CN110767731B

CN110767731B - Display panel and display device

Info

Publication number: CN110767731B
Application number: CN201911053724.1A
Authority: CN
Inventors: 张震; 杨玉清; 崔志明
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2022-05-20
Anticipated expiration: 2039-10-31
Also published as: CN110767731A

Abstract

The embodiment of the invention provides a display panel and a display device, relates to the technical field of display, and can solve the problem that external water oxygen invades a display area. A display panel is provided with a display area and a peripheral area; the display panel includes: the display device comprises a substrate, a pixel driving circuit arranged on the substrate and positioned in a display area, and a flat layer arranged on one side, far away from the substrate, of the pixel driving circuit, wherein the flat layer is also positioned in a peripheral area; the display panel further comprises a signal line electrically connected with the pixel driving circuit, the signal line comprises a power line used for providing a power signal for the pixel driving circuit, and the power line extends into the peripheral area; the flat layer is provided with a groove on the peripheral area, and the groove is arranged around the display area; along the thickness direction of the substrate, the slots penetrate through the flat layer to expose the power line, and at least one side of the power line exposed by the slots is of a comb tooth structure.

Description

Display panel and display device

Technical Field

The invention relates to the technical field of display, in particular to a display panel and a display device.

Background

In the production process of the display panel, the packaging is a big problem at present. If the package fails, external water and oxygen can easily invade the display area, so that the luminous organic materials in the display area fail, and the display panel has undesirable phenomena such as black spots.

Disclosure of Invention

Embodiments of the present invention provide a display panel and a display device, which can improve the problem that external water and oxygen invade a display area.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, a display panel is provided, which has a display area and a peripheral area; the display panel includes: the display panel comprises a substrate, a pixel driving circuit arranged on the substrate and positioned in the display area, and a flat layer arranged on one side, far away from the substrate, of the pixel driving circuit, wherein the flat layer is also positioned in the peripheral area; the display panel further comprises a signal line electrically connected with the pixel driving circuit, the signal line comprises a power line used for providing a power signal for the pixel driving circuit, and the power line extends into the peripheral area; the flat layer is provided with a groove on the peripheral area, and the groove is arranged around the display area in a circle; along the thickness direction of the substrate, the slots penetrate through the flat layer to expose the power line, and at least one side of the power line exposed by the slots is of a comb structure.

Optionally, each side surface of the power line exposed by the slot is in a comb structure.

Optionally, for each signal line exposed by the slot, each side surface of the signal line exposed by the slot is in a comb structure.

Optionally, the display panel further includes a light emitting device electrically connected to the pixel driving circuit, and a reference ground line electrically connected to a cathode of the light emitting device; the reference ground line extends into the peripheral region; the portion of the reference ground line exposed by the slot has the same structure as the portion of the power line exposed by the slot.

Optionally, the display panel further includes a retaining wall located in the peripheral region; the comb tooth structure of the power line comprises a plurality of comb teeth which are arranged at intervals; the retaining wall is positioned on one side of the power line far away from the substrate, and the orthographic projection of the retaining wall on the substrate is not completely overlapped with the interval area between the comb teeth; and, along the extending direction of broach, with the barricade is in there is the overlap on the orthographic projection on the substrate at least one side of broach, by the barricade covers.

Or, optionally, the display panel further includes a retaining wall located in the peripheral region; the comb tooth structure of the signal line comprises a plurality of comb teeth which are arranged at intervals; the retaining wall is positioned on one side of the signal line far away from the substrate, and the orthographic projection of the retaining wall on the substrate is not completely overlapped with the interval area between the comb teeth; and, along the extending direction of broach, with the barricade is in there is the overlap on the orthographic projection on the substrate at least one side of broach, by the barricade covers.

On the basis, the retaining wall comprises a first sub-retaining wall and a second sub-retaining wall which are arranged at intervals; the first sub retaining wall is closer to the display area relative to the second sub retaining wall.

Optionally, the first sub-retaining wall and the second sub-retaining wall each include a plurality of sub-layers arranged in the thickness direction of the substrate, and the plurality of sub-layers include a first sub-layer, and the first sub-layer and the flat layer are made of the same layer and the same material.

Optionally, the power line includes a first metal layer, a second metal layer, and a third metal layer; the second metal layer is clamped between the first metal layer and the third metal layer along the thickness direction of the substrate; compared with the first metal layer and the third metal layer, the second metal layer is made of active metal.

Optionally, the display panel further includes an encapsulation layer; the packaging layer covers the display area and extends to the peripheral area; and the packaging layer covers the groove in the peripheral area.

In a second aspect, a display device is provided, which includes the display panel as described above.

The embodiment of the invention provides a display panel and a display device, which are provided with a display area and a peripheral area. The display panel includes: the display device comprises a substrate, a pixel driving circuit arranged on the substrate and positioned in a display area, and a flat layer arranged on one side, far away from the substrate, of the pixel driving circuit, wherein the flat layer is also positioned in a peripheral area. The display panel further comprises a signal line electrically connected with the pixel driving circuit, the signal line comprises a power line used for providing a power signal for the pixel driving circuit, and the power line extends into the peripheral area. The flat layer has a groove in the peripheral region, and the groove is disposed around the display region. Along the thickness direction of the substrate, the slots penetrate through the flat layer to expose the power line, and at least one side of the power line exposed by the slots is of a comb tooth structure. Compared with the power line with the flat side surface exposed by the slots, the side length of the side surface of the power line with the comb tooth structure is increased, so that the length of the power line in the slotted area is increased, and therefore, the distance of external water oxygen invading from the peripheral area to the display area through the power line is prolonged, the corrosion of the external water oxygen is slowed down, the packaging failure is avoided, and the problem of poor display caused by the invasion of the external water oxygen into the display area is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a sub-pixel region in a display panel according to an embodiment of the invention;

fig. 3 is a schematic top view of another display panel according to an embodiment of the present invention;

fig. 4 is a schematic perspective view of a display panel according to an embodiment of the present invention;

fig. 5 is a schematic top view illustrating a display panel according to another embodiment of the present invention;

fig. 6 is a schematic top view of a display panel according to the prior art;

fig. 7 is a schematic top view illustrating a display panel according to another embodiment of the present invention;

fig. 8 is a schematic top view illustrating a display panel according to another embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of the display panel of FIG. 8 along the direction C-C';

fig. 10 is a schematic top view illustrating a display panel according to another embodiment of the present invention;

FIG. 11 is a schematic cross-sectional view of the display panel of FIG. 10 along the direction D-D';

fig. 12 is a schematic top view illustrating a display panel according to another embodiment of the present invention;

fig. 13 is a schematic structural diagram of a power line according to an embodiment of the invention;

fig. 14 is a schematic structural diagram of another display panel according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a display device which comprises a display panel.

For example, the display panel may be a flexible display panel including an AMOLED (Active Matrix Organic Light Emission Diode).

As shown in fig. 1, the display panel has a display area (AA area for short) and a peripheral area S. The peripheral area S may be arranged for example one turn around the area AA.

On this basis, as shown in fig. 1, the display panel includes a substrate 10 and a pixel driving circuit 20 disposed on the substrate 10 and located in the AA region.

As shown in fig. 1, the AA region includes a plurality of subpixel regions P. Each of the sub-pixel regions P is provided with one sub-pixel, and the plurality of sub-pixel regions P includes at least a first color sub-pixel, a second color sub-pixel, and a third color sub-pixel, and the first color, the second color, and the third color are three primary colors (e.g., red, green, and blue).

For example, the plurality of sub-pixels may be arranged in a matrix form. In this case, the sub-pixels arranged in a line in the horizontal direction X are referred to as the same row of sub-pixels, and the sub-pixels arranged in a line in the vertical direction Y are referred to as the same column of sub-pixels.

In this case, the pixel driving circuit 20 may be located within the subpixel region P. The pixel driving circuit 20 generally includes electronic devices such as a Thin Film Transistor (TFT) and a capacitor (C). For example, the pixel drive circuit 20 may be a pixel drive circuit of a 2T1C structure composed of two thin film transistors (one switching transistor and one drive transistor) and one capacitor; of course, the pixel driving circuit 20 may be a pixel driving circuit 20 including two or more thin film transistors (a plurality of switching transistors and one driving transistor) and at least one capacitor.

In addition, as shown in fig. 2, a light emitting device 40 electrically connected to the pixel driving circuit 20 is further disposed in the sub-pixel region P. The light emitting device 40 includes a cathode 45 and an anode 41, and a light emitting functional layer between the cathode 45 and the anode 41. As shown in fig. 2, the light emitting function layer may include, for example, an organic light emitting layer 43, a hole transport layer 42 between the organic light emitting layer 43 and the anode 41, and an electron transport layer 44 between the organic light emitting layer 43 and the cathode 45. Of course, in some embodiments, a hole injection layer may also be disposed between the hole transport layer 42 and the anode 41, and an electron injection layer may be disposed between the electron transport layer 44 and the cathode 45, as desired.

It should be noted that fig. 2 is a schematic diagram, and does not show the connection relationship between the pixel driving circuit 20 and the light emitting device 40 (in practice, an appropriate pixel driving circuit 20 may be selected as needed).

As shown in fig. 1, the display panel further includes a signal line electrically connected to the pixel driving circuit 20, the signal line including a power supply line VDD for supplying a power supply signal to the pixel driving circuit 20. The power line VDD extends into the peripheral region S.

It is understood that the signal lines may include gate lines, data lines (not shown in fig. 1), and the like, in addition to the power supply line VDD.

On the basis, as shown in fig. 1 and fig. 2, the display panel further includes a flat layer 30 disposed on a side of the pixel driving circuit 20 away from the substrate 10, and the flat layer 30 is further located in the peripheral region S. Also, the flat layer 30 has a groove 31 in the peripheral region S, and the groove 31 is disposed around the AA region.

It is understood that, as shown in fig. 2, the planarization layer 30 is positioned between the pixel driving circuit 20 and the light emitting device 40 in the sub-pixel region P.

On this basis, the power supply line VDD is exposed through the planarization layer 30 by the trench 31 in the thickness direction of the substrate 10. As shown in fig. 3 and 4, at least one side of the power line VDD exposed by the slot 31 has a comb structure.

Note that, on the side surface of the power supply line VDD, the portion of the comb-shaped structure exposed by the slot 31 may be convex outward (as shown in fig. 3) or concave inward (as shown in fig. 5) compared to the surface of the portion covered by the flat layer 30 on the same side as the comb-shaped structure.

On this basis, the comb structure of the power supply line VDD includes a plurality of comb teeth arranged at intervals. The comb teeth are convex parts in the comb tooth structure, and the interval areas among the comb teeth are concave parts in the comb tooth structure.

Alternatively, the length of the comb teeth is 500 μm to 2000 μm in the extending direction of the comb teeth (i.e., in the horizontal direction X in fig. 3).

It should be noted that, those skilled in the art can design the number of comb teeth and the pitch of any adjacent comb teeth according to actual situations.

Illustratively, the spacing of any adjacent comb teeth may be equal.

Since the power supply line VDD exposed by the trench 31 may contact with an etching solution during a production process, for example, when the anode 41 of the light emitting device 40 is formed by a wet etching process, side corrosion may occur, and during a subsequent process of forming a film layer, the side corrosion portion may be filled with, for example, an organic material having water absorption property, so that external water oxygen may enter the AA region via the power supply line VDD according to a capillary phenomenon, resulting in a package failure.

Therefore, at least one side of the power line VDD exposed by the slot 31 in the invention is in a comb structure, that is, the surface of at least one side of the power line VDD exposed by the slot 31 is concave-convex, so that the side length of the side is increased, thereby increasing the length of the power line VDD in the area of the slot 31. On the basis, the distance of the external water oxygen invading from the peripheral area S to the AA area through the power line VDD is prolonged, so that the erosion rate of the external water oxygen can be reduced, the packaging failure is avoided, and the problem of poor display caused by the invasion of the external water oxygen into the AA area is solved.

In summary, the embodiment of the invention provides a display panel having an AA region and a peripheral region S. The display panel includes: the pixel driving circuit comprises a substrate 10, a pixel driving circuit 20 arranged on the substrate 10 and located in an AA area, and a flat layer 30 arranged on one side of the pixel driving circuit 20 far away from the substrate 10, wherein the flat layer 30 is also located in a peripheral area S. The display panel further includes signal lines electrically connected to the pixel driving circuit 20, the signal lines including a power supply line VDD for supplying a power supply signal to the pixel driving circuit 20, the power supply line VDD extending into the peripheral region S. The flat layer 30 has slots 31 in the peripheral region S, and the slots 31 are disposed around the perimeter region AA. Along the thickness direction of the substrate 10, the slots 31 penetrate through the flat layer 30 to expose the power line VDD, and at least one side of the power line VDD exposed by the slots 31 is in a comb structure. In this case, compared with the power line VDD shown in fig. 6 in which the side surface of the power line VDD exposed by the slot 31 is a flat structure, the side length of the side surface of the power line VDD in the comb structure is increased, so that the length of the power line VDD in the area of the slot 31 is increased, and therefore, the distance from the peripheral area S to the AA area through the power line VDD where external water and oxygen intrude is extended, thereby slowing down the erosion of external water and oxygen, avoiding the package failure, and improving the problem of poor display caused by the intrusion of external water and oxygen into the AA area.

On this basis, in some embodiments of the present invention, as shown in fig. 7, each side of the power line VDD exposed by the slot 31 has a comb structure.

It can be understood that the side length of each side of the power supply line VDD exposed by the slot 31 is increased, so that the length of the power supply line VDD in the area of the slot 31 is extended. On the basis, the distance of the external water oxygen from the peripheral area S to the AA area through each side surface of the power line VDD is prolonged, so that the corrosion of the external water oxygen can be slowed down.

In some embodiments of the present invention, for each signal line exposed by the slot 31, each side of the signal line exposed by the slot 31 has a comb structure.

It is understood that, for each signal line exposed by the slot 31, each side surface of the signal line exposed by the slot 31 has a comb-tooth structure, which is the same as the comb-tooth structure of the power line VDD described above.

On this basis, the side length of each side surface of the signal line exposed by the slot 31 is increased, so that the length of the signal line in the area of the slot 31 is extended. In this case, the path of the external water oxygen from the peripheral region S to the AA region is extended through each side surface of the signal line, so that the corrosion of the external water oxygen can be reduced.

In some embodiments of the present invention, the display panel further includes a light emitting device 40 electrically connected to the pixel driving circuit 20, and a reference ground line VSS electrically connected to a cathode 45 of the light emitting device 40, as shown in fig. 1, the reference ground line VSS extending to the peripheral region S.

It is understood that the potential of the signal transmitted with reference to the ground line VSS is lower than the potential of the signal transmitted by the power supply line VDD.

Here, the portion of the reference ground line VSS exposed by the slot 31 has the same structure as the portion of the power supply line VDD exposed by the slot 31.

That is, at least one side of the portion of the reference ground line VSS exposed by the slot 31 has a comb structure.

On this basis, the side length of at least one side surface of the reference ground line VSS exposed by the slot 31 is increased, so that the length of the reference ground line VSS in the area of the slot 31 is extended. At this time, the distance from the peripheral region S to the AA region through at least one side surface of the reference ground line VSS is extended, so that the corrosion by the external water and oxygen can be reduced.

Alternatively, the cathodes 45 of all the light emitting devices 40 are of a unitary structure.

In some embodiments of the invention, as shown in fig. 8 and 9, the display panel further includes a dam 60 located in the peripheral region S, and the dam 60 is located on a side of the power line VDD away from the substrate 10.

The comb structure of the power line VDD includes a plurality of comb teeth arranged at intervals, and the orthographic projection of the dam 60 on the substrate 10 and the interval region between the comb teeth do not completely overlap. At least one side of the comb teeth overlapping with the orthographic projection of the wall 60 on the substrate 10 in the extending direction of the comb teeth is covered by the wall 60.

Wherein the extending direction of the comb teeth is the projecting direction of the comb teeth (i.e., in the horizontal direction X in fig. 8).

Note that, each concave portion of the comb-shaped structure in the power supply line VDD is not completely covered by the dam 60.

Because at least one side of the comb teeth overlapped with the front projection of the retaining wall 60 on the substrate 10 is covered by the retaining wall 60 along the extending direction of the comb teeth, in the process of forming the film layer in the subsequent process, the side of the comb teeth in the comb tooth structure of the power line VDD, which is covered by the retaining wall 60, is opposite to the side which is not covered by the retaining wall 60, so that side corrosion and inward recession do not occur (as shown in fig. 9), therefore, in the process of forming the film layer in the subsequent process, the side of the comb teeth, which is covered by the retaining wall 60, is not filled with organic materials with water absorption, for example, so that when external water oxygen enters the AA region through the power line VDD, the occurrence of capillary phenomenon is avoided, and the corrosion of the water oxygen is slowed down.

In other embodiments of the present invention, the comb tooth structure of the signal line includes a plurality of comb teeth arranged at intervals.

In this case, when the display panel further includes the dam 60 located in the peripheral region S, the dam 60 is located on a side of the signal line away from the substrate 10, and the orthographic projection of the dam 60 on the substrate 10 and the spaced region between the comb teeth do not completely overlap. At least one side of the comb teeth overlapping with the orthographic projection of the wall 60 on the substrate 10 in the extending direction of the comb teeth is covered by the wall 60.

Note that the dam 60 does not completely cover each concave portion of the comb tooth structure in the signal line.

Because at least one side of the comb teeth overlapped with the orthographic projection of the retaining wall 60 on the substrate 10 is covered by the retaining wall 60 along the extending direction of the comb teeth, in the process of forming a film layer in the subsequent process, the side of the comb teeth in the comb tooth structure of the signal wire, which is covered by the retaining wall 60, is opposite to the side which is not covered by the retaining wall 60, so that side corrosion and inward recession cannot occur, in the process of forming the film layer in the subsequent process, the side, which is covered by the retaining wall 60, in the comb teeth cannot be filled with organic materials with water absorption, for example, and the occurrence of capillary phenomenon when external water oxygen enters the AA area through the signal wire is avoided, thereby slowing down the corrosion of the water oxygen.

In some embodiments of the present invention, the comb tooth structure of the reference ground line VSS includes a plurality of comb teeth arranged at intervals.

In this case, as shown in fig. 10 and 11, when the display panel further includes the banks 60 located in the peripheral region S, the banks 60 are located on a side of the reference ground line VSS away from the substrate 10, and the spaced regions between the orthogonal projections of the banks 60 on the substrate 10 and the comb teeth do not completely overlap. At least one side of the comb teeth overlapping with the orthographic projection of the wall 60 on the substrate 10 in the extending direction of the comb teeth is covered by the wall 60.

Note that the retaining wall 60 does not completely cover each concave portion of the comb tooth structure in the reference ground line VSS.

On the basis, in some embodiments of the present invention, as shown in fig. 12, the retaining wall 60 includes a first sub-retaining wall 61 and a second sub-retaining wall 62 which are arranged at intervals.

The first sub-retaining wall 61 is closer to the AA area than the second sub-retaining wall 62.

Illustratively, the interval between the first sub-retaining wall 61 and the second sub-retaining wall 62 is 30 μm to 50 μm.

It can be understood that, along the extending direction of the comb teeth, at least one side of the comb teeth overlapped with the orthographic projection of the first sub-retaining wall 61 on the substrate 10 is covered by the first sub-retaining wall 61, and at least one side of the comb teeth overlapped with the orthographic projection of the second sub-retaining wall 62 on the substrate 10 is covered by the second sub-retaining wall 62.

It should be noted that there is a distance between orthographic projections of the first sub-retaining wall 61 and the second sub-retaining wall 62 on the substrate 10, and the distance of the distance is not less than the distance between the comb teeth.

On this basis, optionally, each of the first sub-retaining wall 61 and the second sub-retaining wall 62 includes a plurality of sub-layers arranged along the thickness direction of the substrate 10, and the plurality of sub-layers includes a first sub-layer, and the first sub-layer and the flat layer 30 are made of the same material.

It is understood that during fabrication, a patterning process may be used to simultaneously form the first sub-layer and the planarization layer 30.

For example, the material of the planarization layer 30 and the first sub-layer may be an organic material including, for example, PI (Polyimide).

In some embodiments of the present invention, as shown in fig. 13, the power supply line VDD includes a first metal layer 501, a second metal layer 502, and a third metal layer 503. The second metal layer 502 is sandwiched between the first metal layer 501 and the third metal layer 503 in the thickness direction of the substrate 10. The material of the second metal layer 502 is an active metal compared to the first metal layer 501 and the third metal layer 503.

In the case that the display panel further includes the ground reference line VSS, the ground reference line VSS and the power supply line VDD are the same material in the same layer.

The first metal layer 501 and the third metal layer 503 are made of the same material.

For example, the material of the second metal layer 502 may be aluminum (Al), and the materials of the first metal layer 501 and the third metal layer 503 may be titanium (Ti).

It is understood that the second metal layer 502 is sandwiched between the first metal layer 501 and the third metal layer 503 in the thickness direction of the substrate 10, i.e., the side surfaces of the second metal layer 502 are not covered by the first metal layer 501 and the third metal layer 503.

In the subsequent process of forming the anode 41 of the light emitting device 40 by, for example, a wet etching process, in the power supply line VDD exposed in the region of the groove 31, the power supply line VDD may contact with an etching solution, and since the material of the second metal layer 502 is an active metal compared with the first metal layer 501 and the third metal layer 503, a portion of the second metal layer 502 contacting with the etching solution is more likely to undergo side corrosion compared with the first metal layer 501 and the third metal layer 503, so that a portion of the side surface of the second metal layer 502 facing inwards may form a recess. On this basis, in the process of forming a film layer such as a pixel defining layer including an organic material in a subsequent process, the recessed region of the side surface of the second metal layer 502 is filled with the organic material.

On the basis, at least one side surface of the power line VDD exposed in the groove 31 area is in a comb-tooth structure, the length of the power line VDD in the groove 31 area is increased, at the moment, due to the fact that the organic material has water absorption, in the process that external water oxygen is conveyed into the AA area through the power line VDD filled with the organic material due to capillary phenomenon, the distance of the external water oxygen conveyed into the AA area through the power line VDD is prolonged, and therefore the invasion process of the water oxygen is slowed down.

In some embodiments of the present invention, as shown in FIG. 14, the display panel further includes an encapsulation layer 70. The encapsulation layer 70 covers the AA region and extends to the peripheral region S. In the peripheral region S, the encapsulation layer 70 covers the trench 31.

It is understood that the power supply line VDD exposed in the slot 31 is covered by the encapsulation layer 70. Also, when the display panel includes the retaining wall 60, the encapsulation layer 70 also covers the retaining wall 60. The encapsulation layer 70 has a multilayer structure, and may have three or five layers, for example.

For example, in the case where the encapsulation layer 70 has a three-layer structure, the encapsulation layer 70 includes a first inorganic layer, an organic layer, and a second inorganic layer, which are sequentially disposed on the substrate 10, with the organic layer disposed therebetween. In terms of process, both the first inorganic layer and the second inorganic layer may be formed using a deposition process, and the organic layer may be formed using an inkjet printing process. On this basis, when the display panel includes the dam 60, the edge of the organic layer is located between the dam 60 and the AA region.

It is understood that the encapsulation layer 70 exposes a bonding area in the peripheral area S, and the bonding area is used for bonding an IC (Integrated Circuit) and/or an FPC (Flexible Printed Circuit), and signals can be provided to signal lines extending in the bonding area through the bonded IC and/or FPC after bonding.

In the narrow-bezel display device, the size of the peripheral region of the display panel is small, for example, the bezel on one side of the bonding region in the peripheral region is compressed, so that the effective packaging distance of the display panel is short. Therefore, at least one side of the power line VDD exposed by the slot 31 is of a comb structure, so that the distance of external water oxygen invading the AA area from the peripheral area S is prolonged, the speed of the external water oxygen invading the AA area through the power line VDD is reduced, and the problem of package failure in the reliability test process can be solved.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A display panel is characterized by comprising a display area and a peripheral area; the display panel includes: the display panel comprises a substrate, a pixel driving circuit arranged on the substrate and positioned in the display area, and a flat layer arranged on one side, far away from the substrate, of the pixel driving circuit, wherein the flat layer is also positioned in the peripheral area;

the display panel further comprises a signal line electrically connected with the pixel driving circuit and a retaining wall positioned in the peripheral area, the signal line comprises a power line used for providing a power signal for the pixel driving circuit, and the power line extends into the peripheral area;

the flat layer is provided with a groove on the peripheral area, and the groove is arranged around the display area in a circle;

along the thickness direction of the substrate, the slot penetrates through the flat layer to expose the power line, and at least one side of the power line, which is exposed by the slot, is of a comb structure; the comb tooth structure of the power line comprises a plurality of comb teeth which are arranged at intervals;

the retaining wall is positioned on one side of the power line far away from the substrate, and the orthographic projection of the retaining wall on the substrate is not completely overlapped with the interval area between the comb teeth; and, along the extending direction of broach, with the barricade is in there is the overlap on the orthographic projection on the substrate at least one side of broach, by the barricade covers.

2. The display panel according to claim 1, wherein each side of the power line exposed by the slot has a comb-tooth structure.

3. The display panel according to claim 1, wherein each side surface of the signal line exposed by the slit has a comb-tooth structure for each signal line exposed by the slit.

4. The display panel according to claim 1, further comprising a light-emitting device electrically connected to the pixel driving circuit, and a reference ground line electrically connected to a cathode of the light-emitting device; the reference ground line extends into the peripheral region;

at least one side surface of the part of the reference ground wire exposed by the slot is of a comb tooth structure.

5. The display panel according to claim 3, wherein the comb-tooth structure of the signal line includes a plurality of comb teeth arranged at intervals;

the retaining wall is also positioned on one side of the signal line far away from the substrate.

6. The display panel according to claim 1, wherein the retaining wall comprises a first retaining wall and a second retaining wall which are arranged at intervals;

the first sub retaining wall is closer to the display area relative to the second sub retaining wall.

7. The display panel according to claim 6, wherein the first sub-dam and the second sub-dam each comprise a plurality of sub-layers arranged along the thickness direction of the substrate, the plurality of sub-layers comprise a first sub-layer, and the first sub-layer and the flat layer are made of the same material.

8. The display panel according to claim 1, wherein the power supply line includes a first metal layer, a second metal layer, and a third metal layer;

the second metal layer is clamped between the first metal layer and the third metal layer along the thickness direction of the substrate;

compared with the first metal layer and the third metal layer, the second metal layer is made of active metal.

9. The display panel of claim 1, further comprising an encapsulation layer;

the packaging layer covers the display area and extends to the peripheral area; and the packaging layer covers the groove in the peripheral area.

10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.