Patent ID: 7169710

Claim:
A method of manufacturing a wiring comprising the steps of: forming a first-shaped conductive layer comprising a lamination of a first conductive layer, a second conductive layer, and a third conductive layer on an insulating surface; etching the first conductive layer, the second conductive layer and the third conductive layer to form a second-shaped conductive layer comprising a lamination of the first conductive layer with a first width, a second conductive layer with a second width, and a third conductive layer with a third width; and etching the second conductive layer with the second width and the third conductive layer with the third width to form a third-shaped conductive layer comprising a lamination of a first conductive layer with a fourth width, a second conductive layer with a fifth width, and a third conductive layer with a sixth width, wherein a cross-section of edges of at least one of the first conductive layer, the second conductive layer, and the third conductive layer has a taper shape.