Numerical evaluation of moiré pattern in touch sensor module with electrode mesh structure in oblique view

M. Pournoury, A. Zamiri, T. Y. Kim, V. Yurlov, K. Oh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Capacitive touch sensor screen with the metal materials has recently become qualified for substitution of ITO; however several obstacles still have to be solved. One of the most important issues is moiré phenomenon. The visibility problem of the metal-mesh, in touch sensor module (TSM) is numerically considered in this paper. Based on human eye contract sensitivity function (CSF), moiré pattern of TSM electrode mesh structure is simulated with MATLAB software for 8 inch screen display in oblique view. Standard deviation of the generated moiré by the superposition of electrode mesh and screen image is calculated to find the optimal parameters which provide the minimum moiré visibility. To create the screen pixel array and mesh electrode, rectangular function is used. The filtered image, in frequency domain, is obtained by multiplication of Fourier transform of the finite mesh pattern (product of screen pixel and mesh electrode) with the calculated CSF function for three different observer distances (L=200, 300 and 400 mm). It is observed that the discrepancy between analytical and numerical results is less than 0.6% for 400 mm viewer distance. Moreover, in the case of oblique view due to considering the thickness of the finite film between mesh electrodes and screen, different points of minimum standard deviation of moiré pattern are predicted compared to normal view.

Original languageEnglish
Title of host publicationAdvances in Display Technologies VI
EditorsMing Hsien Wu, Sin-Doo Lee, Liang-Chy Chien
PublisherSPIE
ISBN (Electronic)9781510600058
DOIs
Publication statusPublished - 2016
EventAdvances in Display Technologies VI - San Francisco, United States
Duration: 2016 Feb 18 → …

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9770
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherAdvances in Display Technologies VI
CountryUnited States
CitySan Francisco
Period16/2/18 → …

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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    Pournoury, M., Zamiri, A., Kim, T. Y., Yurlov, V., & Oh, K. (2016). Numerical evaluation of moiré pattern in touch sensor module with electrode mesh structure in oblique view. In M. H. Wu, S-D. Lee, & L-C. Chien (Eds.), Advances in Display Technologies VI [97700B] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9770). SPIE. https://doi.org/10.1117/12.2207826