Is it visible all the time? Is it most visible against uniform backgrounds? Does it resemble a negative image of part of an app you've used a lot?
I'm asking those questions because the second image, a fuzzy shape on a solid background, makes me wonder about screen burn-in (the first image is just black as far as I can see). Though burn in shouldn't be visible against a pure black background, since it's due to LEDs losing brightness (so when they are off anyway, i.e. on a black image, it should make no difference).