Capacitive touch detection

Details Capacitive touch detection Capacitive touch detection

1995-08-28

1999-03-09

Liang, Regina

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

341 33, G09G 500

Patent

active

058807187

ABSTRACT:
A capacitive touch detection system, which can be used to inhibit motorized faders in an audio mixing system, includes touch detection circuits each having a respective conductive area for touch determination by detection of increased capacitance at the conductive area. The touch detection circuits are operable during predetermined active periods initiated by a clock generator which activates a pulse generator to produce an enable pulse EP1 for one detection circuit. The trailing edge of that enable pulse EP1 generates a non-overlapping enable pulse EP2 for the next detection circuit, and the process continues so that no more than one detection circuit is active at any time. This minimizes interaction between detection circuits if more than one conductive area is touched simultaneously.

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patent: 4550310 (1985-10-01), Yamaguchi
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patent: 5233666 (1993-08-01), Deveau
patent: 5293102 (1994-03-01), Martinson et al.

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