05889236 is referenced by 450 patents and cites 148 patents.

A proximity sensor system includes 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.

Title
Pressure sensitive scrollbar feature
Application Number
895934
Publication Number
5889236
Application Date
November 13, 1995
Publication Date
March 30, 1999
Inventor
Aaron T Ferrucci
Santa Cruz
CA, US
Timothy P Allen
Los Gatos
CA, US
David Gillespie
Palo Alto
CA, US
Agent
D Alessandro & Ritchie
Assignee
Synaptics Incorporated
CA, US
IPC
G08C 21/00
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