Patent ID: 7489039

Claim:
A metal fill region of a semiconductor chip comprising: a plurality of layer sets of the semiconductor chip; a first metal fill layer and a second metal fill layer included in each of said plurality of layer sets; an insulation layer included in each of said plurality of layer sets, said insulation layer disposed between said first metal fill layer and said second metal fill layer, wherein said first metal fill layer, said second metal fill layer, and said insulation layer are disposed in planes parallel to each other; a plurality of metal fill pieces disposed in each of said first metal fill layer and said second metal fill layer; a metal fill piece axis of each of said plurality of metal fill pieces disposed in said first metal fill layer and said second metal fill layer, wherein each of said metal fill piece axes perpendicularly intersect said planes of said first metal fill layer, said second metal fill layer, and said insulation layer from any point of reference; and a metal fill pattern configured to position said metal fill pieces so that said metal fill piece axes of each of said metal fill pieces in said first metal fill layer are linearly displaced of said metal fill piece axes of each of said metal fill pieces in said second metal fill layer in at least one direction orthogonal to each of said metal fill axes.