Darker horizontal shadow at the bottom of the screen (iMac 27" mid 2011) ??!!??!!?

Hello!
My screen has a darker horizontal shadow at the bottom,
it is more evident with white or gray background color.
does anybody know something about this defect?
tnx
iMac 27" 2,7 GHz, mid 2011
Snow Leopard

Apple Service, iMac Service or Apple's Express Lane. Do note that if you have AppleCare's protection plan and you're within 50 miles (80 KM) of an Apple repair station, you're eligible for onsite repair since yours is a desktop machine.

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