Image persistence - Wikipedia

Image persistence, or image retention, is the LCD and plasma display equivalent of screen burn-in. Unlike screen burn, the effects are usually temporary and ... Imagepersistence FromWikipedia,thefreeencyclopedia Jumptonavigation Jumptosearch TemporaryeffectonLCDandplasmascreens TFTdisplayshowingpersistenceartifacts DetailofaTFTdisplayshowingwholescreenpersistenceartifacts Imagepersistence,orimageretention,istheLCDandplasmadisplayequivalentofscreenburn-in.Unlikescreenburn,theeffectsareusuallytemporaryandoftennotvisiblewithoutcloseinspection.Plasmadisplaysexperiencingsevereimagepersistencecanresultinscreenburn-ininstead. Imagepersistencecanoccuraseasilyashavingsomethingremainunchangedonthescreeninthesamelocationforadurationofeven10minutes,suchasawebpageordocument.Minorcasesofimagepersistencearegenerallyonlyvisiblewhenlookingatdarkerareasonthescreen,andusuallyinvisibletotheeyeduringordinarycomputeruse. Contents 1Cause 2Preventionandtreatment 3References 4Externallinks Cause[edit] Liquidcrystalshaveanaturalrelaxedstate.Whenavoltageisappliedtheyrearrangethemselvestoblockcertainlightwaves.Ifleftwiththesamevoltageforanextendedperiodoftime(e.g.displayingapointerortheTaskbarinoneplace,orshowingastaticpictureforextendedperiodsoftime),theliquidcrystalscandevelopatendencytostayinoneposition.Thisever-so-slighttendencytostayarrangedinonepositioncanthrowtherequestedcoloroffbyaslightdegree,whichcausestheimagetolooklikethetraditional"burn-in"onphosphorbaseddisplays.Infact,therootcauseofLCDimagepersistenceisthesameasphosphorburn-in,namely,non-uniformusageofthedisplay'spixels. Thecauseofthistendencyisunclear.ItmightbeduetoaccumulationofionicimpuritiesinsidetheLCD,electricchargebuildingupneartheelectrodes,[1][2]parasiticcapacitance,[3]or"aDCvoltagecomponentthatoccursunavoidablyinsomedisplaypixelsowingtoanisotropyinthedielectricconstantoftheliquidcrystal".[4] Preventionandtreatment[edit] Imagepersistencecanbereversedbyallowingtheliquidcrystalstorelaxandreturntotheirrelaxedstate,suchasbyturningoffthemonitorforasufficientlylongperiodoftime(atleastafewhours).Formostminorcases,simplycontinuingtousethecomputerasusual(andthusallowingothercolorsto"cover"theaffectedregions)orturningoffthemonitorforthenightismorethanenough.Onestrategyforuserslookingtoavoidimagepersistenceartifactsistovarytheactivitiesperformedonacomputertoavoidstaticcolorsandhideelementsonthescreenwhicharedisplayedperpetually(suchasanOS'sTaskbar).Anotherstrategyistheusageofascreensavertohelpduringtimesthecomputerisleftunattended.Coveringtheentiredisplayareawithpurewhiteforanextendedperiodoftimeisalsoausefulproactivesolution.[5][6] References[edit] ^Imagepersistence:LCDmonitorsArchived2008-12-27attheWaybackMachine.MitsubishiElectric,January2006(?) ^WHITEPAPERLCDtechnologyandimageretentionArchived2016-05-23atthePortugueseWebArchive.KoninklijkePhilipsElectronicsN.V.©2009 ^PixelsandImageSticking.TycoElectronicstechnicalsupport(pre-2008) ^K.Kusafuka,H.ShimizuandS.Kimura,Drivingmethodforgate-delaycompensationofTFT/LCD. IBMJournalofResearchandDevelopment,Volume42,Numbers3/4,1998 ^"AvoidingimagepersistenceonAppleLCDdisplays".Apple.Retrieved18Oct2013. ^"Archivedcopy"(PDF).Archivedfromtheoriginal(PDF)on2020-09-21.Retrieved2018-10-05.{{citeweb}}:CS1maint:archivedcopyastitle(link) Externallinks[edit] ArticleonLCDimagepersistence Retrievedfrom"https://en.wikipedia.org/w/index.php?title=Image_persistence&oldid=1070467149" Categories:DisplaytechnologyLiquidcrystaldisplaysHiddencategories:WebarchivetemplatewaybacklinksWebarchivetemplateotherarchivesCS1maint:archivedcopyastitleArticleswithshortdescriptionShortdescriptionmatchesWikidata Navigationmenu Personaltools NotloggedinTalkContributionsCreateaccountLogin Namespaces ArticleTalk English Views ReadEditViewhistory More Search Navigation MainpageContentsCurrenteventsRandomarticleAboutWikipediaContactusDonate Contribute HelpLearntoeditCommunityportalRecentchangesUploadfile Tools WhatlinkshereRelatedchangesUploadfileSpecialpagesPermanentlinkPageinformationCitethispageWikidataitem Print/export DownloadasPDFPrintableversion Languages Addlinks