Patent ID: 7782335
Filing Date: 2010-08-24
Classification: G09G

Abstract:
1. An apparatus for driving a liquid crystal display (LCD) device, comprising: a liquid crystal panel including 4-color sub-pixels; a data driver to provide video data signals to each sub-pixel; a gate driver to provide a scan pulse to each sub-pixel; a data conversion part to generate a gain value by analyzing a ratio of an achromatic color signal or a chromatic color signal of 3-color source data inputted from an external source in a unit frame and convert the 3-color source data into 4-color data using the generated gain value, wherein the data conversion detects a maximum brightness value and a minimum brightness value of the 3-color source data and analyzis the ratio of the achromatic color signal or the chromatic color signal in the unit frame using the detected maximum and minimum brightness values; and a timing controller to provide the 4-color data received from the data conversion part to the data driver and control the gate driver and the data driver, wherein a data conversion part includes the gain value generation part including: a brightness detection part to detect the maximum brightness value and the minimum brightness value of the 3-color input data and output the detected maximum brightness value and a calculated maximum brightness value acquired by multiplying the minimum brightness value by a C value (C value being a positive real number); a comparator to compare the calculated maximum brightness value with the detected maximum brightness value and output a comparison result signal; a counter to count the comparison result signal in a unit frame and generate a count signal; and a gain value setting part to set the gain value according to the count signal.