FIG. 3 and FIG. 4 are timing diagrams of an exemplary driving method of a display device including the pixel of FIG. 2. As shown in FIG. 3 and FIG. 4, the display device may operate by a simultaneous light emission method that includes non-light emission periods PA1 to PA3 during which pixels PX do not emit light and a light emission period PA4 during which the pixels PX simultaneously emit light.

The non-light emission period may include an initialization period PA1 during which the gate of the first transistor T1 and the anode of the organic light emitting diode OLED are initialized, a threshold voltage compensation period PA2 during which the first transistor T1 is diode-connected, and a data writing period PA3 during which data signals are written in the pixels PX.

The pixels PX may be connected to the first power ELVDD, the second power ELVSS, and the initialization power VINT, with each having a fluctuating voltage level within one frame period. For example, the first power ELVDD may have one of a first voltage level ELVDD_L, a second voltage level ELVDD_M that is higher than the first voltage level ELVDD_L, and a third voltage level ELVDD_H that is higher than the second voltage level ELVDD_M. The initialization voltage VINT may have one of a fourth voltage level VINT_L, and a fifth voltage level VINT_H that is higher than the fourth voltage level VINT_L. The second power ELVSS may have one of a sixth voltage level ELVSS_L, and a seventh voltage level ELVSS_H that is higher than the sixth voltage level ELVSS_L.