CN111627319B - Peep-proof film - Google Patents

Abstract

A privacy film, comprising a light-transmissive substrate layer, a light-transmissive transmission layer and an opaque light-shielding layer, wherein the transmission layer is disposed on the substrate layer, and the transmission layer is provided with a plurality of rows of first transmission parts arranged at intervals from each other, and a hollow part is formed between the first transmission parts; and the light-shielding layer is disposed on the outer surface of the first transmission part. For the privacy film of the present invention, since the light-shielding layer is coated on the surface of the first transmission part instead of filling the hollow part between two adjacent first transmission parts, the volume ratio of the light-shielding layer to the light-transmissive first transmission part is greatly reduced, thereby increasing the transmittance of the privacy film, and improving the overall brightness of the privacy film, thereby improving the display effect. The transmittance of the privacy film of the present invention is as high as 70% to 90%, and it has the characteristics of high transmittance and simple structure. It has strong practicality and should be vigorously promoted.

Description

Privacy film

[Technical field]

The invention relates to an anti-peep film, in particular to an anti-peep film with high transmittance.

[Background technology]

Privacy film is the abbreviation of anti-peeping (viewing) film or privacy protection film. Another common name is privacy film; English name: Privacy protection film or: Privacy filter. The main function of privacy film is to protect the privacy of the screen and prevent peeping. It is usually used on display screens to protect the information on the screen, so that the screen information can be seen from the front but not from the side, preventing people around from seeing the screen content clearly, thereby protecting privacy and preventing peeping.

The privacy film is usually realized by a grating structure arranged in parallel. At a certain angle, the light is blocked by the grating and cannot pass through, thereby changing the wide viewing angle of the display screen to a narrow viewing angle, and making the screen information invisible from the side. Existing privacy films usually fill light-absorbing substances such as black ink between two transparent microstructures, such as the privacy film structure of patent ZL201410063204.X. This privacy film, because the black ink is directly filled between two adjacent microstructures, the volume of the ink and the transparent structure is relatively large, usually about 1:3 to 1:2, so it will greatly affect the transmittance of the film. The actual transmittance of this privacy film is usually between 50% and 70%, and its overall color is darker, grayish black, which will affect the display effect to a certain extent. Therefore, if the transmittance of the privacy film can be improved, it will be able to better meet the use needs.

[Summary of the invention]

The present invention aims to solve the above problems and provide a privacy film with improved transmittance.

To achieve the above-mentioned purpose, the present invention provides an anti-peep film, characterized in that it includes a light-transmissive substrate layer, a light-transmissive transmission layer and a light-impermeable shading layer, wherein the transmission layer is arranged on the substrate layer, and the transmission layer is provided with a plurality of rows of first transmission parts arranged at intervals from each other, and hollow parts are formed between the first transmission parts; and the shading layer is arranged on the outer surface of the first transmission part.

Further, a viewing angle of the substrate layer viewed through the hollow portion is a first angle A; a viewing angle of the substrate layer viewed through the first transmission portion is a second angle B; and the first angle A is greater than the second angle B.

Furthermore, the hollow portion is filled with a light-transmitting material, the light-transmitting material forms a second transmission portion in the hollow portion, and the light-shielding layer is distributed between the first transmission portion and the second transmission portion.

Further, a viewing angle of the substrate layer viewed through the second transmission portion is a third angle C; a viewing angle of the substrate layer viewed through the first transmission portion is a fourth angle D; and the third angle C is consistent with the fourth angle D or inconsistent with it.

Furthermore, it also includes a functional layer, which is arranged on a side of the transmission layer opposite to the substrate layer and is parallel to and spaced from the substrate layer.

Furthermore, a spatial volume ratio of the light-shielding layer to the first transmission portion is less than 1:10.

Furthermore, the thickness of the shading layer is less than 0.01MM, the height of the first transmission portion is less than 0.5MM, and the width of the first transmission portion is less than 0.1MM.

Furthermore, the light shielding layer is formed by coating ink on two opposite surfaces of the first transmission portion.

The beneficial contribution of the present invention is that it effectively solves the above-mentioned problems. The privacy film of the present invention includes a substrate layer and a transmission layer, the transmission layer is provided with first transmission parts and hollow parts arranged at intervals, and a light-shielding layer is provided on the surface of the first transmission part. Since the light-shielding layer is coated on the surface of the first transmission part instead of filling the hollow part between two adjacent first transmission parts, the volume ratio of the light-shielding layer to the light-transmitting first transmission part is greatly reduced, thereby increasing the transmittance of the privacy film and improving the overall brightness of the privacy film, thereby improving the display effect. The privacy film of the present invention has the characteristics of high transmittance and simple structure, and it has strong practicality and should be vigorously promoted.

【Brief Description of the Drawings】

FIG1 is a schematic diagram of the principle of Example 1.

FIG. 2 is a schematic diagram of the principle of Embodiment 2.

Among them, there are a base material layer 1 , a transmission layer 2 , a first transmission portion 21 , a hollow portion 22 , a light shielding layer 3 , a second transmission portion 4 , and a functional layer 5 .

[Specific implementation method]

The following examples are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

As shown in FIGS. 1 and 2 , the privacy film of the present invention includes a substrate layer 1 , a transmission layer 2 , and a light shielding layer 3 .

The substrate layer 1 is made of a light-transmitting material, which is light-transmitting, and is usually made of PET, PVC, EVA, PC, PMMA, TPU, glass, etc. In this embodiment, the substrate layer 1 is made of PET material. The thickness of the substrate layer 1 is about 0.1MM.

As shown in FIGS. 1 and 2 , the transmission layer 2 is disposed on the substrate layer 1, and includes a plurality of rows of first transmission parts 21 arranged at intervals from each other, and the first transmission parts 21 are hollow to form a hollow part 22. The first transmission part 21 is in the shape of an elongated strip, and extends from one end of the substrate layer 1 to the other end of the substrate layer 1. The cross section of the first transmission part 21 is trapezoidal, which can be an isosceles trapezoid or an isosceles trapezoid. In this embodiment, the cross section of the first transmission part 21 is preferably set to be an isosceles trapezoid. In this embodiment, the wider lower bottom of the first transmission part 21 is close to the substrate layer 1, and the narrower upper bottom of the first transmission part 21 is far away from the substrate layer 1. Correspondingly, the cross section of the hollow part 22 is also trapezoidal: its narrower upper bottom is flush with the lower bottom of the first transmission part 21, and its wider lower bottom is flush with the upper bottom of the first transmission part 21, forming an inverted trapezoid.

As shown in FIG. 1 and FIG. 2 , for the transmission layer 2 , the first transmission parts 21 are arranged uniformly: the sizes and shapes of the first transmission parts 21 are consistent, and the distances between them are consistent.

As shown in Figures 1 and 2, the transmission layer 2 is made of a light-transmitting material, which is light-transmitting, and is usually made of PET, PVC, EVA, PC, PMMA, TPU, glass, etc. In this embodiment, the transmission layer 2 is formed by curing a transparent UV glue.

The height of the first transmission part 21 is less than 0.5MM, and in this embodiment, its preferred range is 0.09MM to 0.13MM. The width of the first transmission part 21, that is, the width of the upper and lower bases of the first transmission part 21 is less than 0.1MM, and in this embodiment, its upper base is preferably 0.01MM, and its lower base is preferably 0.02MM.

As shown in FIGS. 1 and 2 , the light shielding layer 3 is provided on the two opposite outer surfaces of the first transmission part 21, and is made of an opaque material. In this embodiment, the light shielding layer 3 is formed by black ink being provided on the two opposite surfaces of the first transmission part 21. In other embodiments, the light shielding layer 3 may also be made of an opaque material such as gray ink or white ink. The thickness of the light shielding layer 3 is less than 0.01MM, and the volume ratio of the light shielding layer 3 to the first transmission part 21 is less than 1:10.

In order to facilitate processing and improve transmittance, the angle between the two side surfaces of the first transmission portion 21 and the normal line of the substrate layer 1 should be less than ±5°. When the angle between the two side surfaces of the first transmission portion 21 and the normal line of the substrate layer 1 is smaller, the light shielding layer 3 disposed on the surface of the first transmission portion 21 has less influence on the transmittance of the privacy film, and the transmittance of the privacy film is higher.

In order to more clearly describe the structure of the present invention, different embodiments are described below:

Example 1

As shown in FIG1 , in this embodiment, the light shielding layer 3 is disposed on the side of the first transmission portion 21, and the upper bottom surface of the first transmission portion 21 is not provided with the light shielding layer 3, so that light can be transmitted from the top of the first transmission portion 21, that is, the upper bottom surface of the first transmission portion 21. In addition, light can also be transmitted from the hollow portion 22.

As shown in FIG1 , since the light shielding layer 3 is distributed between the first transmission part 21 and the hollow part 22, the viewing angle of the screen content on one side of the substrate layer 1 through the hollow part 22 and the first transmission part 21 is limited; wherein, the viewing angle of the substrate layer 1 through the hollow part 22 is a first angle A, and the viewing angle of the substrate layer 1 through the first transmission part 21 is a second angle B; the first angle A is greater than the second angle B. Since the refractive index of the hollow part 22 is about 1, and the refractive index of the first transmission part 21 is greater than 1, which is usually 1.4 to 1.6, when the first angle A is greater than the second angle B, the content of the same area can be seen when the screen is viewed through the hollow part 22 and the first transmission part 21, thereby ensuring that the same visual effect can be produced when the screen is viewed through the first transmission part 21 and the hollow part 22.

In addition, a functional layer 5 may be provided on the side of the transmissive layer 2 opposite to the substrate layer 1. The functional layer 5 may be provided according to the desired effect. For example, the functional layer 5 may be an anti-glare layer; for another example, the functional layer 5 may be used to enhance the overall hardness of the privacy film. For another example, the functional layer 5 may be a transparent layer that is the same as the substrate layer 1. The functional layer 5 may enhance the film properties of the privacy film and protect the transmissive layer 2.

The functional layer 5 can be compounded on the top of the first transmission portion 21 of the transmission layer 2 by a known process, for example, by gluing on the top of the first transmission portion 21 .

Example 2

As shown in FIG2 , the shading layer 3 is disposed on the side surface of the first transmission portion 21 , and the upper bottom surface of the first transmission portion 21 is not provided with the shading layer 3 , so that light can be transmitted from the top of the first transmission portion 21 , that is, the upper bottom surface of the first transmission portion 21 .

In this embodiment, as shown in FIG2 , the hollow portion 22 is filled with a light-transmitting material. The light-transmitting material fills the hollow portion 22 and is flush with the first transmission portion 21. The light-transmitting material is solidified and formed in the hollow portion 22 to form a second transmission portion 4.

As shown in FIG. 2 , the light shielding layer 3 is distributed between the first transmission portion 21 and the second transmission portion 4 .

The refractive index of the second transmission part 4 is consistent with the refractive index of the first transmission part 21. In this embodiment, the light-transmitting material used in the second transmission part 4 is consistent with the material of the first transmission part 21, and both are transparent UV glue. During processing, the transparent UV glue can form the first transmission part 21 and the second transmission part 4 after being cured.

For this embodiment, as shown in FIG. 2 , the screen contents on one side of the substrate layer 1 can be viewed through both the first transmission portion 21 and the second transmission portion 4. Since the light shielding layer 3 is distributed between the first transmission portion 21 and the second transmission portion 4, the viewing angle of the screen contents on one side of the substrate layer 1 through the first transmission portion 21 and the second transmission portion 4 is limited; wherein the viewing angle of the substrate layer 1 viewed through the second transmission portion 4 is a third angle C, and the viewing angle of the substrate layer 1 viewed through the first transmission portion 21 is a fourth angle D; since in this embodiment, the refractive indexes of the first transmission portion 21 and the second transmission portion 4 are consistent, the third angle C and the fourth angle D should be set to be consistent, so that the same area of contents can be viewed when the screen is viewed through the first transmission portion 21 and the second transmission portion 4, thereby ensuring that the same visual effect can be generated when the screen is viewed through the first transmission portion 21 and the second transmission portion 4.

In addition, a functional layer 5 may be provided on the side of the transmissive layer 2 opposite to the substrate layer 1. The functional layer 5 is spaced parallel to the substrate layer 1, and sandwiches the transmissive layer 2 in the middle. The functional layer 5 may be provided according to the desired effect. For example, the functional layer 5 may be an anti-glare layer; for another example, the functional layer 5 may be used to enhance the overall hardness of the anti-peep film. For another example, the functional layer 5 may be a transparent substrate layer that is the same as the substrate layer 1. The functional layer 5 may enhance the film properties of the anti-peep film on the one hand, and protect the transmissive layer 2 on the other hand.

The functional layer 5 can be compounded on the first transmission portion of the transmission layer 2 and the top of the second transmission layer 2 by a known process, for example, by gluing on the surface of the transmission layer 2 .

Example 3

The basic structure of this embodiment is the same as that of Embodiment 2, except that, in this embodiment, the refractive index of the light-transmitting material filled in the hollow portion 22 is different from that of the first transmission portion 21, and therefore, the third angle C is different from the fourth angle D; the angle setting of the third angle C and the fourth angle D can be set according to the refractive indices of the first transmission portion 21 and the second transmission portion 4.

Thus, the privacy film of the present invention is formed. The privacy film of the present invention forms the light-shielding layer 3 by arranging a light-proof material on the first transmission part 21 of the transmission layer 2, rather than directly filling the light-proof material between two adjacent first transmission parts 21. Therefore, the volume ratio of the light-shielding layer 3 to the light-transmitting first transmission part 21 is greatly reduced, thereby increasing the transmittance of the privacy film and improving the overall brightness of the privacy film, thereby improving the display effect. The transmittance of the privacy film of the present invention is as high as 70% to 90%. It has the characteristics of high transmittance and simple structure. It has strong practicality and should be vigorously promoted.

The privacy film of the present invention can be prepared by the following steps:

S1. A transmission layer 2 is formed on a substrate layer 1 by UV coating process. The transmission layer 2 is formed with a plurality of parallel and spaced first transmission parts 21 , and hollow parts 22 are formed between the first transmission parts 21 .

S2. Apply an opaque material, such as black ink, on the surface of the first transmission portion 21, and then remove the opaque material on the bottom of the first transmission portion 21 by a known process such as grinding, scrubbing, or transfer, so that the light-shielding layer 3 is formed only on the two opposite sides of the first transmission portion 21.

For the structure of Example 1, after step S2, a functional layer 5 may be compounded on the top of the first transmission portion 21 by a known process.

For the structures of Embodiment 2 and Embodiment 3, after step S2, a fluid light-transmitting material is filled in the hollow portion 22 of the transmission layer 2, and then the light-transmitting material is cured to form the second transmission portion 4. The filled light-transmitting material may be a transparent UV glue, which can be cured into the second transmission portion 4 by ultraviolet irradiation; after the second transmission portion 4 is formed, a functional layer 5 can be compounded on the surfaces of the first transmission portion 21 and the second transmission portion 4 by a known process.

Although the present invention is disclosed through the above embodiments, the scope of the present invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the concept of the present invention.

Claims (10)

1. A privacy film, used to make screen information visible from the front and invisible from the side, characterized in that it comprises: A substrate layer (1) which is light-transmissive; A transmission layer (2) which is light-transmissive and is disposed on the substrate layer (1); the transmission layer (2) is provided with a plurality of rows of first transmission parts (21) which are arranged at intervals from each other, and hollow parts (22) are formed between the first transmission parts (21); A light shielding layer (3) which is opaque and is disposed on two opposite outer surfaces of the first transmission portion (21); The viewing angle of the substrate layer (1) viewed through the hollow portion (22) is a first angle A; The visible angle of the substrate layer (1) viewed through the first transmission portion (21) is a second angle B; The first angle A is greater than the second angle B, so that contents of the same area can be seen when the screen is viewed through the hollow portion (22) and the first transmission portion (21). 2. The privacy film according to claim 1, further comprising: The functional layer (5) is arranged on a side of the transmission layer (2) opposite to the substrate layer (1), and is parallel to and spaced from the substrate layer (1). 3. The anti-peep film according to claim 1, characterized in that a volume ratio of the light-shielding layer (3) to the first transmission portion (21) is less than or equal to 1:10. 4. The anti-peep film according to claim 1, characterized in that the thickness of the light-shielding layer (3) is less than 0.01 MM, the height of the first transmission portion (21) is less than 0.5 MM, and the width of the first transmission portion (21) is less than 0.1 MM. 5. The privacy film according to claim 1, characterized in that the light shielding layer (3) is formed by coating a light-proof material on two opposite side surfaces of the first transmission portion (21). 6. A privacy film, used to make screen information visible from the front and invisible from the side, characterized in that it comprises: A substrate layer (1) which is light-transmissive; A transmission layer (2) which is light-transmissive and is disposed on the substrate layer (1); the transmission layer (2) is provided with a plurality of rows of first transmission parts (21) which are arranged at intervals from each other, and hollow parts (22) are formed between the first transmission parts (21); A light shielding layer (3) which is opaque and is disposed on two opposite outer surfaces of the first transmission portion (21); The hollow portion (22) is filled with a light-transmitting material, the light-transmitting material forms a second transmission portion (4) in the hollow portion (22), and the light-shielding layer (3) is distributed between the first transmission portion (21) and the second transmission portion (4); The visible angle of the substrate layer (1) viewed through the second transmission portion (4) is a third angle C; The visible angle of the substrate layer (1) viewed through the first transmission portion (21) is a fourth angle D; The third angle C is consistent with or inconsistent with the fourth angle D; When viewing the screen through the first transmission portion (21) and the second transmission portion (4), content of the same area can be seen. 7. The privacy film according to claim 6, further comprising: The functional layer (5) is arranged on a side of the transmission layer (2) opposite to the substrate layer (1), and is parallel to and spaced from the substrate layer (1). 8. The anti-peep film according to claim 6, characterized in that a volume ratio of the light-shielding layer (3) to the first transmission portion (21) is less than or equal to 1:10. 9. The anti-peep film according to claim 6, characterized in that the thickness of the light-shielding layer (3) is less than 0.01 MM, the height of the first transmission portion (21) is less than 0.5 MM, and the width of the first transmission portion (21) is less than 0.1 MM. 10. The privacy film according to claim 6, characterized in that the light shielding layer (3) is formed by coating a light-proof material on two opposite side surfaces of the first transmission portion (21).