LED背光模组设计.pdf

, 如何利用导光板将LED这种点光源转化成均匀的面光源,同时保证必要的光能量利用率,是背光源面临的两大议题。尤其在大尺寸背光模组中,为降低成本, 增光膜、扩散膜,甚至反射片都在寻求或正在进行与导光板的整合,使得现在的导光板设计更为复杂,也具有更重要的意义. 本论文首先介绍了近年来全球平板显示的发展及未来市场预测,阐明了必要的理论基础,然后借助照明软件进行模拟,,本文将介绍一种以LED做光源、侧光照明式的微结构设计方法,利用贝赛尔曲线和多项式曲线拟合,在不同尺寸背光模组的导光板表面上加以合理设计分布,最终得到亮度均匀,光能利用率较高的结果。针对小尺寸的背光模组,文中利用图像处理中的方式,设定合理的照度阈值划分导光板,结合各个区域内网点的截止半径,采用半径渐变的方式重新进行规则网点分布,最后进行多项式的拟合,达到均匀性超过90%的亮度分布。针对大尺寸的背光模组,本文提出了一种新的导光板结构设计方案,在其上下表面同时进行V型槽设计,可以省略增光膜的使用,其效果可与使用增光膜时相媲美,借此可以有效的减小模组厚度,降低模组成本,更好地实现背光模组的轻薄化。结合将导光板的非光源耦合面加以镀膜的方法(膜层性质为高反射率的材料),可极大地提高光能利用效率。经软件模拟验证,其亮度均匀性达到88%,光能利用可达65%。关键词:背光模组、导光板、lED光源、图像处理、v型槽、镀膜 Abstract Nowadays,there is arapid development inthetradeofLED,and itsapplication throughout the fieldoflighting,display,cars’lamp thispaper,we focus onthedesignoflightguide asitisthe啦part of thebaddight main topic ishow to仃ansform thepoint source tothesurface inthemeanwhile achieving thehigh ale interested in theintegration of BEF, diffuser,w衄reflective meads alotespecially inlarge LCD. Inthispaper,we make use ofthelighting software tosimulate thebacHight modular and brought up mal∞a designof edge·lit oile tOthinner We taketheadvantage ofreasonable design ofmicro-structure on thefightguide together with theBezicrandpolynomial polyfit tOgetgood uniform luminance andhigh hasbeenemployed here todeal with the area division,threshold issetafteriterativeoptimization tOmake sure the division random and r-cutmethod isthenintroduced tO insurethe tOpolyfit the radiiofthe dotsandtheresultsshow auniform luminalice of90%. Forthelarge sizeofbacklightmodular,we putup with anewmethod thatmake the V-cut on both sides ofthe lightguidc witch isequal tO theeffectwith BEF,. integrating theBEF(Brightness EnhancementFirm)with by coating on thenon-i