A newly unearthed patent application from Motorola has revealed a design for a cellphone that features a foldable / roll-upable display and keypad. While the concept is nothing new, it appears that Motorola believes that it can overcome many of the structural problems that these devices face by incorporating a reservoir with electrorheological fluid beneath the foldable display or keypad. When electric current is applied, the fluid becomes solid. When the current is absent, the opposite occurs.
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