Adaptive control system and method with spatial uniform color metric for RGB LED based white light illumination
The present invention is directed to a control system for generating a desired light color by a plurality of Red, Green and Blue light emitting diodes (LEDs) comprised of a sensor responsive to a light color generated by the plurality of LEDs to measure the color coordinates of the generated light where the color coordinates are defined in a first color space. A first transformation module is provided, coupled to the sensor to transform the coordinates of the generated light to a second color space. A second transformation module is configured to provide reference color coordinates corresponding to the desired light, where the reference color coordinates are expressed in the second color space. An adder is provided, coupled to the transformation module and the reference module configured to generate an error color coordinate corresponding to a difference between the desired light color coordinates and the generated light color coordinates. A driver module is coupled to the adder and configured to generate a drive signal for driving the LEDs.
Koninklijke Philips Electronics N.V.
F H F H
F21V H05B F21V H05B
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Chin
Chang