Patent ID: 7443457

Claim:
A method of fabricating an array substrate for a liquid crystal display (LCD) device, comprising: forming at least an alignment key on a substrate, the substrate having a first region and a second region, wherein the alignment key is substantially located in the second region; forming an amorphous silicon layer on the alignment key; crystallizing a predetermined portion of the amorphous silicon layer using the alignment key as a reference; patterning the amorphous silicon layer using the alignment key as a reference to form a polycrystalline silicon layer, wherein the polycrystalline silicon layer is formed from the predetermined portion of the amorphous silicon layer; forming a gate insulating layer on the polycrystalline silicon layer; forming a gate electrode on the gate insulating layer using the alignment key as a reference; forming an interlayer insulating layer on the gate electrode; and forming source and drain electrodes on the interlayer insulating layer.