A display device includes a substrate including a display area and a non-display area, a first pad terminal and a second pad terminal disposed in the non-display area of the substrate, the first pad terminal arranged along a first column and the second pad terminal arranged along a second column, a first connection unit connected to the first pad terminal, a first driving integrated circuit (“IC”) connected to the first connection unit, a second connection unit connected to the second pad terminal and overlapping the first connection unit, and a second driving IC connected to the second connection unit. A maximum width of the second connection unit in a row direction is larger than a maximum width of the first connection unit in the row direction.