Development of a Carbon Nanotube-Based Touchscreen Capable of Multi-Touch and Multi-Force Sensing
AbstractA 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
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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.
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(11):28732-28741.Chicago/Turabian Style
Kim, Wonhyo; Oh, Haekwan; Kwak, Yeonhwa; Park, Kwangbum; Ju, Byeong-Kwon; Kim, Kunnyun. 2015. "Development of a Carbon Nanotube-Based Touchscreen Capable of Multi-Touch and Multi-Force Sensing." Sensors 15, no. 11: 28732-28741.