Method for improving anti-dazzle function of peep-proof film and peep-proof film

Abstract

The invention relates to the technical field of anti-dazzle peep-proof films, in particular to a method for improving the anti-dazzle function of a peep-proof film and the peep-proof film. The peep-proof film is prepared through the method for improving the anti-dazzle function of the peep-proof film and comprises a first base film layer, and a first peep-proof layer, an adhesive layer, a second base film layer, a second peep-proof layer and an anti-dazzle layer are sequentially arranged on the first base film layer; each of the first base film layer and the second base film layer comprises a base film, each of the first peep-proof layer and the second peep-proof layer comprises a plurality of trapezoidal peep-proof structures, light-transmitting materials are filled between the peep-proof structures, and the anti-dazzle layer comprises an anti-dazzle structure; the anti-dazzle structure comprises a concentric circle structure and a quadrangular pyramid structure; the anti-dazzle structure is obtained by curing an anti-dazzle coating, the anti-dazzle coating is prepared by mixing raw materials, the raw materials comprise tetraethoxysilane, ethanol, hydrochloric acid, polyethylene glycol and microspheres, and the microspheres comprise barium titanate microspheres and modified barium titanate microspheres; the modified barium titanate microspheres are prepared from citric acid, PVP and barium titanate microspheres. The film provided by the invention has peep-proof and anti-dazzle effects at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of anti-glare and anti-peeping films, and in particular to a method for improving the anti-glare function of an anti-peeping film and an anti-peeping film. Background Art

[0002] As people's demand for privacy protection increases, the use of privacy films in electronic devices has gradually become popular. Privacy films can effectively protect users' privacy by limiting the viewing angle of the screen. However, traditional privacy films expose a series of problems during use, including screen glare, which affects user experience.

[0003] Especially in high-light 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 of the anti-glare films and anti-peep films on the market are designed independently. The anti-peep film focuses on privacy protection, while the anti-glare film focuses on reducing reflected light. These two functions are difficult to take into account in terms of materials and structure. Most existing products require users to choose between anti-peep and anti-glare functions, and cannot meet the needs of privacy protection and comfortable viewing at the same time. Summary of the invention

[0005] The object of the present invention is to provide a method for improving the anti-glare function of an anti-peep film and an anti-peep film, so as to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: (I) A method for improving the anti-glare function of a privacy film, comprising the following steps: Preparation of a micro-concave roller with an anti-peeping structure: taking a metal roller blank and performing laser engraving to engrave a micro-concave roller with an anti-peeping structure, and then performing chrome plating on the surface of the micro-concave roller to obtain a micro-concave roller with an anti-peeping structure; Preparation of a micro-concave roller with an anti-glare structure: taking a metal roller blank and performing laser engraving to engrave a micro-concave roller with an anti-glare structure, and then performing chrome plating on the surface of the micro-concave roller to obtain a micro-concave roller with an anti-glare structure; Using a base film as the first base film layer, a micro-concave roller with an anti-peeping structure applies the main coating on the upper surface of the first base film layer by a hard pressure transfer method, and solidifies it; filling a light-transmitting material between the anti-peeping structure and the anti-peeping structure, and solidifying it; the anti-peeping structure and the light-transmitting material together constitute the first anti-peeping layer; Using another base film as the second base film layer, applying adhesive under the second base film layer to adhere the second base film layer to the first privacy protection layer, so as to form an adhesive layer between the second base film layer and the first privacy protection layer; The micro-concave roller with the anti-peeping structure applies the main coating to the upper surface of the second base film layer by hard pressure transfer, solidifies, fills the light-transmitting material between the anti-peeping structure and the anti-peeping structure, solidifies, and the anti-peeping structure and the light-transmitting material together constitute the second anti-peeping layer; The anti-glare coating is applied on the upper surface of the second anti-peeping layer by a micro-concave roller with an anti-glare structure through a hard pressure transfer method, and then cured to obtain an anti-glare layer; The overall structure prepared by the above steps is an anti-peep film.

[0007] Preferably, the preparation method of the anti-glare coating comprises the following steps: mixing tetraethyl orthosilicate with ethanol, adding hydrochloric acid, stirring, adding polyethylene glycol, stirring evenly, and then adding microspheres, stirring evenly to obtain the anti-glare coating.

[0008] Preferably, the preparation method of modified barium titanate microspheres comprises the following steps: dissolving citric acid, adding PVP, stirring, and obtaining a citric acid solution; adding the barium titanate microspheres into 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 dripping the citric acid solution, stirring, heating, and continuing to stir for modification; after the modification is completed, centrifuging, washing, and drying to obtain modified barium titanate microspheres.

[0009] Preferably, the main coating includes a light-absorbing material and a light-shielding agent; the light-absorbing material or the light-shielding agent includes acrylic resin, polyurethane resin, and polyester resin.

[0010] Preferably, the light-transmitting material includes light-transmitting ink, light-transmitting acrylic, graphite, PMMA, and PBMA.

[0011] Preferably, the particle size of the barium titanate microspheres is 50-80 nm.

[0012] (ii) Preparing an anti-peep film by the aforementioned method.

[0013] The anti-peep film comprises a base film layer 1, an anti-peep layer 1 is provided on the upper surface of the base film layer 1, an adhesive layer is provided on the upper surface of the anti-peep layer 1, a base film layer 2 is provided on the upper surface of the adhesive layer, an anti-peep layer 2 is provided on the upper surface of the base film layer 2, and an anti-glare layer is provided on the upper surface of the anti-peep layer 2; The base film layer 1 and the base film layer 2 both include a base film, the anti-peeping layer 1 and the anti-peeping layer 2 both include a plurality of trapezoidal anti-peeping structures, light-transmitting materials are filled between the anti-peeping structures, the anti-glare layer includes an anti-glare structure; the anti-glare structure includes a concentric circle structure and a quadrangular pyramid structure; The anti-glare structure is obtained by curing the anti-glare coating, and the anti-glare coating is prepared by mixing raw materials. The raw materials include 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.

[0014] Preferably, for the concentric circle structure, the concentric circles are formed by a plurality of circles nested one layer at a time, sharing a common center, the outermost circle of the concentric circles circumscribes a regular hexagon, and the diameter of the outermost circle of the concentric circles is 1-3 mm.

[0015] Preferably, for the concentric circle structure, the positions of the concentric circles are convex to form peaks, there are depressions between the circles to form 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.

[0016] Preferably, the base film layer 2 and the base film layer 1 are in the same direction, and the anti-peep layer 1 and the anti-peep layer 2 are in different directions; the thickness of the adhesive layer is 10-20 μm; and the material of the base film includes PET and PC.

[0017] Technical effects and advantages of the present invention: 1. The multi-layer structure and thickness of the privacy film are used to control the interference of reflected light and transmitted light. When the incident light is reflected on the surface of the privacy film, due to the anti-glare structure, the reflected light will have a phase difference, resulting in destructive interference between the reflected light, thereby greatly reducing the intensity of the reflected light. At the same time, the transmitted light is enhanced due to constructive interference, which increases the light transmittance. The lower the screen reflectivity, the better the visibility of the screen. Even in strong light environments such as outdoor, the screen content can still be clearly seen. At the same time, it can reduce the stimulation of strong light reflection to the human eye, relieve visual fatigue, and play a role in eye protection.

[0018] 2. The anti-peeping viewing angle of the anti-peeping film of the present invention is within 26°, the glare value UGR is less than 12, and the brightness is also improved, so that the display screen seen by the user has high clarity and has a better anti-peeping effect; at the same time, it has the advantage of anti-glare, the preparation method is simple, easy to implement and control, and convenient for industrialization.

[0019] 3. The present invention further prepares an anti-glare coating, wherein the microspheres form a microscopic scattering structure in the coating, and the surface reflection is reduced by regulating the scattering while maintaining good light transmittance. The present invention further modifies the microspheres, and the performance of the privacy film is further improved by the modified microspheres.

[0020] The remaining more specific mechanisms are explained in detail in the examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0022] In the attached picture: Figure 1Schematic 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; Figure 2 1 is a schematic diagram of the structure of the anti-glare structure of the present invention when viewed from above; it should be noted that the valley is omitted; Figure 3 It is a schematic diagram of the three-dimensional structure of the anti-glare structure of the present invention when observed from the side.

[0023] Markings in the figure are: 1. regular hexagon, 2. anti-peeping structure, 3. base film layer one, 4. light-transmitting material; 5. anti-peeping layer one, 6. base film layer two, 7. adhesive layer, 8. anti-peeping layer two, 9. anti-glare structure; 10. anti-glare layer; 11. peak; 12. valley. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The experimental methods used below are conventional methods unless otherwise specified, and the materials, reagents, parts, etc. used, unless otherwise specified, can be obtained from commercial channels.

[0025] The present invention provides Figure 1-3 The privacy film shown includes the following embodiments: Example 1 The method to improve the anti-glare function of the privacy film is as follows: S1. Prepare a base film: prepare a base film, the material of the base film is PET (polyethylene terephthalate) or PC (polycarbonate).

[0026] S2, preparing a micro-concave roller with an anti-peeping structure 2: taking a metal roller blank and performing laser engraving to engrave a micro-concave roller with an anti-peeping structure 2, and then performing chrome plating on the surface of the micro-concave roller, with a chrome layer of 0.1 μm. The metal material can be stainless steel. Figure 1 The anti-peeping structure 2 is a trapezoid, the acute angle formed by the waist of the trapezoid and the upper surface of the base film is 85°-89°, and the angle between the anti-peeping structure 2 and the anti-peeping structure 2 is 1-5°. In this way, the anti-peeping structure 2 can make the obtained anti-peeping film have an anti-peeping effect within 26°.

[0027] S3. Prepare a micro-concave roller with an anti-glare structure 9: Take a metal roller blank and perform laser engraving to engrave a micro-concave roller with an anti-glare structure 9, and then perform chrome plating on the surface of the micro-concave roller, with a chrome layer of 0.1μm. The metal material can be stainless steel. When viewed from above, the anti-glare structure 9 can be a concentric circle structure, and the concentric circles can be formed by multiple circles one layer inside another, sharing a common center. The outermost circle of the concentric circle can circumscribe a regular hexagon 1 (refer to Figure 2 ), the diameter of the outermost circle of the concentric circle is 1~3mm. Figure 3 When viewed from the side, the position of the concentric circles is convex, forming a "peak 11", and there is a depression between the circles, forming a "valley 12", the depth of the depression is 20-25μm, the distance between two adjacent peaks 11 is 80-90μm, and the distance between two adjacent valleys 12 is 80-90μm. The anti-glare structure 9 can also be a quadrangular pyramid structure.

[0028] S4, using the base film as the base film layer 3, the micro-concave roller with the anti-peeping structure 2 applies the main coating on the upper surface of the base film layer 3 by hard pressure transfer, and cures under ultraviolet light. The main coating used in the anti-peeping structure 2 is a light absorbing material or a light shielding agent, which can be an acrylic resin, a polyurethane resin, or a polyester resin.

[0029] Then, a light-transmitting material 4 is filled between the anti-peeping structure 2 and the anti-peeping structure 2, and cured under ultraviolet light, and the anti-peeping structure 2 and the light-transmitting material 4 together form an anti-peeping layer 5. The light-transmitting material 4 can be a light-transmitting ink or a light-transmitting acrylic, and graphite particles or PMMA or PBMA can be doped in the light-transmitting material 4, which not only improves the light transmittance and brightness, but also improves the light transmittance uniformity.

[0030] S5, using another base film as the base film layer 2 6, applying adhesive under the base film layer 2 6 to bond the base film layer 2 6 and the anti-peep layer 1 5, thereby forming an adhesive layer 7 between the base film layer 2 6 and the anti-peep layer 1 5. The thickness of the adhesive layer 7 is 10-20 μm. The base film layer 2 6 and the base film layer 1 3 are aligned in direction.

[0031] The anti-peep layer 2 8 is prepared on the base film layer 2 6 by the same method as the anti-peep layer 1 5 . However, the anti-peep layer 1 5 and the anti-peep layer 2 8 have different directions. Specifically, the anti-peep structure 2 in the anti-peep layer 1 5 can be obtained by rotating the anti-peep structure 2 in the anti-peep layer 2 8 by 90°.

[0032] S6. Use a micro-concave roller with an anti-glare structure 9 to apply the anti-glare coating on the upper surface of the second anti-peeping layer 8 by hard pressure transfer, and cure it under ultraviolet light or at high temperature to obtain the anti-glare layer 10.

[0033] The anti-peep film is prepared by the above steps, referring to Figure 1 .

[0034] In addition, refer to Figure 2 and Figure 3 , the anti-glare structure 9 presents multiple annular peaks 11 and valleys 12. This corrugated design can effectively scatter light in different directions. When light passes through these irregular surfaces, it will be dispersed or reflected, reducing the direct reflected light entering the human eye, thereby 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 anti-peeping layer (anti-peeping layer 1 5 and anti-peeping layer 2 8) itself is designed to limit the transmission of light at certain angles through a special microstructure (light passes through the light-transmitting material 4, and the anti-peeping structure 2 limits the transmission of light to play an anti-peeping role). After the anti-glare structure 9 is pressed on the base film layer 2 6, the incident and transmission angles of the light will be further controlled. This superposition effect can enhance the anti-glare performance while maintaining the anti-peeping function.

[0035] Example 2 In this embodiment, a specific preparation method of the anti-glare coating is given. By improving the anti-glare coating, the anti-glare effect is further improved. The specific steps are as follows: Preparation of modified barium titanate microspheres: 1. Raw materials: Polyvinylpyrrolidone: PVP, purity 99%; Sodium hydroxide: purity 99%; Citric acid: purity 99%; Barium titanate microspheres: particle size 50-80nm, purity 99%, can be purchased from Xi'an Qiyue Biotechnology Co., Ltd.

[0036] 2. Activation of barium titanate microspheres: Add 10 g of barium titanate microspheres into 50 ml of deionized water, ultrasonically disperse for 15 minutes, add 0.1 g of sodium hydroxide, stir at 60°C for 1 hour, centrifuge, wash 3 times, and dry at 80°C for 2 hours to obtain activated barium titanate microspheres.

[0037] 3. Prepare citric acid solution: dissolve 0.25 g of citric acid in 30 ml of deionized water, adjust the pH to 4.5-5.0, add 0.2 g of PVP, stir at room temperature for 30 minutes to completely dissolve, and obtain a citric acid solution.

[0038] 4. Modification: 1) First stage modification: disperse the activated barium titanate microspheres in 20 ml of deionized water, ultrasonically treat for 20 minutes, slowly add citric acid solution, stir at 45°C for 2 hours, and maintain the pH at 4.5-5.0; 2) Second stage modification: heat to 60°C, continue stirring at 400rpm for 3 hours; 3) Post-treatment: after the modification, centrifuge at 8000rpm for 15 minutes, wash with deionized water or anhydrous ethanol, vacuum dry, and store at room temperature to obtain modified barium titanate microspheres.

[0039] It should be noted that the modified barium titanate microspheres have a three-layer structure of "core-shell-brush". Inner layer: citric acid and barium titanate form a coordination bond as the core; middle layer: PVP and citric acid form a shell through hydrogen bonding; outer layer: PVP hydrophilic groups extend outward to form a brush-like structure to form a molecular brush. Synergistic effect: citric acid provides multi-site coordination, PVP provides steric hindrance, citric acid forms a dense inner layer protection, PVP forms an extended outer layer shielding, and produces multi-layer three-dimensional protection, resulting in a synergistic effect: improving dispersion stability and improving interface compatibility.

[0040] Preparation of anti-glare coating: 1. Raw materials: Tetraethyl orthosilicate: TEOS, purity 99%; Ethanol: purity 99%; Polyethylene glycol: PEG, molecular weight 10000, purity 99%; Hydrochloric acid: purity 99%.

[0041] 2. Preparation: Mix 40g of ethyl 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 an anti-glare coating.

[0042] It should be noted that the curing method of the anti-glare coating is high temperature curing.

[0043] It is further explained that tetraethyl orthosilicate is used as the matrix to provide film-forming effect, and barium titanate microspheres form a microscopic scattering structure in the coating, which reduces surface reflection by regulating scattering; at the same time, it maintains better light transmittance.

[0044] The film-forming mechanism of the coating: sol stage: the components are evenly dispersed; gel stage: a network structure is formed; drying stage: the solvent evaporates to form a dense film.

[0045] The components work together: tetraethyl orthosilicate and modified barium titanate microspheres form an organic-inorganic hybrid structure; specifically, the barium titanate microspheres provide scattering function, and the silicon-oxygen network provides a transparent matrix, and the two work together to achieve high light transmittance and low reflection. In addition, polyethylene glycol provides plasticization and improves the interface bonding, while ethanol and hydrochloric acid adjust the viscosity and catalysis, ultimately forming a multi-level network structure to improve the overall performance.

[0046] Example 3 Different from Example 2, the barium titanate microspheres are not modified, specifically as follows: Preparation of anti-glare coating: 1. Raw materials: Tetraethyl orthosilicate: TEOS, purity 99%; Ethanol: purity 99%; Polyethylene glycol: PEG, molecular weight 10000, purity 99%; Hydrochloric acid: purity 99%; Barium titanate microspheres: particle size 50-80nm, purity 99%, can be purchased from Xi'an Qiyue Biotechnology Co., Ltd.

[0047] 2. Preparation: Mix 40 g of ethyl orthosilicate with 160 g of ethanol, add 20 ml of 1 M hydrochloric acid, stir for 2 hours, add 11 g of polyethylene glycol, stir evenly, then add 10 g of barium titanate microspheres, stir evenly to obtain an anti-glare coating.

[0048] It should be noted that the curing method of the anti-glare coating is high temperature curing.

[0049] Example 4 The anti-peep film was prepared by using the method of Example 1 and the anti-glare coating prepared in Example 2. The anti-glare structure 9 is a concentric circle structure.

[0050] Example 5 The anti-peep film was prepared by using the method of Example 1 and the anti-glare coating prepared in Example 3. The anti-glare structure 9 is a concentric circle structure.

[0051] Test: The privacy films of Examples 4 and 5 were tested according to CIE 117-1995, and the glare value was evaluated by the UGR formula specified therein.

[0052] in: 1. Light source: D65 standard light source.

[0053] 2. Observation parameters: Observation distance: 2m; Observation height: 1.2m; Observation angle range: 0°-45°; Field of view: 1°.

[0054] 3. Environmental parameters: Room temperature: 23±2℃; Relative humidity: 45±5%; Background brightness: ≤10cd / m²; Ambient illumination: <1 Lux.

[0055] 4. Measurement point arrangement: 1) Background brightness measurement: center point, 4 points on the top, bottom, left, and right sides, and 4 points on the four corners. 2) Sample brightness measurement: 3×3 grid points; margin: 1 / 6 of the sample size; repeat 3 times for each point.

[0056] 5. Angle settings: 1) Horizontal direction: 0°, ±15°, ±30°, ±45°. 2) Vertical direction: 0°, 15°, 30°, 45°.

[0057] Experimental results: Table 1 UGR value of Example 4

[0058] Table 2 UGR value of Example 5

[0059] It can be seen from the above that the glare values ​​UGR of Example 4 and Example 5 are both less than 12, and Example 4 has a lower glare value than Example 5, and performs better in terms of anti-glare effect.

[0060] In Example 4, compared with the barium titanate microspheres (unmodified) in Example 5, the modified barium titanate microspheres are more evenly dispersed in the coating matrix, reducing the aggregation of particles and improving the stability of the coating.

[0061] Finally, it should be noted that the above 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 aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Privacy film, characterized in that: The base film layer comprises a first base film layer, a first privacy layer is provided on the upper surface of the first base film layer, an adhesive layer is provided on the upper surface of the first privacy layer, a second base film layer is provided on the upper surface of the adhesive layer, a second privacy layer is provided on the upper surface of the second base film layer, and an anti-glare layer is provided on the upper surface of the second privacy layer; The base film layer 1 and the base film layer 2 both include a base film, the anti-peeping layer 1 and the anti-peeping layer 2 both include a plurality of trapezoidal anti-peeping structures, light-transmitting materials are filled between the anti-peeping structures, the anti-glare layer includes an anti-glare structure; the anti-glare structure includes a concentric circle structure and a quadrangular pyramid structure; The anti-glare structure is obtained by curing the anti-glare coating, and the anti-glare coating is prepared by mixing raw materials. The raw materials include 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.

2. The privacy film according to claim 1, characterized in that: For the concentric circle structure, the concentric circles are formed by multiple circles one layer inside another, sharing a common center, the outermost circle of the concentric circles circumscribes a regular hexagon, and the diameter of the outermost circle of the concentric circles is 1~3mm.

3. The privacy film according to claim 1, characterized in that: For the concentric circle structure, the positions of the concentric circles are convex to form peaks, and there are depressions between the circles to form valleys. The depth of the depressions is 20-25μm, the distance between two adjacent peaks is 80-90μm, and the distance between two adjacent valleys is 80-90μm.

4. The privacy film according to claim 1, characterized in that: The base film layer 2 and the base film layer 1 are in the same direction, while the anti-peep layer 1 and the anti-peep layer 2 are in different directions; the thickness of the adhesive layer is 10-20 μm.

5. A method for improving the anti-glare function of a privacy film, characterized in that: The steps include: Preparation of a micro-concave roller with an anti-peeping structure: taking a metal roller blank and performing laser engraving to engrave a micro-concave roller with an anti-peeping structure, and then performing chrome plating on the surface of the micro-concave roller to obtain a micro-concave roller with an anti-peeping structure; Preparation of a micro-concave roller with an anti-glare structure: taking a metal roller blank and performing laser engraving to engrave a micro-concave roller with an anti-glare structure, and then performing chrome plating on the surface of the micro-concave roller to obtain a micro-concave roller with an anti-glare structure; Using a base film as the first base film layer, a micro-concave roller with an anti-peeping structure applies the main coating on the upper surface of the first base film layer by a hard pressure transfer method, and solidifies it; filling a light-transmitting material between the anti-peeping structure and the anti-peeping structure, and solidifying it; the anti-peeping structure and the light-transmitting material together constitute the first anti-peeping layer; Using another base film as the second base film layer, applying adhesive under the second base film layer to adhere the second base film layer to the first privacy protection layer, so as to form an adhesive layer between the second base film layer and the first privacy protection layer; The micro-concave roller with the anti-peeping structure applies the main coating to the upper surface of the second base film layer by hard pressure transfer, solidifies, fills the light-transmitting material between the anti-peeping structure and the anti-peeping structure, solidifies, and the anti-peeping structure and the light-transmitting material together constitute the second anti-peeping layer; The anti-glare coating is applied on the upper surface of the second anti-peeping layer by a micro-concave roller with an anti-glare structure through a hard pressure transfer method, and then cured to obtain an anti-glare layer; The overall structure prepared by the above steps is the privacy film according to any one of claims 1 to 4.

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

7. The method for improving the anti-glare function of the privacy film according to claim 5, characterized in that: The preparation method of modified barium titanate microspheres comprises the following steps: dissolving citric acid, adding PVP, stirring, and obtaining a citric acid solution; adding the barium titanate microspheres into water, ultrasonically dispersing, adding sodium hydroxide, stirring, centrifuging, washing, and drying, and obtaining activated barium titanate microspheres; dispersing the activated barium titanate microspheres in water, ultrasonically treating, slowly dripping the citric acid solution, stirring, heating, and continuing to stir for modification; after the modification is completed, centrifuging, washing, and drying, and obtaining the modified barium titanate microspheres.

8. The method for improving the anti-glare function of the privacy film according to claim 5, characterized in that: The main coating includes light-absorbing materials and light-shielding agents; the light-absorbing materials or light-shielding agents include acrylic resin, polyurethane resin, and polyester resin.

9. The method for improving the anti-glare function of the privacy film according to claim 5, characterized in that: Translucent materials include translucent ink, translucent acrylic, graphite, PMMA, and PBMA.

10. The method for improving the anti-glare function of the privacy film according to claim 5, characterized in that: The particle size of barium titanate microspheres is 50-80nm; the materials of the base film include PET and PC.

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