Patent ID: 8115756

Claim:
A display driver integrated circuit comprising: a data counter outputting first through n-th gamma data in response to a clock signal; a comparison unit comparing input image data with each of the first through n-th gamma data so as to output a comparison signal; a gray voltage generation unit generating first through n-th gray voltages in response to the first through n-th gamma data; and a sample and hold circuit comprising a first sub sample and hold circuit and a second sub sample and hold circuit and outputting one of the first through n-th gray voltages in response to the comparison signal, wherein, while the first sub sample and hold circuit is performing sampling, the second sub sample and hold circuit outputs one of the first through n-th gray voltages, or while the second sub sample and hold circuit is performing sampling, the first sub sample and hold circuit outputs one of the first through n-th gray voltages, and wherein the comparison unit comprises first through m-th XNOR gates (where m denotes the number of bits of the input image data) performing XNOR operations on the input image data and the gamma data; and an AND gate performing an AND operation on output signals of the first through m-th XNOR gates so as to output a result of the AND operation as the comparison signal.