Patent ID: 7956472

Claim:
A packaging substrate having electrical connection structures, comprising: a substrate body having a plurality of conductive pads on a surface thereof; a solder mask layer disposed on the surface of the substrate body and formed with a plurality of openings corresponding in position to the conductive pads, each of the openings being larger in size than each of the conductive pads; copper bumps disposed on the conductive pads for fully covering the conductive pads exposed from the openings, and the copper bumps protrude above the solder mask layer, each of the openings is larger in size than each of the copper bumps; electroplated solder bumps mounted on the copper bumps for fully covering the copper humps exposed from the openings, wherein the electroplated solder bumps fill the openings: and a conductive seed-layer formed between the conductive pads and the copper bumps.