Organic light emitting display device and method for driving the same

A method for driving an organic light-emitting display device including an organic light-emitting element;

• a driving transistor connected in series with the organic light-emitting element, the driving transistor and the organic light-emitting element being disposed between a first driving power supply line for supplying a first driving voltage and a second driving power supply line for supplying a second driving voltage lower than the first driving voltage;
• a first transistor configured to turn on based on an i-th scan signal and supply a data voltage to a first node, wherein i is a natural number greater than or equal to 2 and less than or equal to N, and wherein N is a number of scan-lines;
• a capacitor disposed between the first node and a gate electrode of the driving transistor, wherein the capacitor is configured to supply a turn-on signal of the driving transistor to the gate electrode of the driving transistor based on the data voltage;
• and a second transistor configured to turn on based on a (i−1)-th scan signal and supply a first reference voltage to a second node, the method comprising:
• initializing the second node to the first reference voltage by turning on the second transistor for a first period, wherein the second node is disposed between the driving transistor and the capacitor, and wherein the capacitor is disposed between the first and second nodes;
• and
• supplying the data voltage to the first node by turning off the second transistor and turning on the first transistor for a second period.

An organic light-emitting display device comprising:

• an organic light-emitting element;
• a driving transistor connected to the organic light-emitting element,
• a first driving power supply line configured to supply a first driving voltage to the driving transistor;
• a second driving power supply line configured to supply a second driving voltage to the organic light-emitting element, the second driving voltage being lower than the first driving voltage;
• a first transistor configured to turn on based on an i-th scan signal and supply a data voltage to a first node, wherein i is a natural number greater than or equal to 2 and less than or equal to N, and wherein N is a number of scan-lines;
• a capacitor disposed between the first node and a gate electrode of the driving transistor, wherein the capacitor is configured to supply a turn-on signal of the driving transistor to the gate electrode of the driving transistor based on the data voltage;
• a second transistor configured to turn on based on a (i−1)-th scan signal and supply a first reference voltage to a second node;
• and
• a third transistor configured to supply a second reference voltage to the first node,
• wherein the second node is disposed between the driving transistor and the capacitor, and
• wherein the capacitor is disposed between the first and second nodes.