Patent ID: 9748218
Date: 2017-08-29
CPC Classifications: H01L,H04B

Claim:
1. A method to form a chip stack, the method comprising: forming a first microchip having a first plurality of light emitting diodes (LEDs) at a surface thereof, the first microchip having a plurality of first metal interconnects; forming a second microchip having a second plurality of LEDs at a surface thereof, the second microchip having a plurality of second metal interconnects; aligning the first microchip with the second microchip to form an aperture between the first microchip and the second microchip, the aperture defining a plurality of optical paths for optical data communication between the first plurality of LEDs of the first microchip and the second plurality of LEDs of the second microchip; interconnecting the first plurality of metal interconnects with the second plurality of metal interconnects, the metal interconnects exclusively communicating power or ground between the first microchip and the second microchip; disposing a coolant in the aperture, the aperture configured to receive incoming coolant at an aperture inlet and to exit coolant at an aperture outlet; wherein the all data communications between the first microchip and the second microchip is exclusively through surface-to-surface optical communication, and wherein the pitch distance between adjacent metal interconnects is about 400-500μ.