Method of calibrating monochromatic light beams outputted by light emitting diodes and related light emitting diode control system
US7638956B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 10, 2007 |
| Grant date | Dec 29, 2009 |
| Priority date | — |
| Expiry date | Jul 31, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2001/4252
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To control chroma and brightness in a backlight module, a plurality of reference values of a plurality of monochromatic light beams are provided, and a brightness reference value is provided for the light formed of the monochromatic light beams. Then, a plurality of first light signals of the monochromatic light beams, and a second light signal of the light formed of the monochromatic light beams are sensed and compared with the reference values and the brightness reference value, respectively. Finally, the monochromatic light beams outputted by the plurality of LEDs is calibrated according to a comparison result of the plurality of first light signals with the plurality of reference values and a comparison result of the second light signal with the brightness reference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.