Patent ID: 7986288

Claim:
A liquid crystal display device comprising: a liquid crystal panel having a plurality of gate lines and data lines; a data driver including a digital-to analog converter (DAC) supplying a data voltage to the plurality of data lines; first switches between the data lines; a second switch connecting one of the data lines; third switches on the data lines between the DAC and the liquid crystal panel; a buffer unit on the data lines between the DAC and the third switches; a gate driver supplying a scan signal to the plurality of the gate lines; and a controller that generates at least three signals for driving the liquid crystal panel during first to third periods, wherein the buffer unit comprises: a plurality of output buffers corresponding to the data lines; and a current source between a controller and the output buffers, wherein during the first period, the first switches are turned on under the control of a first signal to be short-circuited between the data lines and then charge the data lines with a common voltage, the second switch is turned off under the control of a second signal, the third switches are turned off under the control of a third signal, and the output buffers are inactivated under the control of a driving current from the current source under the control of a fourth signal.