Direct-type backlight device
US7726826B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2005 |
| Grant date | Jun 1, 2010 |
| Priority date | — |
| Expiry date | May 10, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A thin direct-type backlight capable of realizing high brightness uniformity is provided by a specific configuration of the direct-type backlight whereby high light beam utilization ratio is maintained while periodical unevenness of the light emitting surface is suppressed. In a direct-type backlight device having a plurality of linear light sources in parallel, a reflection plate and a light diffusion plate, at least one of main surfaces of the light diffusion plate is provided with a prismatic ridges having a sawtooth-shaped cross-section. The apex angle “y” (degree) of the prismatic ridge of the light diffusion plate, the distance “a” (mm) between centers of the adjacent linear light sources, and the distance “b” (mm) from a center of the linear light sources to a surface of the light diffusion plate facing the light source satisfy the relationship of 80×(b/a)+15<y<180×(b/a)+70.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.