Display panel, crack detection method thereof, and display device

Abstract

Embodiments of the present application provide a display panel, a crack detection method thereof and a display device, to accurately determine the position of a crack. The display panel comprises a display area and a non-display area; a crack detection line in the non-display area, the crack detection line comprising a main detection line and at least one auxiliary detection line, the main detection line surrounding the display area, and the auxiliary detection line comprising a first end portion and a second end portion, the first end portion and the second end portion being connected to the main detection line respectively.

Description

[0001] The present application relates to the technical field of display, in particular to a display panel, a crack detection method thereof and a display device.

[0002] In the process of the display panel, the edge of the display panel is easy to be damaged and generate cracks, and the cracks extend from the edge to the inside, which can cause the metal wiring in the display panel to break, and further cause adverse effects on the normal display of the display panel. Especially for the flexible display panel, the display panel is soft in texture, and thus is more likely to generate cracks.

[0003] However, based on the existing structure of the display panel, when the crack detection is performed, it can only be determined whether the display panel has cracks, and the position of the cracks cannot be determined, and thus it is difficult to confirm the process capability and subsequent process analysis.

[0004] Therefore, the embodiments of the present application provide a display panel, a crack detection method thereof and a display device, which can accurately determine the position of the cracks.

[0005] In one aspect, the present application provides a display panel, comprising:

[0006] a display area and a non-display area;

[0007] a crack detection line located in the non-display area, the crack detection line comprising a main detection line and at least one auxiliary detection line, the main detection line surrounding the display area, the auxiliary detection line comprising a first end portion and a second end portion, the first end portion and the second end portion being connected to the main detection line respectively.

[0008] In another aspect, the present application provides a crack detection method of a display panel, the display panel comprising a display area and a non-display area, the non-display area comprising a crack detection line, the crack detection line comprising a main detection line and at least one auxiliary detection line, the main detection line surrounding the display area, the auxiliary detection line comprising a first end portion and a second end portion, the first end portion and the second end portion being connected to the main detection line respectively;

[0009] The crack detection method comprises:

[0010] obtaining a first preset resistance, the first preset resistance being a resistance of the crack detection line when the auxiliary detection line or a main wiring segment is broken, wherein the main wiring segment is a part of the main detection line which is arranged in parallel with the auxiliary detection line;

[0011] ​​​Detect the actual resistance of the crack detection line, and determine whether the actual resistance matches the first preset resistance.

[0012] In another aspect, the embodiment of the present application provides a display device comprising the display panel.

[0013] One of the above technical solutions has the following beneficial effects:

[0014] In the embodiment of the present application, by arranging the auxiliary detection line electrically connected to the main detection line, the auxiliary detection line and the part of the main wire segment in parallel with the auxiliary detection line form a parallel structure. Even if the auxiliary detection line or the main wire segment in the parallel structure is broken, the overall crack detection line is still connected.

[0015] Based on the above structure, the overall resistance of the crack detection line when the auxiliary detection line and the main wire segment in the parallel structure are not broken is different from the overall resistance of the crack detection line when the auxiliary detection line or the main wire segment in the parallel structure is broken. Then, whether the auxiliary detection line or the main wire segment is broken under the action of the crack can be determined according to the resistance difference. For example, the first preset resistance of the crack detection line when the auxiliary detection line or the main wire segment in the parallel structure is broken can be calculated. Then, when the actual resistance of the crack detection line is detected, if the actual resistance matches the first preset resistance, it means that the auxiliary detection line or the main wire segment in the parallel structure is broken. Therefore, the position of the parallel structure is the position of the crack, thereby realizing accurate determination of the position of the crack. In this way, the process capability and subsequent process analysis can be confirmed according to the position of the crack, which helps to improve and repair the display panel subsequently.

DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 A top view of the display panel provided by the embodiment of the present application;

[0018] Figure 2 Another top view of the display panel provided by the embodiment of the present application;

[0019] Figure 3Still another top view of the display panel provided by the embodiment of the present application;

[0020] Figure 4 For Figure 3 A sectional view along the direction of F1-F2;

[0021] Figure 5 For Figure 2 A sectional view along the direction of A1-A2;

[0022] Figure 6 Still another top view of the display panel provided by the embodiment of the present application;

[0023] Figure 7 For Figure 6 A sectional view along the direction of B1-B2;

[0024] Figure 8 A film layer position schematic view of the main detection line and the auxiliary detection line provided by the embodiment of the present application;

[0025] Figure 9 Another film layer position schematic view of the main detection line and the auxiliary detection line provided by the embodiment of the present application;

[0026] Figure 10 Still another film layer position schematic view of the main detection line and the auxiliary detection line provided by the embodiment of the present application;

[0027] Figure 11 Still another film layer position schematic view of the main detection line and the auxiliary detection line provided by the embodiment of the present application;

[0028] Figure 12 Still another film layer position schematic view of the main detection line and the auxiliary detection line provided by the embodiment of the present application;

[0029] Figure 13 Still another film layer position schematic view of the main detection line and the auxiliary detection line provided by the embodiment of the present application;

[0030] Figure 14 Still another top view of the display panel provided by the embodiment of the present application;

[0031] Figure 15 Still another top view of the display panel provided by the embodiment of the present application;

[0032] Figure 16 Still another top view of the display panel provided by the embodiment of the present application;

[0033] Figure 17 Still another top view of the display panel provided by the embodiment of the present application;

[0034] Figure 18 FIG. 1 is a schematic diagram of a display device according to an embodiment of the present application; Figure 17 FIG. 2 is a sectional view along the C1-C2 direction;

[0035] Figure 19 FIG. 3 is another plan view of a display panel according to an embodiment of the present application;

[0036] Figure 20 FIG. 4 is a sectional view along the D1-D2 direction; Figure 19

[0037] Figure 21 FIG. 5 is another sectional view along the D1-D2 direction; Figure 19

[0038] Figure 22 FIG. 6 is another plan view of a display panel according to an embodiment of the present application;

[0039] Figure 23 FIG. 7 is a partial schematic diagram of a display panel according to an embodiment of the present application;

[0040] Figure 24 FIG. 8 is a flowchart of a crack detection method according to an embodiment of the present application;

[0041] Figure 25 FIG. 9 is another flowchart of a crack detection method according to an embodiment of the present application;

[0042] Figure 26 FIG. 10 is a schematic diagram of a display device according to an embodiment of the present application.

DETAILED DESCRIPTION

[0043] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0044] It should be clear that the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0045] The terms used in the embodiments of the present application are only for the purpose of describing the specific embodiments, and are not intended to limit the present application. The singular forms "a", "an" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0046] ​​It should be understood that the term "and / or" as used herein merely describes an associated relationship, which means that there can be three relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0047] The embodiment of the present application provides a display panel, such as Figure 1 and Figure 2 as shown, Figure 1 is a top view of the display panel provided by the embodiment of the present application, Figure 2 is another top view of the display panel provided by the embodiment of the present application, the display panel comprises a display area 1, a non-display area 2 and a crack detection line 3 located in the non-display area 2, the crack detection line 3 comprises a main detection line 4 and at least one auxiliary detection line 5.

[0048] The main detection line 4 surrounds the display area 1, for example, the main detection line 4 can surround the display area 1 without being closed, and the main detection line 4 leaves an opening at the lower frame to facilitate the wiring design of the lower frame. The auxiliary detection line 5 comprises a first end portion 6 and a second end portion 7, and the first end portion 6 and the second end portion 7 are connected to the main detection line 4 respectively.

[0049] In the prior art, the crack detection line in the display panel is only the main detection line surrounding the display area. In this structure, no matter where the crack occurs, it will cause the crack detection line to be open, so that the resistance becomes infinite. Thus, when the crack is detected, it can only be judged whether the display panel has a crack according to the resistance of the crack detection line, but the position of the crack cannot be judged.

[0050] In the embodiment of the present application, by arranging the auxiliary detection line 5 electrically connected to the main detection line 4, the auxiliary detection line 5 and the part of the main wire segment 8 in parallel with the auxiliary detection line 5 form a parallel structure. Even if the auxiliary detection line 5 or the main wire segment 8 in the parallel structure is broken, the overall crack detection line 3 is still connected.

[0051] Based on the above structure, the overall resistance of the crack detection line 3 when neither the auxiliary detection line 5 nor the main wire segment 8 in the parallel structure is broken is different from the overall resistance of the crack detection line 3 when the auxiliary detection line 5 or the main wire segment 8 in the parallel structure is broken, and then the resistance difference can be used to determine whether the auxiliary detection line 5 or the main wire segment 8 is broken under the action of the crack. For example, the first preset resistance of the crack detection line 3 when the auxiliary detection line 5 or the main wire segment 8 in the parallel structure is broken can be calculated, and then when the actual resistance of the crack detection line 3 is detected, if the actual resistance matches the first preset resistance, it means that the auxiliary detection line 5 or the main wire segment 8 in the parallel structure is broken, and then it can be known that the position of the parallel structure is the position where the crack is generated, thereby realizing accurate judgment of the position where the crack is generated. In this way, the process capability and subsequent process analysis can be confirmed according to the position where the crack is generated, which is helpful for subsequent improvement and repair of the display panel.

[0052] Moreover, in the embodiment of the present application, when the crack is detected, only the actual resistance of the crack detection line 3 is needed to determine the position where the crack is generated, without the need for picture lighting or setting a position detector in the display panel, and the detection method is more simple and the detection cost is lower.

[0053] In addition, it should be noted that in the embodiment of the present application, referring to Figure 1 , the crack detection line 3 can only include one auxiliary detection line 5, for example, only one auxiliary detection line 5 can be set at the position where the crack is most likely to occur, so as to monitor this position. Figure 2 , the crack detection line 3 can also include multiple auxiliary detection lines 5 to form multiple position detection points, so as to more accurately determine the position where the crack is generated.

[0054] In a feasible implementation, referring to Figure 1 and Figure 2 , the auxiliary detection line 5 is located on the side of the main detection line 4 away from the display area 1.

[0055] Since the crack is mostly generated at the edge of the display panel and extends from outside to inside, when the auxiliary detection line 5 is located on the side of the main detection line 4 close to the edge of the panel, the auxiliary detection line 5 will first perceive the crack and be broken, that is, the above structure is based on whether the auxiliary detection line 5 is broken to detect the position where the crack is generated.

[0056] When the crack detection line 3 comprises a plurality of auxiliary detection lines 5, the plurality of auxiliary detection lines 5 can be arranged at intervals along the extension direction of the main detection line 4, and the resistances of different auxiliary detection lines 5 can be different, at this time, the influence degrees of the resistances of different auxiliary detection lines 5 on the overall resistance of the crack detection line 3 are different, and thus the crack detection line 3 has different resistances when the different auxiliary detection lines 5 are broken.

[0057] Based on this, when the first preset resistance of the crack detection line 3 is calculated in advance, the calculated first preset resistance can comprise the resistance of the crack detection line 3 when any i auxiliary detection lines 5 are broken, i takes values 1, 2, 3, …, x in turn, and x is the number of auxiliary detection lines 5 included in the crack detection line 3. Taking x = 3 as an example, the first preset resistance can comprise the resistance of the crack detection line 3 when the first auxiliary detection line 5 is broken, the resistance of the crack detection line 3 when the second auxiliary detection line 5 is broken, the resistance of the crack detection line 3 when the third auxiliary detection line 5 is broken, the resistance of the crack detection line 3 when the first and second auxiliary detection lines 5 are broken, the resistance of the crack detection line 3 when the second and third auxiliary detection lines 5 are broken, the resistance of the crack detection line 3 when the first and third auxiliary detection lines 5 are broken, and the resistance of the crack detection line 3 when all the three auxiliary detection lines 5 are broken.

[0058] When the crack is detected, the actual resistance of the detected crack detection line 3 is compared with the first preset resistance calculated in advance, when the actual resistance matches one of the first preset resistances, it can be known according to the matched first preset resistance which auxiliary detection line 5 or auxiliary detection lines 5 are broken, and then the position of the crack can be known.

[0059] In the embodiment of the application, the auxiliary detection line 5 can be understood as an additional structure relative to the main detection line 4, when the position of the crack is detected based on whether the auxiliary detection line 5 is broken, only the resistance of the different auxiliary detection lines 5 needs to be adjusted, without changing the design parameters of the main detection line 4, so that the adjustment degree of the overall design parameters of the crack detection line 3 is small, and the adjustment mode is more flexible.

[0060] In a feasible implementation manner, as shown in Figure 3 , the auxiliary detection line 5 is arranged on the main detection line 4. Figure 3 In another top view of the display panel provided by the embodiment of the application, the line width k1 of the auxiliary detection line 5 is less than or equal to the line width k2 of the main detection line 4. For example, in a setting mode of the embodiment of the application, the line width k1 of the auxiliary detection line 5 is less than the line width k2 of the main detection line 4.

[0061] The line width of the auxiliary detection line 5 refers to the width of the orthogonal projection of the auxiliary detection line 5 in the direction perpendicular to the plane of the display panel.

[0062] In this arrangement, the auxiliary detection line 5 is relatively thin, and when the auxiliary detection line 5 is located on the side of the main detection line 4 close to the edge of the panel, the auxiliary detection line 5 is more likely to break under the action of the crack, making the auxiliary detection line 5 more sensitive to the crack and thus more accurate in crack detection.

[0063] In one possible implementation, as shown in Figure 4 , Figure 4 , Figure 3 In one possible implementation, as shown in ,

[0064] The thickness of the auxiliary detection line 5 refers to the thickness of the auxiliary detection line 5 in the direction perpendicular to the plane of the display panel, and the thickness of the main detection line 4 refers to the thickness of the main detection line 4 in the direction perpendicular to the plane of the display panel.

[0065] In one possible implementation, as shown in Figure 2 , Figures 5-7 , Figure 5 , Figure 2 In one possible implementation, as shown in Figure 6 , Figure 7 In one possible implementation, as shown in Figure 6 , The distance d2 between the auxiliary detection line 5 and the substrate 9 is less than or equal to the distance d1 between the main detection line 4 and the substrate 9.

[0066] For example, in one arrangement of the embodiment of the present application, as shown in Figure 5 , the distance d2 between the auxiliary detection line 5 and the substrate 9 is equal to the distance d1 between the main detection line 4 and the substrate 9, in which case the auxiliary detection line 5 and the main detection line 4 can be arranged in the same layer. In this structure, the auxiliary detection line 5 and the main detection line 4 can be separated from the substrate 9 by at least one insulating layer 12.

[0067] In another arrangement of the embodiment of the present application, as shown in Figure 6 , the distance d2 between the auxiliary detection line 5 and the substrate 9 is greater than the distance d1 between the main detection line 4 and the substrate 9.Figure 7 In this configuration, the distance d2 between the auxiliary detection line 5 and the substrate 9 is less than the distance d1 between the main detection line 4 and the substrate 9. Therefore, the auxiliary detection line 5 and the main detection line 4 can be disposed in different layers. The first end 6 of the auxiliary detection line 5 is electrically connected to the main detection line 4 through a first via 10, and the second end 7 of the auxiliary detection line 5 is electrically connected to the main detection line 4 through a second via 11. In this structure, at least one insulating layer 12 separates the auxiliary detection line 5 from the substrate 9, and at least one insulating layer 12 also separates the auxiliary detection line 5 from the main detection line 4 from the substrate 9.

[0068] In the above structure, the distance between the auxiliary detection line 5 and the substrate 9 is relatively small, especially when the distance between the auxiliary detection line 5 and the substrate 9 is smaller than the distance between the main detection line 4 and the substrate 9. Compared to the main detection line 4, the auxiliary detection line 5 is closer to the substrate 9. Since cracks mostly originate on the substrate 9, the auxiliary detection line 5 is more sensitive to crack detection and is more likely to break under the influence of cracks. When the auxiliary detection line 5 is located on the side of the main detection line 4 near the edge of the panel, and the location of crack origin needs to be determined based on whether the auxiliary detection line 5 has broken, this structure can improve the accuracy of crack detection.

[0069] Furthermore, such as Figures 8-10 As shown, Figure 8 This is a schematic diagram of the film position of the main detection line 4 and the auxiliary detection line 5 provided in an embodiment of the present invention. Figure 9 This is a schematic diagram showing another film layer position of the main detection line 4 and the auxiliary detection line 5 provided in an embodiment of the present invention. Figure 10 This is a schematic diagram illustrating another film layer position of the main detection line 4 and auxiliary detection line 5 provided in an embodiment of the present invention. The display panel includes a semiconductor layer 13 and a first metal layer 14. The first metal layer 14 is located between the semiconductor layer 13 and the substrate 9, and the auxiliary detection line 5 is located on the first metal layer 14. In this case, the auxiliary detection line 5 is located on the metal layer closest to the substrate 9. The auxiliary detection line 5 is very close to the substrate 9, making it more sensitive to crack detection.

[0070] In addition, it should be noted that, see again Figure 8 and Figure 9 The display panel also includes a buffer layer 15 located between the first metal layer 14 and the semiconductor layer 13, a gate insulating layer 16 located on the side of the semiconductor layer 13 facing away from the substrate 9, a second metal layer 17 located on the side of the gate insulating layer 16 facing away from the substrate 9, a first interlayer insulating layer 18 located on the side of the second metal layer 17 facing away from the substrate 9, a third metal layer 19 located on the side of the first interlayer insulating layer 18 facing away from the substrate 9, a second interlayer insulating layer 20 located on the side of the third metal layer 19 facing away from the substrate 9, and a fourth metal layer 21 located on the side of the second interlayer insulating layer 20 facing away from the substrate 9.

[0071] Understandably, see again Figure 8 and Figure 9 The display panel includes transistor 22 and storage capacitor 23. The semiconductor layer 13 includes the active layer p of transistor 22, the second metal layer 17 includes the gate g of transistor 22 and the first electrode c1 of storage capacitor 23, the third metal layer 19 includes the second electrode c2 of storage capacitor 23, and the fourth metal layer 21 includes the first electrode s and the second electrode d of transistor 22.

[0072] In this embodiment of the invention, the auxiliary detection line 5 may be located in one of the first metal layer 14, the second metal layer 17, the third metal layer 19, or the fourth metal layer 21, and the main detection line 4 may also be located in one of the first metal layer 14, the second metal layer 17, the third metal layer 19, or the fourth metal layer 21.

[0073] For example, when the auxiliary detection line 5 and the main detection line 4 are set on the same layer, in one configuration, see [reference needed]. Figure 8 Both the auxiliary detection line 5 and the main detection line 4 are located in the first metal layer 14. Alternatively, in another configuration, such as... Figure 11 As shown, Figure 11 This is another schematic diagram showing the film layer positions of the main detection line 4 and the auxiliary detection line 5 provided in an embodiment of the present invention. Both the auxiliary detection line 5 and the main detection line 4 are located in the second metal layer 17. Alternatively, in another configuration, such as... Figure 12 As shown, Figure 12 This is another schematic diagram of the film layer positions of the main detection line 4 and the auxiliary detection line 5 provided in an embodiment of the present invention. Both the auxiliary detection line 5 and the main detection line 4 are located in the third metal layer 19.

[0074] When the auxiliary detection line 5 and the main detection line 4 are set in different layers, in one configuration, see [reference needed]. Figure 9 The auxiliary detection line 5 is located in the first metal layer 14, and the main detection line 4 is located in the third metal layer 19, or see [link to relevant documentation]. Figure 10 The auxiliary detection line 5 is located in the first metal layer 14, and the main detection line 4 is located in the second metal layer 17. Alternatively, in another configuration, such as... Figure 13 As shown, Figure 13 This is another schematic diagram of the film layer positions of the main detection line 4 and the auxiliary detection line 5 provided in an embodiment of the present invention. The auxiliary detection line 5 is located in the second metal layer 17, and the main detection line 4 is located in the third metal layer 19. In this case, the two metal layers containing the auxiliary detection line 5 and the main detection line 4 are adjacent, and there are no other metal layers or semiconductor layers 13 separating the auxiliary detection line 5 and the main detection line 4. Figure 6 At this point, the drilling depth of the first via 10 and the second via 11 between the auxiliary detection line 5 and the main detection line 4 can be reduced, thereby improving the connection reliability between the two.

[0075] In addition, it should be noted that the metal materials used in different metal layers can be different, and thus, when the main detection line 4 and the auxiliary detection line 5 are arranged in different layers, the resistivity difference between the metal materials used in the main detection line 4 and the auxiliary detection line 5 can be used to adjust the resistance of the main detection line 4 and the auxiliary detection line 5.

[0076] In a possible implementation, as shown in FIG. 1, Figure 14 Figure 14 In another top view of the display panel provided by the embodiments of the present application, the auxiliary detection line 5 includes at least two sub-auxiliary lines 25 arranged in parallel, and the distance between the orthographic projections of the adjacent two sub-auxiliary lines 25 on the plane of the display panel is greater than 0.

[0077] In the above arrangement, the auxiliary detection line 5 itself also constitutes a parallel structure. When none, one or all of the sub-auxiliary lines 25 in the auxiliary detection line 5 are broken, the overall resistance of the auxiliary detection line 5 is different, and thus the influence on the overall resistance of the crack detection line 3 is also different.

[0078] Based on this, when the first preset resistance of the crack detection line 3 is calculated in advance, the resistance of the crack detection line 3 when a different sub-auxiliary line 25 in each auxiliary detection line 5 is broken can also be calculated. When the actual resistance of the crack detection line 3 matches the first preset resistance corresponding to the breaking of one sub-auxiliary line 25 in a certain auxiliary detection line 5, it indicates that the position of the crack is the position of the auxiliary detection line 5, and the crack has only extended a short distance inward, and the crack is slightly far from the display area 1. When the actual resistance of the crack detection line 3 matches the first preset resistance corresponding to the breaking of two sub-auxiliary lines 25 in a certain auxiliary detection line 5, it indicates that the position of the crack is the position of the auxiliary detection line 5, and the crack has extended a large distance inward, and the crack is close to the display area 1. In this way, not only can the position of the crack be judged, but also the extension distance of the crack inward can be judged, and thus more information of the crack can be obtained, and thus a more perfect process analysis can be made.

[0079] In addition, it should be noted that the sub-auxiliary lines 25 in the auxiliary detection line 5 can be arranged in the same layer or in different layers. For example, the sub-auxiliary lines 25 in the auxiliary detection line 5 are located in at least two metal layers, and the sub-auxiliary line 25 farthest from the main detection line 4 is closer to the substrate 9.

[0080] In a possible implementation, as shown in FIG. 1, Figure 15 Figure 15 In another top view of the display panel provided by the embodiments of the present application, the auxiliary detection line 5 is located on the side of the main detection line 4 close to the display area 1.​​

[0081] Since the crack is mostly generated at the edge of the display panel and extends from outside to inside, when the main detection line 4 is located at the side of the auxiliary detection line 5 far away from the display area 1, the main detection line 4 will first perceive the crack and break, i.e. the above structure is to detect the position of the crack based on whether the main wire segment 8 is broken.

[0082] When the crack detection line 3 includes a plurality of main wire segments 8, the crack detection line 3 correspondingly includes a plurality of auxiliary detection lines 5.

[0083] In one setting mode of the embodiment, the resistances of different main wire segments 8 are different, and the resistances of different auxiliary detection lines 5 can be the same. For example, when designing the main wire segment 8, the different main wire segments 8 are formed by using the same patterning process, at this time, the film thickness and the line width of the different main wire segments 8 can be the same, and the lengths of the different main wire segments 8 are different from each other, so that the resistances of the different main wire segments 8 are different. When designing the auxiliary detection line 5, when the lengths of the different auxiliary detection lines 5 are fixed, the resistances of the different auxiliary detection lines 5 can be the same by adjusting the line width and / or the film thickness of the different auxiliary detection lines 5. At this time, the influence degrees of the resistances of the different main wire segments 8 on the overall resistance of the crack detection line 3 are different, and the crack detection line 3 has different resistances when the different main wire segments 8 break.

[0084] Alternatively, in another setting mode of the embodiment, the resistances of the different main wire segments 8 are the same, but the resistances of the different auxiliary detection lines 5 are different. For example, the lengths of the different main wire segments 8 are the same, so that the resistances of the different main wire segments 8 are the same, and the lengths of the different auxiliary detection lines 5 are the same but the line widths and / or the film thicknesses are different, so that the resistances of the different auxiliary detection lines 5 are different. At this time, when the main wire segment 8 at a certain position breaks, only the auxiliary detection line 5 in the parallel structure remains, and the auxiliary detection line 5 is regarded as being connected in series with other parallel structures, and since the resistances of the different auxiliary detection lines 5 are different, the overall resistance of the crack detection line 3 when the different auxiliary detection lines 5 are connected in series is different, i.e. the overall resistance of the crack detection line 3 when the different main wire segments 8 break is different.

[0085] Based on this, the embodiment of the present application calculates the first preset resistance of the crack detection line 3 when calculating the preset resistance of the crack detection line 3, and the first preset resistance can include the resistance of the crack detection line 3 when any i main wire segments 8 are broken, i is sequentially 1, 2, 3, …, x, and x is the number of the main wire segments 8 included in the crack detection line 3. Taking x=3 as an example, the first preset resistance can include the resistance of the crack detection line 3 when the first main wire segment 8 is broken, the resistance of the crack detection line 3 when the second main wire segment 8 is broken, the resistance of the crack detection line 3 when the third main wire segment 8 is broken, the resistance of the crack detection line 3 when the first and second main wire segments 8 are broken, the resistance of the crack detection line 3 when the second and third main wire segments 8 are broken, the resistance of the crack detection line 3 when the first and third main wire segments 8 are broken, and the resistance of the crack detection line 3 when all the three main wire segments 8 are broken.

[0086] When detecting the crack, the actual resistance of the crack detection line 3 is compared with the first preset resistance calculated in advance, and when the actual resistance matches one of the first preset resistances, the first preset resistance matched can be used to know which main wire segment 8 or which main wire segments 8 are broken, and then the position of the crack can be known.

[0087] In the embodiment of the present application, the resistance of the auxiliary detection line 5 and the main wire segment 8 connected in parallel therewith can also be the same, but the resistances of different auxiliary detection lines 5 are different from each other. At this time, in the parallel structure composed of the auxiliary detection line 5 and the main wire segment 8, whether the auxiliary detection line 5 is broken or the main wire segment 8 is broken, the influence on the overall resistance of the crack detection line 3 is consistent, so the setting position of the auxiliary detection line 5 can be more flexible, for example, part of the auxiliary detection line 5 can be set on the side of the main detection line 4 close to the display area 1, and the remaining part of the auxiliary detection line 5 can be set on the side of the main detection line 4 away from the display area 1 according to the wiring design of the non-display area.

[0088] In a feasible implementation manner, referring again to Figure 2 , the auxiliary detection line 5 includes a first auxiliary detection line 26 and a second auxiliary detection line 27, and the resistances of the first auxiliary detection line 26 and the second auxiliary detection line 27 are different.

[0089] The auxiliary detection line 5 is located on the side of the main detection line 4 away from the display area 1, and the auxiliary detection line 5 is used to determine the crack position. When the resistances of the first auxiliary detection line 26 and the second auxiliary detection line 27 are different, the influence degrees of the resistances of the first auxiliary detection line 26 and the second auxiliary detection line 27 on the overall resistance of the crack detection line 3 are different. Therefore, when the first preset resistance of the crack detection line 3 is calculated in advance, the first preset resistance corresponding to the first auxiliary detection line 26 being broken, the first preset resistance corresponding to the second auxiliary detection line 27 being broken, and the first preset resistance corresponding to the first auxiliary detection line 26 and the second auxiliary detection line 27 being broken are obviously different. Therefore, when the actual resistance of the crack detection line 3 is compared with the plurality of first preset resistances, it can be accurately determined whether the crack is generated at the position of the first auxiliary detection line 26, the position of the second auxiliary detection line 27, or the positions of the first auxiliary detection line 26 and the second auxiliary detection line 27.

[0090] Further, referring again to Figure 2 , the lengths of the first auxiliary detection line 26 and the second auxiliary detection line 27 are different. Therefore, when the parameters such as the line width and the film thickness are unchanged, the resistances of the first auxiliary detection line 26 and the second auxiliary detection line 27 can be adjusted by using the length difference between the first auxiliary detection line 26 and the second auxiliary detection line 27, so that the first auxiliary detection line 26 and the second auxiliary detection line 27 have different resistances.

[0091] and / or, as shown in Figure 16 , Figure 16 is another top view of the display panel provided by the embodiment of the application, the line width of the first auxiliary detection line 26 is different from the line width of the second auxiliary detection line 27. Therefore, when the parameters such as the length and the film thickness are unchanged, the resistances of the first auxiliary detection line 26 and the second auxiliary detection line 27 can be adjusted by using the line width difference between the first auxiliary detection line 26 and the second auxiliary detection line 27, so that the first auxiliary detection line 26 and the second auxiliary detection line 27 have different resistances.

[0092] and / or, as shown in Figure 17 and Figure 18 , Figure 17 is another top view of the display panel provided by the embodiment of the application, Figure 18 is Figure 17 is a sectional view along the C1-C2 direction, the film thickness of the first auxiliary detection line 26 is different from the film thickness of the second auxiliary detection line 27. Therefore, when the parameters such as the length and the line width are unchanged, the resistances of the first auxiliary detection line 26 and the second auxiliary detection line 27 can be adjusted by using the film thickness difference between the first auxiliary detection line 26 and the second auxiliary detection line 27, so that the first auxiliary detection line 26 and the second auxiliary detection line 27 have different resistances.

[0093] Further, it should be noted that, when the first auxiliary detection line 26 and the second auxiliary detection line 27 are made to have resistance difference by adjusting the line width and / or the film thickness of the first auxiliary detection line 26 and the second auxiliary detection line 27, referring to Figure 17 , the first auxiliary detection line 26 and the second auxiliary detection line 27 can each have a smaller length, and thus, when the length of the main detection line 4 is constant, a larger number of auxiliary detection lines 5 can be arranged on the main detection line 4, and thus, the position of the crack can be more accurately determined.

[0094] In a feasible implementation, as shown in Figures 19-21 , Figure 19 is another top view of the display panel provided by the embodiment of the present application, Figure 20 is Figure 19 a sectional view along the direction of D1-D2, Figure 21 is Figure 19 another sectional view along the direction of D1-D2, the display panel further comprises a crack blocking structure 28, which is located between the auxiliary detection line 5 and the main detection line 4 in the direction perpendicular to the plane on which the display panel is located.

[0095] In one arrangement, referring to Figure 20 , the insulating layer 12 and the crack blocking structure 28 on the side of the substrate 9 of the auxiliary detection line 5 and the main detection line 4 are arranged in communication, and at this time, the insulating layer 12 and the crack blocking structure 28 can be formed by the same patterning process through an etching process. Alternatively, in another arrangement, referring to Figure 21 , the crack blocking structure 28 and the insulating layer 12 are independent of each other, and the crack blocking structure 28 can be formed separately by an additional patterning process.

[0096] By arranging the crack blocking structure 28 between the auxiliary detection line 5 and the main detection line 4, when the display panel has a crack, the crack blocking structure 28 not only can effectively block the crack from further extending to the display area 1, but also can reduce the risk of the auxiliary detection line 5 and the main detection line 4 being broken at the same time, and improve the reliability of crack detection.

[0097] Further, the crack blocking structure 28 can comprise an inorganic material, so that the crack blocking structure 28 has a better crack blocking effect.

[0098] In a feasible implementation, referring to Figure 2 , the crack detection line 3 comprises a plurality of auxiliary detection lines 5, the plurality of auxiliary detection lines 5 are arranged at intervals along the extension direction of the main detection line 4, and the distance d between the adjacent two auxiliary detection lines 5 in the arrangement direction is greater than or equal to 2 μm, thereby avoiding the case that the adjacent auxiliary detection lines 5 are connected due to process precision and the like, and improving the accuracy of crack position detection.

[0099] In an implementation, as shown in Figure 22 , Figure 22 Another top view of the display panel provided by the embodiment of the present application, the non-display area 2 includes a straight area 29 and a corner area 30, the corner area 30 is in communication with the straight area 29, and part of the auxiliary detection line 5 is located in the corner area 30.

[0100] Compared with the straight area 29, the corner area 30 is more likely to have uneven stress changes when the display panel is subjected to a process such as 3D bonding, and thus the corner area 30 is more likely to have cracks. In this regard, the embodiment of the present application can detect whether cracks occur in the corner area 30 and the positions where the cracks occur by arranging the auxiliary detection line 5 in the corner area 30, thereby helping to confirm the process capability of the corner area 30 and subsequent process analysis and optimizing the performance of the corner area 30.

[0101] Further, as shown in Figure 23 , Figure 23 A partial schematic view of the display panel provided by the embodiment of the present application, the auxiliary detection line 5 includes a first type of auxiliary detection line 31 located in the straight area 29 and a second type of auxiliary detection line 32 located in the corner area 30. In the straight area 29, at least two first type of auxiliary detection lines 31 are arranged at intervals along the extension direction of the main detection line 4, and in the corner area 30, at least two second type of auxiliary detection lines 32 are arranged at intervals along the extension direction of the main detection line 4. The minimum distance h1 between adjacent two second type of auxiliary detection lines 32 along the arrangement direction thereof is less than the minimum distance h2 between adjacent two first type of auxiliary detection lines 31 along the arrangement direction thereof.

[0102] Generally, a large number of metal traces are arranged in the corner area 30, for example, a large number of fan-out traces need to be arranged in the corner area 30 of the lower bezel, and thus if cracks occur in the corner area 30, more metal traces are likely to be broken. In this regard, the embodiment of the present application can more accurately detect the positions where cracks occur in the corner area 30 by arranging the auxiliary detection line 5 in the corner area 30 more densely, thereby helping to subsequently develop more comprehensive process analysis for the corner area 30.

[0103] Based on the same inventive concept, the embodiment of the present application also provides a crack detection method for a display panel, which is combined with Figure 1 and Figure 2 The display panel includes a display area 1 and a non-display area 2, the non-display area 2 includes a crack detection line 3, the crack detection line 3 includes a main detection line 4 and at least one auxiliary detection line 5, the main detection line 4 surrounds the display area 1, the auxiliary detection line 5 includes a first end portion 6 and a second end portion 7, and the first end portion 6 and the second end portion 7 are respectively connected to the main detection line 4.

[0104] As Figure 24 shown, Figure 24 is a flow chart of the crack detection method provided by the embodiment of the present application, and the crack detection method comprises:

[0105] Step S1: obtaining a first preset resistance, the first preset resistance being a resistance possessed by the crack detection line 3 when the auxiliary detection line 5 or the main wire segment 8 breaks, wherein the main wire segment 8 is a part of the main detection line 4 which is arranged in parallel with the auxiliary detection line 5.

[0106] Step S2: detecting the actual resistance of the crack detection line 3, and judging whether the actual resistance matches the first preset resistance, if yes, it is judged that the display panel has a crack, and the crack generation position is the position where the auxiliary detection line 5 or the main wire segment 8 is located.

[0107] In combination with the foregoing analysis, by using the crack detection method provided by the embodiment of the present application, when crack detection is performed, the actual resistance of the crack detection line 3 obtained by detection is compared with the first preset resistance possessed by the crack detection line 3 when the auxiliary detection line 5 or the main wire segment 8 breaks, which is obtained in advance, so as to judge whether the auxiliary detection line 5 or the main wire segment 8 located position breaks, if it is judged that the auxiliary detection line 5 or the main wire segment 8 located position breaks, the auxiliary detection line 5 or the main wire segment 8 located position is the crack generation position, thereby realizing accurate judgment of the crack generation position, and subsequent process capability and subsequent process analysis can be confirmed according to the crack generation position, which is helpful for subsequent improvement and repair of the display panel.

[0108] In a feasible implementation manner, in combination with Figure 2 , the crack detection line 3 comprises x auxiliary detection lines 5, and the x auxiliary detection lines 5 are located on the side of the main detection line 4 away from the display area 1. The resistances of the x auxiliary detection lines 5 can be different from each other.

[0109] Based on this, the first preset resistance comprises a resistance possessed by the crack detection line 3 when any i auxiliary detection line 5 breaks, and i takes values 1, 2, …, x in turn.

[0110] The above detection method is based on whether the auxiliary detection lines 5 are broken to detect the crack generation position. Taking x=3 as an example, the first preset resistance can include: the resistance of the crack detection line 3 when the first auxiliary detection line 5 is broken, the resistance of the crack detection line 3 when the second auxiliary detection line 5 is broken, the resistance of the crack detection line 3 when the third auxiliary detection line 5 is broken, the resistance of the crack detection line 3 when the first and second auxiliary detection lines 5 are broken, the resistance of the crack detection line 3 when the second and third auxiliary detection lines 5 are broken, the resistance of the crack detection line 3 when the first and third auxiliary detection lines 5 are broken, and the resistance of the crack detection line 3 when all the three auxiliary detection lines 5 are broken.

[0111] The above method pre-calculates the resistance of the crack detection line 3 when any part of the auxiliary detection line 5 is broken, so even if multiple cracks in the display panel cause multiple auxiliary detection lines 5 to break, one of the preset multiple first preset resistances corresponding to the actual resistance can be matched, and then the breaking of the auxiliary detection line 5 can be known according to the first preset resistance, and the number and position of the cracks can be known.

[0112] Further, as shown in Figure 25 , Figure 25 Another flowchart of the crack detection method provided by the embodiment of the application, step S1 can specifically include:

[0113] Step S11: Obtain the resistance range of the auxiliary detection line 5 according to the design parameters and process parameters of the auxiliary detection line 5. The design parameters can include theoretical design parameters such as the film thickness, line width, and length of the auxiliary detection line 5, and the process parameters can include process accuracy such as alignment error and other parameters.

[0114] Step S12: Obtain the numerical range of the first preset resistance according to the resistance range of the auxiliary detection line 5.

[0115] In the process of the auxiliary detection line 5, the actual values such as the line width and film thickness of the auxiliary detection line 5 may differ from the theoretically designed values due to factors such as process accuracy, thereby causing differences between the actual resistance and the theoretically designed resistance of the auxiliary detection line 5. For this, the embodiment of the application calculates a numerical range that the resistance of the auxiliary detection line 5 can have by comprehensively considering the design parameters and process parameters of the auxiliary detection line 5, and then expands the first preset resistance to a numerical range according to the numerical range. When the actual resistance detected subsequently is within the numerical range of the first preset resistance, it can be judged that the actual resistance matches the first preset resistance, which can reduce the risk that the actual resistance and the first preset resistance cannot match due to factors such as process error.

[0116] Further, in combination Figure 2 , the auxiliary detection line 5 includes a first auxiliary detection line 26 and a second auxiliary detection line 27.

[0117] When the first auxiliary detection line 26 is broken, the minimum value of the acquired first preset resistance range is r1 and the maximum value is r2; when the second auxiliary detection line 27 is broken, the minimum value of the acquired first preset resistance range is r3 and the maximum value is r4; and when both the first auxiliary detection line 26 and the second auxiliary detection line 27 are broken, the minimum value of the acquired first preset resistance range is r5 and the maximum value is r6. Wherein, r1>r4 and r5>r2.

[0118] That is, when the first auxiliary detection line 26 is broken, the corresponding first preset resistance is between r1 and r2; when the second auxiliary detection line 27 is broken, the corresponding first preset resistance is between r3 and r4; and when both the first auxiliary detection line 26 and the second auxiliary detection line 27 are broken, the corresponding first preset resistance is between r5 and r6. By making r1>r4 and r5>r2, there is no overlapping interval among the three value ranges of r1-r2, r3-r4 and r5-r6. Further, the actual resistance is at most located in a certain first preset resistance value range, avoiding the situation that the actual resistance matches two first preset resistance value ranges.

[0119] In a feasible implementation, in combination Figure 15 , the crack detection line 3 includes x auxiliary detection lines 5, and the x auxiliary detection lines 5 are located on the side of the main detection line 4 close to the display area 1. Wherein, the resistances of the x auxiliary detection lines 5 can be different from each other.

[0120] Based on this, the first preset resistance includes the resistance of the crack detection line 3 when any i main wire segments 8 are broken, and i takes values 1, 2, …, x in turn.

[0121] The above detection method is based on whether the main wire segment 8 is broken to detect the position where the crack is generated. Taking x=3 as an example, the first preset resistance can include: the resistance of the crack detection line 3 when the first main wire segment 8 is broken, the resistance of the crack detection line 3 when the second main wire segment 8 is broken, the resistance of the crack detection line 3 when the third main wire segment 8 is broken, the resistance of the crack detection line 3 when the first and second main wire segments 8 are broken, the resistance of the crack detection line 3 when the second and third main wire segments 8 are broken, the resistance of the crack detection line 3 when the first and third main wire segments 8 are broken, and the resistance of the crack detection line 3 when all the three main wire segments 8 are broken.

[0122] The above method pre-calculates the resistance of the crack detection line 3 when any part of the main line segment 8 breaks. Therefore, even if the display panel has multiple cracks that cause multiple main line segments 8 to break, one of the preset first preset resistors can be matched with the actual resistance. Then, based on the first preset resistor, the breakage of the main line segment 8 can be known, and the number and location of the cracks can be known.

[0123] In one feasible implementation, the crack detection method further includes: obtaining a second preset resistance, the second preset resistance being the resistance of the crack detection line 3 when neither the auxiliary detection line 5 nor the main routing line 8 has broken; when the actual resistance of the crack detection line 3 is detected, determining whether the actual resistance matches the second preset resistance, and if so, determining that there is no crack in the display panel.

[0124] By obtaining the second preset resistance and comparing whether the actual resistance matches the second preset resistance, it is also possible to identify cases where neither the auxiliary detection line 5 nor the main routing line 8 has broken, thus providing a more comprehensive crack detection result.

[0125] It should be noted that, in this embodiment of the invention, the second preset resistance can also be a numerical range. For example, the numerical range of the resistance of the auxiliary detection line 5 can be obtained based on the design parameters and process parameters of the auxiliary detection line 5, and then the numerical range of the second preset resistance can be obtained based on this numerical range.

[0126] Furthermore, the numerical range of the second preset resistor does not overlap with the numerical range of any of the first preset resistors. For example, if the minimum value of the numerical range of the second preset resistor is r7 and the maximum value is r8, r3 can be greater than r8, so that the four numerical ranges r1~r2, r3~r4, r5~r6 and r7~r8 do not overlap.

[0127] Based on the same inventive concept, embodiments of the present invention also provide a display device, such as... Figure 26 As shown, Figure 26 This is a schematic diagram of a display device provided in an embodiment of the present invention. The display device includes the display panel 100 described above. The specific structure of the display panel 100 has been described in detail in the above embodiments and will not be repeated here. Figure 26 The display device shown is for illustrative purposes only. The display device can be any electronic device with display function, such as a mobile phone, tablet computer, laptop computer, e-reader or television.

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display panel, characterized by, The display panel comprises: a display area and a non-display area; a crack detection line located in the non-display area, the crack detection line comprising a main detection line and at least one auxiliary detection line, the main detection line surrounding the display area, the auxiliary detection line comprising a first end and a second end, the first end and the second end being connected to the main detection line respectively; the non-display area comprising a straight area and a corner area, the corner area being in communication with the straight area, part of the auxiliary detection line being located in the corner area; the auxiliary detection line comprising a first type of auxiliary detection line located in the straight area and a second type of auxiliary detection line located in the corner area, in the straight area, at least two first type of auxiliary detection lines being arranged in a spaced manner along the extension direction of the main detection line, in the corner area, at least two second type of auxiliary detection lines being arranged in a spaced manner along the extension direction of the main detection line; the minimum distance between two adjacent second type of auxiliary detection lines in the arrangement direction thereof is smaller than the minimum distance between two adjacent first type of auxiliary detection lines in the arrangement direction thereof.

2. The display panel of claim 1, wherein the auxiliary detection line is located on the side of the main detection line away from the display area.

3. The display panel of claim 2, wherein the line width of the auxiliary detection line is smaller than or equal to the line width of the main detection line.

4. The display panel of claim 2, wherein the display panel comprises a substrate, and the distance between the auxiliary detection line and the substrate in the direction perpendicular to the plane in which the substrate lies is smaller than or equal to the distance between the main detection line and the substrate.

5. The display panel of claim 4, wherein the display panel further comprises a semiconductor layer and a first metal layer, the first metal layer being located between the semiconductor layer and the substrate, and the auxiliary detection line is located in the first metal layer.

6. The display panel of claim 2, wherein the auxiliary detection line comprises at least two sub-auxiliary lines arranged in parallel, and the distance between the orthogonal projections of two adjacent sub-auxiliary lines on the plane in which the display panel lies is greater than 0.

7. The display panel of claim 1, wherein the auxiliary detection line is located on the side of the main detection line close to the display area.

8. The display panel of claim 1, wherein the auxiliary detection line comprises a first auxiliary detection line and a second auxiliary detection line, and the resistances of the first auxiliary detection line and the second auxiliary detection line are different.

9. The display panel of claim 8, wherein the lengths of the first auxiliary detection line and the second auxiliary detection line are different, and / or the line widths of the first auxiliary detection line and the second auxiliary detection line are different, and / or the film thicknesses of the first auxiliary detection line and the second auxiliary detection line are different.

10. The display panel of claim 1, wherein The display panel further comprises a crack barrier structure, which is located between the auxiliary detection line and the main detection line in a direction perpendicular to a plane in which the display panel is located.

11. The display panel of claim 10, wherein, The crack barrier structure comprises an inorganic material.

12. The display panel of claim 1, wherein, The crack detection line comprises a plurality of auxiliary detection lines, the plurality of auxiliary detection lines are arranged at intervals along an extension direction of the main detection line, and a distance between two adjacent auxiliary detection lines in the arrangement direction is greater than or equal to 2 μm.

13. A crack detection method for a display panel, comprising: The display panel comprises a display area and a non-display area, the non-display area comprises a crack detection line, the crack detection line comprises a main detection line and at least one auxiliary detection line, the main detection line surrounds the display area, the auxiliary detection line comprises a first end and a second end, and the first end and the second end are connected to the main detection line respectively; the non-display area comprises a straight line area and a corner area, the corner area is in communication with the straight line area, and part of the auxiliary detection line is located in the corner area; the auxiliary detection line comprises a first type of auxiliary detection line located in the straight line area and a second type of auxiliary detection line located in the corner area, at least two first type of auxiliary detection lines are arranged at intervals along an extension direction of the main detection line in the straight line area, and at least two second type of auxiliary detection lines are arranged at intervals along the extension direction of the main detection line in the corner area; a minimum distance between two adjacent second type of auxiliary detection lines in the arrangement direction is less than a minimum distance between two adjacent first type of auxiliary detection lines in the arrangement direction; The crack detection method comprises: Obtaining a first preset resistance, the first preset resistance being a resistance of the crack detection line when a crack occurs in the auxiliary detection line or a main wire segment, wherein the main wire segment is a part of the main detection line that is arranged in parallel with the auxiliary detection line; Detecting an actual resistance of the crack detection line, and determining whether the actual resistance matches the first preset resistance, if yes, it is determined that the display panel has a crack, and a position of the crack is a position of the auxiliary detection line or the main wire segment.

14. The crack detection method of claim 13, wherein, The crack detection line comprises x auxiliary detection lines, and the x auxiliary detection lines are all located on a side of the main detection line away from the display area. The first preset resistance comprises a resistance of the crack detection line when any i auxiliary detection lines are cracked, i being 1, 2, …, x in turn.

15. The crack detection method according to claim 14, characterized by, The process of obtaining the first preset resistance comprises: Obtaining a resistance range of the auxiliary detection line according to design parameters and process parameters of the auxiliary detection line; Obtaining a numerical range of the first preset resistance according to the resistance range of the auxiliary detection line.

16. The crack detection method of claim 15, wherein, The auxiliary detection lines include a first auxiliary detection line and a second auxiliary detection line; When the first auxiliary detection line is broken, the minimum value of the range of the first preset resistance is r1 and the maximum value is r2; when the second auxiliary detection line is broken, the minimum value of the range of the first preset resistance is r3 and the maximum value is r4; when both the first auxiliary detection line and the second auxiliary detection line are broken, the minimum value of the range of the first preset resistance is r5 and the maximum value is r6; Wherein, r1>r4, r5>r2.

17. The crack detection method of claim 13, wherein, The crack detection lines include x auxiliary detection lines, and the x auxiliary detection lines are located on one side of the main detection line close to the display area. The first preset resistance includes the resistance of the crack detection line when any i main wire segments are broken, and i is sequentially taken as 1, 2, …, x.

18. The crack detection method of claim 13, wherein, The crack detection method further includes: Obtaining a second preset resistance, the second preset resistance being the resistance of the crack detection line when neither the auxiliary detection line nor the main wire segment is broken; When the actual resistance of the crack detection line is detected, it is judged whether the actual resistance matches the second preset resistance, and if so, it is judged that the display panel does not have a crack.

19. A display device comprising: The display panel includes any one of claims 1-12.

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