Electroluminescent display device and method of driving the same

An electroluminescent display device comprising:

• a light-emitting element;
• a pixel drive circuit configured to apply a driving current to the light-emitting element;
• a power supply configured to provide a power voltage to the pixel drive circuit;
• a data drive circuit configured to provide a data voltage to the pixel drive circuit;
• and
• a gate drive circuit configured to provide a gate voltage to the pixel drive circuit,
• wherein the pixel drive circuit includes:
• a driving transistor having a source electrode connected to a first node, a drain electrode connected to a second node, and a gate electrode connected to a third node;
• an emission transistor connected between the driving transistor and the light-emitting element;
• and
• an initialization transistor connected to the second node,
• wherein the pixel drive circuit includes a first initialization period, a programming period, an on bias stress (OBS) period, a second initialization period, and a light emission period,
• wherein, during the second initialization period, the initialization transistor is turned on to apply an initialization voltage to the second node, and
• wherein a difference between a voltage of the drain electrode of the driving transistor and a voltage of an anode of the light-emitting element during the OBS period is greater than a difference between the voltage of the drain electrode of the driving transistor and the voltage of the anode of the light-emitting element during the second initialization period.