Display panel and manufacturing method thereof, and display device

1. A display panel, comprising:

a display module, provided with an open hole penetrating through the display module in a direction perpendicular to a light-exiting face of the display module;

a shading structure, comprising a light-blocking layer on an inner wall of the open hole;

a cover plate on a light-exiting side of the display module;

a heat dissipation film on a side of the display module facing away from the cover plate; and

a shading layer on a side of the cover plate close to the display module;

wherein the heat dissipation film comprises a foam layer and a metal layer which are stacked;

the metal layer is on a side of the foam layer facing away from the display module;

the metal layer is provided with a first through hole opposite to the open hole;

an orthographic projection of the first through hole on the cover plate covers an orthographic projection of the open hole on the cover plate; and an area of the orthographic projection of the first through hole on the cover plate is greater than an area of the orthographic projection of the open hole on the cover plate;

the shading layer comprises a second through hole, and the orthographic projection of the open hole on the cover plate covers an orthographic projection of the second through hole on the cover plate;

the foam layer comprises:

a first structure part between the display module and the metal layer;

a second structure part on the inner wall of the open hole; and

a third structure part comprising:

a first end connected with an end of the second structure part close to the shading layer; and

a second end connected with the shading layer;

wherein the light-blocking layer comprises the second structure part.

2. The display panel according to claim 1 , wherein a material of the foam layer comprises a shading material.

3. The display panel according to claim 1 , wherein an area of the orthographic projection of the second through hole on the cover plate is smaller than an area of the orthographic projection of the open hole on the cover plate.

4. The display panel according to claim 1 , wherein the second structure part completely covers the inner wall of the open hole; and the first structure part, the second structure part and the third structure part are of a continuous integrated structure.

5. The display panel according to claim 4 , wherein the third structure part is provided with an arc protruding towards the shading layer.

6. The display panel according to claim 3 , wherein the open hole is a circular hole, the open hole is provided with a symmetric axis in the direction perpendicular to the light-exiting face of the display module, and a symmetric axis of the first through hole in the direction perpendicular to the light-exiting face of the display panel and a symmetric axis of the second through hole in the direction perpendicular to the light-exiting face of the display panel both coincide with the symmetric axis of the open hole.

7. The display panel according to claim 1 , further comprising:

a bonding layer on a side of the foam layer facing away from the metal layer;

wherein the foam layer is bonded to the display module through the bonding layer.

8. A method for preparing a display panel, comprising:

forming a display module;

forming an open hole penetrating through the display module in a direction perpendicular to a light-exiting face of the display module;

attaching a light-blocking layer to an inner wall of the open hole;

forming a cover plate on a light-exiting side of the display module; and

forming a shading layer on a side of the cover plate close to the display module; wherein the shading layer comprises a second through hole, and an orthographic projection of the open hole on the cover plate covers an orthographic projection of the second through hole on the cover plate;

wherein said attaching the light-blocking layer to the inner wall of the open hole, comprises:

forming a heat dissipation film on a side of the display module facing away from the cover plate, wherein the heat dissipation film comprises a foam layer and a metal layer which are stacked, the metal layer is on a side of the foam layer facing away from the display module; a first through hole is formed in the metal layer opposite to the open hole, an area of an orthographic projection of the first through hole on the cover plate is greater than an area of the orthographic projection of the open hole on the cover plate; the foam layer comprises a first structure part, a second structure part, and a third structure part; the first structure part is between the display module and the metal layer, a part in the foam layer for corresponding to the open hole forms a plurality of cutting lines distributed around a central axis of the first through hole and perpendicular to the central axis of the first through hole, so as to form the second structure part distributed around the central axis of the first through hole, and the third structure part comprises a first end connected with an end of the second structure part close to the shading layer, and a second end connected with the shading layer; and

attaching the heat dissipation film to a side of the display module facing away from the light-exiting face of the display module, wherein the first through hole of the metal layer is opposite to the open hole, so as to enable the second structure part to be bent towards the inner wall of the open hole and attached to the inner wall of the open hole, and the light-blocking layer comprises the second structure part.

9. The method according to claim 8 , wherein in a radial direction of the first through hole, and in a direction from the central axis of the first through hole to an edge of the first through hole, a length of the cutting line is greater than or equal to a thickness of the display module and smaller than a radius of the first through hole.

10. The method according to claim 9 , wherein the foam layer is provided with a third through hole, the third through hole and the first through hole are coaxially arranged, the third through hole communicates with all the cutting lines, and a diameter of the third through hole is smaller than a diameter of the open hole.

11. A display device, comprising the display panel according to claim 1 , and a shooting module in the open hole of the display module of the display panel.