Credit: Bob O'Connor

Gadgets like the Sony Reader and the newer ­Amazon Kindle let people read downloaded e-books on crisp displays that are clear even in bright sunlight. But while the devices reproduce the experience of reading ink on paper, they're rigid, monochrome, and relatively slow to switch pages. Laboratory advances from E Ink of Cambridge, MA, whose tech­nology is used in both e-­readers, are pushing electronic-paper tech­nology into color and video.

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