An organic light emitting diode (OLED) display is disclosed. In one aspect, the OLED display includes a display unit positioned over a substrate and a lighting test circuit positioned outside the display unit on the substrate. The OLED display also includes a pad unit including a plurality of first pads configured to supply a control signal to the display unit, and a plurality of second pads positioned outside the first pads and configured to transfer a DC signal. The second pads include a power pad configured to supply power to the display unit, and a lighting test pad positioned outside the power pad.