I came across a forum thread at SurfaceForums.net that discusses an issue with some Surface Pro 3 screens, mine included. As user T.J. Godin notes:
I remember reading about this issue on the first gen Surface Pro, but I believe history may be repeating itself with the Surface Pro 3. I had my unit for 2 weeks when I began to notice it, in particular when web browsing with white backgrounds.
So, I exchanged my unit and now believe even my new unit may have the beginnings of the same issue – only a few days into using it. It is a very faint hazy yellow vertical line, maybe a quarter of an inch wide along the left side of the screen. Makes me wonder if there is a component behind the screen which is heating up causing it. (I’ve seen that before on Lenovo tablets) [sic]
After reading this entry and checking out my Surface Pro 3, I see what’s being discussed here. I can’t see what’s causing it, but I’ll note that there’s some distortion in the screen at this location when pressure is applied (say, when cleaning with a microfiber cloth). The distortion can only be seen on black screens (but with the backlight on, e.g., when the machine is booting), and this is precisely where the “yellow haze” (or on non-white screens, a discoloration of whatever color is being displayed) is seen on a lit screen. It’s logical to conclude that the two issues might be related.
I’d be tempted to call this backlight bleeding, but it’s very uniform across the entire length of side and there appears to be a cap between the line and the edge of the screen. If you have a Surface Pro 3, does your screen have this issue?