Organic light emitting display panel and organic light emitting display device including the same

An organic light emitting display device comprising:

• a substrate;
• a first conductive layer disposed on the substrate;
• a buffer layer disposed on the first conductive layer;
• an active layer disposed on the buffer layer;
• a first insulating film disposed on or over the active layer, the first insulating film overlapping a part of an upper surface of the active layer;
• a second insulating film disposed on or over the first insulating film, the second insulating film including a first contact hole exposing the part of the upper surface of the active layer;
• a third insulating film disposed on the second insulating film, the third insulating film including a second contact hole overlapping the first contact hole;
• and
• an electrode of an organic light emitting element disposed on the third insulating film, the electrode contacting the active layer through the first contact hole and the second contact hole,
• wherein an area in which the active layer and a second conductive layer contact is included in a node at which a reference voltage is applied to a driving transistor.