1. A display device comprising:a cover window comprising a curved portion and a flat portion; and
a display panel smaller in at least one of length or width than the cover window and laminated on the flat portion of the cover window, the display panel comprising:
a light-emitting unit on the substrate and comprising an organic light emitting device; and
a thin film on the light-emitting unit, the thin film comprising an organic layer and an inorganic layer,
wherein the display panel is laminated entirely on the flat portion, and
wherein the cover window is formed from a single piece.