Apparatus, method to enhance color contrast in phosphor-based solid state lights
US9312451B2 · kind B2 · utility
20Cited by
14References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 2012 |
| Grant date | Apr 12, 2016 |
| Priority date | — |
| Expiry date | May 14, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/289
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The efficiency and color contrast of a lighting device may be improved by using wavelength shifting material, such as a phosphor, to absorb less desired wavelengths and transmit more desired wavelengths. A double-notch reflective filter may pass desired wavelengths such as red and green, while returning or reflecting less desired wavelengths (blue and yellow) away from an optical exit back toward wavelength shifting material and re-emitted as light of more desirable wavelengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.