PACKAGE SUBSTRATE, PACKAGE STRUCTURE AND FABRICATION METHOD THEREOF
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United States of America Patent
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Issued Date -
May 5, 2016
app pub date -
Aug 27, 2015
filing date -
Nov 3, 2014
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Abstract
A package substrate is provided, which includes: a body having opposite first and second surfaces, each having adjacent first and second regions defined thereon; first and second circuit layers formed on the first and second surfaces of the body, respectively; a first insulating layer formed on the first surface of the body and having a plurality of first openings formed in the first insulating layer and positioned in the first and second regions; and a second insulating layer formed on the second surface of the body and having a plurality of second openings formed in the second insulating layer and positioned in the second region. Further, at least a third opening is formed in the second insulating layer and positioned in the first region to reduce the volume of the second insulating layer, thereby facilitating even distribution of thermal stresses through the first and second insulating layers during thermal cycling and hence preventing warpage of the package substrate.
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