Display panel and display device

Abstract

The invention provides a display panel and a display device. The display panel comprises a substrate, a first anti-cracking dam, a second anti-cracking dam and a first planarization layer, the first anti-cracking dam is located on the substrate and located in the edge area; the second anti-cracking dam is located on the substrate and extends to the edge area from the binding area, and the end, close to the edge area, of the second anti-cracking dam is located between the first anti-cracking dam and the display area; the first planarization layer is located on the sides, away from the substrate, of the first anti-cracking dam and the second anti-cracking dam, the orthographic projection of the first anti-cracking dam on the substrate is located in the orthographic projection of the first planarization layer on the substrate, and the first planarization layer comprises a first groove. The first groove is at least partially located in the side, close to the binding area, of the first anti-cracking dam and located in the side, away from the display area, of the second anti-cracking dam, and the first groove penetrates through the first planarization layer in the light emitting direction of the display panel.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] In the related art, the chip on film (COF) type display panel itself does not need to be bent. It is done by connecting the binding terminal of the display panel to one end of the COF, and then bending the other end of the COF to the back of the display panel and connecting it to the printed circuit board. Therefore, there is no need to set a bending area at the binding end of the display panel, and the side frame is directly connected to the bottom frame, which reduces the difficulty of the display panel manufacturing process. However, the rounded transition area between the side frame and the bottom frame is prone to water vapor intrusion.

[0003] The above information disclosed in this section is only for understanding the background of the inventive concept of the present disclosure and therefore the above information may contain information that does not constitute the prior art. Summary of the invention

[0004] In one aspect, a display panel is provided, the display panel comprising a display area and a peripheral area surrounding the display area, the peripheral area comprising a binding area located on one side of the display area and an edge area located on the other side of the display area, the display panel comprising a substrate, a first anti-crack dam, a second anti-crack dam and a first planarization layer; the first anti-crack dam is located on the substrate and is located in the edge area; the second anti-crack dam is located on the substrate, the second anti-crack dam extends from the binding area to the edge area, and an end of the second anti-crack dam close to the edge area is located between the first anti-crack dam and the display area; the first planarization layer is located on a side of the first anti-crack dam and the second anti-crack dam away from the substrate, the orthographic projection of the first anti-crack dam on the substrate is located within the orthographic projection of the first planarization layer on the substrate, the first planarization layer comprises a first groove, the first groove is at least partially located on the side of the first anti-crack dam close to the binding area and on the side of the second anti-crack dam away from the display area, and the first groove penetrates the first planarization layer along the light emitting direction of the display panel.

[0005] According to some exemplary embodiments, the direction from the display area to the binding area is a first direction, and the direction perpendicular to the first direction and perpendicular to the light emitting direction of the display panel is a second direction. In the second direction, the width of the first groove is greater than or equal to 30 microns.

[0006] According to some exemplary embodiments, the display panel also includes a second planarization layer, which is located on a side of the first planarization layer away from the substrate, and the orthographic projection of the second anti-crack dam on the substrate at least partially overlaps with the orthographic projection of the second planarization layer on the substrate; and the orthographic projections of the first planarization layer and the second planarization layer on the substrate located between the first anti-crack dam and the second anti-crack dam have no overlap.

[0007] According to some exemplary embodiments, an orthographic projection of the second planarization layer on the substrate has no overlap with an orthographic projection of the first groove on the substrate.

[0008] According to some exemplary embodiments, the display panel also includes a touch insulation layer, which is located on a side of the second planarization layer away from the substrate, and the orthographic projection of the first planarization layer between the first anti-crack dam and the second anti-crack dam on the substrate at least partially overlaps with the orthographic projection of the touch insulation layer on the substrate.

[0009] According to some exemplary embodiments, the display panel further includes a first barrier dam, a second barrier dam and a pixel definition layer; the first barrier dam is arranged around the display area, and the orthographic projection of the first barrier dam on the substrate is located on a side of the orthographic projection of the first anti-crack dam on the substrate close to the display area; the second barrier dam is arranged around the first barrier dam, and the orthographic projection of the second barrier dam on the substrate is located between the orthographic projection of the first anti-crack dam on the substrate and the orthographic projection of the first barrier dam on the substrate; the pixel definition layer is located on a side of the second planarization layer away from the substrate, the pixel definition layer includes a second groove located in the binding area, the second groove is located on a side of the second barrier dam away from the display area, and the second groove penetrates the pixel definition layer along the light emitting direction of the display panel.

[0010] According to some exemplary embodiments, the binding region includes a binding terminal setting area, and an orthographic projection of the binding terminal setting area on the substrate is located within an orthographic projection of the second groove on the substrate.

[0011] According to some exemplary embodiments, the display panel also includes a spacer, which is located on a side of the pixel definition layer away from the substrate; the first barrier dam includes a first dam base, a second dam base and a third dam base stacked together, and the second barrier dam includes a fourth dam base, a fifth dam base, a sixth dam base and a seventh dam base stacked together; and the first dam base and the fifth dam base are in the same layer structure as the second planarization layer, the second dam base and the sixth dam base are in the same layer structure as the pixel definition layer, the third dam base and the seventh dam base are in the same layer structure as the spacer, and the fourth dam base is in the same layer structure as the first planarization layer.

[0012] According to some exemplary embodiments, the display panel also includes a touch conductive layer, which is located on a side of the touch insulating layer away from the substrate, and the touch conductive layer includes a touch routing located in the peripheral area; the orthographic projection of the touch routing on the substrate at least partially overlaps with the orthographic projection of the first barrier dam and the second barrier dam on the substrate; and the orthographic projections of the third dam base, the fourth dam base and the seventh dam base on the substrate do not overlap with the orthographic projection of the touch routing on the substrate.

[0013] According to some exemplary embodiments, the direction from the display area to the binding area is a first direction, and on a side of the edge area close to the binding area, an end of the fourth dam base close to the binding area is located between an extension line of an end of the third dam base close to the binding area along the first direction and an end of the seventh dam base close to the binding area.

[0014] According to some exemplary embodiments, the distance between an end of the fourth dam base close to the binding area and an end of the third dam base close to the binding area along an extension line of the first direction is equal to the distance between an end of the fourth dam base close to the binding area and an end of the seventh dam base close to the binding area.

[0015] According to some exemplary embodiments, a distance between an extension line of one end of the third dam close to the binding area along the first direction and one end of the seventh dam close to the binding area is greater than or equal to 300 micrometers and less than or equal to 400 micrometers.

[0016] According to some exemplary embodiments, a direction from the display area to the binding area is a first direction, and in the first direction, a width of the fourth dam is smaller than a width of the seventh dam.

[0017] According to some exemplary embodiments, in the light emitting direction of the display panel, the thicknesses of the first dam and the fifth dam first increase and then decrease along the direction from the display area to the binding area.

[0018] In another aspect, a display device is provided. The display device includes a chip-on-film and the display panel as described above, wherein the chip-on-film is electrically connected to the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other objects and advantages of the present disclosure will be apparent from the following description of the present disclosure with reference to the accompanying drawings, and will help to have a comprehensive understanding of the present disclosure.

[0020] Figure 1 A schematic plan view of a display panel according to some embodiments of the present disclosure is schematically shown.

[0021] Figure 2 Schematically shows the first planarization layer according to some embodiments of the present disclosure Figure 1 Schematic diagram of the membrane layer boundary in the P1 region.

[0022] Figure 3 Schematically shows Figure 2 Magnified view of the P2 region.

[0023] Figure 4 Schematically shows the second planarization layer according to some embodiments of the present disclosure Figure 1 Schematic diagram of the membrane layer boundary in the P1 region.

[0024] Figure 5 Schematically shows Figure 4 A magnified view of the P3 region.

[0025] Figure 6 Schematically showing a portion of the film layer of a display panel according to some embodiments of the present disclosure Figure 1 Magnified view of the P4 region.

[0026] Figure 7 Schematically shows Figure 6 Magnified view of the P5 region.

[0027] Figure 8 Schematically shows the Figure 2 Cross-sectional view along the A-A' direction.

[0028] Fig. 9 Schematically shows the Figure 7 Cross-sectional view along the B-B' direction.

[0029] Fig.10 Schematically shows the pixel definition layer according to some embodiments of the present disclosure. Figure 1 Schematic diagram of the membrane layer boundary in the P1 region.

[0030] Fig.11 Schematically shows Fig.10 Magnified view of the P6 region.

[0031] Fig.12 Schematically shows Fig.10 Magnified view of the P7 region.

[0032] Fig.13 Schematically shows the Fig.12 Cross-sectional view along the C-C' direction.

[0033] Fig.14 Schematically shows the Fig.12 Cross-sectional view along the D-D' direction.

[0034] Fig.15 Schematically shows the touch routing according to some embodiments of the present disclosure. Figure 1 Schematic diagram of the wiring in the P1 area.

[0035] Fig.16 Schematically shows Fig.15 Magnified view of the P8 region.

[0036] Fig.17 Schematically shows the Fig.16 Cross-sectional view along the E-E' direction.

[0037] Fig.18 Schematically shows a display panel according to some embodiments of the present disclosure Figure 2 Cross-sectional view along the F-F' direction.

[0038] Fig.19 A schematic plan view of a display device according to some embodiments of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0039] In the following description, for the purpose of explanation, many specific details are set forth to provide a comprehensive understanding of various exemplary embodiments. However, it is apparent that various exemplary embodiments may be implemented without these specific details or with one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, the specific shapes, configurations, and characteristics of an exemplary embodiment may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0040] In the accompanying drawings, the size and relative size of the elements may be exaggerated for the purpose of clarity and / or description. Thus, the size and relative size of each element are not necessarily limited to the size and relative size shown in the drawings. In addition, the same reference numerals represent the same elements.

[0041] When an element is described as being "on" another element, "connected to" another element, or "coupled to" another element, the element may be directly on, directly connected to, or directly coupled to another element, or there may be intervening elements. However, when an element is described as being "directly on", "directly connected to", or "directly coupled to" another element, there are no intervening elements. Other terms and / or expressions used to describe the relationship between elements should be interpreted in a similar manner, for example, "between" versus "directly between", "adjacent" versus "directly adjacent", or "on" versus "directly on", etc. In addition, the term "connected" may refer to a physical connection, an electrical connection, a communication connection, and / or a fluid connection.

[0042] It should be understood that, although the terms first, second, etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the exemplary embodiment, the first element may be named as the second element, and similarly, the second element may be named as the first element.

[0043] In the related art, since the COF display panel itself does not need to be bent, there is no need to set a bending area at the binding end of the display panel, and the side frame is directly connected to the bottom frame, but the rounded transition area where the side frame and the bottom frame are connected is prone to water vapor intrusion. Therefore, in order to solve at least one aspect of the above technical problems, the embodiments of the present disclosure provide a display panel and a display device, which are conducive to preventing water and oxygen intrusion in the rounded transition area.

[0044] Figure 1 is a schematic plan view of a display panel 100 according to some embodiments of the present disclosure. Figure 2 According to some embodiments of the present disclosure, the first planarization layer 40 is Figure 1 Schematic diagram of the membrane layer boundary in the P1 region. Figure 3 yes Figure 2 Magnified view of the P2 region. Figure 4 According to some embodiments of the present disclosure, the second planarization layer 50 is Figure 1 Schematic diagram of the membrane layer boundary in the P1 region. Figure 5 yes Figure 4 A magnified view of the P3 region. Figure 6 According to some embodiments of the present disclosure, part of the film layer of the display panel 100 is Figure 1 Magnified view of the P4 region. Figure 7 yes Figure 6 Magnified view of the P5 region. Figure 8 is along Figure 2 Cross-sectional view along the A-A' direction. Fig. 9 is along Figure 7 Cross-sectional view along the B-B' direction.

[0045] Reference Figures 1 to 9 The display panel 100 includes a display area A1 and a peripheral area A2 surrounding the display area A1, wherein the peripheral area A2 includes a binding area A21 located on one side of the display area A1 and an edge area A22 located on the other side of the display area A1. Figure 1 The binding area A21 is located at the lower frame of the display panel 100 as an example, but the embodiments of the present disclosure are not limited thereto. The binding area A21 is used to set a plurality of binding terminals to achieve connection with the flip chip film 300 (refer to Fig.19 ) is electrically connected to transmit the display driving signal through the COF 300. Exemplarily, the edge area A22 is located at the upper, left and right frames of the display panel 100.

[0046] Reference Figure 2 , Figure 3 and Fig. 9 The display panel 100 includes a substrate 10, a first crack prevention dam 20, a second crack prevention dam 30, and a first planarization layer 40. The first crack prevention dam 20 is located on the substrate 10 and is located in the edge area A22. For example, the first crack prevention dam 20 is located at the upper, left, and right frames of the display panel 100. The second crack prevention dam 30 is located on the substrate 10, and the second crack prevention dam 30 extends from the binding area A21 to the edge area A22. One end of the second crack prevention dam 30 close to the edge area A22 is located between the first crack prevention dam 20 and the display area A1.

[0047] The first planarization layer 40 is located on the side of the first crack prevention dam 20 and the second crack prevention dam 30 away from the substrate 10, and the orthographic projection of the first crack prevention dam 20 on the substrate 10 is located within the orthographic projection of the first planarization layer 40 on the substrate 10, that is, the first crack prevention dam 20 is covered by the first planarization layer 40. The first planarization layer 40 includes a first groove 401, and the first groove 401 is at least partially located on the side of the first crack prevention dam 20 close to the binding area A21 and on the side of the second crack prevention dam 30 away from the display area A1, and the first groove 401 penetrates the first planarization layer 40 along the light emitting direction of the display panel 100. Specifically, in combination with reference Figure 2 and Figure 3 The direction from the display area A1 to the binding area A21 is the first direction X, which is perpendicular to the first direction X and perpendicular to the light emitting direction Z of the display panel 100 (refer to Fig.17) is the second direction Y; in the second direction Y, the first groove 401 is located on the side of the first anti-crack dam 20 close to the binding area A21; in the first direction X, the orthographic projection of a part of the first groove 401 on the substrate 10 overlaps with the orthographic projection of the second anti-crack dam 30 on the substrate 10, and another part of the first groove 401 is located on the side of the second anti-crack dam 30 away from the display area A1, that is, the first planarization layer 40 at least excavates a part located on the side of the first anti-crack dam 20 close to the binding area A21 and on the side of the second anti-crack dam 30 away from the display area A1 (that is, the rounded transition area).

[0048] It should be noted that the display panel 100 is obtained by cutting a motherboard into small panels. Figure 1 As shown, the film layer boundary CL of the display panel 100 corresponds to the cutting track. In this embodiment, the first crack prevention dam 20 and the second crack prevention dam 30 are provided to reduce the cutting stress and prevent the cracks generated during the cutting process from being transmitted to the display area A1, causing the package failure. That is, the first crack prevention dam 20 and the second crack prevention dam 30 play a role in protecting the display panel 100 in the peripheral area A2.

[0049] It can be understood that since the binding area A21 of the display panel 100 requires routing, the first anti-crack dam 20 is only arranged around the edge area A22 of the display panel 100, that is, around the left frame, upper frame and right frame of the display panel 100, and the two ends of the first anti-crack dam 20 (that is, the cut-off position of the first anti-crack dam 20) are respectively located at the boundary of the edge area A22 close to the binding area A21.

[0050] It can be understood that since the rounded transition zone between the edge area A22 and the binding area A21 needs to be cut in an arc shape and the stress is relatively large, a second anti-crack dam 30 is set, and the end of the second anti-crack dam 30 close to the edge area A22 is located between the first anti-crack dam 20 and the display area A1, thereby forming double protection in the rounded transition zone.

[0051] For example, in conjunction with reference Figure 3 and Fig. 9 In some embodiments, the display panel 100 includes a first inorganic layer IL1 on a substrate 10, and the first crack prevention dam 20 and the second crack prevention dam 30 include a groove V disposed in the first inorganic layer IL1. It can be understood that since most cracks are generated in the inorganic layer under stress and diffuse and spread along the inorganic layer, etching a portion of the inorganic layer (e.g., the first inorganic layer IL1), for example, to form a plurality of grooves V, can effectively prevent the cracks from extending to the display area A1. In some embodiments, the first inorganic layer IL1 can be disposed in the same layer as at least one (e.g., all) of the first gate insulating layer, the second gate insulating layer, and the interlayer insulating layer.

[0052] It should be noted that, since the binding area A21 of the display panel 100 needs to be wired, the second anti-crack dam 30 is only provided at the boundary of the binding area A21 close to the edge area A22, that is, at both ends of the binding area A21. Figure 2 As shown, the display panel 100 includes two second anti-crack dams 30, which are respectively arranged at the left and right ends of the lower frame of the display panel 100 to protect the two rounded transition areas of the lower frame. The area between the two second anti-crack dams 30 is used for routing to avoid the groove V on the second anti-crack dam 30 affecting the routing. The second anti-crack dam 30 on the left is used as an example for explanation below, and the second anti-crack dam 30 on the right is similar in structure to the second anti-crack dam 30 on the left.

[0053] It should be noted that, in this embodiment, by providing a first planarization layer 40 on the side of the first anti-crack dam 20 and the second anti-crack dam 30 away from the substrate 10, and using the first planarization layer 40 to cover the first anti-crack dam 20, not only can the risk of detachment between the first inorganic layer IL1 and the substrate 10 be reduced, but also the first anti-crack dam 20 and the second anti-crack dam 30 can be protected, thereby improving the stability of the display panel 100.

[0054] Reference Figure 2 and Figure 3 , the dot-dash line indicates the film layer boundary of the first planarization layer 40, Figure 2 In the figure, the first dot-dash line L11, the second dot-dash line L12, the third dot-dash line L13 and the fourth dot-dash line L14 are included. The first dot-dash line L11 is located on the side of the display area A1 close to the binding area A21, and the first planarization layer 40 located on the side of the first dot-dash line L11 close to the display area A1 is retained. The second dot-dash line L12 is a rectangular dot-dash frame located in the binding area A21, and the first planarization layer 40 located in the rectangular dot-dash frame is retained. The third dot-dash line L13 and the fourth dot-dash line L14 are both located in the edge area A22, and the first planarization layer 40 located on the side of the third dot-dash line L13 and the fourth dot-dash line L14 close to the first anti-crack dam 20 is retained. Specifically, the third dotted line L13 and the fourth dotted line L14 are two segments of the same dotted line (for example, an edge dotted line), and the edge dotted line is located on the side of the first anti-crack dam 20 close to the display area A1. The first planarization layer 40 located on the side of the edge dotted line close to the first anti-crack dam 20 is retained to cover the first anti-crack dam 20.

[0055] Continue to refer to Figure 2 and Figure 3, the area below the first dotted line L11, outside the rectangular dotted line frame where the second dotted line L12 is located, and on the side of the third dotted line L13 and the fourth dotted line L14 away from the first anti-crack dam 20 is the removed area B1 of the first planarization layer 40. The display panel 100 further includes a first barrier dam D1 and a second barrier dam D2. Part of the first planarization layer 40 can be retained in the second barrier dam D2 located in the removed area B1. Specifically, from Figure 2 and Figure 3 It can be seen that the first anti-crack dam 20 is covered by the first planarization layer 40, and part of the second anti-crack dam 30 is covered by the first planarization layer 40. The first planarization layer 40 includes a first groove 401 located in the excavated area B1. In the second direction Y, the first groove 401 is located on the side of the first anti-crack dam 20 close to the binding area A21, and in the first direction X, the orthographic projection of a part of the first groove 401 on the substrate 10 overlaps with the orthographic projection of the second anti-crack dam 30 on the substrate 10, and another part of the first groove 401 is located on the side of the second anti-crack dam 30 away from the display area A1. The first groove 401 is along the light emitting direction Z of the display panel 100 (refer to Fig.17 ) penetrates the first planarization layer 40, that is, at least the first planarization layer 40 located at the connection between the side frame and the lower frame of the display panel 100 (rounded corner transition area) is dug out, which can prevent the intrusion of water and oxygen in the rounded corner transition area and improve the packaging performance of the display panel 100.

[0056] In some embodiments of the present disclosure, referring to Figure 1 and Figure 3 The direction from the display area A1 to the binding area A21 is the first direction X, which is perpendicular to the first direction X and perpendicular to the light emitting direction Z of the display panel 100 (refer to Fig.17 ) is the second direction Y. In the second direction Y, the width w1 of the first groove 401 is greater than or equal to 30 micrometers, for example, the width w1 of the first groove 401 is any value between 30 micrometers, 32 micrometers, 35 micrometers, 37 micrometers, and 40 micrometers.

[0057] The inventors have found that if the width w1 of the first groove 401 is less than 30 microns in the second direction Y, after the metal material is subsequently deposited on the side of the first planarization layer 40 away from the substrate 10 (for example, to form the second source and drain SD2), the metal material deposited in the first groove 401 is likely to remain due to the small width w1 of the first groove 401, which will affect the subsequent film deposition. In this embodiment, by setting the width w1 of the first groove 401 to be greater than or equal to 30 microns, the metal material in the first groove 401 is easier to remove, reducing the risk of residue.

[0058] In some embodiments of the present disclosure, referring to Figures 4 to 9The display panel 100 further includes a second planarization layer 50, and the second planarization layer 50 is located on a side of the first planarization layer 40 away from the substrate 10. Figure 4 and Figure 5 , and the dotted line indicates the film layer boundary of the second planarization layer 50. Figure 4 , including a first dotted line L21, a second dotted line L22 and a third dotted line L23. The first dotted line L21 and the second dotted line L22 are respectively located on the side of the display area A1 close to the edge area A22, and the second planarization layer 50 located on the side of the first dotted line L21 and the second dotted line L22 close to the display area A1 is retained. The third dotted line L23 is located in the binding area A21 and the edge area A22, and the second planarization layer 50 located on the side of the third dotted line L23 away from the first anti-crack dam 20 is retained.

[0059] Continue to refer to Figure 4 and Figure 5 , the area located on the side of the first dotted line L21 and the second dotted line L22 away from the display area A1, and the area located on the side of the third dotted line L23 close to the first anti-crack dam 20 is the excavated area B2 of the second planarization layer 50. The display panel 100 further includes a first barrier dam D1 and a second barrier dam D2, and the second planarization layer 50 can be retained in the first barrier dam D1 and the second barrier dam D2 located in the excavated area B2. Specifically, Figure 4 and Figure 5 It can be seen that the first anti-crack dam 20 is located outside the film layer boundary of the second planarization layer 50, and part of the second anti-crack dam 30 is covered by the second planarization layer 50, that is, the orthographic projection of the first anti-crack dam 20 on the substrate 10 does not overlap with the orthographic projection of the second planarization layer 50 on the substrate 10, and the orthographic projection of the second anti-crack dam 30 on the substrate 10 at least partially overlaps with the orthographic projection of the second planarization layer 50 on the substrate 10.

[0060] Reference Figure 6 , Figure 7 and Fig. 9 The dotted line indicates the film boundary of the first planarization layer 40, and the excavated area B1 of the first planarization layer 40 is shown in FIG. Figure 2 The dotted line indicates the film boundary of the second planarization layer 50, and the excavated area B2 of the second planarization layer 50 is referenced to Figure 4 The first planarization layer 40 and the second planarization layer 50 located between the first anti-crack dam 20 and the second anti-crack dam 30 have no overlap in their orthographic projections on the substrate 10. That is, the first anti-crack dam 20 is covered by the first planarization layer 40, and the portion of the second anti-crack dam 30 close to the first anti-crack dam 20 is covered by the second planarization layer 50.

[0061] It should be noted that in the related art, both the first planarization layer 40 and the second planarization layer 50 are used to cover the second anti-crack dam 30, resulting in a large step difference between the first anti-crack dam 20 and the second anti-crack dam 30, which makes it easy to generate bubbles when the film layer is subsequently made on the side of the second planarization layer 50 away from the substrate 10. It can be understood that in this embodiment, the second planarization layer 50 is used to cover the part of the second anti-crack dam 30 close to the first anti-crack dam 20, and the first planarization layer 40 is used to cover the first anti-crack dam 20, which can effectively reduce the step difference between the first anti-crack dam 20 and the second anti-crack dam 30, thereby reducing the probability of bubbles, and avoiding affecting the subsequent film layer made on the side of the second planarization layer 50 away from the substrate 10.

[0062] Reference Figure 6 and Figure 7 In some embodiments of the present disclosure, the orthographic projection of the second planarization layer 50 on the substrate 10 does not overlap with the orthographic projection of the first groove 401 on the substrate 10, that is, the second planarization layer 50 in the area where the first groove 401 is located is also dug out, so that the water and oxygen intrusion in the rounded transition area can be further prevented, and the packaging performance of the display panel 100 is improved. It should be noted that all organic materials located in the area where the first groove 401 is located can also be dug out to better prevent the water and oxygen intrusion.

[0063] Reference Figure 8 and Fig. 9 In some embodiments of the present disclosure, the display panel 100 further includes a touch insulating layer IL3, and the touch insulating layer IL3 is located on a side of the second planarization layer 50 away from the substrate 10. Fig. 9 As shown, the orthographic projection of the first planarization layer 40 between the first crack prevention dam 20 and the second crack prevention dam 30 on the substrate 10 at least partially overlaps with the orthographic projection of the touch insulating layer IL3 on the substrate 10. That is, the touch insulating layer IL3 covers the end of the first planarization layer 40 between the first crack prevention dam 20 and the second crack prevention dam 30 close to the second planarization layer 50, which can reduce the risk of separation between the first planarization layer 40 and the substrate 10 and improve the packaging effect of the display panel 100.

[0064] In some embodiments of the present disclosure, the display panel 100 further includes a bridge layer and a touch conductive layer 80 (see Fig.18 ), the bridge layer is located between the touch insulating layer IL3 and the substrate 10, the touch conductive layer 80 is located on the side of the touch insulating layer IL3 away from the substrate 10, and the touch conductive layer 80 includes touch electrodes 803 and touch traces 801 electrically connected to the touch electrodes 803. Among them, adjacent touch electrodes 803 can be electrically connected through the bridge layer.

[0065] Reference Figure 6In some embodiments of the present disclosure, the second crack prevention dam 30 includes a first area Z1 and a second area Z2. The first area Z1 is used to set a groove V to prevent the crack from extending to the display area A1, and the second area Z2 is not provided with a groove V. Specifically, the second area Z2 can be used to set a metal material, so the groove V is not set in the second area Z2 to avoid affecting the metal material.

[0066] Reference Figure 2 , Figure 4 and Figure 6 In some embodiments of the present disclosure, the first barrier dam D1 is disposed around the display area A1, and the orthographic projection of the first barrier dam D1 on the substrate 10 is located on a side of the orthographic projection of the first crack prevention dam 20 on the substrate 10 close to the display area A1. The second barrier dam D2 is disposed around the first barrier dam D1, and the orthographic projection of the second barrier dam D2 on the substrate 10 is located between the orthographic projection of the first crack prevention dam 20 on the substrate 10 and the orthographic projection of the first barrier dam D1 on the substrate 10.

[0067] It should be noted that the first barrier dam D1 and the second barrier dam D2 are both used to block the inkjet printing (IJP) material to prevent the IJP material from overflowing. In some embodiments, the height of the second barrier dam D2 relative to the substrate 10 can be greater than the height of the first barrier dam D1 relative to the substrate 10, so that multiple blocking effects can be achieved to improve the blocking effect.

[0068] Fig.10 According to some embodiments of the present disclosure, the pixel definition layer 60 is Figure 1 Schematic diagram of the membrane layer boundary in the P1 region. Fig.11 yes Fig.10 Magnified view of the P6 region. Fig.12 yes Fig.10 Magnified view of the P7 region. Fig.13 is along Fig.12 Cross-sectional view along the C-C' direction. Fig.14 is along Fig.12 Cross-sectional view along the D-D' direction. Fig.15 According to some embodiments of the present disclosure, the touch line 801 is Figure 1 Schematic diagram of the wiring in the P1 area. Fig.16 yes Fig.15 Magnified view of the P8 region. Fig.17 is along Fig.16 Cross-sectional view along the E-E' direction.

[0069] In some embodiments of the present disclosure, the display panel 100 further includes a pixel definition layer 60, which is located on a side of the second planarization layer 50 away from the substrate 10 (see Figure 8 ). Specifically, refer to Fig.10 and Fig.11 , the dotted line L3 represents the film layer boundary of the pixel definition layer 60, the area outside the dotted line L3 is the excavated area B3 of the pixel definition layer 60, the excavated area B3 of the pixel definition layer 60 is the second groove 501, the second groove 501 is located in the binding area A21, the second groove 501 is located on the side of the second barrier dam D2 away from the display area A1, and the second groove 501 is along the light emitting direction Z of the display panel 100 (refer to Fig.17 ) runs through the pixel definition layer 60.

[0070] It can be understood that since the side of the second barrier dam D2 away from the display area A1 does not need to cover the pixel definition layer 60, part of the pixel definition layer 60 can be dug out on the side of the second barrier dam D2 away from the display area A1 (for example, to form a second groove 501), thereby reducing the intrusion of water vapor and reducing the step difference of the film layer, so that the signal line located on the side of the pixel definition layer 60 away from the substrate 10 is not easily disconnected.

[0071] Reference Fig.10 In some embodiments of the present disclosure, the binding area A21 includes a binding terminal setting area A210, and the binding terminal setting area A210 is used to set a plurality of binding terminals, through which the plurality of binding terminals are connected to the flip chip film 300 (refer to Fig.19 The positive projection of the binding terminal setting area A210 on the substrate 10 is located within the positive projection of the second groove 501 on the substrate 10, that is, the pixel definition layer 60 in the binding terminal setting area A210 is dug out, which can reduce the step difference between water vapor and the film layer.

[0072] Reference Fig.10 , Figure 12 to Figure 14 In some embodiments of the present disclosure, the display panel 100 further includes a spacer 70, which is located on the side of the pixel definition layer 60 away from the substrate 10. The spacer 70 can play the role of a spacer and a support, for example, supporting devices such as a mask plate that may be used in the preparation process. The first barrier dam D1 includes a first dam base D11, a second dam base D12, and a third dam base D13 stacked together, and the second barrier dam D2 includes a fourth dam base D21, a fifth dam base D22, a sixth dam base D23, and a seventh dam base D24 stacked together. Among them, the first dam base D11 and the fifth dam base D22 are in the same layer structure as the second planarization layer 50, the second dam base D12 and the sixth dam base D23 are in the same layer structure as the pixel definition layer 60, the third dam base D13 and the seventh dam base D24 are in the same layer structure as the spacer 70, and the fourth dam base D21 is in the same layer structure as the first planarization layer 40.

[0073] It should be noted that the first dam base D11 and the fifth dam base D22 are in the same layer structure with the second planarization layer 50, which means that the first dam base D11 and the fifth dam base D22 are formed with the second planarization layer 50 using the same process. The second dam base D12 and the sixth dam base D23 are in the same layer structure with the pixel definition layer 60, which means that the second dam base D12 and the sixth dam base D23 are formed with the pixel definition layer 60 using the same process. The third dam base D13 and the seventh dam base D24 are in the same layer structure with the spacer 70, which means that the third dam base D13 and the seventh dam base D24 are formed with the spacer 70 using the same process. The fourth dam base D21 is in the same layer structure with the first planarization layer 40, which means that the fourth dam base D21 is formed with the first planarization layer 40 using the same process. Therefore, the manufacturing process of the display panel 100 can be simplified.

[0074] It can be understood that since there is a fourth dam base D21 prepared in the same layer as the first planarization layer 40 in the second barrier dam D2, the height of the second barrier dam D2 relative to the substrate 10 can be greater than the height of the first barrier dam D1 relative to the substrate 10, thereby playing a multiple blocking role to improve the blocking effect.

[0075] Reference Figures 15 to 17 In some embodiments of the present disclosure, the display panel 100 further includes a touch conductive layer 80, the touch conductive layer 80 is located on a side of the touch insulating layer IL3 away from the substrate 10, and the touch conductive layer 80 includes a touch trace 801 located in the peripheral area A2. The orthographic projection of the touch trace 801 on the substrate 10 at least partially overlaps with the orthographic projection of the first barrier dam D1 and the second barrier dam D2 on the substrate 10. Specifically, referring to Fig.15 Since the touch line 801 is used to connect the touch electrode 803 in the display area A1 (refer to Fig.18 ) and the binding terminals outside the display area A1, so the touch wiring 801 needs to cross the first barrier dam D1 and the second barrier dam D2.

[0076] Reference Fig.10 , Fig.12 and Fig.14 , the film layer boundaries of the third dam base D13 of the first barrier dam D1, the fourth dam base D21 and the seventh dam base D24 of the second barrier dam D2 are all located at the connection between the side frame and the lower frame, that is, the orthographic projection of the third dam base D13, the fourth dam base D21 and the seventh dam base D24 on the substrate 10 does not overlap with the orthographic projection of the touch wiring 801 on the substrate 10. Therefore, referring to Fig.17The touch line 801 only needs to cross the first dam base D11 and the second dam base D12 of the first barrier dam D1, and the fifth dam base D22 and the sixth dam base D23 of the second barrier dam D2, which reduces the climbing difficulty of the touch line 801, avoids the touch line 801 from being disconnected, and avoids the signal from being open.

[0077] Continue to refer to Fig.10 and Fig.12 In some embodiments of the present disclosure, the direction from the display area A1 to the binding area A21 is the first direction X, and on the side of the edge area A22 close to the binding area A21, an end of the fourth dam D21 close to the binding area A21 is located between an extension line L4 along the first direction of an end of the third dam D13 close to the binding area A21 and an end of the seventh dam D24 close to the binding area A21.

[0078] It is understandable that, since the binding area A21 needs to be provided with a signal line, the membrane layer boundaries of the third dam base D13, the fourth dam base D21 and the seventh dam base D24 are set at the connection between the side frame and the lower frame to reduce the membrane layer step difference of the binding area A21, which is beneficial to the signal line climbing. In this embodiment, by setting the membrane layer boundary of the fourth dam base D21 between the extension line L4 of the membrane layer boundary of the third dam base D13 and the membrane layer boundary of the seventh dam base D24, the membrane layer step difference between the first barrier dam D1 and the second barrier dam D2 can be reduced.

[0079] In some embodiments of the present disclosure, the distance w2 between one end of the fourth dam base D21 close to the binding area A21 and one end of the third dam base D13 close to the binding area A21 along the extension line L4 in the first direction is equal to the distance w3 between one end of the fourth dam base D21 close to the binding area A21 and one end of the seventh dam base D24 close to the binding area A21. That is, the membrane layer boundary of the fourth dam base D21 is located in the middle of the extension line L4 of the membrane layer boundary of the third dam base D13 and the membrane layer boundary of the seventh dam base D24, which can achieve a better step transition effect and reduce the membrane layer step difference between the first barrier dam D1 and the second barrier dam D2, but the embodiments of the present disclosure are not limited thereto.

[0080] Continue to refer to Fig.12 In some embodiments of the present disclosure, a distance (w2+w3) between an end of the third dam base D13 close to the binding area A21 along an extension line L4 in the first direction and an end of the seventh dam base D24 close to the binding area A21 is greater than or equal to 300 microns and less than or equal to 400 microns. For example, a distance (w2+w3) between an end of the third dam base D13 close to the binding area A21 along an extension line L4 in the first direction and an end of the seventh dam base D24 close to the binding area A21 is any one of 300 microns, 320 microns, 350 microns, 380 microns, and 400 microns.

[0081] In some embodiments of the present disclosure, the direction from the display area A1 to the binding area A21 is the first direction X. In the first direction X, the width w4 of the fourth dam base D21 is smaller than the width w5 of the seventh dam base D24. It can be understood that by setting the width w4 of the fourth dam base D21 to be smaller than the width w5 of the seventh dam base D24, the step difference of the film layer of the second barrier dam D2 can be reduced.

[0082] It should be noted that Fig.12 Only one end of the third dam base D13, the fourth dam base D21 and the seventh dam base D24 is shown to be located between the left frame and the lower frame. The other ends of the third dam base D13, the fourth dam base D21 and the seventh dam base D24 can be respectively Fig.12 The film layer boundaries in the display panel 100 are symmetrically arranged about the central axis of the display panel 100 along the first direction X. That is, the film layer boundaries at the other ends of the third dam base D13, the fourth dam base D21 and the seventh dam base D24 are located between the right frame and the lower frame. The first dam base D11, the second dam base D12, the fifth dam base D22 and the sixth dam base D23 are all arranged around the display area A1.

[0083] Reference Fig.16 In some embodiments of the present disclosure, a plurality of dummy wirings 802 are further provided on one side of the touch wiring 801 close to the first barrier dam D1 to prevent the touch wiring 801 from being interfered by other signal lines.

[0084] Reference Fig.17 In some embodiments of the present disclosure, in the light emitting direction Z of the display panel 100, the thicknesses (h1, h2) of the first dam base D11 and the fifth dam base D22 increase first and then decrease along the direction from the display area A1 to the binding area A21 (i.e., the first direction X). It can be understood that in this embodiment, by making the thicknesses (h1, h2) of the first dam base D11 and the fifth dam base D22 increase first and then decrease along the first direction X, the step difference of the film layer between the first barrier dam D1 and the second barrier dam D2 can be reduced, which is beneficial for the touch line 801 to climb, and can avoid the touch line 801 from being disconnected, and avoid the signal open circuit.

[0085] Fig.18 The display panel 100 according to some embodiments of the present disclosure is Figure 2 Cross-sectional view along the F-F' direction.

[0086] Reference Fig.18 In some embodiments of the present disclosure, the display panel 100 includes a substrate 10, a first conductive layer 2, a first planarization layer 40, a second conductive layer 3, a second planarization layer 50, a pixel definition layer 60, a light-emitting layer 4, a cathode layer 5, a thin film encapsulation layer 6, a touch insulating layer IL3, a touch conductive layer 80, a touch protection layer IL4 and a polarizing layer 7 which are stacked in sequence.

[0087] The substrate 10 and the first conductive layer 2 may further include a first inorganic layer IL1 and a passivation layer IL2 (see Figure 8 ). The first conductive layer 2 may include a first source-drain electrode (SD1) and a power supply voltage signal line (VDD). The second conductive layer 3 may include a second source-drain electrode (SD2), and the second source-drain electrode (SD2) is used to electrically connect the first source electrode or the first drain electrode to the anode. The pixel definition layer 60 includes a plurality of sub-pixel openings, and the sub-pixel openings are used to expose the anode and define the light-emitting area of ​​the sub-pixel. The light-emitting layer 4 is located in the sub-pixel opening. The cathode layer 5 is located on the side of the light-emitting layer 4 away from the substrate 10.

[0088] The thin film encapsulation layer 6 includes a first inorganic encapsulation layer 601, an organic encapsulation layer 602 and a second inorganic encapsulation layer 603. The first inorganic encapsulation layer 601 is located on the side of the cathode layer 5 away from the substrate 10, the organic encapsulation layer 602 (for example, an IJP material) is located on the side of the first inorganic encapsulation layer 601 away from the substrate 10, and the second inorganic encapsulation layer 603 is located on the side of the organic encapsulation layer 602 away from the substrate 10.

[0089] The touch insulating layer IL3 is located on the side of the thin film encapsulation layer 6 away from the substrate 10. The touch conductive layer 80 includes a touch electrode 803 and a touch trace 801 electrically connected to the touch electrode 803. The touch protection layer IL4 is located on the side of the touch conductive layer 80 away from the substrate 10, and is used to protect the touch electrode 803 and the touch trace 801.

[0090] The polarizing layer 7 is located on a side of the touch protection layer IL4 away from the substrate 10 , and is used to eliminate reflection of external ambient light to maintain high contrast and clarity of the display panel 100 .

[0091] Fig.19 is a schematic plan view of a display device 200 according to some embodiments of the present disclosure.

[0092] Reference Fig.19 The display device 200 includes a COF 300 and the display panel 100 as described above. The COF 300 is electrically connected to the display panel 100. For a detailed structure of the display panel 100, please refer to Figures 1 to 18 The display device 200 disclosed in the present invention can be used in the fields of mobile phones, tablet computers, notebooks, monitors, and vehicle-mounted displays.

[0093] Although some embodiments according to the general inventive concept of the present disclosure have been illustrated and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A display panel, characterized in that: The display panel includes a display area and a peripheral area surrounding the display area, the peripheral area includes a binding area located on one side of the display area and an edge area located on the other side of the display area, and the display panel includes: substrate; A first crack prevention dam is located on the substrate and in the edge region; a second crack prevention dam, located on the substrate, the second crack prevention dam extending from the binding area to the edge area, and an end of the second crack prevention dam close to the edge area is located between the first crack prevention dam and the display area; and A first planarization layer is located on a side of the first anti-crack dam and the second anti-crack dam away from the substrate, the orthographic projection of the first anti-crack dam on the substrate is located within the orthographic projection of the first planarization layer on the substrate, the first planarization layer includes a first groove, the first groove is at least partially located on the side of the first anti-crack dam close to the binding area and on the side of the second anti-crack dam away from the display area, and the first groove penetrates the first planarization layer along the light emitting direction of the display panel.

2. The display panel according to claim 1, characterized in that: The direction from the display area to the binding area is a first direction, and a direction perpendicular to the first direction and perpendicular to the light emitting direction of the display panel is a second direction. In the second direction, the width of the first groove is greater than or equal to 30 microns.

3. The display panel according to claim 1 or 2, characterized in that: The display panel further includes a second planarization layer, the second planarization layer is located on a side of the first planarization layer away from the substrate, and an orthographic projection of the second crack prevention dam on the substrate at least partially overlaps with an orthographic projection of the second planarization layer on the substrate; as well as Orthographic projections of the first planarization layer and the second planarization layer located between the first crack prevention dam and the second crack prevention dam on the substrate have no overlap.

4. The display panel according to claim 3, characterized in that: An orthographic projection of the second planarization layer on the substrate has no overlap with an orthographic projection of the first groove on the substrate.

5. The display panel according to claim 3, characterized in that: The display panel also includes a touch insulation layer, which is located on a side of the second planarization layer away from the substrate, and the orthographic projection of the first planarization layer located between the first anti-crack dam and the second anti-crack dam on the substrate at least partially overlaps with the orthographic projection of the touch insulation layer on the substrate.

6. The display panel according to claim 5, characterized in that: The display panel further includes: a first barrier dam, arranged around the display area, wherein an orthographic projection of the first barrier dam on the substrate is located on a side of an orthographic projection of the first anti-crack dam on the substrate close to the display area; a second barrier dam disposed around the first barrier dam, wherein an orthographic projection of the second barrier dam on the substrate is located between an orthographic projection of the first crack prevention dam on the substrate and an orthographic projection of the first barrier dam on the substrate; and A pixel definition layer is located on a side of the second planarization layer away from the substrate, the pixel definition layer includes a second groove located in the binding area, the second groove is located on a side of the second barrier dam away from the display area, and the second groove penetrates the pixel definition layer along the light emitting direction of the display panel.

7. The display panel according to claim 6, characterized in that: The binding region includes a binding terminal setting area, and an orthographic projection of the binding terminal setting area on the substrate is located within an orthographic projection of the second groove on the substrate.

8. The display panel according to claim 6, characterized in that: The display panel further comprises a spacer, wherein the spacer is located on a side of the pixel definition layer away from the substrate; The first barrier dam comprises a first dam foundation, a second dam foundation and a third dam foundation which are stacked, and the second barrier dam comprises a fourth dam foundation, a fifth dam foundation, a sixth dam foundation and a seventh dam foundation which are stacked; and The first dam base and the fifth dam base are in the same layer structure as the second planarization layer, the second dam base and the sixth dam base are in the same layer structure as the pixel definition layer, the third dam base and the seventh dam base are in the same layer structure as the spacer, and the fourth dam base is in the same layer structure as the first planarization layer.

9. The display panel according to claim 8, characterized in that: The display panel further includes a touch conductive layer, the touch conductive layer is located on a side of the touch insulating layer away from the substrate, and the touch conductive layer includes a touch trace located in the peripheral area; The orthographic projection of the touch trace on the substrate at least partially overlaps with the orthographic projections of the first barrier dam and the second barrier dam on the substrate; as well as The orthographic projections of the third dam, the fourth dam, and the seventh dam on the substrate do not overlap with the orthographic projection of the touch wiring on the substrate.

10. The display panel according to claim 9, characterized in that: The direction from the display area to the binding area is a first direction, and on the side of the edge area close to the binding area, an end of the fourth dam close to the binding area is located between an extension line of an end of the third dam close to the binding area along the first direction and an end of the seventh dam close to the binding area.

11. The display panel according to claim 10, characterized in that: The distance between one end of the fourth dam base close to the binding area and one end of the third dam base close to the binding area along the extension line of the first direction is equal to the distance between one end of the fourth dam base close to the binding area and one end of the seventh dam base close to the binding area.

12. The display panel according to claim 10, characterized in that: A distance between an extension line of one end of the third dam close to the binding area along the first direction and one end of the seventh dam close to the binding area is greater than or equal to 300 micrometers and less than or equal to 400 micrometers.

13. The display panel according to claim 9, characterized in that: The direction from the display area to the binding area is a first direction. In the first direction, the width of the fourth dam is smaller than the width of the seventh dam.

14. The display panel according to claim 9, characterized in that: In the light emitting direction of the display panel, the thicknesses of the first dam base and the fifth dam base first increase and then decrease along the direction from the display area to the binding area.

15. A display device, characterized in that: The display device comprises a chip-on-film and a display panel according to any one of claims 1 to 14, wherein the chip-on-film is electrically connected to the display panel.

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