Patent ID: 7876038

Claim:
An organic light emitting display, comprising: a substrate; a driving thin film transistor (TFT) on the substrate, the TFT including a semiconductor layer formed of a source electrode, a drain electrode, and an N-type oxide semiconductor; at least one insulating layer formed on the driving TFT; a pixel defining layer defining a pixel region on the insulating layer; a cathode electrode coupled to a drain electrode of the driving TFT and patterned to correspond to the pixel region; an electron injection layer arranged on the cathode electrode over the entire surfaces of the pixel defining layer and the cathode electrode, and formed of a material whose band gaps are 3.4 eV to 5.0 eV selected from the group consisting of an oxide, a nitride, a fluoride, and diamond; an organic light emitting layer formed on the electron injection layer to correspond to the cathode region; and an anode electrode formed on the organic light emitting layer.