Patent ID: 6316787
Filing Date: 2001-11-13
Classification: G02F,H01L

Abstract:
A semiconductor device having a driving circuit and an active matrix circuit, said driving circuit comprising:a logic circuit having at least a first thin film transistor formed over a substrate, said first thin film transistor having a first gate insulating film and a first gate electrode;a buffer circuit having at least a second thin film transistor formed over said substrate, said second thin film transistor having a second gate insulating film and a second gate electrode; anda high withstand voltage switching circuit having at least a third thin film transistor formed over said substrate, said third thin film transistor having a third gate insulating film and a third gate electrode,wherein each width of said second and third gate electrodes is larger than the width of said first gate electrode,wherein a thickness of said first gate insulating film is 80% or less of each thickness of said second and third gate insulating films.