Patent ID: 7859505

Claim:
An output buffer for a source driver of an LCD, comprising: an amplifier section amplifying an analog image signal; an output section outputting a source line driving signal for driving a source line of the LCD in response to a signal amplified by the amplifier section; and a slew rate controller section, setting a capacitance of a capacitor section to a first capacitance, during a first charge sharing period in which the source line is precharged to a first precharge voltage, setting the capacitance of the capacitor section to a second capacitance smaller than the first capacitance during a second charge sharing period in which the source line driving signal is supplied to the source line, and setting the capacitance of the capacitor section to the first capacitance while the source line driving signal is maintained after the second charge sharing period, wherein the first capacitance is set by activating first and second slew rate control signals and the second capacitance is set by deactivating the first and second slew rate control signals, and the first slew rate control signal is obtained by delaying a sharing switch control signal for controlling the source line to be precharged to the first precharge voltage or delaying the sharing switch control signal by the first charge sharing period through a D flip flop.