Patent ID: 8866729

Claim:
A method for driving a light source unit for a liquid crystal display panel, comprising the steps of: (a) calculating average and maximum values of image signals applied to the liquid crystal panel; (b) calculating a representative value of the image signals from the average and maximum values of the image signals; and (c) determining a luminance of the light source unit based on the representative value of the image signals and driving the light source unit accordingly, wherein the liquid crystal panel comprises a plurality of regions, the average and maximum values of the image signals are calculated for each region, the representative value of the image signals is calculated for each region from L rep =(1−β)× L avg +β×L max , wherein L rep is the representative value of the image signals for a given region, L avg is the average value of the image signals for the given region, and L max is the maximum value of the image signals for the given region, β is a parameter whose value decreases as a difference between the maximum value of the image signals for the given region and the average values of the image signals for the given region increases, and is between 0 and 1, wherein the value of 13 is calculated from β=β min +α×(β max −β min ), wherein β min and β max are predetermined values for β, and α is a constant parameter for each region with a value between 0 and 1, and wherein the value of α decreases as a difference between the maximum value of the image signals for each region and the average value of the image signals for each region increases.