A source driver and a liquid crystal display

The invention provides a source electrode driver and a liquid crystal display. The source electrode driver comprises a two-way displacement register which is connected to a time sequence controller, and a plurality of data channels, wherein one of the ends of the data channels is connected to the two-way displacement register, and while the other one of the ends of the data channels is connected to a thin film transistor and used for outputting analog voltage to the thin film transistor; each data channel comprises a data temporary storage device and a digital analog converter; the digital analog converter is shared by two adjacent data channels and is used for reversing the polarity of reference voltage by receiving a row reversing signal of the time sequence controller so as to determine the polarity of the output voltage of two adjacent data channels. According to the source electrode driver, two data channels share one digital analog converter, so that the area of the source electrode driver is reduced, and the cost can be saved.