Patent ID: 8242983

Claim:
An organic light emitting display device comprising: a scan driver for driving scan lines, light emitting control lines and control lines; a data driver for supplying a reference voltage from a reference power supply and a data signal to data lines; and pixels at crossing regions of the scan lines and the data lines, each of the pixels comprising: an organic light emitting diode having a cathode electrode coupled with a second power supply; a second transistor for supplying a current to the organic light emitting diode; a first transistor coupled between a data line of the data lines and a gate electrode of the second transistor, the first transistor configured to turn on when a scan signal is supplied to a corresponding scan line of the scan lines; a third transistor coupled between an initialization power supply for supplying an initialization voltage and a drain electrode of the second transistor, the third transistor configured to turn on when a control signal is supplied to a corresponding control line of the control lines to supply the initialization voltage to the drain electrode of the second transistor; a fourth transistor coupled between the drain electrode of the second transistor and a first power supply, the fourth transistor configured to turn off when a light emitting control signal is supplied to a corresponding one of the light emitting control lines and turn on when the light emitting control signal is not supplied to the light emitting control line; and a storage capacitor coupled between a source electrode and the gate electrode of the second transistor.