Prism sheet with curved surface and liquid crystal display device using same

• US 20090033831A1
• Filed: 08/04/2008
• Published: 02/05/2009
• Est. Priority Date: 08/03/2007
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Innocom Technology Limited, Innolux Display Corporation (InnoLux Corporation)
• Inventors: Xu, Yi, Lin, Ching-Huang
• Granted Patent: US 8,558,969 B2
• Time in Patent Office: Days
• US Class Current: 349/64
• CPC Class Codes: G02B 5/0221 the surface having an irregular structure G02B5/0226 takes precedence
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide

Abstract

An exemplary prism sheet includes a base including an upper surface and a plurality of lenses disposed on the upper surface. The upper surface is a wavy surface. A liquid crystal display device using the prism sheet is also provided.

Claims

1. A prism sheet, comprising:

a base comprising an upper surface; and

a plurality of lenses disposed on the upper surface;

wherein the upper surface is a wavy surface.

2. The prism sheet of claim 1, wherein the upper surface is wavy along a first direction.

3. The prism sheet of claim 2, wherein the lenses form a serrated surface along the first direction.

4. The prism sheet of claim 3, wherein a distance defined between the centers of each pair of adjacent lenses is different.

5. The prism sheet of claim 3, wherein each lens is a long straight column having a triangular cross-section.

6. The prism sheet of claim 3, wherein the lenses have the same shape.

7. The prism sheet of claim 3, wherein the base further comprises a lower surface, the lower surface comprises a plurality of micro cavities.

8. The prism sheet of claim 7, wherein the micro cavities are uniformly distributed.

9. A liquid crystal display device, comprising:

a prism sheet comprising a base and a plurality of lenses, the base comprising an upper surface, the lenses are positioned on the upper surface;

wherein a distance defined between the centers of each pair of adjacent lenses is different.

10. The liquid crystal display device of claim 9, wherein the upper surface is wavy along a first direction.

11. The liquid crystal display device of claim 10, wherein the lenses form a serrated surface along the first direction.

12. The liquid crystal display device of claim 11, wherein each lens is a long straight column having a triangular cross-section.

13. The liquid crystal display device of claim 11, wherein the lenses have the same shape.

14. The liquid crystal display device of claim 11, wherein the base further comprises a lower surface, the lower surface comprises a plurality of micro cavities.

15. The liquid crystal display device of claim 14, wherein the micro cavities are uniformly distributed.