用于液晶显示屏幕检测的大口径小角度LED光源设计  

Design of LED Source with Large Aperture and Small View Angle Used in the LCD Detection

作　　者：王尧[1,2] 荆雷[1] 党博石[1] 孙强[1] 刘英[1] 刘华[1] 郝剑[1,2] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《光学学报》2015年第10期178-185,共8页Acta Optica Sinica

基　　金：国家重大科学仪器设备开发专项(2013YQ14051702);国家863计划(2013AA03A116);吉林省科技发展计划项目(20130206018GX)

摘　　要：针对液晶显示屏幕检测中光源照明均匀性较差的问题,基于非成像光学理论提出了一种大口径小角度的发光二极管(LED)照明光源设计方法。光源采用阵列式照明方式,对单颗LED设计菲涅耳透镜实现小角度的准直照明;推导阵列均匀照度分布条件并利用Trace Pro软件进行优化,确定阵列最优间距;最终通过在照明面上的光斑拼接叠加实现均匀矩形照明。照明光源由12×9个配光单元形成均匀方形阵列排布,每两个配光单元间距30 mm。仿真结果表明,光源的发光角度小于±10°,在距光源170 mm的照明面上,平均照度大于45000 lx,非均匀性3.8%,均满足设计指标。该方法设计的阵列式光源无论平均照度还是照度均匀性均比现有光源有明显优势。In order to increase the illuminance uniformity of the source used in the liquid crystal display（LCD） detection, based on nonimaging optics, a method of a light emitting diode （LED） source with large aperture and small view angle is proposed in this paper. The illumination system of this source is realized by array of LEDs and the lenses. For a single LED, Fresnel lens is designed to collimate the beam with small view anglethen, the optimal distance of the array is obtained by deducing the uniform illumination condition and optimizing it with TracePro. Finally, the uniform rectangular illumination is achieved through splicing superposition the spot on the illuminating surface. The illumination source consists of 12×9 optical units which are arranged in uniform rectangle, and the distance between every two optical units is 30 mm. The simulation results show that the viewing angle of the source is less than ＋ 10% At the target surface 170 mm away from the source, the average illuminance is greater than 45000 lx, and the nonuniformity is 3.8%. All of the indexes meet the design requirements. Comparing with the existed source, the arrayed source designed in this paper has obvious advantages whether on the average illuminance or the illuminance uniformity.

关 键 词：光学设计 非成像光学 匀光照明 阵列式照明 液晶显示器检测 非均匀性 

分 类 号：O439[机械工程—光学工程]