Patent ID: 6443059
Filing Date: 2002-09-03
Classification: B41M,H01L

Abstract:
A solder screen printing process comprising:providing a wafer that has a plurality of chips formed thereon and a passivation layer that covers the chips, wherein each of the chips has a plurality of bonding pads that has respectively an under bump metal (UBM) structure formed thereon, wherein the under bump metal (UBM) structure is exposed through the passivation layer; forming a pattern layer on the wafer, wherein the pattern layer has a plurality of first through openings formed therein to define a plurality of locations where a plurality of bumps is to be formed; providing a carrier that has a wafer mounting location thereon; providing a mounting support means that is arranged on the carrier, wherein the mounting support means has a second opening of the wafer size that exposes the wafer mounting location of the carrier; mounting the wafer in the second opening of the mounting support means; and performing a solder screen printing by filling a solder paste in the first openings of the pattern layer.