Proceedings ArticleDOI
Numerical evaluation of moiré pattern in touch sensor module with electrode mesh structure in oblique view
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TLDR
In this paper, the visibility problem of the metal-mesh in touch sensor module (TSM) is numerically considered, based on human eye contract sensitivity function (CSF), moire pattern of TSM electrode mesh structure is simulated with MATLAB software for 8 inch screen display in oblique view.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 moire 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), moire pattern of TSM electrode mesh structure is simulated with MATLAB software for 8 inch screen display in oblique view. Standard deviation of the generated moire by the superposition of electrode mesh and screen image is calculated to find the optimal parameters which provide the minimum moire 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 moire pattern are predicted compared to normal view.read more
Citations
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Journal ArticleDOI
On-screen fingerprint sensor with optically and electrically tailored transparent electrode patterns for use on high-resolution mobile displays
Hyun-Joon Kim-Lee,Seog Woo Hong,Dong-Kyun Kim,Jinmyoung Kim,Hong Suk Kim,Seok-whan Chung,Eun-Hyoung Cho,Hae-Sung Kim,Byung-Kyu Lee +8 more
TL;DR: A mutual capacitive-type on-screen fingerprint sensor, which can recognize fingerprints on a display screen to provide smartphones with full-screen displays with a minimal bezel area, is fabricated and demonstrated with a prototype built on a commercial smartphone.
Journal ArticleDOI
Minimization of Moiré effect generated by a double-layered metal mesh on top of the R-G-B optical source
TL;DR: In this paper, the Fourier transform was utilized to analyze Moire pattern for a two-layer metal mesh structure nonadjacent to an intensity patterned light source with a micron size separation.
Journal ArticleDOI
Visibility minimization of the moiré pattern on a display screen by optimizing geometrical parameters using an F/θ plot
TL;DR: In this article, the visibility issue of the moire pattern may appear on display screens as a result of the interference between screen pixel array and other periodical structures having size of pitch close to that of the pixel array.
Journal ArticleDOI
Fast numerical Fourier analysis of moiré pattern induced by a periodic metallic array on top of the microscopically patterned red-green-blue light sources.
TL;DR: An accurate and fast moiré pattern analysis algorithm is proposed for a periodic metallic array placed adjacent to a patterned red-green-blue (RGB) light source with a microscopic gap utilizing Fourier transform along with the human eye contrast sensitivity function.
Journal ArticleDOI
Moiré-free fingerprint sensors based on multilayer oxide-metal-oxide electrodes.
Eun-Hyoung Cho,Hyun-joon Kim,Bon Won Koo,Seog Woo Hong,Jung Yeon Won,Hae-Sung Kim,Hong Suk Kim,Seok-whan Chung,Yongsung Kim,Byung-Kyu Lee,Chang Seung Lee +10 more
TL;DR: A moiré-free fingerprint sensor is proposed that uses an oxide-metal-oxide (IZO/Ag/IZO) multilayer as a highly transparent electrode and it is demonstrated experimentally that the proposed electrode greatly reduces the undesirable moirÉ phenomenon.
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