Using a Bluetooth-connected E-Ink screen with its own independent power supply, the inkCase i6 allows the back of your phone to become…a second screen for your iPhone.
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popSlate E-Ink Case Turns The Back Of Your iPhone 5 Into A Second Display [video]
popSlate has introduced a new E-Ink screen/case for the iPhone 5. Basically a case that adds a secondary display to your iPhone.