Moire simulation and analysis on non-rectangular sub-pixel metal mesh touch screen

When the moire pattern on the metal grid touch screen is simulated and analyzed by the sub-pixel transmittance calculating matrix of LCD, if the sub-pixel shape of LCD is non-standard non rectangular shape, the accuracy of algorithm prediction results will be low because of the large shape error. In order to solve this problem and provide the reliability of algorithm prediction results, this paper aims at a non rectangular sub-pixel LCD touch screen with specific shape, by improving the generation algorithm of sub-pixel shape, the computer simulation is used to generate sub- pixel shape graphics closer to the real shape, scan and calculate its transmittance matrix. Then, the obtained moire simulation pattern is processed by neighborhood filtering and low-pass filtering in the frequency domain to obtain the characteristic frequency reflecting the moire visibility. A moire visibility prediction table with metal mesh parameters as independent variables is generated, and the prediction results of moire visibility are given in combination with the judgment frequency obtained from theexperiment. The experimental results show that when 2 lp.mm(-1) is used as the judgment frequency,the overall matching rate of the improved algorithm is increased from 76. 4% to 79. 5%, and the available matching rate is increased from 67. 57% to 84. 51%. The accuracy and reliability of the algorithm are significantly improved, which can provide more reliable prediction results for the manufacturers of metal grid touch screen.