Patent ID: 7176535
Filing Date: 2007-02-13
Classification: G02F,H01L

Abstract:
1. A method of forming a TFT array substrate for use in a liquid crystal display device, comprising: forming a first metal layer over a substrate; forming a second metal layer on the first metal layer; patterning the first and second metal layers so as to form a gate line and a gate electrode; thermally-treating the substrate having the patterned first and second metal layers so as to diffuse material from the patterned first metal layer over the patterned second metal layer and then to form a metallic oxide layer surrounding the second metal layer by oxidizing the diffused material of the first metal layer; forming a gate insulation layer on the substrate, the gate line and the metallic oxide layer; forming an amorphous silicon layer on the gate insulation layer; forming an impurity-doped amorphous silicon layer on the amorphous silicon layer; forming a third metal layer on the impurity-doped amorphous silicon layer; patterning the third metal layer so as to form a data line, a source electrode and a drain electrode; patterning the impurity-included amorphous silicon layer using the patterned third metal layer as masks so as to form an ohmic contact layer and a channel region in the amorphous silicon layer between the source and drain electrodes; forming a protection layer on the amorphous silicon layer and on the patterned third metal layer; patterning the protection layer, the amorphous silicon layer and the gate insulation layer except portions that correspond to the patterned third metal layer and channel region; depositing a transparent conductive material in a pixel region that is defined by the gate and data lines; and patterning the transparent conductive material so as to form a pixel electrode that contacts the drain electrode.