Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1996-02-20
1998-07-07
Brier, Jeffery
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
345179, G06F 302
Patent
active
057776075
ABSTRACT:
A data entry device with a resistive layer enables a user to enter data both by finger and stylus. The stylus is electrically connected to the device. An AC driver drives the layer with a time-varying voltage for capacitive finger detection. A DC driver drives the layer with a substantially constant voltage for resistive stylus detection. The AC driver is disabled when the capacitance of the stylus relative to ground is increased due to the user's hand holding the stylus.
REFERENCES:
patent: 5231381 (1993-07-01), Duwaer
patent: 5365461 (1994-11-01), Stein et al.
Brier Jeffery
U.S. Philips Corporation
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