Diffused light controlling optical sheet, back light device and liquid crystal display apparatus
US6417831B2 · kind B2 · utility
27Cited by
9References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1998 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Mar 5, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133606
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A diffused light controlling optical sheet to be used in a back light device of a liquid crystal display apparatus, wherein convex parts are provided at the opposite side to its light receiving surface and a tangential line on a side face of the convex part makes an angle of 60 to 90 degrees with the light receiving surface, and a fine material which is slightly different in refractive index from a material forming the sheet is contained inside the convex parts and thereby a diffused light inputted through the light receiving surface is converted to a diffused light of intense directivity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.