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http://dx.doi.org/10.7469/JKSQM.2022.50.3.425

Improvement for Chromaticity Coordinate Quality of Automotive White LED Packages  

So, Soon Jin (Raytron Co., Ltd.)
Jeoung, Choung Woo (Raytron Co., Ltd.)
Moon, Tae Eul (Raytron Co., Ltd.)
Kim, Jeong Bin (Raytron Co., Ltd.)
Hong, Sung Hoon (Department of Industrial and Information Systems Engineering, Jeonbuk National University)
Publication Information
Journal of Korean Society for Quality Management / v.50, no.3, 2022 , pp. 425-440 More about this Journal
Abstract
Purpose: The purpose of this paper is to improve the chromaticity coordinate quality of white LED packages for automobiles that require high quality and reliability. Methods: The project follows the structured methodology of the Six Sigma DMAIC Roadmap, which consists of Define, Measure, Analyze, Improve and Control phases. Results: A CTQ is determined based on COPQ analysis, and a process map and a XY matrix are utilized for selecting process input variables. Three vital Few Xs are identified through data analysis; amount to mix at one time, deviation by head pumps, and deviation by production magazines, and process improvements are performed for each of the three vital Few Xs. Conclusion: The improved process conditions for the three vital Few Xs are applied to the production line, and the results show that the percent defective of chromaticity coordinate has improved from 1.59% to 0.63% and a financial effect of about 50 million won per year is obtained.
Keywords
Chromaticity Coordinate; DMAIC Roadmap; LED Packages; Quality; Six Sigma;
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Times Cited By KSCI : 8  (Citation Analysis)
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1 Choi, J.Y., Kim, Y.C., Oh, J.T., and Kim, K.Y. 2021. Improvement of Consensus Quality for PoN Blockchain System Using response surface methodology. Journal of Korean Society for Quality Management 49(4):527-537.   DOI
2 Jung, M.Y., Lee, Y.N., and Hong, S.H. 2010. "A case study of a six sigma project for improving assembly line of auto-part manufacturing company. Journal of the Korean Society for Quality Management 38(3):439-448.
3 Kim, J.M., Jung, U., Seo, J.H., and Bae, S.M. 2016. Literature review on the quality innovation in KSQM for 50 years. Journal of Korean Society for Quality Management 44(1):17-28.   DOI
4 Kwon, H.M., Hong, S.H., Lee, M.K., and Lim, S.W. 2016. Literature review on the statistical quality control in journal of korean society for quality management 44(1):1-16.   DOI
5 Dupuis, R. and Krames, M. 2008. History, development, and applications of high-brightness visible light-emitting diodes. Journal of Lightwave Technology 26(9):1154-1171.   DOI
6 Jeon, Y.G., Huh, H.J., Lee, S.B., Park, H.H., and An, B.G. 2020. A study on the quality improvement of mechanical drawing notes lean 6 sigma analysis. Journal of Korean Society for Quality Management 48(3):381-393.   DOI
7 Koh, K.J., Kim, N.Y., and Kim, Y.S. 2019. Process conditions optimizing the yield of power semiconductors. Journal of Korean Society for Quality Management 47(4):725-737.   DOI
8 Lee, S.P., Kwon, H.M., Hong, S.H., and Lee, M.K. 2019. Optimization of the extrusion moulding using design of experiments. Journal of the Korean Institute of Pant Engineering 24(2):13-21.
9 Moon, J.O. and Yoon, S.P. 2017. A study on operational status of the six sigma action in manufacturing industry. Journal of Korean Society for Quality Management 45(1):1-10.   DOI
10 Lee, H.J., Kim, Y.C., and Shin, S.M. 2020. Optimal parameter design for a cryogenic submerged arc welding (SAW) process by utilizing stepwise experimental design and multi-dimensional design space analysis. Journal of Korean Society for Quality Management 48(1):69-86.   DOI
11 Nakamura, S. 2014. Background story of the invention of effcient blue InGaN light emitting diodes. Nobel Lecture 1(1):69-95.
12 So, S. J. and Park, C. B. 2008. Improvement of brightness with Al2O3 passivation layers on the surface of InGaN/GaN-based light-emitting diode chips. Thin Solid Films 516(1):2031-2034.   DOI
13 Sun, C. C., Moreno, I., and Chung, S. H. 2007. Direct LED backlight for large area LCD TVs: brightness analysis. Seventh International Conference on Solid State Lighting 6669:666909-01-666909-10.
14 Wu, T., Ho, C. H., Kuo, H. C., and He, J. H. 2020. Micro-light-emitting diodes with quantum dots in display technology. Light: Science & Applications 9(83):2-23.   DOI
15 David, A. and Whitehead, L. A. 2018. LED-based white light. Comptes Rendus Physique 19(3):169-181.   DOI
16 Nakamura, S., Mukai, T., and Senoh, M. 1994. Candela-class high-brightness InGaN/AlGaN double-heterostructure blue-light-emitting diodes. Applied Physics Letter 64:1697-1689.
17 Sung, S.G., Kim, J.S., and Byun, J.H. 2010. A six sigma application methodology for supply chain quality improvement." Journal of the Korean Society for Quality Management 38(2):180-189.
18 Yang, Y., Qiu, D., Li, Y. Z., Li, R., Duan, W., and Fan, R. 2021. Design of a reflective LED automotive headlamp lighting system based on a free-form surface. Applied Optics 60(28):8910-8914.   DOI
19 Chang, M. H., Das, D., Varde, P. V., and Pecht, M. 2012. Light emitting diodes reliability review. Microelectroincs Reliablity 52(1):762-782.   DOI
20 Chung, J.S., Park, S.S., Kim, J.H., Kwon, H.M., Hong, S.H., and Lee, M.K. 2020. Process optimization for improving resistance welding quality of cylindrical secondary battery. Journal of Korean Society for Quality Management 48(1):69-86.   DOI
21 Gou, F., Hsiang, E. L., Tan, G., Chou, P. T., and Li, Y.L., Lan, Y.F., and Wu, S.T.. 2019. Angular color shift of micro-LED displays. Optics Express 27(12):A746-A757.   DOI
22 Huang, Y., Hsiang, E. L., Deng, M. Y., and Wu, S. T. 2020. Mini-LED, micro-LED and OLED displays: present status and future perspectives. Light: Science & Applications 105(9):2-16.