Display panel, preparation method of display panel and display device

Abstract

The invention discloses a display panel, a preparation method of the display panel and a display device, and relates to the technical field of display, the display panel comprises a substrate, a display unit, a barrier dam body, a packaging layer and a crack detection signal line, the substrate is divided into a display area and a packaging area, the display unit is arranged in the display area, the barrier dam body is arranged in the packaging layer, and the crack detection signal line is arranged in the packaging layer. The packaging layer covers the display unit and the packaging area, the barrier dam body is arranged between the packaging layer and the substrate, the crack detection signal line is arranged on the side, away from the barrier dam body, of the packaging layer and surrounds the packaging area, a connecting through hole is formed in the packaging layer and corresponds to the barrier dam body, and the crack detection signal line is arranged in the packaging layer and corresponds to the barrier dam body. The crack detection signal line passes through the connecting through hole, and the barrier dam body is conducted with a connecting line connected with the signal end of the crack detection sensor; through the above design, the problem of broken connection of the crack detection signal line is avoided, so that the crack detection precision is improved.

Description

Technical Field

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

[0002] At present, the Thin Film Encapsulation (TFE) flexible encapsulation route of the Fine Metal Mask (FMM) route is very mature; however, in order to achieve higher pixels and performance effects, the industry is currently developing a mask-free OLED process route for mass production of barrier dams. When we also use the FMM approach to design the TFE encapsulation dam blocking structure, we need to ensure the reliability of the encapsulation, so we need to design a detection line to monitor whether the encapsulation has cracks.

[0003] Because there is a barrier dam body around the display panel, which is used to block the leveling of the organic encapsulation layer; the first inorganic encapsulation layer and the second inorganic encapsulation layer cover the barrier dam body, and an undercut structure or a semi-air undercut structure is formed at the barrier dam body. As a result, the subsequent crack detection signal line will be broken when crossing the barrier dam body, affecting the crack detection accuracy.

[0004] Therefore, this is an issue that needs to be addressed urgently. Summary of the invention

[0005] The purpose of the present application is to provide a display panel, a method for preparing a display panel, and a display device that improve the accuracy of crack detection.

[0006] The present application discloses a display panel, including a substrate, a display unit, a blocking dam, an encapsulation layer and a crack detection signal line, wherein the substrate is divided into a display area and an encapsulation area, the display unit is arranged in the display area, the encapsulation layer covers the display unit and the encapsulation area, the blocking dam is arranged between the encapsulation layer and the substrate, the crack detection signal line is arranged on a side of the encapsulation layer away from the blocking dam, and is arranged around the encapsulation area, wherein

[0007] A connecting through hole is provided on the packaging layer corresponding to the barrier dam body, and the crack detection signal line is conducted through the connecting through hole and the connecting line connecting the barrier dam body and the signal end of the crack detection sensor.

[0008] Optionally, the barrier dam is made of conductive material.

[0009] Optionally, the packaging area includes a perforated area, the display panel also includes a first blocking dam, the blocking dam body includes a first blocking dam body and a second blocking dam body, the connecting through hole includes a first through hole and a second through hole, the first through hole is arranged corresponding to the first blocking dam body, and the second through hole is arranged corresponding to the second blocking dam body; the crack detection signal line includes a first crack detection signal line, the signal end includes a first input end and a first output end, the first blocking dam is arranged around the perforated area at least once, the first blocking dam body and the second blocking dam body are arranged at intervals along the direction of the first blocking dam surrounding, and are located on the side of the first blocking dam away from the perforated area, one end of the first crack detection signal line is connected through the first through hole, the first blocking dam body and the connecting line of the first input end, and the other end of the first crack detection signal line is connected through the second through hole, the second blocking dam body and the connecting line of the first output end.

[0010] Optionally, the encapsulation area includes a perforated area, the display panel further includes a first blocking dam and a second blocking dam, the blocking dam body includes a first blocking dam body and a second blocking dam body, the connecting through hole includes a first through hole and a second through hole, the first through hole is arranged corresponding to the first blocking dam body, and the second through hole is arranged corresponding to the second blocking dam body; the crack detection signal line includes a first crack detection signal line, the signal end includes a first input end and a first output end, the first blocking dam is arranged around the perforated area at least once, the second blocking dam includes a first end and a second end, and the second blocking dam surrounds the first blocking A dam is set, and a gap is formed between the first end and the second end, the first barrier dam body and the second barrier dam body are spaced apart at the gap along the direction from the first end to the second end, the first crack detection signal line is set along the surrounding direction of the second barrier dam body, and is set on the side of the second barrier dam body away from the substrate, one end of the first crack detection signal line is connected through the first through hole, the first barrier dam body and the connecting line of the first input end, and the other end of the first crack detection signal line is connected through the second through hole, the second barrier dam body and the connecting line of the first output end.

[0011] Optionally, the encapsulation area includes a perforated area, the display panel further includes a first blocking dam, the blocking dam body includes a first blocking dam body, a second blocking dam body and a plurality of third blocking dam bodies, the connecting through hole includes a first through hole and a second through hole, the first through hole is arranged corresponding to the first blocking dam body, and the second through hole is arranged corresponding to the second blocking dam body; the crack detection signal line includes a first crack detection signal line, the signal end includes a first input end and a first output end, the first blocking dam is arranged around the perforated area at least once, the first blocking dam body, the second blocking dam body, The dam body and a plurality of the third barrier dam bodies are arranged around the first blocking dam, and the first barrier dam body is spaced apart from the second barrier dam body, the first crack detection signal line is arranged along the surrounding direction of the plurality of the third barrier dam bodies, and is arranged on a side of the plurality of the third barrier dam bodies away from the substrate, one end of the first crack detection signal line is connected through the first through hole, the first barrier dam body and the connecting line of the first input end, and the other end of the first crack detection signal line is connected through the second through hole, the second barrier dam body and the connecting line of the first output end.

[0012] Optionally, the encapsulation area also includes an edge area, the blocking dam body also includes a fourth blocking dam body and a fifth blocking dam body, the display panel also includes a third blocking dam, the third blocking dam is arranged on a side of the edge area away from the display area, and is connected and arranged around the display area in a circle; the fourth blocking dam body and the fifth blocking dam body are arranged between the display area and the third blocking dam, and are arranged at intervals along the direction around the third blocking dam; the connecting through hole includes a third through hole and a fourth through hole, the third through hole is arranged corresponding to the fourth blocking dam body, and the fourth through hole is arranged corresponding to the fifth blocking dam body; the crack detection signal line also includes a second crack detection signal line, the second crack detection signal line is arranged around the display area and the third blocking dam, the signal end also includes a second input end and a second output end, one end of the second crack detection signal line is connected through the third through hole, the fourth blocking dam body and the connecting line of the second input end, and the other end of the second crack detection signal line is connected through the fourth through hole, the fifth blocking dam body and the connecting line of the second output end.

[0013] Optionally, the display panel also includes a third crack detection signal line, the blocking dam also includes a sixth blocking dam and a seventh blocking dam, the sixth blocking dam and the seventh blocking dam are spaced apart in a direction surrounding the perforated area on a side of the first blocking dam and the second blocking dam away from the perforated area, and the sixth blocking dam and the seventh blocking dam are staggered with the first blocking dam and the second blocking dam; the connecting through hole also includes a fifth through hole and a sixth through hole, the fifth through hole is arranged corresponding to the sixth blocking dam, and the sixth through hole is arranged corresponding to the seventh blocking dam; the signal end also includes a third input end and a third output end; the third crack detection signal line is arranged around the first crack detection signal line, one end of the third crack detection signal line is connected to the connecting line of the third input end through the fifth through hole and the sixth blocking dam, and the other end of the third crack detection signal line is connected to the connecting line of the third output end through the sixth through hole and the seventh blocking dam.

[0014] Optionally, the display panel also includes a first barrier seat and a second barrier seat, the first barrier seat is arranged in the perforated area and is located between the first barrier dam, the second barrier dam and the substrate, and the second barrier seat is arranged in the edge area and is located between the fourth barrier dam and the fifth barrier dam; the encapsulation layer includes a first inorganic encapsulation layer and a second inorganic encapsulation layer, the first through hole, the second through hole, the third through hole and the fourth through hole all penetrate the first inorganic encapsulation layer and the second inorganic encapsulation layer in a direction perpendicular to the substrate, the first barrier seat includes a stacked alignment layer, a panel protection layer, a first passivation layer, a first connecting metal layer and a first pixel definition layer, the connecting line of the first input end and the connecting line of the first output end are both electrically connected to the first connecting metal layer; the second barrier seat includes a stacked second passivation layer, a second connecting metal layer, a second connecting line and a second pixel definition layer, The connection line of the second input end and the connection line of the second output end are both electrically connected to the second connection metal layer; the first pixel definition layer corresponds to the first blocking dam, and penetrates the first pixel definition layer in a direction perpendicular to the substrate to form a first connection hole, and a part of the conductive layer of the first blocking dam is located in the first connection hole, and cooperates with the first connection hole to form a first connection area; the first pixel definition layer corresponds to the second blocking dam, and penetrates the first pixel definition layer in a direction perpendicular to the substrate to form a second connection hole, and the conductive layer of the second blocking dam is located in the second connection hole, and cooperates with the first connection hole to form a second connection area, one end of the first crack detection signal line is connected to the first connection metal layer through the first through hole, the first blocking dam and the first connection area, and the other end of the first crack detection signal line is connected to the first connection metal layer through the second through hole, the second blocking dam and the second connection area;

[0015] The second pixel definition layer corresponds to the fourth barrier dam, and a third connection hole is formed by penetrating the second pixel definition layer in a direction perpendicular to the substrate. Part of the conductive layer of the fourth barrier dam is located in the third connection hole, and cooperates with the third connection hole to form a third connection area; the second pixel definition layer corresponds to the fifth barrier dam, and a fourth connection hole is formed by penetrating the second pixel definition layer in a direction perpendicular to the substrate. Part of the conductive layer of the fifth barrier dam is located in the third connection hole, and cooperates with the third connection hole to form a fourth connection area; one end of the second crack detection signal line is connected to the second connection metal layer through the third through hole, the fourth barrier dam and the third connection area, and the other end of the second crack detection signal line is connected to the second connection metal layer through the fourth through hole, the fifth barrier dam and the fourth connection area; wherein the first passivation layer and the second passivation layer are arranged on the same layer, the first connection metal layer and the second connection metal layer are arranged on the same layer, and the first pixel definition layer and the second pixel definition layer are arranged on the same layer.

[0016] The present application also discloses a method for preparing a display panel, which is used to prepare the display panel as described above, comprising the steps of:

[0017] providing a substrate;

[0018] Dividing the substrate into a display area and a packaging area;

[0019] forming a display unit on the substrate corresponding to the display area;

[0020] forming a barrier dam on the substrate corresponding to the packaging area;

[0021] forming an encapsulation layer above the display unit and the barrier dam to cover the display unit and the barrier dam;

[0022] Forming a connecting through hole on the packaging layer corresponding to the barrier dam body by using a process;

[0023] A crack detection signal line is arranged above the packaging layer, so that the crack detection signal line is connected through the connection through hole, the barrier dam and the connection line connecting the signal end of the crack detection sensor.

[0024] Compared with the prior art, in which an undercut structure or a semi-empty undercut structure is formed at the barrier dam body, which causes the subsequent crack detection signal line to be broken when crossing the barrier dam body, thereby affecting the detection effect, the encapsulation layer of the display panel of the present application covers the display unit and the encapsulation area, the barrier dam body is arranged between the encapsulation layer and the substrate, the crack detection signal line is arranged on the side of the encapsulation layer away from the barrier dam body, and is arranged around the encapsulation area, wherein a connecting through hole is provided on the encapsulation layer corresponding to the barrier dam body, and the crack detection signal line passes through the connecting through hole , the connecting line connecting the barrier dam body and the signal end of the crack detection sensor is conductive, so that the barrier dam body can be used as a bridge part of the crack detection signal line, and the crack detection signal line is connected to the barrier dam body and the metal wiring layer inside through the connecting through hole, and then connected to the signal end of the crack detection sensor for accessing and outputting signals, thereby avoiding the problem of disconnection of the subsequent crack detection signal line when crossing the barrier dam body due to the formation of an undercut structure or a semi-air package undercut structure at the barrier dam body, thereby improving the accuracy of crack detection and ensuring the reliability of the overall package. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0026] Figure 1 It is a structural schematic diagram of forming a first inorganic encapsulation layer above the barrier dam in the reference technology;

[0027] Figure 2 yes Figure 1 A schematic diagram of the local enlarged structure of the middle A area;

[0028] Figure 3 It is a schematic diagram of the block diagram structure of the display device provided by the present application;

[0029] Figure 4 is a schematic diagram of the structure of the display panel provided by the present application;

[0030] Figure 5 yes Figure 4 A schematic diagram of the local enlarged structure of the middle A area;

[0031] Figure 6 The first embodiment of this application provides Figure 4A schematic diagram of the local enlarged structure of the middle B area;

[0032] Figure 7 yes Figure 6 A schematic diagram of the cross-sectional structure along the cross-sectional line E-E';

[0033] Figure 8 yes Figure 5 A schematic diagram of the cross-sectional structure along the cross-sectional line F-F';

[0034] Fig. 9 It is a schematic diagram of the structure of arranging two crack detection signal lines provided in the first embodiment of the present application;

[0035] Fig.10 yes Fig. 9 A schematic diagram of the cross-sectional structure along the cross-sectional line G-G';

[0036] Fig.11 yes Fig. 9 A schematic diagram of the cross-sectional structure along the cross-sectional line H-H';

[0037] Fig.12 yes Fig. 9 A schematic diagram of the cross-sectional structure along the cross-sectional line II';

[0038] Fig.13 is a schematic diagram of the top view structure of the display area and edge area of ​​the display panel provided in the first embodiment of the present application;

[0039] Fig.14 yes Fig.13 A schematic diagram of the cross-sectional structure along the cross-sectional line J-J' or K-K';

[0040] Fig.15 is a schematic diagram of the process steps of the method for preparing a display panel provided in the first embodiment of the present application;

[0041] Fig.16 yes Fig.15 A schematic flow chart of further steps of step S4;

[0042] Fig.17 yes Fig.15 A schematic flow chart of further steps of step S6;

[0043] Fig.18 is a schematic diagram of the top view of the punching area provided in the second embodiment of the present application;

[0044] Fig.19 It is a schematic diagram of the top view structure of the punching area provided in the second embodiment of the present application.

[0045] Among them, 10, display device; 100, display panel; 110, substrate; 111, display area; 112, packaging area; 113, punching area; 114, edge area; 115, display unit; 120, crack detection signal line; 121, first crack detection signal line; 122, second crack detection signal line; 123, third crack detection signal line; 130, barrier dam; 131, conductive layer; 132, shielding layer; 133, first barrier dam; 134, second barrier dam; 135, fourth barrier dam; 136, fifth barrier dam; 137, sixth barrier dam; 138, seventh barrier dam; 140, encapsulation layer; 141, connecting through hole; 142, first through hole; 143, second through hole; 144, third through hole; 145, fourth through hole; 146, fifth through hole; 147, sixth through hole; 148, first inorganic encapsulation layer; 149, second inorganic encapsulation layer; 150, first barrier dam; 160, second barrier dam; 161 , first end; 162, second end; 163, notch; 170, third blocking dam; 180, first blocking seat; 181, alignment layer; 182, panel protection layer; 183, first passivation layer; 184, first connection metal layer; 185, first pixel definition layer; 186, first connection hole; 187, second connection hole; 188, first connection area; 189, second connection area; 200, second blocking seat; 210, second passivation layer; 220, second connection metal layer ; 230, second pixel definition layer; 231, third connection hole; 232, fourth connection hole; 233, third connection area; 234, fourth connection area; 300, organic encapsulation layer; 400, connection line connected to the signal end of the crack sensor; 410, connection line of the first input end; 420, connection line of the first output end; 430, connection line of the second input end; 440, connection line of the second output end; 450, connection line of the third input end; 460, connection line of the third output end. DETAILED DESCRIPTION

[0046] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative, but the present application can be implemented in many alternative forms and should not be construed as being limited to only the embodiments described herein.

[0047] In the description of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, unless otherwise specified, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; "multiple" means two or more. In addition, the terms "upper", "lower", "left", "right", "second direction", "first direction", etc. indicating the orientation or position relationship are described based on the orientation or relative position relationship shown in the accompanying drawings, and are only for the convenience of describing the simplified description of the present application, rather than indicating that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0048] Figure 3 is a schematic diagram of the block diagram of the display device provided by the present application, Figure 4 is a schematic diagram of the structure of the display panel provided by the present application, Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure of area A in the middle, combined with Figure 3-Figure 5 The present application discloses a display device 10, including a display panel 100, wherein the display panel 100 includes a substrate 110, a display unit 115, a blocking dam 130, an encapsulation layer 140 and a crack detection signal line 120, wherein the substrate 110 is divided into a display area 111 and an encapsulation area 112, wherein the display unit 115 is arranged in the display area 111, and the encapsulation layer 140 covers the display unit 115 and the encapsulation area 112, wherein the blocking dam 130 is arranged between the encapsulation layer 140 and the substrate 110, and the crack detection signal line 120 is arranged on a side of the encapsulation layer 140 away from the blocking dam 130, and is arranged around the encapsulation area 112, wherein a connecting through hole 141 is provided on the encapsulation layer 140 corresponding to the blocking dam 130, and the crack detection signal line 120 is conducted through the connecting through hole 141, the blocking dam 130 and a connecting line 400 connecting a signal end of a crack detection sensor.

[0049] like Figure 1-Figure 2As shown, referring to the current display panel 100, the barrier dam 130 is similar to a mushroom body structure, the conductive layer 131 is similar to the mushroom stem of the mushroom body, and the shielding layer 132 is similar to the mushroom cap located above the mushroom stem. The structural features between the conductive layer 131 and the shielding layer 132 easily lead to the formation of an undercut structure or a semi-air package undercut structure in the area between the conductive layer 131 and the two sides of the shielding layer 132 when the first inorganic encapsulation layer 148 and the second inorganic encapsulation layer 149 are encapsulated after the light-emitting layer and the cathode are evaporated. The inventor of the present application found that such a design needs to cross the barrier dam 130 when laying out the crack detection signal line 120, which will easily cause disconnection and affect the detection effect. Therefore, in order to avoid the disconnection problem of the crack detection signal line 120, the present application specifically, the encapsulation layer 140 of the display panel 100 of the present application covers the display unit 115 and the encapsulation area 112, the barrier dam 130 is arranged between the encapsulation layer 140 and the substrate 110, and the crack The crack detection signal line 120 is arranged on a side of the packaging layer 140 away from the blocking dam body 130 and is arranged around the packaging area 112, wherein a connecting through hole 141 is provided on the packaging layer 140 corresponding to the blocking dam body 130, and the crack detection signal line 120 is connected through the connecting through hole 141, the blocking dam body 130 and the connecting line 400 connected to the signal end of the crack detection sensor, so that the blocking dam body 130 can be used as a bridge portion of the crack detection signal line 120, and the crack detection signal The line 120 is connected to the barrier dam body 130 and the metal wiring layer inside through the connecting through hole 141, and then connected to the signal end of the crack detection signal line 120 crack detection sensor for receiving and outputting signals, thereby avoiding the problem of disconnection of the subsequent crack detection signal line 120 when crossing the barrier dam body 130 due to the formation of an undercut structure or a semi-air package undercut structure at the barrier dam body 130, thereby improving the accuracy of crack detection and ensuring the reliability of the overall package.

[0050] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0051] First embodiment:

[0052] Figure 6 The first embodiment of this application provides Figure 4 A schematic diagram of the local enlarged structure of the B area in the middle. Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure along the section line E-E', Figure 8 yes Figure 5 Schematic diagram of the cross-sectional structure along the section line F-F', combined with Figure 6-Figure 8The blocking dam 130 is made of a conductive material, and includes a conductive layer 131 and a shielding layer 132 stacked in sequence. The encapsulation area 112 includes a perforated area 113, and the display panel 100 also includes a first blocking dam 150. The blocking dam 130 includes a first blocking dam 133 and a second blocking dam 134. The connecting through hole 141 includes a first through hole 142 and a second through hole 143. The first through hole 142 is arranged corresponding to the first blocking dam 133, and the second through hole 143 is arranged corresponding to the second blocking dam 134. The crack detection signal line 120 includes a first crack detection signal line 121, and the signal end includes a first input end and a first output end. The first blocking dam 150 includes a first through hole 142 and a second through hole 143. 0 is arranged at least one circle around the punching area 113, the first blocking dam body 133 and the second blocking dam body 134 are arranged at intervals on the side of the first blocking dam 150 away from the punching area 113 along the direction of the first blocking dam 150 surrounding, one end of the first crack detection signal line 121 is connected to the connecting line 410 of the first input end through the first through hole 142 and the first blocking dam body 133, and the other end of the first crack detection signal line 121 is connected to the connecting line 420 of the first output end through the second through hole 143 and the second blocking dam body 134.

[0053] Specifically, the encapsulation layer 140 includes a first inorganic encapsulation layer 148 and a second inorganic encapsulation layer 149 stacked in sequence, and the first through hole 142 and the second through hole 143 both penetrate the first inorganic encapsulation layer 148 and the second inorganic encapsulation layer 149 in a direction perpendicular to the substrate 110 .

[0054] The display panel 100 further includes a first barrier seat 180, which is disposed in the perforated area 113 and is located between the first barrier dam 133, the second barrier dam 134 and the substrate 110. The first barrier seat 180 includes a stacked alignment layer 181, a panel protection layer 182, a first passivation layer 183, a first connection metal layer 184 and a first pixel definition layer 185. The connection line 410 of the first input end and the connection line 420 of the first output end are both electrically connected to the first connection metal layer 184. The first pixel definition layer 185 corresponds to the first barrier dam 133 and penetrates the first pixel definition layer 185 in a direction perpendicular to the substrate 110 to form a first connection hole 186. A portion of the conductive layer 131 of the first barrier dam 133 is located in the first connection hole 186 and cooperates with the first connection hole 186 to form a first connection area 188. The first pixel definition layer 185 A second connecting hole 187 is provided corresponding to the second barrier dam body 134, and the conductive layer 131 of the second barrier dam body 134 is located in the second connecting hole 187, and cooperates with the first connecting hole 186 to form a second connecting area 189, so that one end of the first crack detection signal line 121 is connected to the first connecting metal layer 184 through the first through hole 142, the first barrier dam body 133 and the first connecting area 188, and the other end of the first crack detection signal line 121 is connected to the first connecting metal layer 184 through the second through hole 143, the second barrier dam body 134 and the second connecting area 189, so that the input end of the connecting line of the crack sensor in the punching area 113 can input a signal. If a crack appears at the position of the punching area 113, then there is no signal output at the output end of the connecting line of the crack sensor in the punching area 113, which indicates that the crack detection signal line 120 arranged there is short-circuited, so that it can be judged whether a crack appears.

[0055] Since the first barrier dam 133 and the second barrier dam 134 are arranged at intervals around the perforated area 113, if cracks appear in the encapsulation layer 140 at the first barrier dam 133 and the second barrier dam 134, it may not be detected. Therefore, a circle of third crack detection signal lines 123 may be arranged outside the first crack detection signal line 121. Fig. 9 is a schematic diagram of the structure of laying out two crack detection signal lines 120 provided in the first embodiment of the present application, Fig.10 yes Fig. 9 Schematic diagram of the cross-sectional structure along the section line G-G', Fig.11 yes Fig. 9 Schematic diagram of the cross-sectional structure along the section line H-H', Fig.12 yes Fig. 9 Schematic diagram of the cross-sectional structure along the section line I-I', combined with Figure 9-11 , so that the blocking dam 130 also includes a sixth blocking dam 137 and a seventh blocking dam 138, the sixth blocking dam 137 and the seventh blocking dam 138 are arranged at intervals along the direction surrounding the punching area 113 on the side of the first blocking dam 133 and the second blocking dam 134 away from the punching area 113, and the sixth blocking dam 137 and the seventh blocking dam 138 are staggered with the first blocking dam 133 and the second blocking dam; the connecting through hole 141 also includes a fifth through hole 146 and a sixth through hole 147, the fifth through hole 146 and the seventh through hole 147 are arranged at the same time. The sixth barrier dam body 137 is arranged correspondingly, and the sixth through hole 147 and the seventh barrier dam body 138 are arranged correspondingly, so that one end of the third crack detection signal line 123 is connected to the connecting line 450 of the third input end through the fifth through hole 146 and the sixth barrier dam body 137, and the other end of the third crack detection signal line 123 is connected to the connecting line 460 of the third output end through the sixth through hole 147 and the seventh barrier dam body 138, forming a continuous detection circuit between the first barrier dam body 133 and the second barrier dam body 134, thereby enhancing the accuracy of crack detection.

[0056] Among them, 1 st PI is the first layer of flexible substrate, 2 nd PI is the second layer of flexible substrate, the first layer of flexible substrate and the second layer of flexible substrate can both be made of polyimide materials, Buffer ILD is an inorganic insulating layer, BPL is an insulating layer, which can be organic or inorganic, PLN is an organic insulating layer, PDL pixel definition layer, Body is a conductive layer structure of a barrier dam, Roof is a shielding layer structure of a barrier dam, these film layers are all conventional film layer structures of display panels, and the functions of each film layer will not be elaborated here. In the display area, the pixel unit located in the display unit (not shown in the figure) is wrapped by the barrier dam formed by the Body and the Roof to separate the two adjacent pixel units.

[0057] Fig.13 is a schematic diagram of a top view of the display area and edge area of ​​the display panel provided in the first embodiment of the present application, Fig.14 yes Fig.13 Schematic diagram of the cross-sectional structure along the section line J-J' or K-K', combined with Figure 13-Figure 14 , the encapsulation area 112 further includes an edge area 114, the barrier dam 130 further includes a fourth barrier dam 135 and a fifth barrier dam 136, the display panel 100 further includes a third barrier dam 170, the third barrier dam 170 is arranged on a side of the edge area 114 away from the display area 111, and is connected and arranged around the display area 111 in a circle, and is used to prevent the overflow of the organic encapsulation material in the display area 111 during inkjet printing;

[0058] The fourth barrier dam 135 and the fifth barrier dam 136 are arranged between the display area 111 and the third barrier dam 170, and are arranged at intervals along the direction surrounding the third barrier dam 170; the connecting through hole 141 includes a third through hole 144 and a fourth through hole 145, the third through hole 144 is arranged corresponding to the fourth barrier dam 135, and the fourth through hole 145 is arranged corresponding to the fifth barrier dam 136; the crack detection signal line 120 also includes a second crack detection signal line 122, The second crack detection signal line 122 is arranged in a surrounding manner between the display area 111 and the third blocking dam 170, and the signal end also includes a second input end and a second output end. One end of the second crack detection signal line 122 is connected to the connecting line 430 of the second input end through the third through hole 144 and the fourth blocking dam body 135, and the other end of the second crack detection signal line 122 is connected to the connecting line 440 of the second output end through the fourth through hole 145 and the fifth blocking dam body 136.

[0059] If cracks appear in the encapsulation layer 140 at the edge of the non-display area 111, external water and oxygen can easily enter through the encapsulation layer 140 and affect the display components of the display area 111. Therefore, a crack detection signal line 120 is set at the edge of the non-display area 111 to detect cracks at the edge of the non-display area 111, so that cracks can be detected in time to ensure edge encapsulation.

[0060] The display panel 100 further includes a second barrier seat 200, which includes a second passivation layer 210, a second connection metal layer 220 and a second pixel definition layer 230 which are stacked. The connection line 430 of the second input terminal and the connection line 440 of the second output terminal are both electrically connected to the second connection metal layer 220. The second pixel definition layer 230 corresponds to the fourth barrier dam 135, and a third connection hole 231 is formed by penetrating the second pixel definition layer 230 in a direction perpendicular to the substrate 110. A portion of the conductive layer 131 of the fourth barrier dam 135 is located in the third connection hole 231, and cooperates with the third connection hole 231 to form a third connection area 233. The second pixel definition layer 230 corresponds to the fifth barrier dam 136, and a third connection hole 231 is formed by penetrating the second pixel definition layer 230 in a direction perpendicular to the substrate 110. 230 forms a fourth connection hole 232, and part of the conductive layer 131 of the fifth barrier dam 136 is located in the third connection hole 231, and cooperates with the third connection hole 231 to form a fourth connection area 234; one end of the second crack detection signal line 122 is connected to the second connection metal layer 220 through the third through hole 144, the fourth barrier dam 135 and the third connection area 233, and the other end of the second crack detection signal line 122 is connected to the second connection metal layer 220 through the fourth through hole 145, the fifth barrier dam 136 and the fourth connection area 234, wherein the first passivation layer 183 and the second passivation layer 210 are arranged on the same layer, the first connection metal layer 184 and the second connection metal layer 220 are arranged on the same layer, and the first pixel definition layer 185 and the second pixel definition layer 230 are arranged on the same layer.

[0061] Similarly, in order to ensure that any cracks in the area between the fifth barrier dam 136 and the sixth barrier dam 137 in the edge area 114 can be detected, a fourth crack detection signal line 120 (not shown) can be added to surround the second crack detection signal line 122, and the two barrier dams 130 used to connect the fourth crack detection signal line 120 can be staggered with the fifth barrier dam 136 and the sixth barrier dam 137, which will not be repeated here.

[0062] like Figure 7-Figure 8As shown, in the perforated area 113, the width of the surface where the conductive layer 131 of the first barrier dam 133 or the second barrier dam 134 abuts against the shielding layer 132 is smaller than the width of the shielding layer 132. Assuming the width of the shielding layer 132 is H1, and the diameter of the first connecting hole 186 is h1, wherein 1 / 3H1≦h1<1 / 2H1, can ensure that the touch signal line is connected through the first connecting hole 186, and can ensure that the opening of the first connecting hole 186 on the packaging layer 140 is not too large, and there is enough packaging layer 140 to cover the shielding layer 132, and after the touch signal line is overlapped and matched, a sealed state is formed to avoid the invasion of water and oxygen.

[0063] Assume that the width of the surface where the conductive layer 131 abuts against the pixel definition layer is H12, and the diameter of the second connection hole 187 is h2, wherein 1 / 4H2≦h2<1 / 3H2, thereby reducing the exposed area of ​​the metal wiring layer and ensuring the abutment area of ​​the conductive layer 131 against the upper surface of the pixel definition layer, thereby ensuring the overall stability of the blocking structure on the pixel definition layer.

[0064] The first connection hole 186 and the second connection hole 187 can both be round holes, so that it can be more direct and convenient when performing the hole digging process. Of course, the first connection hole 186 and the second connection hole 187 can also be rectangular holes or polygonal holes, which are specifically designed according to actual needs and are not limited here. Similarly, the size of the contact area between the conductive layer 131 and the shielding layer 132 of the sixth barrier dam 137 or the seventh barrier dam 138, and the size of the corresponding connection hole are also designed as above, and in the edge area 114, the size of the contact area between the conductive layer 131 and the shielding layer 132 of the fourth barrier dam 135 or the fifth barrier dam 136, and the size of the corresponding connection hole are also designed as above, with specific reference to the first barrier dam 133 and the second barrier dam 134, which will not be repeated here.

[0065] Fig.15 is a schematic diagram of the process steps of the method for preparing a display panel provided in the first embodiment of the present application, such as Fig.15 As shown, the present application also discloses a method for preparing a display panel 100, which is used to prepare the display panel 100 as described above, comprising the steps of:

[0066] S1: providing a substrate;

[0067] S2: dividing the substrate into a display area and a packaging area;

[0068] S3: forming a display unit on the substrate corresponding to the display area;

[0069] S4: forming a barrier dam on the substrate corresponding to the packaging area;

[0070] S5: forming an encapsulation layer above the display unit and the barrier dam to cover the display unit and the barrier dam;

[0071] S6: forming a connecting through hole on the packaging layer corresponding to the barrier dam by using a process;

[0072] S7: Arranging a crack detection signal line above the packaging layer, so that the crack detection signal line is connected through the connecting through hole, the barrier dam and the connecting line connecting the signal end of the crack detection sensor.

[0073] Among them, Fig.16 yes Fig.15 A further step flow diagram of step S4 in FIG. Fig.16 As shown, the packaging area includes a perforated area and an edge area, and the step of forming a barrier dam on the substrate corresponding to the packaging area also includes the following steps:

[0074] S41: forming an alignment layer, a panel protection layer, a passivation layer, a connection metal layer and a pixel definition layer stacked in sequence on the substrate corresponding to the perforated area to form a first barrier base;

[0075] S42: etching the pixel definition layer using a process to form a first connection hole and a second connection hole on the pixel definition layer;

[0076] S43: forming a stacked conductive layer and a shielding layer in sequence on the pixel definition layer at positions corresponding to the first connection hole and the second connection hole 187;

[0077] S44: etching part of the blocking layer 132 and part of the conductive layer along a direction perpendicular to the substrate using a process to form two first barrier dams and a second barrier dam that are spaced apart from each other.

[0078] The second barrier base of the edge area 114 is formed synchronously with the first barrier base, and the fourth barrier dam 135 and the fifth barrier dam 136 are also formed synchronously with the first barrier dam 133 and the second barrier dam 134 .

[0079] Fig.17 yes Fig.15 A further step flow diagram of step S6 in FIG. Fig.17 As shown, the step of forming an encapsulation layer above the display unit and the barrier dam includes the steps of:

[0080] S61: forming a first inorganic encapsulation layer corresponding to the display area and the first barrier dam, the second barrier dam, the fourth barrier dam, and the fifth barrier dam;

[0081] S62: forming an organic encapsulation layer on the first inorganic encapsulation layer corresponding to the display area;

[0082] S63: forming a second inorganic encapsulation layer on the organic encapsulation layer, corresponding to the entire surface of the display area and the edge area.

[0083] Therefore, in the step of forming the connecting through hole 141 on the packaging layer 140 corresponding to the blocking dam 130 using the process, the first through hole 142, the second through hole 143, the third through hole 144 and the fourth through hole 145 are etched corresponding to the first blocking dam 133, the second blocking dam 134, the fourth blocking dam 135 and the fifth blocking dam 136.

[0084] After the encapsulation of the encapsulation layer 140 is completed, holes are punched corresponding to the punching areas 113 to form a display panel 100 with holes punched.

[0085] Second embodiment:

[0086] Fig.18 : is a schematic diagram of the top view of the punching area provided in the second embodiment of the present application. Fig.18 As shown, as the second embodiment of the present application, different from the first embodiment, the display panel 100 also includes a second blocking dam 160, the second blocking dam 160 includes a first end 161 and a second end 162, the second blocking dam 160 is arranged around the first blocking dam 150, and a gap 163 is formed between the first end 161 and the second end 162, the first blocking dam body 133 and the second blocking dam body 134 are spaced apart at the gap 163 along the direction from the first end 161 to the second end 162, the first crack detection signal line 121 is arranged along the surrounding direction of the second blocking dam 160 body, and is arranged on the side of the second blocking dam 160 body away from the substrate 110, one end of the first crack detection signal line 121 is connected to the connecting line 410 of the first input end through the first through hole 142 and the first blocking dam body 133, and the other end of the first crack detection signal line 121 is connected to the connecting line 420 of the first output end through the second through hole 143 and the second blocking dam body 134. The height of the second barrier dam 160 is consistent with the height of the first barrier dam body 133 and the second barrier dam body 134 , so that the first crack detection signal line 121 can be laid flat on the second barrier dam 160 , which is overall flat and further ensures the service life of the crack detection signal line 120 .

[0087] Third embodiment:

[0088] Fig.19 : is a schematic diagram of the top view of the punching area provided in the second embodiment of the present application. Fig.19 As shown, as the third embodiment of the present application, different from the first and second embodiments, the barrier dam body 130 includes a first barrier dam body 133, a second barrier dam body 134 and a plurality of third barrier dam bodies 130, the connecting through hole 141 includes a first through hole 142 and a second through hole 143, the first through hole 142 is arranged corresponding to the first barrier dam body 133, and the second through hole 143 is arranged corresponding to the second barrier dam body 134; the crack detection signal line 120 includes a first crack detection signal line 121, the signal end includes a first input end and a first output end, the first barrier dam 150 is arranged at least one circle around the punching area 113, the first barrier dam body 133, the second barrier dam body 134 and a plurality of third barrier dam bodies 130 are arranged around the first barrier dam 150, and the first The blocking dam body 133 and the second blocking dam body 134 are arranged at intervals, and the first crack detection signal line 121 is arranged along the surrounding direction of the multiple third blocking dam bodies 130, and is arranged on the side of the multiple third blocking dam bodies 130 away from the substrate 110. One end of the first crack detection signal line 121 is connected to the connecting line 410 of the first input end through the first through hole 142 and the first blocking dam body 133, and the other end of the first crack detection signal line 121 is connected to the connecting line 420 of the first output end through the second through hole 143 and the second blocking dam body 134. In this way, the first crack detection signal line 121 can also be raised by the multiple third blocking dam bodies 130, so that the entire crack detection signal line 120 is also in a relatively flat state, and the flatness of the subsequent packaging layer 140 can also be ensured.

[0089] It should be noted that the limitations on the various steps involved in this solution, without affecting the implementation of the specific solution, are not deemed to limit the order of the steps. The steps written in front can be executed first, or later, or even simultaneously. As long as this solution can be implemented, it should be deemed to fall within the scope of protection of this application.

[0090] It should be noted that the inventive concept of the present application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the embodiments or technical features are combined, the original technical effects will be enhanced.

[0091] The above content is a further detailed description of the present application in combination with specific optional implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. A display panel, characterized in that: The invention comprises a substrate, a display unit, a blocking dam, a packaging layer and a crack detection signal line, wherein the substrate is divided into a display area and a packaging area, the display unit is arranged in the display area, the packaging layer covers the display unit and the packaging area, the blocking dam is arranged between the packaging layer and the substrate, the crack detection signal line is arranged on a side of the packaging layer away from the blocking dam and surrounds the packaging area, wherein A connecting through hole is provided on the packaging layer corresponding to the barrier dam body, and the crack detection signal line is conducted through the connecting through hole and the connecting line connecting the barrier dam body and the signal end of the crack detection sensor.

2. The display panel according to claim 1, wherein: The barrier dam body is made of conductive material.

3. The display panel according to claim 2, wherein: The encapsulation area includes a perforated area, the display panel also includes a first blocking dam, the blocking dam body includes a first blocking dam body and a second blocking dam body, the connecting through hole includes a first through hole and a second through hole, the first through hole is arranged corresponding to the first blocking dam body, and the second through hole is arranged corresponding to the second blocking dam body; the crack detection signal line includes a first crack detection signal line, the signal end includes a first input end and a first output end, the first blocking dam is arranged around the perforated area at least once, the first blocking dam body and the second blocking dam body are arranged at intervals along the direction of the first blocking dam surrounding, and are located on the side of the first blocking dam away from the perforated area, one end of the first crack detection signal line is connected through the first through hole, the first blocking dam body and the connecting line of the first input end, and the other end of the first crack detection signal line is connected through the second through hole, the second blocking dam body and the connecting line of the first output end.

4. The display panel according to claim 2, wherein: The encapsulation area includes a perforated area, the display panel also includes a first blocking dam and a second blocking dam, the blocking dam body includes a first blocking dam body and a second blocking dam body, the connecting through hole includes a first through hole and a second through hole, the first through hole is arranged corresponding to the first blocking dam body, and the second through hole is arranged corresponding to the second blocking dam body; the crack detection signal line includes a first crack detection signal line, the signal end includes a first input end and a first output end, the first blocking dam is arranged around the perforated area at least once, the second blocking dam includes a first end and a second end, the second blocking dam is arranged around the first blocking dam, and a gap is formed between the first end and the second end, the first blocking dam body and the second blocking dam body are arranged at intervals at the gap along a direction from the first end to the second end, the first crack detection signal line is arranged along the surrounding direction of the second blocking dam body, and is arranged on a side of the second blocking dam body away from the substrate, one end of the first crack detection signal line is connected to the connecting line of the first input end through the first through hole and the first blocking dam body, and the other end of the first crack detection signal line is connected to the connecting line of the first output end through the second through hole and the second blocking dam body.

5. The display panel according to claim 2, wherein: The encapsulation area includes a perforated area, the display panel also includes a first blocking dam, the blocking dam body includes a first blocking dam body, a second blocking dam body and a plurality of third blocking dam bodies, the connecting through hole includes a first through hole and a second through hole, the first through hole is arranged corresponding to the first blocking dam body, and the second through hole is arranged corresponding to the second blocking dam body; the crack detection signal line includes a first crack detection signal line, the signal end includes a first input end and a first output end, the first blocking dam is arranged around the perforated area at least once, the first blocking dam body, the second blocking dam body and a plurality of third blocking dam bodies are arranged around the first blocking dam, and the first blocking dam body and the second blocking dam body are arranged at intervals, the first crack detection signal line is arranged along the surrounding direction of the plurality of third blocking dam bodies, and is arranged on a side of the plurality of third blocking dam bodies away from the substrate, one end of the first crack detection signal line is connected through the first through hole, the first blocking dam body and the connecting line of the first input end, and the other end of the first crack detection signal line is connected through the second through hole, the second blocking dam body and the connecting line of the first output end.

6. The display panel according to claim 3, 4 or 5, characterized in that: The encapsulation area further includes an edge area, the barrier dam further includes a fourth barrier dam and a fifth barrier dam, the display panel further includes a third barrier dam, the third barrier dam is arranged on a side of the edge area away from the display area, and surrounds the display area in a circle; the fourth barrier dam and the fifth barrier dam are arranged between the display area and the third barrier dam, and are spaced apart in a direction around the third barrier dam; The connecting through hole comprises a third through hole and a fourth through hole, the third through hole is arranged corresponding to the fourth barrier dam, and the fourth through hole is arranged corresponding to the fifth barrier dam; The crack detection signal line also includes a second crack detection signal line, which is arranged around the display area and the third blocking dam. The signal end also includes a second input end and a second output end. One end of the second crack detection signal line is connected to the connecting line of the second input end through the third through hole, the fourth blocking dam body, and the other end of the second crack detection signal line is connected to the connecting line of the second output end through the fourth through hole, the fifth blocking dam body.

7. The display panel according to claim 3 or 4 or 5 or 6, characterized in that: The display panel further includes a third crack detection signal line, and the barrier dam further includes a sixth barrier dam and a seventh barrier dam, wherein the sixth barrier dam and the seventh barrier dam are arranged at intervals along a direction surrounding the perforated area on a side of the first barrier dam and the second barrier dam away from the perforated area, and the sixth barrier dam and the seventh barrier dam are arranged in a staggered manner with the first barrier dam and the second barrier dam; The connecting through hole further includes a fifth through hole and a sixth through hole, the fifth through hole is arranged corresponding to the sixth barrier dam, and the sixth through hole is arranged corresponding to the seventh barrier dam; the signal end further includes a third input end and a third output end; The third crack detection signal line is arranged around the first crack detection signal line, one end of the third crack detection signal line is connected to the connecting line of the third input end through the fifth through hole and the sixth barrier dam, and the other end of the third crack detection signal line is connected to the connecting line of the third output end through the sixth through hole and the seventh barrier dam.

8. The display panel according to claim 6, wherein: The display panel further comprises a first barrier seat and a second barrier seat, wherein the first barrier seat is arranged in the perforated area and located between the first barrier dam, the second barrier dam and the substrate, and the second barrier seat is arranged in the edge area and located between the fourth barrier dam and the fifth barrier dam; The encapsulation layer comprises a first inorganic encapsulation layer and a second inorganic encapsulation layer stacked in sequence, the first through hole, the second through hole, the third through hole and the fourth through hole all penetrate the first inorganic encapsulation layer and the second inorganic encapsulation layer in a direction perpendicular to the substrate, the first barrier seat comprises an alignment layer, a panel protection layer, a first passivation layer, a first connection metal layer and a first pixel definition layer stacked, the connection line of the first input end and the connection line of the first output end are both electrically connected to the first connection metal layer; the second barrier seat comprises a second passivation layer, a second connection metal layer and a second pixel definition layer stacked, the connection line of the second input end and the connection line of the second output end are both electrically connected to the second connection metal layer; The first pixel definition layer corresponds to the first barrier dam, and a first connection hole is formed by penetrating the first pixel definition layer in a direction perpendicular to the substrate. A part of the conductive layer of the first barrier dam is located in the first connection hole, and cooperates with the first connection hole to form a first connection area; the first pixel definition layer corresponds to the second barrier dam, and a second connection hole is formed by penetrating the first pixel definition layer in a direction perpendicular to the substrate. The conductive layer of the second barrier dam is located in the second connection hole, and cooperates with the first connection hole to form a second connection area. One end of the first crack detection signal line is connected to the first connection metal layer through the first through hole, the first barrier dam and the first connection area, and the other end of the first crack detection signal line is connected to the first connection metal layer through the second through hole, the second barrier dam and the second connection area; The second pixel definition layer corresponds to the fourth barrier dam, and a third connection hole is formed by penetrating the second pixel definition layer in a direction perpendicular to the substrate. A portion of the conductive layer of the fourth barrier dam is located in the third connection hole, and cooperates with the third connection hole to form a third connection area; the second pixel definition layer corresponds to the fifth barrier dam, and a fourth connection hole is formed by penetrating the second pixel definition layer in a direction perpendicular to the substrate. A portion of the conductive layer of the fifth barrier dam is located in the third connection hole, and cooperates with the third connection hole to form a fourth connection area; one end of the second crack detection signal line is connected to the second connection metal layer through the third through hole, the fourth barrier dam and the third connection area, and the other end of the second crack detection signal line is connected to the second connection metal layer through the fourth through hole, the fifth barrier dam and the fourth connection area; The first passivation layer and the second passivation layer are arranged on the same layer, the first connection metal layer and the second connection metal layer are arranged on the same layer, and the first pixel definition layer and the second pixel definition layer are arranged on the same layer.

9. A method for preparing a display panel, used for preparing the display panel according to any one of claims 1 to 8, characterized in that: Includes steps: providing a substrate; Dividing the substrate into a display area and a packaging area; forming a display unit on the substrate corresponding to the display area; forming a barrier dam on the substrate corresponding to the packaging area; forming an encapsulation layer above the display unit and the barrier dam to cover the display unit and the barrier dam; Forming a connecting through hole on the packaging layer corresponding to the barrier dam body by using a process; A crack detection signal line is arranged above the packaging layer, so that the crack detection signal line is connected through the connection through hole, the barrier dam and the connection line connecting the signal end of the crack detection sensor.

10. A display device, characterized in that: Comprising a display panel as described in any one of claims 1-8.

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