Patent ID: 7223146

Claim:
A manufacturing method of an electroluminescent display device, comprising: disposing a thin film transistor on a substrate; disposing a planarization insulating film made of a photosensitive material over the thin film transistor; performing a half exposure processing and a development processing on the planarization insulating film to form a concave and convex structure on a surface of the planarization insulating film; disposing a mask with an opening portion on the surface of the planarization insulating film with the concave and convex structure; performing a full exposure processing and a development processing on the planarization insulating film using the mask to form a contact hole in the planarization insulating film; disposing an anode connected to a source or a drain of the thin film transistor through the contact hole; disposing an emissive layer over the anode; and disposing a cathode over the emissive layer.