At once screen brightness dimmed near about 50 %

[AC Question]

I yu phone having 5'.5" screen,battery level is ok,but suddenly screen brightness dimmed,Tried many way but not improve the existing brightness.Please help me what are the problem?
Balakrishna

 

[the tall guy]

Hi, have you tried increasing the brightness of the phone? also, the screen will dim when the battery starts to go down, usually below 20%.