1、BSIEC62977-2-8:2025EIeetroniCdisplaysPart2-8:MeasurementsofopticalcharacteristicsReflectivedisplaysbsi.NationalforewordThisBritishStandardistheUKimplementationofIEC62977-2-8:2025.TheUKparticipationinitspreparationwasentrustedtoTechnicalCommitteeEPL/100,Audio-visualequipment.Alistoforganizationsrepre
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5、aspublishedundertheauthorityoftheStandardsPolicyandStrategyCommitteeon30June2025.Amendments/corrigendaissuedsincepublicationDateTextaffectedIECIEC62977-2-8Edition1.02025-06INTERNATIONALSTANDARDElectronicdisplays-Part2-8:Measurementsofopticalcharacteristics-Reflectivedisplays(U)90%0eweN6e9Om-ICS31.12
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13、ddistributor.CONTENTSFOREWORD5INTRODUCTION71 Scope92 Normativereferences93 Terms3definitions,abbreviatedtermsandsymbols93.1 Termsanddefinitions93.2 Abbreviatedterms103.3 Symbols104 SpecificationsOf川Umination124.1 General124.2 Standardilluminationspectra125 Lightmeasuringdevices(LMDs)135.1 General135
14、2 LMDconditions135.3 Effectsofreceiverinclination136 ArrangementsOf川IJminationsource,DUTandLMD146.1 General146.2 Coordinatesystemforviewingdirectionandlightsourceposition146.3 Directional川Umination166.4 Ringlightillumination166.5 Conicalillumination176.6 Hemisphericaldiffuseillumination196.7 Specul
15、arillumination206.7.1 Smallandextendedaperturesources206.7.2 Variableaperturesource216.7.3 Annulusaperturesource237 Measuringmethods247.1 General247.2 Standardmeasuringenvironmentconditions247.3 Temporalstability247.4 Standardtestpatterns247.4.1 General247.4.2 Solidcolourpatterns247.4.3 Simpleboxset
16、247.5 Standardlocationsofmeasurementfield257.6 Workingstandardsandreferences257.6.1 Diffusereflectancestandard257.6.2 Specularreflectancestandard257.7 Reflectionmeasurementunderdefinedilluminationconditions267.7.1 General267.7.2 Measurementconditions267.7.3 Reflectancefactorunderhemisphericaldiffuse
17、illumination287.7.4 Off-specularreflectancefactorunderdirectional川Umination297.7.5 Specularreflectanceunderilluminationfromanannulusaperturesource307.7.6 Hazereflectancefactorunderspecularreflectionilluminationfromavariableaperturesource337.8 Contrastratiounderspecifiedillumination347.8.1 General347
18、8.2 Contrastratiounderhemisphericaldiffuseillumination347.8.3 Contrastratiounderoff-speculardirectionalillumination357.8.4 Contrastratiounderambientillumination367.9 Colourunderspecified川UminatiOn387.9.1 General387.9.2 Displaycolourunderhemisphericaldiffuseillumination397.9.3 Displaycolourunderoff-
19、speculardirectionalillumination417.9.4 Displaycolourunderambientillumination427.9.5 CIELABcolourgamutvolume448 Variationsofviewingdirection478.1 Purpose478.2 Viewingdirectionrange488.2.1 Measuringmethod488.2.2 Determinationmethods488.2.3 Specifiedconditions488.3 Viewingdirectionrangewithoutgrey-leve
20、linversion498.3.1 Calculationmethod498.3.2 Determinationmethods498.3.3 Specifiedconditions49Annex A (informative)Generalremarksonilluminationandmeasurementconditions50A.1General50A.2Illuminationandmeasurementconditions50A.3Front-surfacereflectionsoftheDUT51Annex B (informative)Measurementfieldonasla
21、ntedDUT52Annex C (informative)Lightsource55C.1General55C.2Off-specular(diffuse)reflectancefactorunderdirectionalillumination(7.7.4)55C.3Reflectancefactorunderhemisphericaldiffuse川Umination(7.7.3)55C.4Specularcharacteristics55Annex D (informative)Opticalcharacteristicofhemisphericaldiffuseilluminatio
22、n56Annex E (informative)Componentsofspecularillumination58Annex F (informative)Substitutionmethodfordeterminingthespectralirradianceandthespectralreflectancefactoratthemeasurementplane61Annex G (informative)ChromaticitygamutareainCIE1931xychromaticitydiagram63Bibliography64Figure 1 -Shapeofmeasuring
23、spotofLMD14Figure 2 -IllustrationofsphericaldirectionsandforthelightsourceandLMD15Figure 3 -Polarcoordinatesystemforspecificationofdirections(illuminationandmeasurement)15Figure 4 -Illustrationofadirectionalillumination16Figure 5 -Examplesofconicalillumination18Figure 6 -Exampleofconicalillumination
24、device19Figure 7 -Examplesofhemisphericaldiffuseillumination(configurationB)20Figure 8 -Exampleofspecularilluminationusing1o（八）and15o(b)uniformsources21Figure 9 -VASinspecular（八）andoff-specular(b)reflectionconfigurations22Figure 10 -Illustrationshowingtheuseoftheannuluslightsourceformeasuringreflect
25、ionsinthespeculardirection（八）andtheidealizedluminanceprofile(b)23Figure 11 -Measurementpointsoftheannulussourcewithopaquecentreforspectralradiance31Figure 12 -InputRGBcolourcubeandcorrespondingCIELABgamutvolume45Figure 13 -TetrahedraltessellationoftheRGBcolourcubewith55samplesoneachface(fromIEC62977
26、2-2,AnnexB.4)47FigureA.1-Arrangementofilluminationofthereflectivedisplayundermeasurement(DUT)andthelightmeasuringdevice(LMD)50Figure A 2-Illustrationofreflectionraysfromthefirstsurfaceandthemodulatedreflection51Figure B 1-SchematicdiagramofDUTmeasurementusingaLMDandtheshapeofthemeasurementfieldsonD
27、UT53Figure C 2-CentreshiftofthemeasurementfieldontheDUTforthedatagiveninTableB.154Figure C 1-Schematicdiagramofanexampleoftheopaquecentreaperturestop55Figure D 1-Examplehemisphericaldiffuse川IlminatiOnwithglosstrap(GT)oppositetoLMDinclination56FigureD.2-Normalized川IIminanCeatthelocationofthemeasuring
28、spot56Figure D 3-ContourplotdrawnwithlinesofequalcolourdifferenceA*ab57Figure E 1-ExampleofaBRDFobtainedforadisplaysurfacethatshowslightscatteringcomponents:specular,hazeandLambertian58Figure F 2-One-dimensionalsimulationofthereflectancedistributionfrom（八）and0,25oto15o(b)subtenselightsourcesusingthe
29、BRDFfromFigureE.159Table 1 -Measurementstructurefromopticalquantities,toevaluationsandtoresults(topdown)8Table 2 -Summaryofsymbols11Table 3 -Referenceillumiatconditions12Table 4 -Colourcode24Table 5 -Thereferenceparametersforcalculatingambientcontrastratio37Table 6 -Numberofsamplecoloursandcorrespon
30、dingimagelevels(in8bitcodespace)whensubdividingeachfaceoftheRGBcolourcubeintondivisions46Table 7 -Definitionsandexamplesofviewingdirectionranges48TableB.1-NumericalvaluesforthemeasurementfieldonaplaneandslantedDUT54IEC62977-2-8:2025IEC2025INTERNATIONALELECTROTECHNICALCOMMISSIONELECTRONICDISPLAYS-Par
31、t-2-8:Measurementsofopticalcharacteristics-ReflectivedisplaysFOREWORD1) TheInternationalElectrotechnicalCommission(IEC)isaworldwideorganizationforstandardizationcomprisingallnationalelectrotechnicalcommittees(IECNationalCommittees).TheobjectofIECistopromoteinternationalco-operationonallquestionsconc
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39、rrelianceupon,thisIECPublicationoranyotherIECPublications.8) AttentionisdrawntotheNormativereferencescitedinthispublication.Useofthereferencedpublicationsisindispensableforthecorrectapplicationofthispublication.9) IECdrawsattentiontothepossibilitythattheimplementationofthisdocumentmayinvolvetheuseof
40、八）patent(三).IECtakesnopositionconcerningtheevidence,validityorapplicabilityofanyclaimedpatentrightsinrespectthereof.Asofthedateofpublicationofthisdocument,IEChadnotreceivednoticeof（八）patent(三),whichmayberequiredtoimplementthisdocument.However,implementersarecautionedthatthismaynotrepresentthelatest
41、information,whichmaybeobtainedfromthepatentdatabaseavailableathttps:/patents.iec.ch.IECshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.IEC62977-2-8hasbeenpreparedbyIECtechnicalcommittee110:Electronicdisplays.ItisanInternationalStandard.ThetextofthisInternationalStandardisbasedonthefo
42、llowingdocuments:DraftReportonvoting110/1745/FDIS110/1764/RVDFullinformationonthevotingforitsapprovalcanbefoundinthereportonvotingindicatedintheabovetable.ThelanguageusedforthedevelopmentofthisInternationalStandardisEnglish.ThisdocumentwasdraftedinaccordancewithISO/IECDirectives,Part2,anddevelopedin
43、accordancewithISO/IECDirectives,Part1andISO/IECDirectives,IECSupplement5availableatwww.iec.ch/members_experts/refdocs.ThemaindocumenttypesdevelopedbyIECaredescribedingreaterdetailatwww.iec.ch/publications.AlistofallpartsintheIEC62977series,publishedunderthegeneraltitleElectronicdisplays,canbefoundon
44、theIECwebsite.ThecommitteehasdecidedthatthecontentsofthisdocumentwillremainunchangeduntilthestabilitydateindicatedontheIECwebsiteunderwebstore.iec.chinthedatarelatedtothespecificdocument.Atthisdate,thedocumentwillbe reconfirmed, withdrawn,or revised.IntroductionAlldocumentspublishedbyIECTC110thatare
45、writtenonthemeasurementforelectronicdisplaysrefertoasetofmethodsandproceduresthataresimilartooneanother.Thesemeasurementmethodsaresometimesidentical.ThisdocumentiswrittenforreflectivedisplaysbyreferringtoIEC62977-2-2andisintendedtoidentifythesemethodsandtodescribethemtogetherwithsuitableprecautionsa
46、nddiagnostics.Therefore5thisdocumentcanbeareferenceforforthcomingstandardstomaketheworkoftheinvolvedexpertsmoreefficientandtoavoidreduplicationofefforts.Introductionofthecommonopticalmeasurementmethods(COMM)isalsorelatedtoastructurewhereeachkindofopticalmeasurementfindsitsunambiguouspositionforident
47、ificationofsimilaritiestoothermethodsorforclarificationofdistinctions.Thisstructuralclassificationtogetherwithageneraltaxonomyissupposedtomaketheprocessofstandardsproductioneasier,fasterandthusmoreeffective.Thisdocumentdescribesthecommonopticalmeasurementmethodsapplicabletothereflectivedisplays.However5thecontentsoverlapwithsomepartsoftheexistingstandardswhicharedevelopedinTC110(IEC61747-6-2:2011andIEC62679-3-1:2014),inwhichthedocumentsdescribetheopticalmeasurementmethodsoftheindividualdisplaytechnologies,suchasLCDand
