A highly sensitive capacitive touch sensor integrated on a thin-film-encapsulated active-matrix OLED for ultrathin displays

Sunkook Kim, Woong Choi, Woojin Rim, Youngtea Chun, Hongsik Shim, Hyukjun Kwon, Jongsoo Kim, Inseo Kee, Sungchul Kim, Sangyoon Lee, Jongsun Park

Research output: Contribution to journalArticle

51 Citations (Scopus)


This paper presents ultrathin and highly sensitive input/output devices consisting of a capacitive touch sensor (Cap-TSP) integrated on thin-film-encapsulated active-matrix organic light-emitting diodes (OLEDs). The optimal structure of the electrically noise-free capacitive touch sensor, which is assembled on a thin-film-encapsulated active-matrix OLED (AMOLED) display, is obtained by investigating the internal electrical field distribution and capacitance change based on the Q3D Extractor model. Electrostatic simulations have verified malfunction-free electrical signals for 4-in diagonal-sized capacitive touch sensors on AMOLEDs possessing a 100- μm-thick optically clear adhesive (OCA, εr = 1.4) layer. The prototype OLED platform using the capacitive touch sensors exhibits an overall thickness of 1.2 mm, which is the lowest thickness for commercially available OLED platforms.

Original languageEnglish
Article number5991941
Pages (from-to)3609-3615
Number of pages7
JournalIEEE Transactions on Electron Devices
Issue number10
Publication statusPublished - 2011 Oct 1



  • Active-matrix organic light-emitting diode (AMOLED)
  • capacitive touch sensor (Cap-TSP)
  • noise
  • ultrathin display

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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