Patent ID: 9159614
Filing Date: 2015-10-13
Classification: H01L

Abstract:
1. A packaging substrate, comprising: a first wiring layer; a first dielectric layer formed on the first wiring layer; a second wiring layer formed on the first dielectric layer; a plurality of copper pillar bumps, each copper pillar bump comprising a base portion and a protruding portion; the base portion connected to the first wiring layer and portions of the first wiring layer exposed from the base portion, the protruding portion formed on the base portion; and a first conductive layer formed on surfaces of the first wiring layer exposed from the base portion, and formed on surfaces of the base portion away from the first wiring layer, and formed on side surfaces of the base portion; wherein a size of the protruding portion is less than a size of the base portion, and a size of the copper pillar bumps gradually increases from the protruding portion to the base portion.