In the last few years, head-up displays (HUDs), which project information onto the driver's view of the road, have started appearing in a few high-end cars. But a more compact kind of projection device, small enough to fit inside a rearview mirror, could see this kind of display more widely deployed. The new projection device, developed by Light Blue Optics, based in Cambridge, UK, uses a technique called holographic projection that allows it to be far smaller than current in-car HUD systems. (source: technologyreview.com)
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