US Patent 7727808 Ultra thin die electronic package

A method for forming an ultra thin die electronic package includes disposing a first polymer film on a first substrate, applying a first adhesive layer to the first polymer film, disposing at least one die on the first adhesive layer, disposing a second polymer film on at least one additional substrate, applying a second adhesive layer to the second polymer film on at least one additional substrate, applying a second adhesive layer to the second polymer film, and attaching the first substrate and the at least one additional substrate via the first adhesive layer and the second adhesive layer such that the at least one die is interspersed between. The method also includes forming multiple vias on a top and/or bottom side of the first and the additional substrate(s), wherein the multiple vias are directly connected to the die, and forming an electrical interconnection between the first substrate, the at least one additional substrate and a die pad of the at least one die.