Patent ID: 8704369

Claim:
A flip chip bump structure comprising: a dielectric layer; a trace coupled to the dielectric layer; a patterned buildup layer on a first surface of the dielectric layer, the patterned buildup layer comprising a patterned buildup layer opening exposing a portion of the trace, the portion of the trace exposed within the patterned buildup layer opening having a uniform width, a diameter of the patterned buildup layer opening being greater than the uniform width of the portion of the trace exposed within the patterned buildup layer opening; a portion of a conductor layer remaining in the patterned buildup layer opening and directly contacting the portion of the trace exposed within the patterned buildup layer opening and a flip chip bump in the patterned buildup layer opening, the flip chip bump extending horizontally outward from the patterned buildup layer opening over the patterned buildup layer.