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Sensors 2015, 15(11), 28732-28741; doi:10.3390/s151128732

Development of a Carbon Nanotube-Based Touchscreen Capable of Multi-Touch and Multi-Force Sensing

1
Next Generation Convergence Sensor Research Center, Korea Electronics Technology Institute, 25, Saenari-ro, Bundang-gu, Seongnam-si, Gyeonggi-do 463-816, Korea
2
Display and Nanosystem Laboratory, Department of Electrical Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 27 August 2015 / Revised: 4 November 2015 / Accepted: 5 November 2015 / Published: 13 November 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4070 KB, uploaded 13 November 2015]   |  

Abstract

A force sensing touchscreen, which detects touch point and touch force simultaneously by sensing a change in electric capacitance, was designed and fabricated. It was made with single-walled carbon nanotubes (SWCNTs) which have better mechanical and chemical characteristics than the indium-tin-oxide transparent electrodes used in most contemporary touchscreen devices. The SWCNTs, with a transmittance of about 85% and electric conductivity of 400 Ω per square; were coated and patterned on glass and polyethyleneterephthalate (PET) film substrates. The constructed force sensing touchscreen has a total size and thickness of 62 mm × 100 mm × 1.4 mm, and is composed of 11 driving line and 19 receiving line channels. The gap between the channels was designed to be 20 µm, taking visibility into consideration, and patterned by a photolithography and plasma etching processes. The mutual capacitance formed by the upper and lower transparent electrodes was initially about 2.8 pF and, on applying a 500 gf force with a 3 mm diameter tip, it showed a 25% capacitance variation. Furthermore, the touchscreen can detect multiple touches and forces simultaneously and is unaffected by touch material characteristics, such as conductance or non-conductance. View Full-Text
Keywords: single-walled carbon nanotubes (SWCNTs); touchscreen; multi-touch; multi-force single-walled carbon nanotubes (SWCNTs); touchscreen; multi-touch; multi-force
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, W.; Oh, H.; Kwak, Y.; Park, K.; Ju, B.-K.; Kim, K. Development of a Carbon Nanotube-Based Touchscreen Capable of Multi-Touch and Multi-Force Sensing. Sensors 2015, 15, 28732-28741.

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