Contrast Ratio

The contrast ratio is a property of a display system, defined as the ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system is capable of producing. A high contrast ratio is a desired aspect of any display. It has similarities with dynamic range.

There is no official, standardized way to measure contrast ratio for a system or its parts, nor is there a standard for defining "Contrast Ratio" that is accepted by any standards organization so ratings provided by different manufacturers of display devices are not necessarily comparable to each other due to differences in method of measurement, operation, and unstated variables. Manufacturers have traditionally favored measurement methods that isolate the device from the system, whereas other designers have more often taken the effect of the room into account. An ideal room would absorb all the light reflecting from a projection screen or emitted by a CRT, and the only light seen in the room would come from the display device. With such a room, the contrast ratio of the image would be the same as the contrast ratio of the device. Real rooms reflect some of the light back to the displayed image, lowering the contrast ratio seen in the image.

Static contrast ratio is the luminosity ratio of the brightest and darkest color the system is capable of producing simultaneously at any instant of time, while dynamic contrast ratio is the luminosity ratio of the brightest and darkest color the system is capable of producing over time (while the picture is moving). Moving from a system that displays a static motionless image to a system that displays a dynamic, changing picture slightly complicates the definition of the contrast ratio, because of the need to take into account the extra temporal dimension to the measuring process.

Read more about Contrast Ratio:  Methods of Measurement, Dynamic Contrast (DC), Contrast Ratio in A Real Room

Other articles related to "contrast ratio, contrast ratios, ratio, contrast":

Contrast Ratio in A Real Room
... In marketing literature, contrast ratios for emissive (as opposed to reflective) displays are always measured under the optimum condition of a room in total darkness ... In typical viewing situations the contrast ratio is significantly lower due to the reflection of light from the surface of the display, making it harder to distinguish between different devices with ... How much the room light reduces the contrast ratio depends on the luminance of the display, as well as the amount of light reflecting off the display ...
Large-screen Television Technology - Display Specifications
... Contrast ratio This is defined as the ratio of the luminance of the brightest color to the luminance of the darkest color on the display ... High contrast ratios are desirable but the method of measurement varies greatly ... Static contrast ratio is measured on a static image at some instant in time ...
LCD Television - Comparison - Image Quality - Contrast Ratio
... This limits their contrast ratios to about 16001 on the best modern sets, when measured using the ANSI measurement (ANSI IT7.215-1992) ... Manufacturers often quote the "Full On/Off" contrast ratio instead, which is about 25% greater for any given set ... This lack of contrast is most noticeable in darker scenes ...
Bright Side Technologies
... can display true black and very bright white, with a contrast ratio technically of infinity, where minimal luminance is 0 cd/m² (the denominator) and maximal luminance is ... To address the confusion that may accompany a display with a quoted contrast ratio of infinity, Brightside calculates its quoted contrast ratio using the next-darkest level available on the ... display using it would be available Q2 2010 with 16 bits per color, and a contrast ratio of 1,000,0001 (19.9 stops) ...
OLED - Manufacturers and Commercial Uses - Samsung Applications
... OLED display concept, with a 1,280×768 resolution with infinite contrast ratio ... The contrast ratio is 100,0001, and the luminance is 200 cd/m² ... The panel has a contrast ratio of 1,000,0001, a colour gamut of 107% NTSC, and a luminance of 200 cd/m² (peak luminance of 600 cd/m²) ...

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