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1、Red,Green,andBlueLEDbasedwhitelightgeneration:IssuesandcontrolSubramanianMuthuFrankJ.SchuurmansMichaelD.PashleyPhilipsResearch,PhilipsResearch,PhilipsResearch,345ScarboroughRoad,PostboxWA-03,ProfHolstlaan4,345ScarboroughRoad,BirarcliffManor,NY10510,USA.5655AAEindhoven,Netherlands.Birarcl
2、iffManor,NY10510,USA.Subu.Muthu@Philips.ComFrank.Schuurmans@Philips.ComMichael.Pashley@Philips.ComAbstract—Therecentimprovementsinhigh-powerlight-emittingdiodes(LED)technologywith100+lumensperLEDInGaNLEDschipandefficacyexceedingthatofincandescentlamps,brings550nmAlInGaPLEDs0.4590nmthesol
3、id-statelightingclosetoareality.AnLEDlightsource610nm650nmmadeofRed,GreenandBlue(RGB)LEDscanprovidea2000Kcompactlightsourcewithuniquefeaturessuchasinstantcolor0.3variability.However,thewhitelightgenerationusingmany10000Kcompact,discreteRGBlightsourceshasthefollowingissues:vuniformspatial
4、lightmixinganddistribution,whitecolorpoint0.2maintenanceandthermalmanagement.Specifically,thewhitecolorpointmaintenanceisastringentrequirementinmanyapplications.Meetingthisrequirementisaseverechallengedue0.1tothevariationintheopticalcharacteristicsoftheRGB-LEDs450nmwithtemperature,timean
5、dforwardcurrentandthespreadin0theLEDperformance.Thisresultsin1)anunacceptablyhigh00.10.20.30.40.50.6variabilityinwhitelightcolorpointand2)difficultiesinumanufacturingreproducibleLEDlamps.Figure1.The1964CIEuvcoordinatesystemshowingInthispaper,wehighlighttheissuesthatintroducethethecoordin
6、atesofInGaNandAlInGaPLEDs.Italsovariabilityinthecolorpointandpresentfeedbackcontrolincludestheblackbodylineoveracolortemperatureschemestoovercometheseproblems.Wealsoshowtheresultsofrangeof2000Kto10000K.experimentsandtheoreticalmodelingforpracticalcontrolsystems.However,realizationofRGB-L
7、EDwhitelightinghasmanychallenges.Keywords—LED;whitelight;colorcontrol;lightsensing;colorfilters;tristimulusvaluesArequirementinwhitelightapplicationsisthatlampsofthesametypehavethesamecolorpoint.ThecolorpointmayI.INTRODUCTIONchangewithtimeortemperature,butlampssharingthes
