Can you post a photograph of the screen? A fractured substrate has a very characteristic appearance, and we can immediately tell you if that's what you've done if we can see a photograph.
It's not knocks that fractures the substrate as much as twisting forces. If you've put the reader in your pocket, and then leaned forward, applying a bending force to the screen, that WILL break the screen. Always, ALWAYS keep you reader in a good rigid case.
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