Privacy film and privacy display screen

Abstract

The present invention discloses an anti-peeping film and an anti-peeping display screen. The anti-peeping film comprises, in sequence, a first conductive substrate layer, an anti-peeping layer, and a second conductive substrate layer. The anti-peeping layer comprises alternating light-transmitting regions and color-changing regions, the color-changing regions being formed by curing an electrochromic coating liquid. The electrochromic coating liquid comprises, by weight, 20 to 80 parts of acrylic resin, 20 to 80 parts of acrylate monomer, 0.01 to 5 parts of an auxiliary agent, 5 to 30 parts of a color-changing material, and 1 to 10 parts of a photoinitiator. The anti-peeping film of the present invention uses acrylic resin, acrylate monomer, and color-changing material as main raw materials to form the color-changing regions. The alternating color-changing regions and light-transmitting regions form the anti-peeping layer. The anti-peeping film is applied to an anti-peeping display screen. The voltage can be adjusted to switch the anti-peeping film between non-peeping and anti-peeping modes. The film has a good anti-peeping effect when used for anti-peeping without affecting the brightness of the display screen. In addition, the color-changing regions formed after curing the electrochromic coating liquid have moderate hardness and elasticity, making the anti-peeping film less likely to crack when bent.

Description

Technical Field

[0001] The present invention belongs to the technical field of privacy films, and in particular relates to a privacy film and a privacy display screen. Background Art

[0002] With the popularization of electronic devices, anti-peep films are also widely used on the display screens of electronic devices to protect the information displayed on the display screens. Specifically, they meet the viewing needs when looking straight ahead, but the screen information cannot be seen clearly when deviated from a certain angle, thereby better protecting the user's personal privacy in public spaces.

[0003] While privacy-preventing displays are currently available on the market, most utilize silicone adhesive to secure the screen to the display surface. However, the screen itself has low transmittance, which can negatively impact the display's brightness. Furthermore, the absorbent layer of existing privacy screens is relatively hard, making them prone to cracking when bent, impacting both the appearance and the clarity of the display.

[0004] Therefore, there is an urgent need for an anti-peep film and an anti-peep display screen to solve the deficiencies of the existing technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an anti-peeping film, which is applied to an anti-peeping display screen. The voltage can be adjusted to switch the anti-peeping film between non-peeping and anti-peeping. When anti-peeping, it has a good anti-peeping effect without affecting the brightness of the display screen, and is not prone to cracks when bent.

[0006] Another object of the present invention is to provide an anti-peeping display screen that can quickly switch between an anti-peeping mode and a non-anti-peeping mode. In the anti-peeping mode, the screen has a good anti-peeping effect without affecting the brightness of the screen, and is not prone to cracks when bent.

[0007] To achieve the above objectives, the present invention provides an anti-peeping film, which comprises a first conductive substrate layer, an anti-peeping layer, and a second conductive substrate layer in sequence. The anti-peeping layer comprises alternating light-transmitting areas and color-changing areas, and the color-changing areas are prepared by curing an electrochromic coating liquid; the electrochromic coating liquid comprises, by weight, 20 to 80 parts of acrylic resin, 20 to 80 parts of acrylate monomer, 0.01 to 5 parts of an auxiliary agent, 5 to 30 parts of a color-changing material, and 1 to 10 parts of a photoinitiator.

[0008] Compared with the prior art, the privacy film of the present invention uses acrylic resin, acrylate monomer, and color-changing material as the main raw materials of the electrochromic coating liquid to obtain the color-changing area. The alternating color-changing areas and light-transmitting areas form the privacy layer. When the color-changing area is colorless, that is, when both the color-changing area and the light-transmitting area are light-transmitting, it can achieve a non-privacy function; when the color-changing area is colored, that is, when the color-changing area absorbs light and the light-transmitting area is light-transmitting, it can achieve a privacy function. Furthermore, the privacy film can be directly applied to the inside of the privacy display screen, so it does not affect the brightness of the display screen, and a voltage can be applied to the first conductive substrate layer and the second conductive substrate layer to generate a voltage change between the two. The color-changing area changes to colorless or colored according to the voltage change, thereby switching it between the non-privacy mode and the privacy mode. In addition, the color-changing area formed after the electrochromic coating liquid of the present invention is cured has moderate hardness and elasticity, so that the privacy film is not prone to cracks when it is bent.

[0009] Furthermore, the present invention uniformly mixes 20 to 80 parts of acrylic resin, 20 to 80 parts of acrylate monomer, 0.01 to 5 parts of auxiliary agent, 5 to 30 parts of color-changing material, and 1 to 10 parts of photoinitiator to prepare an electrochromic coating liquid.

[0010] Furthermore, the acrylic resin of the present invention is selected from at least one of aliphatic polyurethane acrylates, aromatic polyurethane acrylates, polyester acrylates, and acrylic resins having a functionality of 1 to 3. Specifically, the glass transition temperature Tg of the acrylic resin is less than 0°C, and the viscosity of the acrylic resin is 5,000 to 50,000 cps at 25°C. More specifically, the acrylic resin may be at least one of difunctional aliphatic polyurethane acrylates, aliphatic polyurethane hexaacrylates, difunctional aromatic polyurethane acrylates, difunctional polyester acrylates, and difunctional pure acrylates. The inventors of the present application discovered during the invention process that if the functionality of the acrylic resin is greater than 3, the cross-linking reaction speed during curing is fast, which increases the hardness of the color-changing layer and thus affects the bending performance. In addition, if the functionality of the acrylic resin is greater than 3, the adhesion of the color-changing layer to the first conductive substrate layer will also be poor.

[0011] Furthermore, the acrylate monomer of the present invention has a functionality of 1 to 3. Specifically, the acrylate monomer can be a difunctional acrylate monomer, such as 1,6-diol diacrylate (HDDA). Of course, the acrylate monomer can also be a monofunctional acrylate monomer, such as isobornyl acrylate (IBOA). Preferably, the acrylate monomer of the present invention is a mixture of HDDA and IBOA.

[0012] Furthermore, the photoinitiator of the present invention is at least one of a cleavage-type free radical photoinitiator, a hydrogen abstraction-type photoinitiator, and a cationic photoinitiator. Specifically, the photoinitiator has an initiation wavelength of 300-400 nm. More specifically, the photoinitiator can be selected from at least one of photoinitiator 184 and photoinitiator TPO. Selecting photoinitiator 184 or photoinitiator TPO with an initiation wavelength of 300-400 nm can improve the curing effect of the electrochromic coating liquid at the contact portion with the mold, thereby improving mold release performance.

[0013] Furthermore, the additive of the present invention is at least one of a leveling agent, an adhesion promoter, a slip agent, and a rheological additive. The additive can improve the surface smoothness of the color change area. Specifically, the additive of the present invention is BYK-3500, but the additive of the present invention is not limited thereto. Other additives, such as BYK-346 and BYK-333, may also be used.

[0014] Furthermore, the color-changing material of the present invention is selected from at least one of tungsten trioxide, polythiophenes and their derivatives, polyaniline, viologens, tetrathiafulvalene, carbon black, and metal phthalocyanine compounds. Specifically, the color-changing material of the present invention is tungsten trioxide, polyaniline, or carbon black.

[0015] Furthermore, the refractive index of the color-changing area of ​​the present invention is 1.4 to 1.6. This configuration can ensure that the privacy film has a better privacy protection effect in the privacy protection mode.

[0016] Furthermore, the first conductive substrate layer and the second conductive substrate layer of the present invention are each independently selected from at least one of an ITO film, a nanosilver wire conductive film and a metal mesh conductive film.

[0017] Furthermore, the light-transmitting area of ​​the present invention is air. The refractive index of air is 1.0003, so the light-transmitting area can achieve a good light-transmitting effect.

[0018] To achieve the above objectives, the present invention further provides an anti-peeping display screen, comprising a display panel and the above-mentioned anti-peeping film, wherein the anti-peeping film is disposed inside the display panel.

[0019] Compared with the prior art in which the privacy film is set on the surface of the display panel, the privacy film of the present invention is set inside the display panel. When in the privacy mode, it will not affect the brightness of the display screen and also has a good privacy effect. At the same time, the voltage can be adjusted so that the privacy display screen can quickly switch between the privacy mode and the non-privacy mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the privacy film of the present invention. DETAILED DESCRIPTION

[0021] To further understand the present invention, the following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] All raw materials of the present invention are not particularly limited in their sources and can be purchased from the market or prepared according to conventional methods well known to those skilled in the art.

[0023] Please see Figure 1 The privacy film 100 of the present invention comprises a first conductive substrate layer 11, a privacy layer 12, and a second conductive substrate layer 13 in sequence. The privacy layer 12 comprises light-transmitting areas 121 and color-changing areas 122 arranged alternately. The color-changing areas 122 are made by curing an electrochromic coating liquid. Specifically, the present invention applies an electrochromic coating liquid on a mold having a plurality of microstructures, presses the mold and the first conductive substrate layer 11, and after the electrochromic coating liquid is cured, demolds the mold to transfer the microstructure to the first conductive substrate layer 11 to form the color-changing areas 122. The microstructure can be Figure 1 In the rectangular shape shown in FIG, the cavity (i.e., air) formed between two adjacent color-changing regions 122 constitutes the light-transmitting region 121, i.e., the light-transmitting regions 121 and the color-changing regions 122 are arranged alternately. It is also necessary to note that the microstructure can also be trapezoidal, semicircular, or arc-shaped, and those skilled in the art can make specific choices based on actual needs.

[0024] The difunctional aliphatic polyurethane acrylate in the embodiment was purchased from Changxing, Taiwan, model 6123; the aliphatic polyurethane hexaacrylate was purchased from Solmer, model SU58; the difunctional aromatic polyurethane acrylate was purchased from Changxing, Taiwan, model 6121F-80NT; the difunctional polyester acrylate was purchased from Changxing, Taiwan, model DR-E527; and the difunctional pure acrylate was purchased from Changxing, Taiwan, model DR-872.

[0025] Example 1

[0026] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a nano-silver wire conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 50 parts of difunctional aliphatic polyurethane acrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 parts of BYK-3500, 15 parts of tungsten trioxide, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0027] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0028] Example 2

[0029] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a nano-silver wire conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 50 parts of aliphatic polyurethane hexaacrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 parts of BYK-3500, 15 parts of tungsten trioxide, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0030] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0031] Example 3

[0032] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a nano-silver wire conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 50 parts of difunctional aromatic polyurethane acrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 parts of BYK-3500, 15 parts of tungsten trioxide, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0033] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0034] Example 4

[0035] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a nano-silver wire conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 30 parts of difunctional aliphatic polyurethane acrylate, 20 parts of difunctional polyester acrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 part of BYK-3500, 15 parts of tungsten trioxide, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0036] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0037] Example 5

[0038] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a nano-silver wire conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 30 parts of difunctional aliphatic polyurethane acrylate, 20 parts of difunctional pure acrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 parts of BYK-3500, 15 parts of tungsten trioxide, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0039] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0040] Example 6

[0041] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a nano-silver wire conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 50 parts of difunctional aliphatic polyurethane acrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 parts of BYK-3500, 15 parts of polyaniline, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0042] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0043] Example 7

[0044] This embodiment provides an anti-peeping film, which includes an ITO film layer, an anti-peeping layer, and a nano-silver wire conductive film in sequence. The anti-peeping layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 50 parts of difunctional aliphatic polyurethane acrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 parts of BYK-3500, 10 parts of polyaniline, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0045] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0046] Example 8

[0047] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a nano-silver wire conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 50 parts of difunctional aliphatic polyurethane acrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 parts of BYK-3500, 7.5 parts of tungsten trioxide, 7.5 parts of polyaniline, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0048] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0049] Example 9

[0050] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a nano-silver wire conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 10 parts of aliphatic polyurethane hexaacrylate, 40 parts of difunctional aromatic polyurethane acrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 parts of BYK-3500, 15 parts of polyaniline, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0051] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0052] Example 10

[0053] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a nano-silver wire conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 30 parts of difunctional aromatic polyurethane acrylate, 20 parts of difunctional pure acrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 parts of BYK-3500, 15 parts of polyaniline, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0054] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0055] Example 11

[0056] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a nano-silver wire conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 50 parts of difunctional aliphatic polyurethane acrylate, 20 parts of HDDA, 8.5 parts of IBOA, 0.5 parts of BYK-3500, 15 parts of high-pigment carbon black with a particle size D90 ≤ 500 nm, 3 parts of photoinitiator 184, and 3 parts of photoinitiator TPO.

[0057] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0058] Example 12

[0059] This embodiment provides an anti-peep film, which includes an ITO film layer, an anti-peep layer, and a metal grid conductive film in sequence. The anti-peep layer includes alternating light-transmitting areas and color-changing areas. The color-changing areas are made by curing an electrochromic coating liquid. The electrochromic coating liquid includes, by weight, 60 parts of difunctional aliphatic polyurethane acrylate, 20 parts of HDDA, 10 parts of IBOA, 1 part of BYK-3500, 20 parts of tungsten trioxide, 3 parts of photoinitiator 184, and 4 parts of photoinitiator TPO.

[0060] The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

[0061] The privacy films of Examples 1 to 12 were subjected to the following tests, and the test results are shown in Table 1.

[0062] Mold release: After the electrochromic coating liquid solidifies to form a color-changing area, demolding is performed and the demolding condition is observed. If demolding is possible or there is a slight demolding sound or no demolding sound, it is OK; otherwise, it is NG.

[0063] Hardness: The hardness of the color-changing area formed after the electrochromic coating liquid is cured is measured using a Shore hardness tester. Fracture performance test: The elongation at break and elastic modulus of the color-changing area formed after the electrochromic coating liquid is cured are measured using a universal material testing machine.

[0064] Anti-peeping effect test: The anti-peeping films of Examples 1 to 12 were placed inside a display panel to produce an anti-peeping display screen. After power was turned on, the anti-peeping effect was observed. If the anti-peeping function could be achieved, it was OK; otherwise, it was NG.

[0065] Table 1

[0066]

[0067]

[0068] As shown in Table 1, the privacy film of the present invention uses acrylic resin, acrylate monomer, color-changing material, additive, color-changing material, and photoinitiator as raw materials for the electrochromic coating liquid to produce the color-changing region. The color-changing region formed after curing of the electrochromic coating liquid of the present invention has a hardness of 60-85A and an elastic modulus of 3.8-4.32MPa. Therefore, the color-changing region has moderate hardness and elasticity, making the privacy film less susceptible to cracking when bent. Furthermore, when applied to a privacy screen, the privacy film does not affect the screen's brightness. The color-changing region changes colorless or colored depending on the voltage, allowing it to switch between non-privacy mode and privacy mode, achieving a good privacy protection effect.

[0069] Comparing Example 1 with Example 2, it can be found that the color-changing area of ​​Example 2 has a higher hardness. This also indicates that when the acrylic resin is selected from aliphatic polyurethane hexaacrylate, that is, when the functionality of the acrylic resin is greater than 3, the color-changing area formed after the electrochromic coating liquid is cured will be slightly harder, which is not conducive to the bending of the privacy film. Therefore, the acrylic resin of the present application is preferably selected from at least one of aliphatic polyurethane acrylates, aromatic polyurethane acrylates, polyester acrylates and acrylic resins with a functionality of 1 to 3.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A privacy film, characterized in that: The invention comprises, in sequence, a first conductive substrate layer, an anti-peeping layer, and a second conductive substrate layer. The anti-peeping layer comprises alternating light-transmitting regions and color-changing regions. The color-changing regions are prepared by curing an electrochromic coating liquid. The electrochromic coating liquid comprises, by weight, 20 to 80 parts of acrylic resin, 20 to 80 parts of acrylate monomers, 0.01 to 5 parts of additives, 5 to 30 parts of color-changing materials, and 1 to 10 parts of photoinitiators. The acrylic resin is at least one of a difunctional aliphatic polyurethane acrylate, a difunctional aromatic polyurethane acrylate, a difunctional polyester acrylate, and a difunctional pure acrylate. The acrylate monomer is a mixture of HDDA and IBOA. The photoinitiator is a mixture of photoinitiator 184 and photoinitiator TPO. The color-changing material is a mixture of tungsten trioxide and polyaniline. The refractive index of the color-changing region is 1.4 to 1.

6. The electrochromic coating liquid is applied to a mold having a plurality of rectangular structures, the mold is pressed together with the first conductive substrate layer, and then the electrochromic coating liquid is applied to a mold at a wavelength of 300-400 nm and a concentration of 800-1000 mJ / cm 2 The rectangular structure is cured under light energy and demoulded after curing, thereby transferring the rectangular structure to the first conductive substrate layer to form a color-changing area. A cavity is formed between two adjacent rectangular structures, and the air in the cavity constitutes a light-transmitting area.

2. The privacy film according to claim 1, wherein: The auxiliary agent is at least one of a leveling agent, an adhesion promoter, a slip agent and a rheological additive.

3. The privacy film according to claim 1, wherein: The first conductive substrate layer and the second conductive substrate layer are each independently selected from at least one of an ITO film, a nanosilver wire conductive film, and a metal mesh conductive film.

4. The privacy film according to claim 1, wherein: The light-transmitting area is air.

5. An anti-peeping display screen, characterized in that: The device comprises a display panel and the privacy film according to any one of claims 1 to 4, wherein the privacy film is arranged inside the display panel.

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