Patent ID: 7580016

Claim:
A backlight unit, comprising: a light source part having red, green and blue light sources; and a light source controller to generate a common control wave and drive each of the red, green and blue light sources based on a dimming signal and the common control wave, wherein the light source controller comprises; a common triangular wave generator to generate the common triangular wave; a red light source controller driving the red light source, wherein the a red light source controller includes a red comparator generating a red driving signal for driving the red light source based on the common control wave and the red dimming signal; a green light source controller driving the green light source, wherein the green light source controller comprises a green comparator generating a green driving signal for driving the green light source with the common control wave and the green dimming signal; and a blue light source controller driving the blue light source, wherein the blue light source controller comprises a blue comparator generating a blue driving signal for driving the blue light source with the common control wave and the blue dimming signal, wherein the common triangular wave from the common triangular wave generator is commonly supplied to the red, green and blue comparators, wherein the red, green and blue light emitting driving signals are synchronized with each other by use of the common triangular wave.