Add me to the people having screen issues, second Lumia 930 now. Both had this bleed effect, one full screen, the other only half of the screen. Added a picture for reference.
My guess is that everyone having these gradient / screen inconsistency issues is actually having this issue as well. Just test the phone by opening a bunch of black images in a dark room (or at night) and see if it doesn't light up in those areas. Bad batch of manufacturing maybe?
Funny thing is though that this ones battery is much better then the previous one. Last one was under a day with full charge, this one says 1 day and 17 hours... Same setup, same usage, same mileage.. What the hell microkia!
Edit: manufacturing date of this one is 23-6-2014