Abstract

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

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References

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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
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    [CrossRef]
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  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]
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    [CrossRef]
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    [CrossRef]
  13. http://www.lumileds.com/pdfs/Luxeon_light_source_ solutions.PDF
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  16. http://catalog.osram-os.com/catalogue/
  17. Zemax, Zemax Development Corp
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  19. R. Winston, J. C. Minano, and P. Benitez, "Nonimaging Optics," Elsevier Academic Press, 2005
  20. LightTools, Optical Research Associates

2007

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]

2006

Li Feng-li, Chen Zhe, Ye Qin, and Tang Zhen-fang, "LCD backlight light-guide plate design," Proc. SPIE, vol. 6149, 614939, 2006
[CrossRef]

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]

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]

Chao Heng Chien and Zhi Peng Chen, "Fabrication of integrated light guiding plate for backlight system," Proc. 6109, 610909, 2006
[CrossRef]

T. J. Smith, "Side-emitting collimator," US Patent, No. 7,083,313 B2, 2006

2005

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

R. Winston, J. C. Minano, and P. Benitez, "Nonimaging Optics," Elsevier Academic Press, 2005

W. J. Cassaly and B. Irving, "Noise Tolerant Illumination Optimization Applied to Display Devices," Proc. SPIE, vol. 5638, pp. 67-80, 2005
[CrossRef]

M. Bennahmias and T. Jannson, "Ray tracing analysis of display illumination systems," Proc. 5638, pp. 105- 112
[CrossRef]

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]

J. C. Minano, etc, "High-efficiency LED backlight optics designed with the flow-line method," Proc. SPIE, vol. 5942, 594202, 2005
[CrossRef]

2004

Jorg-Erich Sorg, "LED light source with lens," US Patent, US 2004/0232825 A1, 2004

2003

T. Marshall and M. Pashley, "LED Collimation optics with improved performance and reduced size," US Patent, no. 6547423 B2, 2003

1998

Vladimir Medvedev, D. Pelka, and B. Parkyn, "Uniform LED illuminator for miniature displays," Proc. SPIE, vol. 3428, pp. 142-153, 1998
[CrossRef]

Journal of the Optical Society of Korea

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]

Proc. SPIE

J. C. Minano, etc, "High-efficiency LED backlight optics designed with the flow-line method," Proc. SPIE, vol. 5942, 594202, 2005
[CrossRef]

Li Feng-li, Chen Zhe, Ye Qin, and Tang Zhen-fang, "LCD backlight light-guide plate design," Proc. SPIE, vol. 6149, 614939, 2006
[CrossRef]

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]

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]

Vladimir Medvedev, D. Pelka, and B. Parkyn, "Uniform LED illuminator for miniature displays," Proc. SPIE, vol. 3428, pp. 142-153, 1998
[CrossRef]

Chao Heng Chien and Zhi Peng Chen, "Fabrication of integrated light guiding plate for backlight system," Proc. 6109, 610909, 2006
[CrossRef]

Proceedings of the SPIE

W. J. Cassaly and B. Irving, "Noise Tolerant Illumination Optimization Applied to Display Devices," Proc. SPIE, vol. 5638, pp. 67-80, 2005
[CrossRef]

M. Bennahmias and T. Jannson, "Ray tracing analysis of display illumination systems," Proc. 5638, pp. 105- 112
[CrossRef]

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]

SID 05 Digest

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

Other

http://catalog.osram-os.com/catalogue/

Zemax, Zemax Development Corp

T. Marshall and M. Pashley, "LED Collimation optics with improved performance and reduced size," US Patent, no. 6547423 B2, 2003

R. Winston, J. C. Minano, and P. Benitez, "Nonimaging Optics," Elsevier Academic Press, 2005

LightTools, Optical Research Associates

http://www.lumileds.com/pdfs/Luxeon_light_source_ solutions.PDF

T. J. Smith, "Side-emitting collimator," US Patent, No. 7,083,313 B2, 2006

Jorg-Erich Sorg, "LED light source with lens," US Patent, US 2004/0232825 A1, 2004

OSRAM, "LED Display Backlighting - Monitor Applications using 6-lead MULTILED: Application note," http://catalog.osram-os.com/media/_en/Graphics/ 00026781_0.pdf

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