An organic light emitting display device comprising: a substrate including an active area (AA) that displays images and a pad area (PA) that connects to an external driving circuit; a thin-film transistor, "TFT" (T), including a drain electrode , a source electrode comprising a lower source electrode and an upper source electrode , and a gate electrode , wherein the drain electrode and the source electrode are in a same layer of the organic light emitting display device; an anode electrode , comprising a lower anode electrode , a central anode electrode and an upper anode electrode , in the active area (AA) of the substrate , wherein the lower anode electrode is a corrosion preventing layer formed of a transparent conductive material arranged to protect an upper surface of the upper source electrode and a lower surface of the central anode electrode ; an organic light emitting layer on the anode electrode ; a cathode electrode on the organic light emitting layer ; a signal pad on the pad area (PA) of the substrate , wherein the signal pad is in the same layer as the drain electrode and the source electrode of the TFT; a first pad electrode on the signal pad and connected with the signal pad via a contact hole (CH4), wherein the first pad electrode comprises a same material as the anode electrode ; a second pad electrode covering the first pad electrode ; an auxiliary electrode connected with the cathode electrode , the auxiliary electrode including: a first auxiliary electrode provided in a same layer as the anode electrode and horizontally spaced apart from the anode electrode ; and a second auxiliary electrode on the first auxiliary electrode , wherein the second auxiliary electrode is directly connected with the cathode electrode , wherein the second auxiliary electrode covers side surfaces and an upper surface of the first auxiliary electrode , and the second pad electrode covers an upper surface and side surfaces of the first pad electrode . a substrate including an active area (AA) that displays images and a pad area (PA) that connects to an external driving circuit; a thin-film transistor, "TFT" (T), including a drain electrode , a source electrode comprising a lower source electrode and an upper source electrode , and a gate electrode , wherein the drain electrode and the source electrode are in a same layer of the organic light emitting display device; an anode electrode , comprising a lower anode electrode , a central anode electrode and an upper anode electrode , in the active area (AA) of the substrate , wherein the lower anode electrode is a corrosion preventing layer formed of a transparent conductive material arranged to protect an upper surface of the upper source electrode and a lower surface of the central anode electrode ; an organic light emitting layer on the anode electrode ; a cathode electrode on the organic light emitting layer ; a signal pad on the pad area (PA) of the substrate , wherein the signal pad is in the same layer as the drain electrode and the source electrode of the TFT; a first pad electrode on the signal pad and connected with the signal pad via a contact hole (CH4), wherein the first pad electrode comprises a same material as the anode electrode ; a second pad electrode covering the first pad electrode ; an auxiliary electrode connected with the cathode electrode , the auxiliary electrode including: a first auxiliary electrode provided in a same layer as the anode electrode and horizontally spaced apart from the anode electrode ; and a second auxiliary electrode on the first auxiliary electrode , wherein the second auxiliary electrode is directly connected with the cathode electrode , wherein the second auxiliary electrode covers side surfaces and an upper surface of the first auxiliary electrode , and the second pad electrode covers an upper surface and side surfaces of the first pad electrode . <EOS>