Patent ID: 8158969

Claim:
An organic light emitting display device comprising: a substrate; an organic light emitting layer; and an anode and a cathode; wherein the anode and the organic light emitting layer are arranged between the substrate and the cathode; wherein the anode is arranged between the substrate and the organic light emitting layer; the cathode is a transparent electrode formed of material including oxides having indium-oxide as a main raw material; a light emitted from the organic light emitting layer is taken out from the transparent cathode side; an organic layer comprising an electron injection layer or an electron transport layer, which is mainly composed of an organic material having a heterocyclic group containing one or more nitrogen atoms, is included between the organic light emitting layer and the cathode; and a buffer layer consisting of vanadium oxide, tungstic oxide or molybdenum oxide, which is included between the organic layer and the cathode, with the cathode directly on the buffer layer.