Display panel and display device

Abstract

The invention provides a display panel and a display device, the display panel comprises a bending area and non-bending areas located on the two opposite sides of the bending area in the first direction, and the display panel further comprises a substrate and a crack detection circuit located on the substrate. The crack detection circuit includes a first detection line that spans the bent region and the non-bent region in a first direction. Wherein the first detection line at least comprises a first wire and a second wire which are connected in parallel, and the first wire and the second wire are arranged at an interval in the thickness direction of the display panel. As the first wire and the second wire are connected in parallel and are arranged at intervals in the thickness direction of the display panel, when one wire is fractured, the impedance is small, and when the two wires are fractured, the impedance is large, so that the fracture severity of the first detection wire can be evaluated through the impedance sub-gears; therefore, the severity of the crack generated at the corresponding position of the display panel is reflected, and the severity of the crack of the display panel is evaluated.

Description

Technical Field

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

[0002] Active-matrix organic light-emitting diode (AMOLED) display panels are becoming the next-generation display technology due to their high contrast, wide color gamut, and low power consumption. As end customers expand their application scenarios for screens, flexible, foldable screens (hereafter referred to as Dynamic Fold screens) are becoming a hot topic of competition among screen manufacturers. Due to the added flexibility of screens, screen manufacturers need to conduct additional bending tests to assess whether the screens meet usage standards.

[0003] In existing display panel bending test, once the detection line breaks, the impedance becomes infinite, making it impossible to assess the severity or risk of cracks caused by bending the display panel. Summary of the invention

[0004] The purpose of this application is to provide a display panel and a display device, aiming to evaluate the severity of cracks in the display panel.

[0005] An embodiment of the present application provides a display panel, which includes a bending area and non-bending areas located on opposite sides of the bending area in a first direction. The display panel includes: a substrate; a crack detection circuit located on the substrate, the crack detection circuit including a first detection line, the first detection line spanning the bending area and the non-bending area along the first direction; wherein the first detection line includes at least a first line and a second line connected in parallel, and the first line and the second line are spaced apart in the thickness direction of the display panel.

[0006] In some embodiments, the first routing line has a first head end and a first end, the second routing line has a second head end and a second end, and the second head end and the first head end are located at the same end of the first detection line; the crack detection circuit further includes: a first connecting line and a second connecting line, which are located on a side of the first routing line and the second routing line away from the substrate; wherein the first connecting line connects the first head end and the second head end, and the second connecting line connects the first end and the second end.

[0007] In some embodiments, the first detection line further includes: a third trace, connected in parallel with the first trace and the second trace; wherein, the third trace has a third leading end and a third trailing end, and the third leading end and the first leading end are located at the same end of the first detection line; the first connection line connects the third leading end, the second leading end and the first leading end, and the second connection line connects the third trailing end, the second trailing end and the third trailing end.

[0008] In some embodiments, the first trace, the second trace and the third trace are all arranged on different layers, and the first trace, the second trace and the third trace are overlapped in the thickness direction.

[0009] In some embodiments, the first detection line includes: a first line segment group, located in the bending area, the first line segment group includes a plurality of straight line segments extending along the first direction and spaced apart along the second direction, and adjacent two of the straight line segments are connected in series at the head and tail, and the second direction is perpendicular to the first direction; a second line segment group, located in the non-bending area and connected to the first line segment group.

[0010] In some embodiments, the dimension of the first line segment group in the second direction is greater than the dimension of the second line segment group in the second direction.

[0011] In some embodiments, the crack detection circuit further includes: a second detection line, spanning the bending area and the non-bending area along the first direction, and arranged in parallel with and connected in series with the first detection line; wherein, the second detection line has a fourth leading end and a fourth trailing end, the distance from the fourth leading end to the first leading end is less than the distance from the fourth trailing end to the first leading end, and the fourth leading end is connected to the first connection line.

[0012] In some embodiments, the display panel includes a display area, a first side area and a second side area, the first side area and the second side area are located on opposite sides of the display area in the second direction, and the second direction is perpendicular to the first direction; the first detection line is located in the first side area and the second side area, and the second detection line is located in the first side area and the second side area; the first detection line in the first side area is connected in series with the second detection line in the first side area; the first detection line in the second side area is connected in series with the second detection line in the second side area.

[0013] In some embodiments, the crack detection circuit further includes: a first detection terminal connected to the first detection line in the first side region; a second detection terminal connected to the first detection line in the second side region; wherein, the fourth end of the second detection line in the first side region is electrically connected to the fourth end of the second detection line in the second side region.

[0014] In some embodiments, the crack detection circuit further includes: a third detection line having a fifth first end and a fifth end, the fifth first end being connected to the fourth end of the second detection line in the first side region, and the fifth end being connected to the fourth end of the second detection line in the second side region.

[0015] In some embodiments, the third detection line, the second detection line, and the first detection line are disposed on different layers.

[0016] In some embodiments, the display panel further includes a third side region and a fourth side region, the third side region and the fourth side region are respectively located on opposite sides of the display region in the first direction, the fifth first end and the fifth end are located in the fourth side; the display region includes an opening region, and the distance from the opening region to the third side region is less than the distance from the opening region to the fourth side region; the third detection line extends in the first side region, the third side region, and the second side region, and is disposed around the opening region.

[0017] An embodiment of the present application further provides a display device including the display panel in any one of the above embodiments.

[0018] In the display panel provided by the embodiment of the present application, the first detection line spans the bending region and the non-bending region. Therefore, the crack caused by the bending of the display panel can be detected through the breakage of the first detection line. Since the first trace and the second trace are connected in parallel and are spaced apart in the thickness direction of the display panel, the impedance is smaller when one of the traces is broken, and the impedance is larger when both traces are broken. Therefore, the severity of the breakage of the first detection line can be evaluated by impedance grading, thereby reflecting the severity of the crack generated in the corresponding position of the display panel, and realizing the evaluation of the severity of the crack of the display panel. Description of the Drawings

[0019] Combined with the following drawings, through the detailed description of the specific embodiments of the present application, the technical solutions and other beneficial effects of the present application will be obvious.

[0020] Figure 1 is a top view structural schematic diagram of a display panel provided by some embodiments of the present application;

[0021] Figure 2 is Figure 1Schematic cross-sectional structure diagram of the first detection line at position A;

[0022] Figure 3 is Figure 1 Schematic cross-sectional structure diagram of the display panel at C-C1;

[0023] Figure 4 is Figure 1 Local enlarged view at E;

[0024] Figure 5 Schematic structural diagram of a display device provided by some embodiments of the present application. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0026] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0027] In the present application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0028] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0029] In one embodiment, a detection line may be provided at the edge of the display panel, and the detection line is a single layer. By providing a Panel Crack Detection (PCD) circuit in the display panel, when performing a bending test, the impedance between the terminals at both ends of the detection line can be measured by probing to determine whether a Crack occurs. If it occurs, the impedance is infinite. Such a crack detection circuit cannot evaluate the severity of the crack in the display panel.

[0030] Based on this, an embodiment of the present application provides a display panel, including a bending area and non-bending areas on opposite sides of the bending area in a first direction. The display panel includes: a substrate; a crack detection circuit located on the substrate, the crack detection circuit including a first detection line that spans the bending area and the non-bending area along the first direction; wherein, the first detection line at least includes a first trace and a second trace connected in parallel, and the first trace and the second trace are spaced apart in the thickness direction of the display panel.

[0031] In the display panel provided by the present application, the first detection line spans the bending area and the non-bending area. Therefore, the crack caused by the bending of the display panel can be detected by the breakage of the first detection line. Since the first trace and the second trace are connected in parallel and are spaced apart in the thickness direction of the display panel, when one of the traces is broken, the impedance is small, and when both traces are broken, the impedance is large. Therefore, the severity of the breakage of the first detection line can be evaluated by impedance grading, thereby reflecting the severity of the crack generated at the corresponding position of the display panel, and realizing the evaluation of the severity of the crack in the display panel.

[0032] The display panel provided by the embodiment of the present application is described below with reference to the accompanying drawings.

[0033] Please refer to Figure 1 and Figure 2 , Figure 1 is a top view structural schematic diagram of a display panel provided by some embodiments of the present application, Figure 2 is Figure 1Schematic cross-sectional structure diagram of the first detection line at position A.

[0034] The display panel 100 includes a bending area 100a and non-bending areas 100b located on opposite sides of the bending area 100a in the first direction X. The display panel 100 further includes a substrate 10 and a crack detection circuit 20. The crack detection circuit 20 is located on the substrate 10. The crack detection circuit 20 includes a first detection line 21, and the first detection line 21 spans the bending area 100a and the non-bending area 100b along the first direction X. Wherein, the first detection line 21 at least includes a first trace 211 and a second trace 212 connected in parallel, and the first trace 211 and the second trace 212 are spaced apart in the thickness direction Z of the display panel 100.

[0035] In some embodiments, the first direction X may be the long side direction of the display panel 100, that is, the up and down direction shown in the figure. Therefore, the non-bending areas 100b may be located on the upper and lower sides of the bending area 100a. The bending area 100a may extend in the second direction Y, and the second direction Y may be the short side direction of the display panel 100. Therefore, the non-bending areas 100b on the upper and lower sides of the display panel 100 may be symmetrically bent along the bending area 100a, and cracks may be generated in the display panel 100 (mainly in the bending area 100a) during the bending process.

[0036] Since the first detection line 21 spans the bending area 100a and the non-bending area 100b along the first direction X, during the bending process, the fracture condition of the first detection line 21 can reflect the crack condition of the display panel 100 in the bending area 100a, thereby reflecting the bending performance of the display panel 100.

[0037] In some embodiments, Mo metal with poorer toughness can be selected as the first detection line 21 and impedance detection can be performed, so that the bending performance of the display panel 100 can be reflected more sensitively. In other words, the material of the first detection line 21 may include molybdenum, and the materials of the first trace 211 and the second trace 212 may both be molybdenum.

[0038] The display panel 100 may include a thin film transistor area, and multiple thin film transistors may be provided in the thin film transistor area. The gate layers of each thin film transistor may be provided in different layers, and the gate layer may also be made of molybdenum metal.

[0039] In some embodiments, the first trace 211 and the second trace 212 are located in different layers in the thickness direction Z of the display panel 100, and the first trace 211 may be provided in the same layer as one of the gate layers, and the second trace 212 may be provided in the same layer as another one of the gate layers.

[0040] Figure 2 The cross-sectional structure of the first detection line 21 at position A is shown. Position A is one end of the first detection line 21. If position A is referred to as the first end of the first detection line 21, then the other end B of the first detection line 21 is the second end.

[0041] As Figure 2 shown, the first trace 211 has a first first end 211a and a first second end (not shown), the second trace 212 has a second first end 212a and a second second end (not shown), and the second first end 212a and the first first end 211a are located at the same end of the first detection line 21. Among them, the second first end 212a and the first first end 211a may both be located at the first end A of the first detection line 21. That is to say, the first end A of the first detection line 21 includes the first first end 211a of the first trace 211 and the second first end 212a of the second trace 212.

[0042] The crack detection circuit 20 may further include a first connection line CT and a second connection line (not shown). The first connection line CT and the second connection line are located on the side of the first trace 211 and the second trace 212 away from the substrate 10. That is to say, the first connection line CT and the second connection line are both on different layers from the first trace 211 and the second trace 212. Among them, the first connection line CT and the second connection line may be on the same layer and may be arranged on the same layer as the source-drain metal layer (which may be referred to as the first metal layer) of the thin-film transistor.

[0043] The first connection line CT connects the first first end 211a and the second first end 212a, and the second connection line connects the first second end and the second second end, so as to realize the parallel connection of the first trace 211 and the second trace 212 through the first connection line CT and the second connection line.

[0044] As Figure 2 shown, the first detection line 21 may further include a third trace 213, and the third trace 213 is connected in parallel with the first trace 211 and the second trace 212. Among them, the third trace 213 has a third first end 213a and a third second end (not shown), and the third first end 213a and the first first end 211a are located at the same end of the first detection line 21 (for example, both are located at the first end A of the first detection line 21). The first connection line CT connects the third first end 213a, the second first end 212a and the first first end 211a, and the second connection line connects the third second end, the second second end and the third second end, so as to realize the parallel connection of the first trace 211, the second trace 212 and the third trace 213 through the first connection line CT and the second connection line.

[0045] It should be noted that Figure 2Only the situation where the first connection line CT overlaps the first leading end 211a, the second leading end 212a, and the third leading end 213a is shown, without showing the second connection line which also overlaps the first trailing end, the second trailing end, and the third trailing end at the other end of the three-layer trace.

[0046] It can be understood that when the first trace 211, the second trace 212, and the third trace 213 are all broken, the measured impedance is very large, and the first detection line 21 is severely broken, indicating poor bending performance of the display panel 100. When two of the traces are broken, the measured impedance is relatively small, and the first detection line 21 is moderately broken, indicating medium bending performance of the display panel 100. When none of the three traces are broken, the measured impedance is the smallest, indicating good bending performance of the display panel 100. Therefore, the risk of crack occurrence in the display panel 100 can be evaluated by the impedance level, and corresponding countermeasures can be formulated accordingly.

[0047] Please refer to Figure 3 , Figure 3 which Figure 1 is a schematic cross-sectional structure diagram of the display panel at C-C1 in

[0048] The first trace 211, the second trace 212, and the third trace 213 are arranged in different layers and overlap in the thickness direction Z.

[0049] In some embodiments, the crack detection circuit 20 further includes a second detection line 22 which extends along the first direction X across the bending area 100a and the non-bending area 100b and is arranged parallel to and in series connection with the first detection line 21.

[0050] As Figure 1 shown, the second detection line 22 has a fourth leading end 22a and a fourth trailing end 22b. The distance from the fourth leading end 22a to the first leading end 211a (or leading end A) is less than the distance from the fourth trailing end 22b to the first leading end 211a (or leading end A), and the fourth leading end 22a is connected to the first connection line CT. That is to say, the fourth trailing end 22b of the second detection line 22 is closer to the trailing end B of the first detection line 21 relative to the fourth leading end 22a, and the fourth leading end 22a of the second detection line 22 is closer to the leading end A of the first detection line 21 relative to the fourth trailing end 22b. The fourth leading end 22a of the second detection line 22 is connected to the leading end A of the first detection line 21, thus realizing the series connection of the second detection line 22 and the first detection line 21.

[0051] In some embodiments, the second detection line 22 may be disposed on the same layer as the first connection line CT. That is to say, the second detection line 22 may be disposed on the same layer as the source-drain metal layer (i.e., the first metal layer) of the thin film transistor.

[0052] In some embodiments, since the first detection line 21 is disposed outside the second detection line 22, that is, the first detection line 21 is closer to the edge of the display panel 100, and cracks are more likely to occur at the edge position due to bending and cutting, the toughness of the material of the first detection line 21 may be less than the toughness of the material of the second detection line 22, thereby improving the detection sensitivity at the edge position.

[0053] As Figure 3 shown, the display panel 100 may include, from bottom to top, a barrier layer 101, a buffer layer 102, a first gate insulating layer 103, a second gate insulating layer 104, a first interlayer dielectric layer 105, a third gate insulating layer 106, and a second interlayer dielectric layer 107 disposed on a substrate 10. The first trace 211 is located between the third gate insulating layer 106 and the second interlayer dielectric layer 107, the second trace 212 is located between the second gate insulating layer 104 and the first interlayer dielectric layer 105, and the third trace 213 is located between the first gate insulating layer 103 and the second gate insulating layer 104.

[0054] The display panel 100 may further include, from bottom to top, a first metal layer M1, a first planarization layer PLN1, a second metal layer M2, a second planarization layer PLN2, a pixel definition layer PDL, and a support layer PS disposed on the second interlayer dielectric layer 107 in sequence.

[0055] The display panel 100 may include a barrier wall region D11 and an edge region D12. The barrier wall region D11 is located between the edge region D12 and the display region AA, that is, the edge region D12 is farther from the display region AA than the barrier wall region D11. The first detection line 21, the first metal layer M1, the second metal layer M2, the pixel definition layer PDL, and the support layer PS are located in the barrier wall region D11, and the first planarization layer PLN1 and the second planarization layer PLN2 are located in the barrier wall region D11 and the edge region D12.

[0056] In the edge region D12, vias are formed in the barrier layer 101, the buffer layer 102, the first gate insulating layer 103, the second gate insulating layer 104, the first interlayer dielectric layer 105, the third gate insulating layer 106, and the second interlayer dielectric layer 107, and the first planarization layer PLN1 fills the vias and covers the second interlayer dielectric layer 107.

[0057] In the retaining wall area D11, the first metal layer M1, the first planarization layer PLN1, the second metal layer M2, the second planarization layer PLN2, the pixel definition layer PDL, and the support layer PS can form a retaining wall structure DAM for preventing ink from overflowing.

[0058] The display panel 100 may further include a first encapsulation layer 1081, a second encapsulation layer 1082, a first dielectric layer 1091, and a second dielectric layer 1092 that are sequentially located on the support layer PS.

[0059] The substrate 10 may include one or a combination of a glass substrate and a flexible substrate. The materials of the first metal layer M1 and the second metal layer M2 may be Mo, or Mo / Al, or Mo / Cu, or Mo / Cu / IZO, or IZO / Cu / IZO, or Mo / Cu / ITO, or Ni / Cu / Ni, or MoTiNi / Cu / MoTiNi, or NiCr / Cu / NiCr, or CuNb, etc. The first planarization layer PLN1 and the second planarization layer PLN2 may be organic materials and may have the same material. The pixel definition layer PDL may be an organic material, and the support layer PS may be an organic material. The first encapsulation layer 1081 and the second encapsulation layer 1082 may be inorganic materials and may have different materials. The first dielectric layer 1091 and the second dielectric layer 1092 include, but are not limited to, inorganic materials such as SiOX, or SiNX, or Al2O3, etc.

[0060] In some embodiments, the second detection line 22 is disposed corresponding to the retaining wall structure DAM and is disposed on the same layer as the first metal layer M1, and the first detection line 21 is located below the second detection line 22.

[0061] As Figure 1 shown, the display panel 100 may include an AA, a first side area D1, and a second side area D2. The first side area D1 and the second side area D2 are located on opposite sides of the AA in the second direction Y, and the second direction Y is perpendicular to the first direction X.

[0062] The display panel 100 may further include a third side area D3 and a fourth side area D4. The third side area D3 and the fourth side area D4 are respectively located on opposite sides of the AA in the first direction X. Specifically, the first side area D1, the second side area D2, the third side area D3, and the fourth side area D4 are respectively located on the left, right, top, and bottom sides of the AA (in the illustrated direction).

[0063] The first detection line 21 is located in the first side region D1 and the second side region D2, and the second detection line 22 is located in the first side region D1 and the second side region D2. The first detection line 21 in the first side region D1 is connected in series with the second detection line 22 in the first side region D1. The first detection line 21 in the second side region D2 is connected in series with the second detection line 22 in the second side region D2. Therefore, a series detection line can be formed in the first side region D1 and the second side region D2 respectively.

[0064] Specifically, in the first side region D1, the fourth leading end 22a of the second detection line 22 is connected to the first connection line CT to achieve series connection with the first detection line 21. In the second side region D2, the fourth leading end 22a of the second detection line 22 is also connected to the first connection line CT to achieve series connection with the first detection line 21.

[0065] As Figure 1 shown, the first detection line 21 can extend from the first side region D1 to the third side region D3, and the second detection line 22 can also extend from the first side region D1 to the third side region D3, and the first detection line and the second detection line 22 can be connected within the third side region D3. Among them, the two series detection lines are separated from each other within the third side region D3.

[0066] Specifically, the leading end A of the first detection line 21 and the fourth leading end 22a of the second detection line 22 are both located in the third side region D3 to achieve connection within the third side region D3, and the trailing end B of the first detection line 21 and the fourth trailing end 22b of the second detection line 22 are both located in the fourth side region D4.

[0067] In some embodiments, the impedance can be tested at both ends of each of the series detection lines (including the first detection line 21 and the second detection line 22), and the impedances of the two series detection lines are tested respectively.

[0068] In other embodiments, the crack detection circuit 20 further includes a first detection terminal P1 and a second detection terminal P2. The first detection terminal P1 is connected to the first detection line 21 (trailing end B) in the first side region D1, and the second detection terminal P2 is connected to the first detection line 2 (trailing end) in the second side region D2. Among them, the fourth trailing end 22b of the second detection line 22 in the first side region D1 is electrically connected to the fourth trailing end 22b of the second detection line 22 in the second side region D2, so as to achieve series connection between the two series detection lines. Therefore, the breakage of the detection lines in the first side region D1 and the second side region D2 can be detected by testing the impedance between the first detection terminal P1 and the second detection terminal P2.

[0069] In some embodiments, the crack detection circuit 20 further includes a third detection line 23. The third detection line 23 has a fifth first end 23a and a fifth second end 23b, and the fifth first end 23a and the fifth second end 23b are located in the fourth side region D4. The fifth first end 23a is connected to the fourth second end 22b of the second detection line 22 in the first side region D1, and the fifth second end 23b is connected to the fourth second end 22b of the second detection line 22 in the second side region D2. That is to say, in this embodiment, the third detection line 23 is used to connect in series two series detection lines in the first side region D1 and the second side region D2.

[0070] In some embodiments, the AA includes an opening area OA. The distance from the opening area OA to the third side region D3 is less than the distance from the opening area OA to the fourth side region D4, that is to say, the opening area OA is closer to the third side region D3.

[0071] The third detection line 23 extends in the first side region D1, the third side region D3 and the second side region D2, and is arranged around the opening area OA. Therefore, the third detection line 23 not only connects the detection lines in the first side region D1 and the second side region D2 in series, but also can detect the crack condition of the opening area OA at the same time. Moreover, the third detection line 23, the second detection line 22 and the first detection line 21 are all located in the first side region D1 and the second side region D2, which can increase the detection area.

[0072] As Figure 1 shown, the third detection line 23 starts from the fifth first end 23a, goes along the middle position of the first side region D1 to the third side region D3, then goes down around the opening area OA, enters the third side region D3 after winding out, and finally goes along the second side region D2 to the fifth second end 23b.

[0073] In order to increase the area for detecting cracks in the opening area OA, the third detection line 23 can be arranged around the opening area OA in the form of multiple turns of winding. Figure 1 It shows that there are two turns of winding around the opening area OA.

[0074] In some embodiments, the third detection line 23, the second detection line 22 and the first detection line 21 are all arranged in different layers. For example, the third detection line 23 can be arranged in the same layer as the touch layer (not shown) in the display panel 100. In this way, detection lines in different layers can be arranged in the thickness direction Z of the display panel 100, and the detection range in the thickness direction Z can be increased.

[0075] In some embodiments, the crack detection circuit 20 may further include a fourth detection line 24 and a fifth detection line 25. The fourth detection line 24 is connected between the first detection line 21 (end B) in the first side region D1 and the first detection terminal P1, and the fifth detection line 25 is connected between the second detection line 22 (end) in the second side region D2 and the second detection terminal P2.

[0076] The fourth detection line 24 and the fifth detection line 25 are located in the fourth side region D4, and the fourth detection line 24 and the second detection line 22 may wind back and forth multiple times in the first direction X. The fourth side region D4 may be a bending and bonding region, so the fourth detection line 24 and the fifth detection line 25 can detect the crack conditions in the bending and bonding region.

[0077] In the embodiments of the present application, by testing the impedance between the first detection terminal P1 and the second detection terminal P2, the crack conditions in the first side region D1, the second side region D2, the third side region D3, the fourth side region D4, and the opening region OA can be detected. Among them, the cracks in the first side region D1 and the second side region D2 are mainly caused by bending and cutting.

[0078] In some embodiments, the fourth detection line 24 and the fifth detection line 25 may be disposed on the same layer, and may be disposed on the same layer as the second metal layer M2.

[0079] Please refer to Figure 4 , Figure 4 which Figure 1 is a top view structural schematic diagram of the first detection line in the first side region in

[0080] The first detection line 21 includes a first line segment group 21a and a second line segment group 21b. The first line segment group 21a is located in the bending region 100a, and the second line segment group 21b is located in the non-bending region 100b and is connected to the first line segment group 21a. Among them, the first line segment group 21a has three layers of traces (the first trace 211, the second trace 212, and the third trace 213), and the second line segment group 21b also has these three layers of traces.

[0081] The first line segment group 21a includes multiple straight line segments 210 extending along the first direction X and spaced apart along the second direction Y. Adjacent two of the straight line segments 210 are connected in series at the head and tail, and the second direction Y is perpendicular to the first direction X. That is to say, the first line segment group 21a winds back and forth in the first direction X to form multiple turns to increase the wiring area. In this way, the first line segment group 21a is closer to the edge of the display panel 100, and it is easier to detect the cracks generated by the cutting of the scribe lane.

[0082] In some embodiments, the dimension of the first line segment group 21a in the second direction Y is greater than the dimension of the second line segment group 21b in the second direction Y. For example, the first line segment is just a single one without winding. In the embodiments of the present application, multiple turns of winding are provided in the bending region 100a, while no winding is provided in the non-bending region 100b, which can increase the inspection sensitivity of cracks caused by bending stress.

[0083] The embodiments of the present application further provide a display device, including the display panel in any of the above embodiments.

[0084] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of the display device provided by some embodiments of the present application.

[0085] The display device 200 includes a device main body and a display panel 201, and the display panel 201 can be the display panel in any of the above embodiments. In addition, the device main body can include a frame body, a driving component, a power supply, etc. The display device can be a display terminal such as a mobile phone, a tablet computer, a television, etc., which is not limited herein.

[0086] The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; 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 in that, The display panel includes a bending region and non-bending regions located on opposite sides of the bending region in a first direction, and the display panel includes: a substrate; a crack detection circuit located on the substrate, the crack detection circuit including a first detection line that spans the bending region and the non-bending regions in the first direction; wherein, the first detection line at least includes a first trace and a second trace connected in parallel, and the first trace and the second trace are spaced apart in the thickness direction of the display panel.

2. The display panel according to claim 1, wherein The first trace has a first leading end and a first trailing end, the second trace has a second leading end and a second trailing end, and the second leading end and the first leading end are located at the same end of the first detection line; The crack detection circuit further includes: a first connection line and a second connection line located on a side of the first trace and the second trace away from the substrate; wherein, the first connection line connects the first leading end and the second leading end, and the second connection line connects the first trailing end and the second trailing end.

3. The display panel according to claim 2, wherein The first detection line further includes: a third trace connected in parallel with the first trace and the second trace; wherein, the third trace has a third leading end and a third trailing end, and the third leading end and the first leading end are located at the same end of the first detection line; The first connection line connects the third leading end, the second leading end, and the first leading end, and the second connection line connects the third trailing end, the second trailing end, and the third trailing end.

4. The display panel according to claim 3, wherein The first trace, the second trace, and the third trace are all arranged in different layers, and the first trace, the second trace, and the third trace overlap in the thickness direction.

5. The display panel according to claim 1, characterized in that, The first detection line includes: a first line segment group located in the bending region, the first line segment group including a plurality of straight line segments extending in the first direction and spaced apart in a second direction, and adjacent two of the straight line segments are connected in series end to end, and the second direction is perpendicular to the first direction; a second line segment group located in the non-bending region and connected to the first line segment group.

6. The display panel according to claim 5, wherein The dimension of the first line segment group in the second direction is greater than the dimension of the second line segment group in the second direction.

7. The display panel according to claim 2, characterized in that, The crack detection circuit further includes: a second detection line that spans the bending region and the non-bending regions in the first direction, and is arranged parallel to and connected in series with the first detection line; wherein, the second detection line has a fourth leading end and a fourth trailing end, the distance from the fourth leading end to the first leading end is less than the distance from the fourth trailing end to the first leading end, and the fourth leading end is connected to the first connection line.

8. The display panel according to claim 7, wherein The display panel includes a display region, a first side region, and a second side region, the first side region and the second side region are located on opposite sides of the display region in a second direction, and the second direction is perpendicular to the first direction; The first detection line is located in the first side region and the second side region, and the second detection line is located in the first side region and the second side region; The first detection line in the first side region is connected in series with the second detection line in the first side region; the first detection line in the second side region is connected in series with the second detection line in the second side region.

9. The display panel according to claim 8, characterized in that, The crack detection circuit further includes: A first detection terminal connected to the first detection line in the first side region; A second detection terminal connected to the first detection line in the second side region; Wherein, the fourth end of the second detection line in the first side region is electrically connected to the fourth end of the second detection line in the second side region.

10. The display panel according to claim 9, wherein, The crack detection circuit further includes: A third detection line having a fifth first end and a fifth end, the fifth first end being connected to the fourth end of the second detection line in the first side region, and the fifth end being connected to the fourth end of the second detection line in the second side region.

11. The display panel according to claim 10, wherein, The third detection line, the second detection line, and the first detection line are all disposed in different layers.

12. The display panel according to claim 10, wherein The display panel further includes a third side region and a fourth side region, the third side region and the fourth side region are respectively located on opposite sides of the display region in the first direction, and the fifth first end and the fifth end are located on the fourth side; The display region includes an opening region, and the distance from the opening region to the third side region is less than the distance from the opening region to the fourth side region; The third detection line extends in the first side region, the third side region, and the second side region, and is disposed around the opening region.

13. A display device, characterized in that, Including the display panel according to any one of claims 1 to 12.

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