Patent ID: 7642701

Claim:
An organic EL display device comprising: a substrate; a plurality of pixel regions each of which includes at least a first electrode, a light emitting material layer, and a second electrode laminated in this order above a principal surface of the substrate, wherein the plurality of pixel regions are arranged two-dimensionally in the principal surface of the substrate; and a bank film formed above the principal surface of the substrate to separate respective ones of the plurality of pixel regions from others of the plurality of pixel regions adjacent to the respective one of the plurality of pixel regions, the bank film including openings, each of which exposes the first electrode provided for the respective one of the plurality of pixel regions, wherein the light emitting material layer is formed in the opening of the bank film to be extended to a side wall of the bank film lying along the opening in the respective one of the plurality of pixel regions, the second electrode provided for the respective one of the plurality of pixel regions is formed in common with that provided for the other of the plurality of pixel regions, and the bank film is comprised of two inorganic material films; wherein the inorganic material films are formed of a silicon nitride or a silicon oxide, wherein a composition ratio of silicon of the upper films in the inorganic material films is richer than a composition ratio of the lower films, wherein a thickness of the upper film is smaller than a thickness of the lower films, and wherein the side wall of the bank film is inclined with an angle of less than 85 degrees.