A display device is disclosed. In one aspect, the display device includes a display panel including a plurality of pixels, and a data driver including a plurality of data output unit buffers electrically connected to a plurality of data lines electrically connected to the pixels. Each of the data output unit buffers includes an output terminal, a first transistor for applying a high level data voltage to the output terminal, and a second transistor for applying a low level data voltage to the output terminal. Each of the data output unit buffers also includes a first switch electrically connecting the first and second transistors to the output terminal, and a second switch electrically connecting a ground voltage to the output terminal.