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Pico projectors, LED-based devices small enough to fit into an MP3 player or even a slightly oversized cell phone, were prominently on display at the CES (Consumer Electronics Show) in Las Vegas both this year and last. The obvious use for this type of projector is to show impromptu screenings of your YouTube videos or in-your-face slide shows to a group of friends--in the same way that you currently use full-sized projectors. Unlike the large projectors, however pico devices can make any surface a sign, an art installation, or a call to action and thus may usher in entirely new applications.
An example of a dedicated pico projector is the GP1 from BenQ. The GP1 uses the Luminus PhlatLight LED PT-39 chip set, which includes one red, one green, and one blue LED on each chip of the three-chip set. The chip set works with handheld-projection devices with microsized displays ranging from 0.4 to 0.55in. wide. The GP1, for example, provides 100 ...