Stretchable electronics for ambient applicationsF. Bossuyt, T. Vervust, F. Axisa, J. Vanfleteren
Functional flexible islands connected with stretchable interconnections embedded in a stretchable polymer
Carrier removal
Bottom moulding
CMST - Ghent University – Technologiepark 914A, 9052 Zwijnaarde
Polyimide supported islands
Polyimide supported meanders
Smooth flex-stretch transitions
Sensors, actuators,..
Smooth polymer shapes
Completely moulded in polymer
PCB manufacturing steps on carrier
Process overview
Stretchable electronics technology overview
Stretchable copper meanders
Demonstrators
Stretchable LED-matrix
Philips Activity monitor
Technology characteristics & highlights
PCB-manufacturing steps on rigid board till moulding Testing and repairing capability before moulding
Breathability possible by moulding Washable
2500 times stretchable @ 10%
Copper (9µm - 18µm – 35µm - 70µm)20 µm polyimide meander- and flexible island support
Meander density: 5 lines/cmMin. line width: 100 µm
Reflow soldering (SAC), AdhesivesPolymer type: PDMS
Thickness of base polymer: >200 µmSize of sheet processing: 10 cm x 10 cm
Standard SMD components
Applications
Smart textiles Intelligent bandages Drug delivery systems Artificial organs Strain absorbing systems Robotic skins Large area sensor arrays Ambient actuators Conformable lighting
www.stella-project.de
Inductive link
Verhaert Babymonitor
LED-band
Temperature sensors
Top moulding
Polyimide patterning
Copper sheet
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