They really are still relatively fragile screens in this age of Gorilla Glassed LCD displays... You'd think they might address the problem by finding a less fragile substrate until they work out the kinks in flexible e-ink displays. Consumer items which are designed to be easily carried about in order to be "at hand" really should be tougher.
As has been noted in other threads the giveaway that it's a substrate break is the diagonals apparent in the break area.
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