Patent ID: 7342567

Claim:
A TFT-LCD source driver that outputs source line driving voltages to every two channels among a plurality of channels, the TFT-LCD source driver comprising: a positive half decoder that generates a positive first and second gray scale voltages; a negative half decoder that generates a negative first and second gray scale voltages; a first chopping multiplexer that selectively transmits the positive first and second gray scale voltages, output from the positive half decoder, to a first output buffer in response to a chopping control signal, wherein the first output buffer amplifies the output signal of the first chopping multiplexer; a second chopping multiplexer that selectively transmits the negative first and second gray scale voltages, output from the negative half decoder, to a second output buffer in response to the chopping control signal, wherein the second output buffer amplifies the output signal of the second chopping multiplexer; a first polarity multiplexer that selects one of output signals of the first and second output buffers and outputs it as a driving voltage of a first channel in response to a polarity control signal; and a second polarity multiplexer that selects one of output signals of the first and second output buffers and outputs it as a driving voltage of a second channel in response to the polarity control signal.