A display device includes a display panel including a first display area having first pixels, and a second display area having second pixels. The display device includes a lower member below the display panel, a supporting member extended to the display panel, and a first slide module disposed between the lower member and the supporting member, the first slide module enabling the lower member and the supporting member to move relative to each other in a direction. The second display area protrudes beyond the lower member in the direction due to a movement by the first slide module. A number of first pixels per a unit area of the first display area is greater than a number of second pixels per the unit area of the second display area.