Patent ID: 8654041

Claim:
An organic light emitting display device comprising: a scan driver for sequentially supplying a scan signal through scan lines; a data driver for supplying an initial power through data lines during a first period of a time period when the scan signal is supplied through a corresponding scan line of the scan lines, and for supplying data signals to the data lines during a second period of the time period when the scan signal is supplied through the corresponding scan line, the second period following the first period; and pixels at crossing regions of the scan lines and the data lines, wherein a pixel coupled to an i-th (“i” is a natural number) scan line of the scan lines and a j-th (“j” is a natural number) data line of the data lines from among the pixels comprises: an organic light emitting diode having a cathode electrode coupled to a second power source; a first transistor for controlling current flowing through the organic light emitting diode; a second transistor coupled to the j-th data line and a second node, the second transistor being on when the scan signal is supplied through the i-th scan line; a third transistor coupled to the second node and coupled directly to a first node at a gate electrode of the first transistor, the third transistor being off when the second transistor is on; a fourth transistor coupled directly between the first node and a reference power source, the fourth transistor being on when the scan signal is supplied through the i-th scan line, such that the second transistor and the fourth transistor concurrently turn on and off; and a first capacitor coupled between the second node and an anode electrode of the organic light emitting diode.