Active in-cell touch circuit using floating common electrode as sensing pad for the large size in-plane-switching liquid crystal displays

Ya-Hsiang Tai, Chi Hao Lin*, Wei Jia Cheu

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

In this paper, we propose an in-cell active touch circuit using the concept of floating common electrode for large size in-plane-switching liquid crystal displays. Compared with the conventional passive in-cell touch circuit, the proposed method can greatly reduce the readout channel numbers by sharing the sensing bus for one column. Because the touch signal is amplified in the pixel, the touch panel can be easily scaled up in size. Simulation results show that the difference between touch and no-touch signals can be as large as 10 μA even with threshold voltage shift of ±1 V. The possible issues of the proposed method are experimentally verified.

Original languageEnglish
Pages (from-to)610-620
Number of pages11
JournalJournal of the Society for Information Display
Volume25
Issue number10
DOIs
StatePublished - 1 Oct 2017

Keywords

  • active in-cell touch
  • floating common electrode
  • in-plane-switching
  • liquid crystal display

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