Patent ID: 8228287

Claim:
A liquid crystal display device comprising: a liquid crystal panel having a plurality of gate lines, a plurality of data lines, a plurality of common lines, a first common voltage supply line and a second common voltage supply line spaced apart, wherein the first and second common voltage supply lines are connected to the plurality of common lines; a common voltage generator for generating a first common voltage and a second common voltage and for supplying the first and second common voltages to the first and second common voltage supply lines respectively; a first common voltage compensator to receive the first common voltage from the common voltage generator and directly receive a first ripple voltage from the first common voltage supply line and to compensate the first common voltage to output a first compensated common voltage to the first common voltage supply line; a second common voltage compensator to receive the second common voltage from the common voltage generator and directly receive a second ripple voltage from the second common voltage supply line and to compensate the second common voltage to output a second compensated common voltage to the second common voltage supply line; wherein the first common voltage supply line and the second common voltage supply line are arranged in parallel to the plurality of data lines around both edges of the liquid crystal panel, wherein the plurality of common lines are connected between the first and second common voltage supply lines in parallel to the plurality of gate lines, wherein the first compensated common voltage comprises a voltage obtained by inverting a phase of the first ripple voltage and adding the phase-inverted first ripple voltage to the first common voltage, wherein the second compensated common voltage comprises a voltage obtained by inverting a phase of the second ripple voltage and adding the phase-inverted second ripple voltage to the second common voltage, wherein when the first compensated common voltage is supplied to the first common voltage supply line, the first ripple voltage generated at the first common voltage supply line is offset by the first compensated common voltage, wherein when the second compensated common voltage is supplied to the second common voltage supply line, the second ripple voltage generated at the second common voltage supply line is offset by the second compensated common voltage, wherein the first and second compensated common voltages are simultaneously supplied to the first and second common voltage supply lines, respectively; wherein the first common voltage and the second common voltage have different magnitudes.