burn-in effect?

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http://forum.xda-developers.com – hey, i noticed something strange on my phone. when i'm in an app like this for a short time (also whatsapp, facebook, etc...) and then switch to my homescreen, which has a dark, mono colored background, i can see something like a slight shadow of the previous screen overlaying the screen i'm on. i showed it to a friend and he also saw it, without seeing the previous screen so i'm assuming that it's not just my eyes. especially the keyboard becomes strongly visible after a while of whatsapping and then switching to the homescreen. the effect is not permanent, it disappeares after little time (HowTos)