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Journal of the Optical Society of Korea

Journal of the Optical Society of Korea


  • Vol. 11, Iss. 3 — Sep. 25, 2007
  • pp: 113–117

LED Light Coupler Design for a Ultra Thin Light Guide

J.H. Lee, W. Chang, and D. Choi  »View Author Affiliations

Journal of the Optical Society of Korea, Vol. 11, Issue 3, pp. 113-117 (2007)

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A LED light coupler is proposed for coupling light from a mini side LED of 0.4 mm height to a very thin (<TEX>${\sim}0.3 mm$</TEX>) light guide. Due to the ultra thinness of the light guide, conventional light couplings between LEDs and light guides do not provide adequate coupling efficiency. The designed LED coupler is a compound lens of 3.5 mm length, 1.2 mm height, and 3.3 mm width. The courier first collimates the light from the LED and then concentrates the light in a manner similar to a compound parabolic concentrate, (CPC) into the light guide. The exit surface of the coupler is additionally textured to have micro patterns in order to control the radiance profile.

© 2007 Optical Society of Korea

OCIS Codes
(080.3620) Geometric optics : Lens system design
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(150.2950) Machine vision : Illumination

Original Manuscript: August 27, 2007
Revised Manuscript: September 13, 2007
Published: September 25, 2007

J.H. Lee, W. Chang, and D. Choi, "LED Light Coupler Design for a Ultra Thin Light Guide," J. Opt. Soc. Korea 11, 113-117 (2007)

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  1. OSRAM, "LED Display Backlighting - Monitor Applications using 6-lead MULTILED: Application note," http://catalog.osram-os.com/media/_en/Graphics/ 00026781_0.pdf
  2. Vladimir Medvedev, D. Pelka, and B. Parkyn, "Uniform LED illuminator for miniature displays," Proc. SPIE, vol. 3428, pp. 142-153, 1998 [CrossRef]
  3. Jorg-Erich Sorg, "LED light source with lens," US Patent, US 2004/0232825 A1, 2004
  4. I. Kim and K. Chung, "Wide Color Gamut Backlight from Three-band White LED," Journal of the Optical Society Korea, vol. 11, no. 2, pp. 67-70, 2007 [CrossRef]
  5. J. C. Minano, etc, "High-efficiency LED backlight optics designed with the flow-line method," Proc. SPIE, vol. 5942, 594202, 2005 [CrossRef]
  6. Li Feng-li, Chen Zhe, Ye Qin, and Tang Zhen-fang, "LCD backlight light-guide plate design," Proc. SPIE, vol. 6149, 614939, 2006 [CrossRef]
  7. Jee-Gong Chang, Yu-Bin Fang, and Chi-Feng Lin, "Solution strategy of optimal dot pattern design for light guide using in backlight," Proc. SPIE, vol. 6034, 60340T, 2006 [CrossRef]
  8. Ping Xu, Zelin Yan, Lili Wan, and Haixuan Huang, "Designing new integrated LGP of backlight system using binary optical technique," Proc. SPIE, vol. 5636, pp. 66-72, 2005 [CrossRef]
  9. Di Feng, Xingpen Yang, Guofan Jin, Yingbai Yan, and Shoushan Fan, "Integrated light-guide plates that can control the illumination angle for liquid crystal display backlight system," Proc. SPIE, vol. 6034, 603406, 2006 [CrossRef]
  10. W. J. Cassaly and B. Irving, "Noise Tolerant Illumination Optimization Applied to Display Devices," Proc. SPIE, vol. 5638, pp. 67-80, 2005 [CrossRef]
  11. M. Bennahmias and T. Jannson, "Ray tracing analysis of display illumination systems," Proc. 5638, pp. 105- 112 [CrossRef]
  12. Chao Heng Chien and Zhi Peng Chen, "Fabrication of integrated light guiding plate for backlight system," Proc. 6109, 610909, 2006 [CrossRef]
  13. http://www.lumileds.com/pdfs/Luxeon_light_source_ solutions.PDF
  14. T. J. Smith, "Side-emitting collimator," US Patent, No. 7,083,313 B2, 2006
  15. A. Nagawawa and K. Fujisawa, "P-175L: Late-News Poster: An Ultra Slim Backlight System using Optical- Patterned Film," SID 05 Digest, pp. 570-573, 2005
  16. http://catalog.osram-os.com/catalogue/
  17. Zemax, Zemax Development Corp
  18. T. Marshall and M. Pashley, "LED Collimation optics with improved performance and reduced size," US Patent, no. 6547423 B2, 2003
  19. R. Winston, J. C. Minano, and P. Benitez, "Nonimaging Optics," Elsevier Academic Press, 2005
  20. LightTools, Optical Research Associates

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