Patent ID: 7045398

Claim:
A method for manufacturing an electro-optical device including a substrate and a semiconductor layer formed on said substrate with an insulating film introduced therebetween, wherein said semiconductor layer is divided into two or more semiconductor regions with different layer thickness, said method comprising: patterning said semiconductor layer according to a predetermined flat shape and dividing said semiconductor layer into the two or more semiconductor regions; forming a side-face passivation layer containing oxidation-resistant material on a partial side face portion of at least one semiconductor region where thin-layer formation is to be performed; and forming a thin-layer of semiconductor layers having substantially coplanar surface to the side-face passivation layer by reducing a thickness of the at least one semiconductor region after forming the side-face passivation layer, to a predetermined semiconductor layer thickness, comprising: forming an oxidized layer on a top face of said semiconductor region by oxidizing the top face of the semiconductor region; and removing the oxidized layer to perform thin-layer formation of said semiconductor region.