Patent ID: 7528895

Claim:
A method for manufacturing a lower plate in an image display device, comprising: providing a transparent substrate having a thin film transistors (TFT) area and a storing capacitor area; forming an aluminum metal layer(or an aluminum alloy layer) and a metal protecting layer on the substrate, wherein the aluminum metal layer is located between the metal protecting layer and the transparent substrate; patterning a first pattern on the aluminum metal layer of the TFT area, and a second pattern on the metal protecting layer of the storing capacitor area through a halftone mask; forming an aluminum nitride layer on the patterned metal protecting layer of the storing capacitor area; removing the aluminum nitride layer located on the patterned metal protecting layer of the storing capacitor area to form a rugged surface; forming patterned gates, patterned sources, and patterned drains over the patterned metal protecting layer of the TFT area, and forming a second metal layer over the rugged surface of the aluminum layer on the storing capacitor area, wherein the second metal layer is electrically connected with the drains; and forming patterned pixel electrodes.