Unfortunatley there is not much you will probally be able to do. Dead pixels are common amoung lcd's. sometimes you get lucky and do not have other times you can have 3 or 4. each manufacturer is different as far as what their warranty covers. Usually though they require X amount of dead pixels to qualify for replacement.

Stuck pixels are often incorrectly referred to as dead pixels, which have a similar appearance. In a dead pixel, all three sub-pixels are permanently off, producing a permanently black pixel. Dead pixels can result from similar manufacturing anomalies as stuck pixels, but may also occur from a non-functioning transistor resulting in complete lack of power to the pixel. Dead pixels are much less likely to correct themselves over time or repaired through any of several popular methods.