A display device includes a plurality of first constant voltage lines extended along a first direction and arranged along a second direction crossing the first direction, a plurality of second constant voltage lines extended along the second direction and arranged along the first direction, a first overlap area in which the plurality of first constant voltage lines and the plurality of second constant voltage lines overlap and contact each other, and a second overlap area in which the plurality of first constant voltage lines and the plurality of second constant voltage lines overlap and are insulated from each other.