Your next cellphone could have a 100-inch screen—without getting an inch bigger. Microvision's tiny PicoP projector can turn a wall, tabletop or any other surface into a display. It's small enough to fit in pocket-sized gadgets because it uses lasers, which sip power, are extremely bright, and produce little heat. They also do away with bulky lenses: The pinpoint beams are always in focus, from any distance.

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