Why on 8/10 of my iPhone screen are half the pixels gone?

On the top part of my screen my display is normal, but below it rows of pixels are not lit up. It is only this way sometimes but it is really annoying. If you know what i'm talking about please help.

Have we " dropped " a few times to many the phone? Have we had the phone in our back pocket and sat down on it? Have we stuffed the phone into a book bag? Sounds like broke to me…

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