Question Crazy screen iPhone

[Heliomota]

Hello friends, I have an iPhone XS Max.
He has already taken some falls (use silicone cover and glass film) and never got water.
One day after normal use, he presented a green screen, I didn't know what to do. I verified that the green screen worked on the touch and started to try to change the configuration in something.
For my surprise, when I touched the brightness ló w or reset the screen Back to normal.
does anyone know the explanation and resolution?

attached gif and photo

thanks
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[helpstar]

the explanation could be either a broken LCD or the flex inside the phone is damaged/not plugged in completely

 

[Bryce Sadler]

Probably damaged display cable or graphic controller when it fall