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浏览/检索结果: 共2条，第1-2条 帮助 限定条件 内容类型：会议论文     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 Study on chromaticity balance for LED exposure system (EI CONFERENCE) 会议论文 International Symposium on Photoelectronic Detection and Imaging 2007 - Laser, Ultraviolet, and Terahertz Technology, September 9, 2007 - September 12, 2007, Beijing, China Yao C.-B.; Wang S.-Y.; Rong X.-W.; Meng Z.; Sun W.-J. 收藏  |  浏览/下载：13/0  |  提交时间：2013/03/25 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.   Study on chroma balance based on grating spectrometer for LED (EI CONFERENCE) 会议论文 Light-Emitting Diode Materials and Devices II, November 12, 2007 - November 14, 2007, Beijing, China Sun W.-J.; Wang S.-Y.; Yin Y.-Z.; Rong X.-W.; Meng Z. 收藏  |  浏览/下载：19/0  |  提交时间：2013/03/25 A standard white light compounding algorithm based on combination of choma 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.