In what could be the holy grail of tablet computing, Apple's latest applied patent (see image below, right) showcases using a transparent multi-touch display that can work as a control surface on two sides, both while the device is open and closed.
The patent avoids twisting the notebook/ tablet screen completely. The transparent touch display takes the normal role of a multi-touch surface when the computer is closed, so you can simply operate on the closed top face surface.
When the computer is opened, using a typical notebook clamshell move, the inside bottom surface will display a keyboard (or any other kind of user interface) while the top surface still serves as a normal notebook screen.
Transparent Apple Displays
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