Sound production device, display device, and terminal

1. A sound production device for a display device, the display device comprising a display substrate, the display substrate having an opening area and a non-opening area, the sound production device comprising:

a first electrode layer arranged on the display substrate;

an insulating layer arranged on a side of the first electrode layer away from the display substrate;

an electromagnetic coil arranged on a side of the insulating layer away from the first electrode layer, wherein a vertical projection of the electromagnetic coil on the display substrate falls on the non-opening area, the insulating layer defines a via, and the electromagnetic coil and the first electrode layer are electrically connected through the via; and

a magnetic diaphragm arranged on a side of the electromagnetic coil away from the insulating layer and configured to vibrate and produce sounds in response to a magnetic field generated by the electromagnetic coil, wherein a vertical projection of the magnetic diaphragm on the display substrate falls on the non-opening area.

2. The sound production device as claimed in claim 1 , further comprising:

a diaphragm support arranged on the side of the insulating layer away from the first electrode layer, wherein the magnetic diaphragm is connected to the diaphragm support, and a vertical projection of the diaphragm support on the display substrate falls on the non-opening area.

3. The sound production device as claimed in claim 2 , wherein the diaphragm support surrounds the electromagnetic coil.

4. The sound production device as claimed in claim 3 , further comprising:

a diaphragm packaging layer arranged on the insulating layer and encapsulating the electromagnetic coil, the diaphragm support and the magnetic diaphragm.

5. The sound production device as claimed in claim 4 , wherein there is an air gap between the magnetic diaphragm and the electromagnetic coil.

6. The sound production device as claimed in claim 4 , wherein a filling layer is arranged between the magnetic diaphragm and the electromagnetic coil.

7. The sound production device as claimed in claim 1 , wherein the first electrode layer is arranged on a side of the display substrate close to a display light output side.

8. The sound production device as claimed in claim 1 , wherein the display substrate comprises a driving circuit layer, the driving circuit layer comprises a pixel circuit power line configured to supply power to a pixel circuit, and the electromagnetic coil comprises the pixel circuit power line.

9. The sound production device as claimed in claim 8 , wherein the electromagnetic coil comprises at least one of a pixel electrode power line and a common electrode power line.

10. The sound production device as claimed in claim 1 , wherein the first electrode layer and the electromagnetic coil are configured to receive an alternating driving signal, and the electromagnetic coil generates a magnetic field in response to the alternating driving signal.

11. The sound production device as claimed in claim 10 , further comprising:

a sounding driving circuit connected to the first electrode layer and the electromagnetic coil and configured to output the alternating driving signal.

12. The sound production device as claimed in claim 1 , wherein the first electrode layer is a transparent electrode layer, the insulating layer is a transparent insulating layer.

13. The sound production device as claimed in claim 1 , wherein a vertical projection of the first electrode layer on the display substrate falls on the non-opening area, a vertical projection of the insulating layer on the display substrate falls on the non-opening area.

14. A display device, comprising:

a display substrate having an opening area and a non-opening area; and

at least one sound production device, arrayed on the display substrate; wherein each of the at least one sound production device comprises:

a first electrode layer arranged on the display substrate;

an insulating layer arranged on a side of the first electrode layer away from the display substrate;

an electromagnetic coil arranged on a side of the insulating layer away from the first electrode layer, wherein a vertical projection of the electromagnetic coil on the display substrate falls on the non-opening area, the insulating layer defines a via, and the electromagnetic coil and the first electrode layer are electrically connected through the via; and

a magnetic diaphragm arranged on a side of the electromagnetic coil away from the insulating layer, spaced apart from the electromagnetic coil and configured to vibrate and produce sounds in response to a magnetic field generated by the electromagnetic coil, wherein a vertical projection of the magnetic diaphragm on the display substrate falls on the non-opening area.

15. The display device as claimed in claim 14 , wherein the display device comprises a plurality of sound production devices, the plurality of sound production devices are arrayed on the display substrate, the non-opening area of the display device comprises a plurality of sound producing areas, and the plurality of sound production devices are arranged in the plurality of sound producing areas in one-to-one correspondence.

16. The display device as claimed in claim 14 , wherein the at least one sound production device is connected to a sounding driving circuit, the sounding driving circuit comprises at least one switch sub circuit, the at least one switch sub circuit and the at least one sound production device have a one-to-one correspondence; each of the at least one switch sub circuit is connected to the electromagnetic coil of a corresponding sound production device; and each of the at least one switch sub circuit turns on in response to a switch control signal and transmits an alternating driving signal to a corresponding electromagnetic coil.

17. The display device as claimed in claim 14 , wherein the at least one sound production device is arranged on a side of the display substrate close to a display light output side, or on a side of the display substrate away from the display light output side, or between layers of the display substrate.

18. The display device as claimed in claim 14 , wherein the insulating layer is shared by a plurality of sound production devices in response to the at least one sound production device comprising the plurality of sound production devices; the insulating layer covers the display substrate and a plurality of vias are provided in the insulating layer; the plurality of vias and the plurality of sound production devices are in one-to-one correspondence.

19. The display device as claimed in claim 14 , further comprising:

a protective layer arranged on at least one side of the at least one sound production device away from the display substrate.

20. A terminal, comprising:

a display device, comprising:

a display substrate, the display substrate having an opening area and a non-opening area; and

at least one sound production device arranged on the display substrate; wherein each of the at least one sound production device comprises:

a first electrode layer arranged on the display substrate;

an insulating layer arranged on a side of the first electrode layer away from the display substrate;

an electromagnetic coil arranged on a side of the insulating layer away from the first electrode layer, wherein a vertical projection of the electromagnetic coil on the display substrate falls on the non-opening area, the insulating layer defines a via, and the electromagnetic coil and the first electrode layer are electrically connected through the via; and

a magnetic diaphragm arranged on a side of the electromagnetic coil away from the insulating layer and configured to vibrate and produce sounds in response to a magnetic field generated by the electromagnetic coil, wherein a vertical projection of the magnetic diaphragm on the display substrate falls on the non-opening area.