| 摘要 |
Disclosed is a liquid crystal display device having a signal line of low electrical resistivity and high adhesion with an underlayer, wherein a copper alloy film is formed on an underlayer, and an oxide film, silicide film or nitride film, which are additive metal elements of the copper alloy, is formed at the boundary between the underlayer and the copper alloy film whereby the signal line is formed with a multi-layer film of the copper alloy film and the oxide film, the silicide film, or the nitride film.
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