What is flexible electronics ?
Flexible electronics, also known as flex
circuits, is a technology for assembling
electronic circuits by mounting electronic
devices on flexible plastic substrates.
Flexible Circuit boards
Flex circuits are made up of
usually polyimide, Polyester or
thin sheets of glass
Flexible electronic components
Electronic components such as transistors are
being made from silicon nanomembrane usually
called TFT’s(thin film transistors).
Flexible resistors & capacitors structures are
shown diagrammatically usually called thin flim
resistors and thin flim capacitors
Organic light-emitting diodes (OLEDs) are
normally used instead of a back-light for flexible
Manufacturing of flexible circuits & devices
For the manufacturing of flexible electronics
“Roll to Roll” (R2R) processing inkjet printing
and soft lithography process is used.
Steps of R2R processing
Layers materials and their thickness
Base material or
1.Flexible polymer flim
3. Thin glass sheet
1. Copper foil
• The market for flexible, printed, and organic large-area
electronics is rapidly growing. Currently estimated at over
$200M, the global market is expected to increase to a $800M
market by 2020.
Stretchable Lithium ion battery
Developed by University of llinois at Urbana
Initial investment may
components would be
challenge for engineers
Flexible electronics in future will play a part
in field of security, entertainment and may lead to
The demand for flexible electronic products
at present may not be noticed but upto 2020 there
would be huge demand and preference will be
given to the flexible products in market
 "Printed Circuit Techniques" by Cledo Brunetti and Roger W. Curtis (National
Bureau of Standards Circular 468 first issued 15 November 1947)
 Gleskova, H., Wagner, S., Gasˇpar k, V. & Kova´cˇ, P. 150uC Amorphous
Silicon thin-Film Transistor technology for Polyimide Substrates. J.Electrochem.
Soc.148, G370-G374 (2001)
 Cotema, coating machinery GmbH www.cotema.de