One of the most heavily advertised statistics for LCD flat-screen televisions is the contrast ratio. Usually made up of improbable numbers, they purportedly reflect the difference between the brightest white that a set can display and the darkest black, with a 1,000,000-to-1 set showing whites that are a million times brighter than blacks, and a 10,000-to-1 set showing whites that are 10,000 times brighter than blacks. However, between the fact that contrast ratios aren’t measured consistently across brands and that the eye perceives a 1,000-to-1 contrast ratio, which is less than any new LCD TV, the statistic is meaningless, so there’s no magic, good number....