OSA's Digital Library

Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 26972–26982

A slim apparatus of transferring discrete LEDs’ light into an ultra-collimated planar light source

Tun-Chien Teng, Wen-Shing Sun, Li-Wei Tseng, and Wei-Chung Chang  »View Author Affiliations

Optics Express, Vol. 21, Issue 22, pp. 26972-26982 (2013)

View Full Text Article

Enhanced HTML    Acrobat PDF (1956 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



In this paper, we proposed a novel apparatus, which has very slim volume and can transfer light emitted from discrete LEDs into a uniform and ultra-collimated planar light source (UCPLS). This apparatus adopts the two-layer folded frame and two-stage CPC design so that thickness of the entire apparatus can be minimized; especially the feeder in the two-stage CPC design can greatly reduce the thickness of the CPC and make the light passing through the second-stage CPC become much more collimated. In addition, by side-by-side arrangement, a large-sized UCPLS can also be obtained. In our embodiment with an emitting area of the upper LGP of 280 mmX80 mm and a LED with optical flux of 8 lumens used as the light source, the performance according to the related simulation results shows as follows: angular FWHM of the resultant light emitted from the apparatus in the vertical and horizontal is 4.87 degrees and 24 degrees, respectively; spatial uniformity and total energy efficiency reach 84% and 69%, respectively; the average head-on luminance reaches up 5600 nit, yet this apparatus consumes just 60 mW. Furthermore, the results also demonstrate this design has potential to be applied to the product of 23 inches above while thickness of the entire apparatus is only 2.2 mm.

© 2013 Optical Society of America

OCIS Codes
(220.4000) Optical design and fabrication : Microstructure fabrication
(230.3670) Optical devices : Light-emitting diodes
(220.2945) Optical design and fabrication : Illumination design
(080.4298) Geometric optics : Nonimaging optics

ToC Category:
Optical Design and Fabrication

Original Manuscript: September 17, 2013
Revised Manuscript: October 19, 2013
Manuscript Accepted: October 22, 2013
Published: October 31, 2013

Tun-Chien Teng, Wen-Shing Sun, Li-Wei Tseng, and Wei-Chung Chang, "A slim apparatus of transferring discrete LEDs’ light into an ultra-collimated planar light source," Opt. Express 21, 26972-26982 (2013)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. H. Mukawa, K. Akutsu, I. Matsumura, S. Nakano, T. Yoshida, M. Kuwahara, K. Aiki, and M. Ogawa, “A full color eyewear display using holographic planar waveguides,” SID Symp. Dig. Tech. Pap.39, 89–92 (2008).
  2. A. Cameron, “Optical waveguide technology and its application in head mounted displays,” Proc. SPIE8383, 83830E (2012). [CrossRef]
  3. T. Levola, “Color distribution in exit pupil expanders,” US patent 8254031 (2012).
  4. A. Travis, N. MacCrann, N. Emerton, J. Kollin, A. Georgiou, J. Lanier, and S. Bathiche, “Virtual image display as a backlight for 3D,” Opt. Express21(15), 17730–17735 (2013). [CrossRef] [PubMed]
  5. K. W. Chien, H. P. D. Shieh, and H. Cornelissen, “Polarized backlight based on selective total internal reflection at microgrooves,” Appl. Opt.43(24), 4672–4676 (2004). [CrossRef] [PubMed]
  6. M. Xu, H. P. Urbach, and D. K. G. de Boer, “Simulations of birefringent gratings as polarizing color separator in backlight for flat-panel displays,” Opt. Express15(9), 5789–5800 (2007). [CrossRef] [PubMed]
  7. Y. C. Kim, H. D. Im, M. G. Lee, and H. Y. Choi, “Directivity enhanced BLU for edge-type local dimming,” SID Symp. Dig. Tech. Pap.42, 662–664 (2011).
  8. P. C. Chen, H. H. Lin, C. H. Chen, C. H. Lee, and M. H. Lu, “Color separation system with angularly positioned light source module for pixelized backlighting,” Opt. Express18(2), 645–655 (2010). [CrossRef] [PubMed]
  9. K. Nakamura, T. Fuchida, K. Yamagata, A. Nishimura, T. Takita, and H. Takemoto, “Optical design of front diffuser for collimated backlight and front diffusing system,” IDW11, 475–478 (2011).
  10. K. W. Chien and H. P. D. Shieh, “Time-multiplexed three-dimensional displays based on directional backlights with fast-switching liquid-crystal displays,” Appl. Opt.45(13), 3106–3110 (2006). [CrossRef] [PubMed]
  11. LGD, “Stereoscopic display device using electrically-driven liquid crystal lens,” US patent 7855756 (2010).
  12. L. Pyayt, G. K. Starkweather, and M. J. Sinclair, “One telescope per pixel,” OSA CLEO (2010).
  13. W. Mphepö, Y. P. Huang, P. Rudquist, and H. P. D. Shieh, “Digital micro hinge (DMH) based display pixels,” J. Disp. Technol.6(4), 142–149 (2010). [CrossRef]
  14. H. C. Cheng, J. Yan, T. Ishinabe, N. Sugiura, C. Y. Liu, T. H. Huang, C. Y. Tsai, C. H. Lin, and S. T. Wu, “Blue-phase liquid crystal displays with vertical field switching,” J. Disp. Technol.8(2), 98–103 (2012). [CrossRef]
  15. 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.32(18), 2665–2667 (2007). [CrossRef] [PubMed]
  16. S. Aoyama, A. Funamoto, and K. Imanaka, “Hybrid normal-reverse prism coupler for light-emitting diode backlight systems,” Appl. Opt.45(28), 7273–7278 (2006). [CrossRef] [PubMed]
  17. S. R. Park, O. J. Kwon, D. Shin, S. H. Song, H. S. Lee, and H. Y. Choi, “Grating micro-dot patterned light guide plates for LED backlights,” Opt. Express15(6), 2888–2899 (2007). [CrossRef] [PubMed]
  18. Nanogate Advanced Materials, “Illuminating device,” US patent 7682062 (2010).
  19. W. H. Yang, H. H. Lin, C. J. Hsu, and Y. N. Pao, “LED coupler lens array for one dimensional collimating backlight,” IDW11, 1399–1400 (2011).
  20. D. Grabovičkić, P. Benítez, J. C. Miñano, and J. Chaves, “LED backlight designs with the flow-line method,” Opt. Express20(S1), A62–A68 (2012). [CrossRef] [PubMed]
  21. A. Travis, T. Large, N. Emerton, and S. Bathiche, “Collimated light from a waveguide for a display backlight,” Opt. Express17(22), 19714–19719 (2009). [CrossRef] [PubMed]
  22. I. B. M. Corporation, “Light guide apparatus, a backlight apparatus and a liquid crystal display apparatus,” US patent 6667782Bl (2003).
  23. J. W. Pan and C. W. Fan, “High luminance hybrid light guide plate for backlight module application,” Opt. Express19(21), 20079–20087 (2011). [CrossRef] [PubMed]
  24. J. Chaves, W. Falicoff, O. Dross, J. C. Miñano, P. Benitez, and W. A. Parkyn, “Combination of light sources and light distribution using manifold optics,” Proc. SPIE6338, 63380M (2006).

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited