What is the dynamic contrast of the LCD screens?
For Digital Future | August 26, 2008
A recent development in LCD technology is called dynamic contrast. When the screen will display a dark image, diminishes the power of the lamp backlight (or decreases the opening of the lens through an LCD projector's iris), but proportionately amplifies the transmission through the LCD panel. This process darkens the entire image, turning the brightness range lower in absolute black and brightness highest loses intensity. Then the signal is amplified, so the shine returns to its previous state, but there is a part of previous brightness very close to 0 (black) that now is black and so much remains to be amplified black.
This system has the benefit of playing with the light inside of the screen, one of the elements that play more against the LCD screens. The drawback is that it shows a dark scene contains small areas of very bright light, the final image can be over-exposed, that is the bright light would be brighter still.
In-store show us the contrasts and dynamic variety of televisions, but we can not directly compare a value with the other.
A plasma display with a static 5000:1 contrast ratio will display a higher contrast to an LCD screen with 5000:1 dynamic contrast ratio of 1000:1 static contrast, provided they show high levels of brightness from 0 to 100%. However, the contrast dynamic display that has a higher contrast when the input signal ranges only between 0% and 20% brightness.
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