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This technology was unavailable to the public - until now!

FPCs have been around for many decades:

http://en.wikipedia.org/wiki/Flexible_electronics#History

I'm somewhat surprised that they didn't go for bare die versions of ICs like the MCU, since COF is another quite-established technology for cheap flexible electronics.

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You're very right, we should clarify. The technologies not previously available to the public refer to the printed electronics components: electrochromic displays, printed carbon-zinc batteries, LED die chips on film, printed polymer solar cells and printed light sensors.

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