Patent ID: 6552495
Filing Date: 2003-04-22
Classification: F21V,H05B

Abstract:
A control system for generating a desired light color by a plurality of Red, Green and Blue light emitting diodes (LEDs) comprising:a sensor responsive to a light color generated by said plurality of LEDs to measure the color coordinates of said generated light, wherein said color coordinates are defined in a first color space; a first transformation module coupled to said sensor to transform said coordinates of said generated light to a second color space; a second transformation module configured to provide reference color coordinates corresponding to said desired light, wherein said reference color coordinates are expressed in said second color space; an adder coupled to said first and second transformation modules configured to generate an error color coordinate corresponding to a difference between said desired light color coordinates and said generated light color coordinates; and a driver module coupled to said adder and configured to generate a drive signal for driving said LEDs.