Motorola’s Foldable/Rollable Phone

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.

But Motorola has found a solution. They use reservoir with
electrorheological fluid beneath the foldable display or keypad. This
fluid becomes a solid material when electric current is applied to it,
and then reverts again to fluid state when the
electric current disappears.

When a call comes in, electric current will be applied to the fluid
and the display will roll out. the display will transform into a solid
state similar to a normal phone. As mentioned previously, this
technology could also be applied to the keyboard—resulting in a phone
with a form factor small enough to make a matchbox sized mobile phone.
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