Light source unit and display device having luminance control based upon detected light values
US7208713B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 2003 |
| Grant date | Apr 24, 2007 |
| Priority date | — |
| Expiry date | Jun 10, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133628
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light source unit includes a light source having LED chips for emitting different colors of light and an optical sensor for detecting light from a light mixer. A light source control section controls by feedback control luminance of each of the LED chips according to values detected by the optical sensor. The light source unit also includes a temperature control section for controlling the temperature of the light source. The temperature control section is a feedback control system. Keeping the light source at a constant temperature allows suppressing spectrum changes of the LED chips with temperature, thereby suppressing changes in the luminance and chromaticity of the light source unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.