My initial thought is display. Especially based on the bands of "normal" in between. These stripes almost certainly align with the cabling inside the display.
You can see what I mean a bit in this photo from a 13" model with the bottom bezel (where the MacBook Pro branding is) removed.
[image|2836220]
The best way to know for sure is to connect it to an external display. Normal video out is a dead ringer for it's a display issue.