A digital to analog converter includes a first decoder, a gamma reference voltage decoder unit and an active resistor string unit. The first decoder receives 2(N-2) first gamma voltages and selects 2(N-2-P) second gamma voltages among the first gamma voltages in response to P bit data, where N is an odd number not less than 9, and N−1=2P. The gamma reference voltage decoder unit selects successive two high gamma tab voltages among N high gamma tab voltages in response to the P bit data and provides the selected successive two high gamma tab voltages as a first gamma reference voltage and a second gamma reference voltage. The active resistor string unit divides the first gamma reference voltage and the second gamma reference voltage and provides 2(N-2) grayscale voltages.