Active matrix touch sensor detecting time-constant change implemented by IGZO TFTs

Lu Sheng Chou*, Hao Lin Chiu, Kuan Ta Lin, Ya-Hsiang Tai

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We propose a novel concept of using the RC time-constant to sense the capacitance change induced by touch and demonstrate it with a sensing circuit implemented by IGZO TFTs. The pixel circuit is consisted of one resistor and two TFTs in series, which are sequentially turned by consecutive gate pulses. By increasing the delay time of the first gate pulse waveform, a large transient ON current can flow through the TFTs while the second pulse comes, and thus become a significant sensing signal. This pixel consumes low power because the transient current only occurs when a pixel is touched.

Original languageEnglish
Title of host publication49th Annual SID Symposium, Seminar, and Exhibition 2011, Display Week 2011
Pages1841-1844
Number of pages4
StatePublished - 1 Dec 2011
Event49th Annual SID Symposium, Seminar, and Exhibition 2011, Display Week 2011 - Los Angeles, CA, United States
Duration: 15 May 201120 May 2011

Publication series

Name49th Annual SID Symposium, Seminar, and Exhibition 2011, Display Week 2011
Volume3

Conference

Conference49th Annual SID Symposium, Seminar, and Exhibition 2011, Display Week 2011
CountryUnited States
CityLos Angeles, CA
Period15/05/1120/05/11

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