一种圆环LED侧入式背光模组设计

侧入式背光板能有效地减少显示背光模组的厚度和背光所需的LED光源数目,为获得均匀照度的侧入背光模组,介绍一种圆环侧入式导光板结构。推导导光板中网点的设计规律,得到圆环侧入式导光板的网点大小的分布函数。利用VBA语言编程在CAD中生成网点分布,结合软件模拟分析,验证了导光板显示区域中光照亮度均匀性达到90％以上,满足了侧入式背光模组中圆环形导光板工程设计上的要求。     

导光板底面熔合微棱镜出射亮度规律研究

基于导光板底面直接熔合微棱镜取代目前背光系统平面反射膜和网点两层结构,推导了棱镜底角和出射亮度方向角之间的关系,提出导光板出射亮度方向角与棱镜远近光源底角的解析公式.用LightTools软件对导光板进行建模仿真,通过改变棱镜两个底角,得到出射亮度峰值方向和底角之间的变化规律.理论值与模拟仿真值基本符合,为背光模组一体化的研究提供理论和实验依据.依据上述规律,设计出一体化导光板结构,其中,微棱镜近光源角为86°,远光源角为37°,亮度达到现行3M背光系统指标.     

手机侧背光照明导光板设计模拟

 为了提高手机侧背光照明导光板的亮度及亮度均匀性,对上表面为41 mm×26 mm的楔形导光板进行了模拟仿真,并对导光板底面不同的印刷式散射网点排布、不同的楔形导光板底面角度及不同的球缺形凸包网点排布进行了研究。结果显示,导光板底面排布印刷式散射网点时,导光板上表面亮度分布的均匀性较差,而出射光通量的百分比小于26%;当导光板底面排布球缺形凸包网点时,导光板上表面亮度分布的均匀性得到提高,出射光通量的百分比提高10%。楔形导光板底面角度81°时的出光效果优于85°时的效果。     

侧入式导光板的激光微加工技术的验证研究（英文）

从设计、仿真与加工入手研究液晶背光模组中侧入式导光板的激光微加工技术.通过光学软件构建导光板的光学结构并采用蒙特卡洛光线追迹方法进行模拟仿真,结果表明具有渐变密度分布的微结构能够提供高均匀性的光输出.基于仿真结果,运用激光微加工技术进行验证设计.激光微加工获得的微结构在100倍光学显微镜放大测量下尺寸约为30.14μm,接近于设计值30μm,同时对单个微结构的3D表面形貌特征进行分析.十组采用激光微加工技术与丝网印刷技术加工的导光板分别安装至侧入式背光模组样机中进行对比.对比结果显示,激光微加工的导光板相比于传统的丝网印刷技术具有更好的光学均匀性和更低的色差,均匀性提高了6.2%,而色差下降了0.002 7.激光微加工技术快而简单,且整个加工过程是完全环保的,具备高性能、自动化生产和易于薄型化的优点.     

导光板散射网点的布局与出光均匀性的研究

从背光模组的基本结构出发,通过理论分析确定了影响导光板散射网点排布的公式,证明了散射网点的排布规律对背光模组出光均匀度有影响。对一款背光模组商品建立了简化模型,通过光学软件TracePro模拟分析以及实验验证,证明了背光模组商品的出光均匀度还有提升的可能性。在此基础上,又重点分析了散射网点行间距的变化值,散射网点直径和散射网点初始行间距对导光板出光均匀度的影响。经过反复仿真模拟,取得了一组参数值,可以使优化后的导光板出光均匀度比背光模组商品的出光均匀度好。研究的结论可作为导光板散射网点设计的参考,对背光模组的设计具有指导意义。     

单顶角结构LED背光模组的设计与优化

由于LED（发光二极管）具有寿命长、色域宽、功耗低和环保（传统的光源CCFL含有汞气）等特性,在背光模组中采用LED代替CCFL（冷阴极荧光灯）是一种趋势。采用单光源顶角入射结构设计一个5.08cm(2inch)液晶背光模组。针对LED作为点光源带来的亮度不均匀的问题,采用旋转LED的入射角度和区域分割设计的方法,有效地解决了LED液晶背光模组中存在亮斑和暗区等不良的现象。通过模拟实验,可以得到光源出射均匀度为80.06%的导光板。     

导光板网点平均密度范围的最优化研究

针对导光板(LGP)网点分布设计进行了研究,提出了以导光板网点最佳平均密度(BANDD)范围的定义来阐述导光板网点的最优化设计。根据导光板导光理论建立背光源模组(BLM)的光学模型,并仿真了模型在不同均匀网点密度(NDD)下性能的变化,结果表明在0.1~0.4之间的网点密度其出光效率与均匀性达到相对平衡。进一步对0.1~0.4范围内的网点密度进行网点排布优化以提高其均匀性,仿真结果表明网点密度在0.2~0.35范围内的网点可以达到设计阶段对均匀性指标的要求。加工了相应的实验样品,验证了导光板最佳平均网点密度范围在0.25左右,与理论相符合。该研究结果对于实际开发具有一定的指导意义,将有助于加快背光源模组的开发进度,减少开发版次,并降低背光源模组的开发成本。     

手机导光板熔合微光学阵列研究

为了研究手机侧发光背光模组,理论分析并模拟了在导光板表面直接熔合微光学结构的手机背光系统.结果表明,熔合微光学结构后,手机背光系统的出射光场发生变化,使得部分光线在偏离视场中心55°的方向上会聚,为设计新型集成手机微光学导光板奠定基础.     

机载平视显示器数字像源背光组件设计

随着COB封装技术发展,采用LED芯片构建液晶显示器背光组件成为一种新的思路;提出了LED芯片COB板结合配光透镜阵列的透镜阵列型COB新颖背光组件;通过LIGHTTOOLS软件构建了3.8Inch机载平视显示器数字像源背光组件模型,仿真分析照度均匀性达到98%,空间亮度均匀性超过85%,光能利用率超过90%。与LED芯片COB板背光组件、及机载平视显示器正用数字像源LED灯珠阵列背光组件照度、空间亮度和强度视角分布进行了仿真对比,在同样输出3150Lumen情况下,透镜阵列型COB背光组件照度超过6.6×10~5 Lux、空间亮度接近2.0×10~6 Nit,远远超过其他两种背光形式,同时保持了与LED灯珠阵列背光基本相同的视角包络。     

一种新颖微型液晶显示器背光设计技术

针对目前机载头盔显示系统中的微型液晶显示器背光模组亮度和均匀性不足问题,提出了一种新颖的微型液晶显示器背光结构及设计理论,并通过CODEV软件设计了背光光学系统,利用LIGHTTOOLS软件对背光模组进行了配光效果仿真,结果证明当采用85lm绿色LUXEONRebel LEDS作光源时,其输出光亮度接近160 000cd/m2,均匀性大于85%,功耗仅有1.25 W,完全满足了机载头盔显示系统的要求.     

Prism-pattern design of an LCD light guide plate using a neural-network optical model

This paper proposes a neural-network optical model for a backlight module of a liquid crystal display (LCD) to expedite the design of the light-scattering prism-pattern of its light guide plate (LGP). First, the prism surface of a light guide plate is divided into several equal regions. Then the neural-network optical model is implemented using a back-propagation neural network to establish the relationship between the distribution density of the prism pattern and the exiting-light luminance of the LGP at each region. The input–output patterns for the neural network training and verification are generated using orthogonal arrays and ASAP simulation. Then a for-loop computational algorithm is executed to search an approximately optimal distribution density of the prism pattern using the neural-network optical model such that high luminance uniformity is achieved. It is demonstrated by the case study of a 13 in. LCD backlight module that luminance uniformity could reach 93.1%. Thus it can be concluded that the developed neural-network optical model effectively expedites the LGP prism-pattern design.     

Optical characteristics of LGP depending on the scattering pattern orientation for flat-type LED lighting

In flat-type light-emitting-diode (LED) lighting systems, a planar light is formed using a luminance source positioned on the side of the system and light guide panel (LGP) or reflecting plates. Thus, such systems are favorable for their thinness, which allows a relatively small number of LEDs to be used. However, the application of a high-power LED light to a large-area lighting system yields Lambertian luminaires; therefore, a point or a discomfort glare is produced, which generally causes degradation of the luminance efficiency and uniformity. In this study, we solved the problems of luminance non-uniformity and inefficiency by adjusting the orientation of an applied LGP scattered pattern and removing the remaining glare. Through computer simulation, optical characteristics that increase the efficiency even in the case of low-output LEDs were found. Specifically, a scattered pattern vertically oriented relative to the direction of the incident light improves the luminance uniformity at the side of the system, while a scattered pattern oriented parallel to the direction of the incident light plays the role of a waveguide. We implemented a flat-type LED lighting system by fabricating a large-area LGP based on the computer-simulation results and using an extremely sensitive laser. The optical characteristics observed using the laser-processed LGP were identical to those obtained in the computer simulation. Therefore, for large-area flat-type LED lighting systems, we confirmed that adjusting the orientation of the LGP scattered pattern can increase the luminance efficiency and uniformity.     

亮度均匀的LED路灯透镜设计与研究

针对路灯照明系统,设计了一种照度均匀和亮度均匀的LED路灯透镜。通过分析LED光源角度分布与目标面照度的关系引用了一种简化的线性校正函数。不同的道路亮度系数,选用合适的K值,设计基于自由曲面的亮度均匀路灯透镜。利用光学软件进行仿真,结果显示中间向边缘逐渐减弱的渐变照度分布有利于路灯照明亮度的均匀。通过注塑成型工艺加工了该透镜,并制作了一盏路灯进行配光和照度的测试。结果表明该透镜设计满足渐变照度分布的矩形光斑照明。采用Dialux软件对路灯照明效果进行评估,显示该路灯透镜设计,横向和纵向亮度均匀性达到0．6以上,满足道路照明的亮度均匀性要求。     

Analysis of the laser patterning inside light guide panel

The objective of this research is to evaluate the feasibility of the internal patterning in the light guide panel (LGP) by applying laser engraving. LGP fabricated by the internal patterning is proposed as it offers better efficiency than is provided by bottom surface patterning. The patterns fabricated by laser engraving system could improve efficiency by approximately 40%, requiring less energy consumption in average brightness and uniformity than required by bottom surface patterned devices. Internal scatters were fabricated by Q-switched 2nd harmonic Nd:YAG laser engraving system. The performance of the fabricated LGPs was measured and its results analyzed. Modification of the shape of the LGP patterns from the simple geometry has been investigated to control the uniformity. The proposed internal scatter embedded LGP with laser engraving could provide an alternative method to conventional bottom surface scatters type with optimized patterns and geometry.     

具有凸台结构的高照明均匀度倒置型植物光源设计

针对现有植物工厂采用的植物培养架照度、混色均匀度差导致农产品作物品质参差不齐的现状,提出一种高混光、高混色均匀度的植物培养架设计方案。不同于光源在上种植面在下的培养架设计模式,将红、蓝LED灯珠间隔排列阵列光源安装在植物种植平面上的凸台上,并把培养架顶部设计成漫反射面。漫反射面的引入起到增加混光距离的作用,提高光线耦合程度,从而达到了提高混光、混色均匀度的效果。进一步引入光量子通量密度均匀度以及混色均匀度共同作为考察指标,利用Taguchi方法设计并进行实验,研究不同因子对植物种植区光源均匀性的影响,再利用ANOVA理论分析了各因子对品质的影响程度多次优化后,最终获得照度均匀度为94.58%、混色均匀度为90%、能量利用率为41.42%的最优系统设计方案。然后研究了不同配光曲线的灯珠对培养架均匀度的影响,最后通过测量植物在不同高度时种植面和植物表面的照度及光谱的分布情况检测植物的生长是否会遮挡光线。结果表明该植物照明系统可以在植物生长过程中提供均匀的照明,遮挡问题几乎可以忽略不计。     

Illumination technique based on integrating sphere with an unequal radius, hyper-uniform luminance and large-field angle

In order to meet the measurement requirements of image sensors’ uniformity of the CCD system with a large-field angle, the design for the form and structure of the integrating sphere, with 600–800 mm and hyper-uniform luminance double hemisphere is presented. LightTools software is used for simulation. The simulation result indicates that the compact structure of the integrating sphere with asymmetric double hemisphere renders both the design values and systematic performance parameters superior to those of the common integrating sphere. The integrating sphere system designed is manufactured and its optical parameters are tested. The test result indicates that at the outlet of the integrating sphere, the variation of illuminance is less than 2.3%, and the variation of luminance on the inner surface is less than 4.4%. Hence, it is concluded that this system can be widely utilized in measuring image sensors’ uniformity of the photoelectric imaging system with a large-field angle.     

大视场CCD成像系统像面均匀性测试技术研究

以光度学为理论基础,研究了大视场CCD成像系统像面均匀性测试技术。论述了600~800mm非对称、双半球不等半径积分球的设计方案。对像面均匀性测试系统的积分球出口进行了测试,出口处的照度不均匀性不高于2.3%,照度不稳定性不高于2.7%,积分球后半球内表面的亮度不均匀性不高于4.4%。在对测试结果进行误差分析的基础上,对大视场CCD摄像机进行了实际测试。结果表明,该装置可广泛应用于光电成像系统的像面均匀性测量。