Optical sheet, backlight and liquid crystal display apparatus
US7483094B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2005 |
| Grant date | Jan 27, 2009 |
| 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 hyperboloidal face or a paraboloidal face and have a finite focal distance on the emission side of illumination light. 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 satisfies Z=X2/(R+√{square root over ( )}(R2−(1+K)X2)) (where R is the radius of curvature of a distal end vertex, and K is a conic constant).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.