Backlight apparatus that can assure uniform brightness
US6685330B2 · kind B2 · utility
8Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 9, 2002 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Dec 9, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133615
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A backlight apparatus includes a point light source, a linear light guide, a plane light guide, and a light shield unit. Rays of light radiated by the point light source travel through the linear light guide and the plane light guide, and are output to an illuminated object. The light shield unit shuts out a leaking fraction of rays of light that travels directly from the point light source to the plane light guide, thereby assuring uniform brightness of the output light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.