Light emitting device packages using light scattering particles of different size
US11114594B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 24, 2007 |
| Grant date | Sep 7, 2021 |
| Priority date | — |
| Expiry date | Aug 24, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2991
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A radiation emitting device comprising light scattering particles of different sizes that at least partially surround an emitter, improving the spatial color mixing and color uniformity of the device. Multiple sizes of light scattering particles are dispersed in a medium to at least partially surround a single- or multiple-chip polychromatic emitter package. The different sizes of light scattering particles interact with corresponding wavelength ranges of emitted radiation. Thus, radiation emitted over multiple wavelength ranges or sub-ranges can be efficiently scattered to eliminate (or intentionally create) spatially non-uniform color patterns in the output beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.