Patent ID: 8110748

Claim:
An active matrix type display comprising: a flat glass substrate; a plurality of scanning lines; a plurality of signal lines; and thin film transistors arranged to form a matrix, wherein each of the scanning lines includes: a silicon nitride layer provided on the glass substrate; a first copper diffusion-preventing layer provided on the silicon nitride layer; a copper seed layer provided on the first copper diffusion-preventing layer, side and top surfaces thereof being exposed from the first copper diffusion-preventing layer; a copper layer plated on the top surface of the copper seed layer, the copper layer having a tapered cross section and side and top surfaces thereof being exposed from the first copper diffusion-preventing layer; and a second copper diffusion preventing layer covering the side surfaces of the copper seed layer and the copper layer, and the top surface of the copper layer, side walls of the second copper diffusion preventing layer that cover the side surfaces not extending laterally outwards from the copper layer on the flat glass substrate.