A display device is disclosed, which includes: a substrate having a first surface and a second surface, wherein the first surface is opposite to the second surface; a first conductive element disposed on the first surface; a second conductive element disposed on the second surface; and a connecting element disposed in a through via of the substrate, wherein the connecting element electrically connects the first conductive element and the second conductive element; wherein the second conductive element has a first oxygen atomic concentration, the connecting element has a second oxygen atomic concentration, and the first oxygen atomic concentration is greater than the second oxygen atomic concentration.