Patent ID: 6509215
Filing Date: 2003-01-21
Classification: H01L

Abstract:
A method of manufacturing a TFT substrate comprising the steps of:forming a gate electrode on a surface of an underlying substrate; forming a first insulating film on the underlying substrate, the first insulating film covering the gate electrode; forming a channel layer on the first insulating film, the channel layer overriding on the gate electrode, and forming a source electrode and a drain electrode on an upper surface of the channel layer, the source and drain electrodes covering areas on both sides of the gate electrode and including a conductive film made of Al or Al alloy and an upper conductive film disposed on the conductive film and made of a material different from Al; forming a second insulating film on the first insulating film, the second insulating film covering the source electrode and the drain electrode; forming a first opening through the second insulating film in an area corresponding to the source electrode and through the upper conductive film of the source electrode, an inner wall of the first opening in the second insulating film being retreated from an inner wall of the first opening in the upper conductive film; and forming an ITO film on an inner surface of the first opening and on a partial surface of the second insulating film.