Someone can correct me but what I think causes the gray surface is that the pellets (pixels) can't be 100% opaque at that size, so regardless how white they are the black pellets shifted behind will still bleed thru to some extent, plus along the edges. Try taking a colored LED/laserpointer/flashlight and sticking it behind the skin between your thumb and forefinger and you'll see what I mean...
I don't mind the gray myself, as Lilac mentioned it is easy on the eyes... I would actually prefer a blacker black and increased resolution for better anti-aliasing (especially on serif fonts). But a darker black might, for the same reason as above, result in a darker gray background.
-MJ
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