Screen dims if there's something white on the display

[Bladii]

So, my screen is cracked in the lower left corner and some glass fell out exposing a little bit of the display. I've 3 vertical lines going through the whole screen 2 of them are pink and 1 green. The main issue tho, is that most of the time after I lock the phone and unlock it the screen will go dimmer if there's more white/brighter colors than black/darker colors. Only after I completely reset the phone it will start working normally until I lock the phone.

[BandOfBrothers]

Until an engineer assesses the phone tou wont know if the drop or bump causing the screen damage is causing this @Bladii 

A Samsung Experience Store  / Samsung Service Centre can give you a price for repair.