Patent ID: 7423343
Filing Date: 2008-09-09
Classification: H01L

Abstract:
1. A wiring board comprising: a transistor formed over a substrate having an insulating surface; a first interlayer insulating film formed over the transistor; a first wiring formed over the first interlayer insulating film; a second interlayer insulating film formed over the first wiring; a second wiring formed over the second interlayer insulating film; a first contact hole formed in the first interlayer insulating film so as to connect the first wiring to one of a source and a drain of the transistor; and a second contact hole formed in the second interlayer insulating film so as to connect the second wiring to the first wiring, wherein the second wiring is wider than the first wiring; and wherein the second contact hole has a larger diameter than the first contact hole.