Study on chromaticity balance for LED exposure system

Cheng-bao Yao; Shu-ying Wang; Xian-wei Rong; Zhong Meng; Wen-jun Sun

doi:10.1117/12.790736

22 February 2008 Study on chromaticity balance for LED exposure system

Cheng-bao Yao, Shu-ying Wang, Xian-wei Rong, Zhong Meng, Wen-jun Sun

Proceedings Volume 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology; 66220F (2008) https://doi.org/10.1117/12.790736
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China

Abstract

A standard white light compounding algorithm based on combination of CCD illumination acquisition with computer control is presented for LEDs. The computer adjust and control the working current of LEDs by using three-color LEDs illumination acquired by CCD camera, achieved chromaticity 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 chromaticity 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 chromaticity coordinates due to work current change of LEDs. Experimental results show that the proposed algorithm achieved lesser chromaticity error uv=0.001 relative to standard white light D₆₅, enhanced chromaticity uniformity of illumination field.

Citation Download Citation

Cheng-bao Yao, Shu-ying Wang, Xian-wei Rong, Zhong Meng, and Wen-jun Sun "Study on chromaticity balance for LED exposure system", Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 66220F (22 February 2008); https://doi.org/10.1117/12.790736

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