luckily, my n9 doesn't seem to have the black thingy

i set my n9's brightness to lowest, then tested camera app in a dark room, and even watched a movie with dark scenes, yet still, no black thingies were sited. yey.

i also dont have the purple and green lines unless of course the screen is like 5inches from my eyes...

i think they're normal since the screen of n9 is AMOLED... the pixels are arrange in a rgbg pattern.. and because of that, color display is not as vivid and as crisp compared to the lcd and superamoled+.. so it's normal that white will appear a bit dirty.

if your n9 has those black thingies, you can return them to nokia stores and they'll glady replace or repair it since it's a factory defect.

they're like the air blobs in the screen protectors, but only visible when it's dark. maybe they're the results of a faulty "gluing" method during the process of making the amoled screens.