chains, reducing the concentration of residual stress. The iodine staining treatment uses the oriented polyvinyl alcohol molecular chains to adsorb iodine ions to form an anisotropic light-absorbing layer, thereby generating a polarization function. The cross-linking with the boron-containing solution constructs a three-dimensional cross-linking structure through the coordination of boron ions and polyvinyl alcohol hydroxyl groups, inhibiting the swelling or hydrolysis of the film material in high temperature and high humidity environments.

[0025] The present application further proposes to use an ultraviolet curable adhesive for bonding during the lamination process. The adhesive cures under light conditions and forms a bonding layer with high adhesion and transparency between the two films.

[0026] Ultraviolet-curable adhesives refer to adhesive materials that initiate cross-linking reactions of photosensitive substances through ultraviolet irradiation. Specifically, acrylate or epoxy resin prepolymers can be used as the main agent, and photoinitiators are added to achieve this. Its function is to achieve rapid curing through photochemical reactions and avoid interface defects caused by solvent volatilization. Curing under light conditions means using an ultraviolet light source to excite the photoinitiator in the adhesive to initiate a polymerization reaction, which can be specifically achieved by irradiating with a UV lamp in the wavelength range of 200 - 400 nanometers. Its function is to shorten the curing time and improve the uniformity of the bonding layer. High adhesion refers to the strong bonding state formed between the adhesive and the interface of the film material, which can be specifically achieved by adjusting the rheological properties and surface wettability of the adhesive. Its function is to prevent interlayer peeling and maintain the stability of the composite structure. Transparency refers to the transmission ability of the bonding layer to visible light, which can be specifically achieved by using inorganic nanoparticles or low molecular weight monomers with refractive index matching as additives. Its function is to reduce light scattering loss and maintain the optical properties of the polarizer.

[0027] Specifically, when the polarizing functional layer is bonded to the protective film, the ultraviolet-curable adhesive is evenly coated on the surface of one of the films, and then the other film is covered on it to form a sandwich structure. By irradiating the adhesive area with an ultraviolet light source, the photoinitiator absorbs ultraviolet light of a specific wavelength and decomposes to generate active free radicals or cations, triggering a chain polymerization reaction of the prepolymer in the adhesive, and finally forming a bonding layer with a cross-linked network structure. During this process, the adhesive fully fills the microstructures on the surface of the film material in the liquid phase, and after curing, a uniform bonding interface without bubbles and solvents is formed.

[0028] This application further proposes to perform an anti-scratch coating treatment on the surface of the polarizer after bonding.

[0029] Anti-scratch coating treatment means coating a layer of transparent material with wear-resistant properties on the surface of the polarizer, which can be specifically achieved by using polyurethane or acrylate resin materials through spraying or roll coating processes. After curing, this coating combines with the substrate to form a protective layer, which can resist external physical friction and chemical corrosion while maintaining optical transparency. Among them, after bonding means performing it after the three-layer structure of the anti-glare substrate film, polarizing functional layer, and protective film is completed. At this time, the composite film has completed the assembly of the main structure, and the surface treatment can avoid the internal optical layer being affected by subsequent processes.

[0030] Specifically, the anti-scratch coating treatment is carried out after the composite film is prepared. The coating material is evenly applied to the outer surface of the polarizer through a spraying device or a roll coating device, and then a UV light or heat curing process is used to harden the coating. For example, the coating thickness can be controlled at the micron level, and the curing conditions are adjusted according to the type of coating material. This process step is compatible with the existing surface treatment process and does not require additional complex equipment.

[0031] It should be noted that the 105-inch extra-large-sized polarizers are mostly for commercial use and are exposed to the open-air environment for a long time. For traditional TAC-based hydrophilic materials, due to their use in harsh environments such as high temperature and humidity, they are prone to dimensional deformation and warping problems due to moisture absorption, and may even cause PVA hydrolysis and a decrease in polarization degree, resulting in phenomena such as adhesive delamination and glue cracking, affecting the quality of the polarizer. Therefore, for the production of 105-inch extra-large-sized polarizers, in terms of raw material selection, hydrophobic materials are preferably used, which can not only meet the assembly requirements of 105-inch extra-large-sized liquid crystal displays, but also have excellent weather resistance and water resistance. In the traditional process using hydrophilic materials, since the surface of hydrophilic materials contains a large number of hydroxyl groups, an alkali washing process is generally used to pre-lower the contact angle of the film material to enhance the adhesive force of the water-based glue; while the surface of hydrophobic materials has fewer or even no hydroxyl groups, and the contact angle cannot be reduced by using a general alkali washing process, as Figure 4 shown, so one of corona or plasma is used to replace the traditional alkali washing process to reduce the contact angle of the film material. The role of reducing the contact angle of the film material here is to enhance the surface activity of the film material, increase the surface contact area of the UV glue, and at the same time form an "anchoring" effect to increase the adhesiveness of the UV glue. It can not only simplify the production process, but also avoid the generation of alkali washing sewage. Example 2:

[0032] The present application further provides a high haze polarizer for VA, which includes a three-layer structure of an anti-glare functional film, a polarizing layer, and a protective film laminated in sequence. The anti-glare functional film has a light scattering structure for increasing haze and suppressing specular reflection. The polarizing layer is a polyvinyl alcohol film that has been stretched, dyed, and crosslinked. The protective film is adhered to the polarizing layer through an adhesive layer for providing mechanical support and environmental protection.

[0033] The light scattering structure of the anti-glare functional film refers to a randomly distributed micro-structure formed by embossing or coating. Specifically, an embossing process can be used to form micron-level concave and convex textures on the film surface or a coating containing dispersed particles can be coated to achieve this. This structure reduces specular reflection by scattering incident light and controls the scattering angle to balance haze and light transmittance. Among them, the stretching, dyeing, and crosslinking treatment of the polarizing layer means that the polyvinyl alcohol film is subjected to multi-stage directional stretching to form a uniform molecular orientation, dyed with an iodine solution to endow polarization characteristics, and crosslinked with a boric acid solution to enhance the heat and humidity resistance. This treatment can ensure the stability of polarization performance and adapt to the complex outdoor environment. Among them, the adhesion of the adhesive layer and the protective film means that a UV-curable adhesive is used to adhere the protective film to the surface of the polarizing layer, and specifically, it can be formed by quickly curing after coating a photosensitive resin and irradiating it with ultraviolet light. This method avoids bubbles or defects caused by solvent volatilization and at the same time achieves high transparency and bonding strength.

[0034] The anti-glare functional film scatters light through its surface microstructure, suppressing the specular reflection problem under strong outdoor light. At the same time, by controlling the size and distribution of the microstructure, the haze is maintained above 20%. The polarizing layer undergoes multi-stage stretching and cross-linking treatments to ensure the consistency of the polarization axis and the dimensional stability in a humid and hot environment. The adhesive layer adopts an ultraviolet curing process. During the lamination process, the adhesive layer is rapidly cured by adjusting the light intensity and time, avoiding the deformation of the film material caused by long-term high temperature in the traditional thermal curing process. The protective film selects a hydrophobic material and enhances the bonding force with the adhesive through surface corona treatment, ultimately forming a composite structure with anti-glare, weather resistance, and mechanical protection functions.

[0035] The present application further proposes that the surface of the anti-glare functional film has micro-convex structures. The micro-convex structures refer to the microscopic convex morphologies formed on the surface of the anti-glare functional film, which can be specifically realized by a molding process or a process of coating dispersed particles. By controlling the distribution density and height of the microstructures, light scattering units are formed. This structure can scatter the incident light, reducing the specular reflection intensity, and at the same time avoiding the decrease in light transmittance caused by over-dense or over-high structures.

[0036] The random distribution pattern of the micro-convex structures means that each micro-convex unit presents a disordered arrangement characteristic on the film surface, which can be specifically realized by adjusting the texture design of the molding die or the coating process parameters, avoiding the interference fringe phenomenon caused by periodic arrangement. This distribution method can evenly diffuse the scattered light in space, suppressing the formation of glare spots.

[0037] Specifically, through the random distribution of the micro-convex structures on the surface of the anti-glare functional film, a multiple scattering effect occurs when the incident light contacts the film surface. When the light passes through the micro-convex units, refraction, reflection, and diffuse reflection occur, disrupting the original specular reflection path and dispersing the reflected light energy in different directions. While enhancing the haze, this structure reduces the occurrence probability of total reflection phenomena in the light path by controlling the matching relationship between the height of the micro-convex units and the refractive index of the substrate, thereby maintaining the overall light transmittance performance of the polarizer.

[0038] The present application further proposes that an optically matched adhesive layer is provided between the polarizing layer and the anti-glare functional film, and this adhesive layer has the characteristics of low birefringence and high light transmittance.

[0039] The optically matched adhesive layer refers to a bonding material layer with a refractive index close to that of the polarizing layer and the anti-glare functional film. Specifically, it can be achieved by using a UV-curable resin added with nano-silica or fluorinated polymer, and the refractive index matching is realized by adjusting the proportion of resin components. The low birefringence characteristic means that the internal molecules of the adhesive layer are arranged uniformly after curing, and no additional phase difference is generated when polarized light passes through. Specifically, the molecular orientation can be suppressed by optimizing the type of photoinitiator and the curing conditions. The high light transmittance characteristic means that the adhesive layer has low absorption and scattering losses in the visible light band. Specifically, high-purity raw materials and filtration processes can be used to reduce impurity particles, so that the light transmittance is maintained above 90%.

[0040] When the adhesive layer adheres to the polarizing layer and the anti-glare functional film, its refractive index matches the optical parameters of the two functional layers on both sides, thereby reducing reflection and scattering at the interface. During the UV curing process, a uniform cross-linked structure is formed inside the adhesive, avoiding the birefringence phenomenon caused by differences in molecular orientation. The cured adhesive layer maintains the stability of the light path in the polarized light transmission path, and at the same time reduces the brightness loss through the high light transmittance characteristic, ensuring the display contrast and anti-glare effect of the final polarizer in a strong light environment.

[0041] The above are only the preferred embodiments of the present invention, but not the limitations on the embodiments of the present invention. Those of ordinary skill in the art should understand that any modifications, equivalent replacements, and improvements made based on the present invention without departing from the creative concept of the present invention all fall within the scope of the claims of the present invention.

Claims

1. A method for preparing a high haze polarizer for VA by UV curing, characterized in that, It includes the following steps: Use an anti-glare substrate film with a haze-enhancing function as the upper support film; Prepare a polarizing functional layer, which is formed by subjecting a polyvinyl alcohol film to orientation stretching, dyeing, and crosslinking treatments; Bond the anti-glare substrate film to the polarizing functional layer, and bond a protective film on the other side to form a three-layer structure; During the bonding process, use an ultraviolet curable adhesive and carry out light curing; Perform surface treatment and size cutting on the obtained composite film to obtain a polarizing plate that meets the requirements of the in-plane switching (IPS) mode in terms of size.

2. The UV curing preparation method of the high haze polarizer for VA according to claim 1, wherein The anti-glare substrate film forms a haze layer by means of embossing microstructures or coating dispersed particles. The haze layer has randomly distributed microstructures. The particle size of the atomizing structure of the high-haze film is between 0.5 μm and 5 μm, and the haze is in the range of 20% to 30%.

3. The UV curing preparation method of the high haze polarizer for VA according to claim 1, characterized in that, The polyvinyl alcohol film is subjected to humidity adjustment treatment before stretching, the stretching ratio is controlled during the stretching process, iodine dyeing treatment is carried out after stretching, and then crosslinking is carried out through a boron-containing solution to enhance its hydrothermal stability.

4. The UV curing preparation method of the high haze polarizing plate for VA according to claim 1, characterized in that, The bonding process uses an ultraviolet curable adhesive for bonding. The adhesive cures under light irradiation conditions and forms a bonding layer with high adhesion and transparency between the two films.

5. The UV curing preparation method of the high haze polarizing plate for VA according to claim 1, characterized in that, The surface treatment of the obtained composite film includes performing an anti-scratch coating treatment on the surface of the polarizing plate after bonding.

6. A high haze polarizer for VA, which is prepared by the UV curing preparation method of the high haze polarizer for VA according to any one of claims 1-5, and is characterized in that, It includes a three-layer structure of an anti-glare functional film, a polarizing layer, and a protective film stacked in sequence, where: The anti-glare functional film has a light scattering structure for increasing the haze and suppressing specular reflection; The polarizing layer is a polyvinyl alcohol film that has been subjected to stretching, dyeing, and crosslinking treatments; The protective film is bonded to the polarizing layer through an adhesive layer for providing mechanical support and environmental protection.

7. The high haze polarizing sheet for VA according to claim 6, characterized in that, The surface of the anti-glare functional film has a micro-convex structure.

8. The high haze polarizer for VA according to claim 6, wherein, An optically matched adhesive layer with low birefringence and high light transmittance characteristics is provided between the polarizing layer and the anti-glare functional film.

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