Design of Slim LED Coupler for Collimated Light Source

  • Chun-Hao Sun
  • Tun-Chien Teng

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.

Published
2016-08-01
How to Cite
Sun, C.-H., & Teng, T.-C. (2016). Design of Slim LED Coupler for Collimated Light Source. Proceedings of Engineering and Technology Innovation, 3, 7-9. Retrieved from http://ojs.imeti.org/index.php/PETI/article/view/231
Section
Articles