Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
권호 표지
DOI QR코드

DOI QR Code

Manufacturing of Wedge-type Light Guide Plates for Large Liquid Crystal Displays

대형 LCD용 쐐기형 도광판 제조공정에 대한 연구

  • Kim, Min-Soo (Department of Mechanical Engineering, Graduate School of Kumoh National Institute of Technology) ;
  • Kim, Jangseob (Department of Mechanical Engineering, Graduate School of Kumoh National Institute of Technology) ;
  • Hong, Jun-Ho (Department of Mechanical Engineering, Graduate School of Kumoh National Institute of Technology) ;
  • Shin, Dongwon (Department of Mechanical System Engineering, Kumoh National Institute of Technology)
  • 김민수 (금오공과대학교 기계공학과 대학원) ;
  • 김장섭 (금오공과대학교 기계공학과 대학원) ;
  • 홍준호 (금오공과대학교 기계공학과 대학원) ;
  • 신동원 (금오공과대학교 기계시스템공학과)
  • Received : 2020.01.28
  • Accepted : 2020.02.25
  • Published : 2020.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

The light guide plate (LGP) provides a surface light source on the back of the liquid crystal display (LCD), which is not self-emitting; thus, it is an essential component of display units requiring sufficient brightness. To maximize the light-emitting effect of an LGP, enough incident light, from the light source, should enter into its side. However, the current trend in LCD panels is represented by larger and thinner screens and this smaller thickness prevents the accordingly thin LGPs from providing sufficient brightness. This paper proposes a process for manufacturing wedge-type LGPs, which might increase the amount of incident light and, consequently the surface light emission, for applications in large LCDs. The proposed method was validated by building a dedicated manufacturing machine and performing illuminance experiments on the fabricated LGP.

Keywords

References

  1. Park, S. H., Choi, E. S., Ahn, S. Y., Shin, Y. J., "Research Trends in Light Guide Plates for LED Backlight Units," Korean Journal of Optics and Photonics, Vol. 28, No. 6, pp. 314-326, 2017. https://doi.org/10.3807/KJOP.2017.28.6.314
  2. Lee, J. W., Park, M. K., Kim, J. H., "A Study of Brightness and Residual Stresses Depending on Thickness of LCD Light Guide Plate," Journal of the Korean Society for Precision Engineering, Vol. 25, No. 9, pp. 38-44, 2008.
  3. Bae, C. H., Heo, K. C., Jhun, C. G., Rvu, B. J., Koo, K. W., "Design and fabrication of pattern structures of the light guide plate for enhanced brightness of backlight unit," The Transactions of The Korean Institute of Electrical Engineers, Vol. 64, No. 2, pp. 310-314, 2015. https://doi.org/10.5370/KIEE.2015.64.2.310
  4. Gong, T., Choi, G. J., Kwon, J. H., Park, I. S., Lee, S., Woo, D., Gwag, J. S., "Optical Design of Light Guide Plate Material for Slim Liquid Crystal Display," Journal of the Korean institute of surface engineering, Vol. 47, No. 5, pp. 233-238, 2014. https://doi.org/10.5695/JKISE.2014.47.5.233
  5. Lee, J. H., Nahm, K. B., Ko, J. H., Kim, J. H., "Optimization of optical structure of lightguide panel for uniformity improvement of edge-lit backlight," Korean Journal of Optics and Photonics, Vol. 21, No. 2, pp. 61-68, 2010. https://doi.org/10.3807/KJOP.2010.21.2.061
  6. Lee, G. S., Jeong, J. H., Yoon, S. J., Choi, D. H., "An integrated design approach for Light Guide Panel (LGP) of Back Light Unit (BLU) to improve the Optical Performance of Liquid Crystal Display (LCD)," In Proceedings of the KSME Conference. The Korean Society of Mechanical Engineers, pp. 1048-1052, 2008.
  7. Sah, J. Y., Park, J. R., "Analysis on Optical characteristics of LCD Backlight LGP," Transactions of the Korean Society of Mechanical Engineers, Vol. 28, No. 4, pp. 362-369, 2004. https://doi.org/10.3795/KSME-A.2004.28.4.362
  8. Kwon D. H., Jang M. H., "Light Guide of Back Light Unit and its Manufacturing Method," Republic of Korea Patent No. 10-1051291.
  9. Lee M. R., Park J. H., "Method for Manufacturing Wedge Type Light Guide Plate for Back Light and the LGP," Republic of Korea Patent No. 10-1685055.