I know this is old but this is just now happening to my tv and the purple is spreading. I was just the top and bottom right corner but now theres a spot in the middle. And they're not little, prob bout the same size as yours. This is my second Samsung TV in 6 yrs. The first one the screen got vertical rainbow lines and eventually took over the tv. Had to be replaced so I got a good deal on a 55 curved Samsung TV. I went with them again bcz I love how the screen looks compared to others and it has a dimming feature I sure alot so I don't have to go into pic setting and change things indiv everytime. But after this tv, it will be my last Samsung. This one didn't even make it 4yrs. I haven't replaced it yet, gonna wait till it's unbearable.
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