Patent ID: 8096847

Claim:
A method of forming an organic light emitting device having R, G, B unit pixels, in which the R, G, B unit pixels comprise R, G, B lower electrodes formed on a substrate, R, G, B organic thin film layers each formed on the R, G, B lower electrodes, and an upper electrode formed over the substrate, the method comprising the steps of: forming the upper electrode, the upper electrode being formed by: forming a first upper electrode material on the substrate; and forming a second upper electrode material on the first upper electrode material, the second upper electrode material having portions, each portion having a different thickness that corresponds to one of the R, G, B unit pixels, wherein forming the second upper electrode material includes: forming on portions of the first upper electrode material that corresponds to the R, G, B organic thin film layers, one or more first layers, each of the first layers having a different thickness that corresponds to one of the R, G, B unit pixels, respectively; and forming a second layer in a uniform thickness on the first layer and the first upper is electrode material.