Tested has written an overview of the dead pixel policies for every major LCD display maker, you can check out the article over here.
Today’s 1080p monitors pack a truly incredible number of pixels into a high-resolution liquid crystal display--more than two million, in fact. High-end monitors even exceed 1080p and tack on an extra million pixels or so. And, unfortunately, there’s a pretty good chance that one out of those two or three million tightly packed pixels will be a dud. It’s a gamble we all take buying a new LCD screen--probability gets us all eventually, leaving us with a gorgeous display marred by a few dead pixels.