Strain isolation structures for stretchable electronics
Buffer structures are provided that can be used to reduce a strain in a conformable electronic system that includes compliant components in electrical communication with more rigid device components. The buffer structures are disposed on, or at least partially embedded in, the conformable electronic system such that the buffer structures overlap with at least a portion of a junction region between a compliant component and a more rigid device component. The buffer structure can have a higher value of Young's modulus than an encapsulant of the conformable electronic system.
1. An apparatus comprising:
a device component;
a conductive stretchable interconnect electrically coupled with the device component at a junction region;
a first buffer structure including a first buffer structure main body, a first projection portion, and a second projection portion, the first projection portion extending outwardly from the first buffer structure main body and being disposed along a first side of the conductive stretchable interconnect, the second projection portion extending outwardly from the first buffer structure main body and being disposed along a second opposing side of the conductive stretchable interconnect;
a second buffer structure including a second buffer structure main body, a third projection portion, and a fourth projection portion, the third projection portion extending outwardly from the second buffer structure main body and being disposed along the first side of the conductive stretchable interconnect, the fourth projection portion extending outwardly from the second buffer structure main body and being disposed along the second opposing side of the conductive stretchable interconnect; and
an encapsulant encapsulating the device component, the junction region, and the buffer structure.
2. The apparatus of claim 1 , wherein the first buffer structure main body has a disk shape.
3. The apparatus of claim 2 , wherein the first projection portion and the second projection portion each have a polygonal shape.
4. The apparatus of claim 2 , wherein the first buffer structure is positioned such that at least a portion of the first buffer structure main body overlaps with the device component.
5. The apparatus of claim 1 , wherein the first buffer structure is positioned such that at least a portion of the first buffer structure contacts the device component or the conductive stretchable interconnect.
6. The apparatus of claim 1 , wherein the first buffer structure is positioned such that at least a portion of the encapsulant extends between the first buffer structure and the device component.
7. The apparatus of claim 1 , wherein the first buffer structure main body has an annular shape.
8. The apparatus of claim 1 , wherein the first buffer structure main body has a torus shape.
9. The apparatus of claim 1 , wherein the second buffer structure is positioned such that at least a portion of the device component or the conductive stretchable interconnect is disposed between the first buffer structure and the second buffer structure.
10. The apparatus of claim 1 , wherein a central point of the first buffer structure and a central point of the second buffer structure are generally coincident with each other.