A display device is provided. The display device includes a substrate having a first surface and a second surface opposite to the first surface. The display device also includes a first conductive layer disposed on the first surface and a second conductive layer disposed on the second surface. The display device further includes a printed circuit board assembly disposed on the second surface and electrically connected to the second conductive layer, a processing unit disposed on and electrically connected to the printed circuit board assembly and a first connective portion at least partially disposed in the substrate and penetrating from the first surface to the second surface. The first conductive layer is electrically connected to the second conductive layer through the first connective portion.