A display device includes a display device, a window, and an adhesive material. The display panel includes a display area and a non-display area. The window is on the display panel. The adhesive material is between the display panel and the window. The window includes a base substrate and a blocking barrier. The base substrate includes a first area overlapping the display area, a second area overlapping the non-display area, and a third area protruding outwardly from the display panel. The blocking barrier is on the second area of the base substrate, includes convex patterns and an inner surface facing a central portion of the base substrate. The inner surface of the blocking barrier and the convex patterns contact the adhesive material.