The contrast ratio of a television is the difference between the brightest white and the darkest black it can produce. Dynamic contrast ratio refers to the television's contrast ratio when the television's base technology is augmented with other techniques, such as reducing the television's backlight to produce a darker black.
A television's contrast ratio can be mathematically expressed as white divided by black. If the television's brightest white produces 30 foot-lamberts of luminescence and its darkest black produces 0.001 foot-lamberts, its contrast ratio is 30,000:1. If this is achieved simply by means of the base display technology, such as basic LCD technology, then it is the television's native contrast ratio. If the contrast ratio is achieved by using techniques to augment the base technology, such as by automatically adjusting the brightness of the television's backlight in response to the image being projected, it is the television's dynamic contrast ratio.