A display device includes a substrate including a display area and a pad area positioned at one side of the display area, a first pad electrode disposed on the pad area of the substrate, a second pad electrode disposed on the pad area of the substrate to be spaced apart from the first pad electrode, a dam structure disposed between the first pad electrode and the second pad electrode, an adhesive member disposed on the first pad electrode, the second pad electrode and the dam structure, where the adhesive member includes a first conductive ball, a second conductive ball and a, and an electronic component disposed on the adhesive member. The dam structure includes a photo-curable polymer material and is formed by an inkjet process. The adhesive member includes a thermosetting polymer material, and is formed by an inkjet process.