Color control method for LED lighting systems
US7719208B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2008 |
| Grant date | May 18, 2010 |
| Priority date | — |
| Expiry date | Jan 10, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
When temperature variation occurs to the LED dice of an LED lighting system, a feedback control mechanism is applied to compensate temperature-related wavelength shift for precisely controlling the light generated by the LED dice based on the voltage drop variation or current variation of the LED dice. The color control method for the LED lighting system includes a preliminary detection phase and a feedback control phase. In the preliminary detection phase, voltage drop signals or current signals together with corresponding color and hue signals of each LED module of the LED lighting system are detected. In the feedback control phase, signal compensating processes are performed to precisely control the light generated by the LED lighting system based on the voltage drop variation or the current variation in conjunction with the corresponding color and hue signals generated in the preliminary detection phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.