Disclosed are a display device and a method of driving the same capable of improving display quality and reducing the manufacturing cost. A display device includes a display panel displaying images corresponding to image signals, a light-emission block supplying backlight to the display panel, and a backlight driver outputting a light data signal for determining luminance of backlight. One of a plurality of linear gamma curves is selected from a lookup table in accordance with average image luminance during prescribed frames, and the duty ratio of the light data signal is determined on the basis of the selected linear gamma curve. Each of the linear gamma curves represents the relationship between the average image luminance and the duty ratio of the light data signal.