Patent ID: 8405091
Filing Date: 2013-03-26
Classification: G02F,H01L

Abstract:
1. A display device comprising: a metal conductive layer formed on a substrate; a transparent electrode film formed on the same substrate, to be joined to said metal conductive layer; and an interlayer insulating film for isolating said metal conductive layer and said transparent conductive film, wherein said metal conductive layer has a lower aluminum layer made of aluminum or an aluminum alloy; an intermediate impurity containing layer made of aluminum or an aluminum alloy containing impurities and formed on a substantially entire upper surface of said lower aluminum layer; and an upper aluminum layer made of aluminum or an aluminum alloy and formed on said intermediate impurity containing layer, a contact hole is so formed as to penetrate through said interlayer insulating film and locally expose said upper aluminum layer, and said transparent electrode film is joined to said metal conductive layer and said upper aluminum layer exposed from said contact hole, wherein: said upper aluminum layer further has a local impurity containing layer made of aluminum or an aluminum alloy containing impurities and so locally formed in said upper aluminum layer as to be connected to said intermediate impurity containing layer, said transparent electrode film is joined to said intermediate impurity containing layer through said local impurity containing layer, and said local impurity containing layer has a thickness which is almost equal to that of the upper aluminum layer.