Patent ID: 6864116

Claim:
A method of packaging a photosensing device comprising the steps of: (a) establishing at least one photo-sensing die having at least integrated one photo-sensing area defined 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 first solder bumps 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 at least one metal layer on said unit substrate about a front surface region thereof, (e) configuring said metal layer to define a plurality of first and second solder bump pads and a plurality of interconnection lines each extending between at least one first solder bump pad and at least one said second solder bump pad; (f) forming at least one passivation layer to extend over said metal layer; (g) configuring said passivation layer to define a plurality of first and second access openings aligned respectively with said first and second solder bump pads; (h) placing said photo-sensing die in inverted manner over said unit substrate, said first solder bumps each engaging one said first access opening of said passivation layer to contact one said first solder bump pad, said photo-sensing area of said photo-sensing die being thereby guided into alignment with said front surface region of said unit substrate; and, (i) heating said first solder bumps to a characteristic reflow temperature thereof for attachment to said first solder bump pads of said unit substrate.