Patent ID: 7417693

Claim:
A liquid crystal display device in which liquid crystal is filled between a first transparent insulating substrate (active substrate) and a second transparent insulating substrate or a color filter, said second transparent insulating substrate or color filter opposing said first transparent insulating substrate, wherein said first transparent insulating substrate has at least one unit pixel having at least one insulating gate-type transistor, a scan line doubling as a gate electrode and a signal line doubling as a source wire of said insulating gate-type transistor, and a pixel electrode connected to a drain wire on a main surface arranged in a two-dimensional matrix, comprising: a scan line and another scan line, each comprising a laminate of a transparent conductive layer and a first metal layer, and a transparent conductive pixel electrode, both formed on a main surface of the first transparent insulating substrate; a first semiconductor layer including no impurities formed in an island shape wider than the gate electrode through a plasma protecting layer and a gate insulating layer above the gate electrode; a pair of second semiconductor layers including impurities and composing source-drain for an insulating the gate transistor formed on said first semiconductor layer such that a part of said second semiconductor layers overlaps the gate electrode and another part of the second semiconductor layers overlaps a part of the another scan line to form a capacitor; an opening formed in the plasma protecting layer and the gate insulating layer on said pixel electrode, on part of the scan line, to expose said pixel electrode and transparent conductive layer forming part of the scan line; a signal line and another signal line formed on said second semiconductor layer and on the gate insulating layer, and a drain wire formed on the second semiconductor layer, on the gate insulating layer and on part of the pixel electrode, both comprising a second anodizable metal layer of one or more metal layers including a heat resistant metal layer, and an electrode terminal for the signal line composing part of the signal line formed outside an image display region, wherein the another part of the second semiconductor layers does not overlap the another signal line; an anodized layer formed on the source-drain wire except on the electrode terminal for said signal line; and an oxide layer formed on the first semiconductor layer between the source-drain wire.