Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1997-09-23
1999-12-14
Shalwala, Bipin
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
178 1801, 178 1806, G09G 500
Patent
active
060023899
ABSTRACT:
The present invention provides a touch pad which can detect a simply stylus using a change capacitance. The touch pad is made flexible, so that the stylus pressure compresses an insulating layer between a conductive reference layer and matrix of conductive traces. The compression causes a change in capacitance due to either the two capacitive conductive surfaces being closer to each other, or a variation of the dielectric value of the insulating layer due to the replacement of air in air gaps by the material of the insulating layer.
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Kovalick Vincent E.
Logitech Inc.
Shalwala Bipin
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