Browse > Article

Fabrication of Anti-moiré Filter with Light Diffusing Particles Using Slot-die Coating  

Hong, Songeun (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Jeon, Kyungjun (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Shin, Youngkyun (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Park, Jongwoon (School of Electrical & Electronic & Communication Engineering, Korea University of Technology and Education)
Publication Information
Journal of the Semiconductor & Display Technology / v.21, no.4, 2022 , pp. 33-38 More about this Journal
Abstract
With an attempt to suppress the moiré phenomenon caused by the interference between the black matrix of a display panel and the metal grid of a camera, we have fabricated an anti-moiré filter using light diffusing particles (LDPs) with the average diameter of 20 ㎛. It is demonstrated that the anti-moiré filter coated on a glass substrate (370 mm × 470 mm) using a table slot-die coater reduces the moiré intensity to a great extent when the area covered by LDPs is 50%. To quantify the intensity of moiré phenomenon, we have measured the lightness ratio and found that it is reduced from 132.12 down to 105.71 by the filter. To find the optimum area covered by LDPs, we have performed ray tracing simulations using Mie scatters as a substitute for LDPs. From the simulated irradiation distribution, we have calculated the standard deviation (SD) and contrast ratio (CR) to evaluate the moiré strength. As expected, the SD and CR values decrease with increasing covered area by LDPs. However, there exists a trade-off between the transmittance of the filter and its capability of reducing the moiré intensity in determining the area covered by LDPs.
Keywords
Moire phenomenon; Anti-moire filter; Light diffusing particle; Slot-die coating; Ray tracing simulation;
Citations & Related Records
연도 인용수 순위
  • Reference
1 I. Amidor, "The Theory of the Moire Phenomenon Volume I: Periodic Layers," Springer, 2009.
2 L. Kong, G. Jin, T. Wang, S. Cai, X. Zhong, and K. Xu, "Parameter design of a parallax barrier based on the color moire patterns in autostereoscopic display", Appl. Opt., Vol. 50, pp. 153-158, 2011.
3 D. K. Shin and J. W. Park, "Angular Dependence of Moire Fringes Induced by Metal Grids for Touch Screen Panels", Displays. Technol., Vol. 11, pp. 110-117, 2015.   DOI
4 Y. Takaki, O. Yokoyama, and G. Hamagishi, "Flat panel display with slanted pixel arrangement for 16- view display", Proc. SPIE, Vol. 7237, 723708, 2009.
5 M. Okui, M. Kobayashi, J. Arai, and F. Olano, "Moire fringe reduction by optical filters in integral three-dimensional imaging on a color flat-panel display", Applied Optics, Vol. 44, pp. 4475-4483, 2005.   DOI
6 C. Chen, Y. Yeh, and H. Shieh, "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.
7 E. Chen, J. Cai, X. Zeng, S. Xu, Y. Ye, QF. Yan, and T. Guo, "Ultra-large moire-less autostereoscopic three-dimensional light-emitting-diode displays", Opt. Express, Vol. 27, pp. 10355-10369, 2019.   DOI
8 DK. Shin, and J. Park, "Design of moire-free metal meshes using ray tracing for touch screen panels", Displays, Vol. 38, pp. 9-19, 2015.   DOI
9 Jeon. K, Lee. J, and Park. J, "Fabrication of Anti- Moire Filter Using Multi-Array Needle coating for LED screens," Journal of the Semiconductor & Display Technology, Vol. 14, pp. 23-27, 2015.