Zheng Jinbo, Qian Keyuan
Appl Opt. 2013 Oct 1;52(28):7022-7. doi: 10.1364/AO.52.007022.
This study presents a new method for achieving uniform illumination of an LED array by designing single LED illumination distribution (SLID) on the target plane. The SLID with the least coefficient of variation of the root mean squared error is calculated. For square LED arrays, the uniformity of illumination reaches 0.94. A secondary lens was designed to achieve the calculated SLID. Simulation results show that the uniformity of illumination reaches 0.92 when the distance-height ratio is 3.33. The calculated SLID can be used in different distance-height ratios. When the distance-height ratio is 5, the uniformity of illumination reaches 0.91. The calculation method can be used in different kinds of LED arrays. A feedback method of lens design is presented for a real direct-type backlight system.
本研究提出了一种通过在目标平面上设计单个LED照明分布（SLID）来实现LED阵列均匀照明的新方法。计算了均方根误差变异系数最小的SLID。对于方形LED阵列，照明均匀度达到0.94。设计了一个二次透镜来实现计算出的SLID。仿真结果表明，当距离-高度比为3.33时，照明均匀度达到0.92。计算出的SLID可用于不同的距离-高度比。当距离-高度比为5时，照明均匀度达到0.91。该计算方法可用于不同类型的LED阵列。针对实际的直下式背光系统，提出了一种透镜设计的反馈方法。
