Adaptive control system and method with spatial uniform color metric for RGB LED based white light illumination
First Claim
1. 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.
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Abstract
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.
269 Citations
14 Claims
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1. A control system for generating a desired light color by a plurality of Red, Green and Blue light emitting diodes (LEDs) comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method in a control system for generating a desired light by a plurality of Red, Green and Blue light emitting diodes (LEDs) comprising the steps of:
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sensing a light generated by said plurality of LEDs to measure the color coordinates of said light, wherein said color coordinates are defined in a first color space;
transforming said coordinates of said generated light to a second color space;
transforming reference color coordinates corresponding to said desired light, wherein said reference color coordinates are expressed in said second color space;
generating an error color coordinate corresponding to a difference between said desired light color coordinates and said generated light color coordinates; and
generating a drive signal for driving said LEDs. - View Dependent Claims (11, 12, 13, 14)
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Specification