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Optical Design for High Brightness Direct Type Backlight Unit Using Medical LCD Application  

Han, Jeong-Min (서일대학교 전기과)
Kim, Won-Bae (송원대학교 전기전자공학과)
Publication Information
Journal of Satellite, Information and Communications / v.11, no.3, 2016 , pp. 28-31 More about this Journal
Abstract
In this study, it was investigated about optical simulation in highg brightness and high uniformity direct-type backlight design for medical application. Direct-type backlight has been used high-brightness backlight such as Medical LCD application. The key parameter in designing direct-type backlight was consists of three geometrical dimension such as the distance of two lamps, the gap of lamp and reflection plate and the number of lamps. It has many of variations in optical design and it causes the different properties in backlight system. It shows the best values of above parameters; 26mm of the distance of two lamps, 4.5mm of the gap of lamp and reflection plate and 16 lamps. And we produced the specimen as above condition, and acquired good result in backlight such as the value of the brightness is 6423 nit in center of emission area and less than 5% in brightness uniformity. It shows the effective ways of designing backlight system using optical simulation method for medical LCD application.
Keywords
Medical LCD; High brightness LCD; Direct type LCD; Optical distance; Lamp array ptich;
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Times Cited By KSCI : 3  (Citation Analysis)
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1 Katsuya Fujisawa, Ikuo Onishi and Yasufumi Fujisawa, "Edge-light backlight unit using optically patterned film", Japan Journal of Applied Physics Vol. 46, No. 1, pp. 194-199 (2007).   DOI
2 Katsuya Fujisawa, Ikuo Onishi and Yasufumi Fujiwara, "Edge-light backlight unit using optically patterned film with plural LED placed on side as light source", Japan Journal of Applied Physics Vol. 46, No. 38, pp. L933-L935 (2007).   DOI
3 Ko-Wei Chien, Han-Ping D. Shieh and Hugo J. Cornelissen "Efficient polarized backlight for transflective liquid crystal display illumination", Japan Journal of Applied Physics Vol. 44, No. 4A, pp. 1818-1819 (2005).   DOI
4 Akihiro Tagaya, Suguru Ishii, Kazuaki Yokoyama, Eizaburo Higuchi and Yasuhiro Koike, "The advanced highly scattering optical transmission polymer backlight for liquid crystal displays", Japan Journal of Applied Physics Vol. 41, pp. 2241-2248 (2002).   DOI
5 Koichiro Kakinuma, "Technology of wide color gamut backlight with LED for liquid crystal display television", Japan Journal of Applied Physics Vol. 45, No. 5B, pp. 4330-4334 (2006).   DOI
6 J.-M. Han, and D.-S. Seo, "Electric-optical characteristics of back light unit with LED light source in low temperature condition", Transactions on Electrical and Electronic Materials, Vol. 8, No. 2, pp. 93-96 (2007)   DOI
7 J.-M. Han, C.-H. Ok, J.-Y. Hwang, and D.-S. Seo, "Characteristics of motion-blur free TFT-LCD using short persistent CCFL in blinking backlight driving", Transactions on Electrical and Electronic Materials, Vol. 8, No. 4, pp. 166-169 (2007)   DOI
8 J.-M. Han, C.-H. Ok, and D.-S. Seo, "The effect of color reproduction properties at TFT-LCD using high color reproduction CCFL", Transactions on Electrical and Electronic Materials, Vol. 8, No. 5, pp. 215-217 (2007)   DOI
9 C.-C. Hu, T.-L. Su, W.-M. Pai, W.-C. Lan, "New concepts of LCD-TV backlight design with variable lamp pitch", SID Digest, Vol. 37, pp. 1428-1430 (2006)   DOI