Patent ID: 8558762

Claim:
A light emitting display device, comprising: a pixel portion including a plurality of pixels, each pixel comprising a second transistor and an organic light emitting diode (OLED), with one of source and drain electrodes of the second transistor being connected to an anode of the OLED; a scan driver adapted to supply scan signals to scan lines connected to a gate electrode of a first transistor included in each of the plurality of pixels and to supply at least one scan signal to a synchronizer; a data driver adapted to supply data signals to data lines connected to the plurality of pixels; a DC/DC converter adapted to supply a first voltage different from the scan and data signals directly to another one of source and drain electrodes of the second transistor included in each of the plurality of pixels and to supply a second voltage to a cathode of the OLED included in each of the plurality of pixels; and the synchronizer adapted to, when the scan signals are converted into a turn off voltage, maintain a ripple voltage of the first voltage at a predetermined level.