20 November 2007 Study on chroma balance based on grating spectrometer for LED
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Abstract
A standard white light compounding algorithm based on combination of chroma coordinates acquisition system with computer working current control system is presented for three-color LED. The chroma coordinates acquisition system consist of grating spectrometer and integrating sphere. The computer adjust and control the working current of three-color LED, then achieved chroma coordinates error between the compounded white light and standard white light D65, until the chroma coordinates is less than the threshold beforehand set by this technique. The compounded white light meet the chroma error demanded that is able to be changed, at the same time the chroma coordinates acquisition system and the working current control system are eliminated. The proposed algorithm the offset of central wavelength and the change of chroma coordinates due to working current variety for LEDs. 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.
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Wen-jun Sun, Shu-ying Wang, Yan-zong Yin, Xian-wei Rong, Zhong Meng, "Study on chroma balance based on grating spectrometer for LED", Proc. SPIE 6828, Light-Emitting Diode Materials and Devices II, 68280Y (20 November 2007); doi: 10.1117/12.754474; https://doi.org/10.1117/12.754474
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