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flexibility allows for larger, lighter, thinner devices
As the displays get larger the possibility of breaking the glass back pane when the device is twisted rises. the main way to offset that is to make the glass thicker. which adds weight and thickness. by removing the glass you make the device more durable and can take better advantage of the thin/light properties of the e-ink
apparently most people aren't ready for a flexible device. Plastic Logic was initially showing about a device that wasn't rigid. People didn't like it. People related bendable to cheap and fragile when its actually the opposite.
PolymerVision faced the same hurdle with Readius. One of the main reasons it went to from fully rollable to sort of folded was because people told them it seemed fragile. There's no difference in the material between the earlier designs and the last prototypes just peoples perception
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