Controlling method and system for LED-based backlighting source

Details Controlling method and system for LED-based backlighting source Controlling method and system for LED-based backlighting source

2008-01-08

2008-01-08

Vu, David H. (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S312000, C315S307000

Reexamination Certificate

active

11219284

ABSTRACT:
The present invention uses different frequencies to drive the LED strips in the back-lighting source so that the spatial uniformity of the back-lighting source as well as the color levels in the source can be monitored and adjusted. Each individual strip is assigned to a different frequency. Alternatively, the strips are divided into groups and each group is assigned to a different frequency. A group may comprise two or more strips. Furthermore, some groups may have more strips than the other groups and the number of LEDs in one strip may be different from the number in other strips. The brightness uniformity and the color levels in the back-lighting source are sensed by one or more groups of color sensors in R, G and B. The assignment of driving frequencies can be based on the location of the strips.

REFERENCES:
patent: 6507159 (2003-01-01), Muthu
patent: 6963175 (2005-11-01), Archenhold et al.
patent: 2003/0001832 (2003-01-01), Chang
patent: 2003/0076056 (2003-04-01), Schuurmans
patent: 2003/0230991 (2003-12-01), Muthu et al.
patent: 383122 (2000-02-01), None
patent: WO 2004/057923 (2004-07-01), None

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