Display driver and display device

A display device comprising:

• a display panel that includes display cells, a common electrode connected to the display cells in common, and first and second terminals connected to the common electrode;
• and
• a display driver that supplies driving voltages based on a video signal and a common voltage to the display panel, wherein
• the display driver includes:
• a common voltage generation part that receives a reference common voltage, generates the common voltage by amplifying the reference common voltage, and applies the common voltage to the first terminal;
• a reference gamma voltage generation part that generates first to k-th (k is an integer of 2 or more) reference gamma voltages based on a predetermined gamma characteristic;
• a gamma compensation part that takes in a voltage of the second terminal as a feedback common voltage from the display panel, and generates first to k-th compensation reference gamma voltages in which voltage values of the respective first to k-th reference gamma voltages are adjusted on the basis of a difference between the feedback common voltage and the reference common voltage;
• a gradation voltage generating circuit that generates gradation voltages on the basis of the first to k-th compensation reference gamma voltages;
• and
• a DA conversion part that selects a gradation voltage corresponding to a display data piece from the gradation voltages for each of display data pieces corresponding to the respective display cells based on the video signal, and supplies the selected gradation voltage as the driving voltage to the display panel.