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背投三维.pdf

背投三维.pdf

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简介:本文档为《背投三维pdf》,可适用于硬件技术领域,主题内容包含JOURNALOFDISPLAYTECHNOLOGY,VOL,NO,AUGUSTLowCrosstalkMultiViewTrackingDDisp符等。

JOURNALOFDISPLAYTECHNOLOGY,VOL,NO,AUGUSTLowCrosstalkMultiViewTrackingDDisplayofSynchroSignalLEDScanningBacklightSystemJianChiunLiou,KuanLee,andJuyFongHuangAbstractManypeoplebelievethatinthefuture,autostereoscopicDdisplayswillbecomeamainstreamdisplaytypeAchievementofhigherqualityDimagesrequiresbothhigherpanelresolutionandmoreviewingzonesConsequently,thetransmissionbandwidthoftheDdisplaysystemsinvolvesenormousamountsofdatatransferThisstudyintegratedaviewertrackingsystemandasynchrosignalLEDscanningbacklightmodulewithanautostereoscopicDdisplaytoreducethecrosstalkofrightlefteyeimagesanddatatransferbandwidth,whilemaintainingDimageresolutionLightemittingdiodes(LED)areadotlightsourceofthedynamicbacklightmoduleWhenmodulatingthedynamicbacklightmoduletocontrolthedisplaymodeofthestereoscopicdisplay,theupdatingspeedofthedynamiclightemittingregionsandtheupdatingspeedofpixelsweresynchronalForeachframeperiod,theviewercanaccuratelyviewthreedimensionalimages,andthethreedimensionalimagesdisplayedbythestereoscopicdisplayhavefullresolutionThestereoscopicdisplaytrackstheviewer’spositionorcanbewatchedbymultipleviewersThisstudydemonstratedthatthethreedimensionalimagedisplayedbythestereoscopicdisplayisofhighquality,andanalyzedthisphenomenonThemultiviewertrackingstereoscopicdisplaywithintelligentmultiplexingcontrolofLEDbacklightscanninghadlowcrosstalk,below,whenphaseshiftwassIndexTermsCrosstalk,scanningbacklight,synchrosignal,threedimensional(D),viewtrackingIINTRODUCTIONINTHEPASTdecade,flatpaneldisplayshavebecomeamajorglobalproductInviewofthisphenomenon,LCDtypeDdisplayscouldpotentiallydominatetheDdisplaymarketinthefutureBasedonflatpaneldisplayinfrastructure,twomaintypesofDdisplayexist:timemultiplexedandspatialmultiplexedDdisplays–TheformerutilizesahighfrequencyresponseLCDpaneltoincreasedisplayfrequencyWithappropriateaccessorieslikeshutterglassesoranopticalswitchdevice,atimemultiplexeddisplayseparatelydisplaystwodifferentviewsforeacheye,givingthevieweraparallaxandultimatelyDeffectThelatterdistributesdifferentimagestodifferentviewingzones,showingDcontentbyaddingopticaldevices,likealenticularlensorparallaxbarrier,tocontrolthedirectionofthebacklightandallocatetheimagestodifferentviewingzonesManuscriptreceivedJuly,revisedOctober,,December,,andFebruary,acceptedMarch,DateofcurrentversionJune,TheauthorsarewiththeElectronicsandOptoelectronicsResearchLaboratoriesoftheIndustrialTechnologyResearchInstitute(EOLITRI),Hsinchu,Taiwan(email:jcliouitriorgtw)Colorversionsofoneormoreofthefiguresinthispaperareavailableonlineathttp:ieeexploreieeeorgDigitalObjectIdentifierJDTOurinnovativeDtechnologyformultiviewertrackingstereoscopicdisplayincludedadisplaypanel,adynamicbacklightmodulefeaturingmanylightemittingregions,andatrackingpanelplacedbetweenthedisplaypanelandthedynamicbacklightmoduleDuringaframeperiod,thedisplayhasanupdatedregionandanonupdatedregionThedisplaypaneldisplaysaccordingtoasynchrosignal,andtheupdatedandnonupdatedregionsseparatelydisplayleftandrighteyeimagesThelightemittingregionsareactivatedbyasynchrosignalDuringtheframeperiod,partsofthelightemittingregionscorrespondingtotheupdatedregionaresynchronallyturnedonwhileotherpartsofthelightemittingregionscorrespondingtothenonupdatedregionaresynchronallyturnedoffThetrackingpanelfeaturesmanyslitsetsAtleastoneoftheslitsetsisturnedonaccordingtothepositioninformationoftheviewerandthesynchrosignalLightisprovidedbythepartsoftheturnedonlightemittingregionsthatpassthroughoneoftheslitsetsandthedisplaypanelinsuchawaythatthenonupdatedregiononlydisplaysoneofthesingleeyeimagesTodisplayDcontent,wemusttransmitatleaststereoimagepairofimagecontenttotheDdisplay,indicatingthatmoreviewsrequiremorebandwidthfortransmittanceHowever,duetolimitedbandwidth,withghosting(afaintsecondaryimageproducedbyanopticalsystem),fixedviewingpointortracker,orsplitimagehalfresolutionoftencausestheresolutionoftheDimagesforeachviewingzonetobereduced–UseofaviewertrackingtechniquecouldresolvethisproblementirelyThisstudyintegratedaviewertrackingtechniquewithaDdisplaytoverifythefeasibilityofsuchatechniqueanditsperformanceIIVIEWERTRACKINGDDISPLAYThisstudyintegratedanautostereoscopicdisplaywithaviewertrackingsystemFigillustratesthebasicstructureofthedisplayandTableIshowsthespecificationsoftheimageliquidcrystalpanelIntheproposedstructure,aretarderinsertedbetweentheimagepanelsrotatedthelightbeamatsimultaneously,alenticularplateadjustedthelightdirectiontoshowthelightslitfromthetrackingdisplayRetarderfilmisaclearbirefringentmaterialthataltersthephaseofapolarizedbeamoflightAquarterwaveplatecanconvertlinearlypolarizedlight(orientedatfromthedirectionofthefastslowaxis)intocircularlypolarizedlightConversely,thewaveplatecanconvertacircularlypolarizedbeamintolinearlypolarizedlightInthisstudy,whenthepolarizationdirectionoftheincidentlightformedanincludedanglewiththeopticalaxisoftheretarder,thepolarizationofthelightpassingthroughtheretardationregionsrotatedbyandbecameorthogonaltothepolarizationofthelightpassingthoughtheretardationX$IEEEJOURNALOFDISPLAYTECHNOLOGY,VOL,NO,AUGUSTFigThestructureoftheproposedviewertrackingdisplaypanelTABLEIIMAGELIQUIDCRYSTALPANELSPECIFICATIONregionsThemoldingmethodfabricatedthelenticularplatewithpolymericfilmasthesubstratematerialOneofthelightslitpatternpairsadjustedthedirectionoflightfromthetrackingpaneltotheviewer’seyesthroughthelenticularplateInthisdisplay,thePDLCpanelplayedanimportantroleinthefunctionoftheDDswitchWhenthePDLCpanelwasturnedtoclearstate,themicroretarderinteractedwiththepolarizerstoformaparallaxbarrierpattern,makingthedisplayautostereoscopicInacasewherethePDLCpanelisinadiffusivestate,thelightpassingthroughthePDLCdestroysthepolarizationThemicroretarderthenlosesitsfunctionasaparallaxbarrier,andthedisplaybecomesageneralDdisplayInthisdisplay,thelightslittrackingdisplaypanelplayedanimportantroleinthefunctionoflightslitselectionoftheeightviewingzonesThetrackingpanelcontrolledwhetherthelightofthebacklightmodulepassedthroughornotThetrackingpanelfeaturesmanytrackingslitpatternsandswitchesthesepatternsaccordingtothesynchronizationsignalofthedisplayTABLEIIMICROSOFTWEBCAMSPECIFICATIONFigPatternofamicroretarderpanelBasedonaviewer’sposition,theviewertrackingbasedautostereoscopicdisplaysendsdifferentpairsofstereoimageseachviewedimagehasfullpanelresolutionandcanbeimplementedinaneightviewautostereoscopicdisplayIntheexperiments,awebcamcapturedtheimageoftheviewerfortracking(TableIIshowsthespecificationoftheLogitechwebcam)Imageprocessingdeterminedtheviewer’spositionTherefore,usingtherecognizedpositionoftheviewermovingintheviewingrangeofthedisplay,thelightslittrackingdisplaypanelsentcorrespondingstereoimages,thusprovidingmotionparallaxthatfollowstheviewer’smovementAmicroretarderisaplateconsistingoftwoopticalretardationstatesthataremicropatternedwithindifferentregionsFigshowsamicroretarderwithandretardationinacolumninterleavedpatternWhenthepolarizationdirectionoftheincidentlightformedanincludedangleofwiththeopticalaxisofthemicroretarder,thepolarizationofthelightpassingthroughtheretardationregionsrotatedandbecameorthogonaltothepolarizationofthelightpassingthoughtheretardationregionsThisexplainswhythemicroretarderformsaparallaxbarrierinautostereoscopicdisplaysTheretardationoftheareascannedbylaserbeamsiserasedandbecomesaretardationregion,whiletheareawithoutscanningremainsatretardationAViewerTrackingDDisplaySystemThisstudydevelopedautostereoscopicdisplayapparatusandadisplaymethodTheautostereoscopicdisplayapparatusincludedadisplaypanel,abacklightmodule,atrackingslitpanelandanopticallensarrayInaframetime,thedisplaypanelandtrackingpanelsharethesamesynchronizationsignalforthedisplaypanelThetrackingpanelcontrolsthelightofthebacklightmoduleThetrackingpanelfeaturestrackingslitpatternsandswitchestheslitpatternsaccordingtothesynchronizationsignalUntilallscreendataisupdated,thebacklightmoduleisinactiveduringtheframetimeAlightprovidedbythepartofthebacklightregionspassesthroughthetrackingslitset,opticallensarray,andthedisplaypanelinsuchawaythateacheyeseparatelyperceivesimagesAsshowninFig,whentheviewerLIOUetal:LOWCROSSTALKMULTIVIEWTRACKINGDDISPLAYOFSYNCHROSIGNALLEDSCANNINGBACKLIGHTSYSTEMFigRelationsbetweenviewerandtrackingpanelmovestotheleft,thetrackingslitsetchangesitspatterntodisplaythecorrectimageTheautostereoscopicdisplayintegratedawebcamastherealtimedetectiondevicefortrackingoftheviewer’sheadeyepositions,sothatthedisplayshowedleftandrighteyeimagescorrectlyThecomputervisionbasedtrackingmethoddetectsviewer’seyesoveraspecificrangeandunderconditionsoflowandfluctuatingilluminationBycapturingtheimageoftheviewerinfrontofthedisplay,theviewer’spositioniscalculatedandtherelatedpositiondataistransferredtothefieldprogrammablegatearray(FPGA)controllerthroughRSWhentheviewerrecognizesthathesheisstandingatthebordersoftheviewingzones,analyzingthecapturedviewerimagesdeterminestheborderpositionsoftheviewingzonesTheresultingeyereferencepatternallowsthetrackertolocatetheviewer’seyesinlivevideoimagesIfanobservermovesawayfromhisoriginalposition,thetrackingslitwillvaryitspatternaccordingtotheviewer’snewpositionTheviewerstillperceivestwoeyeimagesseparatelybeforeexceedingthewebcamdetectionrangeFigshowstheviewertrackingsystemThispaperaddressesthespecifictechnologicalchallengesofautostereoscopicDdisplaysandpresentsanovelsystemthatintegratesarealtimeviewertrackingsystemwithanautostereoscopicdisplayOursuccessfullydesignedprototypeutilizedaFPGAsystemtosynchronizebetweenadisplaypanelandtrackingslitpanelWithHzdisplayandtrackingpanels,onlyapairofpageflippedleftandrighteyeimageswasnecessarytoproduceamultivieweffectFurthermore,fullresolutionwasmaintainedfortheimagesofeacheyeTheloadingoftheFigViewertrackingDdisplaysystemtransmissionbandwidthwascontrollable,andthebinocularparallaxandmotionparallaxisasgoodastheusuallylowerresolutionmultiviewautostereodisplayBLEDBacklightArchitectureManytypesofLEDbacklightsareappliedtoDorDdisplays–Todate,researchonDdisplaysystemshasgenerallyfocusedonprovidinguniform,collimatedilluminationoftheLCD,ratherthanaddressinglowcrosstalkissuesThisstudyinvestigatedthemethodofusinganautostereoscopicmultiviewertrackingDdisplaywithasynchrosignalLEDscanningbacklightmoduletoreducethecrosstalkofrighteyeandlefteyeimages,enhancingdatatransferbandwidthwhilemaintainingimageresolutionFig(a)isaschematicviewofastereoscopicdisplayFig(b)isablockdiagramillustratingthestereoscopicdisplaythestereoscopicdisplaycantracktheviewer’spositionandbewatchedbymultipleviewersThebacklightmoduleofthestereoscopicdisplayisadynamicbacklightmodulefeaturingmanylightemittingregionsR()R()Fig(a)excludesthecontrolunitandopticallensarrayInthestereoscopicdisplay,thegraphiccardoutputsandtransmitstheverticalsynchrosignaltothecontrolunitAfterreceivingthesynchrosignal,thecontrolunitoutputsthesynchrosignaltocontrol(turnonoroff)thelightemittingregionsR()R()Tomeettherequirementsofdifferentoneeyeimages,weproposethatthedynamicLEDbacklighttrackingpanelhashavemanybacklightslitsetsAccordingtothepositioninformationofviewerOandtheverticalsynchrosignal,oneoftheslitsetsofthetrackingpanelsisselectedandturnedonEachslitsetincludeseitherleftorrighteyeslitsLightemittedfromthedynamicbacklightmodulepassesthroughtheeitherleftorrighteyeslitandthedisplaypanel,andprojectsontooneeyeofviewerOSimilarly,lightemittedfromthedynamicbacklightJOURNALOFDISPLAYTECHNOLOGY,VOL,NO,AUGUSTFig(a)Schematicviewand(b)blockdiagramofstereoscopicdisplaymodulepassesthroughtheeitherleftorrighteyeslitandthedisplaypanel,andprojectsontotheothereyeofviewerOInthisway,thepairimagesareprojectedtothetwoeyesofviewerO,whocanseeaccuratethreedimensionalimagesForexample,lightemittedfromthedynamicbacklightmodulepassesthroughthelefteyeslitoftheslitsetandthedisplaypanel,andprojectsontothelefteyeofviewerOSimilarly,lightemittedfromthedynamicbacklightmodulepassesthroughtherighteyeslitoftheslitsetandthedisplaypanel,andprojectsontotherighteyeofviewerOTheoneeyeslitsarestripeshapedandthelengthsoftheoneeyeslitsareapproximatelyequaltothelongitudinallengthofthedisplaypanelWhenthedisplaypaneldisplaysanimagebasedontheverticalsynchrosignal,theslitsetofthetrackingpanelisenabledMeanwhile,pixelsintheupdatedregionofthedisplaypaneldisplayalefteyeimage,butpixelsinthenonupdatedregionofthedisplaypanelstilldisplaythepreviousrighteyeimageLightpassingthroughtheslitsetofthetrackingpanelandthenonupdatedregionofthedisplaypanelcanbeprojectedontolefteyeofviewerO(ieacrosstalkphenomenon)ifnoalternativemethodologyisappliedThispaperproposesusingadynamicbacklightmoduletosuppressthecrosstalkThelightemittingregionsRRofthedynamicbacklightmoduleareseparatelycontrolledaccordingtotheverticalsynchrosignalDuringaframeperiod,thelightemittingregionsR()andR()correspondingtotheupdatedregionareturnedonandthelightemittingregionsR()and()correspondingtothenonupdatedregionareturnedoffInthisway,onlythelightemittingregionsR()andR()providelight,sothatnolightpassesthroughtheslitsetofthetrackingpanelandthenonupdatedregionofthedisplaypanelThisreducesthecrosstalkphenomenonofthestereoscopicdisplaysystemAsshowninFig(a)andFig(b),thedisplaymethodofthestereoscopicdisplaycomprisesthefollowingsteps:First,slitdatabanks(Ds)correspondingtothemanyviewinganglesofthestereoscopicdisplayapparatusisestablishedNext,thecontrolunitreceivesinformation(Dv)onthepositionoftheviewerThecontrolunitcomparesthepositioninformationandtheslitdatabanksstoredinadvanceMeanwhile,thecontrolunitoutputstheverticalsynchrosignalfromthegraphiccardtocontroltheoutputmodeofthedynamicbacklightmoduleandoperationmodeofthetrackingpanelThedisplaypanelisdriventodisplayimages(ieimageupdating)accordingtotheverticalsynchrosignaloutputfromthegraphicscardManyofthelightemittingregions(R()R())ofthedynamicbacklightmodulearestripeshapedandthelightemittingregionsR()R()extendacrosstheslitsofthetrackingpanelTheextendingdirectionofthelightemittingregionsR()R()isperpendiculartotheextendingdirectionoftheslitsofthetrackingpanelManyofthelightemittingregionsie,R()R()ofthedynamicbacklightmodulearearrayinanarrayedmannerFigshowsanovelcontrolledcircuitarchitectureofscanningregionsforhighresolutionstereoscopicdisplaywithHzfrequencyusingscanningbacklightmethodAllparametersofthescanningbacklightmethodoperatebydeterminingthesumofturningtimesbetweenLEDbacklightregionsandIfthecountedtimesequalthenthenextbacklightregionbeginsoperatingForaregionscanningbacklightmethod,whenthepanelisfilledinregions(),(),(),and()bythenewimage,thebacklightlightsupforregions(),(),(),and()Inanticipationofregion()ofthepaneldisplayinglefteyeandrighteyeimages,weturnedonregion()ofthebacklightunitandanalogizedtheimageshowninregion(),turningonregionofthebacklightunitAccordingtotheregionscanningthebacklightmethod,whenthenewimagefillsregions()and()ofthepanel,thebacklightlightsupinthecorrespondingregions()and()ToavoidseeingboththeLimageandRimageatthesametime,thebacklightregionR()mustbeturnedoffuntiltheimagefillsR()ThesampleoperativeprinciplesapplytothebacklightregionsofR()Incompleteisolationoftheleftandrightimagechannelssothatoneleaks(leakage)orbleedsintotheotherLookslikeadoubleexposureCrosstalkisaphysicalentityandcanbeobjectivelymeasured,whereasghostingisasubjectivetermIIICROSSTALKANALYSISToavoidghostimages,thebacklightmodularprovidesbacklightcontrolsignalswhicharedependentonthepositionofanassociatedpartofthepanelThesystemisprovidedforLIOUetal:LOWCROSSTALKMULTIVIEWTRACKINGDDISPLAYOFSYNCHROSIGNALLEDSCANNINGBACKLIGHTSYSTEMFigSynchronizationsignalLEDbacklightarchitectureFigSchematicdiagramofscanningbacklightmethodcontrollingsynchronizationtimingbetweenbacklightingandpixelrefresh,independenceofalocationofasectionwithinthedisplaypanelThebacklightunitisseparatedintoseveralregionsLet’stakeregionsastheexampleasinFigthepixelresponsetimeislessthanthreefourthsoftheframetimewhentheilluminationperiodisonequarteroftheframetimeOpticalsensorandCSSpotChromaMeterofluminancecrosstalkmeasurementoftheregions,regionsscanningandstrobebacklightmethodwithoutlenticularFramesequential(pageflip,temporalmultiplexed)process,theprocessisreferredtoasalternateframesequencingCrosstalkisacriticalfactordeterminingtheimagequalityofstereoscopicdisplaysAlsoknownasghostingorleakage,highlevelsofcrosstalkcanmakestereoscopicimageshardtofuseandlackfidelityCrosstalkismeasuredbydisplayingfullblackandfullwhiteinlightemittingregionsR()R()ofthedis

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