Nearly everyone knows what the inside of a computer or a mobile phone looks like: A stiff circuit board, usually green, crammed with chips, resistors, capacitors and sockets, interconnected by a suburban sprawl of printed wiring.
Fig 1: Example of a flexible-circuit film.
- Flexible electronics open the door to foldaway smartphone displays, solar cells on a roll of plastic and advanced medical devices -- if we can figure out how to make them.
But what if our printed circuit board was not stiff, but flexible enough to bend or even fold?
Flexible electronics are in vogue for two reasons.
First, they promise an entirely new design tool. Imagine, for example, tiny smartphones that wrap around our wrists, and flexible displays that fold out as large as a television. Or photovoltaic cells and reconfigurable antennas that conform to the roofs and trunks of our cars. Or flexible implants that can monitor and treat cancer or help paraplegics walk again.
Fig 1: Example of a flexible-circuit film displayed by a member of Professor Tom Jackson's Electronics Research Group on Penn State's University Park campus.
Penn State's interest in flexible and printed electronics is not just theoretical. In October 2011, the University announced a multi-year research project with Dow Chemical Corporation. Learn more about the partnership.
Second, flexible electronics might cost less to make. Conventional semiconductors require complex processes and multi-billion dollar foundries. Researchers hope to print flexible electronics on plastic film the same way we print ink on newspapers.