Indoor P3.91 Rental LED Full Color Display 500*500mm 500*1000mm

Indoor P3.91 Rental Full Color LED Display:
Air box (500*500mm one drag ten, 500*1000mm one drag six)
Module size: 250*250mm
Scanning mode: 1/13 sweep
Pixel pitch: 3.91mm
Pixel density: 65536 dots/m2
WhatisaLED?
LEDistheacronymofLightEmittingDiode,itisasemiconductorthatemitsvisiblelightwhenelectricitypassesthroughit.Theemissionoflightiscausedbyelectronsflowingbetweenanodeandcathodeandthecolorofthevisualemission(thatcanbeRed,Green,Blue,Amber,White…)dependingonthematerialused.Contrarily,tonormalincandescentbulbs,theLEDdoesnothaveafilamentandthiswarrantiesalongerlifeandamuchbiggerreliabilityregardingtraditionallamps.
WhatisaPIXEL?
Bydefinition,thepixelisthe"luminousdot"presentoneveryLEDsolution,fromasimplealphanumericalSingleLinedisplaytoFullColormaxi-screens.Thisluminousdotcanbeformedby1ormoreLEDsdependingondimensionsandfeaturesofthedevice.Forexample,onasmall-sizeSingleLinedisplay,thepixelisformedby1singleLED,whileonaking-sizemodelthepixelcanbeformedby20LEDs.Insomeproducts,thepixelcanbecomposedbyupto36LEDs.
Whatisa"dotpitch"?
ThepitchofaLEDdisplayexpresses,inmillimeters,thedistancebetweenpixels.ThismeasureisfundamentaltodeterminethecharacteristicsandperformanceofaLEDdisplay.Toknowadisplay'spitchisveryimportantsincethismeasuremarkstheminimumviewingdistance,themodule'sdefinitionandthereforethetotalLEDsdensitypresentonthedisplay,whichmeanstheresolution.Itisimportanttohighlightthatbyreducingthepixelpitch,theLEDdensityincreasesexponentially:forexample,reducingthepitchby50%,youcanhave4timesthenumberofpixelsonthesamesurface.
Pitch20mmPitch10mm
Totalpixels=9Totalpixels=36Pitch16mm
Totalpixels=16WhichisthedifferencebetweenSMDandPTHLEDs?
SMDistheacronymofSurfaceMountingDeviceanditisthenewfrontieroftheelectronictechnology:therevolutionbroughtbytheSMDtechnologyintothesectorisrepresentedbytheminiaturizationofalltheelectroniccomponents,includingLEDs.TheSMDcomponentsaremountedonthesurfaceoftheelectronicboard,without"passingthroughit"asanyotherelectroniccomponentutilizingtheformertechnology(calledPHT,acronymof"PlatingThroughHoles").TheSMDLEDisalsoplacedontheexternalpartoftheboardwithoutbothfilaments(anodeandcathode)havingtopassthroughit,asdescribedontheimagebelow(proportionsarereal):LEDsutilizingSMDtechnologyaredifferentfromcommonPHTLEDsforanotherveryimportantcharacteristic:thankstotheminiaturizationitispossible,infact,toplace3LEDsofdifferentcolorswithinthesamecase(asinthepictureonthetopright),resultinginathreecolorsLED.Thepossibilitytovisualizethreecolorsatthesametime(Red,GreenandBlue)onasingleLEDallowtocreatemaxi-screenswithaveryreducedpitch(distancebetweenpixels)andthereforetogetamuchhigherqualityimage.
PHTtechnologyLEDPHTtechnologyvs.SMDtechnologySMDtechnologyLEDWhatistheRESOLUTIONofadisplay?
Theresolutionisnothingelsebutthenumberofpixelspresentoneachm2.Theresolutionisthereforeoppositeproportionaltothepixelpitch:smalleristhedistancebetweentwopixels,higheristheresolution(becausethesurfaceofthescreenwillhaveahighernumberofLEDs).Forexamplea20mmpitchscreenhasaresolutionof2304pixels:thismeasureisobtainedbydividingthetotallengthofasinglemodule(975mm)bythepixelpitch(inthiscase20mm)resultinginthenumberofpixelsonasingleline:975:20=48pixels.Bymultiplyingthenumberofpixelspresentonasinglelinebythetotalnumberoflines,yougetasaresultthetotalnumberofpixelspresentonthescreen'ssurface,whichiscalledresolution.Inourexample,48x48=2304pixelsintotal.Giventhisformula,wefindoutthata30mmpitchscreenhasaresolutionof1024pixelspermodule,anda10mmpitchonehasaresolutionof9216pixelspermodule.Itisimportanttonoticethatreducingthepixelpitchbyonlyafewmillimeters,theLEDnumberincreaseexponentiallyandthereforetheresolution.
Module'sResolution3x3=9pixelsModule'sResolution6x6=36pixelsWhatistheDEFINITIONofadisplay?
The"definition"isthenumberofverticalandhorizontalpixelsthatareontheentirescreen.Forexample,somestandarddefinitionsare96x64pixels(=lowdefinition);256x192pixels(=mediumdefinition):640x480pixels(=highdefinition).ThedefinitionisthereforecloselyrelatedtotheLEDpitch,ordistancebetweenpixels.Tosimplifyandclarifytheterminology,wecansaythattheRESOLUTIONisreferredtoasinglemodule,whiletheDEFINITIONisreferredtotheentiredisplayonceallmoduleshavebeenassembled.
ScreenDefinition18x12=216pixelsScreenDefinition9x6=54pixelsWhat'sthedifferencebetweenscreenswithSAMEDIMENSIONSbutDIFFERENTDEFINITION?
Thedifferenceisthedistancefromwhichthedisplayshouldbeviewedtogetanoptimalimagequality.Thedisplaywithahigherdefinition(thesmallerpitchandthereforeabiggernumberofLEDsperm2)hasanimagequalityidealforshortviewingdistance.Thescreenwithalowerresolution(abiggerpitchandthereforeasmallernumberofLEDsperm2)hasontheotherhandalowerimagequality,idealforlongerviewingdistance.Itisimportanttoclarifythatthescreen'sdefinitionisdeterminedbytheviewingdistance:ifascreenwillbeobservedfrom300meters,itdoesn'tneedahighresolutionsincethehumaneyecannotdiscriminatesmalldetailsfromlongdistances.Ontheotherside,ascreenthatmustbeseenfrom30metersawayneedsahigherquantityofdetails(thereforeahigherresolution)sincefromsuchashortdistancethehumaneyeisabletorecognizeevensmalldetails.Tomakeacomparison,inthetablebelowarerepresentedtwohypotheticalscreensofthesamedimensions,butwithdifferentdefinition:thefirst(fig.1)hasahigherdefinitionandisidealforshortviewingdistances.Thesecondone(fig.2)ontheotherhand,hasalowerdefinitionanditisidealforlongerviewingdistances.Tobetterunderstandthisconcept,werecommendtolookatthepicturesfromfewcentimetersandthenfrom3metersawayfromthemonitor.
HigherDefinition-IdealforShortViewingDistanceLowerDefinition-IdealforLongerViewingDistanceWhataretheMINIMUMandMAXIMUMdistancesforwatchingaLEDscreen?
TheminimumandmaximumviewingdistancesofaLEDscreenaremeasureddependingontwofundamentalcharacteristicsonthedisplay,thepitchandthesurface:#1-theminimumdistanceiscalculatedconvertingintometersthenumberofmillimetersfoundatthepitch.Forexample,adisplaywitha10mmpitchwillbeseenfromtheminimumdistanceof10meters,a20mmpitchdisplayhasaminimumviewingdistanceof20meters.#2-themaximumdistanceinsteaddependsonthedisplay'sdimensionanditcanbecalculatedbymultiplyingx10andconvertingintolinealmetersthenumberofsquaremetersonthedisplay.Forexamplea4x3meters(=12m2)displaycanbeviewedfrom120metersdistance.Whentalkingaboutmaximumdistance,therearetwoconceptstoclarify,"readability"and"visibility":weunderstandas"readability"thedistancewithintheimagesbroadcastedonthescreenarereadable,thusclearlyrecognizable."Visibility"identifiesontheotherhandthedistancewithintheluminousdisplayisabletoattractthehumaneye'sattention,evenifimagesarenotperfectlyidentifiable.The"visibility"ofascreenisusuallythedoubleofits"readability"(inourformerexample:readability120meters=visibility240meters).Regardingwrittentexts,thereadabilitydependsonthefonts'size.Asageneralrulewecanaffirmthateverytextcentimetercanbereadfromabout5meterdistance.Forexample,a10cmhightextcanbereadfromabout50meters.
IsitpossibletovisualizeaVIDEOonaLEDdisplay?
Ofcourseitis.LEDdisplayshavetheirmainapplicationfieldinthe"live"videovisualizationduringconcerts,sportseventsandTVshows(onlylatersuchanadvancedtechnologyenteredtheadvertisingfieldtoo).Forthevideobroadcasting,itisimportanttokeepinmindthat,toobtainasatisfactoryqualityofthefinalimages,itisnecessarytoutilizeadisplaywithaminimumresolutionof192x128pixels.TheLEDdisplayisafterallacopyofaPCmonitorandthereforeitisabletovisualizeanythinglikevisualizedonthecomputermonitor(forexample,it'spossibletoseeaPC'sdesktop).
WhataretheCOLORLEVELS?
Colorlevelsarethe"palettes"thatanycolorcanhave.IntheLEDvisualizationfieldarekeptintoconsiderationthecolorlevelsofthethreeprimarycolors:Red,GreenandBlue.Thetotalnumberofcolorlevelsonadisplaydefinesthenumberofpalettesneededtopassfromthelowestlevel(opaque)tothehighestone(totallyvivid).
9colorlevels90colorlevelsWhatisthe16BITTECHNOLOGY?
Displaysutilizinga8bittechnologypercolor,thatdegradestheimageduringthevideoelaborationphase,areabletovisualize256colorlevelsforeachoneofthethreeprimarycolors.Thismeansthat256x256x256=16,8millionscolorscanbevisualizedintotal.LedLiteVision'sscreensinsteadutilizea16bittechnologypercolorthatallowstoelaboratevideoswithoutalteringthequalityinaperceptiblewayforthehumaneye.Afterthiselaboration(calledGammaCorrection)itispossibletovisualize65,000colorlevelsforeachofthethreeprimarycolors.Thismeansthatitispossibletovisualize65,000x65,000x65,000=280,000MILLIONcolorsintotal.
8bittechnology
256colorlevels
16,8millioncolorsWhatistheCOLORTEMPERATUREandwhyisitimportant?
AsaninternationalconventiondefinedbytheCIE(InternationalCommissionofIllumination)states,whileevaluatingthepropertiesofanysourceoflight,itisusedameasurethattakesintoaccounttheirchromaticcontent.Suchmeasureiscalled"colortemperature"anditisexpressedinKelvindegrees(°K).Lowlevelsofcolortemperaturecorrespondtocolortonesclosertored,whilehighlevelscorrespondtocolortonesclosertoblue.InLEDscreen,itisfundamentaltokeepconstantthesevaluestovisualizehighqualityimages.Ourcompany'sscreenshaveanelectronicsystemofcolors'equalizationthatdealswiththeseparametersautomatically,dependingontheenvironmentallighting,inordertoobtainalwaysaconstantcolortemperatureduringbothdayandnightperformances.
WhyisthePUREWHITEcreatedwithTHREELEDsofdifferentcolors?
Becausethehumaneyehas3typesofreceptorsfordailyvisionandeachoneofthemcorrespondtoaprimarycolor.Therestofthecolorsaretheresultofthesimultaneousstimulationofthesethreekindsofreceptors,throughaphenomenoncalledadditionsynthesis(whichmixesthechromaticcomponentscapturedbytheeye).Eachcolorisgeneratedbythemixofthethreeprimarycolors,indifferentpercentages.Thecolorofreference,thepurewhite,isobtainedbymixingthethreeprimarycolorsintherightpercentage(about50%green,30%redand20%blue).LedLiteVisiontechnologyallows,byvaryingthepercentagesofthesevalues,toobtain280millioncolors.Thishugechromaticpaletteguaranteesasuperiorimagequalityandanunbeatablevisualizationcapacity.
ChromaticityDiagramRGBvisualizationsystem
CIE1931Red-Green-BlueSMDTOPLEDrealpictureWhatistheVISIBILITYANGLE?
Thevisibilityangleofascreenisbyconventiontheanglewithinwhichthebrightnessofadisplayissuperiorby50%tothefrontalluminosity.Forexample,ascreenwith6000NITluminosity(NIT=candelasperm2)ifseenbythefrontwillhaveavisibilityangleequaltotheanglebywhichthebrightnessisreducedto3000NIT.ThisvisibilityanglecanvarydependingontheLEDusedandthedisplay'stechnicalfeatures.WhatistheIPrate(acronymofINGRESSPROTECTION)andwhatdoesitmeasure?
Thisistheprotectiongradeagainsthumidityanddustandit'sidentifiedas"IP"or"Ingressprotection).TheIPlevelisdescribedbytwofigures.Thefirstoneisreferredtotheprotectionlevelagainstdust,thesecondoneagainstwater.TheIngressProtectionlevelisaninternationalstandardutilizedtomeasurethewaterproofconditionofanyelectronicproduct.DeviceswithahigherIPlevelkeeptheinternalcomponentssafeandclean.Ourcompany'smaxiscreensguaranteeaIP65level,whichmeansthehighestreachablelevelintheLEDvisualizationfield.InthetablebelowaresummarizedthedifferentIPlevelsandtheirmeaning.
IPlevelstableWhatistheVIRTUALPIXELTECHNOLOGY?
TheVirtualPixelisatechnologyofimagemanagementthatallowstovisualizepicturesofadefinitionhigherthanthephysicalone,thankstoatechniquecalled"pixelinterpolation".LedLiteVision'sVirtualPixeltechnologyisabletocontroleveryLEDindividually:thisuniqueandexclusivescreenmanagementallowsoverlyingeachpixeltothenextone,creatingaso-called"VirtualPixel"thatmeansapixelthatdoesnotexistbutitisperceptiblebythehumaneye.Aswesaidbefore,thescreen'sdefinitionisoneofthefeaturesthatdefinetheimages'qualityandbeauty:higheristheresolution,higheristhepicture'squality.Ourcompany'sscreenswithVirtualPixeltechnologycanvisualizeimageswithadefinitionfourtimeshigherthanthephysicaldefinitionofthedisplay;andtherefore,imagesaremoredetailedandreal.
PhysicalDefinitionVirtualDefinition
WithoutVirtualPixelTechnologyWithVirtualPixelTechnologyWhatistheREFRESHRATEandwhyisitimportant?
Therefreshrateindicatesthenumberoftimesthattheimagerefresheseverysecond.Forexample,aPCmonitorhasa"refreshrate"of72Hertz(Hz)andthereforeitrefreshesallthepixelsofthescreen,fromtoptobottom,72timeseverysecond.Therefreshrateisfundamentalsinceitdeterminestheimage'squality:ifitistoolow,thehumaneyecanseeaflickerthatcausesheadacheanddamagetooureyes.Toprovideacomparison,mostoftheTVmonitorshavearefreshrateof50Hzandonlyafewlastgenerationtelevisionshavea100Hzrefreshrate.LedLiteVision'sscreenshavea240Hzrefreshrate,whichisalmostthreetimeshigherregardingthemostadvancedcathodetubetechnologies.ThisfeatureisanotherproveshowingLedLiteVision'qualityandthestate-of-the-arttechnology,resultofmanyyearsresearchingandtestinginsitu.WhatistheCONTRASTLEVEL?
It'sthedifferencebetweenthelightemittedbythescreenandtheenvironmentallightreflectedbythedisplay'ssurface.Minoristhelightreflected,higheristhecontrastandthereforethecleanlinessofimages.ToincreasethecontrastLedLiteVision'sscreensadoptsomeparticularanti-reflexflyersthatsplittheenvironmentallightandreflectitindifferentdirections,increasingthevisibilityofthescreenevenindirectSunlightexposition.DoLEDsreallyhavealifespanof100,000hours(or11years)?
Toguaranteea100,000hourslifetime,LEDproducersstateclearlytwofundamentalconditionsthatmustberespected,theinternaltemperatureandthepowerintensity.ThesemeasureshavedifferentvaluesdependingontheLEDtypeandthemanufacturer,buttoprovidealimitofcomparisonwecansaythat:#1-theLEDinternaltemperaturemustbebelow120°C(measuredina25°Cenvironment)#2-thepoweronwhichtheLEDworksmustbebelow20mA.Ifbothconditionsaremaintained,theLEDproducerguaranteesthatafter100,000hours(about11yearsalwaysturnedon)theLEDbrightnesswillbereducedby50%regardingtheinitialvalue.Keepinginmindtheimportanceoftheseparameters,LedLiteVisionhasinvestedintechnologicalsolutionsabletomanagethesevaluescorrectlyandautomatically,andkeepthemconstantduringthewholedevicelife.LedLiteVisionproductsarealsoabletoverifythemwithaseriesofrelateddevicesandcontrolsas:#1aspecialforcedventilationelectronicsystemelectronicallycontrolled,#2aspecificchipthatmanageseverysingleLEDandonwhichacertainpowerphaseisdefined,#3aspecialheatdissipationsystem.
WhatistheMODULARSYSTEM?
ItisasystemthatallowstobuildbigLEDscreensassemblingseveralmodules,dependingonthecustomer'sspecificneeds.LedLiteVision'smoduleshavedifferentsizes,dependingontheapplicationandtheyareputtogetherusinganauto-centeringsystemusefulforkeepingtheperfectpixelalignmentbothhorizontalandverticalwhichguaranteesaperfectimagevisualization.LedLiteVision'smodularsystemoffershugevantages:itallowsaneasytransportationandasimplemountingprocedure(thankstotheindividualmodule'slightweightandreduceddimensions),itallowsaneasymaintenance,doesn'tputanylimitinshape,sizeandresolutionandmoreoverallowsafuturescreenupgrade.
baseModule975x975x125mmModularSystem
WherecanIfindsomeSPAREPARTS?Witheachscreen,LedLiteVisionprovidesanumberofspareparts,freeofcharge,enoughtocoveranyfailureduetoanormaluse.Also,anyreparationmadewithinthewarrantyperiodwillbetotallyfree.WhatarethedifferencesbetweenINDOORandOUTDOORscreens?
Fromageneralpointofviewthedifferencebetweenindoorandoutdoorscreensarethefollowing:#1-lowerresolution:astheoutdoordisplaysareusuallywatchedfromlongerdistances,theydonotneedaveryhighresolution.Thecostforabigscreenisthereforecompensatedbythelowerresolutionneededtoprovideagoodimagequality.#2-protectionagainstweather(IP65protectiongrade)andcoolingsystem:screensaretreatedwithaparticular"tropicalization"techniquethatguaranteesanexcellentresistancetowater,saltyairandcorrosiveintrusionstypicalofoutdoorinstallations.Moreoveraspecialforced-ventilationsystemguaranteesthatthetemperatureinsidethescreenremainsconstantandneverpassesthecriticallevels.#3-against-sunandagainst-vandalismprotectionsystem:outdoorscreenshaveaspecialprotectionsystemthathasthedoublefunctionofprotectingthescreensfromthesun(increasingthecontrastlevelsandobtainingabetterimage)andfromvandalismacts.#4-higherbrightness:theoutdooruserequireshighbrightnessLEDcomponentsinordertobevisiblefromlongerdistancesandmostofallabletocontrastthedirectsunlight.
CanyouvisualizeimagesonBOTHSIDES?
Notonasinglescreen.LEDscreenshaveasupportcalledprintedcircuitorelectroniccard,andtheyarefixedononesingleside.Toseeimagesonbothsidesitisnecessarytohavetwoscreens,standingoneagainsttheotherbytherearside.
WhatisthePORTABLESTRUCTUREofaLEDwall?
LEDgraphicdisplaysareinstalledwithdifferentcarryingstructuresdependingontheapplication.Theycanbeinstalledon:
trucks
onabuildingorstructure'swall
onstands
onwood
ontrusses
hangingfromawire
DoyouneedpermissionfromthelocalCityHall?
Yes.ForinstallingamaxiLEDscreenitisnecessarytoaskforthelocalcouncil'spermissionwhereyouaregoingtoplacethedevice.Theentitiestakingchargeofthisarealwayslocal,andthereforeitisimpossibletodefineageneralregulation,sincelawsvaryaccordingtoeachgovernment.
HowmuchdoesaLEDconsumeswhenON?
ALEDconsumptiondependsonthemanufacturer,onthediode'scolorandthepowerpassingthroughit.AsarepresentativetitlewecansaythataLEDconsumptionisbetween15and100ma(milliamperes)anditspowercanvaryfrom0.1to1Watt.