Nexus 5 Screen Issue

My Nexus 5 came in two days ago, but since using it I've noticed faint horizontal lines running across the screen (which almost look like fingerprint ridges), the effect is most noticeable on white backgrounds, but I can still see it on all displayed content. So, other Nexus 5 owners, is this normal? When the screen is off and under direct light, I can see the horizontal lines across the display, which makes me think that this might be attributed to the touch sensitive layer, but I've never seen this on any of my touchscreen devices before.