A display device includes a substrate including a display area and a non-display area, a reference voltage supply line disposed in the non-display area and transmitting a reference voltage, and a driving voltage supply line disposed in the non-display area and transmitting a driving voltage. The reference voltage supply line includes a straight line part extending in a first direction and a curved line part extending from the straight line part to be bent, and the curved line part of the reference voltage supply line is disposed along a periphery of the display area.