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Design and Implement the Readout Circuit of an In-Cell High-Resolution Capacitive Touch Panel

[+] Author Affiliations
Tsung-Yen Ku, Tong-Wen Wang

National Chiao Tung University, Tainan, Taiwan

Paul C.-P. Chao

National Chiao Tung University, Hsinchu, Taiwan

Chin-Hai Huang, En-Chih Liu, Ming-Hua Yeh

Chungwa Picture Tubes, Ltd, Taoyuan, Taiwan

Han-Chang Chen

Richip Technology, Taipei, Taiwan

Paper No. ISPS2017-5436, pp. V001T09A001; 3 pages
doi:10.1115/ISPS2017-5436
From:
  • ASME 2017 Conference on Information Storage and Processing Systems collocated with the ASME 2017 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems
  • ASME 2017 Conference on Information Storage and Processing Systems
  • San Francisco, California, USA, August 29–30, 2017
  • Conference Sponsors: Information Storage and Processing Systems Division
  • ISBN: 978-0-7918-5810-3
  • Copyright © 2017 by ASME

abstract

This paper proposes a high resolution capacitive touch panel readout circuit to sense the Variation by self-capacitance method. This AM display of in-cell structure includes an active architecture for improved resolution, that controlling the TFT (Thin-film transistor) to make the accuracy better. In addition, the panel has 60 sensing point per 0.88 inches and the proposed readout circuit used switched capacitor charge amplifier (SCCA) to sensing the charge change and enhances the SNR (Signal-to-noise) by eliminating the baseline. The experimental results show that the proposed readout circuit SNR achieves 38dB and the frame rate is 200Hz.

Copyright © 2017 by ASME

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