A display driver and a display device are provided. The driver includes a first ladder resistor receiving a first potential at one end and a higher second potential at the other end to generate voltages obtained by dividing a voltage between first and second potentials; a second ladder resistor receiving first potential at one end, a second potential at the other end, and each of partial voltages among the voltages generated by the first ladder resistor at a connection point between the resistors to generate gradation reference voltages; first to k-th input amplifiers individually amplifying first to k-th DC bottom potentials respectively corresponding to first to k-th gamma correction characteristics to generate first to k-th amplified bottom potentials; and a first selector sequentially selecting one of the first to k-th amplified bottom potentials and supplying the selected one to one end of the first ladder resistor as a first potential.