Imperceptible organic electronics

A wide range of materials and material combinations, from hard and brittle to soft and elastic, is now available for the design of ultraflexible organic electronic circuits. Potential applications range from large-area active-matrix sensor arrays to displays, usable in next-generation smart appliances for mobile health, sports, and well-being. Weight and flexibility dominate the mechanical response and perception of such electronic skins, and have been developed into key figures of merit in circuit design. We review the design of thin (0.3-3 mu m), ultralight (0.7-6 g/m(2)) large-area imperceptible electronic foils employing low-cost fabrication techniques compatible with mass production.