Imaging device and method of manufacture
View Patent ↗An imaging chip is packaged in transparent injection molded material. The chip may have photosensitive elements arranged in a two-dimensional array on semiconductor material. Each element corresponds to a pixel of an image. The package may be formed of epoxy resin. In one aspect of the invention, the transparent plastic material provides a color filter. Second and third packages with complementary color filters may be used to provide signals for a color imaging system. In another aspect of the invention, a lens is integrated into the plastic package. In another aspect of the invention, a semiconductor chip is applied to a pre-formed plastic package by bump bonding.
1. A method of making an image device, comprising the steps of:
locating a semiconductor device in a mold, said device including an integrated circuit and photosensitive elements;
injecting transparent resin into said mold such that said integrated circuit and said photosensitive elements are covered by said transparent resin;
providing a color filter by coloring said transparent resin; and
subsequently, removing said semiconductor device from said mold.
2. The method of claim 1 , further comprising the steps of applying a release agent to said mold, wherein said step of applying a release agent occurs prior to said step of injecting said transparent resin into said mold.
3. The method of claim 1 , further comprising the steps of attaching leads to said semiconductor device, said leads being partially encapsulated in said transparent resin.
4. The method of claim 3 , wherein said transparent resin is a thermosetting resin, and further comprising the step of curing said thermosetting resin to form a package encapsulating said semiconductor device.
5. The method of claim 4 , further comprising the step of forming a lens in said package.
6. A method of making an imaging device, comprising the steps of:
locating leads and bond pads in a mold, said leads being connected respectively to an associated bond pad;
injecting transparent resin into said mold such that inner ends of said leads are encapsulated in said resin, outer ends of said leads and portions of said bond pads remaining exposed outside said resin;
curing said resin to form a plastic package supporting said leads and bond pads; and
subsequently, bump bonding a semiconductor device to said bond pads to electrically connect said semiconductor device to said leads.
7. The method of claim 6 , wherein said semiconductor device includes photosensitive elements.
8. The method of claim 7 , wherein said resin is a clear epoxy resin.
9. A method of making an image device, comprising the steps of:
locating a semiconductor device in a mold, said device including an integrated circuit and photosensitive elements;
attaching leads to said semiconductor device,
injecting a colored transparent thermosetting resin into said mold such that said integrated circuit and said photosensitive elements are covered by said transparent resin;
curing said thermosetting resin to form a package encapsulating said semiconductor device, said package providing a color filter in said transparent resin.