Patent ID: 7947987

Claim:
An organic light emitting display comprising: a transistor on a substrate; a cathode electrode that is positioned on the transistor to be connected to a source or a drain of the transistor; a bank layer having an opening on the cathode electrode; a natural oxide layer formed on the cathode electrode, wherein the natural oxide layer is removed by performing in an atmosphere of a transformer coupled plasma chamber (TCP) to which a pressure of 2 to 10 mTorr, an Ar injection amount of 10 to 50 sccm, a chamber power of 300 to 1000 W, and a bias power of 100 to 300 W are applied; an insulating buffer layer on the cathode electrode, wherein the insulating buffer layer is formed of aluminum nitride (AlNx) or aluminumoxide (AlO X ); an organic light emitting layer on the insulating buffer layer; and an anode electrode on the organic light emitting layer.