Patent ID: 8460986

Claim:
A method of manufacturing an active matrix display device in which a plurality of pixel circuits are formed using a plurality of thin film transistors, each thin film transistor comprising a channel region, each channel region being in a crystalline or an amorphous state, said method comprising the steps of: forming a thin semiconductor film for said channel regions over a substrate; and selectively irradiating a portion of the thin semiconductor film using a laser light such that (i) the thin semiconductor film comprises a first portion that is irradiated and a second portion that is not irradiated (ii) the first portion has a crystallinity that is higher than that of the second portion and (iii) the first portion and second portion are formed in the same selectively irradiating step, wherein, each first portion and each second portion are arranged on the thin semiconductor film such that each first portion is adjacent to a corresponding second portion and each first portion is arranged in the same direction as the scanning direction of the laser light.