Patent ID: 7719626
Filing Date: 2010-05-18
Classification: G02F,H01L

Abstract:
1. A liquid crystal display device, comprising: a pair of substrates; liquid crystals put between the pair of substrates; a plurality of scanning signal lines formed on one of the pair of substrates; a plurality of image signal lines crossing the scanning signal lines in a matrix form; thin film transistors formed corresponding to intersections between the scanning signal lines and the image signal lines; pixel electrodes connected to the thin film transistors; a gate insulative film covering the scanning signal lines; and a protection insulative film covering the image signal lines and the thin film transistors; wherein the scanning signal line includes a multi-layer film including a copper alloy film formed on a transparent conductive film comprising an indium oxide as a main ingredient, and a metal oxide film of an additive metal element of the copper alloy formed between the transparent conductive film and the copper alloy film, the diffusion coefficient of the additive metal element of the copper alloy in copper being higher than the self-diffusion coefficient of copper, the chemical potential of oxygen gas at equilibrium of oxidation of the additive metal element of the copper alloy being lower than the chemical potential of oxygen gas at equilibrium of oxidation of indium, and the solid solubility of the additive metal element of the copper alloy in copper being greater than 0.1%.