Dear Samsung Member,
Greetings from Samsung Customer Support!
Please perform the below mentioned steps to resolve the issue:
1. Adjust the brightnessSettings > Display > Adjust the brightness.
2. Check device in safe mode:- Press and hold the Power key, when Power off icon appears > Press and hold the power off icon. Exit safe mode: Hold the power button and select restart on the screen.
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).
Thank you for writing to Samsung.
Warm Regards,Samsung Customer Support