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 language | English |
|---|---|
| Title of host publication | Advances in Display Technologies VI |
| Editors | Ming Hsien Wu, Sin-Doo Lee, Liang-Chy Chien |
| Publisher | SPIE |
| ISBN (Electronic) | 9781510600058 |
| DOIs | |
| Publication status | Published - 2016 Jan 1 |
| Event | Advances in Display Technologies VI - San Francisco, United States Duration: 2016 Feb 18 → … |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 9770 |
| ISSN (Print) | 0277-786X |
| ISSN (Electronic) | 1996-756X |
Other
| Other | Advances in Display Technologies VI |
|---|---|
| Country | United States |
| City | San Francisco |
| Period | 16/2/18 → … |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering
Cite this
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Numerical evaluation of moiré pattern in touch sensor module with electrode mesh structure in oblique view. / Pournoury, M.; Zamiri, A.; Kim, T. Y.; Yurlov, V.; Oh, K.
Advances in Display Technologies VI. ed. / Ming Hsien Wu; Sin-Doo Lee; Liang-Chy Chien. SPIE, 2016. 97700B (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9770).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Numerical evaluation of moiré pattern in touch sensor module with electrode mesh structure in oblique view
AU - Pournoury, M.
AU - Zamiri, A.
AU - Kim, T. Y.
AU - Yurlov, V.
AU - Oh, K.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84978632057&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84978632057&partnerID=8YFLogxK
U2 - 10.1117/12.2207826
DO - 10.1117/12.2207826
M3 - Conference contribution
AN - SCOPUS:84978632057
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Advances in Display Technologies VI
A2 - Wu, Ming Hsien
A2 - Lee, Sin-Doo
A2 - Chien, Liang-Chy
PB - SPIE
ER -