Patent ID: 7839418

Claim:
A method for driving a liquid crystal panel equipped with a plurality of unit pixels composed of 4-color sub-pixels comprising: generating a histogram from input 3-color source data, and extracting a gain value from the histogram; converting the 3-color source data into 4-color data according to the gain value; and converting the 4-color data into video data, and transmitting the video data to the unit pixels, wherein generating the histogram using a gray difference of input 3-color source data includes performing gamma-correction on the 3-color source data to generate linearized primary 3-color data, detecting maximum and minimum gray values for each unit pixel of the linearized primary 3-color data, and generating the histogram using a difference between the maximum and minimum gray values, wherein generating the histogram using a difference between the maximum and minimum gray values includes subtracting the minimum gray value from the maximum gray value, and generating the difference between the maximum and minimum gray values, counting the number of the unit pixels corresponding to the difference between the maximum and minimum gray values, and calculating histogram for each gray difference.