OSA's Digital Library

Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 8 — Mar. 10, 2014
  • pp: 1503–1511

High-efficiency backlight module with two guiding modes

Chang-Yi Li and Jui-Wen Pan  »View Author Affiliations

Applied Optics, Vol. 53, Issue 8, pp. 1503-1511 (2014)

View Full Text Article

Enhanced HTML    Acrobat PDF (1343 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



We propose a design for a high-efficiency backlight module that does not require a brightness enhancement film (BEF). With the high-efficiency backlight module it is possible to achieve almost the same half-luminance angle as a conventional edge-lit backlight module can achieve. The backlight system is comprised of a crisscross light guide plate (LGP) and one diffuser sheet. The crisscross LGP is composed of a LGP and optically patterned film (OPF). The backlight module allows light to be extracted through the direct guiding mode and top guiding mode, respectively. We controlled arrangement of the microstructures to increase the optical efficiency and the uniformity by two modes. Compared to the conventional edge-lit backlight module, there is a two-fold improvement in both the total optical efficiency and on-axis luminance with the high-efficiency backlight module.

© 2014 Optical Society of America

OCIS Codes
(220.4830) Optical design and fabrication : Systems design
(230.3670) Optical devices : Light-emitting diodes
(230.4000) Optical devices : Microstructure fabrication
(350.3950) Other areas of optics : Micro-optics
(150.2945) Machine vision : Illumination design

ToC Category:
Optical Design and Fabrication

Original Manuscript: November 12, 2013
Revised Manuscript: January 23, 2014
Manuscript Accepted: January 28, 2014
Published: March 4, 2014

Chang-Yi Li and Jui-Wen Pan, "High-efficiency backlight module with two guiding modes," Appl. Opt. 53, 1503-1511 (2014)

Sort:  Author  |  Year  |  Journal  |  Reset  


  1. W. Zhang, H. Wang, L. Ji, and C. Liu, “Design and simulation of the LGP structure for LED backlight,” Proc. SPIE 7655, 765537 (2010). [CrossRef]
  2. T. Dekker, T. Bergman, and G. Vissenberg, “From backlight to Luminaire,” SID Int. Symp. Dig. Tech. Pap. 43, 248–251 (2012).
  3. K. Käläntär, S. Matsumoto, and T. Onishi, “Functional light guide plate characterized by optical micro-deflector and micro-reflector for LCD backlight,” IEICE Trans. Electron. E84-C, 1637–1646 (2001).
  4. M. Anandan, “Progress of LED backlights for LCDs,” J. Soc. Inf. Disp. 16, 287–310 (2008). [CrossRef]
  5. S. Kobayashi, S. Mikoshiba, and S. Lim, LCD Backlights (Wiley, 2009).
  6. K. Käläntär, “Modified functional light guide plate for backlighting transmissive LCDs,” J. Soc. Inf. Disp. 11, 641–645 (2003). [CrossRef]
  7. J. H. Lee, J. B. Yoon, J. Y. Choi, and J. B. Yoon, “A novel LCD backlight unit using a light guide plate with high fill-factor microlens array and a conical microlens array sheet,” SID Int. Symp. Dig. Tech. Pap. 38, 465–468 (2007).
  8. O. Dross, W. A. Parkyn, J. Chaves, W. Falicoff, J. C. Miñano, P. Benitez, and R. Alvarez, “A superior architecture of brightness enhancement for display backlighting,” Proc. SPIE 6338, 63380G (2006). [CrossRef]
  9. J. C. Miñano, P. Benitez, J. Chaves, M. Hernandez, O. Dross, and A. Santamaria, “High-efficiency LED backlight optics designed with the flow-line method,” Proc. SPIE 5942, 594202 (2005). [CrossRef]
  10. D. Grabovičkić, P. Benítez, J. C. Miñano, and J. Chaves, “LED backlight designs with the flow-line method,” Opt. Express 20, A62–A68 (2012). [CrossRef]
  11. K. Fujisawa, I. Onishi, and Y. Fujiwara, “Edge-light backlight unit using optically patterned film,” Jpn. J. Appl. Phys. 46, 194–199 (2007). [CrossRef]
  12. A. Nagasawa and K. Fujisawa, “An ultra-slim backlight system using optical- patterned film,” SID Int. Symp. Dig. Tech. Pap. 36, 570–573 (2005). [CrossRef]
  13. American National Standards Institute (ANSI) IT7.215-1992, http://www.ansi.org .
  14. Chi Mei Optoelectronics Corp., http://www.datasheet.in/datasheet-html/N/1/0/N101L6-L0B_CMIMEI.pdf.html .
  15. 3M-Vikuiti™ ESR Film, http://www.pronatindustries.com/eng/catalogue.php?instance_id=2&actions=list&id=556 .
  16. KEIWA Inc., http://www.keiwa.co.jp/e/product/pdf_Folder/Opalus_E_200904.pdf .
  17. TSUJIDEN CO. LTD., http://www.tsujiden.co.jp/eng/product/product_info_diffusion.html .
  18. J. W. Pan and C. W. Fan, “High luminance hybrid light guide plate for backlight module application,” Opt. Express 19, 20079–20087 (2011). [CrossRef]
  19. D. Feng, Y. Yan, X. Yang, G. Jin, and S. Fan, “Novel integrated light guide plates for liquid crystal display backlight,” J. Opt. A 7, 111–117 (2005). [CrossRef]
  20. R. Winston, J. C. Miñano, and P. Benítez, Nonimaging Optics, (Academic, 2004).
  21. A. Nagasawa, T. Eguchi, Y. Sanai, and K. Fujisawa, “Ultra-slim and bendable system with a unified component for liquid crystal display applications,” Opt. Rev. 15, 38–43 (2008). [CrossRef]
  22. P. A. Davies, “Edge-ray principle of nonimaging optics,” J. Opt. Soc. Am. A 11, 1256–1259 (1994). [CrossRef]

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