Prismatic film backlight
US8016475B2 · kind B2 · utility
196Cited by
5References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 10, 2007 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | May 17, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0046
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A selectively light-reflecting sheet (30) includes a prismatic film (1) with parallel prisms (10) on its face, a low-index film (3) on the prisms and a layer (5) on the low-index film, this layer having a substantially flat surface. This results in a low effective index, which means that light incident at steeper angles on the prismatic film (1) will pass through it. This “leaky” effect can be used in conjunction with a reflector sheet (20) in a tapered-waveguide arrangement to construct a lightweight backlight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.