Transactions on Electrical and Electronic Materials

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
권호 표지
DOI QR코드

DOI QR Code

Optical Simulation of Direct-type Backlight Unit for Medical Application

  • Han, Jeong-Min (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Han, Jin-Woo (Department of Electrical and Electronic Engineering, Yonsei University) ;
  • Seo, Dae-Shik (Department of Electrical and Electronic Engineering, Yonsei University)
  • Published : 2008.02.29
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, it was investigated about optical simulation in direct-type backlight design. 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; 26 mm of the distance of two lamps, 4.5 mm 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

References

  1. K. Fujisawa, I. Onishi, and Y. Fujisawa, "Edge-light backlight unit using optically patterned film", Japan Journal of Applied Physics, Vol. 46, No. 1, p. 194, 2007 https://doi.org/10.1143/JJAP.46.194
  2. K. Fujisawa, I. Onishi, and Y. 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, p. L933, 2007 https://doi.org/10.1143/JJAP.46.L933
  3. K.-W. Chien, H.-P. D. Shieh, and H. J. Cornelissen, "Efficient polarized backlight for transflective liquid crystal display illumination", Japan Journal of Applied Physics, Vol. 44, No. 4A, p. 1818, 2005 https://doi.org/10.1143/JJAP.44.1818
  4. A. Tagaya, S. Ishii, K. Yokoyama, E. Higuchi, and Y. Koike, "The advanced highly scattering optical transmission polymer backlight for liquid crystal displays", Japan Journal of Applied Physics, Vol. 41, p. 2241, 2002 https://doi.org/10.1143/JJAP.41.2241
  5. K. Kakinuma, "Technology of wide color gamut backlight with LED for liquid crystal display television", Japan Journal of Applied Physics, Vol. 45, No. 5B, p. 4330, 2006 https://doi.org/10.1143/JJAP.45.4330
  6. K. Kalantar, S. Matsumoto, T. Mizuno, and T. Katoh, "Backlight unit with double surface light emission using a single micro-structured light-guide plate", SID Digest., Vol. 35, p. 1182, 2004 https://doi.org/10.1889/1.1821333
  7. Y. S. Kim and S. Lim, "Design of high uniformity LED backlight", SID Digest., Vol. 36, p. 1321, 2005
  8. J.-M. Han and D.-S. Seo, "Electric-optical characteristics of back light unit with LED light source in low temperature condition", Trans. EEM, Vol. 8, No. 2, p. 93, 2007 https://doi.org/10.4313/TEEM.2007.8.2.093
  9. 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", Trans. EEM, Vol. 8, No. 4, p. 166, 2007 https://doi.org/10.4313/TEEM.2007.8.4.166
  10. J.-M. Han, C.-H. Ok, and D.-S. Seo, "The effect of color reproduction properties at TFT-LCD using high color reproduction CCFL", Trans. EEM, Vol. 8, No. 5, p. 215, 2007 https://doi.org/10.4313/TEEM.2007.8.5.215
  11. C.-C. Hu, T.-L. Su, W.-M. Pai, and W.-C. Lan, "New concepts of LCD-TV backlight design with variable lamp pitch", SID Digest, Vol. 37, p. 1428, 2006 https://doi.org/10.1889/1.2433254

Cited by

  1. Optical Characteristics of a Flexible Back-Light Unit with Plasma Discharge Clusters vol.12, pp.5, 2011, https://doi.org/10.4313/TEEM.2011.12.5.189