US Patent 9214437 Package method

A package method comprises the steps of: providing a metal carrier having a first surface and a second surface opposite to the first surface; forming a first wiring layer on the second surface of the metal carrier; forming a first conductive pillar layer on the first wiring layer; forming a dielectric material layer covering the first wiring layer, the first conductive pillar layer and the second surface of the metal carrier; exposing one end of the first conductive pillar layer; forming a second wiring layer on the exposed end of the first conductive pillar layer; forming a solder resist layer on the dielectric material layer and the second wiring layer; removing the metal carrier.