An organic light emitting display device comprising: a thin film transistor, TFT, provided on a substrate; a planarization layer disposed on the TFT and planarizing an upper surface of the substrate; an organic light emitting diode, OLED, including an anode electrode on the planarization layer and connected to the TFT, an organic light emitting layer on the anode electrode and a cathode electrode on the organic light emitting layer; and a bank formed on the anode electrode; wherein the planarization layer comprises a first area, a second area, the first area having a first thickness smaller than a second thickness of the second area, and a third area between the first area and the second area, the third area having a thickness increasing from the first thickness to the second thickness, for forming a cavity, and wherein the OLED is arranged on the first area of the planarization layer; wherein the anode electrode is provided on the first area and the third area, and has a step height having a shape corresponding to a step height of the planarization layer; and wherein the bank is provided in the second area and exposing the first area; wherein the bank is disposed on the anode electrode in the third area, and the organic light emitting layer and the cathode electrode are disposed on the bank in the third area; wherein the anode electrode includes a reflective material; wherein the third area of the planarization layer is provided outside an emissive area where the organic light emitting layer is directly provided on the upper surface of the anode electrode; and wherein the anode electrode includes a bottom anode electrode, a center anode electrode, and a top anode electrode, and wherein the material of the center anode electrode has better reflectivity and lower resistance than the material of the bottom anode electrode and the material of the top anode electrode, and wherein the material of the bottom anode electrode and the material of the top anode electrode have stronger corrosion resistance than the material of the center anode electrode, and wherein the center anode electrode is thicker than each of the bottom anode electrode and the top anode electrode. a thin film transistor, TFT, provided on a substrate; a planarization layer disposed on the TFT and planarizing an upper surface of the substrate; an organic light emitting diode, OLED, including an anode electrode on the planarization layer and connected to the TFT, an organic light emitting layer on the anode electrode and a cathode electrode on the organic light emitting layer; and a bank formed on the anode electrode; wherein the planarization layer comprises a first area, a second area, the first area having a first thickness smaller than a second thickness of the second area, and a third area between the first area and the second area, the third area having a thickness increasing from the first thickness to the second thickness, for forming a cavity, and wherein the OLED is arranged on the first area of the planarization layer; wherein the anode electrode is provided on the first area and the third area, and has a step height having a shape corresponding to a step height of the planarization layer; and wherein the bank is provided in the second area and exposing the first area; wherein the bank is disposed on the anode electrode in the third area, and the organic light emitting layer and the cathode electrode are disposed on the bank in the third area; wherein the anode electrode includes a reflective material; wherein the third area of the planarization layer is provided outside an emissive area where the organic light emitting layer is directly provided on the upper surface of the anode electrode; and wherein the anode electrode includes a bottom anode electrode, a center anode electrode, and a top anode electrode, and wherein the material of the center anode electrode has better reflectivity and lower resistance than the material of the bottom anode electrode and the material of the top anode electrode, and wherein the material of the bottom anode electrode and the material of the top anode electrode have stronger corrosion resistance than the material of the center anode electrode, and wherein the center anode electrode is thicker than each of the bottom anode electrode and the top anode electrode.