Sadly, this sort of issue generally ends in one of two outcomes. Either the screen is damaged and needs to be replaced (best case scenario) or the graphics processor is dying, which I don't believe can be replaced without changing the entire laptop mainboard. (I could be wrong about that, as my expertise lies mainly with desktops.)
As a "Hail Mary," try updating your video driver. http://us.acer.com/ac/en/US/content/driv...
If that doesn't work, it may be time to replace the screen. Try taking it to a computer repair shop to see if they can test it to see if either the screen or the graphics processor is faulty. You might be able to go from there.
My bet is that the screen is broken. Don't fret, (well, not TOO much) it is entirely possible to replace it yourself. The trick will be finding a replacement. Good luck!
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