Display driver and display device

A display device comprising:

• a display panel in which a plurality of display cells are respectively connected to a plurality of data lines;
• and
• a display driver which drives the display panel based on a plurality of pixel data pieces representing a luminance level represented by a video signal,
• wherein the display driver includes a gradation reference voltage generator which generates a plurality of gradation reference voltages along first to k-th (k is an integer of 2 or more) gamma correction characteristics for different color components and a DA conversion unit which selects a gradation reference voltage corresponding to a luminance level represented by the pixel data piece from the plurality of gradation reference voltages for each of the plurality of pixel data pieces and outputs the gradation reference voltage as a gradation voltage, and
• wherein the gradation reference voltage generator includes a first ladder resistor which receives a first potential at one end and receives a second potential higher than the first potential at the other end to generate a plurality of voltages obtained by dividing a voltage between the first potential and the second potential, a second ladder resistor which receives the first potential at one end, receives the second potential at the other end, and receives each of a plurality of partial voltages among the plurality of voltages at a connection point between the resistors to generate the plurality of gradation reference voltages, first to k-th input amplifiers which receive first to k-th DC bottom potentials respectively corresponding to the first to k-th gamma correction characteristics, individually amplify the first to k-th DC bottom potentials, and output first to k-th amplified bottom potentials, and a first selector which receives the first to k-th amplified bottom potentials, sequentially selects one amplified bottom potential among the first to k-th amplified bottom potentials, and supplies the one selected amplified bottom potential to the one end of the first ladder resistor as the first potential.