A newly patent application from Motorola has revealed a design for a
mobile that features a foldable / roll-upable display and keypad. this
concept is nothing new. The are quite a few of these gadgets on the
market or at least in late prototype stage but all of them have one
problem, flexible/rollable is by definition not rigid. And using the
phone with a keypad or display flapping in the wind, is not such a
good idea.

The READIUS unveiled by Philips subsidiary PolymerVision. It has a display the size of two business cards into a gadget no bigger than other mobile phones. They do this by making a screen that is foldable. The 5-inch (13-cm) display is the world’s first that folds out when the user wants to read news, blogs or email and folds back together so that the device can fit into a pocket.

You get the large display of e-reading, the super battery life of e-reading, and the high-end connectivity … and the form factor and weight of a mobile phone.