Color shift sign
US9404637B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2012 |
| Grant date | Aug 2, 2016 |
| Priority date | — |
| Expiry date | Dec 7, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10K59/875
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present application is directed to an illumination device comprising a recycling cavity defined by recycling surfaces and a light emission surface; a light source within the cavity. A spectrum modifying layer is on a portion of the recycling surface, the spectrum modifying layer producing a spectral response different from the spectral response of the recycling surface. In some embodiments, the spectrum modifying layer shifts the spectral properties of the light being emitted from the light emission area from the spectral properties of the light source. In some embodiments, the spectrum modifying layer selectively absorbs a portion of light along the light source spectrum. In some embodiments, the spectrum modifying layer re-emits light at a wavelength longer than the wavelength it absorbed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.