A circuit is provided to drive LEDs or diode lasers that emit light in desired wavelengths, such as the primary colors red, green, and blue, which serve as the light source for a projection display system. A display controller controls one or more series-parallel arrays of each color LED in the LED circuit...http://www.google.es/patents/US7088321?utm_source=gb-gplus-sharePatente US7088321 - Method and apparatus for driving LED light sources for a projection display
Method and apparatus for driving LED light sources for a projection display
