Patent ID: 8133770

Claim:
A method for manufacturing an active matrix display comprising: forming a first insulating film over a glass substrate; forming a semiconductor film over the first insulating film; disposing a catalyst in a region of the semiconductor film, wherein the catalyst is capable of promoting crystallization of the semiconductor film; crystallizing the semiconductor film, wherein crystals of the semiconductor film grow from the region; patterning the crystallized semiconductor film to form a semiconductor island having a source region, a drain region and a channel region; forming a second insulating film covering the semiconductor island; forming a gate electrode over a portion of the semiconductor island with the second insulating film interposed therebetween; forming a third insulating film covering the gate electrode and the second insulating film; forming a contact hole in the third insulating film reaching the source region and the drain region of the semiconductor island; and forming a wiring over the third insulating film, wherein the width of the crystals is 0.5 to 3 times the thickness of the semiconductor film.