Patent ID: 7297610

Claim:
A method of segmenting a wafer comprising: providing a device wafer comprising a substrate layer and a device layer disposed from bottom to top; forming a first mask pattern on a surface of the device layer, the first mask pattern comprising a plurality of first openings which partially expose the surface of the device layer; removing the device layer not covered by the first mask pattern; removing the first mask pattern, and forming a medium layer on the surface of the device layer; bonding a surface of the medium layer to a carrier wafer; forming a second mask pattern on a surface of the substrate layer, the second mask pattern comprising a plurality of second openings corresponding to the first openings; removing the substrate layer not covered by the second mask pattern; removing the second mask pattern; separating the medium layer from the carrier wafer; and bonding the substrate layer to an extendable film, and removing the medium layer.