Liquid crystal display device having wiring line including first and second layers with second layer having a thickness not greater than 1/2 of a thickness of first layer

摘要

A liquid crystal display device has good contact characteristics between an etched side end portion of a lower layer wiring line and an insulating film and the like, satisfactory step coverage, and satisfactory adhesion to a substrate so that disconnection of an upper layer wiring line and short-circuiting of the lower layer wiring line can be prevented to improve reliability. The liquid crystal display device comprises a wiring line having a laminated structure including a first layer which is made from a first metal layer formed over an insulating substrate and a second layer which is made from a second metal layer different from the first metal layer and is formed over the first metal layer, and the side end face of the first layer has a right-tapered shape with a taper angle of 60° or less, while the side end face of the second layer is approximately perpendicular to or counter-tapered with respect to the insulating substrate. The second layer has a thickness not greater than ½ of that of the first layer.