Patent ID: 8339553

Claim:
A method for fabricating a liquid crystal on silicon display device, the method comprising: providing a substrate; forming a transistor layer overlying the substrate; forming an interlayer dielectric layer overlying the transistor layer; forming a first conductive layer overlying the interlayer dielectric layer; forming a second interlayer dielectric layer overlying the first conductive layer; forming an enlarged opening for a bonding pad structure in a first portion of the second interlayer dielectric layer and at least one plug opening in a second portion of the second interlayer dielectric layer using a dual damascene structure within the second interlayer dielectric layer; simultaneously depositing a barrier metal layer within the enlarged opening and within the one plug opening to form a liner that covers exposed regions of the enlarged opening and the one plug opening; simultaneously depositing metal material onto the liner to fill the enlarged opening and fill the one plug opening with the metal material; forming a thickness of aluminum material overlying the metal material; and patterning the thickness of aluminum material to form a bonding pad structure coupled to the metal material in the enlarged opening and a pixel electrode on the metal material in the one plug opening; whereupon the bonding pad structure has a substantially similar surface area as a surface area of the metal material in the enlarged opening in the second interlayer dielectric layer.