Annular potentiometric touch sensor

Details Annular potentiometric touch sensor Annular potentiometric touch sensor

2007-12-18

2007-12-18

Piziali, Jeff (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C178S018050

Reexamination Certificate

active

11129805

ABSTRACT:
The present invention determines angular position using a potentiometric touch sensor. The sensor has an annular pattern of resistive material on a bottom substrate top surface. Conductive drive lines radially traverse the resistive material so as to make electrical connection with the resistive material. A top substrate is spaced above the top surface of the bottom substrate. A conductive sense layer on a bottom surface of the top substrate is positioned above the resistive material. Pressure applied to either the top substrate or the bottom substrate, such as by the touch of a user, causes a portion of the conductive sense layer to contact a corresponding portion of the annular pattern of resistive material. The angular position of the applied pressure can be determined by measuring at least one electrical parameter between at least one of the conductive drive lines and the conductive sense layer.

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