Direct-illumination backlight apparatus having transparent plate acting as light guide plate
US7273291B2 · kind B2 · utility
18Cited by
2References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 2005 |
| Grant date | Sep 25, 2007 |
| Priority date | — |
| Expiry date | Jun 4, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133603
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A direct-illumination backlight apparatus using LEDs includes a flat reflective plate, an LED light source, a transparent plate, a scattering pattern, and a light guide. The light guide serves to introduce a partial light from an LED light source at such an angle that the partial light is trapped inside the transparent plate, and the scattering pattern serves to scatter the trapped light beam at a position directly above the LED light source so that the scattered light beam escapes out of the transparent plate toward an LCD panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.