The systems and methods described herein relate to LED systems capable of generating light, such as for illumination or display purposes. The light-emitting LEDs may be controlled by a processor to alter the brightness and/or color of the generated light, e.g., by using pulse-width modulated signals....http://www.google.co.uk/patents/US6150774?utm_source=gb-gplus-sharePatent US6150774 - Multicolored LED lighting method and apparatus
