I'm 99% certain the display is a backlit LCD. If the "smear" you see is dark in color it's likely one of two things. Either oxidation of the the aluminum reflector on the back of the LCD. This actually can be repaired on an LCD, but it's not for the faint of heart and not without risk of damaging it further.
The other thing that it could be is a crack in one of the layers of the LCD where the actual liquid crystal has leaked and become opaque.
|