Prism sheet and display device

• US 8,964,318 B2
• Filed: 07/20/2012
• Issued: 02/24/2015
• Est. Priority Date: 07/28/2011
• Status: Expired due to Fees

• Current Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Bejing BOE Display Technology Company Limited, BOE Technology Group Co., Ltd.
• Inventors: Zhang, Minghui, Sun, Ning, Jia, Zhishuai, Liu, Jie, Ma, Yihong
• Primary Examiner(s): Chwasz, Jade R
• Application Number:
  US13/701,644
• Publication Number:
  US 20130222931A1
• Time in Patent Office: 949 Days
• Field of Search: None
• US Class Current: 359/837
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0268 characterized by the fabrication or manufacturing method
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 5/04 Prisms

Abstract

The present invention discloses a prism sheet and a display device comprising the prism sheet for improving performances of a backlight module in a liquid crystal display device. The prism sheet comprises a first substrate and a second substrate, wherein the first substrate comprises a first surface and a second surface opposite to the first surface, and the second surface comprises a plurality of first protrusions arranged in parallel along a first direction; the second substrate comprises a third surface and a fourth surface opposite to the third surface, the third surface comprises a plurality of second protrusions arranged in parallel along the first direction, and the fourth surface comprises a plurality of third protrusions arranged in parallel along a second direction; and the second surface and the third surface are joined by meshing of the first protrusions with the second protrusions.

Claims

1. A prism sheet comprising:

a first substrate and a second substrate,

wherein the first substrate comprises a first surface and a second surface opposite to the first surface, and the second surface comprises a plurality of first protrusions arranged in parallel along a first direction;

the second substrate comprises a third surface and a fourth surface opposite to the third surface, the third surface comprises a plurality of second protrusions arranged in parallel along the first direction, and the fourth surface comprises a plurality of third protrusions arranged in parallel along a second direction;

the second surface and the third surface are joined by meshing of the first protrusions with the second protrusions, and

the third surface and the fourth surface are parallel to each other, and the first direction and the second direction are parallel to the plane of the third and the fourth surfaces and are different from each other.

2. The prism sheet according to claim 1, wherein a refractive index of the first substrate is larger than that of the second substrate.

3. The prism sheet according to claim 2, wherein a material of the first substrate or the second substrate comprises at least one selected from the group consisted of Poly(methylmethacrylate), Polycarbonate, Polystyrene, and Styrene-Methyl Methacrylate Copolymer.

4. The prism sheet according to claim 3, wherein the second substrate is formed by extruding the third surface extruded with a roller having hob teeth along the first direction and extruding the fourth surface extruded with a roller with hob teeth along the second direction.

5. The prism sheet according to claim 1, wherein the first direction and the second direction forms an angle that is greater than 0°

and less than 180°

.

6. The prism sheet according to claim 1, wherein the axial cross-sections of the first protrusions, the second protrusions, and the third protrusions are polygons.

7. The prism sheet according to claim 6, wherein the vertex angles of the polygon are rounded corners.

8. The prism sheet according to claim 7, wherein a shape of the first protrusions is the same as that of the second protrusions.

9. The prism sheet according to claim 6, wherein a shape of the first protrusions is the same as that of the second protrusions.

10. The prism sheet according to claim 1, wherein the first surface comprises one selected from the group consisted of planar surface and curved surface.

11. The prism sheet according to claim 1, wherein a material of the first substrate or the second substrate comprises at least one selected from the group consisted of Poly(methylmethacrylate), Polycarbonate, Polystyrene, and Styrene-Methyl Methacrylate Copolymer.

12. The prism sheet according to claim 11, wherein the second substrate is formed by extruding the third surface extruded with a roller having hob teeth along the first direction and extruding the fourth surface extruded with a roller with hob teeth along the second direction.

13. A display device, comprising a prism sheet, which comprises a first substrate and a second substrate,

wherein the first substrate comprises a first surface and a second surface opposite to the first surface, and the second surface comprises a plurality of first protrusions arranged in parallel along a first direction;

the second substrate comprises a third surface and a fourth surface opposite to the third surface, the third surface comprises a plurality of second protrusions arranged in parallel along the first direction, and the fourth surface comprises a plurality of third protrusions arranged in parallel along a second direction;

the second surface and the third surface are joined by meshing of the first protrusions with the second protrusions, and

the third surface and the fourth surface are parallel to each other, and the first direction and the second direction are directions that are parallel to the plane of the third and the fourth surfaces and are different from each other.

14. The display device according to claim 13, wherein a refractive index of the first substrate is larger than that of the second substrate.

15. The display device according to claim 13, wherein the first direction and the second direction forms an angle that is greater than 0°

and less than 180 °

.

16. The display device according to claim 13, wherein the axial cross-sections of the first protrusions, the second protrusions, and the third protrusions are polygons.

17. The display device according to claim 16, wherein the vertex angles of the polygon are rounded corners.

18. The display device according to claim 16, wherein a shape of the first protrusions is the same as that of the second protrusions.

19. The display device according to claim 13, wherein the first surface comprises one selected from the group consisted of planar surface and curved surface.

20. The display device according to claim 13, wherein a material of the first substrate or the second substrate comprises at least one selected from the group consisted of Poly(methylmethacrylate), Polycarbonate, Polystyrene, and Styrene-Methyl Methacrylate Copolymer.