Viewsonics go #EXTREMESIXSIGMA crazy with their new monitors. Zero defective pixels allowed out of a total of 4 million / monitor. Their website explains how each of their 18″ SXGA LCD monitors that they produce has nearly 4 million sub-pixels.
Their return ( warranty ) policy will allow you to return a monitor in the first 3 months even if you find 1 bad pixel ! Very impressive.
Even 7 non-performing pixels would equate to an extremely small 0.00018 percent of the total sub-pixels.