Data driver and display device including the same

A display device comprising:

• a pixel unit which includes a plurality of pixels connected to data lines;
• and
• a data driver which supplies data signals to the data lines,
• wherein the data driver includes a signal generator which includes a staircase waveform gray voltage signal generation which generates a plurality of staircase waveform gray voltage signals using a lowest gamma reference voltage, a highest gamma reference voltage, and a plurality of gamma voltages having a magnitude between the lowest gamma reference voltage and the highest gamma reference voltage, and a channel driver which includes a decoder which outputs one staircase waveform gray voltage signal selected from the staircase waveform gray voltage signals, an output circuit which outputs a gray voltage corresponding to the selected staircase waveform gray voltage signals to the data line as a data signal, and a reset unit which supplies one of the gamma voltages to the output circuit as a reset voltage.

A display device comprising:

• a pixel unit which includes pixels connected to a plurality of scan lines and a plurality of data lines;
• a data driver which supplies one staircase waveform gray voltage signal selected from a plurality of staircase waveform gray voltage signals to the pixel unit through the data line every horizontal period;
• and
• a scan driver which sequentially supplies scan signals to the pixel unit through the scan lines every horizontal period,
• wherein the data driver outputs a reset voltage between a previous horizontal period and a current horizontal period.