Patent ID: 7510947
Filing Date: 2009-03-31
Classification: B81C,H01L

Abstract:
1. A method for wafer level packaging comprising steps of: providing a cap wafer; forming a patterned film on a surface of the cap wafer and forming a plurality of openings penetrating the cap wafer; bonding the cap wafer to a transparent wafer at the surface having the patterned film, wherein the patterned film is not bonded to the transparent wafer; segmenting the cap wafer around the patterned film and removing parts of the cap wafer covered by the patterned film to form a plurality of cap structures; providing a device wafer with a plurality of devices and a plurality of contact pads electrically connected to the devices; and hermetically bonding the cap structures to the device wafer at positions corresponding to the devices to form a plurality of hermetic windows.