Patent ID: 7978163
Filing Date: 2011-07-12
Classification: G09G

Abstract:
1. A driving apparatus of a liquid crystal display, comprising: a liquid crystal display panel provided with a plurality of gate lines and a plurality of data lines; a gate driver that supplies a gate pulse to the plurality of gate lines; a data driver that supplies a positive polarity gray scale level voltage and a negative polarity gray scale level voltage to the plurality of data lines; a controller that controls a common voltage level supplied to the liquid crystal display panel based on a supply point of a gate pulse; and a common voltage supplier that alternatively supplies a first common voltage and a second common voltage defined as a division reference of the positive polarity gray scale level voltage and the negative polarity gray scale level voltage based on a control signal of the controller to the liquid crystal display panel, wherein a level of the first common voltage is set to have a higher level than a level of the second common voltage, wherein the controller controls the common voltage supplier to alternatively supply the first common voltage and the second common voltage on a state that the positive gray scale level voltage is supplied, and controls the common voltage supplier to supply the second common voltage level to the liquid crystal display panel during a constant time from a falling edge point of a gate pulse, wherein the falling edge point is when the gate pulse falls from the high level to the low level, and wherein the constant time is less the period than a period of the positive gray scale level voltage or the negative gray scale level voltage, wherein the width of the second common voltage is less than that of the gate pulse, and wherein the level of the first common voltage is supplied to the liquid crystal display panel during the section of the gate pulse.