Taiwanese company Polytron Technologies recently unveiled a conceptual smartphone that utilizes smart-glass gizmo. The prototype can't make calls just yet and isn't fully transparent due to technology limitations.

Polytron plans to integrate its Switchable Glass technology so the entire phone may appear opaque when not in use, and clear when powered on.
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(Photo credit: Christopher MacManus/CNET)
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"When the power is off, the liquid crystal molecules are randomly oriented [way] that scatters incident light and the screen becomes opaque. When electricity is applied, the liquid crystal molecules line up, the incident light passes through, and the screen looks clear."
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