Checkerboard pattern glitch

Hey everyone,

I'm in need of help. While I was traveling, I had my tablet in my bag which I believe caused some pressure.
Because of that, I have this weird checkerboard board pattern that appears whenever I turn my tablet's screen on (doesn't appear when the screen is off). I tried to upload a picture but any picture that I take seems to be too large for the forum's servers. I'll describe it instead:
It's not a perfectly square checkerboard. It's comprised of alternating black and white...

Checkerboard pattern glitch

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