LED曝光系统色度平衡研究  

THE STUDY OF CHROMA BALANCE FOR LED EXPOSURE SYSTEM

作　　者：孙英杰[1] 卜文斌[2] 孙文军[2] 

机构地区：[1]黑龙江省教育学院 [2]哈尔滨师范大学

出　　处：《哈尔滨师范大学自然科学学报》2008年第2期54-57,共4页Natural Science Journal of Harbin Normal University

基　　金：黑龙江省青年基金(QC06C043);哈尔滨市青年创新基金(RFQXG055);黑龙江省教育厅项目(11521063)

摘　　要：提出了CCD照度采集与计算机控制相结合的LED标准白光源合成方法.计算机利用CCD采集的三色LED照度控制LED的工作电流,使合成白光与标准白光源D65色度坐标误差小于预先设定的阈值,便可得到需要的标准白光源.合成的白光满足照明要求后便可以去掉CCD照度采集系统.该方法提高了光能利用率,消除了LED中心波长及色度坐标随电流变化所引起的偏移,提高了照明光场的色度均匀性.实验结果表明该方法合成的白光可以获得较小的色度误差uv=0.001,且可以根据需要调节色度误差.A standard white light compounding algorithm based on combination of CCD illumination acquisition with computer control is presented for LED. The computer adjust and control the working current of LED by using three -color LED illumination acquired by CCD camera, achieved chroma coordinates error between compounded white light and standard white light D65 less than the threshold beforehand setted by this technique, then acquiring needed standard white light. Compounded white light meet the chroma error demand that is able to be changed , at the same time the CCD illumination acquisition system is eliminated. The proposed algorithm improved the light energy utilization efficiency of LED, and eliminated the offset of central wavelength and chroma coordinates due to work current change of LED. Experimental results show that the proposed algorithm achieved lesser chroma error uv = 0.001 relative to standard white light D65, enhanced chroma uniformity of illumination field.

关 键 词：发光二极管 色度误差 色度平衡 光谱功率 

分 类 号：TN312.8[电子电信—物理电子学] O432.3[机械工程—光学工程]