A display device including: a pixel unit including pixels for generating light in response to a first power and a second power; a power supply for supplying the first power to a first power line and the second power to a second power line; and a protection circuit for discharging a voltage of the first power line and the second power line when the pixels are in a turn-off state, and putting the first power line and the second power line in a high impedance state after a predetermined time.