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Sensors 2009, 9(2), 1188-1203; doi:10.3390/s9021188
Article

Flexible Electronics Sensors for Tactile Multi-Touching

1, 2
,
3
,
2
 and
1,*
1 Department of Engineering Science, National Cheng Kung University, Tainan 701, Taiwan 2 Microsystems Technology Center, Industrial Technology Research Institute, Tainan 709, Taiwan 3 Institute of Mechanical and Electromechanical Engineering, National Formosa University, Yunlin 632, Taiwan
* Author to whom correspondence should be addressed.
Received: 12 February 2009 / Revised: 20 February 2009 / Accepted: 23 February 2009 / Published: 24 February 2009
(This article belongs to the Section Chemical Sensors)
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Abstract

Flexible electronics sensors for tactile applications in multi-touch sensing and large scale manufacturing were designed and fabricated. The sensors are based on polyimide substrates, with thixotropy materials used to print organic resistances and a bump on the top polyimide layer. The gap between the bottom electrode layer and the resistance layer provides a buffer distance to reduce erroneous contact during large bending. Experimental results show that the top membrane with a bump protrusion and a resistance layer had a large deflection and a quick sensitive response. The bump and resistance layer provided a concentrated von Mises stress force and inertial force on the top membrane center. When the top membrane had no bump, it had a transient response delay time and took longer to reach steady-state. For printing thick structures of flexible electronics sensors, diffusion effects and dimensional shrinkages can be improved by using a paste material with a high viscosity. Linear algorithm matrixes with Gaussian elimination and control system scanning were used for multi-touch detection. Flexible electronics sensors were printed with a resistance thickness of about 32 µm and a bump thickness of about 0.2 mm. Feasibility studies show that printing technology is appropriate for large scale manufacturing, producing sensors at a low cost.
Keywords: Flexible electronics; tactile; bending; organic resistance; multi-touching; printing technology; large area Flexible electronics; tactile; bending; organic resistance; multi-touching; printing technology; large area
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Chang, W.-Y.; Fang, T.-H.; Yeh, S.-H.; Lin, Y.-C. Flexible Electronics Sensors for Tactile Multi-Touching. Sensors 2009, 9, 1188-1203.

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