Patent ID: 7452257

Claim:
A method for manufacturing a display device having a thin film transistor and a light emitting element, comprising the steps of: forming a first interlayer insulating film including a photosensitive organic material over the thin film transistor; selectively etching the first interlayer insulating film such that an upper edge portion of the first interlayer insulating film has a curved surface; forming a second interlayer insulating film covering the first interlayer insulating film and including at least one selected from the group consisting of a silicon nitride, a silicon oxynitride, and an aluminum oxynitride; forming a contact hole in the first interlayer insulating film and the second interlayer insulating film; forming a first electrode electrically connected to at least one of a source region and a drain region of the thin film transistor through the contact hole; forming an insulating film to cover an edge portion of the first electrode, wherein an upper edge portion of the insulating film has a curved surface; performing a plasma treatment on the first electrode and the insulating film in an atmosphere containing argon and oxygen; forming a layer containing an organic compound over the first electrode and the insulating film; and forming a second electrode over the layer containing the organic compound.