Electronic device, manufacturing method and operation method thereof, electronic copy system

1. An electronic device, comprising a plurality of pixel units arranged in an array, each pixel unit comprising:

a Hall-effect working electrode, comprising a first contact position, a second contact position, a third contact position, and a fourth contact position, wherein a line connecting the first contact position and the second contact position intersects a line connecting the third contact position and the fourth contact position;

a thin film transistor, comprising a gate electrode, a source electrode and a drain electrode, wherein the drain electrode is electrically connected with the first contact position;

a gate line, electrically connected with the gate electrode;

a first common line, electrically connected with the Hall-effect working electrode through the third contact position;

a second common line, electrically connected with the Hall-effect working electrode through the fourth contact position;

a data line, electrically connected with the source electrode; and

a sensing line, electrically connected with the second contact position.

2. The electronic device according to claim 1 , wherein

the line connecting the first contact position and the second contact position is perpendicular to the line connecting the third contact position and the fourth contact position.

3. The electronic device according to claim 1 , further comprising a magnetic material layer, wherein

the electronic device comprises a working surface, and the magnetic material layer is disposed at a side of the Hall-effect working electrode away from the working surface.

4. The electronic device according to claim 1 , further comprising a first connection line and a second connection line, wherein

two ends of the first connection line are respectively electrically connected to the first contact position and the drain electrode, and two ends of the second connection line are respectively electrically connected to the second contact position and the sensing line.

5. The electronic device according to claim 1 , wherein

the Hall-effect working electrode is formed of a conductive material or a semiconductor material.

6. The electronic device according to claim 5 , wherein

the thin film transistor further comprises a semiconductor pattern, and the Hall-effect working electrode, which is formed of the semiconductor material, and the semiconductor pattern are formed in a same layer.

7. The electronic device according to claim 5 , wherein

the Hall-effect working electrode, which is formed of the conductive material, is formed in a same layer as the source electrode and the drain electrode.

8. The electronic device according to claim 1 , further comprising a third connection line and a fourth connection line, wherein

two ends of the third connection line are respectively electrically connected to the third contact position and the first common line, and two ends of the fourth connection line are respectively electrically connected to the fourth contact position and the second common line.

9. The electronic device according to claim 8 , further comprising a protection layer, wherein

the protection layer is disposed at a side of the third connection line away from the gate electrode.

10. The electronic device according to claim 1 , further comprising a control circuit, wherein

the control circuit is electrically connected with the data line and the gate line, and is configured to apply a scan signal to the gate line and receive a voltage signal outputted from the data line.

11. An operation method for the electronic device according to claim 1 , comprising:

applying a scan voltage to the gate line, so as to turn on the thin film transistor in a pixel unit connected to the gate line;

applying a first current to the Hall-effect working electrode through the first common line and the second common line; and

detecting a Hall voltage signal of the Hall-effect working electrode through the data line and the sensing line, wherein whether this pixel unit is operated or not is determined according to the Hall voltage signal.

12. The operation method according to claim 11 , further comprising:

scanning the plurality of pixel units arranged in an array and determining whether each pixel unit is operated or not, so as to obtain an image corresponding to the plurality of pixel units.

13. An electronic copy system, comprising the electronic device according to claim 1 and a magnetic pen.

14. The electronic copy system according to claim 13 , wherein

the magnetic pen comprises an operation portion made of a magnetic material.

15. A manufacturing method of an electronic device, comprising:

forming a Hall-effect working electrode, wherein the Hall-effect working electrode comprises a first contact position, a second contact position, a third contact position, and a fourth contact position, and a line connecting the first contact position and the second contact position intersects a line connecting the third contact position and the fourth contact position;

forming a thin film transistor, wherein the thin film transistor comprises a gate electrode, a source electrode and a drain electrode, and the drain electrode is electrically connected with the first contact position;

forming a gate line, wherein the gate line is electrically connected with the gate electrode;

forming a first common line, wherein the first common line is electrically connected with the Hall-effect working electrode through the third contact position;

forming a second common line, wherein the second common line is electrically connected with the Hall-effect working electrode through the fourth contact position;

forming a data line, wherein the data line is electrically connected with the source electrode; and

forming a sensing line, wherein the sensing line is electrically connected with the second contact position.