Position detecting device that selects electrodes having different intervals therebetween while different signals are detected
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United States of America Patent
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Oct 6, 2020
Grant Date -
Sep 21, 2017
app pub date -
Jun 2, 2017
filing date -
Jan 6, 2015
priority date (Note) -
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Abstract
A position detecting device obtains information from a stylus when the stylus moves at high speed, while removing influences of noise. The position detecting device includes a differential amplification circuit that amplifies and outputs a difference in a signal at a first terminal and a signal at a second terminal, and a selection circuit that selects at least a first electrode of a sensor, connects at least the first electrode to the first terminal of the differential amplification circuit, selects at least a second electrode of the sensor, and connects at least the second electrode to the second terminal of the differential amplification circuit. The selection circuit selects electrodes separated by a first interval in a period in which a position indicated by the stylus is detected, and selects electrodes separated by a second interval that is shorter than the first interval in a period in which data is detected.
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