US Patent 10204852 Circuit substrate and semiconductor package structure

A circuit substrate for a chip bonding thereon includes a core substrate having a chip-side surface and a bump-side surface opposite to the chip-side surface, a first through via plug passing through the core substrate, a pad disposed on the bump-side surface, in contact with the first through via plug, and a first thickness enhancing conductive pattern disposed on a surface of the pad, which is away from the bump-side surface.