Electroquasistatics of the capacitive touch panel

Philip T Krein, R. David Meadows

Research output: Contribution to journalArticlepeer-review


A practical panel must be safe and inexpensive and must sense position accurately in spite of electrical noise, dirt, or direct electrostatic discharge. The implementation discussed uses a quasistatic electric field, applied to a semiconducting coating on the panel surface. A touch draws current from the surface. This current can be used to compute position. If the computation is performed properly, the computed position is independent of touch current and panel coating resistivity. The electroquasistatic basis for position measurement with a capacitive touch panel and a system to implement it are described.

Original languageEnglish (US)
Pages (from-to)1712-1716
Number of pages5
JournalConference Record - IAS Annual Meeting (IEEE Industry Applications Society)
Volume35 n 6
StatePublished - 1988

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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