Display panel, preparation method thereof and display device

Abstract

The invention provides a display panel, a preparation method thereof and a display device, the display panel is provided with a display area and a non-display area, the non-display area surrounds the display area, and the display panel comprises a substrate; the one or more dams are located on one side of the substrate and located in the non-display area, and the dams surround the display area; the at least one dam comprises a first part, the first part at least partially surrounds the display area, and the graph of the orthographic projection of the first part on the substrate comprises a non-straight line. According to the technical scheme, the stress generated on the dam during bending can be released, cracks or fractures of the dam are avoided, and then screen body packaging failure is avoided.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a method for preparing the same, and a display device. Background Art

[0002] With the development of display technology, users have higher and higher requirements for display devices such as high resolution and high screen-to-body ratio. As people pursue the ultimate screen-to-body ratio, display panels with narrow bezels or no bezels have attracted widespread attention. For example, the bezel area of ​​the display panel can be bent to achieve a nearly borderless display. However, there are still some problems after the screen is bent, such as failure of the screen display. Summary of the invention

[0003] In view of this, the embodiments of the present application provide a display panel and a method for manufacturing the same, and a display device to improve the situation where the screen display fails after being bent.

[0004] In a first aspect, an embodiment of the present application provides a display panel, which has a display area and a non-display area, wherein the non-display area surrounds the display area, and the display panel includes: a substrate; one or more dams located on one side of the substrate and in the non-display area, wherein the dams surround the display area; at least one dam includes a first portion, wherein the first portion at least partially surrounds the display area, and a figure of an orthographic projection of the first portion on the substrate includes a non-straight line.

[0005] In combination with the first aspect, the non-straight line includes at least one of a broken line and a wavy line; preferably, the first part includes a plurality of interconnected sub-dams and a connecting part between two adjacent sub-dams; along the direction perpendicular to the substrate, the film thickness of the connecting part is less than the film thickness of the sub-dam; preferably, along the direction perpendicular to the substrate, the film thickness of the connecting part ranges from greater than or equal to 4μm to less than or equal to 14μm; preferably, along the direction perpendicular to the substrate, the film thickness of the sub-dam ranges from greater than or equal to 5μm to less than or equal to 20μm; preferably, the shape of the orthographic projection of the sub-dam on the substrate includes at least one of a quadrilateral, a concave hexagon, a fan ring, and a semicircular ring; preferably, the shape of the orthographic projection of the connecting part on the substrate includes at least one of a straight line segment, an ellipse, a rectangle, a triangle, and a fan.

[0006] In combination with the first aspect, at least one dam also includes a second part, the second part is connected to the first part, the figure of the second part's orthographic projection on the substrate includes a straight line segment, and the second part partially surrounds the display area; preferably, the non-display area includes at least one bending area, and at least part of the first part is located in the bending area; preferably, the non-display area includes a non-bending area, and the second part is located in the non-bending area; preferably, the first part is located in the bending area and part of the non-bending area; preferably, one or two dams include a first dam and a second dam, the first dam surrounds the second dam, and the first dam and the second dam both include a first part and a second part; or, the first dam includes a first part and a second part, the second dam includes a third part, the figure of the third part's orthographic projection on the substrate includes a straight line segment, and the third part surrounds the display area.

[0007] In combination with the first aspect, the first portion surrounds the display area; preferably, one or two dams include a first dam and a second dam, the first dam surrounds the second dam, and the first dam and the second dam both include the first portion.

[0008] In combination with the first aspect, one or two dams include a first dam and a second dam, the first dam surrounds the second dam, the first dam includes a first part, and the first part surrounds the display area; the second dam includes a first part and a second part, the figure of the orthographic projection of the second part on the substrate includes a straight line segment, and the second part partially surrounds the display area; or, the second dam includes a third part, the figure of the orthographic projection of the third part on the substrate includes a straight line segment, and the third part surrounds the display area.

[0009] In combination with the first aspect, the dam includes a plurality of film layers stacked in sequence along a direction away from the substrate; preferably, the materials of the plurality of film layers include organic materials, inorganic materials or metal materials respectively; preferably, the material of the film layer farthest from the substrate among the plurality of film layers includes organic materials; preferably, the display panel also includes a first planarization layer and a second planarization layer stacked in sequence along a direction away from the substrate, and the dam includes a first film layer and a second film layer stacked in sequence along a direction away from the substrate, the first film layer and the first planarization layer are prepared in the same layer, and the second film layer and the second planarization layer are prepared in the same layer; preferably, the display panel also includes a pixel definition layer located on the side of the second planarization layer facing away from the substrate, the dam also includes a third film layer located on the side of the second film layer facing away from the substrate, and the pixel definition layer and the third film layer are prepared in the same layer; preferably, the display panel also includes a spacer layer located on the side of the pixel definition layer facing away from the substrate, the dam also includes a fourth film layer located on the side of the third film layer facing away from the substrate, and the spacer layer and the fourth film layer are prepared in the same layer.

[0010] In combination with the first aspect, in the cross section perpendicular to the substrate, the shape of the dam includes at least one of a triangle, a trapezoid, a rectangle, a square, and a semi-ellipse; preferably, the projection width of the dam on the substrate is greater than or equal to 5μm and less than or equal to 100μm.

[0011] In combination with the first aspect, the one or more dams include multiple dams, and the distance between the orthographic projections of two adjacent dams on the substrate is greater than or equal to 5μm and less than or equal to 100μm; preferably, the multiple dams include a first dam and a second dam, the first dam surrounds the second dam, and the distance between the orthographic projections of the first dam and the second dam on the substrate is greater than or equal to 5μm and less than or equal to 100μm.

[0012] In a second aspect, an embodiment of the present application provides a display device, including: the above-mentioned display panel.

[0013] In a third aspect, an embodiment of the present application provides a method for preparing a display panel, wherein the display panel has a display area and a non-display area, wherein the non-display area surrounds the display area, and the method comprises: preparing one or more dams on one side of a substrate, wherein the dams are located in the non-display area; at least one dam comprises a first portion, wherein the first portion at least partially surrounds the display area, and a figure of an orthographic projection of the first portion on the substrate comprises a non-straight line.

[0014] Through the above technical solution, the shape of at least part of the dam (i.e., the first part) is set to be a non-straight line, which is conducive to releasing the stress generated on the dam during bending and avoiding cracks or breaks in the dam due to stress concentration. The dam can effectively prevent the intrusion of water and oxygen and prevent the screen packaging from failing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a top view of a display panel provided in one embodiment of the present application.

[0016] Figure 2 is along Figure 1 Schematic diagram of the cross-section of the partial structure of AA'.

[0017] Figure 3a to Figure 3d They are respectively top views of a portion of the first portion provided in an embodiment of the present application.

[0018] Figures 4a to 4c They are respectively top views of a portion of the first portion provided in an embodiment of the present application.

[0019] Figure 5 is a top view of a display panel provided in another embodiment of the present application.

[0020] Figure 6 4 is a top view of a display panel provided in yet another embodiment of the present application.

[0021] Figure 7 4 is a top view of a display panel provided in another embodiment of the present application.

[0022] Figure 8 4 is a top view of a display panel provided in another embodiment of the present application.

[0023] Fig. 9 4 is a top view of a display panel provided in another embodiment of the present application.

[0024] Fig.10 4 is a top view of a display panel provided in another embodiment of the present application.

[0025] Fig.11 4 is a top view of a display panel provided in another embodiment of the present application.

[0026] Fig.12 4 is a top view of a display panel provided in another embodiment of the present application.

[0027] Fig.13 is along Figure 1 Schematic diagram of the cross-section of the partial structure of BB'.

[0028] Fig.14 It is a schematic diagram of the structure of a display device provided in one embodiment of the present application.

[0029] Fig.15 4 is a flow chart of a method for preparing a display panel provided in one embodiment of the present application. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] At present, in order to achieve a narrow frame or no frame, the display panel can be bent to achieve a frameless design of the screen. Usually, the display panel uses a dam (DAM) to prevent water and oxygen from invading to prevent display failure. However, after the screen is bent, the dam located in the bending area is easily damaged, for example, the film layer of the dam cracks, peels off or falls off, which leads to display failure of the screen.

[0032] In view of the above technical problems, in the first aspect, an embodiment of the present application provides a display panel. The display panel has a display area and a non-display area, and the non-display area surrounds the display area. The display panel includes: a substrate; one or more dams, located on one side of the substrate and located in the non-display area, and the dam surrounds the display area; at least one dam includes a first part, and the first part at least partially surrounds the display area, and the figure of the positive projection of the first part on the substrate includes a non-straight line. In the embodiment of the present application, the figure of at least part of the dam (i.e., the first part) is set to be a non-straight line, which is conducive to releasing the stress generated on the dam when bending, avoiding cracks or fractures in the dam due to stress concentration, and the dam can effectively prevent water and oxygen from invading and prevent the screen body packaging from failing.

[0033] Figure 1 is a top view of a display panel provided in one embodiment of the present application. Figure 2 is along Figure 1 A schematic cross-sectional view of the partial structure of the AA' line in FIG. Figure 1 and Figure 2 As shown, the display panel has a display area 110 and a non-display area 120, the non-display area 120 surrounds the display area 110, and the non-display area 110 includes a bending area 121. The display panel includes a substrate 10 and a dam 20. The substrate 10 includes a flexible substrate or a rigid substrate, which is not limited in the embodiment of the present application.

[0034] The dam 20 is located on one side of the substrate 10 and in the non-display area 120, and the dam 20 surrounds the display area 110. In the embodiment of the present application, the dam includes a first portion 210, the first portion 210 partially surrounds the display area 110, and the first portion 210 is located in the bending area 121, and the figure of the positive projection of the first portion 210 on the substrate 10 includes a non-straight line. In the embodiment of the present application, the non-straight line includes at least one of a broken line and a wavy line. Exemplarily, the non-straight line includes a broken line, a wavy line, a combination of a broken line or a wavy line, and the like.

[0035] like Figure 1 As shown, the first portion 210 includes a plurality of interconnected sub-dikes 211 and a connecting portion 212 between two adjacent sub-dikes 211. The shape after the plurality of sub-dikes 211 are connected is a non-straight line. Figure 2 As shown, along the direction perpendicular to the substrate 10, the film thickness H2 of the connecting portion 212 is less than the film thickness H1 of the sub-dam 211. In this way, when bending, the stress can be further released to avoid the breakage of the dam 20, thereby improving the problem of screen display failure caused by the breakage of the dam 20. Along the direction perpendicular to the substrate 10, the value range of the film thickness H2 of the connecting portion 212 is greater than or equal to 4μm and less than or equal to 14μm. Exemplarily, the film thickness H2 of the connecting portion 212 is 4μm, 6μm, 8μm, 10μm, 12μm, and 14μm. Along the direction perpendicular to the substrate 10, the value range of the film thickness H1 of the sub-dam 211 is greater than or equal to 5μm and less than or equal to 20μm. Exemplarily, the film thickness H1 of the sub-bank 211 is 5 μm, 7 μm, 9 μm, 11 μm, 13 μm, 15 μm, 18 μm, or 20 μm. In the embodiment of the present application, the film thicknesses of different sub-banks 211 may be the same or different, preferably the same.

[0036] In the embodiment of the present application, the shape of the orthographic projection of the connecting portion 212 on the substrate 10 includes at least one of a straight line segment, an ellipse, a rectangle, a triangle, and a sector. Figure 1 As shown, the shape of the positive projection of the connecting portion 212 on the substrate 10 is a straight line segment. Figure 3aAs shown, the shape of the orthographic projection of the connecting portion 212 on the substrate 10 is an ellipse. Figure 3b As shown, the shape of the positive projection of the connecting portion 212 on the substrate 10 is a rectangle. Figure 3c As shown, the shape of the positive projection of the connecting portion 212 on the substrate 10 is a triangle. Figure 3d As shown, the shape of the orthographic projection of the connecting portion 212 on the substrate 10 is a fan-shaped. It should be noted that the shape of the orthographic projection of the connecting portion 212 on the substrate 10 is only exemplary and not restrictive. The orthographic projection of the connecting portion 212 on the substrate 10 can also be other shapes as long as it can connect two adjacent sub-dams 211.

[0037] In the embodiment of the present application, the shape of the orthographic projection of the sub-dam 211 on the substrate 10 is not limited, as long as the shape after the multiple sub-dams 211 are connected is non-linear, so as to release stress. Optionally, the shape of the orthographic projection of the sub-dam 211 on the substrate 10 includes at least one of a quadrilateral, a concave hexagon, a fan ring, and a semicircular ring. For example, Figure 1 As shown in FIG. 1 , the orthographic projection of the sub-bank 211 on the substrate 10 is a quadrilateral. Figure 4a As shown, the orthographic projection of the sub-dam 211 on the substrate 10 is a concave hexagon (a shape formed by splicing two quadrilaterals). Figure 4b As shown, the orthographic projection of the sub-dam 211 on the substrate 10 is in the shape of a fan ring. Figure 4c As shown, the shape of the orthographic projection of the sub-dam 211 on the substrate 10 is a semicircular ring (a shape formed by splicing multiple fan rings).

[0038] Continue to refer Figure 1 , the dam 20 also includes a second portion 220, the second portion 220 is connected to the first portion 210 (for example, the second portion 220 and the first portion 210 are connected via a connecting portion 212), the figure of the orthographic projection of the second portion 220 on the substrate 10 includes a straight line segment, and the second portion 220 partially surrounds the display area 110. The display panel also includes at least one non-bending area 122, and the second portion 220 is located in the non-bending area 122. In the embodiment of the present application, the non-bending area 122 means that the display panel on that side does not need to be bent. Since the dam 20 is also bent at the same time when bending, the first portion 210 located in the bending area 121 may pull the second portion 220 located in the non-bending area 122, causing cracks or breaks in the second portion 220. Therefore, at least a portion of the first portion 210 may be located in the non-bending area 122, such as Figure 5 As shown. Figure 5 In the figure, the first portion 210 is located in the bending area 121 and part of the non-bending area 122, so that the stress at the connection between the bending area 121 and the non-bending area 122 can be relieved to prevent the dam 20 from breaking.

[0039] In some embodiments, the first portion 210 surrounds the display area 110, that is, the dam 20 only includes the first portion 210. Figure 6 As shown, the non-display area 120 includes a bending area 121 and a non-bending area 122, and the first portion 210 is located in the bending area 121 and the non-bending area 122, so that the stress on the dam 20 can be further relieved to prevent the dam 20 from being damaged. Figure 7 As shown, the non-display area 120 includes four bending areas 121, and the first portion 210 is located in the bending area 121. In this way, the stress on the dam 20 can be relieved to prevent the dam 20 from being damaged. It can be understood that the non-display area 120 can also include other numbers of bending areas 121. For example, one bending area 121 ( Figure 1 As shown), two bending areas 121, three bending areas 121, etc. In the embodiment of the present application, the first portion 210 may be located only in the bending area 121, or in the bending area 121 and part of the non-bending area 122, or in the bending area 121 and the non-bending area 122, as long as the first portion 210 is at least located in the bending area 121.

[0040] Figure 8 4 is a top view of a display panel provided in another embodiment of the present application. Figure 8 The display panel shown is Figure 5 The difference of the display panel shown is that the dam 20 includes two dams, namely the first dam 21 and the second dam 22, and the first dam 21 surrounds the second dam 22. The first dam 21 and the second dam 22 both include a first portion 210 and a second portion 220. In this way, when the display panel is bent, cracks or breaks in the first dam 21 and the second dam 22 can be avoided, thereby ensuring the packaging effect. Since the second dam 22 is closer to the display area 110, the second dam 22 may not be bent, and therefore, the second dam 22 may not be provided with the first portion 210. For example, as Fig. 9 As shown, the second dam 22 includes a third portion 230, the orthographic projection of the third portion 230 on the substrate 10 includes a straight line segment, and the third portion 230 surrounds the display area 120. The orthographic projection of the third portion 230 on the substrate 10 includes a straight line segment, which can simplify the manufacturing process and reduce the difficulty of manufacturing.

[0041] Fig.10 4 is a top view of a display panel provided in another embodiment of the present application. Fig.10 The display panel shown is Figure 6 The difference of the display panel shown is that the bank 20 includes a first bank 21 and a second bank 22 , the first bank 21 surrounds the second bank 22 , the first bank 21 and the second bank 22 both include a first portion 210 , and the first portion 210 surrounds the display area 110 .

[0042] Fig.11 4 is a top view of a display panel provided in another embodiment of the present application. Fig.11 The display panel shown is Fig.10 The difference between the display panel shown is that the second dam 22 includes a first portion 210 and a second portion 220 , the first portion 210 is located in the bending area 121 , the second portion 220 is located in the non-bending area 122 , and the second portion 220 partially surrounds the display area 110 .

[0043] Fig.12 4 is a top view of a display panel provided in another embodiment of the present application. Fig.12 The display panel shown is Fig.10 The difference of the display panel shown is that the second dam 22 includes a third portion 230 , the orthographic projection of the third portion 230 on the substrate 10 includes a straight line segment, and the third portion 230 surrounds the display area 110 .

[0044] It should be noted that Figures 10 to 12 The non-display area 120 in the example includes one bending area 121. The same is true for the case where the non-display area 120 includes multiple bending areas 121 (for example, four bending areas 121), which will not be described in detail here.

[0045] In the embodiment of the present application, the dam 20 includes a plurality of film layers stacked in sequence in a direction away from the substrate 10. In the embodiment of the present application, the materials of the plurality of film layers include organic materials, inorganic materials or metal materials, which are not limited in the present application. Among the plurality of film layers, the material of the film layer farthest from the substrate 10 includes organic materials.

[0046] In the embodiment of the present application, the display panel further includes a first planarization layer and a second planarization layer stacked in sequence in a direction away from the substrate 10, and the dam 20 includes a first film layer and a second film layer stacked in sequence in a direction away from the substrate 10, the first film layer and the first planarization layer are prepared in the same layer, and the second film layer and the second planarization layer are prepared in the same layer. Optionally, the display panel further includes a pixel definition layer located on the side of the second planarization layer away from the substrate 10, and the dam 20 further includes a third film layer located on the side of the second film layer away from the substrate 10, and the pixel definition layer and the third film layer are prepared in the same layer. Optionally, the display panel further includes a spacer layer located on the side of the pixel definition layer away from the substrate 10, and the dam 20 further includes a fourth film layer located on the side of the third film layer away from the substrate 10, and the spacer layer and the fourth film layer are prepared in the same layer.

[0047] For example, Fig.13 yes Figure 1 Schematic diagram of the cross section of the display panel along BB'. Fig.13As shown, the dam 20 includes a first film layer 201, a second film layer 202, a third film layer 203 and a fourth film layer 204 which are stacked in sequence in a direction away from the substrate. The first film layer 201 is prepared in the same layer as the first planarization layer of the display panel, the second film layer 202 is prepared in the same layer as the second planarization layer of the display panel, the third film layer 203 is prepared in the same layer as the pixel definition layer of the display panel, and the fourth film layer 204 is prepared in the same layer as the spacer layer of the display panel.

[0048] Continue to refer Fig.13 , along the cross section perpendicular to the substrate direction, the shape of the dam 20 includes a trapezoid. It is understood that the dam 20 may also include other shapes. Exemplarily, along the cross section perpendicular to the substrate direction, the shape of the dam 20 includes at least one of a triangle, a rectangle, a square, and a semi-ellipse. The projection width P1 of the dam 20 on the substrate 10 is greater than or equal to 5μm and less than or equal to 100μm. Exemplarily, the projection width P1 of the dam 20 on the substrate 10 is 5μm, 10μm, 20μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm.

[0049] In an embodiment of the present application, the dam 20 includes a plurality of dams 20, and the distance between the orthographic projections of two adjacent dams 20 on the substrate 10 is greater than or equal to 5 μm and less than or equal to 100 μm. Exemplarily, the distance between the orthographic projections of two adjacent dams 20 on the substrate 10 is 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm. The spacing between different adjacent dams 20 may be the same or different. Optionally, the dam 20 includes a first dam 21 and a second dam 22, the first dam 21 surrounds the second dam 22, and the distance between the orthographic projections of the first dam 21 and the second dam 22 on the substrate 10 is greater than or equal to 5 μm and less than or equal to 100 μm. Exemplarily, the distance between the orthographic projections of the first bank 21 and the second bank 22 on the substrate 10 is 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm.

[0050] In the embodiment of the present application, the display panel may further include an encapsulation layer, which is located on the side of the dam 20 away from the substrate 10. The encapsulation layer includes a first inorganic layer, an organic layer, and a second inorganic layer. Among them, in the embodiment of the present application, the organic layer can be prepared by inkjet printing (IJP) technology. Specifically, the organic layer has fluidity at a preset temperature, and the IJP technology is used to set it in the area surrounded by the dam 20, and wait for it to be leveled and solidified, which can further block the invasion of water and oxygen and improve the encapsulation effect.

[0051] The first inorganic layer and the second inorganic layer can be formed by chemical vapor deposition (CVD).

[0052] In addition, in the embodiment of the present application, in addition to the sandwich structure of inorganic layer / organic layer / inorganic layer, the encapsulation layer may also adopt a multi-layer inorganic layer structure, or adopt other forms of structures including overlapping organic layers and inorganic layers. Preferably, the encapsulation layer includes at least one organic layer and at least one inorganic layer alternately stacked in sequence to improve the encapsulation effect.

[0053] In the embodiment of the present application, the material of the inorganic layer constituting the encapsulation layer may be silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiON), aluminum oxide (Al2O3), etc. Preferably, the material of the inorganic layer constituting the encapsulation layer may be silicon nitride, which has a good effect of blocking water and oxygen, and can further improve the encapsulation effect. The material of the organic layer may be one or a combination of polyvinyl alcohol, polyurethane acrylate polymer, and polyimide resin, but the present application is not limited thereto.

[0054] Optionally, in the embodiment of the present application, the display panel may further include an organic light-emitting element. The organic light-emitting element is located in the display area 110. The encapsulation layer covers the organic light-emitting structure and the dam 20. The organic light-emitting element includes a first electrode, an organic light-emitting layer, and a second electrode. The first electrode may be an anode and the second electrode may be a cathode; or the first electrode may be a cathode and the second electrode may be an anode.

[0055] The organic light-emitting layer includes a hole injection layer, a hole blocking layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron blocking layer, and an electron injection layer. The organic light-emitting layer is between the first electrode and the second electrode. If the first electrode is an anode and the second electrode is a cathode, the organic light-emitting layer can emit light due to the combination of holes provided from the first electrode and electrons provided from the second electrode.

[0056] In a second aspect, an embodiment of the present application further provides a display device, which includes: the display panel in the above embodiment.

[0057] Fig.14 is a schematic diagram of the structure of a display device provided by another embodiment of the present application. Fig.14 As shown, the display device 100 is a product with an image display function. For example, the display device 100 can be used to display static images, such as pictures or photos. The display device 100 can also be used to display dynamic images, such as videos.

[0058] The display device 100 may be a notebook computer, a mobile phone, a handheld or portable computer, a camera, a camcorder, a vehicle-mounted intelligent central control screen, a calculator, a smart watch, a GPS navigator, an electronic photo, an electronic billboard or sign, a projector, etc.

[0059] The display device 100 includes the display panel described in the above embodiment, which may be an organic light emitting diode display panel or a quantum dot electroluminescent display panel.

[0060] In addition, the display device 100 may also have functions such as taking pictures, recording videos, fingerprint recognition, face recognition, etc. Accordingly, the display device 100 also includes at least one functional module for implementing the above functions, such as an under-screen camera, an under-screen fingerprint recognition sensor, etc.

[0061] In a third aspect, the present application also provides a method for preparing a display panel, which is used to prepare the display panel described in the above embodiment.

[0062] Fig.15 : is a flow chart of a preparation method provided by another embodiment of the present application. The method is used to prepare the display panel in the above embodiment, the display panel has a display area and a non-display area, the non-display area surrounds the display area, and the non-display area includes at least one bending area. Fig.15 As shown, the method includes the following contents.

[0063] In step S1501, one or more dams are formed on one side of a substrate, and the dams are located in a non-display area.

[0064] Optionally, multiple layers of inorganic film layers and / or metal and / or organic film layers are deposited on one side of the substrate to form film layers required for preparing the dam; then, the formed film layers are patterned to obtain the dam. Among them, at least one dam includes a first portion, at least part of the first portion is located in the bending area, and the figure of the orthographic projection of the first portion on the substrate includes a non-straight line. In an embodiment of the present application, the dam can be prepared simultaneously when preparing multiple film layers of the display panel. For example, when preparing at least one of the first planarization layer, the second planarization layer, and the pixel definition layer of the display panel, the dam is formed.

[0065] In the embodiment of the present application, the substrate may be an array substrate.

[0066] In the embodiment of the present application, the dam 20 includes a plurality of interconnected sub-dams 211 and a connecting portion 212 between two adjacent sub-dams, and along a direction perpendicular to the substrate 10, the film thickness of the connecting portion 212 is less than the film thickness of the sub-dam 211. In the embodiment of the present application, the film layer at the connecting portion 212 may be thinned (for example, by a photolithography process) to achieve that the film thickness of the connecting portion 212 is less than the film thickness of the sub-dam 211.

[0067] The specific working principle and benefits of the preparation method provided in the embodiment of the present application are similar to the specific working principle and benefits of the display panel provided in the embodiment of the present application, and will not be repeated here.

[0068] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0069] The words such as "including", "comprising", "having" and the like mentioned in this application are open words, meaning "including but not limited to", and can be used interchangeably therewith. The words "or" and "and" used herein mean the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably therewith.

[0070] It should be understood that the qualifiers "first", "second", "third" and "fourth" used in the description of the embodiments of the present invention are only used to more clearly illustrate the technical solutions and cannot be used to limit the scope of protection of the present invention.

[0071] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A display panel, characterized in that: The display panel has a display area and a non-display area, wherein the non-display area surrounds the display area, and the display panel includes: substrate; One or more dams, located on one side of the substrate and in the non-display area, the dams surround the display area; At least one of the dams includes a first portion, the first portion at least partially surrounds the display area, and a figure of an orthographic projection of the first portion on the substrate includes a non-straight line.

2. The display panel according to claim 1, characterized in that: The non-straight line includes at least one of a broken line and a wavy line; Preferably, the first portion includes a plurality of interconnected sub-dikes and a connecting portion between two adjacent sub-dikes; Along a direction perpendicular to the substrate, the film thickness of the connecting portion is smaller than the film thickness of the sub-dam; Preferably, along a direction perpendicular to the substrate, the thickness of the film layer of the connecting portion ranges from greater than or equal to 4 μm to less than or equal to 14 μm; Preferably, along the direction perpendicular to the substrate, the thickness of the film layer of the sub-dam is in the range of greater than or equal to 5 μm and less than or equal to 20 μm; Preferably, the shape of the orthographic projection of the sub-dam on the substrate includes at least one of a quadrilateral, a concave hexagon, a fan ring, and a semicircular ring; Preferably, the shape of the orthographic projection of the connecting portion on the substrate includes at least one of a straight line segment, an ellipse, a rectangle, a triangle, and a sector.

3. The display panel according to claim 1, characterized in that: The at least one dam further includes a second portion, the second portion is connected to the first portion, a figure of an orthographic projection of the second portion on the substrate includes a straight line segment, and the second portion partially surrounds the display area; Preferably, the non-display area includes at least one bending area, and at least a portion of the first portion is located in the bending area; Preferably, the non-display area further includes a non-bending area, and the second portion is located in the non-bending area; Preferably, the first portion is located in the bending area and part of the non-bending area; Preferably, the one or two dams include a first dam and a second dam, the first dam surrounds the second dam, and the first dam and the second dam both include the first part and the second part; or, the first dam includes the first part and the second part, the second dam includes a third part, the figure of the orthographic projection of the third part on the substrate includes a straight line segment, and the third part surrounds the display area.

4. The display panel according to claim 1, characterized in that: The first portion surrounds the display area; Preferably, the one or two dikes include a first dike and a second dike, the first dike surrounds the second dike, and the first dike and the second dike both include the first portion.

5. The display panel according to claim 1, characterized in that: The one or two dams include a first dam and a second dam, the first dam surrounds the second dam, the first dam includes a first portion, and the first portion surrounds the display area; The second dam includes the first part and the second part, the figure of the orthographic projection of the second part on the substrate includes a straight line segment, and the second part partially surrounds the display area; or, the second dam includes a third part, the figure of the orthographic projection of the third part on the substrate includes a straight line segment, and the third part surrounds the display area.

6. The display panel according to claim 1, characterized in that: The dam comprises a plurality of film layers stacked in sequence in a direction away from the substrate; Preferably, the materials of the plurality of film layers include organic materials, inorganic materials or metal materials respectively; Preferably, the material of the film layer farthest from the substrate among the multiple film layers comprises an organic material; Preferably, the display panel further comprises a first planarization layer and a second planarization layer sequentially stacked in a direction away from the substrate, the dam comprises a first film layer and a second film layer sequentially stacked in a direction away from the substrate, the first film layer and the first planarization layer are prepared in the same layer, and the second film layer and the second planarization layer are prepared in the same layer; Preferably, the display panel further comprises a pixel definition layer located on a side of the second planarization layer away from the substrate, the dam further comprises a third film layer located on a side of the second film layer away from the substrate, and the pixel definition layer and the third film layer are prepared in the same layer; Preferably, the display panel further comprises a spacer layer located on a side of the pixel definition layer away from the substrate, the dam further comprises a fourth film layer located on a side of the third film layer away from the substrate, and the spacer layer and the fourth film layer are prepared in the same layer.

7. The display panel according to claim 1, characterized in that: In a cross section perpendicular to the substrate, the shape of the dam includes at least one of a triangle, a trapezoid, a rectangle, a square, and a semi-ellipse; Preferably, a projection width of the dam on the substrate is greater than or equal to 5 μm and less than or equal to 100 μm.

8. The display panel according to claim 1, characterized in that: The one or more dams include multiple dams, and the distance between the orthographic projections of two adjacent dams on the substrate is greater than or equal to 5 μm and less than or equal to 100 μm; Preferably, the plurality of banks include a first bank and a second bank, the first bank surrounds the second bank, and a distance between orthographic projections of the first bank and the second bank on the substrate is greater than or equal to 5 μm and less than or equal to 100 μm.

9. A display device, characterized in that: include: The display panel according to any one of claims 1 to 8.

10. A method for preparing a display panel, characterized in that: The display panel has a display area and a non-display area, and the non-display area surrounds the display area. The method includes: One or more dams are formed on one side of the substrate, wherein the dams are located in the non-display area; At least one of the dams includes a first portion, the first portion at least partially surrounds the display area, and a pattern of an orthographic projection of the first portion on the substrate includes a non-straight line.

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