physicist says multiple factors affect picture quality. If you own a high-definition TV, don't read Edward Kelley's new tipsheet for folks in the market for plasma, LCD and other high-end displays. He doesn't want to ruin your day. Kelley is a physicist at the National Institute of Standards and Technology's Flat Screen Display Laboratory in Boulder. He wrote most of what one in the industry called "a bible" for the industrial testing and certification of flat-panel screens. Kelley's tipsheet opens sternly, with an all-caps warning. "SOME PEOPLE HAVE FOUND THAT THE FOLLOWING MATERIAL HAS REDUCED THEIR ABILITY TO ENJOY THEIR...