第20卷第7期 2012年7月
1004-924X(2012)07-1455-08
文章编号
光学精密工程
Optics and Precision Engineering
Vol.20No.7
Jul.2012
用于侧出式发光二极管背光的全局动态调光算法
冯奇斌"，何会杰”，张伟伟”，方勇，吕国强1
（1.合肥工业大学特种显示技术教育部重点实验室特种显示技术国家工程实验室现代显示技术省部共建国家重点实验室光电技术研究院，安徽合肥230009：
2.合肥工业大学仪器科学与光电工程学院，安徽合肥230009）
摘要：结合背光源发展趋势，提出了适用于侧出式LED背光的全局动态调光算法。首先，根据显示图片平均灰度值、最大灰度值和平均值的差值确定背光调光亮度。接着，基于S曲线对液晶像素亮度值进行补偿。亮度大于S曲线拐点的像索的调整因子大于1，小于拐点的像素的调整固子小于1，以此有效提高静态对比度，并且不会引人溢出失真。对算法进行了伤真分析并开发了原理样机进行实际验证。结果表明：采用动态调光算法的液晶显示器的功耗严重依赖于显示内容；显示40幅不同类型的图片时，平均整机节能为9.39%；静态对比度提高了124.7%。采用本文出的全局动态调
光算法的侧出式背光具有成本低、体积轻薄、节能、对比度高的优点。关键调：液晶显示；发光二板管骨光；全局调光；能耗；对比度
中图分类号：TN141.9;TN312.8
文献标识码：A
doi;10.3788/OPE,20122007.1455
Globaldimmingalgorithmforside-litLEDbacklights FENG Qi-bin', HE Hui-jie", ZHANG Wei-wei’, FANG Yong', LU Guo-qiang'(l.KeyLaboratory of Special DisplayTechnology of theMinistry of Education,
National Engineering Laboratory of Special DisplayTechnology,National Key Laboratory of AduancedDisplayTechnology,AcademyofPhotoelectricTechnology,Hefei University
of Technology，Hefei 230o09，China;
2.School of Instrumentationand Opto-electronics Engineering,HefeiUniversity
ofTechnology，Hefei230009，China)
Correspondingauthor，E-mail:guoqianglo@hfut.edu.cn
Abstract: In consideration of the development trends of backlights, a global dirnming algorithm for side-lit backlights was proposed to solve the problems of Liquid Crystal Devices(LCDs) in low con trast ratio and high power consumption. The backlight dimming level was decided by the average lu minance and the difference between the average and max grayscales of all subpixels. Then , the S-shaped function was involved to improve the static contrast ratio, by which the pixels with the grayscales more than the turning point of the curve could be become brighter and those less than the turning point could become darker, so that the static contrast ratio was improved efficiently. The al-
收稿日期：2012-01-18；修订日期：2012-02-10.
基金项目：国家973重点基础研究发展计划资助项目（No.2010CB334704，No.2012CB7234C6)，国家青年科学基金
资助项目（No.61107014)，广东省科技战略性新兴产业重大专项资助项目（No.2011A010801003)