Patent ID: 9600096
Date: 2017-03-21
CPC Classifications: G06F,G09G

Claim:
1. A position detecting device comprising: a sensor in which a plurality of electrodes is disposed in at least a first direction; a differential amplifier circuit that includes a first input terminal and a second input terminal and that outputs a differential signal based on signals supplied to the first input terminal and the second input terminal; and an electrode selection circuit that selects electrodes for connection to the first input terminal and the second input terminal of the differential amplifier circuit from the plurality of electrodes disposed in the sensor, wherein a position indicated by a stylus pen that generates an electric field based on electric field coupling between the stylus pen and the sensor is detected based on the differential signal output from the differential amplifier circuit, and wherein if the differential signal output from the differential amplifier circuit corresponding to a first electrode selection pattern set by the electrode selection circuit satisfies a set predetermined condition, a second electrode selection pattern different from the first electrode selection pattern is set by the electrode selection circuit to detect the position indicated by the stylus pen, wherein whether or not the set predetermined condition is satisfied is determined based on the differential signal that is generated corresponding to a height of the stylus pen in a height direction relative to a sensor surface of the sensor and is output from the differential amplifier circuit.