Screen (Display) has Yellow and colour strange

[ultras23]

I m using Galaxy Note 9 last 2 years . Last 2 days screen has Yellowish and colour is strange. Plz tell anyone what's the problem and what should I do. 

[32bitboy]

check if you have accidentally turned on eye confort shield. Its there in notification panel and also in settings.
Refer image.
Gray means off and any other colour (depends on theme, blue in my case) means on.

[kaisar001]

You have to change the display. It's a common problem for note and s series.