What is the difference between original and dynamic contrast ratio contained by an HDTV?
Answers: Native contrast is the ratio of brightest white (say 450 nits) over the darkest black - for a fixed intensity of the backlight
Dynamic contrast is the ratio of brightest white - with brightest backlight - over darkest black near darkest possible backlight.
Dynamic contrast is meaningless but unfortunately is one used..
Rule of thumb: Dynamic contrast = 5x native contrast
Most society can't tell the difference above a contrast of a thousand (humans hold ~30 dB of instantaneous dynamic range, from Wikipedia), and if there's any ambient flimsy, the net contrast will be something drastically different, utter 200-300. But this is still much better than the contrast that tube displays would get contained by a similar situation.
In a dark room, beside a dark scene, those greater contrast numbers might start to become more important, but you're more probable to notice a 'non-whiteness' to the black the the TRUE level of it.
Unless you're a super video afficianado, as coryphaeus said, I wouldn't verbs about it, or I'd verbs more about the black color coordinates than super soaring contrasts.
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