Methods to improve the anti-glare function of privacy films, privacy films

Abstract

This invention relates to the field of anti-glare and privacy film technology, and particularly to a method for improving the anti-glare function of privacy films and the privacy film itself. The method for improving the anti-glare function of privacy films involves preparing a privacy film comprising a base film layer one, on which a privacy layer one, an adhesive layer, a base film layer two, a privacy layer two, and an anti-glare layer are sequentially arranged. Both base film layer one and base film layer two include a base film. Both privacy layer one and privacy layer two include multiple trapezoidal privacy structures, with light-transmitting material filling the spaces between the privacy structures. The anti-glare layer includes anti-glare structures; these anti-glare structures include concentric circle structures and quadrangular pyramid structures. The anti-glare structures are obtained by curing an anti-glare coating, which is prepared by mixing raw materials including tetraethyl orthosilicate, ethanol, hydrochloric acid, polyethylene glycol, and microspheres. The microspheres include barium titanate microspheres and modified barium titanate microspheres. The modified barium titanate microspheres are prepared from citric acid, PVP, and barium titanate microspheres. The membrane of this invention has both privacy and anti-glare effects.

Description

Technical Field

[0001] This invention relates to the field of anti-glare and privacy film technology, and particularly to a method for improving the anti-glare function of privacy films and a privacy film. Background Technology

[0002] With increasing demand for privacy protection, privacy screen protectors are becoming more widely used in electronic devices. By limiting the viewing angle of the screen, privacy screen protectors effectively protect user privacy. However, traditional privacy screen protectors have revealed a series of problems during use, including screen glare, which affects the user experience.

[0003] Especially in bright or strong light environments, the screen surface is prone to glare due to the reflection of ambient light, making the screen content difficult to see and causing discomfort to users.

[0004] Currently, most anti-glare and privacy screen protectors on the market are independently designed. Privacy screen protectors focus on privacy protection, while anti-glare screen protectors focus on reducing reflected light. These two functions are difficult to balance in terms of materials and structure, and most existing products require users to choose between privacy and anti-glare functions, failing to simultaneously meet the needs of privacy protection and comfortable viewing. Summary of the Invention

[0005] The purpose of this invention is to provide a method and a privacy film that improves the anti-glare function of privacy films, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] (a) Methods to improve the anti-glare function of privacy films include the following steps:

[0008] Preparation of a micro-concave roller with a privacy protection structure: Take a metal roller blank and perform laser engraving to engrave a micro-concave roller with a privacy protection structure. Then, perform chrome plating on the surface of the micro-concave roller to obtain a micro-concave roller with a privacy protection structure.

[0009] Preparation of a micro-concave roller with an anti-glare structure: Take a metal roller blank and perform laser engraving to engrave a micro-concave roller with an anti-glare structure. Then, perform chrome plating on the surface of the micro-concave roller to obtain a micro-concave roller with an anti-glare structure.

[0010] Using a base film as the base film layer one, a micro-grooved roller with a privacy structure applies the main coating to the upper surface of the base film layer one by hard pressure transfer, and then cures it. A light-transmitting material is filled between the privacy structures, and then cured. The privacy structure and the light-transmitting material together constitute the privacy layer one.

[0011] Use another base film as the second base film layer, apply adhesive under the second base film layer to bond the second base film layer and the first privacy layer, and form an adhesive layer between the second base film layer and the first privacy layer.

[0012] A micro-concave roller with a privacy-protecting structure applies the main coating onto the upper surface of the second base film layer by hard pressure transfer, and then cures it. A light-transmitting material is filled between the privacy-protecting structures and then cured. The privacy-protecting structure and the light-transmitting material together constitute the second privacy-protecting layer.

[0013] The anti-glare coating is applied to the upper surface of the privacy layer 2 using a micro-concave roller with an anti-glare structure through a hard pressure transfer method, and then cured to obtain the anti-glare layer.

[0014] The overall structure prepared by the above steps is a privacy film.

[0015] Preferably, the preparation method of the anti-glare coating includes the following steps: mixing tetraethyl orthosilicate with ethanol, adding hydrochloric acid, stirring, adding polyethylene glycol, stirring evenly, then adding microspheres, stirring evenly, to obtain the anti-glare coating.

[0016] Preferably, the preparation method of modified barium titanate microspheres includes the following steps: dissolving citric acid, adding PVP, stirring to obtain a citric acid solution; adding barium titanate microspheres to water, ultrasonically dispersing, adding sodium hydroxide, stirring, centrifuging, washing, and drying to obtain activated barium titanate microspheres; dispersing the activated barium titanate microspheres in water, ultrasonically treating, slowly adding citric acid solution, stirring, heating, and continuing stirring for modification; after modification, centrifuging, washing, and drying to obtain modified barium titanate microspheres.

[0017] Preferably, the main coating includes a light-absorbing material and a light-blocking agent; the light-absorbing material or light-blocking agent includes acrylic resin, polyurethane resin, and polyester resin.

[0018] Preferably, the light-transmitting material includes light-transmitting ink, light-transmitting acrylic, graphite, PMMA, and PBMA.

[0019] Preferably, the barium titanate microspheres have a particle size of 50-80 nm.

[0020] (ii) The privacy film is prepared by the aforementioned method.

[0021] The privacy film includes a base film layer 1, a privacy layer 1 on the upper surface of the base film layer 1, an adhesive layer on the upper surface of the privacy layer 1, a base film layer 2 on the upper surface of the adhesive layer, a privacy layer 2 on the upper surface of the base film layer 2, and an anti-glare layer on the upper surface of the privacy layer 2.

[0022] Both base film layer one and base film layer two include a base film. Both privacy layer one and privacy layer two include multiple trapezoidal privacy structures. Light-transmitting material is filled between the privacy structures. The anti-glare layer includes an anti-glare structure. The anti-glare structure includes a concentric circle structure and a four-corner pyramid structure.

[0023] The anti-glare structure is obtained by curing an anti-glare coating, which is made by mixing raw materials including tetraethyl orthosilicate, ethanol, hydrochloric acid, polyethylene glycol, and microspheres. The microspheres include barium titanate microspheres and modified barium titanate microspheres. The modified barium titanate microspheres are prepared by citric acid, PVP, and barium titanate microspheres.

[0024] Preferably, for the concentric circle structure, the concentric circles are formed by multiple circles nested one inside another, sharing a common center. The outermost circle of the concentric circles is a regular hexagon circumscribed by the outermost circle, and the diameter of the outermost circle of the concentric circles is 1~3mm.

[0025] Preferably, for the concentric circle structure, the position of the circle is a convex shape, forming a peak, and there are depressions between the circles, forming valleys. The depth of the depressions is 20-25 μm, the distance between two adjacent peaks is 80-90 μm, and the distance between two adjacent valleys is 80-90 μm.

[0026] Preferably, the second base film layer and the first base film layer are aligned in the same direction, while the first privacy layer and the second privacy layer are aligned in different directions; the thickness of the adhesive layer is 10-20μm; the material of the base film includes PET and PC.

[0027] The technical effects and advantages of this invention are as follows:

[0028] 1. By utilizing the multi-layered structure and thickness of the privacy screen protector, the interference between reflected and transmitted light is controlled. When incident light is reflected from the surface of the privacy screen protector, the anti-glare structure causes a phase difference in the reflected light, resulting in destructive interference between the reflected light beams, thus greatly reducing the intensity of the reflected light. Simultaneously, the transmitted light is enhanced due to constructive interference, increasing the light transmittance. Reduced screen reflectivity improves screen visibility, allowing for clear viewing even in bright outdoor environments. It also reduces the stimulation of the eyes from strong light reflection, alleviating visual fatigue and protecting the eyes.

[0029] 2. The privacy viewing angle of the privacy film of the present invention is within 26°, the glare value UGR < 12, and the brightness is also improved, so that the display screen seen by the user is clear and has a better privacy effect; at the same time, it has the advantage of anti-glare, the preparation method is simple, easy to implement and control, and convenient to realize industrialization.

[0030] 3. This invention further prepares an anti-glare coating, in which microspheres form a microscopic scattering structure within the coating, reducing surface reflection by regulating scattering while maintaining good light transmittance. This invention also further modifies the microspheres, thereby further improving the performance of the privacy film.

[0031] The other more specific mechanisms are described in detail in the embodiments. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0033] In the attached diagram:

[0034] Figure 1 This is a schematic diagram of the overall structure of the privacy film of the present invention; it should be noted that the anti-glare structure is schematic for ease of understanding.

[0035] Figure 2 This is a top-view structural diagram of the anti-glare structure of the present invention; it should be noted that the valley is omitted.

[0036] Figure 3 This is a three-dimensional structural diagram of the anti-glare structure of the present invention when viewed from the side.

[0037] The markings in the diagram are: 1. Regular hexagon, 2. Privacy protection structure, 3. Base film layer one, 4. Light-transmitting material; 5. Privacy protection layer one, 6. Base film layer two, 7. Adhesive layer, 8. Privacy protection layer two, 9. Anti-glare structure; 10. Anti-glare layer; 11. Peak; 12. Valley. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise specified, the experimental methods used below are conventional methods, and the materials, reagents, components, etc. used are commercially available unless otherwise specified.

[0039] This invention provides, for example Figure 1-3 The privacy film shown includes the following embodiments:

[0040] Example 1

[0041] The specific steps to improve the anti-glare function of privacy films are as follows:

[0042] S1. Preparation of base film: Prepare the base film. The material of the base film is PET (polyethylene terephthalate) or PC (polycarbonate).

[0043] S2. Preparation of a micro-concave roller with privacy screen structure 2: A metal roller blank is laser-engraved to create a micro-concave roller with privacy screen structure 2. The surface of the micro-concave roller is then chrome-plated with a 0.1 μm chromium layer. The metal material can be stainless steel. (Refer to...) Figure 1The privacy screen structure 2 is trapezoidal, with the acute angle formed by the waist of the trapezoid and the upper surface of the base film being 85°-89°, and the included angle between privacy screen structures 2 being 1-5°. In this way, the privacy screen structure 2 allows the resulting privacy film to have a privacy effect within 26°.

[0044] S3. Preparation of a micro-concave roller with anti-glare structure 9: A metal roller blank is laser-engraved to create a micro-concave roller with anti-glare structure 9. The surface of the micro-concave roller is then chrome-plated with a 0.1 μm chromium layer. The metal material can be stainless steel. When viewed from above, the anti-glare structure 9 can be a concentric circle structure, formed by multiple circles nested one inside the other, sharing a common center. The outermost circle of the concentric circles can circumscribed in a regular hexagon 1 (refer to...). Figure 2 The diameter of the outermost circle of the concentric circles is 1-3 mm. (Refer to...) Figure 3 When viewed from the side, the concentric circles appear as convex features, forming "peak 11". There are depressions between the circles, forming "valleys 12". The depth of these depressions is 20-25 μm. The distance between two adjacent peaks 11 is 80-90 μm, and the distance between two adjacent valleys 12 is also 80-90 μm. The anti-glare structure 9 can also be a quadrangular pyramid structure.

[0045] S4. Using a base film as base film layer 3, a micro-grooved roller with anti-spy structure 2 applies the main coating material to the upper surface of base film layer 3 by hard pressure transfer, and cures it under ultraviolet light. The main coating material used in anti-spy structure 2 is a light-absorbing material or light-blocking agent, which can be acrylic resin, polyurethane resin, or polyester resin.

[0046] Then, a light-transmitting material 4 is filled between the privacy structures 2 and cured under ultraviolet light. The privacy structures 2 and the light-transmitting material 4 together constitute the privacy layer 5. The light-transmitting material 4 can be a light-transmitting ink or a light-transmitting acrylic, and graphite particles, PMMA, or PBMA can also be doped into the light-transmitting material 4. This not only improves the light transmittance and brightness, but also improves the uniformity of light transmission.

[0047] S5. Using another base film as base film layer two 6, apply adhesive under base film layer two 6 to bond base film layer two 6 and privacy layer one 5 together, thereby forming adhesive layer 7 between base film layer two 6 and privacy layer one 5. The thickness of adhesive layer 7 is 10-20μm. Base film layer two 6 and base film layer one 3 are aligned in the same direction.

[0048] Using the same method as privacy layer 5, privacy layer 28 is prepared on base film layer 26. However, privacy layer 5 and privacy layer 28 have different orientations. Specifically, privacy structure 2 in privacy layer 5 can be obtained by rotating it by 90°.

[0049] S6. Apply the anti-glare coating to the upper surface of the privacy layer 8 using a micro-concave roller with an anti-glare structure 9 by hard pressure transfer, and cure it under ultraviolet light or high temperature to obtain the anti-glare layer 10.

[0050] The privacy film is prepared through the above steps, as shown in the reference. Figure 1 .

[0051] It should be noted that, referring to Figure 2 and Figure 3 The anti-glare structure 9 exhibits multiple annular peaks 11 and valleys 12. This wavy design effectively scatters light in different directions. When light passes through these irregular surfaces, it is dispersed or reflected, reducing direct reflected light entering the eye and thus reducing the impact of glare. Moreover, the anti-glare structure 9 can form small-angle reflections or multiple reflections, greatly reducing the intensity of light. The privacy layer (privacy layer 1 5 and privacy layer 2 8) is designed to restrict light transmission at certain angles through special microstructures (light passes through the light-transmitting material 4, and the privacy structure 2 restricts light transmission to prevent privacy). After the anti-glare structure 9 is pressed onto the base film layer 2 6, the incident and transmission angles of light are further controlled. This superposition effect enhances the anti-glare performance while maintaining the privacy function.

[0052] Example 2

[0053] In this embodiment, a specific preparation method for the anti-glare coating is given. By improving the anti-glare coating, the anti-glare effect is further enhanced. The specific steps are as follows:

[0054] Preparation of modified barium titanate microspheres:

[0055] 1. Raw materials:

[0056] Polyvinylpyrrolidone (PVP): 99% purity;

[0057] Sodium hydroxide: 99% purity;

[0058] Citric acid: 99% purity;

[0059] Barium titanate microspheres: particle size 50-80nm, purity 99%, available from Xi'an Qiyue Biotechnology Co., Ltd.

[0060] 2. Activation of barium titanate microspheres: Add 10g of barium titanate microspheres to 50ml of deionized water, sonicate for 15 minutes, add 0.1g of sodium hydroxide, stir at 60℃ for 1 hour, centrifuge, wash 3 times, and dry at 80℃ for 2 hours to obtain activated barium titanate microspheres.

[0061] 3. Preparation of citric acid solution: Dissolve 0.25g of citric acid in 30ml of deionized water, adjust the pH to 4.5-5.0, add 0.2g of PVP, stir at room temperature for 30 minutes to completely dissolve, and obtain citric acid solution.

[0062] 4. Modification: 1) First stage modification: Disperse the activated barium titanate microspheres in 20 ml of deionized water, sonicate for 20 minutes, slowly add citric acid solution, stir at 45℃ for 2 hours, and maintain pH at 4.5-5.0; 2) Second stage modification: Heat to 60℃ and continue stirring at 400 rpm for 3 hours; 3) Post-treatment: After modification, centrifuge at 8000 rpm for 15 minutes, wash with deionized water or anhydrous ethanol, vacuum dry, and store at room temperature to obtain modified barium titanate microspheres.

[0063] It should be further explained that the modified barium titanate microspheres have a three-layer "core-shell-brush" structure. The inner layer consists of a core formed by coordination bonds between citric acid and barium titanate; the middle layer consists of a shell formed by hydrogen bonds between PVP and citric acid; and the outer layer consists of a molecular brush formed by the outward extension of PVP's hydrophilic groups. Synergistic effects: Citric acid provides multi-site coordination, PVP provides steric hindrance, citric acid forms a dense inner layer of protection, and PVP forms an extended outer layer of shielding, resulting in multi-layered steric protection and a synergistic effect: improved dispersion stability and enhanced interfacial compatibility.

[0064] Preparation of anti-glare coating:

[0065] 1. Raw materials:

[0066] Tetraethyl orthosilicate: TEOS, purity 99%;

[0067] Ethanol: 99% purity;

[0068] Polyethylene glycol (PEG), molecular weight 10000, purity 99%;

[0069] Hydrochloric acid: 99% purity.

[0070] 2. Preparation: Mix 40g of tetraethyl orthosilicate with 160g of ethanol, add 20ml of 1M hydrochloric acid, stir for 2 hours, add 11g of polyethylene glycol, stir evenly, then add 10g of the modified barium titanate microspheres prepared above, stir evenly to obtain the anti-glare coating.

[0071] It should be noted that the anti-glare coating is cured at high temperature.

[0072] To further explain, tetraethyl orthosilicate serves as the matrix, providing film-forming properties, while barium titanate microspheres form a microscopic scattering structure within the coating, reducing surface reflection by regulating scattering while maintaining good light transmittance.

[0073] Film-forming mechanism of coatings: Sol stage: all components are uniformly dispersed; Gel stage: a network structure is formed; Drying stage: solvent evaporates, forming a dense film.

[0074] Synergistic effects of the components: Tetraethyl orthosilicate and modified barium titanate microspheres form an organic-inorganic hybrid structure; specifically, the barium titanate microspheres provide scattering functionality, while the silicon-oxygen network provides a transparent matrix, achieving high light transmittance and low reflectance together. Additionally, polyethylene glycol provides plasticizing and improves interfacial bonding, while ethanol and hydrochloric acid regulate viscosity and catalysis, ultimately forming a multi-layered network structure and enhancing overall performance.

[0075] Example 3

[0076] Unlike Example 2, the barium titanate microspheres are not modified, as detailed below:

[0077] Preparation of anti-glare coating:

[0078] 1. Raw materials:

[0079] Tetraethyl orthosilicate: TEOS, purity 99%;

[0080] Ethanol: 99% purity;

[0081] Polyethylene glycol (PEG), molecular weight 10000, purity 99%;

[0082] Hydrochloric acid: 99% purity;

[0083] Barium titanate microspheres: particle size 50-80nm, purity 99%, available from Xi'an Qiyue Biotechnology Co., Ltd.

[0084] 2. Preparation: Mix 40g of tetraethyl orthosilicate with 160g of ethanol, add 20ml of 1M hydrochloric acid, stir for 2 hours, add 11g of polyethylene glycol, stir evenly, then add 10g of barium titanate microspheres, stir evenly to obtain the anti-glare coating.

[0085] It should be noted that the anti-glare coating is cured at high temperature.

[0086] Example 4

[0087] Using the method of Example 1 and the anti-glare coating prepared in Example 2, a privacy film was prepared. The anti-glare structure 9 is a concentric circle structure.

[0088] Example 5

[0089] Using the method of Example 1 and the anti-glare coating prepared in Example 3, a privacy film was prepared. The anti-glare structure 9 is a concentric circle structure.

[0090] Testing: The privacy films of Examples 4 and 5 were tested according to CIE 117-1995, and the glare value was evaluated using the UGR formula specified therein.

[0091] in:

[0092] 1. Light source: D65 standard light source.

[0093] 2. Observation parameters: Observation distance: 2m; Observation height: 1.2m; Observation angle range: 0°-45°; Field of view: 1°.

[0094] 3. Environmental parameters: Room temperature: 23±2℃; Relative humidity: 45±5%; Background brightness: ≤10cd / m²; Ambient illuminance: <1 Lux.

[0095] 4. Measurement point arrangement: 1) Background brightness measurement: center point, 4 points on the top, bottom, left and right, and 4 points at the four corners. 2) Sample brightness measurement: 3×3 grid points; edge distance: 1 / 6 of the sample size; repeat 3 times for each point.

[0096] 5. Angle settings: 1) Horizontal direction: 0°, ±15°, ±30°, ±45°. 2) Vertical direction: 0°, 15°, 30°, 45°.

[0097] Experimental results:

[0098] Table 1 UGR values ​​of Example 4

[0099]

[0100] Table 2 UGR values ​​of Example 5

[0101]

[0102] As can be seen from the above, the glare values ​​UGR of both Example 4 and Example 5 are less than 12. Example 4 has a lower glare value than Example 5 and performs better in terms of anti-glare effect.

[0103] In Example 4, compared with the unmodified barium titanate microspheres in Example 5, the modified barium titanate microspheres were more uniformly dispersed in the coating matrix, reducing particle aggregation and improving the stability of the coating.

[0104] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A privacy film, characterized by, The application discloses a privacy protection film, which comprises a base film layer one, a privacy protection layer one on the upper surface of the base film layer one, a glue layer on the upper surface of the privacy protection layer one, a base film layer two on the upper surface of the glue layer, a privacy protection layer two on the upper surface of the base film layer two and an anti-glare layer on the upper surface of the privacy protection layer two; the base film layer one and the base film layer two both comprise a base film, and the base film is made of PET (polyethylene terephthalate) or PC (polycarbonate); the privacy protection layer one and the privacy protection layer two both comprise a plurality of trapezoidal privacy protection structures, the privacy protection structures are filled with a light-transmitting material, the trapezoidal waist forms an acute angle of 85-89 degrees with the upper surface of the base film, the included angle between the privacy protection structures is 1-5 degrees, and the privacy protection structure of the privacy protection layer one is rotated by 90 degrees to obtain the privacy protection structure of the privacy protection layer two; the anti-glare layer comprises anti-glare structures, and the anti-glare structures are concentric circle structures or quadrangular pyramid structures; the anti-glare structures are obtained by curing anti-glare paint, the anti-glare paint is prepared by mixing tetraethyl orthosilicate, ethanol, hydrochloric acid, polyethylene glycol and microspheres, the microspheres are modified barium titanate microspheres, the modified barium titanate microspheres have a core-shell-brush three-layer structure, the inner layer is a core formed by a coordination bond between citric acid and barium titanate, the middle layer is a shell formed by hydrogen bond action between PVP (polyvinylpyrrolidone) and citric acid, and the outer layer is a molecular brush with a brush structure formed by extending the hydrophilic groups of PVP outward.

2. The privacy film of claim 1, wherein, For the concentric circle structure, the concentric circles are formed by a plurality of circular layers, share one center, and the outermost circle of the concentric circles is circumscribed by a regular hexagon, and the diameter of the outermost circle of the concentric circles is 1-3 mm, and the side length of the regular hexagon is equal to the radius of the outermost circle of the concentric circles.

3. The privacy film of claim 1, wherein, For the concentric circle structure, the position of the circle of the concentric circles is a convex, forms a peak, and there is a concave between the circles, forms a valley, the depth of the concave is 20-25 microns, the distance between the adjacent two peaks is 80-90 microns, and the distance between the adjacent two valleys is 80-90 microns; the peak-valley structure makes the reflected light of the anti-glare layer undergo destructive interference to reduce the intensity of the reflected light, and makes the transmitted light undergo constructive interference to improve the light transmittance.

4. The privacy film of claim 1, wherein, The base film layer two and the base film layer one are in the same direction, and the privacy protection layer one and the privacy protection layer two are in different directions; the thickness of the glue layer is 10-20 microns.

5. A method for improving the anti-glare function of a privacy film, characterized by, The method comprises the following steps: preparing a micro-concave roller with a privacy structure: taking a metal roller blank and performing laser engraving to form a micro-concave roller with a trapezoidal privacy structure, and performing chrome plating treatment on the surface of the micro-concave roller to form a chromium layer with a thickness of 0.1 μm, thereby obtaining a micro-concave roller with a privacy structure; preparing a micro-concave roller with an anti-glare structure: taking a metal roller blank and performing laser engraving to form a micro-concave roller with a concentric circle structure or a quadrangular pyramid structure, and performing chrome plating treatment on the surface of the micro-concave roller to form a chromium layer with a thickness of 0.1 μm, thereby obtaining a micro-concave roller with an anti-glare structure; using a base film as a base film layer one, using the micro-concave roller with the privacy structure to coat a main coating on the upper surface of the base film layer one by a hard pressure transfer method, and performing ultraviolet curing, filling a light-transmitting material between the privacy structures, and performing ultraviolet curing, so that the privacy structures and the light-transmitting material together form a privacy layer one; using another base film as a base film layer two, coating an adhesive under the base film layer two to adhere the base film layer two and the privacy layer one, and forming an adhesive layer between the base film layer two and the privacy layer one; using the micro-concave roller with the privacy structure to coat the main coating on the upper surface of the base film layer two by the hard pressure transfer method, and performing ultraviolet curing, filling the light-transmitting material between the privacy structures, and performing ultraviolet curing, so that the privacy structures and the light-transmitting material together form a privacy layer two, and the privacy structure of the privacy layer one is rotated by 90° to obtain the privacy structure of the privacy layer two; using the micro-concave roller with the anti-glare structure to coat an anti-glare coating on the upper surface of the privacy layer two by the hard pressure transfer method, and performing ultraviolet curing or high-temperature curing to obtain an anti-glare layer; the whole structure prepared by the above steps is the privacy film of any one of claims 1-4, the privacy viewing angle of the privacy film is within 26°, and the glare value UGR is less than 12.

6. The method of improving the anti-glare function of a privacy film according to claim 5, wherein, The preparation method of the anti-glare coating comprises the following steps: mixing tetraethyl orthosilicate and ethanol, adding hydrochloric acid, stirring, adding polyethylene glycol, stirring uniformly, then adding microspheres, stirring uniformly, and obtaining the anti-glare coating.

7. The method of improving the anti-glare function of a privacy film according to claim 5, wherein, The preparation method of the modified barium titanate microspheres comprises the following steps: dissolving citric acid, adding PVP, and stirring to obtain a citric acid solution; adding barium titanate microspheres into water, ultrasonic dispersion, adding sodium hydroxide, stirring, centrifugation, washing, and drying to obtain activated barium titanate microspheres; dispersing the activated barium titanate microspheres in water, ultrasonic treatment, slowly adding the citric acid solution, stirring, heating, and continuously stirring for modification; after the modification is completed, centrifugation, washing, and drying are performed to obtain the modified barium titanate microspheres.

8. The method of claim 5, wherein the method further comprises applying a coating of a material having a refractive index of 1.5 or greater to the surface of the privacy film. The main coating is a light-absorbing material or an opacifier; the light-absorbing material or the opacifier comprises an acrylic resin, a polyurethane resin, or a polyester resin.

9. The method of claim 5, wherein the method further comprises applying a coating of a material having a refractive index of 1.5 or greater to the surface of the privacy film. The light-transmitting material comprises light-transmitting ink or light-transmitting acrylic; graphite particles or PMMA or PBMA can be doped in the light-transmitting material to improve light-transmitting uniformity and brightness.

10. The method of claim 5, wherein the method further comprises applying a coating of a material having a refractive index of 1.5 or greater to the surface of the privacy film. The particle size of the barium titanate microspheres is 50-80 nm, and the purity of the barium titanate microspheres is greater than or equal to 99%.

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