Patent ID: 8284137

Claim:
An apparatus for driving a backlight of the direct type comprising: a pulse width modulation signal phase shifting unit that shifts phases of red, green, and blue pulse width modulation signals and outputs the phase-shifted pulse width modulation signals by a predetermined angle such that an overlapping region among red, green and blue pulse width modulation signals is minimized; red, green, and blue light emitting diode driving units that drive red, green, and blue light emitting diode arrays by using the phase-shifted red, green, and blue pulse width modulation signals; and red, green, and blue light emitting diode arrays that are lit by the red, green, and blue pulse width modulation signals, which are supplied from the light emitting diode driving units so as to emit red, green, and blue light, wherein the pulse width modulation signal phase shifting unit is configured to sequentially shift the phases of the pulse width modulation signals amongst sets of red, green, and blue light emitting diode arrays by a predetermined angle, and at the same time, to shift the phases of the respective red, green, and blue pulse width modulation signals amongst each other in a light emitting diode array by the predetermined angle, and then to output the resequenced phase-shifted pulse width modulation signals, and wherein a width of the green phase-shifted pulse width modulation signal is wider than widths of the red and blue phase-shifted pulse width modulation signals.