Patent ID: 8633887

Claim:
A data driver IC of a liquid crystal display comprising: a shift register for a shift pulse; a latch part including a plurality of latches, the latches sampling a digital data in accordance with the shift pulse during a full color mode, and one latch of the latches sampling a most significant bit of the digital data in accordance with the shift pulse during a 8 color mode; a digital-to-analog converter for converting the sampled digital data into an analog signal; an analog signal supplying part generating first and second analog signals corresponding to a black signal level and a white signal level, respectively; a color conversion control signal supplying part controlling whether to display the digital data in the 8 color mode or the full color mode; a plurality of selectors, each of the selectors selecting and outputting one of the first analog signal corresponding to the black signal level and the second analog signal corresponding to the white signal level according to the most significant bit of the digital data; and a multiplexer, responsive to a color conversion control signal from the color conversion control signal supplying part, transferring one of the analog signal selected from each of the selectors and the analog signal converted from the digital-to-analog converter to a corresponding data line, wherein the most significant bit of the digital data from the one latch is directly and simultaneously transferred to all of the selectors, not being passed through the digital-to-analog converter in the 8 color mode, wherein the first analog signal corresponding to the black signal level or the second analog signal corresponding to the white signal level is selected by each of the selectors depending on whether the sampled MSB of the digital data is high or low, and transferred to the multiplexer in the 8 color mode, and wherein a power for operating the latches is only supplied to the one latch and is not supplied the remaining latches of the latches during the 8 color mode.