Analysis and prediction of Moiré pattern on metal mesh touch screen based on two dimensional Fourier transformation

Abstract This paper presents a novel algorithm to analyze and judge the visibility of Moire appearing on metal mesh touch screen whose resolution is 2 K from spatial frequency domain by using Fourier transformation. In this method, we utilize the characteristic spatial frequency to represent the visibility of Moire, and two-dimensional Fourier transformation is performed on the simulation image obtained by calculating the pixel transmittance. The characteristic frequency is obtained by frequency filtering, and the Moire visibility is evaluated according to it. In this paper, three different displays are used for experiments, 1.89 lp/mm, 1.94 lp/mm and 1.85 lp/mm are taken respectively as the dividing line to classify the performance of Moire. The matching ratios of the three displays are 84.47%, 82.30% and 80.12% respectively, showing pretty high accuracy with the practical matching result. This new method may be quite useful for guiding the manufacture of metal mesh touch panel.