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| Flexible electronics | |
|---|---|
| Name | Flexible electronics |
| Caption | Flexible electronic display prototype |
| Type | Electronic device technology |
| Invented | 1960s–2000s |
| Inventors | Multiple researchers and institutions |
| Applications | Wearable devices, medical sensors, displays, RFID, photovoltaics |
Flexible electronics are a class of electronic devices built on bendable, stretchable, or conformable substrates, enabling circuits and systems to operate while deformed. They emerged from advances in thin-film transistors, organic semiconductors, and printable conductors, and have been driven by research at universities, national laboratories, and companies pursuing wearable computing, biomedical interfaces, and curved displays. Development spans contributions from research groups, corporations, and consortia worldwide integrating materials science, device engineering, and manufacturing.
Flexible electronics trace roots to early thin-film transistor work at institutions such as Bell Labs, Hewlett-Packard laboratories, and research at Massachusetts Institute of Technology and Stanford University, alongside industrial efforts at Sony, Samsung, and E Ink Corporation. Funding and coordination often involved agencies and programs including DARPA, European Commission Framework programmes, and national laboratories like Argonne National Laboratory and Sandia National Laboratories. Milestones include organic light-emitting diode prototypes by teams at University of Cambridge and flexible display commercialization by LG Electronics and Samsung Display. Collaborative initiatives such as the Graphene Flagship and consortia around printed electronics have accelerated translation from labs to pilot fabs.
Substrates commonly use polymers developed by manufacturers like DuPont and research groups at University of Illinois Urbana-Champaign, including polyimide, polyethylene terephthalate, and thermoplastic polyurethane; emerging substrates incorporate 2D materials from projects at University of Manchester and Columbia University such as graphene and transition metal dichalcogenides. Conductive traces employ metals from producers like 3M and Johnson Matthey, printable silver inks commercialized by firms such as Henkel and Sun Chemical, and carbon-based conductors advanced by researchers affiliated with MIT and Rice University. Semiconducting layers include organic semiconductors developed at University of Cambridge and Kyoto University, metal-oxide semiconductors advanced by teams at Toshiba and NTT, and silicon nanomembranes investigated at IBM Research and UC Berkeley. Dielectrics and encapsulants are supplied by companies like BASF and Momentive and studied at institutions including ETH Zurich and University of Tokyo.
Manufacturing approaches span vacuum deposition techniques pioneered at Bell Labs, roll-to-roll printing developed by firms such as Flint Group and research groups at University of Sheffield, inkjet printing advanced by teams at HP Inc. and Fujifilm, and transfer printing methods explored at Harvard University and Northwestern University. Photolithography adapted for flexible substrates has been researched at Imec and CSEM, while laser processing solutions have been commercialized by Coherent, Inc. and studied at Lawrence Berkeley National Laboratory. Additive manufacturing integrates work from Siemens and academic labs at Purdue University for scalable production. Cleanroom-free approaches are investigated by startups emerging from accelerators associated with Y Combinator and incubators partnered with Oak Ridge National Laboratory.
Devices include flexible displays produced by LG Display and Plastic Logic, photovoltaic modules developed by First Solar and research teams at National Renewable Energy Laboratory, and wearable sensors commercialized by companies like Fitbit and startups spun out of Imperial College London. Biomedical implants and patches leverage work at Johns Hopkins University and Mayo Clinic while epidermal electronics trace development to groups at University of Illinois Urbana-Champaign and KAUST. Radio-frequency identification (RFID) tags and sensors have been manufactured by Avery Dennison and Smurfit Kappa, and smart textiles incorporate research from Nike collaborations and textile labs at North Carolina State University. Applications extend to aerospace conformal antennas developed by Boeing and Airbus, automotive lighting and sensors by Continental AG and Bosch, and consumer electronics by Apple Inc. and Sony Corporation.
Characterization relies on facilities such as National Institute of Standards and Technology and specialized testbeds at Fraunhofer Society institutes for mechanical cycling, thermal aging, and environmental exposure. Reliability studies cite failure modes examined at Sandia National Laboratories and Los Alamos National Laboratory, and electrical performance benchmarking performed by groups at IEEE conferences and standards bodies like JEDEC. Mechanical fatigue testing protocols are influenced by work at TÜV Rheinland and Underwriters Laboratories laboratories. Biocompatibility testing for implantable devices references protocols from Food and Drug Administration guidance and clinical trials run at hospitals including Mayo Clinic and Massachusetts General Hospital.
System integration combines flexible components with rigid silicon dies using heterogeneous integration strategies developed at Intel and research centers at IMEC and CSEM. Packaging solutions include thin-film encapsulation patented by companies such as Holst Centre collaborators and barrier technologies from Evonik Industries. Interconnect technologies leverage anisotropic conductive films from suppliers like 3M and flip-chip techniques refined by Advanced Semiconductor Engineering. Thermal management strategies draw upon expertise from General Electric and research at Oak Ridge National Laboratory for aerospace-graded flexible systems.
Key challenges include scaling manufacturing addressed by pilot lines at Semiconductor Research Corporation and supply-chain coordination involving firms like Applied Materials, materials purity concerns studied at Lawrence Livermore National Laboratory, and standardized test methods pursued by ISO committees and IEC. Future directions point toward integration with emerging platforms such as flexible neuromorphic devices researched at MIT-IBM Watson AI Lab, stretchable power sources from groups at University of California, San Diego, and multifunctional skins investigated in collaborations involving DARPA and European Space Agency. Societal and regulatory adoption will engage institutions like World Health Organization and national regulatory agencies for medical and consumer safety.
Category:Electronics