Google has submitted a new patent application (#20130016070) that describes an addition to the Project Glass HMD - a small laser pico projector that can be used to display a QWERTY keyboard or other UI objects. The built-in camera will be used to recognize finger movements and commands of course.
This kind of UI is not really new, we've seen concepts showing such devices back in 2010. But still Google may get the patent as it specifically relates to HMD glasses...
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