Sensor signal processing circuit and sensor signal processing method

A position detecting device comprising:

• a sensor including:
• a first conductor disposed in a first direction, and
• a second conductor disposed in a second direction different from the first direction;
• and
• a sensor signal processing circuit connected to the sensor, including:
• a signal supply circuit configured to supply a first signal to the first conductor,
• a first signal detecting circuit connected to the second conductor, and
• a control circuit configured to perform control of detecting a proximity of an indicator to the sensor based on a change in a capacitance between the second conductor and a ground by controlling the first signal detecting circuit, and perform control of detecting a position indicated by the indicator on the sensor based on a change in a capacitance at a point of intersection formed by the second conductor and the first conductor supplied with the first signal from the signal supply circuit by controlling the signal supply circuit and the first signal detecting circuit based on a result of comparing, with a predetermined value, a detection result based on the change in the capacitance between the second conductor and the grounding node, the detection result being output from the first signal detecting circuit.

A sensor signal processing method performed by a control circuit included in a sensor signal processing circuit connected to a sensor, the sensor including a first conductor disposed in a first direction and a second conductor disposed in a second direction different from the first direction, the sensor signal processing method comprising:

• detecting a proximity of an indicator to the sensor based on a change in a capacitance between the second conductor and a ground by controlling a first signal detecting circuit connected to the second conductor;
• comparing, with a predetermined value, a detection result output from the first signal detecting circuit based on the change in the capacitance between the second conductor and the ground;
• and
• detecting a position indicated by the indicator on the sensor based on a change in a capacitance at a point of intersection formed by the second conductor and the first conductor supplied with a first signal from a signal supply circuit by controlling the signal supply circuit supplying the first signal to the first conductor and the first signal detecting circuit based on a result of the comparing.