Patent ID: 7830463

Claim:
A liquid crystal display device, comprising: a first transparent insulating substrate having a main surface which comprises an active area, a pixel-electrode-forming-region in the active area, and a plurality of electrode-terminal-forming-regions outside the active area; a gate electrode and at least a gate wire formed on the main surface of the first transparent insulating substrate, wherein the gate wire has an electrode-terminal disposed in one electrode-terminal-forming-region, and the gate wire is disposed in the pixel-electrode-forming-region; a gate insulating layer formed over the main surface of the first transparent insulating substrate; a semiconductor layer, having a channel, formed on the gate insulating layer above the gate electrode; a source wire and a drain wire, formed on the semiconductor layer, comprising a low-resistance metal layer and a heat-resistant metal layer which is selectively removed by an etching gas for etching the gate insulating layer, wherein in the drain wire, part of the heat-resistant metal layer is covered by the low-resistance metal layer and part of the heat-resistant metal layer is covered by a pixel electrode; an electrode-terminal disposed in another electrode-terminal-forming-region, formed on the gate insulating layer and electrically connected to the source wire; a protective layer, comprising a passivation insulating layer, a protective insulating layer, a photosensitive organic insulating layer, or the combination thereof, disposed over the main surface of the first transparent insulating substrate; a plurality of openings formed in the pixel-electrode-forming-region and the electrode-terminal-forming-regions, wherein part of the drain wire formed by the heat-resistant metal layer, part of the first transparent insulating substrate, part of the gate wire, and part of the electrode-terminal are exposed in the openings; a pixel unit comprising the pixel electrode formed in the pixel-electrode-forming-region, wherein the pixel electrode is connecting to the drain wire; a second transparent insulating substrate opposed to the first transparent insulating substrate; and a liquid crystal layer disposed between the first transparent insulating substrate and the second transparent insulating substrate; wherein the pixel electrode, the electrode-terminal of the gate wire, and the electrode-terminal of the second source wire are made of the same conductive film.