Capacitance Sensor of Frequency Modulation for Integrated Touchpanels Using Amorphous In-Sn-Zn-O Thin-Film Transistors
IEICE Transactions on Electronics
Online ISSN : 1745-1353
Print ISSN : 0916-8524
Special Section on Electronic Displays
Capacitance Sensor of Frequency Modulation for Integrated Touchpanels Using Amorphous In-Sn-Zn-O Thin-Film Transistors
Yuki KOGA, Tokiyoshi MATSUDA, Mutsumi KIMURA, Dapeng WANG, Mamoru FURUTA, Masashi KASAMI, Shigekazu TOMAI, Koki YANO
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Keywords: capacitance sensor, frequency modulation, integrated touchpanel, amorphous In-Sn-Zn-O (α-ITZO), thin-film transistor (TFT)
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2015 Volume E98.C Issue 11 Pages 1028-1031

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Abstract

We have developed a capacitance sensor of frequency modulation for integrated touchpanels using amorphous In-Sn-Zn-O (α-ITZO) thin-film transistors (TFTs). This capacitance sensor consists of a ring oscillator, whose one stage is replaced by a reset transistor, sensing transistor, and sensing electrode. The sensing electrode is prepared as one terminal to form a sensing capacitor when the other terminal is added by a finger. The ring oscillator consists of pseudo CMOS inverters. We confirm that the oscillation frequency changes when the other terminal is added. This result suggests that this capacitance sensor can be applied to integrated touchpanels on flatpanel displays.

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© 2015 The Institute of Electronics, Information and Communication Engineers
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