led背光技术的发展与挑战

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1、LEDBLUDrivingandChallengeOutlineLEDtoCCFLReplacementLEDbacklightbenefitsanalysisCCFL/LEDmarketsharetrendSmall&MiddleSizeDrivingTopologyLEDnotebook/NetbookLEDmonitorLow-enddisplayLEDTVDrivingTopologyOBLEDDriverRoadmapQ&ATVProductsInnovationsInternetConnectivity3DD

2、isplayHumanInterfaceLEDBacklightTVProductsInnovationsLEDbacklightisveryhotLEDTypeWhiteLightCurrentCapabilityStandardLED-drivecurrent<50mAHighcurrentLED-drivecurrent50-150mAHighpowerLED-drivecurrent150-1000mA+ColorWhiteLEDsRed,GreenandBlueLEDs(Combinedwhite)Forwar

3、dvoltagedependsoncolorRed~2V,Green~3.5V,Blue/White~3.5-4VBenefitsofLEDBacklightPowersaving(30~40%savingfor12~14”NB)Longerlifetime(+50,000hrsvs.~20,000hrsofCCFL)0~100%widedimmingrange(upto20KHzPWMdimming,audionoisefree)LowvoltagedriverreducescomplexitypowerdesignE

4、nvironmentalfriendly(CCFLcontainsHg)LocaldimmingforpowersavingandhigherCR(Largesizedirecttypebacklightonly)Widecolorgamut(NTSC,CCFL~78%,WLED~80%,RGBLED>110%)LightweightandthinprofilePowerSavingofLEDBLULowdrivevoltagetoensuresafetyoperationTherelationshipbetweenLE

5、DintensityanddrivecurrentislinerLowercurrentisoperatedtoperformthesamebrightnesslevelthatCCFLmodulePowersavingof30~50%ofCCFLpowerconsumptionLocalDimmingofTVLEDBLUNTSCcoverCCFL~78%,WLED~80%,RGBLED>110%)WideColorGamutNBPCLCDMNTLCDTV?PowerSaving?Lightweight?Thinprof

6、ileSmallcostpremium?None?PowerSaving?DynamicBLUcontrol?Cost?Reliability?HugeLEDAmountThermalcompensation?PowerSavingThinprofile?Cost?Input/outputinterfaceAdvantageChallengeLEDBLUMarketPotentialApplicationHighLowLEDBLUMarketShare2008200920102011ShareRate(NB)21.90%

7、66.70%89.40%95.20%ShareRate(MNT)0.30%1.90%18.90%35.10%ShareRate(TV)0.30%2.68%21.26%45.29%SamsungMPLEDTVat2009,Q2KickoffLEDTVmarketLowcostEdgetypebecomemainstreamHelptorisetheshareratefromCCFLPowersavingfeaturesEasytomeetEPA5.0Willbreak50%share~2012Source:Displ

8、aySearchLEDDrivingTopology-NB15”panelforexample6strings,10LEDperstring@20mAVout~33V,Pout~4WOB3360FeaturesBuild-in60VMOSFET8stringoutputWith60mAcurrentcapabilit