Patent ID: 8026887

Claim:
A liquid crystal display, comprising: a liquid crystal display panel having a plurality of data lines, a plurality of gate lines, and a plurality of liquid crystal cells; a timing controller to determine gray levels of input digital video data and a time at which a polarity of a data voltage to be supplied to the data lines is inverted and generate a dynamic charge share control signal to indicate a time at which the gray level of the data voltage is changed from a white gray level to a black gray level and a time at which the polarity of the data voltage is inverted, and to detect weakness patterns in which the data of the white gray level and the black gray level are regularly arranged in the input digital video data and generate a dot inversion control signal for widening a horizontal polarity inversion time of data voltages to be supplied to the data lines when the weakness patterns are input; a data driving circuit to convert the digital video data from the timing controller into the data voltage, change the polarity of the data voltage, supply any one of a common voltage and a charge share voltage between a positive data voltage and a negative data voltage to the data lines in response to the dynamic charge share control signal, and widen the horizontal polarity inversion time of the data voltages in response to the dot inversion control signal; and a gate driving circuit to sequentially supply a scan pulse to the gate lines under the control of the timing controller, wherein the liquid crystal display panel includes first and second liquid crystal cell groups whose polarity is inverted every 2 frame periods, and a polarity inversion time of the first liquid crystal cell group and a polarity inversion time of the second liquid crystal cell group overlap, and wherein charge sharing is performed using any one of the common voltage and the charge share voltage only when the gray level of the input digital video data is changed from the white gray level to the black gray level and the polarity of the data voltages supplied to the liquid crystal display panel is inverted.