I don't know why I am getting a black shadow on my monitor

[Arunanshu]

I am using my dell s2415h full hd monitor with zotac GTX 1060 and Intel core i5 6400 processor.
I don't know what is it but I am getting a black shadow on the right side of my monitor
http://imgur.com/4vuOuxf
See it in full screen there's colour gradient difference in screen. Black is much darker on the right side.
But this is appearing only in black screen not any other (I don't know may be it is there but I am unable to see it in other colour)
http://imgur.com/Ys923rX
Can you tell me what's it? Is it a display problem or my GPU or any software issues. It's very problematic seeing movies in a dark room now.

 

[Eximo]

Are those screenshots? Those aren't going to be what is displayed to you on the monitor, just the digital information being sent to it.

IPS monitors can have non-uniform color, particularly at the edges. Just something you have to get used to typically. If it is bad enough and the monitor is still under warranty, have it replaced. You could potentially end up with one that is worse, though.