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1. US20210223609 - ANTI-PEEP FILM AND MANUFACTURING METHOD THEREOF, AND DISPLAY MODULE

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[ EN ]

Claims

1. An anti-peep film, comprising a plurality of transmission areas and a plurality of anti-peep areas, wherein the plurality of transmission areas and the plurality of anti-peep areas are alternately arranged in a direction perpendicular to a thickness direction of the anti-peep film;
wherein at least one anti-peep area of the plurality of anti-peep areas has a set structure, and the set structure enables that light incident on the at least one anti-peep area from a first side in the thickness direction of the anti-peep film is reflected back to the first side through the at least one anti-peep area.
2. The anti-peep film of claim 1, wherein the set structure comprises a plurality of prisms, and the plurality of prisms are arranged along the thickness direction of the anti-peep film.
3. The anti-peep film of claim 2, wherein at least one prism of the plurality of prisms is a quadrangular prism or a pentagonal prism.
4. The anti-peep film of claim 3, wherein a refractive index of at least one transmission area of the plurality of transmission areas is smaller than a refractive index of the at least one prism.
5. The anti-peep film of claim 4, wherein the at least one prism comprises an incident surface, a first total reflection surface, a second total reflection surface, and an emission surface;
wherein specific light incident on the at least one prism from the first side is able to be reflected back to the first side after transmitting through the incident surface, being totally reflected by the first and second total reflection surfaces, and transmitting through the emission surface; and an angle between the specific light and a horizontal direction satisfies a preset angle range.
6. The anti-peep film of claim 5, wherein the first and second total reflection surfaces are arranged in a mirror image with respect to a plane parallel to the thickness direction of the anti-peep film and perpendicular to an arrangement direction of the plurality of anti-peep areas, and the incident and emission surfaces are arranged in a mirror image with respect to the plane parallel to the thickness direction of the anti-peep film and perpendicular to the arrangement direction of the plurality of anti-peep areas.
7. The anti-peep film of claim 5, wherein along the thickness direction of the anti-peep film and away from the first side, angles between respective pairs of first and second total reflection surfaces of the plurality of prisms decrease, and angles between respective pairs of incident and emission surfaces of the plurality of prisms increase.
8. The anti-peep film of claim 5, wherein when the at least one prism is the pentagonal prism, the pentagonal prism further comprises a bottom surface.
9. The anti-peep film of claim 4, wherein the set structure further comprises an anti-peep layer, which surrounds the plurality of prisms, and a refractive index of the anti-peep layer is smaller than the refractive index of the at least one prism.
10. The anti-peep film of claim 9, wherein the refractive index of the anti-peep layer is equal to the refractive index of the at least one transmission area.
11. The anti-peep film of claim 1, further comprises a top substrate and a bottom substrate, and the plurality of transmission areas and the plurality of anti-peep areas are alternately arranged between the upper and bottom substrates in the direction perpendicular to the thickness direction of the anti-peep film.
12. A display module, comprising a display panel, a backlight module and the anti-peep film of claim 1.
13. The display module of claim 12, wherein the anti-peep film is provided on a light emission side of the display panel; and/or the anti-peep film is provided on a side of the display panel close to the backlight module.
14. A manufacturing method of the anti-peep film of claim 1, comprising:
forming a plurality of prism groups spaced apart; wherein at least one prism group of the plurality of prism groups comprises a plurality of prisms arranged in the thickness direction of the anti-peep film; and
instilling optical glue between two adjacent prism groups of the plurality of prism groups, and curing the optical glue.
15. The manufacturing method of claim 14, wherein forming the plurality of prism groups spaced apart comprises:
forming an optical layer with a set thickness; and
engraving the optical layer using laser to form the plurality of prism groups; wherein the at least one prism group comprises a plurality of quadrangular prisms and/or pentagonal prisms arranged along the thickness direction of the anti-peep film.
16. The manufacturing method of claim 14, wherein forming the plurality of prism groups spaced apart comprises:
forming an optical layer with a set thickness; and
engraving the optical layer using a cutter to form the plurality of prism groups; wherein the at least one prism group comprises a plurality of quadrangular prisms and/or pentagonal prisms arranged along the thickness direction of the anti-peep film.
17. The manufacturing method of claim 14, wherein forming the plurality of prism groups spaced apart comprises:
printing a plurality of quadrangular prisms and/or pentagonal prisms arranged along the thickness direction of the anti-peep film by layer, to form the at least one prism group, using a 3D printing method.
18. The manufacturing method of claim 14, wherein instilling the optical glue between the two adjacent prism groups, and curing the optical glue comprises:
injecting photocurable glue between the two adjacent prism groups; and
irradiating the photocurable glue with ultraviolet light;
wherein a refractive index of the photocurable glue is smaller than a refractive index of the at least one prism group.
19. The anti-peep film of claim 6, wherein along the thickness direction of the anti-peep film and away from the first side, angles between respective pairs of first and second total reflection surfaces of the plurality of prisms decrease, and angles between respective pairs of incident and emission surfaces of the plurality of prisms increase.
20. The anti-peep film of claim 19, wherein the set structure further comprises an anti-peep layer, which surrounds the plurality of prisms, and a refractive index of the anti-peep layer is smaller than the refractive index of the at least one prism.