146:(SCR) and various other designations. When there is a need to display a dark image, a display that supports dynamic contrast underpowers the backlight lamp (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.
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measured at factory with two panels (one versus another) of the same model as each panel will have an inherent dark and light (hot) spot. Static is usually measured with the same screen showing half screen full bright vs half screen full dark. This usually results in a lower ratio as brightness will creep into the dark area of the screen thus giving a higher luminance.
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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
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may have a contrast ratio of 500:1, a transmissive digital projector is around 200:1, and a reflective digital projector (i.e. DLP) is around 500:1 under nearly ideal circumstances. A modern computer LCD monitor is typically at 1000:1, and TVs might be over 4000:1. Dynamic contrast ratio is usually
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is the luminosity ratio comparing the brightest and darkest shade 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
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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
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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
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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
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method of measurement, as it cancels out the effect of the room and results in an ideal ratio. Equal proportions of light reflect from the display to the room and back in both "black" and "white" measurements, as long as the room stays the same. This will inflate the light levels of both
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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.
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of the brightest shade (white) to that of the darkest shade (black) that the system is capable of producing. A high contrast ratio is a desired aspect of any display. It has similarities with
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This animated gif shows a rudimentary representation of how various backlight dimming technologies work on TV. Dimming technology can drastically affect the contrast ratio of the display.
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display, making it harder to distinguish between different devices with very high contrast ratios. How much the room light reduces the contrast ratio depends on the
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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.
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Some manufacturers have gone as far as using different device parameters for the three tests, even further inflating the calculated contrast ratio. With
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is the luminosity ratio comparing the brightest and darkest shade the system is capable of producing simultaneously at any instant of time, while
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part This practice is rather dubious, as it will be impossible to reproduce such contrast ratios with any useful image content.
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Brightness, as it is most often used in marketing literature, refers to the emitted luminous intensity on screen, measured in
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66:. Real rooms reflect some of the light back to the displayed image, lowering the contrast ratio seen in the image.
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contrast ratio, due to the need to take into account the extra temporal dimension to the measuring process.
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projectors, one method to do this is to enable the clear sector of the color filter wheel for the
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This article is about a property of a display. For a (different) definition for paint, see
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measurements proportionally, leaving the black to white luminance ratio unaffected.
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method effectively measures the dynamic contrast ratio of a display, while the
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of the display, as well as the amount of light reflecting off the display.
269:"Is ASCR Good For Gaming?/ A Must Read Complete Guide - zamahachu.com"
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156:(cd/m). The higher the number, the brighter the screen.
34:) is a property of a display system, defined as the
319:On practical contrast ratios in real environments
62:would be the same as the contrast ratio of the
245:Extensive coverage of practical contrast ratio
256:The Truth About Inflated HDTV Contrast Ratios
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85:Many display devices favor the use of the
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331:Contrast Ratio – The Useless Statistic
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241:www.practical-home-theater-guide.com
126:measures the static contrast ratio.
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291:"What is Monitor Contrast Ratio"
365:Powell, Evan (27 March 2008).
118:It is useful to note that the
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367:"Let's Ignore Contrast Specs"
353:Contrast - From Dark to Light
172:Contrast ratio in a real room
420:"Contrast Ratio of 2015 TVs"
101:part and disable it for the
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393:"Apple Thunderbolt Display"
229:Let's Ignore Contrast Specs
184:A clean print at a typical
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355:. Angles of View vol. III.
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154:candela per square metre
395:. Apple. Archived from
209:Glossary of video terms
140:advanced contrast ratio
108:Another measure is the
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81:Methods of measurement
74:dynamic contrast ratio
21:Contrast ratio (paint)
456:Television technology
329:HomeTheaterMag.com -
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134:An LCD technology is
130:Dynamic contrast (DC)
70:Static contrast ratio
371:ProjectorCentral.com
144:smart contrast ratio
451:Engineering ratios
336:2009-07-09 at the
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138:(DC), also called
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179:luminance
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376:11 March
334:Archived
193:See also
113:contrast
300:Nov 29,
38:of the
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64:device
103:"off"
60:image
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99:"on"
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