Patent ID: 7441907

Claim:
A light source driving method for controlling a first light source assembly and a second light source assembly of a projection apparatus to turn on and off at least once during each 1/n frame time, each 1/n frame time consisting of two first sub-frame periods, two second sub-frame periods, two third sub-frame periods, and two fourth sub-frame periods, the first light source assembly comprising a plurality of first color light sources and a plurality of third color light sources, and the second light source assembly comprising a plurality of second color light sources, the light source driving method comprising: turning on and off the first color light sources once sequentially in the first sub-frame period; turning on and off a part of the second color light sources once synchronously in the second sub-frame period; turning on and off the other second color light sources once synchronously in the third sub-frame period; and turning on and off the third color light sources once sequentially in the fourth sub-frame period; wherein each of the first sub-frame period and the fourth sub-frame period equals to 1/6n frame, and each of the second sub-frame period and the third sub-frame period equals to 1/12n frame time, where n is a positive integer.