Patent ID: 9565774
Date: 2017-02-07
CPC Classifications: H05K

Claim:
1. A method of forming an embedded trace substrate comprising: forming a first conductive layer on a carrier; patterning the first conductive layer to provide a conductive bump pattern having first portions defining a plurality of bump pads and second portions extending laterally between each bump pad, wherein the second portions have a thickness that is thinner than the first portions; thereafter forming a dielectric film adjacent the conductive bump pattern; forming a plurality of vias in the dielectric film extending to the conductive bump pattern; forming a conductive pattern on the dielectric film electrically coupled to the conductive bump pattern through the vias, wherein conductive pattern protrudes outwardly from the dielectric film, and wherein portions of the dielectric film are exposed in the conductive pattern; thereafter removing the carrier; and thereafter selectively removing the second portions of the conductive bump pattern to form the plurality of bump pads, each bump pad protruding outwardly from the dielectric film by a predetermined height, and wherein a portion of each bump pad remains embedded within the dielectric film to provide the embedded trace substrate.