An organic light-emitting display device comprising: an organic light emitting diode (OLED); a first electrode of a first transistor coupled to a first power (ELVDD) via a second node; a second electrode of the first transistor coupled to an anode electrode of the organic light emitting diode (OLED); a gate electrode of the first transistor connected to a first node; a first capacitor electrically connected between the first node and a third node; a second capacitor electrically connected between the second node and the third node; a second transistor electrically connected between the first capacitor and a data line (Dm) and comprising a gate electrode coupled to a scan line (Sn); a third transistor electrically connected between the first power (ELVDD) and the second node, and comprising a gate electrode coupled to a first emission control line; a fourth transistor electrically connected between the second node and the first electrode of the first transistor, and comprising a gate electrode coupled to a first control line; a fifth transistor electrically connected between the first capacitor and a reference power (Vref), and comprising a gate electrode coupled to a second control line; and a sixth transistor comprising a first electrode connected to an anode of the organic light emitting diode (OLED) and a gate electrode coupled to a third control line; wherein the second transistor is configured to be turned on in response to a scan signal supplied to the scan line (Sn) during: a first period when the first node is initialized; a second period when a threshold voltage of the first transistor is compensated; and a third period when a voltage corresponding to a data signal is stored. an organic light emitting diode (OLED); a first electrode of a first transistor coupled to a first power (ELVDD) via a second node; a second electrode of the first transistor coupled to an anode electrode of the organic light emitting diode (OLED); a gate electrode of the first transistor connected to a first node; a first capacitor electrically connected between the first node and a third node; a second capacitor electrically connected between the second node and the third node; a second transistor electrically connected between the first capacitor and a data line (Dm) and comprising a gate electrode coupled to a scan line (Sn); a third transistor electrically connected between the first power (ELVDD) and the second node, and comprising a gate electrode coupled to a first emission control line; a fourth transistor electrically connected between the second node and the first electrode of the first transistor, and comprising a gate electrode coupled to a first control line; a fifth transistor electrically connected between the first capacitor and a reference power (Vref), and comprising a gate electrode coupled to a second control line; and a sixth transistor comprising a first electrode connected to an anode of the organic light emitting diode (OLED) and a gate electrode coupled to a third control line; wherein the second transistor is configured to be turned on in response to a scan signal supplied to the scan line (Sn) during: a first period when the first node is initialized; a second period when a threshold voltage of the first transistor is compensated; and a third period when a voltage corresponding to a data signal is stored. a first period when the first node is initialized; a second period when a threshold voltage of the first transistor is compensated; and a third period when a voltage corresponding to a data signal is stored.