Patent ID: 7232716
Filing Date: 2007-06-19
Classification: G02F,H01L

Abstract:
1. A method of producing display devices, comprising: a first step of forming an amorphous semiconductor film on a substrate entirely; a second step of irradiating the amorphous semiconductor film with a laser beam so as to polycrystallize the amorphous semiconductor film into a polycrystalline film; and a third step of measuring grain sizes of said polycrystalline film, at each of a plurality of measurement points set in a plane of the polycrystalline film in an identical order for said substrate and any subsequent substrates, said measurement points are set in a region A located at a center of the substrate, a region B located at a corner of the substrate, and a region C located around the region A so as to space the region B from the region A, respectively, wherein an energy density of a laser beam with which a subsequent substrate is irradiated during the second step is adjusted (1) to be lower than an energy density of the laser beam with which the substrate is irradiated, if a grain size measured in the region A of the substrate is larger than a grain size measured in the region B thereof; (2) to be higher than the energy density of the laser beam with which the substrate is irradiated, if the grain size measured in the region A of the substrate is smaller than the grain size measured in the region B thereof; or (3) to be identical with the energy density of the laser beam with which the substrate is irradiated, if the grain size measured in the region A of the substrate has the same value as that measured in the region B thereof.