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In-cell Capacitive Touch Panel Structures and Their Readout Circuits

Title
In-cell Capacitive Touch Panel Structures and Their Readout Circuits
Author
권오경
Keywords
Tactile sensors; Capacitance; Signal to noise ratio; Simulation; Electrodes; Thin film transistors
Issue Date
2016-07
Publisher
Society for informatino display
Citation
The 23rd International Workshop on Active-Matrix Flatpanel Displays and Devices (2016), Page. 256-261
Abstract
This paper proposes an in-cell capacitive touch panel structure and a readout circuit (ROIC) to sense the variation in self-capacitance using a small number of sensing lines. The proposed touch panel structure sequentially senses the variation in self-capacitance by adding a thin-film transistor and a scan signal line into each touch sensor so that the number of sensing lines can be reduced. In addition, the proposed ROIC enhances the signal-to-noise ratio (SNR) by compensating for the stray capacitance. The simulation results show that the proposed ROIC achieves an SNR of 57 dB. Moreover, the number of sensing lines per inch is 6.7 and 230.8 using the proposed active self-capacitive sensing method and the advanced in-cell touch (AIT) technology, respectively. Therefore, the proposed active self-capacitive sensing method reduces the number of sensing lines by 97.10 % compared with the AIT technology, while maintaining high sensitivity and multi-touch sensing capability.
URI
https://ieeexplore.ieee.org/document/7543685/http://repository.hanyang.ac.kr/handle/20.500.11754/74502
ISBN
978-4-9908753-0-5; 978-4-9908753-1-2
DOI
10.1109/AM-FPD.2016.7543685
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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