Journal of the Optical Society of Korea

  • 제17권6호
  • /
  • Pages.506-512
  • /
  • 2013
  • /
  • 1226-4776(pISSN)
  • /
  • 2093-6885(eISSN)
한국광학회 (Optical Society of Korea)
권호 표지
DOI QR코드

DOI QR Code

Analysis of Color Uniformity of White LED Lens Packages for Direct-lit LCD Backlight Applications

  • Joo, Byung-Yun (Department of Mechanical Engineering, Korea University of Technology and Education) ;
  • Ko, Jae-Hyeon (Department of Physics, Hallym University)
  • 투고 : 2013.08.19
  • 심사 : 2013.10.14
  • 발행 : 2013.12.25
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Recently, the color separation issue of wide-spreading white LEDs has attracted attention due to their wide applicability as light sources in direct-lit LCD backlights. These wide-spreading LED packages usually consist of LED chips, a color-conversion phosphor layer, and a light-shaping lens. The technical aspect of this color issue was related to a method for balancing the yellow spectral component emitting from phosphors with respect to the blue one from the LED chip as a function of viewing angle. In this study, we suggested an approach for carrying out quantitative analysis for the color separation problem occurring in wide-spreading LED packages by optical simulation. In addition, the effect of an internal scattering layer on the color uniformity was investigated, which may be considered as a potential solution for this problem.

키워드

참고문헌

  1. C.-G. Son, J.-H. Yi, J.-S. Gwag, J.-H. Kwon, and G.-J. Park, "Improvement of color and luminance uniformity of the edge-lit backlight using the RGB LEDs," J. Opt. Soc. Korea 15, 272-277 (2011). https://doi.org/10.3807/JOSK.2011.15.3.272
  2. 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. Inf. Disp. 12, 167-171 (2011). https://doi.org/10.1080/15980316.2011.621307
  3. http://www.enplas.co.jp/english/wp/wp-content/themes/enplas_en/images/led/lec.pdf
  4. G. H. Bak and S. W. Lee, "Lens and light emitting apparatus having the same," US8213093B2 (2012).
  5. J. H. Seo and J. H. Jang, "Lens for side light emitting and light emitting device using the lens," KR100660721B1 (2006).
  6. D.-H. Kim, C.-H. Lee, K.-Y. Lee, and K.-I. Park, "Side illumination lens and luminescent device using the same, Seoul semiconductor," US7901113B2 (2010).
  7. Core Module User's Guide (LightTools v8.0, Synopsys, 2013).
  8. Advanced Physics Module User's Guide (LightTools v8.0, Synopsys, 2013).
  9. R. Hu, X. Luo, and S. Liu, "Study on the optical properties of conformal coating light-emitting diode by Monte Carlo simulation," IEEE Photon. Technol. Lett. 23, 1673-1675 (2011). https://doi.org/10.1109/LPT.2011.2166381

피인용 문헌

  1. Optimization of nano-honeycomb structures for flexible w-LEDs vol.25, pp.17, 2017, https://doi.org/10.1364/OE.25.020466
  2. Simulation Study on the Minimization of Moiré Patterns Caused by Microlens Array Films for Backlight Applications vol.18, pp.5, 2014, https://doi.org/10.3807/JOSK.2014.18.5.538
  3. Fabrication of Three-Dimensional Reflective White Pattern using Dry-Film Resist vol.19, pp.1, 2015, https://doi.org/10.3807/JOSK.2015.19.1.080
  4. Determination of the optimal amount of scattering in a wavelength conversion plate for white LEDs vol.23, pp.24, 2015, https://doi.org/10.1364/OE.23.0A1629
  5. Simulation Study of Injection-Molded Light Guide Plates for Improving Luminance Uniformity Based on the Measured Replication Quality of Micro-Patterns for LED TV Backlight vol.19, pp.2, 2015, https://doi.org/10.3807/JOSK.2015.19.2.159
  6. Fabrication of Viewing Angle Direction Brightness-Enhancement Optical Films using Surface Textured Silicon Wafers vol.18, pp.5, 2014, https://doi.org/10.3807/JOSK.2014.18.5.569
  7. Recovering the Colors of Objects from Multiple Near-IR Images vol.19, pp.1, 2015, https://doi.org/10.3807/JOSK.2015.19.1.102