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Proceedings Paper

Study on chromaticity balance for LED exposure system
Author(s): Cheng-bao Yao; Shu-ying Wang; Xian-wei Rong; Zhong Meng; Wen-jun Sun
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Paper 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.

Paper Details

Date Published: 22 February 2008
PDF: 7 pages
Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 66220F (22 February 2008); doi: 10.1117/12.790736
Show Author Affiliations
Cheng-bao Yao, Harbin Normal Univ. (China)
Shu-ying Wang, Harbin Normal Univ. (China)
Xian-wei Rong, Harbin Normal Univ. (China)
Zhong Meng, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Wen-jun Sun, Harbin Normal Univ. (China)


Published in SPIE Proceedings Vol. 6622:
International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology

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