Optical sheet, backlight and liquid crystal display apparatus
US7695167B2 · kind B2 · utility
0Cited by
3References
17Claims
0Family size
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Key dates
| Filing date | Sep 30, 2005 |
| Grant date | Apr 13, 2010 |
| Priority date | — |
| Expiry date | Sep 30, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical sheet has a large number of cylindrical lens elements provided successively on one of principal faces thereof. The cylindrical lens elements have a finite focal distance on the emission side of illumination light and have an aspheric face of a leftwardly and rightwardly symmetric sectional shape. Where a Z axis is taken in parallel to a normal line direction to the optical sheet and an X axis is taken in a direction of the row of the cylindrical lens elements, a cross sectional shape of the cylindrical lens elements satisfiesZ=X2/(R+√{square root over ( )}(R2−(1+K)X2))+AX4+BX5+CX6+ . . .
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.