Color shifting pumped-phosphor light emitting diode light sources via modulation of current pulses
US8981665B1 · kind B1 · utility
2Cited by
1References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2011 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Nov 5, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B45/24
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light source can include an LED configured to emit light having a spectrum of first wavelengths when provided with electrical current, a pumped material configured to absorb at least some of the light emitted by the LED and to emit light having a spectrum of second wavelengths, a power supply configured to provide a series of electrical current pulses to the LED, and a current controller configured to control a time-averaged chromaticity coordinate of a combination of light emitted from the LED and the pumped material by controlling the series of current pulses provided to the LED.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.