Patent ID: 8779582

Claim:
An integrated circuit chip package, comprising: a substrate; a chip attached to the substrate; and a heat spreader mounted over the chip for sealing the chip therein, the heat spreader comprising: a passive, thermally-conductive element having a side opposed to a top surface of the chip for transmitting heat away from the chip to the heat spreader, the thermally-conductive element comprising two horizontally distinct, thermally-conductive areas, positioned side by side in a direction parallel to the top surface of the chip, having different thermal conductivity, the thermally-conductive areas comprising different metals, wherein each horizontally distinct, thermally-conductive area of the two horizontally distinct, thermally-conductive areas comprises a single metal; a compliant element having a first portion attached to and positioned around a periphery of the thermally-conductive element and a second portion affixed to a surface of the substrate by a stiffener, wherein the thermally-conductive element has thermal conductivity higher than that of the compliant element, and wherein a surface of the compliant element closest to the top surface of the chip and a surface of the thermally-conductive element closest to the top surface of the chip are substantially coplanar where the first portion of the compliant element meets the periphery of the thermally-conductive element.