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[i Quote from source:
Researchers at Philips, the Dutch electronics giant, have designed a novel type of electronic paper that can change colour at the flick of a switch and does not require backlights. Philips says that the e-paper could be used for digital signs, enabling shop displays to be changed rapidly, and then retained without consuming too much energy. It is also seeking to develop colour-changing "skins" for products like mobile phones and handheld games consoles.