A display device is disclosed. In one aspect, the display device includes a display panel including a first display panel and a second display panel. The display device also includes a first light source unit disposed to correspond to the first display panel, a second light source unit disposed to correspond to the second display panel, a direct current (DC)-DC converter configured to receive a driving power and generate a first light source driving voltage configured to drive the first light source unit, and a regulator configured to receive the driving power and generate a second light source driving voltage configured to drive the second light source unit.