Electronic device to detect input based on a capacitance change and input of an input device

1. An electronic device comprising:

a display layer;

a sensor layer on the display layer, and comprising:

a plurality of electrodes comprising a first electrode, and a second electrode adjacent to the first electrode; and

a plurality of crossing electrodes; and

a driving circuit electrically connected to the sensor layer, and configured to control an operation of the sensor layer,

wherein the sensor layer is configured to operate in a first touch mode to sense a first input signal based on a capacitance change, and a second touch mode to sense a second input signal of an input device configured to discharge a magnetic field, and

wherein the driving circuit is configured to sense coordinates of the input device based on a signal profile, the signal profile being measured based on a first current having a first current direction formed in the first electrode by the magnetic field of the input device, and a second current having a second current direction opposite to the first current direction formed in the second electrode by the magnetic field of the input device.

2. The electronic device of claim 1 , wherein the driving circuit comprises an analog front end comprising:

an amplifier configured to amplify the first input signal and the second input signal; and

a filter configured to remove noise from a signal output from the amplifier.

3. The electronic device of claim 2 , wherein the analog front end further comprises:

a sample and hold circuit configured to perform a sample and hold operation on a signal output from the filter.

4. The electronic device of claim 2 , wherein the amplifier comprises:

an inverting input terminal connected to the first electrode; and

a non-inverting input terminal connected to the second electrode.

5. The electronic device of claim 2 , wherein the amplifier comprises:

an inverting input terminal connected to the first electrode; and

a non-inverting input terminal connected to a reference potential.

6. The electronic device of claim 2 , wherein the second input signal comprises a position signal and a data signal,

wherein the driving circuit further comprises a sync controller connected to the analog front end, and

wherein the sync controller comprises:

a sync data providing circuit configured to provide a sync signal that is inverted to the position signal;

an XOR gate connected to the analog front end and the sync data providing circuit, the XOR gate being configured to perform a XOR operation based on the position signal and the sync signal; and

a sync determining circuit configured to determine a synchronization state of the second input signal, based on a result of the XOR operation.

7. The electronic device of claim 1 , wherein the driving circuit comprises:

a first analog front end configured to receive the first input signal;

a second analog front end configured to receive the second input signal; and

a switching circuit configured to select one of the first analog front end and the second analog front end.

8. The electronic device of claim 1 , wherein the first current in the signal profile has a negative value, and the second current in the signal profile has a positive value, and

wherein the driving circuit is configured to calculate the coordinates of the input device based on a zero-crossing value of the signal profile.

9. The electronic device of claim 1 , wherein the driving circuit is configured to:

calculate a first signal profile by changing a sign of a portion of the signal profile;

calculate a second signal profile by rotating the first signal profile, such that the second signal profile is symmetrical to the first signal profile about a first axis; and

calculate the coordinates of the input device, based on a peak value of the second signal profile.

10. The electronic device of claim 9 , wherein the driving circuit is configured to:

calculate a plurality of signal profiles;

calculate a superimposed signal profile by adding the plurality of signal profiles;

change a sign in the superimposed signal profile; and

calculate the coordinates of the input device, based on a peak value of a value symmetrical about the first axis.

11. The electronic device of claim 1 , wherein the plurality of electrodes further comprise:

a third electrode interposed between the first electrode and the second electrode; and

a fourth electrode interposed between the first electrode and the third electrode, and

wherein the driving circuit is configured to:

calculate a first differential signal profile measured based on the first electrode and the third electrode; and

calculate the coordinates of the input device, based on a zero-crossing value of the first differential signal profile.

12. The electronic device of claim 11 , wherein the driving circuit is configured to:

calculate a second differential signal profile by changing a sign of a portion of the first differential signal profile; and

calculate the coordinates of the input device, based on a peak value of the second differential signal profile.

13. The electronic device of claim 11 , wherein the driving circuit is configured to:

calculate a fourth differential signal profile measured based on the third electrode and the fourth electrode; and

calculate the coordinates of the input device, based on a peak value of the fourth differential signal profile.

14. The electronic device of claim 13 , wherein the driving circuit is configured to:

calculate a fifth differential signal profile by changing a sign of a portion of the fourth differential signal profile; and

calculate the coordinates of the input device, based on a zero-crossing value of the fifth differential signal profile.

15. An electronic device comprising:

a display layer;

a sensor layer on the display layer, the sensor layer being configured to operate in a first touch mode to sense a first input signal based on a capacitance change, and a second touch mode to sense a second input signal of an input device configured to discharge a magnetic field; and

a driving circuit electrically connected to the sensor layer to control an operation of the sensor layer,

wherein the driving circuit comprises:

an analog front end configured to convert an analog signal of the second input signal into a digital signal; and

a sync controller connected to the analog front end, the sync controller comprising:

a sync data providing circuit configured to provide a sync signal that is inverted to a position signal of the second input signal;

an XOR gate connected to the analog front end and the sync data providing circuit, the XOR gate configured to perform a XOR operation based on the position signal and the sync signal; and

a sync determining circuit configured to determine a synchronization state of the second input signal, based on a result of the XOR operation.

16. The electronic device of claim 15 , wherein the sensor layer comprises:

a plurality of electrodes comprising:

a first electrode; and

a second electrode adjacent to the first electrode; and

a plurality of crossing electrodes, and

wherein the driving circuit is configured to sense coordinates of the input device based on a signal profile, the signal profile being measured based on a first current having a first current direction formed in the first electrode by the input device, and a second current having a second current direction opposite to the first current direction formed in the second electrode by the input device.

17. The electronic device of claim 16 , wherein the first current in the signal profile has a negative value, and the second current in the signal profile has a positive value, and

wherein the driving circuit is configured to calculate the coordinates of the input device, based on a zero-crossing value of the signal profile.

18. The electronic device of claim 16 , wherein the driving circuit is configured to:

calculate a first signal profile by converting a sign of a portion of the signal profile;

calculate a second signal profile by rotating the first signal profile, such that the second signal profile is symmetrical to the first signal profile about a first axis; and

calculate the coordinates of the input device, based on a peak value of the second signal profile.

19. The electronic device of claim 16 , wherein the plurality of electrodes further comprise:

a third electrode interposed between the first electrode and the second electrode; and

a fourth electrode interposed between the first electrode and the third electrode,

wherein the driving circuit is configured to calculate a first differential signal profile measured based on the first electrode and the third electrode,

wherein the driving circuit is configured to calculate a second differential signal profile by changing a sign of a portion of the first differential signal profile, and

wherein the driving circuit is configured to calculate the coordinates of the input device, based on a zero-crossing value of the first differential signal profile, or a peak value of the second differential signal profile.

20. The electronic device of claim 16 , wherein the plurality of electrodes further comprise:

a third electrode interposed between the first electrode and the second electrode, and a fourth electrode interposed between the first electrode and the third electrode,

wherein the driving circuit is configured to calculate a fourth differential signal profile measured based on the third electrode and the fourth electrode,

wherein the driving circuit is configured to calculate a fifth differential signal profile by changing a sign of a portion of the fourth differential signal profile, and

wherein the driving circuit is configured to calculate the coordinates of the input device based on a peak value of the fourth differential signal profile, or a zero-crossing value of the fifth differential signal profile.