Tablet with system power saving features including reactivation by pencontact after inactive period
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United States of America Patent
Stats
-
Jun 1, 1999
Issued Date -
N/A
app pub date -
Oct 21, 1996
filing date -
Dec 14, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digitizing tablet has an improved operation for saving power. After an input device contacts the tablet surface, resistive sheets provide analog pen position signals to a sample/track and hold circuit. Once the signals are captured by the sample/track and hold, power is removed from the resistive sheets and digitization of the analog signals is performed. During an input waiting period, power is further conserved by removing power from the sample/track and hold and analog-to-digital converter, as a separate level detect circuit detects contact with the tablet surface by an input device.
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