the reason that you do still see some "backlight" when the screen is black and on full brightness is because of the TFT backplate used in the Super AMOLED display. The transistors used need to still keep a "slight" charge in order to redraw the images on the screen faster, otherwise there would be a slight delay in you doing something on the screen and the screen actually drawing it. So that slight power going through the transistor is causing that slight glow you see on an all black screen. I belive that the reason you cant see the "black" pixels in the OP's picture is because the camera adjusted for the brightness making the really dark pixels look darker to prevent the "bright" pixels from being too bright. I know this seems like a dumb source but i got this info from wikipedia lol
While I'm no Wikipedia-basher I don't think the TFT backplate thing would *normally* cause this issue. But since you made me doubt myself (and I currently have nothing to do at work) I got out the DSLR and the optical scope in the lab....
With no illumination and 10 seconds worth of exposure I still don't see ANY light from the pixels. I'd post the resulting picture, but it's nothing but black and noise.
EDIT: Here it is. Left is 10 second exposure unadjusted - right is with the Exposure, Brightness and Contrast upped enough that you can start making out the edges of the pixels. If the camera couldn't catch any light I doubt a human eye could.
Once I turned on some side illumination things got interesting...
The upper portion is illuminated while the lower portion is black. I don't see any light from the lower part at all.
LED's have a minimum voltage before they start to light (e.g. 1.0V = off, 1.1V = off, 1.2V = off, 1.3V = 5% 1.4V = 10%, and so on). If I were a betting man I'd say that the voltage wikipedia speaks of is probably close to the threshold but just not quite enough to cause illumination. Perhaps he keeps getting phones with slightly low tolerance resistors that let that voltage get just past the threshold.
Who knows...