PIXEL AND ORGANIC LIGHT EMITTING DISPLAY DEVICE

摘要

PURPOSE: Pixels and an organic light emitting display device using the same are provided to display image with uniform illuminance by compensating the threshold voltage of a driving transistor. CONSTITUTION: A pixel circuit(142) includes transistors and a storage capacitor(Cst). A first transistor(M1) controls the amount of a current. The amount of the current flows from the first power source to the second power source through an organic light emitting diode(OLED). A second transistor(M2) is connected between a reference power source and the gate electrode of the first transistor. A third transistor(M3) transmits data signal which is supplied to a data line. A fifth transistor(M5) is controlled by light emitting signal. The storage capacitor is connected between a common node and the gate electrode of the first transistor. The common node is located between the fifth transistor and the third transistor. A forth transistor(M4) reduces the voltage of data signal as much as the threshold voltage of the forth transistor. The forth transistor applies the voltage of the data signal to the common node.