An organic light emitting display apparatus comprising: a substrate comprising a display area; a thin film transistor, hereinafter referred to as TFT, in the display area; an electrode power supply line outside the display area, wherein the electrode power supply line comprises a material that substantially reacts with an organic material; a first inorganic insulating layer covering the TFT and having a first open portion (181 a) through which at least a portion of the electrode power supply line is exposed; a second insulating layer on the first insulating layer and having a second open portion through which the first open portion (181 a) of the first insulating layer is exposed so that the second insulating layer does not contact the electrode power supply line, wherein the second insulating layer comprises organic material; a pixel electrode in the display area and on the second insulating layer so that the pixel electrode is electrically connected to the TFT; a third insulating layer covering the electrode power supply line exposed through the first insulating layer, the third insulating layer having a third open portion through which at least a portion of the pixel electrode is exposed, wherein the third insulating layer is a pixel defining layer and comprises an organic material; and an auxiliary conductive layer between the electrode power supply line, exposed through the first insulating layer, and the third insulating layer, so that the third insulating layer does not contact the electrode power supply line; a counter electrode contacting the electrode power supply ling and disposed above the display area;wherein the first insulating layer is a passivation layer. a substrate comprising a display area; a thin film transistor, hereinafter referred to as TFT, in the display area; an electrode power supply line outside the display area, wherein the electrode power supply line comprises a material that substantially reacts with an organic material; a first inorganic insulating layer covering the TFT and having a first open portion (181 a) through which at least a portion of the electrode power supply line is exposed; a second insulating layer on the first insulating layer and having a second open portion through which the first open portion (181 a) of the first insulating layer is exposed so that the second insulating layer does not contact the electrode power supply line, wherein the second insulating layer comprises organic material; a pixel electrode in the display area and on the second insulating layer so that the pixel electrode is electrically connected to the TFT; a third insulating layer covering the electrode power supply line exposed through the first insulating layer, the third insulating layer having a third open portion through which at least a portion of the pixel electrode is exposed, wherein the third insulating layer is a pixel defining layer and comprises an organic material; and an auxiliary conductive layer between the electrode power supply line, exposed through the first insulating layer, and the third insulating layer, so that the third insulating layer does not contact the electrode power supply line; a counter electrode contacting the electrode power supply ling and disposed above the display area;wherein the first insulating layer is a passivation layer.