Now that it has nailed the e-book business, E Ink is diversifying again.

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As well as being used for in-store signage, E Ink's technology powers Sony's e-book reader, and in April, Seiko, a watchmaker, unveiled a digital watch built around an E Ink display.

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Like many of the e-book readers that followed, it used e-ink - an innovation developed by a US company of the same name.

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More than 20 million flexible plastic displays are on the market today, according to Sriram Peruvemba, vice-president of marketing for E Ink, the company that developed the low-power display technology for the Amazon Kindle and many other e-book readers.

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