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http://dx.doi.org/10.3807/KJOP.2020.31.4.176

Feasibility Study of the Light-outcoupling Characteristics of a Diffraction-grating-imprinted Light-guide Plate for an LCD Backlight Unit  

Choi, Hwan Young (Department of Mechanical Design Engineering, Korea University of Technology and Education)
Publication Information
Korean Journal of Optics and Photonics / v.31, no.4, 2020 , pp. 176-182 More about this Journal
Abstract
The possibility of replacing the condensing-prism film used in conventional backlight units with a light-guide plate engraved with a submicrometer-periodic diffraction grating was investigated. The optimal period for the diffraction grating was determined through simulation and experiment, and the transmission-mode efficiency of the diffraction grating was calculated in terms of the polar angle and azimuthal angle of the incident light. In addition, the effects of the two methods of optimizing the polar angle and the directional angle were compared by simulation, by suggesting the shape and configuration of the light-guide plate, so that more light could be extracted by diffraction. By using a ray-tracing program, the luminance angular distribution of the light-guide plate engraved with the diffraction grating was calculated and compared to the luminance angular distribution for each actual prototype.
Keywords
Light-guide plate; Diffraction efficiency; Light extraction;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 M.-G. Lee, H.-Y. Choi, J.-S. Choi, and J.-H. Min, "Backlight using planar hologram for flat display device," U.S. Patent 7253799B2 (2007).
2 M. Parikka, T. Kaikuranta, P. Laakkonen, J. Lautanen, J. Tervo, M. Honkanen, M. Kuittinen, and J. Turunen, "Deterministic diffractive diffusers for displays," Appl. Opt. 40, 2239-2246 (2001).   DOI
3 J. H. Min, H. Y. Choi, M. G. Lee, J. S. Choi, J. H. Kim, and S. M. Lee, "Holographic backlight unit for mobile LCD devices," J. Soc. Inf. Disp. 11, 653-657 (2003).   DOI
4 A. K. Aristov, V. V. Novoselskii, G. B. Semenov, T. V. Shchedrunova, H.-K. Sohn, and M.-B. Yu, "Holographic diffraction grating for side lighting of liquid-crystal displays," J. Opt. Technol. 70, 480-484 (2003).   DOI
5 H. Y. Choi and Y. P. Park, "Design and analysis of diffractive grating imprinted light-guide plate for LCD illumination," J. Inf. Disp. 5, 7-15 (2004).
6 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. Express 15, 2888-2899 (2007).   DOI
7 Y. Ye, D. Pu, Y. Zhou, and L. Chen, "Diffraction characteristics of a sub-micrometer grating for a light guide plate," Appl. Opt. 46, 3396-3399 (2007).   DOI
8 J. Kimmel, "Review Paper: Diffractive backlight technologies for mobile applications," J. Soc. Inf. Disp. 20, 245-258 (2012).   DOI
9 P. Lalanne and G. M. Morris, "Highly improved convergence of the coupled-wave method for TM polarization," J. Opt. Soc. Am. A 13, 779-784 (1996).   DOI
10 S. Peng and G. M. Morris, "Efficient implementation of rigorous coupled-wave analysis for surface-relief gratings," J. Opt. Soc. Am. A 12, 1087-1096 (1995).   DOI
11 S. H. Park, E. S. Choi, S. Y. Ahn, and Y. J. Shin, "Research trends in light guide plates for LED backlight units," Korean J. Opt. Photon. 28, 314-326 (2017).   DOI
12 K. Kalantar, "Modified functional light-guide plate for backlighting transmissive LCDs," J. Soc. Inf. Disp. 11, 641-645 (2003).   DOI
13 S. Aoyama, A. Funamoto, and K. Imanaka, "Hybrid normal-reverse prism coupler for light-emitting diode backlight systems," Appl. Opt. 45, 7273-7278 (2006).   DOI
14 J.-W. Pan and C.-W. Fan, "High luminance hybrid light guide plate for backlight module application," Opt. Express 19, 20079-20087 (2011).   DOI
15 C.-Y. Li and J.-W. Pan, "High-efficiency backlight module with two guiding modes," Appl. Opt. 53, 1503-1511 (2014).   DOI
16 R. Zhang, "Directional backlighting system using a light guide with paired microstructures," Appl. Opt. 56, 6735-6741 (2017).   DOI
17 S. Ochiai, "Light guide plates and light guide plate assembly utilizing diffractive grating," U.S. Patent 5703667A (1997).