Why broken iPhone 6 lcd corner caused vertical lines on the screen?

I just saw a post about iPhone 6 lcd with damaged lcd corner in the aftermarket. It says that this damage will cause the vertical lines on the screen, why? You can see the post here:

Attention: iPhone 6 LCD with Broken LCD Corner in the Aftermarket

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Damaged LCD. Refurbish not done properly and/or bad quality screen.

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