Paintbrush stylus for capacitive touch sensor pad

Details Paintbrush stylus for capacitive touch sensor pad Paintbrush stylus for capacitive touch sensor pad

1994-10-17

1996-01-30

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

345179, G08C 2100

Patent

active

054882044

ABSTRACT:
A proximity sensor system includes a touch-sensor pad with a sensor matrix array having a characteristic capacitance on horizontal and vertical conductors connected to sensor pads. The capacitance changes as a function of the proximity of an object or objects to the sensor matrix. The change in capacitance of each node in both the X and Y directions of the matrix due to the approach of an object is converted to a set of voltages in the X and Y directions. These voltages are processed by circuitry to develop electrical signals representative of the centroid of the profile of the object, i.e, its position in the X and Y dimensions. Noise reduction and background level setting techniques inherently available in the architecture are employed. A conductive paintbrush-type stylus is used to produce paint-like strokes on a display associated with the touch-sensor pad.

REFERENCES:
patent: 5231450 (1993-07-01), Daniels
patent: 5369227 (1994-11-01), Stone
patent: 5373118 (1994-12-01), Uktson
patent: 5408593 (1995-04-01), Kotaki et al.

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