Stylus sensing system
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United States of America Patent
Stats
-
May 26, 1992
Grant Date -
N/A
app pub date -
Oct 31, 1990
filing date -
Oct 31, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved finger touch and stylus detection system for use on the surface of a display device is disclosed. An overlay having horizontal and vertical transparent conductors is coupled to the other elements of the system through a bus having a minimum number of bus wires. A control processor issues command signals which selectively couples the transparent conductors to a capacitive measuring device and a radiative measuring device to determine finger and stylus position respectively. The improvements to the system include a radiative stylus having a spherical antenna which receives the overlay signal independent of the angle at which it is held. Further, a contact detecting mode has been added to eliminate spurious stylus positions measured between strokes, when the stylus is proximate to but not in contact with the overlay.
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Cited Art Landscape
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