A sub-pixel of an organic light emitting display device according to an embodiment includes an organic light emitting diode connected to a first node; a driving transistor comprising a first electrode, a second electrode connected to the first node, and a gate electrode connected to a second node; a first capacitor connected between the first node and the second node; a second capacitor connected between an emission control line and the second node; a first transistor comprising a first electrode connected to the first electrode of the driving transistor, a second electrode connected to the second node, and a gate electrode connected to a scan line; and a second transistor comprising a first electrode connected to a high potential voltage line, a second electrode connected to the first electrode of the driving transistor, and a gate electrode connected to the emission control line.