Journal of the Semiconductor & Display Technology (반도체디스플레이기술학회지)

The Korean Society Of Semiconductor & Display Technology (한국반도체디스플레이기술학회)
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Fabrication of Anti-Moiré Filter Using Multi-Array Needle Coating for LED Screens

다중 배열 니들 코팅을 이용한 LED 스크린용 Anti-Moiré 필터 제작

  • Jeon, Kyungjun (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education) ;
  • Lee, Jinyoung (Interdisciplinary Program in Creative Engineering, Korea University of Technology and Education) ;
  • Park, Jongwoon (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
  • 전경준 (한국기술교육대학교 전기.전자.통신공학부) ;
  • 이진영 (한국기술교육대학교 창의융합공학협동과정) ;
  • 박종운 (한국기술교육대학교 전기.전자.통신공학부)
  • Received : 2021.03.10
  • Accepted : 2021.03.18
  • Published : 2021.03.31
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Abstract

Using a multi-array needle module developed for coating of high-density cylindrical microlens array (C-MLA), we have fabricated an anti-Moiré filter for LED screens. The Moiré phenomenon appears due to the interference between the array pattern of image sensors in a camera and the non-emission area (grid pattern) of a LED screen. To suppress it, we have employed poly(methyl methacrylate) (PMMA) and coated it on a glass substrate in the form of a grid and non-grid (parallel lines). We have rotated the needle module in order to increase the number of C-MLAs. With this scheme, we have fabricated the 150 mm × 150 mm anti-Moiré filters where 836 microlens lines are formed. They show the average width of 255.4 ㎛, the average distance between CMLs of 94.6 ㎛, and C-MLA width non-uniformity of 4.7%. We have shown that the Moiré patterns still appear in the presence of the parallel (non-grid)-type filter, whereas they disappeared completely by the grid-type filter. It is due to the fact that the Moiré patterns are diffused more effectively by the grid-type C-MLA.

Keywords

References

  1. Lin, K., Liaom N., Zhao, D., Dong, S., and Li, Y., "Analysis of Moire minimization in color LED flat-panel display", Proc. SPIE, Vol. 9618, 96180K, 2015.
  2. Shin, D., and Park, J. "Angular Dependence of Moire Fringes Induced by Metal Grids for Touch Screen Panels", J. Dips. Technol., Vol. 11, pp. 110-117, 2015. https://doi.org/10.1109/JDT.2014.2363198
  3. Takaki, Y., Yokoyama, O., and Hamagishi, G., "Flat panel display with slanted pixel arrangement for 16-view display", Proc. SPIE, Vol. 7237, 723708, 2009.
  4. Kong, L. et al., "Parameter design of a parallax barrier based on the color moire patterns in autostereoscopic display", Appl. Opt., Vol. 50, pp. 153-158, 2011.
  5. Chen, C., Yeh, Y., and Shieh, H., "3-D Mobile Display Based on Moire-Free Dual Directional Backlight and Driving Scheme for Image Crosstalk Reduction", J. Dips. Technol., Vol. 4, pp. 92-96 2008. https://doi.org/10.1109/JDT.2007.903145
  6. Chen, E. et al., "Ultra-large moire-less autostereoscopic three-dimensional light-emitting-diode displays", Opt. Express, Vol. 27, pp. 10355-10369, 2019. https://doi.org/10.1364/oe.27.010355