Patent ID: 7632694

Claim:
A manufacturing method for a TFT electrode which is implemented to prevent metal ion diffusion to an adjacent insulating layer during fabrication, the method comprising, in the order recited: a. providing a substrate; b. forming a first metal layer on the substrate which is comprised of one of a single metal layer structure comprising of one of Cr, Cu, Al—Nd, Mo, MoW or Al, or a multiple metal layer structure comprising of one of Ti/Al/Ti, Ti/Al—Nd /Ti, Ti/Al/TiN, Ti/Al—Nd/TiN, Ti/Cu/Ti, Cr/Cu/Cr, W/Cu/W, MoN/Al/MoN, Mo/Al—Nd, MoN/Al—Nd, Mo/Al—Nd/Mo, Ta/Cu/Ta, TaN/Cu/TaN, TiN/Cu/TiN, Ti/Al, Mo/Cu/Mo, or Mo/Al/Mo; c. performing an etching process on the first metal layer to form a gate electrode of the TFT electrode; d. forming a transparent conducting electrode on the first metal layer to cover at least the gate electrode and prevent metal ion diffusion during fabrication, the transparent conducting electrode being comprised of one of indium tin oxide, indium zinc oxide, ZnO or an organic material; e. forming a pixel electrode which functions as a barrier to prevent metal ion diffusion during fabrication by performing another etching process on the transparent conducting electrode; and f. forming a dielectric layer on the transparent conducting electrode to cover the transparent conducting electrode; g. forming an amorphous silicon layer on the transparent conducting electrode; h. forming an N+ amorphous silicon layer on or within the amorphous silicon layer; i. forming a second metal layer on the N+ amorphous silicon layer, and performing another etching process to form a source and a drain of the TFT electrode; and j. forming a passivation layer on the second metal layer, and performing another etching process to define a protective layer of the TFT electrode over at least the source and drain.