Surface light source device and liquid crystal display device using it
US6805468B2 · kind B2 · utility
41Cited by
2References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2002 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Oct 17, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/80
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A prism member is interposed between an LED board and a light incidence surface of a light guide plate. The prism member includes a prism sheet consisting of minute prisms that are arranged along the LED board and that have a function of refracting light that is emitted from each LED and thereby inputting, to the light incidence surface, refracted light that is scattered to both sides in the longitudinal direction of the light incidence surface. As a result, chrominance or luminance unevenness can be prevented even if the distance between the LED board and the light incidence surface is short.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.