Design and Implementation of Readout Circuit on Glass Substrate for Touch Panel Applications

Tzu Ming Wang, Ming Dou Ker, Ming-Dou Ker

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

A readout circuit on glass substrate for touch panel application has been designed and fabricated in a 3-µm low temperature poly-silicon (LTPS) technology. In this work, the switch-capacitor (SC) technique is applied to amplify the small voltage difference from capacitance change due to the touch event on panel. In addition, the corrected double-sampling (CDS) technique is also employed to reduce the offset originated from LTPS process variation. The minimum detectable voltage difference of the proposed circuit is 40 mV. To further identify the different touch area during touch events, a 4-bit analog-to-digital converter is used to converter the output of readout circuit into 4-bit digital codes.

Original languageEnglish
Pages (from-to)290-297
Number of pages8
JournalIEEE/OSA Journal of Display Technology
Volume6
Issue number8
DOIs
StatePublished - 1 Jan 2010

Keywords

  • Low temperature poly-silicon (LTPS)
  • readout circuit
  • system-on-panel (SOP)
  • touch panel

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