IEC 62977-2-8 2025.docx

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1、IEC62977-2-8Edition1.02025-06INTERNATIONALSTANDARDElectronicdisplays-Part2-8:Measurementsofopticalcharacteristics-Reflectivedisplays(U)90%0eweN6e9Om-ICS31.120；31.260ISBN978-2-8327-0416-5THISPUBLICATIONISCOPYRIGHTPROTECTEDCopyright2025IEC,Geneva5SwitzerlandAllrightsreserved.Unlessotherwisespecified,n

2、opartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingandmicrofilm,withoutpermissioninwritingfromeitherIECorIECsmemberNationalCommitteeinthecountryoftherequester.IfyouhaveanyquestionsaboutIECcopyrightorhaveanenquiryaboutobtainingadditionalri

3、ghtstothispublication,pleasecontacttheaddressbeloworyourlocalIECmemberNationalCommitteeforfurtherinformation.IECSecretariatTel.:+412291902113,ruedeVarembeinfoiec.chwww.iec.chCH-1211Geneva20SwitzerlandAbouttheIECTheInternationalElectrotechnicalCommission(IEC)istheleadingglobalorganizationthatprepares

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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

27、singallnationalelectrotechnicalcommittees(IECNationalCommittees).TheobjectofIECistopromoteinternationalco-operationonallquestionsconcerningstandardizationintheelectricalandelectronicfields.Tothisendandinadditiontootheractivities,IECpublishesInternationalStandards,TechnicalSpecifications,TechnicalRep

28、orts,PubliclyAvailableSpecifications(PAS)andGuides(hereafterreferredtoas,IECPubIication(三)”).Theirpreparationisentrustedtotechnicalcommittees;anyIECNationalCommitteeinterestedinthesubjectdealtwithmayparticipateinthispreparatorywork.International,governmentalandnon-governmentalorganizationsliaisingwi

29、ththeIECalsoparticipateinthispreparation.IECcollaboratescloselywiththeInternationalOrganizationforStandardization(ISO)inaccordancewithconditionsdeterminedbyagreementbetweenthetwoorganizations.2) TheformaldecisionsoragreementsofIEContechnicalmattersexpress,asnearlyaspossible,aninternationalconsensuso

30、fopinionontherelevantsubjectssinceeachtechnicalcommitteehasrepresentationfromallinterestedIECNationalCommittees.3) IECPublicationshavetheformofrecommendationsforinternationaluseandareacceptedbyIECNationalCommitteesinthatsense.WhileallreasonableeffortsaremadetoensurethatthetechnicalcontentofIECPublic

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32、nanyIECPublicationandthecorrespondingnationalorregionalpublicationshallbeclearlyindicatedinthelatter.5) IECitselfdoesnotprovideanyattestationofconformity.Independentcertificationbodiesprovideconformityassessmentservicesand,insomeareas,accesstoIECmarksofconformity.IECisnotresponsibleforanyservicescar

33、riedoutbyindependentcertificationbodies.6) Allusersshouldensurethattheyhavethelatesteditionofthispublication.7) NoliabilityshallattachtoIECoritsdirectors,employees,servantsoragentsincludingindividualexpertsandmembersofitstechnicalcommitteesandIECNationalCommitteesforanypersonalinjury,propertydamageo

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