应用在大尺寸LCD背照明的LED元件设计  

LED Design Using for Large Dimension LCD Backlight

作　　者：常军[1] 杨东升[2] 孙智慧[1] 翁志成[3] 姜会林[4] 任涛[4] 

机构地区：[1]北京理工大学信息学院,北京100081 [2]北京京东方茶谷电子有限公司,北京100026 [3]中国科学院长春光学精密机械与物理研究所,吉林长春130022 [4]长春理工大学,吉林长春130022

出　　处：《发光学报》2008年第1期195-199,共5页Chinese Journal of Luminescence

基　　金：北京市科委科技计划资助项目(D0306006040221)

摘　　要：传统的薄膜晶体管液晶显示器(thin film transistor liquid crystal display,TFT-LCD)通常采用冷阴极荧光灯(cold cathode fluorescent lamps,CCFL)作为背光光源。相比较而言,由于发光二极管(LED)TFT-LCD背光源系统色彩还原性好、对比度高、亮度高,其色域是传统CCFL背光源的150%以上,最近几年,RGBLED背光源已经逐渐成为大尺寸背光源发展的主要方向。大尺寸LED背光系统结构主要采用直下式和侧式结构。直下式背光源具有结构简单、光利用率高的特点,是目前大尺寸液晶显示背光源的首选。以RGBLED作为光源,通过对LED光场分布的模拟分析,提出一种新的直下式背光源的光学设计。背光源模拟表明,该背光源亮度均匀性大于80%,色差小于0.01。Usually, CCFL is used as the back light sources for the traditional thin film transistor liquid crystal display. Now, among several light sources for LCD backlight, LED is the most competitive one. The paper analyses the performance of LED and designs a new LED for large area direct LCD backlight ,which is simple and has a good performance. In order to test the LED designed by us, we design a 26＇ LCD backlight finally. The simulation result indicates that the performance of the LED designed by us is good enough to meet the requirement of LCD backlight about luminance uniformity and color balance.

关 键 词：LED LCD背光源 大尺寸背光源 直下式 

分 类 号：O482.31[理学—固体物理]