Patent ID: 6778232
Filing Date: 2004-08-17
Classification: G02F,H01L

Abstract:
A method for manufacturing an active matrix substrate comprising the steps of:forming a thin film transistor and a wiring on a transparent insulating substrate; forming a protective film covering said thin film transistor and said wiring on said transparent insulating substrate; forming a first photosensitive film on said protective film exposed therefrom, said first photosensitive film having a first opening to expose a portion of a first region of said protective film; forming a second photosensitive film on said first photosensitive film with a second opening positioned inside said first opening to expose a part of said protective film; forming a third opening in said protective film by removing said part of said protective film to expose a portion of said wiring by using said second photosensitive film as a mask such that an edge of said third opening is apart by a distance equal to at least a film thickness of said second photosensitive film from an inner wall of said first opening; removing said second photosensitive film to expose said first photosensitive film; forming a conductive film on said first photosensitive film so as to be connected to said wiring through said third opening; and forming a pattern in said conductive film to form an upper layer wiring made of said conductive film.