Patent ID: 7291518

Claim:
A method of packaging a photo-sensing device comprising the steps of: (a) establishing at least one photo-sensing die defining a photo-sensing area at a forward surface thereof for photo-electronically transducing light within a predetermined range of wavelengths; (b) forming on said photo-sensing die a plurality of solder bump pads electrically coupled to said photo-sensing area; (c) establishing at least one unit substrate formed of a material substantially transparent to light within said predetermined range of wavelengths; (d) forming on said unit substrate at least one metal layer and at least one passivation layer adjacent thereto to define at least first and second interconnected sets of solder wettable pads; (e) placing said photo-sensing die in inverted manner over said unit substrate, said solder bump pads substantially aligning respectively with said first solder wettable pads; and, (f) forming a solder joint between said second solder wettable pad and external circuitry to interconnect said external circuitry to said unit substrate.