Tablet with system power saving features including reactivation

Details Tablet with system power saving features including reactivation Tablet with system power saving features including reactivation

1994-12-14

1996-10-22

Malzahn, David H.

Boots, shoes, and leggings

178 19, G08C 2100

Patent

active

055684092

ABSTRACT:
A tablet system has an improved operation for saving power. During a digitizing period, the tablet supplies power to resistive sheets that produce analog pen position signals and to the sample and hold circuit and the analog to digital converter that operate on these signals. During a wait state, power is removed from these components and a separate circuit detects contact with the tablet surface by a pen. A pen activity circuit that uses less power is also disclosed. The pen activity detecting circuit has a resistor in circuit with the two resistive sheets. This resistor and associated circuits are independent of the normal path for signals that denote pen position and thereby allow these components to be turned off. When the pen is positioned on the tablet surface, the two resistive sheets are brought into contact in the normal way for detecting the pen position. During a period of pen inactivity, this contact produces a current in the resistor. The associated voltage is detected and power is applied to the resistive sheets and to the sample and hold circuit and analog to digital converter for normal operation.

REFERENCES:
patent: 5266750 (1993-11-01), Yatsuzuka
patent: 5324895 (1994-06-01), Inamori et al.
patent: 5384721 (1995-01-01), Joto
patent: 5396443 (1995-03-01), Mese et al.
patent: 5416726 (1995-05-01), Garcia-Duarte et al.
patent: 5423045 (1995-06-01), Kannan et al.

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