Patent ID: 8324830

Claim:
A color control system for a backlight utilizing colored light emitting diodes (LEDs), the color control system arranged to control a backlight on a frame by frame basis, the color control system comprising: a color controller; an LED driver responsive to said color controller; a plurality of colored LED strings constituted of at least three different colors responsive to said LED driver; and a color sensor, exhibiting a tri-stimulus output, in optical communication with said plurality of colored LED strings, said color controller coupled to said tri-stimulus output of said color sensor, wherein said color controller is arranged, in each frame, to: sequentially light each of said plurality of colored LED strings via said LED driver at a respective time during the frame; provide a period during the frame wherein none of said colored LED strings are lit; receive from said color sensor an indication of an ambient light received at said color sensor during said provided period during the frame when none of said colored LED strings are lit; receive from said color sensor, an indication of the optical output of said colored LED strings during said respective times during the frame when said colored LED strings are lit; and control said LED driver responsive to said received indication of ambient light during the frame and said received indication of the optical output of said colored LED strings during the frame.