1、IEC62977-2-8Edition1.02025-06INTERNATIONALSTANDARDElectronicdisplays-Part2-8:Measurementsofopticalcharacteristics-Reflectivedisplays(U)90%0eweN6e9Om-ICS31.120；31.260ISBN978-2-8327-0416-5THISPUBLICATIONISCOPYRIGHTPROTECTEDCopyright2025IEC,Geneva5SwitzerlandAllrightsreserved.Unlessotherwisespecified,n
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7、reelyallthepublicationspreviews,graphicalsymbolsandtheglossary.Withasubscriptionyouwillalwayshaveaccesstouptodatecontenttailoredtoyourneeds.Electropedia-www.electropedia.orgTheworldsleadingonlinedictionaryonelectrotechnology,containingmorethan22500terminologicalentriesinEnglishandFrench,withequivale
8、nttermsin25additionallanguages.AlsoknownastheInternationalElectrotechnicalVocabulary(IEV)online.Warning!Makesurethatyouobtainedthispublicationfromanauthorizeddistributor.CONTENTSFOREWORD5INTRODUCTION71 Scope92 Normativereferences93 Terms5definitions,abbreviatedtermsandsymbols93.1 Termsanddefinitions
9、93.2 Abbreviatedterms103.3 Symbols104 Specificationsofillumination124.1 General124.2 Standardilluminationspectra125 Lightmeasuringdevices(LMDs)135.1 General135.2 LMDconditions135.3 Effectsofreceiverinclination136 Arrangementsofilluminationsource,DUTandLMD146.1 General146.2 Coordinatesystemforviewing
10、directionandlightsourceposition146.3 Directionalillumination166.4 Ringlightillumination166.5 Conicalillumination176.6 Hemisphericaldiffuseillumination196.7 Specularillumination206.7.1 Smallandextendedaperturesources206.7.2 Variableaperturesource216.7.3 Annulusaperturesource237 Measuringmethods247.1
11、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 Specularreflectances
12、tandard257.7 Reflectionmeasurementunderdefinedilluminationconditions267.7.1 General267.7.2 Measurementconditions267.7.3 Reflectancefactorunderhemisphericaldiffuseillumination287.7.4 Off-specularreflectancefactorunderdirectionalillumination297.7.5 Specularreflectanceunder川Uminationfromanannulusapertu
13、resource307.7.6 Hazereflectancefactorunderspecularreflectionilluminationfromavariableaperturesource337.8 Contrastratiounderspecifiedillumination347.8.1 General347.8.2 Contrastratiounderhemisphericaldiffuseillumination347.8.3 Contrastratiounderoff-speculardirectionalillumination357.8.4 Contrastratiou
14、nderambient川IIminatiOn367.9 Colourunderspecifiedillumination387.9.1 General387.9.2 Displaycolourunderhemisphericaldiffuseillumination397.9.3 Displaycolourunderoff-speculardirectionalillumination417.9.4 Displaycolourunderambientillumination427.9.5 CIELABcolourgamutvolume448 Variationsofviewingdirecti
15、on478.1 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Uminati
16、onandmeasurementconditions50A.1General50A.2Illuminationandmeasurementconditions50A.3Front-surfacereflectionsoftheDUT51Annex B (informative)MeasurementfieldonaslantedDUT52Annex C (informative)Lightsource55C.1General55C.2Off-specular(diffuse)reflectancefactorunderdirectionalillumination(7.7.4)55C.3Ref
17、lectancefactorunderhemisphericaldiffuse川Uminatic)n(7.7.3)55C.4Specularcharacteristics55Annex D (informative)Opticalcharacteristicofhemisphericaldiffuse川Umination56Annex E (informative)ComponentsofSPeeUlar川UminatiOn58Annex F (informative)Substitutionmethodfordeterminingthespectralirradianceandthespec
18、tralreflectancefactoratthemeasurementplane61AnnexG(informative)ChromaticitygamutareainCIE1931xychromaticitydiagram63Bibliography64Figure 1 -ShapeofmeasuringspotofLMD14Figure 2 -IllustrationofsphericaldirectionsandforthelightsourceandLMD15Figure 3 -Polarcoordinatesystemforspecificationofdirections(il
19、luminationandmeasurement)15Figure 4 -Illustrationofadirectionalillumination16Figure 5 -Examplesofconicalillumination18Figure 6 -Exampleofconicalilluminationdevice19Figure 7 -Examplesofhemisphericaldiffuseillumination(configurationB)20Figure8-Exampleofspecularilluminationusing1o（八）and15o(b)uniformsou
20、rces21Figure 9 -VASinspecular（八）andoff-specular(b)reflectionconfigurations22Figure 10 -Illustrationshowingtheuseoftheannuluslightsourceformeasuringreflectionsinthespeculardirection（八）andtheidealizedluminanceprofile(b)23Figure 11 -Measurementpointsoftheannulussourcewithopaquecentreforspectralradiance
21、31Figure 12 -InputRGBcolourcubeandcorrespondingCIELABgamutvolume45Figure 13 -TetrahedraltessellationoftheRGBcolourcubewith55samplesoneachface(fromIEC62977-2-2,AnnexB.4)47FigureA.1-Arrangementofilluminationofthereflectivedisplayundermeasurement(DUT)andthelightmeasuringdevice(LMD)50Figure A 2-Illustra
22、tionofreflectionraysfromthefirstsurfaceandthemodulatedreflection51Figure B 1-SchematicdiagramofDUTmeasurementusingaLMDandtheshapeofthemeasurementfieldsonDUT53Figure C 2-CentreshiftofthemeasurementfieldontheDUTforthedatagiveninTableB.154Figure C 1-Schematicdiagramofanexampleoftheopaquecentreapertures
23、top55Figure D 1-Examplehemisphericaldiffuseilluminationwithglosstrap(GT)oppositetoLMDinclination56FigureD.2-Normalizedilluminanceatthelocationofthemeasuringspot56Figure D 3-ContourplotdrawnwithlinesofequalcolourdifferenceA*ab57Figure E 1-ExampleofaBRDFobtainedforadisplaysurfacethatshowslightscatteri
24、ngcomponents:specular,hazeandLambertian58Figure F 2-One-dimensionalsimulationofthereflectancedistributionfrom（八）and0,25oto15o(b)subtenselightsourcesusingtheBRDFfromFigureE.159Table 1 -Measurementstructurefromopticalquantities,toevaluationsandtoresults(topdown)8Table 2 -Summaryofsymbols11Table 3 -Ref
25、erenceillumiatconditions12Table 4 -Colourcode24Table 5 -Thereferenceparametersforcalculatingambientcontrastratio37Table 6 -Numberofsamplecoloursandcorrespondingimagelevels(in8bitcodespace)whensubdividingeachfaceoftheRGBcolourcubeinto11divisions46Table 7 -Definitionsandexamplesofviewingdirectionrange
26、s48TableB.1-NumericalvaluesforthemeasurementfieldonaplaneandslantedDUT54INTERNATIONALELECTROTECHNICALCOMMISSIONELECTRONICDISPLAYS-Part-2-8:Measurementsofopticalcharacteristics-ReflectivedisplaysFOREWORD1) TheInternationalElectrotechnicalCommission(IEC)isaworldwideorganizationforstandardizationcompri
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34、rotherdamageofanynaturewhatsoever,whetherdirectorindirect,orforcosts(includinglegalfees)andexpensesarisingoutofthepublication,useof,orrelianceupon,thisIECPublicationoranyotherIECPublications.8) AttentionisdrawntotheNormativereferencescitedinthispublication.Useofthereferencedpublicationsisindispensab
35、leforthecorrectapplicationofthispublication.9) IECdrawsattentiontothepossibilitythattheimplementationofthisdocumentmayinvolvetheuseof（八）patent(三).IECtakesnopositionconcerningtheevidence,validityorapplicabilityofanyclaimedpatentrightsinrespectthereof.Asofthedateofpublicationofthisdocument,IEChadnotre
36、ceivednoticeof（八）patent(三)jwhichmayberequiredtoimplementthisdocument.However,implementersarecautionedthatthismaynotrepresentthelatestinformation,whichmaybeobtainedfromthepatentdatabaseavailableathttps:/patents.iec.ch.IECshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.IEC62977-2-8hasb
37、eenpreparedbyIECtechnicalcommittee110:Electronicdisplays.ItisanInternationalStandard.ThetextofthisInternationalStandardisbasedonthefollowingdocuments:DraftReportonvoting110/1745/FDIS110/1764/RVDFullinformationonthevotingforitsapprovalcanbefoundinthereportonvotingindicatedintheabovetable.Thelanguageu
38、sedforthedevelopmentofthisInternationalStandardisEnglish.ThisdocumentwasdraftedinaccordancewithISO/IECDirectives,Part2,anddevelopedinaccordancewithISO/IECDirectives,Part1andISO/IECDirectives,IECSupplement5availableatwww.iec.ch/members_experts/refdocs.ThemaindocumenttypesdevelopedbyIECaredescribeding
39、reaterdetailatwww.iec.ch/publications.AlistofallpartsintheIEC62977series,publishedunderthegeneraltitleElectronicdisplays,canbefoundontheIECwebsite.ThecommitteehasdecidedthatthecontentsofthisdocumentwillremainunchangeduntilthestabilitydateindicatedontheIECwebsiteunderwebstore.iec.chinthedatarelatedto
40、thespecificdocument.Atthisdate,thedocumentwillbe reconfirmed, withdrawn,or revised.INTRODUCTIONAlldocumentspublishedbyIECTC110thatarewrittenonthemeasurementforelectronicdisplaysrefertoasetofmethodsandproceduresthataresimilartooneanother.Thesemeasurementmethodsaresometimesidentical.Thisdocumentiswrit
41、tenforreflectivedisplaysbyreferringtoIEC62977-2-2andisintendedtoidentifythesemethodsandtodescribethemtogetherwithsuitableprecautionsanddiagnostics.Therefore5thisdocumentcanbeareferenceforforthcomingstandardstomaketheworkoftheinvolvedexpertsmoreefficientandtoavoidreduplicationofefforts.Introductionof
42、thecommonopticalmeasurementmethods(COMM)isalsorelatedtoastructurewhereeachkindofopticalmeasurementfindsitsunambiguouspositionforidentificationofsimilaritiestoothermethodsorforclarificationofdistinctions.Thisstructuralclassificationtogetherwithageneraltaxonomyissupposedtomaketheprocessofstandardsprod
43、uctioneasier,fasterandthusmoreeffective.Thisdocumentdescribesthecommonopticalmeasurementmethodsapplicabletothereflectivedisplays.However5thecontentsoverlapwithsomepartsoftheexistingstandardswhicharedevelopedinTC110(IEC61747-6-2:2011andIEC62679-3-1:2014),inwhichthedocumentsdescribetheopticalmeasureme
44、ntmethodsoftheindividualdisplaytechnologies,suchasLCDandE-paper.Thisdocumentisintendedtobeusedascommonopticalmeasurementmethodsforthereflectivedirectviewtypeandareferencedocumentforfuturestandards.Inaddition,thepresentdocumentcanbeusedintherevisionsoftheexistingstandards(IEC61747-6-2:2011andIEC62679
45、3-1:2014)intheirmaintenancetimebyreferringtothisdocumenttothelargestextentpossible.ThecharacteristicsandthemeasurementmethodsofelectronicdisplaysintheIEC62977seriesaresummarizedinTable1.Table1-Measurementstructurefromopticalquantities,toevaluationsandtoresults(topdown)VariablesTimeLocation,y)Direct
46、ionS,)Testpattern,electricaldriving,inputsignalIlluminationconditionsTemperature,humidityDatasamplingconditionFastSlowSlowSlowaSlowaResultstransitionsfromoneopticalstatetoanotherstatetemporalstability(uniformity)uniformityuniformity3staticpatternacharacteristicfunction(electro-optictransferfunction,
47、EOTF)characteristicvalues(e.g.threshold,saturation),darkroomindooraoutdoorastandardenvironmentalconditions3Evaluations1storderturn-on,turnoff,delay(latency)timeperiods,temporalmodulationsluminancereflectance3contrast3Chromaticityathreshold,saturationvalues,steepnessoftransitions,etc.Evaluations2ndorderflickerprediction,movingpictureresponsetime,etc.EOTFfromwhichtheexponentgammaisevaluatedchromaticityandcolourgamutareaacolourgamutvolumeaaIndicatesthecha
