[grock]

ive had this problem b4 on touch devices... im going to assume, that you have big fingers like i do, and that you have pressed to hard on the screen and damaged it thus resulting in a color bleed, ive done this to 2 of my ipods over the years by getting pissed and trying to do a reset and it not reseting, and getting even more pissed and attempting to reset in a more physical manor thinking it wasnt registering me hitting the buttons

just my 2 cents, damn my potato fingers