Method and apparatus for measuring spectral content of LED light source and control thereof
US6448550B1 · kind B1 · utility
245Cited by
2References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 27, 2000 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Apr 27, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Solid state illumination using closed loop spectral control. Light emitting diodes producing different colors are mounted in close proximity to photosensors. Spectral content of the light emitting diodes is measured by the photosensors, and these measurements used to adjust light emitting diode currents to achieve the desired spectral characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.