After July security update dark screen has gone and Brownish colour appears instead of deep black. And also green tint appears when using extra dimDear Samsung try fix this problem
Any of solutions given by Samsung in above link won't work, i had tried it few times like safe mode, restore factory data and visiting service center etc, in service center they checked and confirmed that there's no problem in screen, but asked me to...
I had same issue after last year's July update, there's no response from Samsung side, if you go to service center they'll ask you to change the display
