Back-light device for liquid crystal display
US6406159B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 4, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Jan 4, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0055
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A back-light device for a liquid crystal display in which chromaticity can be corrected without impairing the brightness of a liquid crystal display panel and in which the occurrence of bright lines can be effectively prevented. In the back-light device for the liquid crystal display provided with a reflection sheet on one side of a light guiding plate and a diffusion sheet on the other side of the same and a light source composed of a cathode tube on the side, a chromaticity correcting film is mounted to the end, positioned nearer to the cathode tube, of the reflection sheet and light partially reflected off the upper surface of the light guiding plate is reflected off the reflection sheet and returns to the light guiding plate. By repeated reflection of light between the light guiding plate and the reflection sheet, the corrected light is spread uniformly over the whole of the light guiding plate, thus promoting the correction of chromaticity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.