Screen dims without reason

[HannibalMark]

My tv screen dims when watching without readon

[HannahEd01]

Hey HannibalMark, please provide the model number so that we can help. 

[royabrown2]

@HannibalMark 

Is this what needs adjusting or turning off?

https://www.sony.com/electronics/support/articles/00173465

Note that while it says OLED, if that isn’t what you have, something we have been left to conjecture, LCD screens can have similar settings.