Patent ID: 7863064

Claim:
A method of manufacturing an organic light emitting display comprising: forming a transistor on a substrate; forming a cathode electrode on the transistor to be connected to a source or a drain of the transistor; forming a bank layer having an opening on the cathode electrode; allowing a natural oxide layer to form on the cathode electrode; removing the natural oxide layer from the cathode electrode, wherein removing the natural oxide layer is performed 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; forming an insulating buffer layer on the cathode electrode; forming an organic light emitting layer on the insulating buffer layer; and forming an anode electrode on the organic light emitting layer.