Gamut broadened displays with narrow band green phosphors
US10177287B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 2018 |
| Grant date | Jan 8, 2019 |
| Priority date | — |
| Expiry date | May 17, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0078
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Phosphors emitting green light over a narrow wavelength range may be used to broaden the gamut of display devices. In one aspect, a light emitting device comprises a light emitting solid state device emitting blue or violet light, a first phosphor that absorbs blue or violet light emitted by the light emitting solid state device and in response emits green light in a spectral band having a peak at wavelength λG and a height of one half its peak on a long wavelength edge of the band at wavelength λGhalf; and a second phosphor that absorbs blue or violet light emitted by the light emitting solid state device and in response emits red light in a spectral band having a peak at wavelength λR and a height of one half its peak on a short wavelength edge of the band at wavelength λRhalf. The ratio (λRhalf−λGhalf)/(λR−λG) is greater than 0.70.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.