Electronic device and middle frame thereof

1. A middle frame of an electronic device, comprising:

a supporting frame provided with a supporting surface configured to support an edge area of a transparent cover plate of the electronic device;

an inner sidewall connected to the supporting surface; and

at least one groove disposed in the inner sidewall and connected to the supporting surface, the at least one groove being configured for receiving a light source of an under-screen fingerprint recognition circuit,

wherein the under-screen fingerprint recognition circuit further comprises a flexible circuit board, the light source is connected to the flexible circuit board, the flexible circuit board is located outside the groove, the flexible circuit board is attached onto the inner sidewall, the light source is provided with a light-emitting surface that faces the transparent cover plate, an orthographic projection of the light-emitting surface on the flexible circuit board is located outside the flexible circuit board, and a distance between the light-emitting surface and the transparent cover plate is not greater than a distance between the flexible circuit board and the transparent cover plate.

2. The middle frame according to claim 1 , wherein the at least one groove comprises a plurality of grooves arranged at intervals.

3. The middle frame according to claim 2 , wherein the supporting frame takes the shape of a rectangular frame, and the plurality of grooves are located on a same side of the rectangular frame.

4. The middle frame according to claim 3 , wherein the plurality of grooves are symmetrically distributed about a midpoint of one side of the rectangular frame.

5. The middle frame according to claim 1 , further comprising a supporting plate configured to support a display of the electronic device and connected to the inner sidewall, wherein a light-transmitting hole configured to cooperate with a receiver of the under-screen fingerprint recognition circuit is disposed in the supporting plate.

6. The middle frame according to claim 1 , wherein the supporting frame comprises a limiting rib located on the supporting surface, and the limiting rib and the supporting surface constitute a spigot structure for limiting the transparent cover plate.

7. The middle frame according to claim 1 , wherein a limiting boss for limiting a flexible circuit board connected to the light source is disposed on the inner sidewall, and in a direction perpendicular to the supporting surface, the limiting boss is located between a surface, opposite to the supporting surface, of the supporting frame and the groove.

8. An electronic device, comprising a middle frame that comprises:

a supporting frame provided with a supporting surface configured to support an edge area of a transparent cover plate of the electronic device;

an inner sidewall connected to the supporting surface; and

at least one groove disposed in the inner sidewall and connected to the supporting surface, the at least one groove being configured for receiving a light source of an under-screen fingerprint recognition circuit,

wherein the under-screen fingerprint recognition circuit further comprises a flexible circuit board, the light source is connected to the flexible circuit board, the flexible circuit board is located outside the groove, the flexible circuit board is attached onto the inner sidewall, the light source is provided with a light-emitting surface that faces the transparent cover plate, an orthographic projection of the light-emitting surface on the flexible circuit board is located outside the flexible circuit board, and a distance between the light-emitting surface and the transparent cover plate is not greater than a distance between the flexible circuit board and the transparent cover plate.

9. The electronic device according to claim 8 , wherein the at least one groove comprises a plurality of grooves arranged at intervals.

10. The electronic device according to claim 9 , wherein the supporting frame takes the shape of a rectangular frame, and the plurality of grooves are located on a same side of the rectangular frame.

11. The electronic device according to claim 10 , wherein the plurality of grooves are symmetrically distributed about a midpoint of one side of the rectangular frame.

12. The electronic device according to claim 8 , wherein the middle frame further comprising a supporting plate configured to support a display of the electronic device and connected to the inner sidewall, wherein a light-transmitting hole configured to cooperate with a receiver of the under-screen fingerprint recognition circuit is disposed in the supporting plate.

13. The electronic device according to claim 8 , wherein the supporting frame comprises a limiting rib located on the supporting surface, and the limiting rib and the supporting surface constitute a spigot structure for limiting the transparent cover plate.

14. The electronic device according to claim 8 , wherein the light source emits light toward the transparent cover plate.

15. The electronic device according to claim 8 , further comprising a reinforcing sheet that is disposed on a surface, away from the inner sidewall, of the flexible circuit board.

16. The electronic device according to claim 14 , further comprising a light-shielding area capable of shielding visible light that is disposed at an edge of the transparent cover plate, wherein an orthographic projection of the light source on the transparent cover plate is located in the light-shielding area.

17. The electronic device according to claim 14 , further comprising a display located in a space surrounded by an inner sidewall, wherein the display is provided with a side surface opposite to the groove, and an orthographic projection of the groove on the side surface at least partially overlaps the display.