Sensor device includes a capacitive touch panel configured to detect an input device having a resonance circuit that includes two conductors, input device, and method

1. A sensor device comprising:

a capacitive touch panel comprising a plurality of electrodes;

an input device configured such that a resonance circuit comprising a first conductor and a second conductor is covered with a non-conductor; and

a sensor controller configured to control the touch panel, wherein

the first conductor and the second conductor are capacitively coupled to at least one of a plurality of electrodes in the touch panel when the input device is disposed on the touch panel or when the input device disposed on the touch panel is operated,

the sensor controller is configured to:

acquire a first detection value in the plurality of electrodes by applying a voltage to the plurality of electrodes in the touch panel based on a non-resonance frequency of the resonance circuit when power of the touch panel is turned on;

acquire a second detection value in the plurality of electrodes by applying a voltage to the plurality of electrodes in the touch panel based on a resonance frequency of the resonance circuit; and

detect positions of the first conductor and the second conductor by comparing the first detection value with the second detection value,

the touch panel is mounted on a display device, and

the sensor controller is configured to:

perform a first operation of displaying an image on the display device and a second operation of detecting positions of the first conductor, the second conductor and another object on the touch panel by time division;

when positions of the first conductor and the second conductor are detected and a position of the other object is not detected from a second region other than a first region in which the input device is disposed, update a first detection value acquired by applying a voltage to an electrode corresponding to the second region based on a second detection value acquired by applying a voltage to an electrode corresponding to the second region; and

further detect positions of the first conductor and the second conductor using the updated first detection value.

2. The sensor device according to claim 1 , wherein

the sensor controller is configured to:

when positions of the first conductor and the second conductor are detected, further acquire a third detection value in the plurality of electrodes by applying a voltage to an electrode corresponding to the first region based on a non-resonance frequency of the resonance circuit;

update a first detection value acquired by applying a voltage to an electrode corresponding to the first region based on the third detection value; and

further detect positions of the first conductor and the second conductor using the updated first detection value.

3. The sensor device according to claim 1 , wherein

the sensor controller is configured to:

further acquire a third detection value in the plurality of electrodes by applying a voltage to the plurality of electrodes in the touch panel based on a non-resonance frequency of the resonance circuit;

update the first detection value based on the third detection value; and

further detect positions of the first conductor and the second conductor using the updated first detection value.

4. The sensor device according to claim 1 , wherein

the plurality of electrodes comprise a first electrode facing the first conductor and a second electrode facing the second conductor when the input device is disposed on the touch panel, and

the sensor controller is configured to detect a position of the first conductor by applying a voltage to the first electrode, and detect a position of the second conductor by applying a voltage to the second electrode.

5. The sensor device according to claim 1 , wherein the resonance circuit is a circuit in which an inductor and a capacitor are connected in parallel between the first conductor and the second conductor.

6. The sensor device according to claim 1 , wherein

the input device is formed as a knob that is rotatable about a rotation axis,

the first conductor and the second conductor are held by the knob and disposed on a part of a circumference around the rotation axis, and

the sensor controller is configured to detect positions of the first conductor and the second conductor when the knob disposed on the touch panel is rotated.

7. The sensor device according to claim 1 , wherein

the input device is formed as a button capable of switching between a first state in which the button is pressed and a second state in which the button is not pressed,

the first conductor and the second conductor are disposed in the input device so as to be capacitively coupled to at least one of the plurality of electrodes in the touch panel in the first state and so as not to be capacitively coupled to a plurality of electrodes in the touch panel in the second state, and

the sensor controller is configured to detect positions of the first conductor and the second conductor when the input device is in the first state.

8. The sensor device according to claim 1 , wherein

the input device is formed as a slider comprising a first member formed to extend in at least one direction and a second member formed to be slidable along the first member,

the first conductor is disposed in an inside of the first member,

the second conductor is disposed in an inside of the second member, and

the sensor controller is configured to detect positions of the first conductor and the second conductor when the second member is slid to the first member.

9. The sensor device according to claim 1 , wherein the sensor controller is configured to detect positions of the first conductor and the second conductor based on a self-capacitance of the plurality of electrodes in the touch panel.

10. The sensor device according to claim 1 , wherein

the plurality of electrodes in the touch panel comprises a plurality of first electrodes disposed side by side in a second direction intersecting with a first direction so as to extend in the first direction, and a plurality of second electrodes disposed side by side in the first direction so as to extend in the second direction, and

the sensor controller is configured to detect positions of the first conductor and the second conductor based on mutual capacitance between the plurality of first electrodes and the plurality of second electrodes.

11. The sensor device according to claim 10 , wherein

the first conductor and the second conductor face at least one of the plurality of first electrodes when the input device is disposed on the touch panel,

the first conductor and the second conductor face at least one of the plurality of second electrodes when the input device is disposed on the touch panel, and

a first electrode facing the first conductor and a first electrode facing the second conductor are different, and a second electrode facing the first conductor and a second electrode facing the second conductor are different.