This interesting device from Nokia incorporates a 'housing frame, a transparent display and a movable element'. It was submitted in Oct 2009 and approved in January this year.
The movable element houses a keyboard and can be folded behind the transparent screen (figs 1 and 3) or below the screen (fig 2).
Nokia list several benefits of this design, including improved form factor when compared to other transparent screen devices, improved performance in bright light and the ability to use the folding keyboard as a stand.
An interesting application of this design could be the use of the transparent screen as a viewfinder when using the camera.
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