One solution to make dim or uneven display better on Macbook Pro

I just figured this out while I was playing with the settings. There was a white stripe on the bottom of the screen, also a bubble of white on the right bottom corner. After this "tweak" the bubble completely disappeared.
Apple menu
System preferences
Universal Access
Set contrast before the first mark, half way to it.
BAM, screen looks much better, and where's the white bubble? Disappeard..

Do you have any menu bar utilities that could be interfering? You can quit them to see if that makes a difference. What Mac do you have? I assume you mean the video display on your Mac gets messed up, not what you see on the TV.
Try turning on Mirroring, does that display correctly?

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