US Patent 7655501 Wafer level package with good CTE performance

The present invention provides a structure of package comprising a substrate with a pre-formed die receiving cavity formed and/or terminal contact metal pads formed within an upper surface of the substrate. A die is disposed within the die receiving cavity by adhesion and a dielectric layer formed on the die and the substrate. At least one re-distribution built up layer (RDL) is formed on the dielectric layer and coupled to the die via contact pad. Connecting structure, for example, UBM is formed over the re-distribution built up layer. Terminal Conductive bumps are coupled to the UBM.