Patent ID: 7022558

Claim:
A method of manufacturing an active matrix substrate, wherein a laser beam is repeatedly exposed to a semiconductor film formed on a dielectric substrate of an active matrix substrate to produce a polycrystallized semiconductor film, comprising: intensity modulating said laser beam; directing and shaping said laser beam to be periodic in at least one direction: and moving randomly the intensity distribution of the laser beam on said semiconductor film in the periodic direction of said intensity modulation, wherein a coordinate y on said semiconductor film in the periodic direction of said intensity modulation at the point where the laser beam intensity becomes a maximum at the time of said laser beam exposure, is given by y=na+r where a designates a periodicity of intensity modulation of said laser beam, n designates an integer, r designates a non-negative value smaller than a and which is determined for each exposure, and in which the difference between the maximum and minimum values of said r is a half or more of periodicity.