A source driver includes a latch configured to store data based on or in response to a latch signal and output the data stored in the latch, a resistor string including a plurality of resistors configured to provide a plurality of grayscale voltages, a decoder connected to the resistor string, configured to select and output one of the plurality of grayscale voltages based on or in response to the data from the latch, an amplifier including a first input terminal, a second input terminal and an output terminal, a first control switch between the decoder and the first input terminal of the amplifier, and a second control switch between the first input terminal and the second input terminal of the amplifier. The first control switch and the second control switch are alternately turned on and off.