Patent ID: 8310069

Claim:
An apparatus comprising: a substrate: a packaged semiconductor device having a semiconductor chip connected to the substrate by a plurality of bonding wires, the bonding wires having arches including tops; a package material, which encapsulates the semiconductor chip, the plurality of bonding wire arches, and a surface of the substrate, and forms a flat surface of the packaged semiconductor device; and a polymer sheet attached to the packaged semiconductor device flat surface, the polymer sheet having a bare surface, the polymer sheet including first regions having a first optical reflectivity and second regions having a second optical reflectivity; wherein the second reflectivity differs from and contrasts with the first reflectivity, wherein the second regions have undergone a molecular disturbance without addition or loss of any material from the polymer sheet to create the second regions; wherein the tops of the plurality of bonding wire arches touch the packaged semiconductor device flat surface bordering on the attached sheet.