Patent ID: 6476447
Filing Date: 2002-11-05
Classification: G02F,G09G,H01L,Y10S

Abstract:
An active matrix display device comprising:a substrate having an insulating surface; an active matrix circuit over said substrate, said active matrix circuit comprising: at least one thin film transistor having source and drain regions and a channel region therebetween in a semiconductor layer, and a gate electrode adjacent to said channel region with a gate insulating film interposed therebetween; a pixel electrode formed over said substrate and electrically connected to one of said source and drain regions; a capacitor formed between a metal containing layer and a portion of said pixel electrode with a first oxide layer interposed therebetween, said first oxide layer comprising an oxidized surface of said metal containing layer, and a CMOS circuit for driving said active matrix circuit formed over said substrate, said CMOS circuit comprising at least a pair of N-channel and P-channel thin film transistors; a first wiring formed over said substrate; a second oxide layer formed on said first wiring; a contact hole formed in said second oxide layer in which a contact portion of said first wiring is exposed; and a second wiring formed over said second oxide layer, wherein said second wiring is connected to said first wiring through said contact hole, wherein said second wiring is connected to said pair of N-channel and P-channel thin film transistors, and wherein a width of an upper portion of said contact hole is larger than that of a lower portion of said contact hole.