Editing Contrast ratio (section)

== Dynamic contrast ==
[[File:Dimming Techniques.gif|thumb|Animated GIF showing a rudimentary representation of how various backlight dimming technologies work on a television. Dimming technology can drastically affect the contrast ratio of the display.<ref>{{cite web |url=https://techgearoid.com/articles/what-is-contrast-ratio/ |title=What is Monitor Contrast Ratio |last=Qazi |first=Atif|website=Tech Gearoid |access-date=Nov 29, 2019}}</ref>]]Some [[LED-backlit LCD|LED-backlit LCDs]] support technology called dynamic contrast (DC), also called advanced contrast ratio (ACR), smart contrast ratio (SCR),<ref>{{Cite web |date=2022-10-14 |title=Is ASCR Good For Gaming?/ A Must Read Complete Guide - zamahachu.com |url=https://zamahachu.com/is-ascr-good-for-gaming-a-must-read-complete-guide/ |access-date=2023-12-18 |language=en-US}}</ref> and various other designations. When there is a need to display a dark image, a display that supports dynamic contrast underpowers the [[backlight]] (or decreases the aperture of the projector's lens using an iris), but proportionately amplifies the transmission through the [[LCD]] panel; this gives the benefit of realizing the potential static contrast ratio of the LCD panel in dark scenes when the image is watched in a dark room. The drawback is that if a dark scene contains small areas of superbright light, the resulting image will be over exposed.

The trick for the display is to determine how much of the highlights may be unnoticeably blown out in a given image under the given ambient lighting conditions.

Brightness, as it is most often used in marketing literature, refers to the emitted luminous intensity on screen, measured in [[candela per square metre]] (cd/m<sup>2</sup>). The higher the number, the brighter the screen.

It is also common to market only the dynamic contrast ratio capability of a display (when it is better than its static contrast ratio only on paper), which should not be directly compared to the static contrast ratio. A plasma display with a 4,000,000:1 static contrast ratio will show superior contrast to an LCD (with LED or [[CCFL]] backlight) with 30,000,000:1 dynamic and 20,000:1 static contrast ratio when the input signal contains a full range of brightnesses from 0 to 100% simultaneously. They will, however, be on par when input signal ranges only from 0 to 20% brightness.