A source driver for a panel includes a plurality of driver cells. Each of the driver cells includes an output driver, a plurality of bias voltage generators and a selector. The output driver is configured to output a plurality of display data to the panel. The plurality of bias voltage generators is coupled to the output driver. Each of the bias voltage generators is configured to provide at least one bias voltage for the output driver. The selector, coupled to the output driver, is configured to select the bias voltage from one of the bias voltage generators to be provided for the output driver according to the plurality of display data.