Patent ID: 7573455

Claim:
An analog buffer comprising: a comparator unit for comparing an input signal to be charged on a data line of a display panel with an output signal charged on the data line of the display panel to output a control signal; and a current switching unit for discharging an output current from the data line of the display panel or charging an input current on the data line of the display panel in accordance with the control signal output by the comparator unit, wherein the current switching unit comprising: a first current source for discharging an output current from the data line through an eleventh switch turned on or turned off by the control signal output by the comparator unit; and a second current source for charging an input current on the data line through a twelfth switch turned on or turned off by the control signal output by the comparator unit, wherein the comparator unit changes the level of the control signal to charge an input current on the data line when a level of the input signal is higher than a level of the output signal, and the comparator unit changes the level of the control signal to discharge an output current from the data line when the level of the input signal is lower the level of the output signal.