IEC 62977-2-8 2025.docx

IEC62977-2-8Edition1.02025-06INTERNATIONALSTANDARDElectronicdisplays-Part2-8:Measurementsofopticalcharacteristics-Reflectivedisplays(U)90%0eweN6e9Om-ICS31.120；31.260ISBN978-2-8327-0416-5THISPUBLICATIONISCOPYRIGHTPROTECTEDCopyright©2025IEC,Geneva5SwitzerlandAllrightsreserved.Unlessotherwisespecified,nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromeitherIECorIEC'smemberNationalCommitteeinthecountryoftherequester.IfyouhaveanyquestionsaboutIECcopyrightorhaveanenquiryaboutobtainingadditionalrightstothispublication,pleasecontacttheaddressbeloworyourlocalIECmemberNationalCommitteeforfurtherinformation.IECSecretariatTel.:+412291902113,ruedeVarembeinfoiec.chwww.iec.chCH-1211Geneva20SwitzerlandAbouttheIECTheInternationalElectrotechnicalCommission(IEC)istheleadingglobalorganizationthatpreparesandpublishesInternationalStandardsforallelectrical,electronicandrelatedtechnologies.AboutIECpublicationsThetechnicalcontentofIECpublicationsiskeptunderconstantreviewbytheIEC.Pleasemakesurethatyouhavethelatestedition,acorrigendumoranamendmentmighthavebeenpublished.IECpublicationssearch-webstore.iec.ch/advsearchformTheadvancedsearchenablestofindIECpublicationsbyavarietyofcriteria(referencenumber,text,technicalcommittee,.).Italsogivesinformationonprojects,replacedandwithdrawnpublications.IECJustPublished-webstore.iec.ch/justpublishedStayuptodateonallnewIECpublications.JustPublisheddetailsallnewpublicationsreleased.Availableonlineandonceamonthbyemail.IECCustomerServiceCentre-webstore.iec.ch/cscIfyouwishtogiveusyourfeedbackonthispublicationorneedfurtherassistance,pleasecontacttheCustomerServiceCentre:salesiec.ch.IECProducts&ServicesPortal-products.iec.chDiscoverourpowerfulsearchengineandreadfreelyallthepublicationspreviews,graphicalsymbolsandtheglossary.Withasubscriptionyouwillalwayshaveaccesstouptodatecontenttailoredtoyourneeds.Electropedia-www.electropedia.orgTheworld'sleadingonlinedictionaryonelectrotechnology,containingmorethan22500terminologicalentriesinEnglishandFrench,withequivalenttermsin25additionallanguages.AlsoknownastheInternationalElectrotechnicalVocabulary(IEV)online.Warning!Makesurethatyouobtainedthispublicationfromanauthorizeddistributor.CONTENTSFOREWORD5INTRODUCTION71 Scope92 Normativereferences93 Terms5definitions,abbreviatedtermsandsymbols93.1 Termsanddefinitions93.2 Abbreviatedterms103.3 Symbols104 Specificationsofillumination124.1 General124.2 Standardilluminationspectra125 Lightmeasuringdevices(LMDs)135.1 General135.2 LMDconditions135.3 Effectsofreceiverinclination136 Arrangementsofilluminationsource,DUTandLMD146.1 General146.2 Coordinatesystemforviewingdirectionandlightsourceposition146.3 Directionalillumination166.4 Ringlightillumination166.5 Conicalillumination176.6 Hemisphericaldiffuseillumination196.7 Specularillumination206.7.1 Smallandextendedaperturesources206.7.2 Variableaperturesource216.7.3 Annulusaperturesource237 Measuringmethods247.1 General247.2 Standardmeasuringenvironmentconditions247.3 Temporalstability247.4 Standardtestpatterns247.4.1 General247.4.2 Solidcolourpatterns247.4.3 Simpleboxset247.5 Standardlocationsofmeasurementfield257.6 Workingstandardsandreferences257.6.1 Diffusereflectancestandard257.6.2 Specularreflectancestandard257.7 Reflectionmeasurementunderdefinedilluminationconditions267.7.1 General267.7.2 Measurementconditions267.7.3 Reflectancefactorunderhemisphericaldiffuseillumination287.7.4 Off-specularreflectancefactorunderdirectionalillumination297.7.5 Specularreflectanceunder川Uminationfromanannulusaperturesource307.7.6 Hazereflectancefactorunderspecularreflectionilluminationfromavariableaperturesource337.8 Contrastratiounderspecifiedillumination347.8.1 General347.8.2 Contrastratiounderhemisphericaldiffuseillumination347.8.3 Contrastratiounderoff-speculardirectionalillumination357.8.4 Contrastratiounderambient川IIminatiOn367.9 Colourunderspecifiedillumination387.9.1 General387.9.2 Displaycolourunderhemisphericaldiffuseillumination397.9.3 Displaycolourunderoff-speculardirectionalillumination417.9.4 Displaycolourunderambientillumination427.9.5 CIELABcolourgamutvolume448 Variationsofviewingdirection478.1 Purpose478.2 Viewingdirectionrange488.2.1 Measuringmethod488.2.2 Determinationmethods488.2.3 Specifiedconditions488.3 Viewingdirectionrangewithoutgrey-levelinversion498.3.1 Calculationmethod498.3.2 Determinationmethods498.3.3 Specifiedconditions49Annex A (informative)Generalremarkson川Uminationandmeasurementconditions50A.1General50A.2Illuminationandmeasurementconditions50A.3Front-