Liquid crystal display device and method for driving the same

A liquid crystal display device comprising:

• a preparatory charging controller that receives, from a timing controller, current image data that are to be provided to m current pixels, where m is a natural number, among a plurality of pixels located at an nth horizontal line, where n is a natural number, and a current vertical polarity reversal control signal for controlling polarities of the current image data in a vertical direction, compares the current image data with previous image data that have been provided to m previous pixels corresponding to the current m pixels among a plurality of pixels located at an n−1th horizontal line, compares the current vertical polarity reversal control signal with a previous vertical polarity reversal control signal for controlling polarities of the previous image data in a vertical direction, and determines a logic value of a preparatory charging control signal based on results of the comparisons;
• and
• a data driver that performs one of a first operation, in which the data driver connects m data lines connected respectively to the m current pixels to each other and again separates the m data lines from each other, and a second operation, in which the data driver keeps the m data lines separated from each other, according to the logic value of the preparatory charging control signal from the preparatory charging controller and then provides the current image data from the timing controller to the m pixels
• wherein in the first operation, the m data lines for the m current pixels are connected to an average voltage that is charged in the m data lines and thereby set the same said average voltage for the m data lines, and in the second operation, the m data lines for the m current pixels are kept separated to maintain the voltages that are charged in the m data lines, respectively.