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Why are they more an issue recently? One word: China.
Or, more elaborately, cheap Chinese LCD screens made with the sort of quality control you'd expect in a late '70s Chrysler.
Early LCDs often had bad pixels, but the Japanese and Koreans seem to have gotten the problem under control. (needless to say there are no US producers of consumer-grade screens)
Way more annoying than an off pixel is one that's stuck on. I got a new cheap screen for my secondary computer, and it had a BRIGHT GREEN on-pixel stuck in the upper left quadrant. It went back.
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