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>Thanks, that would be very interesting. The e-ink one should be very light and work on one AAA battery for weeks. :)
Maybe I'm thinking of something different than eInk, but I don't think it requires batteries. What I've seen (not in person, only on TV), was paper thin sheet that was more or less an etch-a-sketch. Xerox had been developing it and planned to use it for store signs pretty soon.
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