Input detection device

1. An input detection device comprising:

a first signal wiring having an end portion, and arranged so as to extend in a first direction from the end portion;

a plurality of drive electrodes each having a first end portion, each extending in a second direction crossing the first direction, and including a first drive electrode and a second electrode, and including a first drive electrode and a second drive electrode;

a plurality of first switches each arranged between each of the first end portions of the drive electrodes and the first signal wiring;

a drive signal circuit supplying a drive signal to the end portion of the first signal wiring; and

a selection circuit controlling the first switches to electrically connect the first end portions of the plurality of drive electrodes and the first signal wiring,

wherein a distance between the second drive electrode and the end portion of the first signal wiring is larger than a distance between the first drive electrode and the end of the first signal wiring, and

when proximity of an external object is detected based on a magnetic field, the first switches electrically connecting the first drive electrode to the first signal wiring are smaller in number than the first switches electrically connecting the second drive electrode to the first signal wiring.

2. The input detection device according to claim 1 ,

wherein the first switches arranged between the first drive electrode and the first signal wiring, and the first switches arranged between the second drive electrode and the first signal wiring are the same in number.

3. The input detection device according to claim 1 ,

wherein when the proximity of the external object is detected based on an electric field, the first switches electrically connecting the first drive electrode to the first signal wiring, and the first switches electrically connecting the second drive electrode to the first signal wiring are the same in number.

4. The input detection device according to claim 1 , further comprising:

a second signal wiring supplied with a drive signal having a first voltage; and

a plurality of second switches each arranged between each of the first end portions of the plurality of drive electrodes and the second signal wiring,

wherein when the proximity of the external object is detected based on an electric field, the drive electrodes not electrically connected to the first signal wiring by the first switches are electrically connected to the second signal wiring by the second switches.

5. The input detection device according to claim 4 , further comprising:

a third signal wiring having an end portion supplied with a drive signal from the drive signal circuit, the third signal wiring extending in the first direction; and

a plurality of third switches arranged between a second end portion of each of the drive electrodes and the third signal wiring, and controlled by the selection circuit,

wherein when the proximity of the external object is detected based on a magnetic field, the third switches electrically connecting the first drive electrode to the third signal wiring are smaller in number than the third switches electrically connecting the second drive electrode to the third signal wiring.

6. The input detection device according to claim 5 ,

wherein when the proximity of the external object is detected based on an electric field, the third switches electrically connecting the first drive electrode to the third signal wiring, and the third switches electrically connecting the second drive electrode to the third signal wiring are the same in number.

7. The input detection device according to claim 6 , further comprising:

a fourth signal wiring supplied with a drive signal having a first voltage; and

a plurality of fourth switches arranged between the second end portion of each of the plurality of drive electrodes and the fourth signal wiring,

wherein the drive electrodes not electrically connected to the first signal wiring and the third signal wiring by the first switches and the third switches are electrically connected to the second signal wiring and the fourth signal wiring by the second switches and the fourth switches.

8. The input detection device according to claim 7 , further comprising:

a plurality of pixels each having a pixel electrode arranged so as to oppose the drive electrodes,

wherein when display is performed with the plurality of pixels, the first end portion of each of the plurality of drive electrodes is electrically connected to the second signal wiring by the second switches, and the second end portion of each of the plurality of drive electrodes is electrically connected to the fourth signal wiring by the fourth switches.

9. An input detection device comprising:

a first signal wiring having an end portion, and arranged so as to extend in a first direction from the end portion;

a plurality of drive electrodes each having a first end portion and a second end portion, each extending in a second direction crossing the first direction, arranged in parallel to the first direction, and including a first drive electrode and a second drive electrode;

a drive signal circuit supplying a drive signal to the end portion of the first signal wiring;

a first number of switches connected in parallel between the first end portion of each of the plurality of drive electrodes and the first signal wiring; and

a selection circuit controlling a switch connected between the first end portion of each of the plurality of drive electrodes and the first signal wiring,

wherein the first number of switches includes:

a first connection switch; and

second connection switches to be brought into conduction states when proximity of an external object is detected based on a magnetic field,

wherein a distance between the second drive electrode and the end portion of the first signal wiring is farther than a distance between the first drive electrode and the end portion of the first signal wiring, and

wherein the second connection switches connected between the first end portion of the first drive electrode and the first signal wiring are smaller in number than the second connection switches connected between the first end portion of the second drive electrode and the first signal wiring.

10. The input detection device according to claim 9 ,

wherein when the proximity of the external object is detected based on an electric field, the first connection switch and the second connection switches included in the first number of switches are brought into conduction states.

11. The input detection device according to claim 9 ,

wherein each of the first number of switches includes a transistor,

the second connection switches connected between the second drive electrode and the first signal wiring each include a transistor having a first channel width, and the second connection switches connected between the first drive electrode and the first signal wiring each include a transistor having a second channel width, and

the first connection switch connected between the second drive electrode and the first signal wiring includes a transistor having a third channel width, the first connection switch connected between the first drive electrode and the first signal wiring includes a transistor having a fourth channel width, the first channel width is larger than the third channel width, and the second channel width is smaller than the forth channel width.

12. The input detection device according to claim 9 ,

wherein each of the first number of switches includes a transistor, and

the second connection switches connected between the second drive electrode and the first signal wiring each include a transistor having a first channel width, the second connection switches connected between the first drive electrode and the first signal wiring each include a transistor having a second channel width, and the second channel width is smaller than the first channel width.

13. The input detection device according to claim 12 ,

wherein the first connection switch connected between the second drive electrode and the first signal wiring includes a transistor having a third channel width, the second connection switches-connected between the first drive electrode and the first signal wiring each include a transistor having a fourth channel width, and the fourth channel width is larger than the third channel width.

14. The input detection device according to claim 9 ,

wherein the drive electrodes supplied with the drive signal in detecting the proximity of the external object based on a magnetic field are larger in number than the drive electrodes supplied with the drive signal in detecting the proximity of the external object based on the electric field.