Patent ID: 7391402

Claim:
A method for driving, which comprises: providing an In-Plane switching (IPS) mode LCD device comprising: a plurality of gate and data lines crossing each other to define multiple pixel regions, a plurality of thin film transistors (TETs) alternately positioned at lower and upper side pixel regions adjacent to the corresponding gate line, and a plurality of common lines in a zigzag 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, said common voltage being synchronized with a scanning signal supplied to the first gate line, and a gate low voltage supplied to each gate line is classified into 2 levels, and the 2 levels are inverted in synchronization with a transition of the common voltage, wherein the gate low voltage is inverted to a gate low 1 level voltage having a value lower than a minimum value of a pixel voltage, and an a gate low 2 level voltage having a value higher than the minimum value of the pixel voltage, and wherein the gate low 2 level voltage is applied to the corresponding gate line when the first common voltage Vcom(+) is applied to the corresponding common line, and the gate low 1 level voltage is applied to the corresponding gate line when the second common voltage Vcom(−) is applied to the corresponding common line.