A display device includes a display panel, a first flexible film, and a second flexible film. The display panel includes a non-display area outside a display area. The first flexible film is attached to a first side surface of the display panel. The second flexible film is attached to a second side surface of the display panel. The display panel includes a signal line, a pad electrode, and a side surface connection electrode. The signal line is in the display area and connects the first and second flexible films. The pad electrode extends from the signal line. The side surface connection electrode is on the first and second side surfaces and directly contacts the pad electrode. The first flexible film and the second flexible film are coupled to the side surface connection electrode and are electrically connected to the signal line.