Embedded Touch Sensing Circuit Using Mutual Capacitance for Active-Matrix Organic Light-Emitting Diode Display
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概要
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We propose and simulate an embedded touch sensing circuit for active-matrix organic light-emitting diode (AMOLED) displays. The circuit consists of three thin-film transistors (TFTs), one fixed capacitor, and one variable capacitor. AMOLED displays do not have a variable capacitance characteristic, so we realized a variable capacitor to detect touches in the sensing pixel by exploiting the change in the mutual capacitance between two electrodes that is caused by touch. When a dielectric substance approaches two electrodes, the electric field is shunted so that the mutual capacitance decreases. We use the existing TFT process to form the variable capacitor, so no additional process is needed. We use advanced solid-phase-crystallization TFTs because of their stability and uniformity. The proposed circuit detects multi-touch points by a scanning process.
- 2011-03-25
著者
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Park Sang-ho
Department Of Chemical Engineering Hanyang University
-
Kim Ohyun
Department Of Electrical And Electronic Engineering
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Seok Su-Jeong
Department of Electronic and Electrical Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
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Park Young-Ju
Department of Electronic and Electrical Engineering, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
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