Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
권호 표지
DOI QR코드

DOI QR Code

Optical Design of a Multilayer LED Array Light Source and Illumination Optics for a Large-Screen LC Projection Display System

대화면 액정 화상 투영기용 다층 배열 엘이디 광원 및 조명광학계 설계

  • Kim, Hyun Hee (Department of Nano Science and Technology, Institute of Photonics & Information Technology, Chonbuk National University) ;
  • Han, Dong Jin (Department of Nano Science and Technology, Institute of Photonics & Information Technology, Chonbuk National University) ;
  • Kim, Jin Seung (Department of Nano Science and Technology, Institute of Photonics & Information Technology, Chonbuk National University)
  • 김현희 (전북대학교 대학원 나노과학기술학과, 광전자정보기술연구소) ;
  • 한동진 (전북대학교 대학원 나노과학기술학과, 광전자정보기술연구소) ;
  • 김진승 (전북대학교 대학원 나노과학기술학과, 광전자정보기술연구소)
  • Received : 2015.06.30
  • Accepted : 2015.08.04
  • Published : 2015.08.25
Download PDF
⟨ Previous Next ⟩

Abstract

A double-layer LED array together with an illumination optical system is proposed as a possible light source for LC projection display systems for large screens, up to $8m{\times}6m$ (400 inches diagonal). The heat dissipation problem of the LED array is solved by arranging the LEDs in double layers, and thermal analysis shows its effectiveness. The light from the LEDs in the back layer can be transmitted through the front layer without significant loss by arranging the LEDs in non-overlapping positions in the two layers and inserting suitable microlenses between the two layers and holes in the first layer. Together with the double-layer LEDs, an illumination optical system is designed to illuminate liquid crystal panels with good uniformity and appropriate matching with the projection optics.

$8m{\times}6m$(400인치)의 대형 화면 액정 화상 투영기에 쓸 수 있는 광원부로서 엘이디를 2층으로 촘촘하게 배열한 광원과 그에 수반되는 조명광학계 설계의 개념을 제시하였다. 엘이디를 촘촘히 배열할 때 생기는 방열문제는 엘이디를 2층으로 배열하면 해결됨을 열분석을 통해 보였다. 뒤 층의 엘이디에서 나오는 빛이 앞 층에 가려질 수 있는 문제는 앞뒤로 어긋나게 배열하여 해결했고, 엘이디 배열에서 나온 빛을 투영렌즈에 맞추어 액정판을 고르게 비추는 조명광학계를 함께 설계하였다.

Keywords

References

  1. S. Nakamura, M. Senoh, and T. Mukai, "P-GaN/N-InGaN/N-GaN double-heterostructure blue-light-emitting diodes," Jpn. J. Appl. Phys. 32, L8-11 (1993). https://doi.org/10.1143/JJAP.32.L8
  2. H. S. You, "LED white light : The domestic market in B2C transition," KISTI MARKET REPORT 1, 8-11 (2011).
  3. E. F. Schubert, Light-Emitting Diodes (Cambridge University Press, Cambridge, UK, 2006), Chapter 5-6.
  4. H. D. Yim, B. M. Choi, D. J. Lee, S. G. Lee, S. G. Park, and B. H. O, "Heat conduction analysis of metal hybrid die adhesive structure for high power LED package," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 24, 342-346 (2013). https://doi.org/10.3807/KJOP.2013.24.6.342
  5. K. Y. Lee, Y. S. Choi, D. S. Jeon, S. C. Kim, and K. E. Son, "Performance evaluation of heat sink for cooling of LED projector," International Journal of Air-Conditioning and Refrigeration 192, 1167-1171 (2008).
  6. M. S. Brennesholtz and E. H. Stupp, Projection Displays (John Wiley & Sons, Chichester, UK, 2008), Chapter 1-2, 11-12.
  7. W. S. Sun, Y. C. Chiang, and C. H. Tsuei, "Optical design for the DLP pocket projector using LED light source," Physics Procedia 19, 301-307 (2011). https://doi.org/10.1016/j.phpro.2011.06.165
  8. S. G. Gang and S. C. Park, "Optical system design for DLP projector using high-power LED," in Proc. OSK Annual Meeting (Hongik Univ., Korea, Feb. 2008), pp. 139-140.
  9. S. C. Shin, Y. S. Jung, T. J. Ahn, S. S. Jeong, S. G. Lee, and K. Y. Choi, "The compact systems design based on DMD and the straight line 2-channel LED for a mobile embedded Pico projector," J. Display Technology 8, 219-224 (2012). https://doi.org/10.1109/JDT.2011.2165934
  10. "Type of Projector" (wireless114, 2006), http://m.blog.daum.net/wireless114/5895500#
  11. Winco K. C. Yung, "Using Metal Core Printed Circuit Board (MCPCB) as a solution for thermal management," J. HKPCA 24, 12-16 (2007).
  12. H. J. Kang, Introduction to the Projector Design Utilizing the LightTools (Modern Hightech Co., Seoul, Korea, 2015).