A data voltage according to the data signal D[m] is transmitted to the first end of the first transistor T21 by the turned-on second transistor T22. In addition, the first transistor T21 is diode-connected by the turned-on third transistor T23. Then, a voltage acquired by applying the threshold voltage of the first transistor T21 to the data voltage is transmitted to the first node N21. Thus, the first capacitor Cst stores and maintains a voltage that corresponds to a difference between voltages at opposite ends of the first capacitor Cst.

During the light emission period PC3, the first power ELVDD has the second level ELVDD_H and the second power ELVSS has the fifth level LEVSS_L. The light emission control signals EM[1] to EM[n] may have the gate-on voltage level VGL.

Then, the fourth transistor T24 is turned on, and a driving current by the voltage stored in the first capacitor Cst is transmitted to the organic light emitting diode OLED and thus the organic light emitting diode OLED emits light.

Although it is illustrated in FIG. 10 that pixels are driven by using the first power ELVDD and the second power ELVSS, which having voltage levels that fluctuate during one frame period, the pixels may be driven by various methods.