Patent ID: 6740596
Filing Date: 2004-05-25
Classification: G02F,H01L

Abstract:
A manufacturing method of an active matrix substrate comprising the steps of:a film laminated step for depositing a plurality of films to form laminated films on an insulating substrate; a resist pattern formation step for forming a resist pattern having a plurality of film thicknesses on said laminated films; a first etching step for etching said laminated films; using said resist pattern as a first etching mask;a resist etching step for etching said resist pattern to remove a thinner portion of said resist pattern; and a second etching step for etching said laminated films using a remaining portion of said resist pattern left after said resist etching process as a second etching mask, and forming a first conductive film pattern on said insulating substrate before said film lamination step in which an insulation layer, a semiconductor film, an ohmic semiconductor film and a second conductive film are deposited in order covering said first conductive film pattern to form said laminated films, wherein said resist pattern is formed so as to have a first portion of said resist pattern thicker than a second portion and said second portion of said resist pattern with an opening therein, at least top two films of said laminated films in said opening are etched and removed in said first etching step, said resist pattern is etched to remove said second portion in said resist etching step, at least an uppermost film of said laminated films is etched and removed in said second etching step, and after said resist etching step, a contact hole formation step for a remaining films of said laminated films in said opening left is etched and removed to form a contact hole in said insulation layer reaching a surface of said first conductive film pattern.