Optical film

Abstract

The utility model discloses an optical film which comprises a peep-proof layer and a base material layer connected with the peep-proof layer, the peep-proof layer comprises light-transmitting units and light-absorbing units which are alternately arranged in the horizontal direction, and each light-absorbing unit is of a stepped structure and at least comprises a first trapezoidal part and a second trapezoidal part. The first trapezoidal part is provided with a first upper bottom surface and a first lower bottom surface, the first upper bottom surface is connected with the base material layer, and the area of the first upper bottom surface is smaller than that of the first lower bottom surface; the area of the second upper bottom surface is smaller than that of the second lower bottom surface and larger than that of the first lower bottom surface, and the light transmitting units are filled between the adjacent light absorbing units. According to the utility model, the light absorption units are arranged in a stepped structure, so that the proportion of the light absorption units in the unit area of the peep-proof layer is effectively reduced, and the proportion of the light transmission units is improved, thereby improving the brightness, facilitating the enhancement of light received by a fingerprint module and the like, and enabling the fingerprint module and the like to work smoothly.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-peeping display, in particular to an optical film. Background Art

[0002] As people pay more attention to privacy, various anti-peep film products have appeared on the market. However, the existing anti-peep film has the following problems: 1. The thickness of the anti-peep film is too thick, and consumers have a bad user experience; 2. In the application of OLED curved mobile phones, the anti-peep film is also required to fit the curved surface, which requires the glass on the anti-peep film to be designed with a curved surface, which increases the difficulty and cost; 3. OLED curved mobile phones are often used in under-screen fingerprint recognition solutions. Due to the low transmittance of conventional anti-peep films, the under-screen fingerprint cannot be successfully recorded or unlocked. Summary of the invention

[0003] The utility model aims to provide an optical film to solve the problem of low light transmittance of the existing optical films.

[0004] In order to achieve the above-mentioned purpose, the utility model provides an optical film, including an anti-peep layer and a substrate layer connected to the anti-peep layer, the anti-peep layer including light-transmitting units and light-absorbing units alternately arranged in a horizontal direction, the light-absorbing units presenting a stepped structure and including at least a first trapezoidal portion and a second trapezoidal portion, the first trapezoidal portion having a first upper bottom surface and a first lower bottom surface, the first upper bottom surface being connected to the substrate layer and the area of ​​the first upper bottom surface being smaller than the area of ​​the first lower bottom surface, the second trapezoidal portion having a second upper bottom surface and a second lower bottom surface, the area of ​​the second upper bottom surface being smaller than the area of ​​the second lower bottom surface and the area of ​​the second upper bottom surface being larger than the area of ​​the first lower bottom surface, the light-transmitting units are filled between adjacent light-absorbing units.

[0005] Preferably, the optical film further comprises a film layer, an adhesive layer and a surface protection layer, wherein the film layer, the adhesive layer, the anti-peep layer, the substrate layer and the surface protection layer are arranged in sequence from bottom to top, and the second bottom surface is connected to the adhesive layer.

[0006] Preferably, the first lower bottom surface of the first trapezoidal portion is connected to the second upper bottom surface of the second trapezoidal portion.

[0007] Preferably, at least one intermediate trapezoidal portion is provided between the first lower bottom surface of the first trapezoidal portion and the second upper bottom surface of the second trapezoidal portion.

[0008] Preferably, the inclination angle of the side of the first trapezoidal portion relative to the vertical direction is a first inclination angle, and the inclination angle of the side of the second trapezoidal portion relative to the vertical direction is a second inclination angle, the first inclination angle is greater than or equal to 0.5 degrees and less than or equal to 10 degrees, and the second inclination angle is greater than or equal to 0.5 degrees and less than or equal to 10 degrees.

[0009] Preferably, the first lower bottom surface has a first length in the extension direction of each of the light absorbing units and a first width corresponding to the first length, the second lower bottom surface has a second length in the extension direction of each of the light absorbing units and a second width corresponding to the second length, the first width is smaller than the second width, the value of the first width is greater than or equal to 2 microns and less than or equal to 30 microns, and the value of the second width is greater than or equal to 5 microns and less than or equal to 50 microns.

[0010] Preferably, the thickness of the anti-peep layer is greater than or equal to 25 microns and less than or equal to 150 microns.

[0011] Preferably, the material of the substrate layer is selected from at least one of PET, PVC, PC, PI, and TPU, and the thickness of the substrate layer is greater than or equal to 6 microns and less than or equal to 100 microns.

[0012] Preferably, the adhesive layer is selected from at least one of silicone glue, acrylic glue, PU glue, and silicone rubber, and the thickness of the adhesive layer is greater than or equal to 5 microns and less than or equal to 50 microns.

[0013] Preferably, the thickness of the film layer is greater than or equal to 25 micrometers and less than or equal to 250 micrometers.

[0014] Compared with the prior art, the utility model arranges the light absorbing units in a stepped structure, thereby effectively reducing the proportion of light absorbing units in a unit area of ​​the anti-peeping layer while ensuring the anti-peeping effect, and increasing the proportion of light transmitting units, thereby increasing the brightness, making it easier for the fingerprint module, etc. to receive stronger light, so that it can work smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the optical film according to the embodiment of the utility model, showing a schematic diagram of the structure of the anti-peep layer.

[0016] Figure 2 It is a structural schematic diagram of the light absorption unit of an embodiment of the utility model.

[0017] Figure 3 Another structural schematic diagram of the anti-peep layer of an embodiment of the utility model.

[0018] Figure 4This is another structural schematic diagram of the anti-peep layer of an embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to explain the technical content, structural features and achieved effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0020] like Figures 1 to 4 As shown, an embodiment of the utility model provides an optical film, including an anti-peeping layer 3 and a substrate layer 4 connected to the anti-peeping layer 3, the anti-peeping layer 3 includes light-transmitting units 32 and light-absorbing units 31 alternately arranged in a horizontal direction, the light-absorbing units 31 are in a stepped structure and at least include a first trapezoidal portion 311 and a second trapezoidal portion 312, the first trapezoidal portion 311 has a first upper bottom surface 3111 and a first lower bottom surface 3112, the first upper bottom surface 3111 is connected to the substrate layer 4 and the area of ​​the first upper bottom surface 3111 is smaller than the area of ​​the first lower bottom surface 3112, the second trapezoidal portion 312 has a second upper bottom surface 3121 and a second lower bottom surface 3122, the area of ​​the second upper bottom surface 3121 is smaller than the area of ​​the second lower bottom surface 3122 and the area of ​​the second upper bottom surface 3121 is larger than the area of ​​the first lower bottom surface 3112, and the light-transmitting units 32 are filled between adjacent light-absorbing units 31. Specifically, the light absorbing unit 31 is a black light absorbing structure, and may include acrylic resin and light absorbing material, and the light absorbing material is selected from one or a combination of at least two of carbon black, black essence, silver black essence, and silver gray essence, and the light transmitting unit 32 is a transparent structure, and the light transmitting unit 32 may include acrylic resin. The light absorbing unit 31 is arranged in a stepped structure, which effectively reduces the proportion of the light absorbing unit 31 per unit area of ​​the anti-peeping layer 3 while ensuring the anti-peeping effect, and increases the proportion of the light transmitting unit 32, thereby increasing the brightness, making it easier for the fingerprint module and the like to receive stronger light, so that it can work smoothly.

[0021] In the embodiment of the utility model, Figure 1 to Figure 2 As shown, the optical film also includes a film layer 1, an adhesive layer 2 and a surface protection layer 5. The film layer 1, the adhesive layer 2, the anti-peep layer 3, the substrate layer 4 and the surface protection layer 5 are arranged in sequence from bottom to top, and the second bottom surface 3122 is connected to the adhesive layer 2. The embodiment of the utility model can directly set the surface protection layer 5 on the upper surface of the substrate layer 4, which is more convenient to set and the process is simpler. In addition, the present embodiment removes the glass layer and the OCA adhesive layer in the existing anti-peep film, which reduces the thickness and is convenient for consumers to use. At the same time, it also reduces the optical path loss and is more convenient for fingerprint unlocking. Moreover, due to the curved surface design of OLED mobile phones, the laminated glass must also be curved, which is costly. The utility model directly removes the glass layer in the existing anti-peep film, which is conducive to reducing costs.

[0022] In the embodiment of the utility model, the first lower bottom surface 3112 of the first trapezoidal portion 311 is connected to the second upper bottom surface 3121 of the second trapezoidal portion 312. Figure 2 As shown, the light absorbing unit 31 is formed by a first trapezoidal portion 311 and a second trapezoidal portion 312. In some other specific embodiments, at least one intermediate trapezoidal portion is further provided between the first lower bottom surface 3112 of the first trapezoidal portion 311 and the second upper bottom surface 3121 of the second trapezoidal portion 312. Figure 3 As shown, a first intermediate trapezoidal portion 313 is further provided between the first lower bottom surface 3112 of the first trapezoidal portion 311 and the second upper bottom surface 3121 of the second trapezoidal portion 312; Figure 4 As shown, a second intermediate trapezoidal portion 314 and a third intermediate trapezoidal portion 315 are further provided between the first lower bottom surface 3112 of the first trapezoidal portion 311 and the second upper bottom surface 3121 of the second trapezoidal portion 312. The second intermediate trapezoidal portion 314 is provided above the third intermediate trapezoidal portion 315. It should be noted that the number of intermediate trapezoidal portions can be determined according to actual needs. The provision of multiple trapezoidal portions can flexibly adjust the area of ​​the light absorption unit 31, and the design flexibility is higher.

[0023] In the embodiment of the utility model, Figure 2 As shown, the inclination angle of the side of the first trapezoidal portion 311 relative to the vertical direction is the first inclination angle a1, and the inclination angle of the side of the second trapezoidal portion 312 relative to the vertical direction is the second inclination angle a2, the first inclination angle a1 is greater than or equal to 0.5 degrees and less than or equal to 10 degrees, and the second inclination angle a2 is greater than or equal to 0.5 degrees and less than or equal to 10 degrees. The setting of the first inclination angle a1 and the second inclination angle a2 effectively ensures the anti-peeping performance of the anti-peeping layer 3.

[0024] In the embodiment of the utility model, Figure 2 As shown, the first trapezoidal portion 311 has a first height h1, the second trapezoidal portion 312 has a second height h2, and the ratio of the second height h2 to the first height h1 is greater than or equal to 0.1 and less than or equal to 10. By setting the ratio of the second height h2 to the first height h1, both the anti-peeping property and the light transmittance are taken into consideration, and the design is ingenious.

[0025] In the embodiment of the utility model, Figure 2As shown, the first lower bottom surface 3112 has a first length in the extension direction of each light absorbing unit 31 and a first width w1 corresponding to the first length, the second lower bottom surface 3122 has a second length in the extension direction of each light absorbing unit 31 and a second width w2 corresponding to the second length, the first width w1 is smaller than the second width w2, the value of the first width w1 is greater than or equal to 2 microns and less than or equal to 30 microns, the value of the second width w2 is greater than or equal to 5 microns and less than or equal to 50 microns, and the thickness of the anti-peep layer 3 is greater than or equal to 25 microns and less than or equal to 150 microns.

[0026] In the embodiment of the utility model, the material of the substrate layer 4 is selected from at least one of PET (polyethylene terephthalate), PVC (polyvinyl chloride), PC (polycarbonate), PI (polyimide), and TPU (thermoplastic polyurethane rubber). The thickness of the substrate layer 4 is greater than or equal to 6 microns and less than or equal to 100 microns. The surface protection layer 5 is formed by coating and UV curing unsaturated acrylic acid.

[0027] In the embodiment of the utility model, the adhesive layer 2 is selected from at least one of silicone glue, acrylic glue, PU glue, and silicone rubber, and the thickness of the adhesive layer 2 is greater than or equal to 5 microns and less than or equal to 50 microns.

[0028] In the embodiment of the utility model, the film layer 1 is specifically a release film, and the thickness of the film layer 1 is greater than or equal to 25 micrometers and less than or equal to 250 micrometers.

[0029] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. An optical film, characterized in that: The invention comprises an anti-peeping layer and a base material layer connected to the anti-peeping layer, wherein the anti-peeping layer comprises light-transmitting units and light-absorbing units alternately arranged in a horizontal direction, wherein the light-absorbing units are in a stepped structure and comprise at least a first trapezoidal portion and a second trapezoidal portion, wherein the first trapezoidal portion comprises a first upper bottom surface and a first lower bottom surface, wherein the first upper bottom surface is connected to the base material layer and an area of ​​the first upper bottom surface is smaller than an area of ​​the first lower bottom surface, wherein the second trapezoidal portion comprises a second upper bottom surface and a second lower bottom surface, wherein an area of ​​the second upper bottom surface is smaller than an area of ​​the second lower bottom surface and an area of ​​the second upper bottom surface is larger than an area of ​​the first lower bottom surface, and wherein the light-transmitting units are filled between adjacent light-absorbing units.

2. The optical film according to claim 1, wherein The optical film further comprises a film layer, an adhesive layer and a surface protection layer, wherein the film layer, the adhesive layer, the anti-peep layer, the substrate layer and the surface protection layer are arranged in sequence from bottom to top, and the second bottom surface is connected to the adhesive layer.

3. The optical film according to claim 1, wherein The first lower bottom surface of the first trapezoidal portion is connected to the second upper bottom surface of the second trapezoidal portion.

4. The optical film according to claim 1, wherein At least one intermediate trapezoidal portion is provided between the first lower bottom surface of the first trapezoidal portion and the second upper bottom surface of the second trapezoidal portion.

5. The optical film according to claim 1, wherein: The inclination angle of the side of the first trapezoidal portion relative to the vertical direction is a first inclination angle, and the inclination angle of the side of the second trapezoidal portion relative to the vertical direction is a second inclination angle. The first inclination angle is greater than or equal to 0.5 degrees and less than or equal to 10 degrees, and the second inclination angle is greater than or equal to 0.5 degrees and less than or equal to 10 degrees.

6. The optical film according to claim 1, wherein: The first lower bottom surface has a first length in the extension direction of each of the light absorbing units and a first width corresponding to the first length, the second lower bottom surface has a second length in the extension direction of each of the light absorbing units and a second width corresponding to the second length, the first width is smaller than the second width, the value of the first width is greater than or equal to 2 microns and less than or equal to 30 microns, and the value of the second width is greater than or equal to 5 microns and less than or equal to 50 microns.

7. The optical film according to claim 1, wherein: The thickness of the privacy protection layer is greater than or equal to 25 micrometers and less than or equal to 150 micrometers.

8. The optical film according to claim 1, wherein: The material of the substrate layer is selected from at least one of PET, PVC, PC, PI, and TPU, and the thickness of the substrate layer is greater than or equal to 6 microns and less than or equal to 100 microns.

9. The optical film according to claim 2, wherein: The adhesive layer is selected from at least one of silicone glue, acrylic glue, PU glue, and silicone rubber, and the thickness of the adhesive layer is greater than or equal to 5 microns and less than or equal to 50 microns.

10. The optical film according to claim 2, wherein: The thickness of the film layer is greater than or equal to 25 micrometers and less than or equal to 250 micrometers.

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