As we become increasingly aware that there is more to light than the image it forms on our retina, and as we become more environmentally aware, the value of non-image-forming light increases along with the need for various new light related appliances. In particular, some lighting related applications are emerging which demand conformability (flexibility and stretchability). Well-being, automotive or wearable electronic applications are just a few examples where these trends can be observed. We are finding that conformability could bring various benefits to both users (tactile and optical comfort, optical efficiency, multi-functionality, work/living space savings) as well as manufacturers (heterogeneous integration, light-weight, design freedom, differentiation and less stringent tolerancing). Developed by Ghent University, the SMI (Stretchable Molded Interconnect) technology attempts to address these demands and has been the main focus of this work. With the SMI technology it was possible to design highly conformable circuits using fabrication methods similar to these found in the PCB and FCB industries and standard off-the-shelf electronic components. The goal of this work was to characterize the technology materials in terms of mechanical, optical and reliability performance as well as define a set of design rules to support creation of robust and efficient light modules, also using a set of new, commercially available elastomeric, polymer materials. The developments are illustrated with demonstration devices.
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Ghent University. Faculty of Engineering and Architecture