Contrast ratio is another weakness.
LCD screens usually can't produce dark tones as well as plasma, because
some glow from the fluorescent backlight always leaks through the
screen. With grayish blacks, the ratio of light to dark is reduced, and
LCD images lack the depth found on plasma. But Sharp claims its new TVs
hit a contrast ratio of 15,000 to one by dimming the backlight as
needed. Plus, the faster pixels can shut down all the way before
switching to the next frame of video. Samsung bested this performance
by using a grid of light-emitting diodes as a backlight. It can
selectively brighten or dim the lights behind different parts of the
screen to deepen shadows and brighten highlights. With it Samsung
claims a 100,000 to one contrast ratio, and its side-by side comparison
of old and new technologise was dramatic. But Sharp doesn't take that
lying down. Using undisclosed technology, it demonstrated a prototype
TV that hits a million to one ratio.