Micro pick up array mount with integrated displacement sensor
Systems and methods for transferring a micro device from a carrier substrate are disclosed. In an embodiment, a mass transfer tool manipulator assembly allows active alignment between an array of electrostatic transfer heads on a micro pick up array and an array of micro devices on a carrier substrate. Displacement of a compliant element of the mass transfer tool manipulator assembly may be sensed to control alignment between the array of electrostatic transfer heads and the array of micro devices.
1. A micro pick up array mount comprising:
a pivot platform;
a base laterally around the pivot platform;
a compliant element between the pivot platform and the base, wherein the compliant element is coupled with the pivot platform at an inner pivot and coupled with the base at an outer pivot;
a strain gauge integrated along a length of the compliant element; and
a reference strain gauge integrated along the length of the compliant element.
2. The micro pick up array mount of claim 1 , further comprising:
a second compliant element coupled with the base at a second outer pivot and coupled with the pivot platform at a second inner pivot; and a second strain gauge integrated along a respective length of the second compliant element.
3. The micro pick up array mount of claim 1 , wherein the compliant element is coupled with the pivot platform at a second inner pivot and coupled with the base at a second outer pivot.
4. The micro pick up array mount of claim 3 , wherein the inner pivot is across the pivot platform from the second inner pivot, and wherein the outer pivot is across the pivot platform from the second outer pivot.
5. The micro pick up array mount of claim 1 , wherein the compliant element comprises a beam, and wherein the strain gauge is integrated with the beam in a strain region near the inner pivot or the outer pivot.
6. The micro pick up array mount of claim 5 , wherein the strain gauge is bonded to the strain region.
7. The micro pick up array mount of claim 5 , wherein the strain gauge is deposited on the strain region.
8. The micro pick up array mount of claim 5 , wherein the strain region is doped to form the strain gauge.
9. The micro pick up array mount of claim 5 , wherein the reference strain gauge is adjacent to the strain gauge on the beam, and wherein the strain gauge and the reference strain gauge provide adjacent legs in a half Wheatstone bridge.
10. The micro pick up array mount of claim 1 further comprising a temperature sensor on the pivot platform.
11. The micro pick up array mount of claim 1 further comprising a heating contact on the base in electrical connection with a heating element over the pivot platform.
12. The micro pick up array mount of claim 11 , wherein the heating element comprises a resistance alloy.
13. The micro pick up array mount of claim 11 , wherein the heating element comprises a surface-mount technology resistor.
14. The micro pick up array mount of claim 1 further comprising a strain gauge contact on the base in electrical connection with the strain gauge.
15. The micro pick up array mount of claim 1 further comprising a base operating voltage contact on the base in electrical connection with a pivot platform operating voltage contact on the pivot platform.
16. The micro pick up array mount of claim 1 further comprising a base clamp contact on the base in electrical connection with a clamp electrode at a bonding site on the pivot platform.
17. The micro pick up array mount of claim 1 further comprising a bonding site on the pivot platform, wherein the bonding site comprises a metal selected from the group consisting of: gold, copper, and aluminum.