Why is there a red tint around the edges of the 2015 iMac Retina screen?

Question

macOS

Tell me please, I recently noticed that there are such reddenings along the edges of the screen, what is it from and what is the problem?

iMac Retina 2015 27 inch

Answer 1

these are the highlights around the entire perimeter - a typical problem of 2015 retina matrices on aimaks, I apologize for the late reply, I was just looking for info myself and only came across this XD