A source driver for a liquid crystal display (LCD) panel in which during a first predetermined period immediately after polarity of a voltage according to image data is inverted, each column terminal of the LCD panel is shorted to a common line through an output terminal and a second switch element, a first output amplifying portion is set to a high impedance state, and an output signal of a second output amplifying portion is fed back to a differential amplifying portion through a third switch element. During a period after the first predetermined period and before inversion of polarity of a voltage according to the image data, an output signal of the first output amplifying portion is supplied to the output terminal without passing though a switch element, and is fed back to the differential amplifying portion through a fourth switch element. The output signal of the second output amplifying portion is fed back to the differential amplifying portion through the first and fourth switch elements.