Patent ID: 7564531

Claim:
A liquid crystal display device which includes a first plastic substrate, a second substrate placed opposite to the first substrate and a liquid crystal layer inserted therebetween comprising: a plurality of first wirings in a lower layer side and a plurality of second wirings in an upper layer side extending in a direction perpendicular to each other on said first substrate; a switching element arranged in a vicinity of an intersection between the first and second wirings; and a pixel electrode formed in each pixel region surrounded by the first and second wirings, wherein a first wiring of the plurality of first wirings is formed of a metal layer containing copper embedded in a groove formed within the first plastic substrate and a barrier metal film covering at least a part of surroundings of the metal layer, and wherein the barrier metal film comprises a first barrier metal film arranged on a bottom and a side wall of the groove, and a second barrier metal film arranged on a top of the groove.