Abstract

We analyze the polarization-preserving property of two conventional edge-lit light guide plates (LGPs) based on scattering dots and refractive microgrooves and find that these two structures almost completely depolarize the incident linearly polarized light. We then propose a new edge-lit LGP based on total internal reflection (TIR). Simulation results show that such a TIR-based LGP can largely preserve the polarization state of the incident linearly polarized light. The polarization efficiency is 77.2%. By incorporating a linearly polarized LED to our proposed LGP, the overall optical gain is 1.54 compared with the backlight system with an unpolarized LED. At on-axis, the luminance is $2.4\times$ higher. Because the output light is concentrated near the surface normal direction, no additional brightness enhancement film is needed. This polarization-preserving LGP enables a polarized or partially polarized LED backlight to be used, which in turn greatly enhances the optical efficiency of a LCD.

© 2013 IEEE

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2013 (2)

Z. Luo, Y. Chen, S. T. Wu, "Wide color gamut LCD with a quantum dot backlight," Opt. Exp. 21, 26269-26284 (2013).

Y. Zhao, Q. Yan, D. Feezell, K. Fujito, C. G. Van de Walle, J. S. Speck, S. P. DenBaars, S. Nakamura, "Optical polarization characteristics of semipolar (30 $\overline{31}$ ) and (30 $\overline{31}$ ) InGaN/GaN light-emitting diodes," Opt. Exp. 21, A53-A59 (2013).

2012 (2)

M. Ma, D. S. Meyaard, Q. F. Shan, J. Cho, E. F. Schubert, G. B. Kim, M. Kim, C. Sone, "Polarized light emission from GaInN light- emitting diodes embedded with subwavelength aluminum wire-grid polarizers," Appl. Phys. Lett. 101, (2012) Art. ID 061103.

H. J. B. Jagt, H. J. Cornelissen, D. J. Broer, C. W. M. Bastiaansen, "Linearly polarized light-emitting backlight," J. Soc. Inf. Display 10, 107-112 (2012).

2011 (2)

K. L. Lee, K. Y. He, "Effect of micro-structural light guide plate on source of linearly polarized light," J. Lightw. Technol. 29, 3327-3330 (2011).

Y. P. Huang, F. C. Lin, H. P. D. Shieh, "Eco-displays: The color LCD's without color filters and polarizers," J. Display Technol. 7, 630-632 (2011).

2010 (1)

2009 (3)

2008 (1)

2007 (3)

S. Gauza, X. Zhu, W. Piecek, R. Dabrowski, S. T. Wu, "Fast switching liquid crystals for color-sequential LCDs," J. Display Technol. 3, 250-252 (2007).

M. F. Schubert, S. Chhajed, J. K. Kim, E. F. Schubert, J. Cho, "Polarization of light emission by 460 nm GaInN/GaN light-emitting diodes grown on (0001) oriented sapphire substrates," Appl. Phys. Lett. 91, (2007) Art. ID 051117.

M. Xu, H. P. Urbach, D. K. G. de Boer, "Simulations of birefringent gratings as polarizing color separator in backlight for flat-panel displays," Opt. Exp. 15, 5789-5800 (2007).

2005 (1)

2004 (1)

2000 (1)

M. F. Weber, C. A. Stover, L. R. Gilbert, T. J. Nevitt, A. J. Ouderkirk, "Giant birefringent optics in multilayer polymer mirrors," Science 287, 2451-2456 (2000).

Appl. Opt. (2)

Appl. Phys. Lett. (2)

M. F. Schubert, S. Chhajed, J. K. Kim, E. F. Schubert, J. Cho, "Polarization of light emission by 460 nm GaInN/GaN light-emitting diodes grown on (0001) oriented sapphire substrates," Appl. Phys. Lett. 91, (2007) Art. ID 051117.

M. Ma, D. S. Meyaard, Q. F. Shan, J. Cho, E. F. Schubert, G. B. Kim, M. Kim, C. Sone, "Polarized light emission from GaInN light- emitting diodes embedded with subwavelength aluminum wire-grid polarizers," Appl. Phys. Lett. 101, (2012) Art. ID 061103.

J. Display Technol. (1)

Y. P. Huang, F. C. Lin, H. P. D. Shieh, "Eco-displays: The color LCD's without color filters and polarizers," J. Display Technol. 7, 630-632 (2011).

J. Display Technol. (5)

J. Lightw. Technol. (1)

K. L. Lee, K. Y. He, "Effect of micro-structural light guide plate on source of linearly polarized light," J. Lightw. Technol. 29, 3327-3330 (2011).

J. Soc. Inf. Display (2)

H. J. B. Jagt, H. J. Cornelissen, D. J. Broer, C. W. M. Bastiaansen, "Linearly polarized light-emitting backlight," J. Soc. Inf. Display 10, 107-112 (2012).

Y. Li, T. X. Wu, S. T. Wu, "A broadband wide-incident-angle reflective polarization converter," J. Soc. Inf. Display 17, 849-852 (2009).

Opt. Exp. (1)

Y. Zhao, Q. Yan, D. Feezell, K. Fujito, C. G. Van de Walle, J. S. Speck, S. P. DenBaars, S. Nakamura, "Optical polarization characteristics of semipolar (30 $\overline{31}$ ) and (30 $\overline{31}$ ) InGaN/GaN light-emitting diodes," Opt. Exp. 21, A53-A59 (2013).

Opt. Exp. (2)

Z. Luo, Y. Chen, S. T. Wu, "Wide color gamut LCD with a quantum dot backlight," Opt. Exp. 21, 26269-26284 (2013).

M. Xu, H. P. Urbach, D. K. G. de Boer, "Simulations of birefringent gratings as polarizing color separator in backlight for flat-panel displays," Opt. Exp. 15, 5789-5800 (2007).

Science (1)

M. F. Weber, C. A. Stover, L. R. Gilbert, T. J. Nevitt, A. J. Ouderkirk, "Giant birefringent optics in multilayer polymer mirrors," Science 287, 2451-2456 (2000).

Other (4)

S. Kobayashi, S. Mikoshiba, S. Lim, LCD Backlights (Wiley, 2009).

D.-K. Yang, S.-T. Wu, Fundamentals of Liquid Crystal Devices (Wiley, 2006).

H. Hasebe, S. Kobayashi, "A full-color field sequential LCD using modulated backlight," SID Symp. Dig. Tech. Papers (1985) pp. 81-83.

Optical Research Associates (ORA) http://www.opticalres.com.

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