Journal of the Optical Society of Korea

  • 제18권5호
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  • Pages.538-545
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  • 2014
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  • 1226-4776(pISSN)
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  • 2093-6885(eISSN)
한국광학회 (Optical Society of Korea)
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Simulation Study on the Minimization of Moiré Patterns Caused by Microlens Array Films for Backlight Applications

  • Joo, Byung-Yun (Department of Mechanical Engineering, Korea University of Technology and Education) ;
  • Ko, Jae-Hyeon (Department of Physics, Hallym University)
  • 투고 : 2014.08.08
  • 심사 : 2014.09.23
  • 발행 : 2014.10.25
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초록

Microlens array (MLA) films have been used as brightness-enhancement components in many illumination systems, such as a backlight, which should meet the industrial needs of low cost and high brightness performance. A hexagonally-arranged MLA (HA-MLA) was chosen due to its high filling factor, which was a prerequisite for achieving high brightness-enhancement capability. The moir$\acute{e}$ fringes produced in a film stack composed of two HA-MLA were investigated, under four different lens configurations, by optical simulation. It was found that randomizing the lens configuration, while keeping the filling factor high, was effective way to develop high-gain MLA films for backlight applications.

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참고문헌

  1. M. Tjahjadi, G. Hay, D. J. Coyle, and E. G. Olczak, "Advances in LCD backlight film and plate technology," Information Display 10/06, 22-27 (2006).
  2. G.-J. Park, Y.-G. Kim, J.-H. Yi, J.-H. Kwon, J.-H. Park, S.-H. Kim, B.-K. Kim, J.-K. Shin, and H.-S. Soh, "Enhancement of the optical performance by optimization of optical films in direct-illumination LCD backlight," J. Opt. Soc. Korea 13, 152-157 (2009). https://doi.org/10.3807/JOSK.2009.13.1.152
  3. J. S. Seo, T. E. Yeom, and J.-H. Ko, "Experimental and simulation study of the optical performances of a wide grid polarizer as a luminance enhancement film for LCD backlight applications," J. Opt. Soc. Korea 16, 151-156 (2012). https://doi.org/10.3807/JOSK.2012.16.2.151
  4. H. Ottevaere, R. Cox, H. P. Herzig, T. Miyashita, K. Naessens, M. Taghizadeh, R. Volkel, H. J. Woo, and H. Thienpont, "Comparing glass and plastic refractive microlenses fabricated with different technologies," J. Opt. A: Pure Appl. Opt. 8, S407-S429 (2006). https://doi.org/10.1088/1464-4258/8/7/S18
  5. C. T. Pan and C. H. Su, "Fabrication of gapless triangular micro-lens array," Sens. Actuators A 134, 631-640 (2007). https://doi.org/10.1016/j.sna.2006.05.045
  6. S. K. Hwang, S. H. Baek, J. H. Kwon, and Y. S. Park, "Fabrication of microlens array using photoresist thermal reflow," Korean J. Opt. Photon. (Hankook Kwanghak Hoeji) 20, 118-122 (2009). https://doi.org/10.3807/HKH.2009.20.2.118
  7. K. M. Baker, "Highly corrected close-packed microlens arrays and moth-eye structuring on curved surfaces," Appl. Opt. 38, 352-356 (1999). https://doi.org/10.1364/AO.38.000352
  8. S.-I. Chang, J.-B. Yoon, H. Kim, J.-J. Kim, B.-K. Lee, and D. H. Shin, "Microlens array diffuser for a light-emitting diode backlight system," Opt. Lett. 31, 3016-3018 (2006). https://doi.org/10.1364/OL.31.003016
  9. B.-Y. Joo and D.-H. Shin, "Simulations of pixel moires in the liquid crystal display with image processing technique," Displays 30, 190-194 (2009). https://doi.org/10.1016/j.displa.2009.08.003
  10. S.-J. Byun, S. Y. Byun, J. Lee, W. M. Kim, H.-P. Kim, M. Y. Jeon, and T.-S. Lee, "An efficient simulation and analysis method of moire patterns in display systems," Opt. Express 22, 3128-3136 (2014). https://doi.org/10.1364/OE.22.003128
  11. E. G. Olczak, M. Yamada, D. J. Coyle, and D. R. Olson, "A Moire-free platform for LCD backlighting," in Proc. SID Tech. Digest (San Francisco, USA, Jun. 2006), pp. 1336-1339.
  12. B.-Y. Joo and J.-H. Ko, "Analysis of color uniformity of white LED lens packages for direct-lit LCD backlight applications," J. Opt. Soc. Korea 17, 506-512 (2013). https://doi.org/10.3807/JOSK.2013.17.6.506
  13. Optimization Module User's Guide (LightTools v8.1, Synopsys, 2013).