A display device includes: a display panel including a plurality of pixels that display an image, and a pixel pad portion; a first flexible film electrically connected to the display panel, the first flexible film including a first base film, an output pad portion, and an input pad portion, wherein the first base film includes a surface and an opposite surface facing each other, wherein the output pad portion is disposed on the surface of the first base film and is coupled to the pixel pad portion, and wherein the input pad portion is disposed on the surface of the first base film; a circuit substrate electrically connected to the display panel through the input pad portion, the circuit substrate including a first driving pad portion; and a first substrate disposed on the opposite surface and overlapping either the input pad portion or the output pad portion.