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Laser Marking for Light Guide Panel using Design of Experiment and Web-based Prototyping System  

Kang Hyuk-Jin (서울대학교 기계항공공학부)
Kim Hyung-Jung (서울대학교 기계항공공학부)
Chu Won-Sik (서울대학교 기계항공공학부)
Ahn Sung-Hoon (서울대학교 기계항공공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.23, no.4, 2006 , pp. 91-98 More about this Journal
Abstract
A light guide panel (LGP) is an element of the LCD back light unit, which is used for display devices. In this study, the laser marking process is applied to the fabrication of light guide panels as the new fabrication process. In order to obtain a light guide panel which has high luminance and uniformity, four principal parameters such as power, scanning speed, ratio of line gap, and number of line were selected. A Web-based design tool was developed to generate patterns of light guide panel at any location, and the tool may assist the designer to develop optimized patterns. Topcon-BM7 was used for luminance measurement of each specimen with $100mm{\times}100mm$ area. By Taguchi method optimized levels of each parameters were found, and luminance of $3523cd/cm^2$ and uniformity of 92% were achieved using the laser machined BLU.
Keywords
Back light unit; Light guide panel; $CO_2$ laser marking; Design of experiment; Web-based system;
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Times Cited By KSCI : 2  (Citation Analysis)
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1 Zhou, B. H. and Mahdavian, S. M., 'Experimental and Theoretical Analyses of Cutting Nonmetallic Materials by Low Power $CO_2$-laser,', Journal of Materials Processing Technology, Vol. 146, pp. 188-192, 2004   DOI   ScienceOn
2 Liu, Z., Feng, Y. and Yi, X., 'Coupling Effects of the Number of Pulses, Pulse Repetition Rate and Fluence during Laser PMMA Ablation,' Applied Surface Science, Vol. 165, pp. 303 - 308, 2000   DOI   ScienceOn
3 Wang, S. C., Lee, C. Y. and Chen, H. P., 'Thermoplastic Microchannel Fabrication Using Carbon Dioxide Laser Ablation,' Journal of the Chromatography A, 2005. (Article in press)   DOI   ScienceOn
4 Lin, C. S., Wu, W. Z., Lay, Y. L. and Chang, M. W., 'A Digital Image-based Measurement System for a LCD Backlight Module,' Optics & Laser Technology, Vol. 33, pp. 499 - 505, 2001   DOI   ScienceOn
5 Baek, N. K. and Kim, D. E., 'Optimization of Laser Lithography Micropatterning Technique based on Taguchi Method,' Journal of Korean Society of Precision Engineering, Vol. 19, No.7, pp. 59 - 64, 2002   과학기술학회마을
6 Phillip, J. R., 'Taguchi Techniques for Quality Engineering: Loss Function, Orthogonal Experiments. Parameter and Tolerance Design,' McGraw-Hill, pp. 59 - 85, 1996
7 Kim, G D., Back, C. I., Song, C. K. and Ahn, S. H., 'Laser Marking Process for LCD Light Guide Panel,' Journal of the Korean Society of Precision Engineering, Vol. 20, No.1, pp. 79 - 84, 2003   과학기술학회마을
8 Kim, C. Y., 'Trend of Back Light Unit Technology,' Journal of the Korean Information Display Society, Vol. 2, No.1, pp. 45 - 51, 2001
9 Plinski, E. F., Wicowski, J. S. and Abrarnski, K. M., 'Diffractive Scanning Mechanism for Laser Marker,' Optics and Laser Technology, Vol. 32, pp. 33 - 37, 2000   DOI   ScienceOn
10 Kim, G D., Kang, H. J., Ahn, S. H., Song, C. K., Baek, C. I. and Lee, C. S., 'Laser-marking Process for Liquid Crystal Display Light Guide Panel,' Journal of Engineering Manufacture Proceedings of the Institution of Mechanical Engineers Part B, Vol. 219, No.7, pp. 565 - 569, 2005   DOI   ScienceOn