display light auto on and off

[Android Central Question]

I have samsung j5 2015 and my mobile display light automatically on and off .
Whats the reason ??
Whats the fult?

 

[DJJosephJumper]

Make sure you don't have any apps installed that are meant to wake the screen that are going rogue. Sometimes apps like "always on display" apps from the Play Store can wake and sleep your phone for no apparent reason.