Patent ID: 6936844

Claim:
A semiconductor device having a pixel section and a driver circuit over a substrate, said semiconductor device comprising: an n-channel TFT of said driver circuit having at least one LDD region that a portion of, or all of said LDD region overlaps a gate electrode of said n-channel TFT of said driver circuit with a gate insulating film interposed therebetween; at least a first and a second thin film transistors in said pixel section, each of said first and said second thin film transistors comprising a semiconductor film having a channel region and source and drain regions, a gate insulating film formed on said semiconductor film and a gate electrode on said gate insulating film wherein said at least one of said first and said second thin film transistors has a LDD region not overlapped with said gate electrode with said gate insulating film interposed therebetween; a gate wiring comprising at least a first wiring comprising a material selected from the group consisting of tantalum, titanium, molybdenum, tungsten, chromium, niobium or silicon formed on the gate insulating film and a second wiring formed on the first wiring comprising a material selected from the group consisting of aluminum, copper or silver; an insulating film formed over said gate wiring; and source and drain wirings formed over said insulating film and connected to said source and drain regions respectively, wherein a portion of said first wiring extends over said semiconductor film to function as said gate electrode while said gate electrode does not include any portion of said second wiring; and wherein said second wiring has a lower resistivity than that of said first wiring.