A display device includes a main display unit and a liquid crystal display cover coupled with the main display unit. The liquid crystal display cover is movable between open and closed positions with respect to the main display unit. The liquid crystal display cover includes a lower substrate, an upper substrate, and a liquid crystal layer. The lower substrate includes a plurality of first pixels thereon. The upper substrate faces the lower substrate and has a first common electrode thereon. The liquid crystal layer is between the lower substrate and the upper substrate.