Display device and method of manufacturing the same

A method of manufacturing a display device, the method comprising:

• preparing a substrate including a display area, a pad area, and a bending area, wherein the bending area is positioned between the display area and the pad area, is divided into a first area and a second area surrounding the first area, and is bent from the display area;
• preparing a protection film in which an opening is defined to correspond to the first area of the bending area;
• adhering the protection film to the display area, the pad area, and the second area of the substrate, wherein the opening overlaps the first area;
• and
• providing a reinforcing agent in the opening.