MacBook PRO has vertical lines in display

I have a problem. My display has weird coloration and vertical lines mostly on the right side of the screen. When I attach to an external monitor, they do not show... I'm told this indicates a software issue as opposed to a hardware issue. The other thing... when I tilt the screen so that there is less than 90 degree angle between screen and keyboard, everything looks fine. I'm attaching two pictures. I hope somebody can help. The first shows the weird colors and stripes/bars on the right. The second shows how it looks when I tilt the screen forward.