Optical package with stacked integrated filters

An optical filter package, comprising:

• a glass plate having a first surface and a second surface opposite to the first surface, wherein the first surface has a first filter, and the second surface has a second filter;
• a semiconductor die including a light sensor and having a third surface and a fourth surface opposite to the third surface, wherein at least a portion of the third surface has a third filter;
• an optically transparent adhesive in contact with the second surface of the glass plate and the third surface of the semiconductor die;
• an optically opaque mold compound peripherally surrounding the glass plate and the semiconductor die such that the first surface of the glass plate is exposed;
• a substrate comprising a first region proximate to the fourth surface of the semiconductor die, and a second region to electrically couple to the semiconductor die;
• and
• an adhesive mechanically coupling the substrate to the fourth surface of the semiconductor die.

A method of making an integrated filter package, comprising:

• attaching a film of optically transparent adhesive to a glass wafer, the glass wafer including different filters on opposing surfaces;
• dicing the glass wafer into individual glass plates, each glass plate including a portion of the film of optically transparent adhesive;
• placing a glass plate on a top surface of an assembly comprising a semiconductor die including a light sensor, wherein:
• a surface of the semiconductor die proximate to the glass plate includes at least one other filter, and
• the portion of the film of optically transparent adhesive is between the glass plate and the surface of the semiconductor die;
• applying pressure on an exposed surface of the glass plate and curing the portion of the film of optically transparent adhesive;
• electrically coupling the semiconductor die to a substrate;
• applying an optically opaque mold compound along a periphery of the semiconductor die and the glass plate;
• and
• curing the optically opaque mold compound.