@usmanjaved39873 we don't know what this green line looks like. Could be a bad connector, bad flex or a bad display. I suggest you start with your display. [guide|142730]
Oh yeah, post some pictures of what your screen shows, with your Question. That way we can see what you see.
[guide|21499]
While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.