Display-integrated type tablet device capable of detecting corre

Details Display-integrated type tablet device capable of detecting corre Display-integrated type tablet device capable of detecting corre

1994-04-05

1996-02-13

Beausoliel, Jr., Robert W.

Excavating

341 5, 178 19, 345104, 345174, G06F 1100

Patent

active

054917069

ABSTRACT:
An induction voltage signal induced at a detection electrode of a detection pen is binarized by a slice voltage "e.sub.s ". The number of pulses existing in the binary signal is counted by a counting device. The resulting count value obtained by the counting device and the number of times of electrode scanning in an x-coordinate detection period or a y-coordinate detection period are compared with each other by means of a comparator. When the number of pulses is greater, an error detection alarm signal is output by an alarm device. Thus the existence of the pulses based on the error detection signal is detected in the binary signal based on the induction voltage signal from the detection electrode to output the error detection alarm signal. The above arrangement allows the coordinates at the tip end of the detection pen to be detected in a stable and correct manner even when external noise is detected.

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