Patent ID: 8148916

Claim:
A driving device of a light source module, comprising: a programmable delay block configured to delay a first reference clock by a phase compensation amount, the first clock signal being a clock signal applied to a display panel, the delayed first reference clock being a second reference clock input to a local-dimming driver, wherein the second reference clock is delayed by a propagation delay amount within the local-dimming driver; a phase controller including the compensating delay block, configured to control the phase compensation amount to make the sum of the propagation delay amount and the phase compensation amount approximately equal to an integral multiple of the period of the first reference clock, and to generate the second reference clock by delaying the first reference clock by the phase compensation amount; and the local-dimming driver configured to driving a plurality of the light-emitting blocks by outputting driving signal synchronized and in-phase with the first reference clock based on receiving the second reference clock and a dimming level of each of the light-emitting blocks.