Stretchable electronic device
A stretchable electronic device is disclosed. In one aspect, the device includes at least one combination of a stretchable electronic structure having a first Young's modulus and a rigid or flexible electronic structure having a second Young's modulus higher than the first Young's modulus. The stretchable electronic structure and the rigid or flexible electronic structure may be electrically connected to each other by a semi-transition structure having a third Young's modulus with a value in a range between the first and the second Young's modulus.
1. An electronic device comprising:
at least one combination of a stretchable electronic structure, the stretchable electronic structure comprising a plurality of meander-shaped conductive structures each inserted in an elastomeric polymer and having a first Young's modulus, and a rigid or flexible electronic structure having a second Young's modulus higher than the first Young's modulus, the stretchable electronic structure and the rigid or flexible electronic structure being electrically connected to each other,
wherein the at least one combination further comprises a semi-transition structure located between an end part of the stretchable electronic structure and an end part of the rigid or flexible electronic structure and configured to establish the electrical connection therebetween, the semi-transition structure having a third Young's modulus with a value in a range between the first and the second Young's modulus,
wherein the semi-transition structure comprises a meander-shaped structure between the end part of the stretchable structure and the end part of the rigid or flexible structure.
2. The electronic device according to claim 1 , wherein the value of the third Young's modulus is constant along the semi-transition structure.
3. The electronic device according to claim 1 , wherein the value of the third Young's modulus increases along the semi-transition structure from a first value for a part of the semi-transition structure adjacent the end part of the at least one stretchable electronic structure towards a second value for a part of the semi-transition structure adjacent the end part of the at least one rigid or flexible electronic structure.
4. The electronic device according to claim 1 , wherein the meander shaped structure of the semi-transition structure has a meander width which increases gradually from the end part of the stretchable structure towards the end part of the rigid or flexible structure.
5. The electronic device according to claim 1 , wherein the stretchable electronic structure, the rigid or flexible electronic structure and the semi-transition structure have shapes and physical dimensions such that when the at least one combination is stretched, the semi-transition structure elongates by a relative magnitude that is between magnitudes of elongation of the stretchable electronic structure and of the rigid or flexible electronic structure.
6. The electronic device according to claim 5 , wherein the semi-transition structure comprises an edge region of the rigid or flexible structure having one or more cut-out portions in the end part of the rigid or flexible structure.
7. The electronic device according to claim 5 , wherein the semi-transition structure comprises at least one protrusion extending from the end part of the rigid or flexible structure and connected to the meander-shaped structure of the semi-transition structure.
8. The electronic device according to claim 7 , wherein the stretchable structure is a meander shaped structure with a meander width smaller than a meander width of the meander shaped structure of the semi-transition structure.
9. The electronic device according to claim 5 , wherein the meander-shaped structure of the semi-transition structure has a width which increases gradually from the end part of the stretchable structure towards the end part of the rigid or flexible structure.