Patent ID: 7465654

Claim:
A method for fabricating a chip-on-glass assembly for an LCD driver IC die, comprising: providing a wafer with a semiconductor substrate, a transistor in and on said semiconductor substrate, a first metal layer over said semiconductor substrate, a second metal layer over said semiconductor substrate and over said first metal layer, a dielectric layer between said first and second metal layers, a passivation layer over said semiconductor substrate, over said first and second metal layers and over said dielectric layer, wherein said passivation layer comprises a nitride layer having a thickness between 0.2 and 1.2 micrometers, and a contact pad over said semiconductor substrate, wherein said contact pad is exposed by an opening in said passivation layer; sputtering a titanium-containing layer over said wafer, wherein said titanium-containing layer has a thickness between 1,000 and 10,000 Angstroms; sputtering a first gold layer on said titanium-containing layer; depositing a first photoresist layer on said first gold layer, wherein an opening in said first photoresist layer is over said first gold layer and exposes said first gold layer; electroplating a second gold layer on said first gold layer exposed by said opening in said first photoresist layer, wherein said second gold layer has a thickness between 2 and 30 micrometers; removing said first photoresist layer; after said removing said first photoresist layer, depositing a second photoresist layer directly on said first and second gold layers, wherein an opening in said second photoresist layer is over said second gold layer and exposes said second gold layer; electroplating a gold bump directly on said second gold layer exposed by said opening in said second photoresist layer, wherein said gold bump has a thickness between 7 and 100 micrometers and smaller than a thickness of said second photoresist layer; after said electroplating said gold bump, removing said second photoresist layer; after said removing said second photoresist layer, removing said titanium-containing layer and said first gold layer not under said second gold layer; and connecting said gold bump to a glass substrate.