Flipchip interconnected light-emitting diode package assembly
A light-emitting diode (LED) package assembly includes a substrate. The substrate includes a top surface, a bottom surface and an opening formed through the substrate. The opening includes a first portion adjacent the top surface and a second portion adjacent the bottom surface that is wider than the first portion such that portions of the substrate overhang the second portion of the opening. Pads are provided on a bottom surface of the portions of the substrate that overhang the second portion of the opening. The assembly also includes a hybridized device in the opening. The hybridized device includes a silicon backplane that has a top surface, a bottom surface and interconnects on the top surface. The interconnects are electrically coupled to the pads. The hybridized device also includes an LED array on the top surface of the silicon backplane.
1. A light-emitting diode (LED) package assembly, comprising:
a substrate comprising a top surface, a bottom surface and an opening formed through the substrate, the opening comprising a first portion adjacent the top surface and a second portion adjacent the bottom surface that is wider than the first portion such that portions of the substrate overhang the second portion of the opening;
a plurality of pads on a bottom surface of the portions of the substrate that overhang the second portion of the opening; and
a hybridized device in the opening, the hybridized device comprising:
a silicon backplane comprising a top surface, a bottom surface and a plurality of interconnects on the top surface, the plurality of interconnects being electrically coupled to the plurality of pads, and
an LED array on the top surface of the silicon backplane.
2. The LED package assembly of claim 1 , wherein the plurality of interconnects comprise at least one of solder bump joints or copper pillar bump joints.
3. The LED package assembly of claim 1 , wherein the LED array is between the top surface of the substrate and the silicon backplane.
4. The LED package assembly of claim 1 , wherein the portions of the substrate that overhang the second portion of the opening form an intermediary surface between the top surface of the substrate and the bottom surface of the substrate, the intermediary surface being substantially parallel to the top surface and the bottom surface of the substrate, and the plurality pads being on the intermediary surface.
5. The LED package assembly of claim 1 , wherein an entirety of the silicon backplane is within the second portion of the opening.
6. The LED package assembly of claim 1 , wherein at least a portion of the LED array is within the first portion of the opening.
7. The LED package assembly of claim 1 , further comprising a heat sink thermally coupled to the bottom surface of the silicon backplane.
8. The LED package assembly of claim 1 , wherein the LED array is a monolithic array comprising a plurality of light-emitting segments.
9. The LED package assembly of claim 8 , wherein the silicon backplane comprises a plurality of drivers, one of the plurality of drivers being electrically coupled to provide a drive current to one or a subset of the plurality of light-emitting segments.