Design of Slim LED Coupler for Collimated Light Source

Authors

  • Chun-Hao Sun
  • Tun-Chien Teng

Keywords:

collimation, coupler, LED, compound parabolic collector, illumination

Abstract

This study proposed a slim coupler to collimate the light emitted from an LED, which can be used as a collimated light source. The coupler is substantially a 2-D compound parabolic collector (CPC); its bottom surface has longitudinally extending V-groove microstructures thereon. The parabolic side walls reflect the propagating light to converge only in the transverse direction, but the V-groove microstructures reflect the light and make its propagating direction gradually rotates around a central axis of the CPC. Therefore, the angular distribution of the light finally converges after several times of reflection on both side walls and V-groove microstructures. Moreover, the illuminance distribution on the outlet of the V-groove CPC becomes more uniform than a CPC without V-groove microstructures. The effects of V-groove microstructures on both angular and illuminance distributions of the light emerging from the outlet of the CPC is analyzed, and the feasibility of providing a uniform collimated light source is verified by conducting simulation.

References

J. H. Lee, H. S. Lee, B. K. Lee, W. S. Choi, H. Y. Choi, and J. B. Yoon, “Simple liquid crystal display backlight unit comprising only a single-sheet micropatterned polydimethylsiloxane (PDMS) light-guide plate,” Opt. Lett., vol. 32, no. 18, pp. 2665-2667, 2007

S. R. Park, O. J. Kwon, D. Shin, and S. H. Song, “Grating micro-dot patterned light guide plates for LED backlights,” Opt. Express, vol. 15, no. 6, pp. 2888-2899, 2007.

J. W. Pan, C. W. Fan, “High luminance hybrid light guide plate for backlight module application,” Opt. Express, vol. 19, no. 21, pp. 20079-20087, 2011.

W. H. Yang, H. H. Lin, C. J. Hsu, and Y. N. Pao, “LED coupler lens array for one dimensional collimating backlight,” IDW., vol. 11, pp. 1399-1400, 2011.

T. C. Teng and L. W. Tseng, “Slim planar apparatus for converting LED light into collimated polarized light uniformly emitted from its top surface,” Opt. Express, vol. 22, no. S6, pp. A1477-A1490, 2014.

Downloads

Published

2016-08-01

How to Cite

[1]
C.-H. Sun and T.-C. Teng, “Design of Slim LED Coupler for Collimated Light Source”, Proc. eng. technol. innov., vol. 3, pp. 7–9, Aug. 2016.

Issue

Vol. 3 (2016)

Section

Articles

License

Submission of a manuscript implies: that the work described has not been published before that it is not under consideration for publication elsewhere; that if and when the manuscript is accepted for publication. Authors can retain copyright of their article with no restrictions. Also, author can post the final, peer-reviewed manuscript version (postprint) to any repository or website.

 


Since Oct. 01, 2015, PETI will publish new articles with Creative Commons Attribution Non-Commercial License, under The Creative Commons Attribution Non-Commercial 4.0 International (CC BY-NC 4.0) License.
The Creative Commons Attribution Non-Commercial (CC-BY-NC) License permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes