Torsion on the screen is a sure-fire way to break any eInk device - it fractures the very thin glass substrate that's under the plastic outer layer of the screen. It's relatively immune to being banged or knocked around, but anything which applies pressure to a single point on the screen, or a twisting force (like putting your elbow on it) and it's "curtains" I'm afraid. To be fair, exactly the same is true of a laptop screen, but you're unlikely to put your elbow on that!
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