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http://dx.doi.org/10.3807/KJOP.2011.22.6.247

Study on the Optimization of the Optical Structure of Lenticular-Lens Films for LCD Backlight Applications  

Seo, Jae-Seok (Department of Physics, Hallym University)
Ko, Jae-Hyeon (Department of Physics, Hallym University)
Publication Information
Korean Journal of Optics and Photonics / v.22, no.6, 2011 , pp. 247-255 More about this Journal
Abstract
The optical performance of LLF(Lenticular Lens Film)-based backlight was studied by using optical simulation as functions of the aspect ratio and the refractive index of lenticular lenses. In order to perform reliable simulation, the BSDF(bi-directional scattering distribution function) of the scattering dots on the bottom surface of the light guide plate was obtained as a superposition of the Lambertian and the elliptic Gaussian distribution components by comparing the experimental results and the simulation for the luminance distribution on the light guide. Based on this approach, an appropriate BSDF of the scattering dots of the light guide was constructed. The resultant values of the optimized aspect ratio and the refractive were found to be 1.25 and 1.65, respectively. In spite of the hybrid aspects of LLF incorporating both diffusing and collimating functions, the optical performance, in particular the on-axis luminance of LLF-based backlight was inferior by about 20% compared to that of conventional backlights adopting one prism film. However, the combination of two lenticular lens films resulted in comparable luminance gain as well as smooth decrease in the luminance with the viewing angle without exhibiting any side lobes.
Keywords
Backlight; Lenticular lens film; Ray tracing technique;
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Times Cited By KSCI : 12  (Citation Analysis)
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1 S.-W. Oh, N. Kim, E.-S. Kim, and J.-W. An, "Optimization of the dual-layer LGP for improving luminance and uniformity of edge type back light unit," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 21, 247-253 (2010).   과학기술학회마을   DOI
2 J. H. Lee, Y. H. Ju, J.-H. Park, J.-Y. Lee, K.-B. Nahm, J.-H. Ko, and J. H. Kim, "Optical simulation study on the effect of reflecting properties of reflection films on the performances of collimating films for the LCD backlight applications," J. Inform. Display 9, 26-32 (2008).   과학기술학회마을   DOI
3 J. H. Lee, K.-B. Nahm, J.-H. Ko, and J. H. Kim, "Optimization of optical structure of lightguide panel for uniformity improvement of edge-lit backlight," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 21, 61-68 (2010).   과학기술학회마을   DOI
4 Y.-M. Lee, J. H. Lee, and E. C. Jeon, "A study on an integrated light guide plate," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 21, 53-60 (2010).   과학기술학회마을   DOI
5 S. S. Lee, H. J. Ma, Y. Shin, and E. S. Choi, "Simulation study of uniformity enhancement caused by changing the slope of a slanted plate," Sae Mulli: New Physics 61, 763-767 (2011).   DOI
6 S. S. Jeong, Y. W. Jeong, M. W. Park, S. J. Kim, J. H. Kim, and J.-H. Ko, "Indirect estimation of the reflection distribution function of the scattering dot patterns on a light guide plate for edge-lit LED backlight applications," J. Inform. Display 12, 167-171 (2011).   DOI
7 J. S. Seo and J.-H. Ko, "Experimental and simulation study on the optical performances of lenticular-lens optical films for LCD backlights," in Proc. IDW'11 Tech. Digest (Nagoya, Japan, Dec. 2011), in press.
8 G. Park, T. S. Aum, J. H. Kwon, J. H. Park, B. K. Kim, and J. K. Shin, "Characterization and modeling light scattering in diffuser sheets," J. Korean Phys. Soc. 54, 44-48 (2009).   과학기술학회마을   DOI
9 J.-H. Park, J. H. Lee, J. H. Jeong, K.-B. Nahm, and J.-H. Ko, "Optical simulation study on the performances of collimating films for LCD backlight applications," Hankook Kwanghak Hoeji (Korean J. Opt. Photon.) 18, 432-440 (2007).   과학기술학회마을   DOI
10 P. Semenza, "Getting the light through: TFT-LCD optical films," Information Display 27, 8-12 (2011).
11 C.-K. Park, H.-S. Lee, and S.-S. Lee, "Dual backlight unit incorporating a single light source integrated with a beam splitting reflector," Hankook Kwanghak Hoeji (Korean J. Opt. Photon.) 19, 122-126 (2008).   과학기술학회마을   DOI
12 Y. H. Ju, J.-H. Park, J. H. Lee, J.-Y. Lee, K.-B. Nahm, J.-H. Ko, and J. H. Kim, "Study on the simulation model for the optimization of optical structures of edge-lit backlight for LCD applications," J. Opt. Soc. Korea 12, 25-30 (2008).   과학기술학회마을   DOI
13 K.-H. Lee, S.-H. Jee, S.-H. Kim, Y.-S. Yoon, and S.-H. Kim, "Modeling for new type backlight units," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 21, 41-45 (2010).   과학기술학회마을   DOI   ScienceOn
14 S.-T. Hu, S.-W. Choi, and M. Lee, "An edge-lit backlight unit for small portable liquid crystal displays with a newly designed single pyramid sheet," J. Korean Phys. Soc. 58, 392-395 (2011).   DOI   ScienceOn
15 J. H. Lee, W. Chang, and D. Choi, "LED light coupler design for a ultra thin light guide," J. Opt. Soc. Korea 11, 113-117 (2007).   과학기술학회마을   DOI
16 G. Park, Y. G. Kim, J. H. Yi, J. H. Kwon, J. H. Park, B. G. Kim, B. C. Ahn, and H. S. Soh, "Color mixing characteristics of LED backlight unit," in Proc. IDW '07 Tech. Digest (Sapporo, Japan, Dec. 2007), pp. 643-646.
17 B. H. Hong, "The structural principle and the technological trend of LCD backlights," Journal of the KIIEE 21, 21-36 (2007).
18 A. Mills, "LED backlights poised to penetrate larger liquid crystal displays," LEDs Magazine May/June, 36-38 (2007).
19 J.-H. Ko, J. S. Ryu, M.-Y. Yu, S.-M. Park, and S. J. Kim, "Initial photometric and spectroscopic characteristics of 55-inch CCFL and LED backlights for LCD-TV applications," Journal of the KIIEE 24, 8-13 (2010).   과학기술학회마을   DOI
20 Y. G. Kim, G. Park, and J. H. Kwon, "Removal of bright spots and color mixing characteristics of side-lit LED backlight," in Proc. OSK Summer Meeting (Phoenixpark Hotel, Korea, Jul. 2008), pp. 443-444.