Patent ID: 8319717

Claim:
A liquid crystal display device comprising: a liquid crystal display panel including a plurality of data lines crossing a plurality of gate lines and liquid crystal cells arranged in a matrix; a timing controller generating a polarity control signal, deciding if a predetermined weak pattern data is input, and shifting a phase of the polarity control signal in a next frame period following a frame showing the weak pattern data when the weak pattern data is input; a data driving circuit reversing the polarity of the data voltage in response to the polarity control signal and supplying to the data lines; and a gate driving circuit supplying a gate pulse to the gate lines sequentially, wherein the timing controller comprises: a data analyzer deciding each gray-scale level of the input digital video data based on most significant bits of the input digital video data, deciding a representative gray-scale level of each line based on each gray-scale level to detect the weak pattern data, and generating a selection signal within a blank period between the previous frame period and the next frame period when the weak pattern data is inputted; and a phase controller generating a first polarity control signal and a second polarity control signal having different phase from the first polarity control signal, and selecting any one of the first and the second polarity control signals in response to the selection signal, wherein the weak pattern data includes a data pattern in which a white gray scale data and a black gray scale data are alternately disposed in horizontal direction of the liquid crystal display panel.