TFT-LCD source driver employing frame cancellation and half decoding method and source line driving method

A frame offset and a TFT-LCD source driver and the source line drive method which employs a half-decoding method is disclosed. TFT-LCD source driver of the present invention outputs the source line driving voltage every two channels of the plurality of channels. Optionally with positive first and second chopping of the first and the output of the sub-half-decoder for generating a second gray-scale voltage of the positive half-decoder and a negative polarity for generating a gray scale voltage in response to the chopping control signal MUX portion of claim 1 and 2 is transmitted to the output buffer. A first and a second output of the output buffer is output to the first and second polarity through the mux channel portion in response to the polarity control signal. Accordingly, by outputting a drive voltage having a second gray-scale difference between the two channels for a fixed frame repeatedly, it looks as if the gray scale voltage is output that corresponds to the middle.