LED背光技术的发展与挑战.pptVIP

作者简介： 张昌山先生毕业于西南交通大学电子工程系，长期以来一直致力于背光驱动市场的产品规划及技术研究，张先生于2005年正式加入昂宝电子（上海）有限公司，期间一直担任系统部总监，全权负责公司电管理芯片之应用团队及管理。 张昌山先生在相关领域拥有丰富的实际应用经验，在LED照明驱动、背光驱动均有自己独到的见解，张先生在该领域还拥有多项国内外专利。 * On-Bright confidential LITE ON Analog IC Marketing * LED BLU Driving and Challenge Outline LED to CCFL Replacement LED backlight benefits analysis CCFL/LED market share trend Small Middle Size Driving Topology LED notebook/Netbook LED monitor Low-end display LED TV Driving Topology OB LED Driver Roadmap QA TV Products Innovations Internet Connectivity 3D Display Human Interface LED Backlight TV Products Innovations LED backlight is very hot LED Type White Light Current Capability Standard LED - drive current 50mA High current LED - drive current 50-150mA High power LED - drive current 150-1000mA+ Color White LEDs Red, Green and Blue LEDs (Combined white) Forward voltage depends on color Red ~2V, Green ~3.5V, Blue/White ~3.5-4V Benefits of LED Backlight Power saving (30~40% saving for 12~14” NB) Longer life time (+50,000 hrs vs. ~20,000hrs of CCFL) 0~100% wide dimming range (up to 20KHz PWM dimming, audio noise free) Low voltage driver reduces complexity power design Environmental friendly (CCFL contains Hg) Local dimming for power saving and higher CR (Large size direct type backlight only) Wide color gamut (NTSC, CCFL ~78%, WLED ~80%, RGB LED 110%) Light weight and thin profile Power Saving of LED BLU Low drive voltage to ensure safety operation The relationship between LED intensity and drive current is liner Lower current is operated to perform the same brightness level that CCFL module Power saving of 30~50% of CCFL power consumption Local Dimming of TV LED BLU NTSC cover CCFL ~78%, WLED ~80%, RGB LED 110%) Wide Color Gamut NB PC LCD MNT LCD TV ?? Power Saving ?? Light weight ?? Thin profile Small cost premium ?? None ?? Power Saving ?? Dynamic BLU control ?? Cost ?? Reliability ?? Huge LED Amount Thermal compensat