Patent ID: 8120038

Claim:
An electronic device, comprising: a substrate; and a plurality of thin film transistors disposed in lines at least in one direction in terms of planar view when viewed from one principal surface of said substrate, each of said plurality of thin film transistors including (a) a preliminary heating layer on said substrate, (b) an insulating layer on said preliminary heating layer, and (c) a thin film semiconductor layer, a part of which overlaps said preliminary heating layer through said insulating film, wherein, a portion of said preliminary heating layer other than the portion overlapping said thin film semiconductor layer has a planar shape which is line-symmetrical with respect to an axis extending in a direction perpendicularly intersecting the one direction, said preliminary heating layer has a first region overlapping said thin film semiconductor layer, and a second region other than said first region, and said second region has a planar shape having a line-symmetrical axis passing through a center of said first region.