Patent ID: 7907106

Claim:
An LCD comprising: a liquid crystal panel having a gate line, a data line, and a pixel connected to the gate line and the data line; a grayscale voltage generating unit generating a grayscale voltage; a driving voltage generating unit generating a gate off voltage, a positive polarity gate on voltage, and a negative polarity gate on voltage, wherein the negative polarity gate on voltage is lower than the positive polarity gate on voltage; a gate driving unit supplying the gate line with the positive polarity gate on voltage or the negative polarity gate on voltage; a data driving unit supplying the pixel with a data voltage, wherein the data driving unit is supplied with the grayscale voltage from the grayscale voltage generating unit; and a signal control unit controlling the data driving unit to alternately apply a positive polarity data voltage or a negative polarity data voltage to the pixel, and controlling the gate driving unit to apply the positive polarity gate on voltage to the pixel supplied with the positive polarity data voltage and the negative polarity gate on voltage to the pixel supplied with the negative polarity data voltage, wherein the positive polarity gate on voltage comprises a first voltage Vg 1 and a second voltage Vg 2 less than the first voltage Vg 1 , wherein the negative polarity gate on voltage comprises a third voltage Vg 3 and a fourth voltage Vg 4 less than the third voltage Vg 3 , and wherein the fourth voltage Vg 4 is lower than the second voltage Vg 2 .