Patent ID: 7443372

Claim:
A method for driving, comprising: providing an In-Plane switching (IPS) mode LCD device that includes a plurality of gate and data lines crossing each other to define a plurality of pixel regions, a plurality of thin film transistors (TFT) alternately positioned at lower and upper side pixel regions adjacent to the corresponding gate line, and a plurality of common lines in a zigzag configuration along the thin film transistors in the pixel regions; and applying a common voltage, wherein a first common voltage or a second common voltage is inversely applied to even numbered common lines or odd numbered common lines in one vertical period, the first or second common voltage being synchronized with a gate High voltage supplied to the first gate line, and the second common voltage lower than the first common voltage, wherein the gate High voltage and first and second gate Low voltages are applied to each gate line, the second gate Low voltage lower than the first gate Low voltage, wherein, while the first common voltage is supplied to the corresponding common line, the gate High voltage and the first gate Low voltage are supplied to the corresponding gate line and while the second common voltage is supplied to the corresponding common line, the gate High voltage and first and second Low voltages are supplied to the corresponding gate line, wherein the first gate Low voltage of the corresponding gate line is changed to the second gate Low voltage when the first common voltage of the corresponding common line is changed to the second common voltage, while the first gate Low voltage of the corresponding gate line is sustained without voltage change when the second common voltage of the corresponding common line is changed to the first common voltage, and wherein, while the second common voltage is supplied to the common line, the second gate Low voltage of the corresponding gate line is changed to the first gate Low voltage after the next gate High voltage is supplied to the corresponding gate line.