My phone screen keeps flickering on Galaxy s6

[AC Question]

Just a couple hours ago my phone had fallen out of my pocket and now everytime my phone goes into resting mode it will flicker for a couple seconds, and if I press the power button it'll flicker for about a minute then go to my lock screen. I really don't want my dad to be mad at me, nothing cracked so I don't know if it's a screen problem or a problem inside the phone itself

 

[Rukbat]

It probably is something cracked - inside the phone. It has to go to a repair shop.