Image persistence

Image persistence

Image Persistence is the term used for the LCD and plasma display equivalent of screen burn. Unlike screen burn, however, the effects are most often only temporary. It should be noted however, that plasma displays can also suffer from burn-in.

Cause

Liquid crystals have a natural relaxed state. When a voltage is applied they rearrange themselves to block certain light waves. If left with the same voltage for an extended period of time (e.g. displaying a mouse cursor or the Microsoft Windows Taskbar in one place), the liquid crystals can develop a tendency to stay in one position. This ever so slight tendency to stay arranged in one position can throw the requested color off by a slight degree, which causes the image to look like the traditional "burn-in" on phosphor based displays.

The actual cause for this tendency is unclear. It might be due to accumulation of ionic impurities inside the LCD [ [http://www.plasma-usa.com/screen%20burn/White_Paper_onscreenburn_NEC.pdf Recommendations for reducing image persistence on large-screen LCDs] . NEC Whitepaper, 2005.] , electric charge building up near the electrodes [ [http://www.mitsubishi-presentations.com/pdf/MIT_MDTLCD_IMAGE_PERSISTENCE.pdf Image persistence: LCD monitors] . Mitsubishi Electric, January 2006 (?)] , parasitic capacitance [ [http://www.elotouch.com/Support/TechnicalSupport/pixels_image.asp Pixels and Image Sticking] . Tyco Electronics technical support (pre-2008)] , or "a DC voltage component that occurs unavoidably in some display pixels owing to anisotropy in the dielectric constant of the liquid crystal". [K. Kusafuka, H. Shimizu and S. Kimura, [http://www.research.ibm.com/journal/rd/423/kusafuka.html Driving method for gate-delay compensation of TFT/LCD] . IBM Journal of Research and Development, Volume 42, Numbers 3/4, 1998] .

Prevention/Treatment

This is easily preventable and can be reversed by allowing the liquid crystals to return to their relaxed state. In other words, turning off an LCD display for as little as 15 minutes a day will relax the crystals and help prevent image retention. For PC monitors, it is also ideal to rotate desktops, and hide away elements on the screen which normally would be displayed perpetually (like the taskbar in Microsoft Windows or the Dock in Mac OS X). The usage of a screensaver that has a constantly changing image can help as well.

The fastest remedy for image persistence is to leave the display off for an extended period of time. This time can range anywhere from hours to days. Another useful approach to removing LCD image persistence is to first create a solid white image and display the image as a screensaver covering the entire display area for an extended period of time. [http://docs.info.apple.com/article.html?artnum=88343]

References

External links

* [http://compreviews.about.com/od/monitors/a/LCDBurnIn.htm Article on LCD Image Persistence]


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Persistence — may refer to: * Persistence (computer science), the characteristic of data that outlives the execution of the program that created it * Persistence (meteorology), the meteorological phenomenon by which weather remains relatively unchanged over… …   Wikipedia

  • Persistence of vision — is the phenomenon of the eye by which even nanoseconds of exposure to an image result in milliseconds of reaction (sight) from the retina to the optic nerves. This is because persistence of vision depends on chemical transmission of nerve… …   Wikipedia

  • Persistence (computer science) — This article is about state outliving processes. For immutable data structures, see Persistent data structure. Persistence in computer science refers to the characteristic of state that outlives the process that created it. Without this… …   Wikipedia

  • persistence of vision — a visual phenomenon that is responsible for the apparent continuity of rapidly presented discrete images (as in motion pictures or television) consisting essentially of a brief retinal persistence of one image so that it is overlapped by the next …   Useful english dictionary

  • persistence of vision — per·sis·tence of vision pər sis tən(t)s , zis n a visual phenomenon that is responsible for the apparent continuity of rapidly presented discrete images (as in motion pictures or television) consisting essentially of a brief retinal persistence… …   Medical dictionary

  • Persistence — Persistance Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom …   Wikipédia en Français

  • persistence of vision — the retention of a visual image for a short period of time after the removal of the stimulus that produced it: the phenomenon that produces the illusion of movement when viewing motion pictures. [1900 05] * * * …   Universalium

  • The Persistence of Memory — This article is about the painting by Salvador Dali. For the novel by Tony Eprile, see The Persistence of Memory (novel). The Persistence of Memory Artist Salvador Dalí Year 1931 ( …   Wikipedia

  • The Disintegration of the Persistence of Memory — Infobox Painting| backcolor=#FBF5DF painting alignment=right image size=300px title=The Disintegration of the Persistence of Memory artist=Salvador Dalí year=1952 1954 type=Oil on canvas height=25.4 width=33 height inch=10 width inch = 13… …   Wikipedia

  • Java Framework de persistence — Persistance (informatique) Pour les articles homonymes, voir persistance. En programmation, la gestion de persistance des données (en anglais : persistence) et éventuellement des états de programme se réfère au mécanisme responsable de la… …   Wikipédia en Français

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”