An organic light emitting display device comprising: a scan driver for sequentially supplying a scan signal through scan lines; a data driver for supplying an initial voltage (Vinit) through data lines during a first period when the scan signal is supplied through a corresponding one of the scan lines, and for supplying data signals to the data lines during a second period when the scan signal is supplied through the corresponding scan line, the second period following the first period; and pixels (140, 140') at crossing regions of the scan lines and the data lines, wherein a pixel coupled to an i-th ("i" is a natural number) scan line and a j-th ("j" is a natural number) data line comprises: an organic light emitting diode having a first electrode coupled to a power source; a first transistor for controlling current flowing through the organic light emitting diode; a second transistor coupled to the j-th data line and a second node, wherein a gate electrode of the second transistor is coupled to the i-th scan line, a first electrode of the second transistor is coupled to the j-th data line and a second electrode of the second transistor is coupled to the second node; a third transistor coupled between a first node that is coupled to a gate electrode of the first transistor and the second node, wherein a gate electrode of the third transistor is coupled to an (i+1)-th scan line, a first electrode of the third transistor is coupled to the second node and a second electrode of the third transistor is coupled to the first node; a fourth transistor coupled between the first node and a reference voltage source (Vref), wherein a gate electrode of the fourth transistor is coupled to the i-th scan line; a first capacitor (C1, C2) coupled between the second node and a second electrode of the organic light emitting diode; and a second capacitor (C2, C1) coupled in parallel with the third transistor between the first node and the second node. a scan driver for sequentially supplying a scan signal through scan lines; a data driver for supplying an initial voltage (Vinit) through data lines during a first period when the scan signal is supplied through a corresponding one of the scan lines, and for supplying data signals to the data lines during a second period when the scan signal is supplied through the corresponding scan line, the second period following the first period; and pixels (140, 140') at crossing regions of the scan lines and the data lines, wherein a pixel coupled to an i-th ("i" is a natural number) scan line and a j-th ("j" is a natural number) data line comprises: an organic light emitting diode having a first electrode coupled to a power source; a first transistor for controlling current flowing through the organic light emitting diode; a second transistor coupled to the j-th data line and a second node, wherein a gate electrode of the second transistor is coupled to the i-th scan line, a first electrode of the second transistor is coupled to the j-th data line and a second electrode of the second transistor is coupled to the second node; a third transistor coupled between a first node that is coupled to a gate electrode of the first transistor and the second node, wherein a gate electrode of the third transistor is coupled to an (i+1)-th scan line, a first electrode of the third transistor is coupled to the second node and a second electrode of the third transistor is coupled to the first node; a fourth transistor coupled between the first node and a reference voltage source (Vref), wherein a gate electrode of the fourth transistor is coupled to the i-th scan line; a first capacitor (C1, C2) coupled between the second node and a second electrode of the organic light emitting diode; and a second capacitor (C2, C1) coupled in parallel with the third transistor between the first node and the second node. an organic light emitting diode having a first electrode coupled to a power source; a first transistor for controlling current flowing through the organic light emitting diode; a second transistor coupled to the j-th data line and a second node, wherein a gate electrode of the second transistor is coupled to the i-th scan line, a first electrode of the second transistor is coupled to the j-th data line and a second electrode of the second transistor is coupled to the second node; a third transistor coupled between a first node that is coupled to a gate electrode of the first transistor and the second node, wherein a gate electrode of the third transistor is coupled to an (i+1)-th scan line, a first electrode of the third transistor is coupled to the second node and a second electrode of the third transistor is coupled to the first node; a fourth transistor coupled between the first node and a reference voltage source (Vref), wherein a gate electrode of the fourth transistor is coupled to the i-th scan line; a first capacitor (C1, C2) coupled between the second node and a second electrode of the organic light emitting diode; and a second capacitor (C2, C1) coupled in parallel with the third transistor between the first node and the second node.