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Dynamic contrast

Dynamic contrast refers to both an LCD technology and a technique for measuring an LCD's contrast ratio. As a means by which to display very dark darks (for example, when the majority of the image being displayed is composed of dark colors), the LCD TV actually actively reduces the power of the backlight lamp or tightens the output stream like an aperture in a camera. This darkening of the low area is combined with a heightening of the intensity of hot spots. While this does result in darker darks, it can also lead to unnecessarily bright hot spots. In the process of determining an LCD's contrast ratio, dynamic contrast ratio refers to measuring the difference between the display presenting full bright and full dark. This is used in marketing LCD TVs because the dynamic contrast ratio will always be higher than the static contrast ratio.

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