From the stories those black blotches you're talking about is because oled was new and not really matured unlike now.I have the day vita with the OLED screen. Turns out that screen is prone to spotting. You can really only see it when solid black is displayed. During regular gameplay, I don’t notice it much. I found that the spotting is normal on this type of screen. I was thinking of getting a newer vita. Maybe I would, once the new hack gets released.
From the stories those black blotches you're talking about is because oled was new and not really matured unlike now.
OLED was new back when the vita was announced and released. Phones from 2011 suffered the same issues.The O stands for Organic & they rot, especially if exposed to moisture. The advances mostly seem to be in trying to stop any kind of moisture getting in.
I've avoided OLED, it seems fine if you have it on your phone and you're the type of person who throws out their old one every three years. I am not one of those people.