Hand-held display device can house an entire library with aid of electronic paper that can show movies

The white backing of the electronic paper is coated first with a transparent material that conducts electricity - permitting electrical control of the pixel colour - and then with a transparent film of a water-repellent plastic. The system's switching voltage is low enough that controlling the electronic ink requires only a small power source.

Each pixel of the new display contains a drop of coloured, oily ink that spreads over a reflective white background. When the droplet is fully spread, the pixel looks dark. When it retracts, the pixel looks much lighter. Switching between dark and bright states takes only about ten milliseconds - fast enough to produce sharp video images.

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