Why does my screen flash crazy red streaks when i open it up?

Lately every time i open my screen up it has red flashing and it looks like fog all across my screen, red fog and if i flip the screen open more and close it a few times it eventually goes away but the problem seems to be getting progressively worse.  Any  idea whats going and or suggestions?!

My Mac Unibody 2009 does this too. I am out of warranty. Any ideas on what is causing this? Any help appreciated!
Red flickering goes from a very pale to a pretty bright opacity and at first was intermittent, now all the time and especially noticeable where white or a very pale color is the predominant background color.
I would like to know if it could be repaired or if the repair cost is going to be so high that I would be better off buying a newer model.
Thanks
Helen

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