It's almost certainly not covered under warranty. The spec for an 'acceptable' number of dud pixels is usually ~5, depending on the total number of pixels on the screen (i.e. it would be a higher number for a higher resolution screen). Some manufacturers also disregard anything that isn't 'central' (they define 'central') so a dead pixel in a corner of the screen often doesn't count.
Sunnystaines: you certainly see far fewer of them these days as the panel fabrication process improves, but 100% of panels with 100% of pixels working and continuing to work for several years is still not quite with us.
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