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1、1On-Bright confidentialOn-Bright confidentialLED BLULED BLUDriving and ChallengeDriving and Challenge2On-Bright confidentialOn-Bright confidentialOutline 1.LED to CCFL ReplacementnLED backlight benefits analysisnCCFL/LED market share trend2.Small & Middle Size Driving TopologynLED notebook/NetbooknL
2、ED monitornLow-end display3.LED TV Driving Topology4.OB LED Driver Roadmap 5.Q&A3On-Bright confidentialOn-Bright confidentialTV Products Innovations Internet Internet ConnectivityConnectivity3D3D DisplayDisplayHumanHuman InterfaceInterfaceLEDLED BacklightBacklightTV Products InnovationsTV Products I
3、nnovationsLED backlight is very hot4On-Bright confidentialOn-Bright confidentialLED Type White LightCurrent Capabilityn Standard LED - drive current 110%)n Light weight and thin profile6On-Bright confidentialOn-Bright confidentialPower Saving of LED BLU n Low drive voltage to ensure safety operation
4、n The relationship between LED intensity and drive current is linern Lower current is operated to perform the same brightness level that CCFL modulen Power saving of 3050% of CCFL power consumption7On-Bright confidentialOn-Bright confidentialLocal Dimming of TV LED BLU 8On-Bright confidentialOn-Brig
5、ht confidentialNTSC cover CCFL 78%, WLED 80%, RGB LED 110%)Wide Color Gamut 9On-Bright confidentialOn-Bright confidentialNB PCLCD MNTLCD TV Power Saving Light weight Thin profile Small cost premium None Power Saving Dynamic BLU control Cost Reliability Huge LED Amount Thermal compensation Power Savi
6、ng Thin profile Cost Input/output interfaceAdvantageAdvantageChallengeChallengeLED BLU Market Potential ApplicationApplicationHighLow10On-Bright confidentialOn-Bright confidentialLED BLU Market Share 2008200920102011Share Rate (NB)21.90%66.70%89.40%95.20%Share Rate (MNT)0.30%1.90%18.90%35.10%Share R
7、ate (TV)0.30%2.68%21.26%45.29%n Samsung MP LED TV at 2009, Q2Kick off LED TV marketn Low cost Edge type become main stream Help to rise the share rate from CCFLn Power saving features Easy to meet EPA5.0n Will break 50% share 2012Source: Display Search11On-Bright confidentialOn-Bright confidentialLE
8、D Driving Topology-NB 15” panel for example15” panel for example 6 strings, 10 LED per string 20mA6 strings, 10 LED per string 20mA Vout 33V, Pout 4WVout 33V, Pout 4WOB3360 FeaturesOB3360 Features Build-in 60V MOSFETBuild-in 60V MOSFET 8 string output8 string output With 60mA current capability per
9、stringWith 60mA current capability per string 160K/320K/620K/1.2MHz frequency160K/320K/620K/1.2MHz frequency 0100% wide range dimming0100% wide range dimming 3% channel to channel current matching3% channel to channel current matching12On-Bright confidentialOn-Bright confidentialLED Driving Topology
10、-MNT 24” panel for example (1)24” panel for example (1) 12 strings, 15 LED per string 20mA12 strings, 15 LED per string 20mA Vout 50V, Pout 12WVout 50V, Pout 12WOB3362 FeaturesOB3362 Features 12 string output12 string output With 60mA current capability per stringWith 60mA current capability per str
11、ing 150500kHz frequency150500kHz frequency 0100% wide range dimming0100% wide range dimming 3% channel to channel current matching3% channel to channel current matching24” panel for example (2)24” panel for example (2) 12 strings, 15 LED per string 20mA12 strings, 15 LED per string 20mA Vout 33V, Po
12、ut 4WVout 33V, Pout 4Wparallel connection to support larger current application13On-Bright confidentialOn-Bright confidentialLED Driving Topology-Low End Display OB337XOB337X 0.2V reference benefits efficiency0.2V reference benefits efficiency Internal burst and external PWM dimmingInternal burst an
13、d external PWM dimming Output over voltage protectionOutput over voltage protectionOB3372OB3372:Boost,DIP8, built in 60V MOSFET:Boost,DIP8, built in 60V MOSFET OB3370NOB3370N:Boost, SOP8, Controller:Boost, SOP8, Controller OB3370POB3370P:Buck, SOP8, Controller :Buck, SOP8, Controller 26” panel for e
14、xample (2)26” panel for example (2) Single string, 400mASingle string, 400mA Vout 40V, Pout 16WVout 40V, Pout 16W14On-Bright confidentialOn-Bright confidentialLED vs. CCFL Cost Comparison Q3, 2010$USDpremium 28%premium 41%premium 61%premium 43%15On-Bright confidentialOn-Bright confidentialLED TV Mar
15、ket Share Growth Source: Display Search16On-Bright confidentialOn-Bright confidentialLED Backlight for Large Size TV Panel Direct type with Local dimmingDirect type without Local dimmingEdge type backlightHigh Performance Slim ProfileRGB LED / White LED White LED n RGB & Local dimming has power savi
16、ng and high-CR feature High-end usen Edge type solution has low cost feature Main streamDirect Backlight:Better emissionAllowing independently dimming block by blockEdge Backlight:Allowing slim designFewer LED number and lower cost17On-Bright confidentialOn-Bright confidentialLED TV Cost Down Trend Direct typeEdge typeAdvanced edge typeAdvanced edge type2008200920102011struct
