Tunable white point light source using a wavelength converting element
US7902560B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 15, 2006 |
| Grant date | Mar 8, 2011 |
| Priority date | — |
| Expiry date | Sep 11, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/8513
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A uniform high brightness light source is provided using a plurality of light emitting diode (LED) chips with slightly different pump wavelengths with a wavelength converting element that includes at least two different wavelength converting materials that convert the light to different colors of light. The intensity of the light produced by the LED chips may be varied to provide a tunable CCT white point. The wavelength converting element may be, e.g., a stack or mixture of phosphor or luminescent ceramics. Moreover, the manufacturing process of the light source is simplified because the LED chips are all manufactured using the same technology eliminating the need to manufacture different types of chips.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.