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Electonic ink, or e-ink, turns a piece of paper into a computer monitor. Imagine you've just finished reading Moby Dick. Press a few buttons on the spine of the book in your hand, and the words on its pages change to The Count of Monte Cristo.

Electonic ink is a vague term, just as electronic book can mean anything from a PDF file the hardware that displays such files. Most e-ink designs use electronic "paper"- a plastic film filled with tiny magnetic pigment capsules. Electrical charges are used to arrange the capsules and show content or reformat the display (think of a Boggle cube if that helps).

Companies working on e-ink include E Ink, a pre-IPO Bell Labs spinoff, and Gyricon Media, a division of Xerox PARC. Some early prototypes were dynamic signs in stores - not much more than large flat panel displays. Recent efforts have produced some thin, flexible models, some even in color. While you're waiting for e-ink and the flying car, it's probably best to check out A Tale of Two Cities from your local library for now.

Sources:
http://www.howstuffworks.com/e-ink.htm
http://www.eink.com/technology/
http://www2.parc.com/dhl/projects/gyricon/
http://dmoz.org/Computers/Hardware/Peripherals/Displays/Flat_Panel/E-Ink/

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