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Doesn't have to be aluminium if another, lighter material have good characteristics, maybe some plastic. But I absolutely agree that the cover should prevent crushing of the display.
There are more ways how to improve the chances:
1) Screen below the edge - even 1mm below the edge would ensure that flat surface, like 1mm aluminium sheet in the cover, won't damage the sceen. Additionaly, it lowers a chance to crush or scratch the screen if it drops on flat ground.
2) Instead of higher edge, 1-2mm high "nipples" (I am not sure about the word, correct me if it's nonsence) in the corners of the device or around the screen, protection is lower and I think it would look worse, but again, it is a protection against crush attack.
If the device works well with the cover, like the cover of normal paper books, there would be no serious need to take it out for reading and "book-like feeling" would be a plus to number of people. Now if you drop such covered device, there is some chance that the cover will close and protect the screen even if it was open before droping.
Also, I think it would be good idea to keep the cover closed with magnet, but because I never had any electronic reader, I can be wrong, if you know better way, again, correct me.
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