Display panel, crack detection method of display panel and display device

Abstract

The invention provides a display panel, a crack detection method of the display panel and a display device. The display panel includes a display area and an edge area surrounding the display area. The display panel comprises at least one signal line located in a display area; the first switch circuit is located in the edge area, the first switch circuit comprises at least one input end and at least one output end, and the output end of the first switch circuit is connected with the signal line; the second switching circuit is located in the edge area, the second switching circuit comprises a first control end and a first output end, and the first output end is connected with at least one input end of the first switching circuit; the at least one detection line is located in the edge area, the first end of the detection line is connected with the first control end, and the second end of the detection line is connected with the detection signal input end. According to the technical scheme, the influence of RC Loading on the detection signal in the signal transmission process is reduced, and the accuracy and reliability of crack detection are improved.

Description

Technical Field

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

[0002] At present, during the production, processing, transportation and assembly of display panels, the edge area of ​​the display panel is more prone to cracking due to possible adverse effects such as collision, extrusion or vibration. This may cause the circuit wiring inside the display panel to be broken, thereby affecting the display quality. Therefore, it is necessary to perform crack detection on the edge of the display panel. The commonly used detection method is to detect through the panel crack detection (PCD) wiring. However, this detection method is easily affected by the resistance and capacitance in the circuit, resulting in low accuracy and reliability of the detection result. Summary of the invention

[0003] In view of this, the embodiments of the present application are directed to providing a display panel, a crack detection method for a display panel, and a display device to solve the problem of low accuracy and reliability of crack detection.

[0004] In a first aspect, the present application provides a display panel, which includes a display area and an edge area surrounding the display area, and the display panel includes: at least one signal line located in the display area; a first switch circuit located in the edge area, the first switch circuit includes at least one input terminal and at least one output terminal, and the output terminal of the first switch circuit is connected to the signal line; a second switch circuit located in the edge area, the second switch circuit includes a first control terminal and a first output terminal, and the first output terminal is connected to at least one input terminal of the first switch circuit; at least one detection line located in the edge area, the first end of the detection line is connected to the first control terminal, and the second end of the detection line is connected to the detection signal input terminal.

[0005] In one embodiment, the first switching circuit includes a first input terminal, a second control terminal and a second output terminal, the second output terminal is connected to at least one signal line, the first input terminal is connected to the first output terminal, the second control terminal is connected to the first switching signal, the first switching circuit includes at least one first switching device, the control electrode of the first switching device is connected to the second control terminal, the first electrode of the first switching device is connected to the first input terminal, and the second electrode of the first switching device is connected to the second output terminal.

[0006] In one embodiment, the display panel also includes at least one sub-pixel, which is located in the display area, and the sub-pixel is connected to the signal line; the first switching circuit also includes a second input terminal and at least one third output terminal, the second input terminal is connected to the data signal, and the third output terminal is connected to at least one signal line, and the first switching circuit also includes at least one second switching device, the control electrode of the second switching device is connected to the second control terminal, the first electrode of the second switching device is connected to the second input terminal, and the second electrode of the second switching device is connected to the third output terminal; preferably, at least one third output terminal includes multiple third output terminals, at least one second switching device includes multiple second switching devices, the control electrodes of the multiple second switching devices are connected in series and connected to the second control terminal, the first electrodes of the multiple second switching devices are connected to the second input terminal, and the second electrodes of the multiple second switching devices are connected one by one to the multiple third output terminals.

[0007] In one embodiment, the second switching circuit includes a third input terminal, the third input terminal is connected to the data signal, the second switching circuit includes a third switching device, the control electrode of the third switching device is connected to the first control terminal, the first electrode of the third switching device is connected to the third input terminal, and the second electrode of the third switching device is connected to the first output terminal; preferably, the third switching device includes a P-type switching device or an N-type switching device.

[0008] In one embodiment, at least one signal line includes at least one first signal line and at least one second signal line, at least one sub-pixel includes at least one first sub-pixel and at least one second sub-pixel, the first end of the first signal line is connected to the first sub-pixel, the second end of the first signal line is connected to the second output terminal, the first end of the second signal line is connected to the second sub-pixel, and the second end of the second signal line is connected to the third output terminal; preferably, at least one second signal line includes multiple second signal lines, the second ends of the multiple second signal lines are connected to the multiple third output terminals one by one, at least one second sub-pixel includes multiple second sub-pixels, and the first ends of the multiple second signal lines are connected to the multiple second sub-pixels one by one; preferably, the signal line includes a data signal line.

[0009] In one embodiment, at least one detection line surrounds at least half of the display area.

[0010] A second aspect of the present application provides a method for crack detection of a display panel, wherein the display panel is any of the display panels mentioned in the above embodiments, and the crack detection method comprises: inputting a detection signal to a detection signal input terminal; and determining that a crack exists in the display panel when the brightness state of the display area does not change.

[0011] In one embodiment, the crack detection method further includes: determining whether there is no crack in the display panel when the light and dark state of the display area changes.

[0012] In one embodiment, for the display panel mentioned in any of the above embodiments, after the step of inputting a detection signal to the detection signal input terminal, and before the step of determining whether a crack exists in the display panel when the brightness state of the display area does not change, the crack detection method further includes: inputting a first switch signal to the second control terminal; and inputting a data signal to the second input terminal.

[0013] A third aspect of the present application provides a display device, comprising: a display panel as mentioned in any of the above embodiments.

[0014] The technical solution provided by the present application sets a first switch circuit, a second switch circuit and a detection line in the edge area of ​​the display panel, and the three together constitute a crack detection module. The detection signal is routed along the periphery of the display panel to control the on-off state of the second switch circuit, so that the brightness and darkness of the display area are further controlled by the first switch circuit. By judging whether the brightness and darkness of the display area change, it can be judged whether there is a crack on the edge of the display panel. Since the detection signal in the present application is used as the control signal of the second switch circuit and is not connected to the circuit of the display panel, the influence of RC Loading during signal transmission is reduced, and compared with the prior art, the accuracy and reliability of crack detection are improved.

[0015] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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.

[0017] Figure 1 Shown is a schematic structural diagram of a display panel provided in one embodiment of the present application.

[0018] Figure 2 Shown is a schematic structural diagram of a display panel provided in another embodiment of the present application.

[0019] Figure 3 Shown is a schematic structural diagram of a display panel provided in yet another embodiment of the present application.

[0020] Figure 4 Shown is a schematic structural diagram of a display panel provided in yet another embodiment of the present application.

[0021] Figure 5Shown is a schematic structural diagram of a display panel provided in yet another embodiment of the present application.

[0022] Figure 6 Shown is a schematic structural diagram of a display panel provided in yet another embodiment of the present application.

[0023] Figure 7 FIG. 1 is a flow chart of a method for detecting cracks in a display panel provided in accordance with an embodiment of the present application.

[0024] Figure 8 FIG. 1 is a schematic flow chart of a method for detecting cracks in a display panel provided in another embodiment of the present application.

[0025] Fig. 9 FIG. 1 is a flow chart of a method for detecting cracks in a display panel provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0027] Figure 1 FIG. 1 is a schematic diagram of the structure of a display panel provided by an embodiment of the present application. Figure 1 As shown, the display panel 100 includes a display area 101 and an edge area 102 surrounding the display area 101. The display panel 100 includes: at least one signal line 103, located in the display area 101; a first switch circuit 105, located in the edge area 102, the first switch circuit 105 includes at least one input terminal Inp and at least one output terminal Outp, and the output terminal of the first switch circuit 105 is connected to the signal line 103; a second switch circuit 106, located in the edge area 102, the second switch circuit 106 includes a first control terminal S1 and a first output terminal Out1, and the first output terminal Out1 is connected to at least one input terminal Inp of the first switch circuit 105; at least one detection line 107, located in the edge area 102, the first end of the detection line 107 is connected to the first control terminal S1, and the second end of the detection line 107 is connected to the detection signal input terminal In4.

[0028] Specifically, the display area 101 of the display panel 100 is used to display images, while the edge area 102 is used to arrange related circuits and lines. At least one signal line 103 is arranged in the display area 101 for transmitting signals such as pixel data.

[0029] A first switch circuit 105 is provided in the edge region 102, and at least one output terminal Outp thereof is connected to a signal line 103 located in the display region 101, so as to control the brightness state of at least one sub-pixel 104. A second switch circuit 106 is provided in the edge region 102, and a first output terminal Out1 thereof is connected to at least one input terminal Inp of the first switch circuit 105, so as to control the on-off state of the first switch circuit 105. At least one detection line 107 is provided in the edge region 102, and the detection line 107 is routed around at least part of the periphery of the display panel 100. The second end of the detection line 107 is connected to the detection signal input terminal In4 to receive the detection signal, and the first end thereof is connected to the first control terminal S1 to control the on-off state of the first switch circuit 105. The first switch circuit 105, the second switch circuit 106 and the at least one detection line 107 together constitute a crack detection module, and perform crack detection on the display panel 100.

[0030] Exemplarily, the working principle of the crack detection module can be: at least one detection line 107 is connected to a detection signal, and the detection signal is routed along the periphery of the display panel 100. If there is a crack at the edge of the display panel 100, the detection line 107 is disconnected, and the detection signal will not be transmitted to the first control terminal S1 of the second switch circuit 106. At this time, the second switch circuit 106 is in an off state, and its first output terminal Out1 will not output a signal to the input terminal Inp of the first switch circuit 105, so that the on-off state of the first switch circuit 105 is uncontrolled, and at least one output terminal Outp of the first switch circuit 105 is connected to at least one signal line 103 located in the display area 101, and the light and dark state of the display area 101 will not change. If there is no crack at the edge of the display panel 100, the detection line 107 transmits the detection signal normally, and the detection signal is transmitted to the first control terminal S1 of the second switch circuit 106 to control the second switch circuit 106 to be turned on. At this time, the first output terminal Out1 of the second switch circuit 106 outputs a signal to the input terminal Inp of the first switch circuit 105, so that the on-off state of the first switch circuit 105 is controlled to change, and the light and dark state of the display area 101 is controlled to change. Therefore, by judging whether the light and dark state of the display area 101 changes, it can be judged whether there is a crack at the edge of the display panel 100.

[0031] After long-term research, the inventors found that in the related art, the crack detection line is connected back to the detection circuit after being routed around the display panel 100 for one circle. The signal transmission path in the line is long and is easily affected by the resistance-capacitance load (RC Loading). There is a large difference between the signal normally connected to the circuit, which makes it impossible to accurately judge whether the crack detection line is broken, thereby reducing the accuracy and reliability of crack detection. After the detection signal in this embodiment is routed around the display panel 100, it is not directly connected to the circuit of the display panel 100, but is used as a control signal of the second switch circuit 106 to control the on-off state of the second switch circuit 106. Therefore, the detection signal can be set as a switch signal, which reduces the influence of RC Loading during signal transmission, thereby improving the accuracy and reliability of crack detection.

[0032] The technical solution provided in this embodiment sets a first switch circuit 105, a second switch circuit 106 and a detection line 107 in the edge area 102 of the display panel 100, and the three together constitute a crack detection module. The detection signal is routed along the periphery of the display panel 100 to control the on-off state of the second switch circuit 106, so that the light and dark state of the display area 101 is further controlled by the first switch circuit 105. By judging whether the light and dark state of the display area 101 changes, it can be judged whether there is a crack at the edge of the display panel 100. Since the detection signal in this embodiment is used as a control signal of the second switch circuit 106 and is not connected to the circuit of the display panel 100, the influence of RC Loading during signal transmission is reduced, and compared with the prior art, the accuracy and reliability of crack detection are improved.

[0033] Figure 2 FIG. 2 is a schematic diagram of the structure of a display panel provided by another embodiment of the present application. Figure 2 As shown, the first switch circuit 105 includes a first input terminal In1, a second control terminal S2 and a second output terminal Out2, the second output terminal Out2 is connected to at least one signal line 103, the first input terminal In1 is connected to the first output terminal Out1, the second control terminal S2 is connected to the first switch signal D_SW, the first switch circuit 105 includes at least one first switch device k1, the control electrode of the first switch device k1 is connected to the second control terminal S2, the first electrode of the first switch device k1 is connected to the first input terminal In1, and the second electrode of the first switch device k1 is connected to the second output terminal Out2.

[0034] Specifically, the first input terminal In1 is connected to the first output terminal Out1, and is used to access the signal output by the second switch circuit 106. The second control terminal S2 is connected to the first switch signal D_SW, and illustratively, the first switch signal D_SW can be a low-level gating signal (Video Gate Low, VGL). The control electrode of the first switch device k1 is connected to the first switch signal D_SW, the first electrode of the first switch device k1 is connected to the signal output by the first output terminal Out1, and the second electrode of the first switch device k1 outputs the signal to the signal line 103 connected to the first switch device k1.

[0035] When at least one detection line 107 is connected to a detection signal, the detection signal is routed along the periphery of the display panel 100. If there is a crack at the edge of the display panel 100, the detection line 107 is disconnected, and the detection signal will not be transmitted to the first control terminal S1 of the second switch circuit 106. At this time, the second switch circuit 106 is in an off state, and its first output terminal Out1 does not output a signal. The first pole of the first switch device k1 is in a suspended state, so that the on-off state of the first switch device k1 is not controlled, and the light and dark state of the display area 101 will not change. If there is no crack at the edge of the display panel 100, the detection line 107 transmits the detection signal normally, and the detection signal is transmitted to the first control terminal S1 of the second switch circuit 106 to control the second switch circuit 106 to turn on. At this time, the first output terminal Out1 of the second switch circuit 106 outputs a signal to the first pole of the first switch device k1, so that the on-off state of the first switch device k1 is controlled to change, and the light and dark state of the display area 101 is controlled to change. Therefore, by determining whether the brightness and darkness of the display area 101 remain unchanged, it is possible to determine whether there is a crack at the edge of the display panel 100 .

[0036] In this embodiment, by setting the first switch device k1 in the first switch circuit 105 and controlling the on-off state of the first switch device k1, the on-off state between the first output terminal Out1 and the signal line 103 can be controlled, thereby controlling the brightness of the display area 101. The crack detection result of the display panel 100 can be obtained based on the brightness change of the display area 101. This arrangement makes the structure of the first switch circuit 105 simpler and the technical solution easy to implement.

[0037] Figure 3 FIG. 2 is a schematic diagram of the structure of a display panel provided by another embodiment of the present application. Figure 3As shown, the display panel also includes at least one sub-pixel 104, which is located in the display area 101, and the sub-pixel 104 is connected to the signal line 103; the first switch circuit 105 also includes a second input terminal In2 and at least one third output terminal Out3, the second input terminal In2 is connected to the data signal D_G, and the third output terminal Out3 is connected to at least one signal line 103, the first switch circuit 105 also includes at least one second switch device k2, the control electrode of the second switch device k2 is connected to the second control terminal S2, the first electrode of the second switch device k2 is connected to the second input terminal In2, and the second electrode of the second switch device k2 is connected to the third output terminal Out3; preferably, at least one third output terminal Out3 includes multiple third output terminals Out3, at least one second switch device k2 includes multiple second switch devices k2, the control electrodes of the multiple second switch devices k2 are connected in series and connected to the second control terminal S2, the first electrodes of the multiple second switch devices k2 are connected to the second input terminal In2, and the second electrodes of the multiple second switch devices k2 are connected one by one to the multiple third output terminals Out3.

[0038] Specifically, the second input terminal In2 is connected to the data signal D_G. Exemplarily, the data signal D_G can be a high-level gating signal (Video Gate High, VGH). The control electrodes of multiple second switch devices k2 are connected in series and are all connected to the first switch signal D_SW. The first electrodes of multiple second switch devices k2 are all connected to the second input terminal In2 and are connected to the data signal D_G. The second electrode of each second switch device k2 is respectively connected to a different third output terminal Out3, and outputs a signal to the signal line 103 connected to the second switch device k2. At least one sub-pixel 104 is set in the display area 101 as a basic display unit of the display panel 100. The multiple sub-pixels 104 can work together to display text, images, videos and other forms of digital content through different arrangements and brightness control.

[0039] If there is a crack on the edge of the display panel 100, the on-off state of the first switch device k1 is not controlled, and the light and dark state of the sub-pixel 104 connected to the second output terminal Out2 will not change, while the on-off state of the second switch device k2 is controlled by the first switch signal D_SW, and the second switch device k2 works normally. The third output terminal Out3 outputs a signal to the signal line 103 connected to the second switch device k2 to control the light and dark state of the sub-pixel 104 to change, and the display panel 100 has an obvious light and dark line phenomenon. If there is no crack on the edge of the display panel 100, the on-off state of the first switch device k1 and the second switch device k2 are both controlled by the first switch signal D_SW, and the light and dark state of multiple sub-pixels 104 in the display panel 100 change consistently, and the display panel 100 has no obvious light and dark line phenomenon. Therefore, by judging whether there is a light and dark line in the display panel 100, it can be judged whether there is a crack on the edge of the display panel 100.

[0040] In this embodiment, by setting the second switch device k2 in the first switch circuit 105 to control the brightness state of the sub-pixel 104 connected to the second switch device k2, when performing crack detection on the display panel 100, by comparing the brightness state changes of the sub-pixel 104 controlled by the first switch device k1 and the sub-pixel 104 controlled by the second switch device k2, the crack detection result of the display panel 100 can be obtained. Such a setting is further conducive to improving the accuracy and reliability of crack detection.

[0041] Figure 4 FIG. 2 is a schematic diagram of the structure of a display panel provided by another embodiment of the present application. Figure 4 As shown, the second switch circuit 106 includes a third input terminal In3, the third input terminal In3 is connected to the data signal D_G, the second switch circuit 106 includes a third switch device k3, the control electrode of the third switch device k3 is connected to the first control terminal S1, the first electrode of the third switch device k3 is connected to the third input terminal In3, and the second electrode of the third switch device k3 is connected to the first output terminal Out1; preferably, the third switch device k3 includes a P-type switch device or an N-type switch device.

[0042] Specifically, the first electrode of the third switch device k3 is connected to the third input terminal In3 and receives the data signal D_G.

[0043] If there is a crack at the edge of the display panel 100, the control electrode of the third switch device k3 is not connected to a signal, and the third switch device k3 is in an off state. The second electrode of the third switch device k3 does not output a signal, so that the on-off state of the first switch device k1 is not controlled, and the light and dark state of the sub-pixel 104 connected to the second output terminal Out2 does not change. If there is no crack at the edge of the display panel 100, the control electrode of the third switch device k3 is connected to a signal, and the third switch device k3 is turned on. The second electrode of the third switch device k3 outputs a signal to control the on-off state of the first switch device k1, thereby controlling the light and dark state of the sub-pixel 104 connected to the second output terminal Out2 to change. Therefore, by judging whether the light and dark state of at least one sub-pixel 104 in the display area 101 is unchanged, it can be judged whether there is a crack at the edge of the display panel 100.

[0044] Exemplarily, the detection signal may be VGL or VGH. The potential of the detection signal is related to the type of the third switch device k3. For example, if the third switch device k3 is a P-type switch device, the detection signal is VGL; if the third switch device k3 is an N-type switch device, the detection signal is VGH.

[0045] In this embodiment, by setting the third switch device k3 in the second switch circuit 106, the detection signal is used to control the on-off state of the third switch device k3, thereby controlling the brightness and darkness of the sub-pixel 104 connected to the first switch device k1. When crack detection is performed on the display panel 100, the crack detection result of the display panel 100 can be obtained based on the change in the brightness and darkness of the sub-pixel 104. This arrangement makes the structure of the second switch circuit 106 simpler and the technical solution easy to implement.

[0046] Figure 5 FIG. 2 is a schematic diagram of the structure of a display panel provided by another embodiment of the present application. Figure 5 As shown, at least one signal line 103 includes at least one first signal line 110 and at least one second signal line 120, at least one sub-pixel 104 includes at least one first sub-pixel 111 and at least one second sub-pixel 121, the first end of the first signal line 110 is connected to the first sub-pixel 111, the second end of the first signal line 110 is connected to the second output terminal Out2, the first end of the second signal line 120 is connected to the second sub-pixel 121, and the second end of the second signal line 120 is connected to the third output terminal Out3; preferably, at least one second signal line 120 includes multiple second signal lines 120, the second ends of the multiple second signal lines 120 are connected to the multiple third output terminals Out3 one by one, at least one second sub-pixel 121 includes multiple second sub-pixels 121, the first ends of the multiple second signal lines 120 are connected to the multiple second sub-pixels 121 one by one; preferably, the signal line 103 includes a data signal line 103.

[0047] Specifically, the first sub-pixel 111 is connected to the first signal line 110, and the light and dark state of the first sub-pixel 111 is controlled by the output signal of the second output terminal Out2. The second sub-pixel 121 is connected to the second signal line 120, and the light and dark state of the second sub-pixel 121 is controlled by the output signal of the third output terminal Out3. Exemplarily, the first signal line 110 and / or the second signal line 120 can be a data signal line.

[0048] If there is a crack at the edge of the display panel 100, the second output terminal Out2 outputs a signal to the first signal line 110, and the light and dark state of the first sub-pixel 111 cannot be controlled to change. The third output terminal Out3 outputs a signal to the second signal line 120 to control the light and dark state of the second sub-pixel 121 to change, and the display panel 100 has an obvious light and dark line phenomenon. If there is no crack at the edge of the display panel 100, the second output terminal Out2 outputs a signal to the first signal line 110 to control the light and dark state of the first sub-pixel 111 to change, and the third output terminal Out3 outputs a signal to the second signal line 120 to control the light and dark state of the second sub-pixel 121 to change, and the display panel 100 does not have an obvious light and dark line phenomenon. Therefore, by judging whether there is a light and dark line in the display panel 100, it can be judged whether there is a crack at the edge of the display panel 100. By setting a plurality of second signal lines 120 and a plurality of second sub-pixels 121, the light and dark lines of the display panel 100 can be made more obvious and easy to observe.

[0049] In this embodiment, at least one first signal line 110 and at least one second signal line 120 are provided to respectively connect the first sub-pixel 111 and the second sub-pixel 121. When crack detection is performed on the display panel 100, the crack detection result of the display panel 100 can be obtained by comparing the changes in the light and dark states of the first sub-pixel 111 and the second sub-pixel 121. Such a configuration is further conducive to improving the accuracy and reliability of crack detection.

[0050] In one embodiment, see Figure 5 , at least one detection line 107 surrounds the display area 101 for at least half a circle.

[0051] Specifically, at least one detection line 107 is arranged to be arranged around the display area 101 at a distance of at least half the circumference of the display area 101 , so that crack detection can be performed on at least half of the edge area 102 of the display panel 100 .

[0052] Further, the at least one detection line 107 may include two detection lines 107 . Figure 6 is a schematic diagram of the structure of a display panel provided by another embodiment of the present application. Figure 6As shown, the two detection lines 107 can be respectively routed from opposite sides of the display panel 100, and each detection line 107 surrounds half of the display area 101. In this way, when a crack appears at any position of the edge area 102, the detection line 107 at the corresponding position will be disconnected. Therefore, cracks at any position of the entire edge area 102 can be detected, preventing the missed detection of cracks in the edge area 102, and further improving the accuracy and reliability of crack detection.

[0053] Figure 7 FIG. 1 is a flow chart of a method for detecting cracks in a display panel provided in an embodiment of the present application. The method is applicable to detecting cracks in a display panel mentioned in any of the above embodiments. Figure 7 As shown, the crack detection method includes:

[0054] S110, inputting a detection signal to a detection signal input terminal.

[0055] Specifically, a detection signal is input to the detection signal input terminal, and at least one detection line is connected to the detection signal. The detection signal is routed along the periphery of the display panel.

[0056] S120: When the brightness state of the display area does not change, determine that a crack exists in the display panel.

[0057] Specifically, when the brightness of the display area does not change, it means that the on / off state of the first switch circuit is not controlled. Therefore, it can be determined that the input end of the first switch circuit has no input signal, that is, the first output end has no output signal, the second switch circuit is in an off state, and the first control end has no input detection signal. Therefore, it can be determined that the detection line has a breakpoint, that is, there is a crack on the edge of the display panel.

[0058] The technical solution provided in this embodiment inputs a detection signal to the detection signal input terminal, and determines that there is a crack in the display panel when the brightness and darkness state of the display area does not change. Since the detection signal controls the on-off state of the second switch circuit after being routed along the periphery of the display panel, the brightness and darkness state of the display area is further controlled by the first switch circuit. Therefore, by judging that the brightness and darkness state of the display area does not change, it can be judged that there is a crack at the edge of the display panel. Since the detection signal in this embodiment is used as a control signal of the second switch circuit and is not connected to the circuit of the display panel, the influence of RC Loading during signal transmission is reduced, and compared with the prior art, the accuracy and reliability of crack detection are improved.

[0059] Figure 8 FIG. 2 is a flow chart of a method for detecting cracks in a display panel provided in another embodiment of the present application. The method is applicable to detecting cracks in the display panel mentioned in any of the above embodiments. Figure 8As shown, the crack detection method also includes:

[0060] S130, when the light and dark state of the display area changes, determining whether there is no crack in the display panel.

[0061] Specifically, when the brightness of the display area changes, it means that the on-off state of the first switch circuit is normally controlled by the output signal of the second switch circuit. Therefore, the second switch circuit is in the on state, and the first control terminal is normally connected to the detection signal. Therefore, it can be judged that there is no break point in the detection line, that is, there is no crack on the edge of the display panel.

[0062] The technical solution in this embodiment determines that there is no crack in the display panel when the brightness and darkness of the display area changes. This is because the detection signal is routed along the periphery of the display panel to control the on-off state of the second switch circuit, thereby further controlling the brightness and darkness of the display area through the first switch circuit. Therefore, by determining that the brightness and darkness of the display area has changed, it can be determined that there is no crack at the edge of the display panel. Further, it is conducive to improving the accuracy and reliability of crack detection.

[0063] Fig. 9 FIG. 2 is a flow chart of a method for detecting cracks in a display panel provided by another embodiment of the present application, and the method is applicable to detecting cracks in the display panel mentioned in any of the above embodiments. Fig. 9 As shown, after the step of inputting the detection signal to the detection signal input terminal, before the step of determining whether the display panel has a crack when the brightness state of the display area does not change, the crack detection method further includes:

[0064] S140, inputting a first switch signal to the second control terminal.

[0065] Specifically, the first switch signal is input to the second control terminal, so that the on-off state of the first switch device is controlled by the first switch signal. If there is a crack on the edge of the display panel, the first pole of the first switch device is in a suspended state, so that the on-off state of the first switch device is not controlled, and the light and dark state of the display area will not change. If there is no crack on the edge of the display panel, the first pole of the first switch device is connected to the output signal of the first output terminal, so that the on-off state of the first switch device is controlled to change, and the light and dark state of the display area is controlled to change.

[0066] S150, input a data signal to the second input terminal.

[0067] Specifically, a data signal is input to the second input terminal so that the second switch device normally controls the light and dark state of the sub-pixel connected thereto. If there is a crack on the edge of the display panel, the on-off state of the first switch device is not controlled, and the light and dark state of the sub-pixel connected to the second output terminal will not change. The on-off state of the second switch device is controlled by the first switch signal, and the second switch device works normally, then the light and dark state of the sub-pixel connected to the third output terminal changes, and the display panel has obvious light and dark line phenomenon. If there is no crack on the edge of the display panel, the on-off state of the first switch device and the second switch device are both controlled by the first switch signal, the light and dark state of multiple sub-pixels in the display panel change consistently, and the display panel has no obvious light and dark line phenomenon. Therefore, by judging whether there are light and dark lines in the display panel, it is possible to judge whether there are cracks on the edge of the display panel.

[0068] In this embodiment, by inputting the first switch signal to the second control terminal, the first switch device works normally when the first pole thereof is connected to the signal, and its on-off state is not controlled when the first pole thereof is suspended. By inputting the data signal to the second input terminal, the second switch device works normally. When there is a crack in the display panel, the light and dark states of the sub-pixel controlled by the first switch device and the sub-pixel controlled by the second switch device are inconsistent. When crack detection is performed on the display panel, the crack detection result of the display panel can be obtained by comparing the changes in the light and dark states of the sub-pixel controlled by the first switch device and the sub-pixel controlled by the second switch device. This arrangement is further conducive to improving the accuracy and reliability of crack detection.

[0069] The embodiment of the present application further provides a display device, comprising: a display panel as mentioned in any of the above embodiments. The display device has the beneficial effects of the display panel mentioned in any of the above embodiments, and its technical principles and effects are similar, which will not be repeated here.

[0070] The display panel can be applied to a display device, which may be, for example, a mobile terminal, a tablet computer, a computer monitor, a television, a wearable device, an information query machine or other products or components.

[0071] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0072] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A display panel, characterized in that: The display panel comprises a display area and an edge area surrounding the display area, and the display panel comprises: at least one signal line, located in the display area; A first switch circuit is located in the edge area, the first switch circuit comprises at least one input terminal and at least one output terminal, and the output terminal of the first switch circuit is connected to the signal line; a second switch circuit, located in the edge area, the second switch circuit comprising a first control terminal and a first output terminal, the first output terminal being connected to at least one input terminal of the first switch circuit; At least one detection line is located in the edge area, a first end of the detection line is connected to the first control end, and a second end of the detection line is connected to a detection signal input end.

2. The display panel according to claim 1, characterized in that: The first switch circuit includes a first input terminal, a second control terminal and a second output terminal, the second output terminal is connected to the at least one signal line, the first input terminal is connected to the first output terminal, the second control terminal is connected to a first switch signal, the first switch circuit includes at least one first switch device, the control electrode of the first switch device is connected to the second control terminal, the first electrode of the first switch device is connected to the first input terminal, and the second electrode of the first switch device is connected to the second output terminal.

3. The display panel according to claim 2, characterized in that: The first switch circuit also includes at least one sub-pixel located in the display area, and the sub-pixel is connected to the signal line; the first switch circuit also includes a second input terminal and at least one third output terminal, the second input terminal is connected to a data signal, and the third output terminal is connected to the at least one signal line; the first switch circuit also includes at least one second switch device, the control electrode of the second switch device is connected to the second control terminal, the first electrode of the second switch device is connected to the second input terminal, and the second electrode of the second switch device is connected to the third output terminal; Preferably, at least one of the third output terminals includes multiple third output terminals, at least one of the second switching devices includes multiple second switching devices, the control electrodes of the multiple second switching devices are connected in series and connected to the second control terminal, the first electrodes of the multiple second switching devices are connected to the second input terminal, and the second electrodes of the multiple second switching devices and the multiple third output terminals are connected one by one.

4. The display panel according to claim 3, characterized in that: The second switch circuit includes a third input terminal, the third input terminal is connected to the data signal, the second switch circuit includes a third switch device, a control electrode of the third switch device is connected to the first control terminal, a first electrode of the third switch device is connected to the third input terminal, and a second electrode of the third switch device is connected to the first output terminal; Preferably, the third switching device includes a P-type switching device or an N-type switching device.

5. The display panel according to claim 3, characterized in that: The at least one signal line includes at least one first signal line and at least one second signal line, the at least one sub-pixel includes at least one first sub-pixel and at least one second sub-pixel, a first end of the first signal line is connected to the first sub-pixel, a second end of the first signal line is connected to the second output end, a first end of the second signal line is connected to the second sub-pixel, and a second end of the second signal line is connected to the third output end; Preferably, the at least one second signal line includes a plurality of second signal lines, the second ends of the plurality of second signal lines are connected one-to-one to the plurality of third output ends, and the at least one second sub-pixel includes a plurality of second sub-pixels, the first ends of the plurality of second signal lines are connected one-to-one to the plurality of second sub-pixels; Preferably, the signal line includes a data signal line.

6. The display panel according to claim 1, characterized in that: At least one of the detection lines surrounds at least half of the display area.

7. A method for detecting cracks in a display panel, characterized in that: The display panel is the display panel according to any one of claims 1 to 6, and the crack detection method comprises: Inputting a detection signal to the detection signal input terminal; When the light and dark state of the display area does not change, it is determined that there is a crack in the display panel.

8. The crack detection method according to claim 7, characterized in that: Also includes: When the light and dark state of the display area changes, it is determined that there is no crack in the display panel.

9. The crack detection method according to claim 7, characterized in that: The display panel according to claim 3 to claim 5, after the step of inputting the detection signal to the detection signal input terminal and before the step of determining that the display panel has a crack when the brightness state of the display area does not change, further comprises: Inputting a first switch signal to the second control terminal; A data signal is input to the second input terminal.

10. A display device, characterized in that: include: The display panel according to any one of claims 1 to 6.

Images