Design and implementation of readout circuit on glass substrate with digital correction for touch-panel applications

Tzu Ming Wang, Ming-Dou Ker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A readout circuit on glass substrate with digital correction, which contains a transconductance amplifier, counter, and digital correction circuit, has been designed for touch-panel applications for 3-μm low-temperature polysilicon (LTPS) technology. The voltage difference as a result of a change in capacitance due to a touch event is converted to current by a transconductance amplifier. By charging and discharging the capacitor in the counter, the counter displays different digital-output codes according to touch or non-touch events. Furthermore, not only can the touch or non-touch event be distinguished, but also the influence of LTPS process variation can be compensated by a digital correction circuit in the proposed readout circuit.

Original languageEnglish
Pages (from-to)463-470
Number of pages8
JournalJournal of the Society for Information Display
Volume19
Issue number7
DOIs
StatePublished - 1 Jul 2011

Keywords

  • Digital correction
  • Low-temperature polysilicon (LTPS)
  • Readout circuit
  • System-on-panel (SOP)
  • Touch panel

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