Display panel, crack detection method thereof, and display device

Abstract

The application provides a display panel, a crack detection method thereof and a display device. The display panel comprises a display structure, a touch structure and a detection unit. The display structure comprises a first detection wire, the touch structure comprises a second detection wire, the first detection wire and the second detection wire are connected in parallel and connected to the detection unit, and are configured to detect electrical parameters of the first detection wire and the second detection wire through a test terminal to determine whether cracks are generated on the display structure and / or the touch structure. At least one detection device is arranged on the first detection wire and the second detection wire, so that the electrical parameters of the first detection wire and the second detection wire are different. The detection unit detects different electrical parameters of the first detection wire and the second detection wire, so that whether cracks are generated on the display structure and / or the touch structure can be determined according to the different electrical parameters, the display position of the cracks can be accurately determined, and the detection effect of the display panel is improved.

Description

TECHNICAL FIELD

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

[0002] With the rapid development of display technology, touch screens have gradually spread in people's lives. In the related art, to detect cracks in a panel, a panel crack detection (PCD) design is usually adopted, which generally involves connecting a crack detection metal trace around the panel. When a crack occurs in the panel, the resistance of the broken crack detection metal trace will increase. In this way, by detecting the resistance change of the crack detection metal trace, the purpose of detecting the crack in the film layer is achieved.

[0003] In the related art, touch screens can be divided into addon mode touch panels and in cell touch panels according to their constituent structures. Among them, the addon mode touch panel includes a touch panel and a display panel, which are produced separately and then laminated together.

[0004] However, the inventors of the present disclosure have found that for an addon mode touch display screen, the crack detection method in the related art cannot accurately determine whether a crack exists in the touch panel or in the display panel. SUMMARY

[0005] Therefore, the present application aims to provide a display panel, a crack detection method thereof, and a display device to partially or completely solve the technical problems in the background art.

[0006] To achieve the above purpose, the present application provides a display panel, which includes a display area and a non-display area surrounding the display area, the non-display area including a binding area arranged on at least one side of the display area, and the display panel including:

[0007] a display structure including a first substrate, a test terminal arranged on the first substrate, and a first detection trace, the test terminal being located in the binding area, and the first detection trace surrounding the display area and being located in the non-display area and connected to the test terminal;

[0008] A touch structure is disposed on the light-emitting side of the display structure, including a second substrate and a second detection trace disposed on the second substrate. The second detection trace surrounds the display area and is located in the non-display area and is connected to the test end so that the first detection trace and the second detection trace are connected in parallel. At least one detection device is disposed on the first detection trace and / or the second detection trace.

[0009] A detection unit, disposed on the first substrate and electrically coupled to the test terminal, is configured to detect the electrical parameters of the first detection trace and the second detection trace through the test terminal to determine whether cracks have occurred on the display structure and / or the touch structure.

[0010] Optionally, the detection unit includes a first pin and a second pin for detecting the electrical parameters, and the test terminal includes a first test terminal and a second test terminal. The first pin is electrically coupled to the first test terminal, and the second pin is electrically coupled to the second test terminal. The electrical parameters of the first detection trace and the second detection trace include the resistance value or conductivity measured between the first test terminal and the second test terminal.

[0011] Optionally, the at least one detection device includes a first resistor disposed on the first detection trace and / or a second resistor disposed on the second detection trace.

[0012] Optionally, the resistance value of the first detection trace equipped with the first resistor is different from the resistance value of the second detection trace equipped with the second resistor.

[0013] Optionally, the resistance of the first detection trace equipped with the first resistor is more than twice the resistance of the second detection trace equipped with the second resistor.

[0014] Optionally, the at least one detection device includes a first diode disposed on the first detection trace or a second diode disposed on the second detection trace.

[0015] Optionally, the orthographic projection of the first substrate overlaps with the orthographic projection of the second substrate.

[0016] Optionally, the orthographic projection of the second detection trace on the first substrate does not overlap with the orthographic projection of the first detection trace on the first substrate.

[0017] Optionally, an adhesive layer is provided between the display structure and the touch module.

[0018] Based on the same inventive concept, this application also provides a crack detection method for a display panel, the method being used in the display panel described in the above section, the method comprising:

[0019] loading a detection signal between the first test terminal and the second test terminal;

[0020] measuring a resistance value between the first test terminal and the second test terminal;

[0021] determining whether a crack is generated on the display structure and / or the touch structure according to the resistance value.

[0022] Based on the same inventive concept, the present application further provides a crack detection method of a display panel, the method being used in the display panel described in the foregoing parts, and the method comprising:

[0023] loading a first voltage between the first test terminal and the second test terminal to make the first diode or the second diode cut off, and obtaining a first resistance value between the first test terminal and the second test terminal;

[0024] loading a second voltage between the first test terminal and the second test terminal to make the first diode or the second diode conduct, and obtaining a second resistance value between the first test terminal and the second test terminal;

[0025] obtaining a third resistance value according to the first resistance value and the second resistance value;

[0026] determining whether a crack is generated on the display structure and / or the touch structure according to the first resistance value and the third resistance value.

[0027] Optionally, the determining whether a crack is generated on the display structure and / or the touch structure according to the first resistance value and the third resistance value comprises:

[0028] determining that a crack is generated on one of the display structure and the touch structure in response to the first resistance value being greater than a preset resistance value range;

[0029] determining that a crack is generated on the other of the display structure and the touch structure in response to the third resistance being greater than the preset resistance value range;

[0030] determining that cracks are generated on both the display structure and the touch structure in response to the first resistance value and the third resistance being greater than the preset resistance value range.

[0031] Based on the same inventive concept, the present application further provides a display device comprising the display panel described in any one of the foregoing parts.

[0032] It can be seen from the above that the display panel and the crack detection method thereof and the display device provided by the application, the display panel comprises a display structure, a touch structure and a detection unit, the display structure comprises a first substrate, a test end and a first detection trace, the test end is located in a binding area, and the first detection trace surrounds a display area and is located in a non-display area and is connected with the test end; the touch structure is arranged on the light-out side of the display structure and comprises a second substrate and a second detection trace arranged on the second substrate, the second detection trace surrounds the display area and is located in the non-display area and is connected with the test end so that the first detection trace and the second detection trace are connected in parallel, and at least one detection device is arranged on the first detection trace and / or the second detection trace; the detection unit is arranged on the first substrate and is electrically coupled with the test end, and is configured to detect the electrical parameters of the first detection trace and the second detection trace through the test end to determine whether cracks are generated on the display structure and / or the touch structure. By arranging at least one detection device on the first detection trace and the second detection trace, the electrical parameters of the first detection trace and the second detection trace are different, the detection unit detects the different electrical parameters of the first detection trace and the second detection trace, and thus whether cracks are generated on the display structure and / or the touch structure can be determined according to the different electrical parameters, so that the display position of the cracks can be accurately determined, and the detection effect of the display panel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the application or related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort.

[0034] Figure 1 A first exemplary display panel of the application is shown,

[0035] Figure 2 A second exemplary display panel of the application is shown.

[0036] Figure 3 A third exemplary display panel of the application is shown.

[0037] Figure 4 A fourth exemplary display panel of the application is shown.

[0038] Figure 5 A cross-sectional structure schematic diagram of the display panel of the embodiment of the application is shown.

[0039] Figure 6 A top view structure schematic diagram of the display panel of the embodiment of the application is shown.

[0040] Figure 7 A top view structural schematic diagram of a display panel of another embodiment of the present application is shown.

[0041] Figure 8 A top view structural schematic diagram of a display panel of another embodiment of the present application is shown.

[0042] Figure 9 A flow chart of a crack detection method of a display panel of an embodiment of the present application is shown.

[0043] Figure 10 A flow chart of a crack detection method of a display panel of an embodiment of the present application is shown.

[0044] Figure 11 A schematic diagram of an electronic device hardware structure provided by the present embodiment is shown.

[0045] In the drawings:

[0046] AA, display area; B, non-display area; C, binding area; PCD1, first detection trace; PCD2, second detection trace; PCD21, connecting part; 1, display structure; 2, touch structure; 3, adhesive layer; D1, first diode; D2, second diode; R1, first resistance; R2, second resistance. DETAILED DESCRIPTION

[0047] To make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application with reference to specific embodiments and the accompanying drawings.

[0048] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those with ordinary skills in the art to which the present application belongs. The terms “first”, “second” and similar terms used in the embodiments of the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms “include” or “contain” and similar terms mean that the components or objects before the terms cover the components or objects listed after the terms and their equivalents, without excluding other components or objects. The terms “connect” or “connected” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper”, “lower”, “left”, “right” and the like only represent relative positional relationships, which can change accordingly when the absolute positions of the described objects change.

[0049] Figure 1 A schematic diagram of an example display panel is shown.

[0050] As Figure 1As shown, the display panel P can include a display region AA and a non-display region B arranged around the display region AA, and the non-display region B further includes a binding region B1 arranged at least one side of the display region AA. As shown Figure 1 As shown, the display panel can include a display structure, and a detection unit can be arranged for panel crack detection. In some embodiments, the detection unit can be implemented as a display driving chip (DIC), which can be used to provide display signals for the display panel and signals for panel crack detection. Alternatively, as shown Figure 1 As shown, the display panel includes a detection trace PCD arranged around the display region AA and in the non-display region B, and the detection unit is arranged in the binding region B1. The detection end of the detection trace PCD is connected to the detection unit, and the detection unit detects the resistance value of the detection trace, which is generally between 100-500K. If the panel cracks, it will further cause the detection trace PCD to break, thereby causing the resistance value of the detection trace PCD to be too large. Through feedback by reading the register, it can be determined whether the display panel has cracks based on the resistance value. However, this method can only detect cracks for a single panel. For an externally mounted touch display screen, since there are separate display panels and touch panels, this method cannot simultaneously detect cracks in the display panel and the touch panel.

[0051] Figure 2 A schematic diagram of another exemplary display panel is shown.

[0052] As shown Figure 2 As shown, the display panel P includes a display region AA and a non-display region B arranged around the display region AA, and the non-display region B is arranged in the binding region B1 at least one side of the display region AA. Referring to Figure 5 As shown, the display panel can further include a display structure 1 and a touch structure 2. The display structure 1 and the touch structure 2 can be independent panel structures and can be fixed by an adhesive layer 3.

[0053] Back to Figure 2 Further, the display structure 1 includes a first detection trace PCD1 arranged around the display region AA and in the non-display region B, and the touch structure 2 includes a second detection trace PCD2 arranged around the display region AA and in the non-display region B. It should be noted that Figure 2 The projection structure of the display panel is shown from a top view, so the first detection trace PCD1 and the second detection trace PCD2 appear to be arranged on the same substrate, but in fact they are arranged on the display structure 1 and the touch structure 2 respectively, and are located in the non-display region of the respective substrates.

[0054] AsFigure 2 As shown, the detection unit DIC is located in the bonding area B1. Optionally, the detection unit DIC can be located in the bonding area of ​​the display structure, allowing for manufacturing and assembly based on conventional processes. Figure 2 As shown, the detection terminals of the first detection trace PCD1 and the second detection trace PCD2 are both connected to the detection unit DIC. Since the first and second detection traces are used to detect cracks in the display structure 1 and the touch structure 2, respectively, the detection unit DIC needs to use two sets of detection terminals to detect the resistance values ​​of the first detection trace PCD1 and the second detection trace PCD2. Although the display driver chip (DIC) typically includes two sets of PCD detection terminals, in reality, only one set is used for crack detection by reading the resistance value through the detection unit, while the other set is used for visual inspection. For example, when a crack is detected in a trace, vertical bright lines will appear on the left and right sides of the screen. Therefore, since the display driver chip (DIC) only has one set of detection terminals for detecting PCD resistance, the aforementioned detection trace design cannot meet the design requirements of the DIC, resulting in the inability to simultaneously detect the first detection trace PCD1 and the second detection trace PCD2.

[0055] To solve the aforementioned technical problems that do not meet the design requirements Figure 3 A schematic diagram of yet another exemplary display panel is shown. (As shown) Figure 3 As shown, the display panel P includes a display area AA and a non-display area B surrounding the display area AA. The non-display area B is disposed in a binding area B1 on at least one side of the display area AA. Figure 2 Similarly, the display panel may further include a display structure 1, a touch structure 2, and a detection unit DIC. For example... Figure 3As shown, the display structure 1 includes a first detection trace PCD1, the first detection trace PCD1 is arranged around the display area AA and in the non-display area B, the touch structure 2 includes a second detection trace PCD2, the second detection trace PCD2 is arranged around the display area AA and in the non-display area B, the second detection trace PCD2 is connected with the first detection trace PCD1 in series by using the through-hole punching method, the detection unit is located in the binding area B1, the detection end of the first detection trace PCD1 is connected with the detection unit DIC, and the detection unit DIC can detect the series resistance value of the first detection trace PCD1 and the second detection trace PCD2. Although this detection method overcomes the disadvantage of needing two groups of detection ends, it can simultaneously detect whether the display structure 1 and the touch structure 2 have cracks, and any crack in any structure will increase the resistance value of the detection trace. However, this method can only determine that one of the structures has a crack or all of the structures have cracks, and cannot determine the specific position of the crack, that is, it cannot determine whether the display structure 1 has a crack or the touch structure 2 has a crack. Since there are great differences in design, manufacturing factory, manufacturing process and the like between the two structures, when troubleshooting, it is still strongly desired to determine which structure has a problem to facilitate corresponding solution.

[0056] Figure 4 An exemplary display panel according to an embodiment of the present application is shown. In order to solve the above technical problems, as shown in Figure 4 , the display panel P includes a display area AA and a non-display area B arranged around the display area AA, and the non-display area B is arranged in the binding area C on at least one side of the display area AA. Referring to Figure 5 , the display panel P can further include a display structure 1, a touch structure 2 and a detection unit DIC, the display structure 1 includes a first detection trace PCD1, the first detection trace PCD1 is arranged around the display area AA and in the non-display area B, the touch structure 2 includes a second detection trace PCD2, the second detection trace PCD2 is arranged around the display area AA and in the non-display area B, the second detection trace PCD2 is connected with the first detection trace PCD1 in parallel by using the through-hole punching method, the detection unit DIC is located in the binding area B1, the detection end of the first detection trace PCD1 is connected with the detection unit DIC, the detection unit DIC can detect the resistance value of the detection trace, and the detection unit can detect the parallel resistance value of the first detection trace PCD1 and the second detection trace PCD2. For example, the resistance value of the first detection trace PCD1 of the display structure 1 is set as R PCD1 , the resistance value of the touch structure 2 is set as R PCD2 , and then the parallel resistance value of the first detection trace PCD1 and the second detection trace PCD2 conforms to the parallel formula of resistance: R PCD1 *R PCD2 ) / (R PCD1 +R PCD2) ; the first detection wire PCD1 of the display structure 1 is generally arranged on a metal layer, and the second detection wire PCD2 of the touch structure 2 is arranged on a metal layer or ITO (indium tin oxide, which has a transparent feature and a larger resistance than metal). If the display structure 1 and the touch structure 2 both use a metal layer wire as a detection wire, and the wire width is substantially the same, the resistance is substantially equivalent (the display area AA of the display structure 1 and the touch structure 2 is substantially the same). Therefore, R PCD1 ≈R PCD2 , according to Rtotal = (R PCD1 *R PCD2 ) / (R PCD1 +R PCD2 ), it can be known that Rtotal ≈ (R PCD1 ÷2) ≈ (R PCD2 ÷2). At this time, if PCD1 or PCD2 appears a microcrack, the impedance becomes larger or tends to infinity, Rtotal ≈ R PCD1 ≈R PCD2 At this time, it can be judged that one of the structures appears a crack, rather than both structures appearing a crack.

[0057] However, this method cannot determine which structure of the display structure 1 and the touch structure 2 appears a crack.

[0058] Figure 5 A cross-sectional structure schematic diagram of a display panel is shown. Figure 6 A top view structure schematic diagram of a display panel is shown.

[0059] In order to determine the specific position of the crack, as shown in Figure 5 and Figure 6 , the present application provides a display panel, the display panel P includes a display area AA and a non-display area B surrounding the display area AA, the non-display area B includes a binding area B1 arranged on at least one side of the display area AA, and the display panel includes:

[0060] A display structure 1 includes a first substrate, a test end arranged on the first substrate, and a first detection wire PCD1, the test end is located in the binding area B1, and the first detection wire surrounds the display area AA and is located in the non-display area BAA and connected with the test end;

[0061] The touch structure 2 is disposed on the light-emitting side of the display structure 1, including a second substrate and a second detection line PCD2 disposed on the second substrate. The second detection line PCD2 surrounds the display area AA and is located in the non-display area B and is connected to the test end so that the first detection line PCD1 and the second detection line PCD2 are connected in parallel. At least one detection device is disposed on the first detection line PCD1 and / or the second detection line PCD2.

[0062] The detection unit DIC, disposed on the first substrate and electrically coupled to the test terminal, is configured to detect the electrical parameters of the first detection trace and the second detection trace through the test terminal to determine whether cracks have occurred on the display structure 1 and / or the touch structure 2.

[0063] For example, display structure 1 can be an Organic Light Emitting Diode (OLED) display panel, and touch structure 2 is a touch panel externally attached to the display panel. In this embodiment, an adhesive layer 3 is provided between display structure 1 and the touch module. That is, the OLED display panel and the touch panel are bonded together with adhesive. The detection unit is a display driver chip (DIC) with a bonding area B1. The integrated circuit located in the display area AA and the traces located in the non-display area B are all bonded to the display driver chip DIC. Therefore, the first detection trace PCD1 and / or the second detection trace PCD2 are connected to the display driver chip DIC. The display driver chip DIC detects that at least one detection device is set on the first detection trace PCD1 and the second detection trace PCD2, so that the electrical parameters of the first detection trace PCD1 and the second detection trace PCD2 are different. The detection unit detects the different electrical parameters of the first detection trace PCD1 and the second detection trace PCD2, and thus determines whether cracks have occurred on the display structure 1 and / or the touch structure 2 based on the different electrical parameters. This enables the determination of the specific location of the crack and improves the detection effect of the display panel.

[0064] like Figure 6 As shown, the detection unit includes a first pin and a second pin for detecting the electrical parameters. The test terminal includes a first test terminal and a second test terminal. The first pin is electrically coupled to the first test terminal, and the second pin is electrically coupled to the second test terminal. The electrical parameters of the first detection trace and the second detection trace include the resistance value or conductivity measured between the first test terminal and the second test terminal.

[0065] For example, such as Figure 6As shown, the first test end can be a test end on the left side of the first detection trace connected with the detection unit, and the second test end can be a test end on the right side of the first detection trace connected with the detection unit. The first pin of the detection unit can be a terminal connected with the first test end, and the second pin can be a terminal connected with the second test end. Since the first detection trace and the second detection trace are connected in parallel, the detection unit is connected with the first test end through the first pin and connected with the second test end through the second pin, and the resistance value or the conductivity between the first test end and the second test end of the first detection trace is measured through the first pin and the second pin. Thus, the parallel resistance value or the conductivity of the first detection trace and the second detection trace is measured, and the position of the crack can be determined by calculating the resistance value or the conductivity of each monitoring trace.

[0066] In the embodiment, as shown in Figure 6 , the at least one detection device includes a first resistance R1 arranged on the first detection trace and / or a second resistance R2 arranged on the second detection trace.

[0067] For example, the detection device includes a first resistance R1 arranged on the first detection trace PCD1 and a second resistance R2 arranged on the second detection trace PCD2. The resistance value of the first detection trace PCD1 arranged with the first resistance R1 is different from the resistance value of the second detection trace PCD2 arranged with the second resistance R2. For example, the resistance value of the first detection trace arranged with the first resistance is more than 2 times of the resistance value of the second detection trace arranged with the second resistance. It can be understood that since the first detection trace PCD1 and the second detection trace PCD2 are usually wires, the resistance values thereof are much lower than the first resistance R1 and the second resistance R2, and thus, the resistance value relationship can be optionally equivalent to that the resistance value of the first resistance R1 is more than 2 times of the resistance value of the second resistance R2, so that the same effect can be achieved by selecting the first resistance R1 and the second resistance R2 with specific resistance values, and the design time is saved and the efficiency is improved.

[0068] For example, when the resistance value of the second detection trace PCD2 arranged with the second resistance R2 is more than 2 times of the resistance value of the first detection trace arranged with the first resistance, i.e., R PCD2 = 2R PCD1 , if neither the display structure 1 nor the touch structure 2 has a crack open circuit, then: Rtotal = (R PCD1 * R PCD2 ) / (R PCD1 + R PCD2 ) = (R PCD1 * 2R PCD1 ) / (R PCD1 + 2R PCD1 ) = 2 / 3R PCD1If the display structure 1 has a crack open circuit, the detection unit detects that the parallel resistance of the first detection trace and the second detection trace is Rtotal≈R PCD2 =2R PCD1 If the touch structure 2 has a crack open circuit, Rtotal≈R PCD1 If the display structure 1 and the touch structure 2 both have a crack open circuit, the impedance Rtotal is larger, or the area is infinite. Therefore, by the resistance values 2 / 3R PCD1 , 2R PCD1 , R PCD1 and Rtotal infinite, it can be judged which structure has a crack open circuit.

[0069] As shown in Figure 6 , the orthographic projection of the first substrate overlaps the orthographic projection of the second substrate.

[0070] Illustratively, the first substrate and the second substrate are the same size, and the first substrate and the second substrate are stacked, so that the appearance of the display panel is more beautiful.

[0071] Further, the orthographic projection of the second detection trace on the first substrate does not overlap the orthographic projection of the first detection trace on the first substrate.

[0072] Illustratively, the orthographic projection of the first detection trace and the second detection trace on the substrate does not overlap, so that the signal influence between the signal traces can be reduced, and stable transmission of signals of the signal traces is ensured.

[0073] Figure 7 A top view structural schematic diagram of a display panel of another embodiment of the present application is shown.

[0074] As shown in Figure 7 , the present application provides a display panel P, which includes a display area AA and a non-display area B surrounding the display area AA, the non-display area B includes a binding area B1 arranged on at least one side of the display area AA, and the display panel includes:

[0075] The display structure 1 includes a first substrate, a test terminal arranged on the first substrate, and a first detection trace, the test terminal is located in the binding area B1, the first detection trace surrounds the display area AA and is located in the non-display area B and is connected with the test terminal;

[0076] The touch structure 2 is arranged on the light-emitting side of the display structure 1 and includes a second substrate and a second detection trace arranged on the second substrate, the second detection trace surrounds the display area AA and is located in the non-display area B and is connected with the test terminal to make the first detection trace and the second detection trace in parallel, and at least one detection device is arranged on the first detection trace and / or the second detection trace.

[0077] The detection unit is arranged on the first substrate and is electrically coupled with the test terminal and is configured to detect the electrical parameter of the first detection trace and the second detection trace through the test terminal to determine whether a crack is generated on the display structure 1 and / or the touch structure 2.

[0078] For example, the display structure 1 can be an organic light emitting diode (OLED) display panel, and the touch structure 2 can be a touch panel arranged on the display structure 1. In the embodiment, the display structure 1 and the touch structure 2 are arranged with an adhesive layer 3. That is, the display structure 1 and the touch structure 2 are pasted together by the adhesive. The detection unit is a driving chip IC arranged in the binding area B1. The integrated circuit located in the display area AA and each trace located in the non-display area B are bound on the display driving chip DIC, so that the first detection trace and / or the second detection trace are connected with the display driving chip DIC, and at least one detection device arranged on the first detection trace and the second detection trace is detected through the display driving chip DIC, so that the electrical parameters of the first detection trace and the second detection trace are different, and the detection unit detects the different electrical parameters of the first detection trace and the second detection trace, so that whether a crack is generated on the display structure 1 and / or the touch structure 2 can be determined according to the different electrical parameters, so that the display position of the crack can be accurately determined, and the detection effect of the display panel is improved.

[0079] As shown in FIG. 1, the display structure 1 includes a first substrate 10 and a display area AA arranged on the first substrate 10, and the touch structure 2 includes a second substrate 20 and a non-display area B arranged on the second substrate 20. Figure 7 The detection unit includes a first pin and a second pin for detecting the electrical parameter, the test terminal includes a first test terminal and a second test terminal, the first pin is electrically coupled with the first test terminal, and the second pin is electrically coupled with the second test terminal, and the electrical parameter of the first detection trace and the second detection trace includes the resistance value or the conductivity measured between the first test terminal and the second test terminal.

[0080] For example, as shown in FIG. 2, the display structure 1 includes a first substrate 10 and a display area AA arranged on the first substrate 10, and the touch structure 2 includes a second substrate 20 and a non-display area B arranged on the second substrate 20. Figure 7As shown, the first test end can be a test end on the left side of the first detection trace connected with the detection unit, and the second test end can be a test end on the right side of the first detection trace connected with the detection unit. The first pin of the detection unit can be a terminal connected with the first test end, and the second pin can be a terminal connected with the second test end. Since the first detection trace and the second detection trace are in parallel, the detection unit is connected with the first test end through the first pin and connected with the second test end through the second pin, and the resistance value or the conductivity between the first test end and the second test end of the first detection trace is measured through the first pin and the second pin. Thus, the parallel resistance value or the conductivity of the first detection trace and the second detection trace is measured, and the position of the crack can be determined by calculating the resistance value or the conductivity of each monitoring trace.

[0081] In the embodiment, as shown in Figure 7 , the at least one detection device includes a first diode D1 arranged on the first detection trace.

[0082] For example, the detection device includes a first diode D1 arranged on the first detection trace. The detection is performed by loading an off voltage (for example, a voltage making the first diode D1 in an off state) between the first test end and the second test end.

[0083] Optionally, the first diode D1 can be a Zener diode, and the off voltage loaded between the first test end and the second test end can be a low voltage making the Zener diode in a reverse bias state. At this time, since the first diode D1 is not reversed and turned on, the first detection trace PCD1 is equivalent to an open circuit, i.e., the resistance is infinite, and thus the resistance value read by the detection unit can be equivalent to the resistance value R PCD2 of the second detection trace.

[0084] Then, the detection is performed by loading an on voltage (for example, a voltage making the first diode D1 in an on state) between the first test end and the second test end.

[0085] Optionally, when the first diode D1 is a Zener diode, the on voltage loaded between the first test end and the second test end can be a high voltage making the Zener diode in a reverse breakdown state. At this time, the first diode D1 is turned on, and since the first detection trace and the second detection trace are in parallel, the parallel resistance R 总 of the first detection trace and the second detection trace is obtained. At this time, the resistance R PCD2 of the second detection trace and the resistance value of the parallel resistance are known, and the resistance R 总 of the first detection trace can be solved according to the formula R PCD1 = (R PCD2 *R PCD1 ) / (R PCD2 +R PCD1According to the resistance R PCD1 of the first detection trace and the resistance R PCD2 of the second detection trace, it can be accurately determined whether the display structure 1 or the touch structure 2 has a crack.

[0086] As shown in FIG. 1, the orthographic projection of the first substrate overlaps the orthographic projection of the second substrate. Figure 7

[0087] For example, the first substrate and the second substrate have the same size, and the first substrate and the second substrate are arranged in a superimposed manner, so that the appearance of the display panel is more beautiful.

[0088] Further, the orthographic projection of the second detection trace on the first substrate does not overlap the orthographic projection of the first detection trace on the first substrate.

[0089] For example, the orthographic projection of the first detection trace and the second detection trace on the substrate does not overlap, so that the signal impression between the signal traces can be reduced, and the stable transmission of the signal of each signal trace can be ensured.

[0090] Figure 8 FIG. 1 shows a top view of a display panel according to another embodiment of the present application.

[0091] As shown in FIG. 1, the orthographic projection of the first substrate overlaps the orthographic projection of the second substrate. Figure 8

[0092] For example, the detection device includes a second diode D2 arranged on the second detection trace PCD2. Detection is performed by loading an off voltage (for example, a voltage that causes the second diode D2 to be in an off state) between the first test terminal and the second test terminal.

[0093] Optionally, the second diode D2 can be a Zener diode, and the off voltage loaded between the first test terminal and the second test terminal can be a low voltage that causes the Zener diode to be in a reverse bias state. At this time, since the second diode D2 is not reversed and turned on, the second detection trace PCD2 is equivalent to an open circuit, that is, the resistance is infinite, and therefore, the resistance value read by the detection unit is equivalent to the resistance R PCD1 of the first detection trace PCD1.

[0094] Then, detection is performed by loading a turn-on voltage (for example, a voltage that causes the second diode D2 to be in a turn-on state) between the first test terminal and the second test terminal.

[0095] ​​Optionally, when the second diode D2 is a Zener diode, the on voltage loaded between the first test terminal and the second test terminal can be a high voltage which makes the Zener diode in a reverse breakdown state, at this time, the second diode D2 is on, and since the first detection trace and the second detection trace are in parallel, the parallel resistance R of the first detection trace and the second detection trace is obtained 总 At this time, the resistance R of the first detection trace is known PCD1 and the parallel resistance Rtotal, according to the formula R 总 =(R PCD1 *R PCD2 ) / R PCD1 +R PCD2 ), the resistance R of the second detection trace can be solved PCD2 According to the resistance R of the first detection trace PCD1 and the resistance R of the second detection trace PCD2 , it can be accurately judged whether the display structure 1 or the touch structure 2 has a crack.

[0096] Figure 9 A flow chart of a crack detection method of a display panel is shown.

[0097] As shown in Figure 9 , based on the same inventive concept, the present application also provides a crack detection method of a display panel, the method is used for the display panel described in the above part, and the method comprises the following steps:

[0098] Step 102, loading a detection signal between the first test terminal and the second test terminal;

[0099] Step 104, measuring the resistance value between the first test terminal and the second test terminal;

[0100] Step 106, determining whether a crack is generated on the display structure and / or the touch structure according to the resistance value.

[0101] For example, when the resistance of the second detection trace provided with the second resistance is more than twice the resistance of the first detection trace provided with the first resistance, that is, R PCD2 =2R PCD1 , if neither the display structure nor the touch structure has a crack open circuit, then: R 总 =(R PCD1 *R PCD2 ) / (R PCD1 +R PCD2 ) = (R PCD1 *2R PCD1 ) / (R PCD1 +2R PCD1 )=2 / 3R PCD1; if the display structure has a crack, the detection unit detects that the parallel resistance of the first detection trace and the second detection trace is R 总 ≈R PCD2 = 2R PCD1 . If the touch structure has a crack, R 总 ≈R PCD1 . If both the display structure and the touch structure have cracks, the total impedance Rtotal is large, or the area is infinite. Therefore, by the resistance values 2 / 3R PCD1 , 2R PCD1 , R PCD1 and R 总 , it can be determined which structure has a crack.

[0102] Figure 10 A flowchart of a crack detection method of a display panel is shown.

[0103] As shown in Figure 10 , based on the same inventive concept, the present application also provides a crack detection method of a display panel, which is used for the display panel described in the foregoing parts, and comprises the following steps:

[0104] Step 202: loading a first voltage between the first test terminal and the second test terminal to make the first diode or the second diode cut off, and obtaining a first resistance value between the first test terminal and the second test terminal;

[0105] Step 204: loading a second voltage between the first test terminal and the second test terminal to make the first diode or the second diode conduct, and obtaining a second resistance value between the first test terminal and the second test terminal;

[0106] Step 206: obtaining a third resistance value according to the first resistance value and the second resistance value;

[0107] Step 208: determining whether a crack is generated on the display structure and / or the touch structure according to the first resistance value and the third resistance value.

[0108] For example, based on the structure of the display panel described above, the detection device comprises a first diode D1 arranged on the first detection trace. By loading a low voltage between the first test terminal and the second test terminal for detection, since the voltage is low, the first diode D1 is not conductive, and the detection unit can read the first resistance value (i.e. the resistance value R PCD2Then, a high voltage is applied between the first and second test terminals for detection. Due to the high voltage, the first diode D1 conducts. Since the first and second detection traces are connected in parallel, the second resistance value (parallel resistance Rtotal) of the first and second detection traces is obtained. At this point, the first resistance value (i.e., the resistance value Rtotal of the second detection trace) is known. PCD2 ) and the second resistance value (the resistance value R of the parallel resistor) 总 According to formula R 总 =(R PCD1 *R PCD2 ) / (R PCD1 +R PCD2 The resistance value R of the first detection trace can be solved. PCD1 (That is, the third resistance value). Based on the first and third resistance values, it can be accurately determined whether the crack is in the display structure 1 or the touch structure 2.

[0109] Further, in this embodiment, determining whether a crack has occurred on the display structure and / or the touch structure based on the first resistance value and the third resistance value includes:

[0110] In response to the first resistance value being greater than a preset resistance value range, it is determined that a crack has been generated on the touch structure;

[0111] In response to the third resistor being greater than a preset resistance range, it is determined that a crack has occurred in the display structure;

[0112] In response to the fact that both the first resistance value and the third resistance value are greater than a preset resistance value range, it is determined that cracks have been generated in both the display structure and the touch structure.

[0113] For example, the preset resistance range is 100K-600K. When the first resistance value is greater than the preset range, it indicates that the resistance of the second detection trace is too high, and a crack has appeared in the touch structure 2. When the second resistance value is greater than the preset range, it indicates that the resistance of the first detection trace is too high, and a crack has appeared in the display structure 1. When both the first and third resistance values ​​are greater than the preset range, it indicates that cracks have appeared in both structures. Therefore, it is determined that cracks have appeared in both the display structure 1 and the touch structure 2. By using the resistance value judgment method, the specific location of the crack can be accurately determined, which facilitates subsequent repair of the display panel.

[0114] Alternatively, the detection device includes a second diode D2 disposed on the second detection trace PCD2. Detection is performed by applying a low voltage between the first and second test terminals. Due to the low voltage, the second diode D2 is not conducting, and the detection unit can read the resistance value R of the first detection trace. PCD1(first resistance value); and then detecting by loading a high voltage between the first test terminal and the second test terminal, since the high voltage is high, the second diode D2 is turned on, since the first detection line and the second detection line are in parallel, thereby obtaining the parallel resistance Rtotal (second resistance value) of the first detection line and the second detection line. At this time, the resistance value R PCD1 of the first detection line is known, and the resistance value R PCD1 of the second detection line can be solved according to the formula Rtotal = (R PCD2 + R PCD1 ) / (R PCD2 + R PCD2 ), and the resistance value R PCD1 (third resistance value) of the first detection line and the resistance value R PCD2 (first resistance value) of the second detection line are known, it can be accurately determined whether the display structure 1 or the touch structure 2 has a crack.

[0115] In the embodiment, the determining whether the crack is generated on the display structure and / or the touch structure according to the first resistance value and the third resistance value comprises:

[0116] determining that the crack is generated on the display structure in response to the first resistance value being greater than a preset resistance value range;

[0117] determining that the crack is generated on the touch structure in response to the third resistance being greater than the preset resistance value range;

[0118] determining that the cracks are generated on the display structure and the touch structure in response to the first resistance value and the third resistance value both being greater than the preset resistance value range.

[0119] For example, the preset resistance value range is 100K-600K. When the first resistance value is greater than the preset resistance value range, it indicates that the resistance value of the first detection line is too high, and the display structure 1 has a crack. When the second resistance value is greater than the preset resistance value range, it indicates that the resistance value of the second detection line is too high, and the touch structure 2 has a crack. When the first resistance value and the third resistance value are both greater than the preset resistance value range, it indicates that the two structures have cracks, and therefore, it is determined that the cracks are generated on the display structure 1 and the touch structure 2. The resistance value determination method can accurately determine the specific position of the crack, so as to facilitate subsequent maintenance of the display panel.

[0120] Based on the same inventive concept, the application further provides a display device comprising the display panel of any one of the above.

[0121] The display device can be an LED display, an OLED display, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or any product or component having a display function, and the embodiments of the present disclosure are not limited thereto.

[0122] It should be noted that the method of the embodiments of the present application can be executed by a single device, such as a computer or a server, etc. The method of the embodiments can also be applied to a distributed scenario, and be completed by multiple devices cooperating with each other. In the distributed scenario, one of the multiple devices can only execute one or more steps in the method of the embodiments of the present application, and the multiple devices can interact with each other to complete the method.

[0123] It should be noted that some embodiments of the present application have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order and still achieve desirable results. Additionally, the process depicted in the figures does not necessarily require the particular order shown, or sequential order to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0124] Based on the same inventive concept, the present application also provides an electronic device corresponding to the method of any of the above embodiments, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the crack detection method of the display panel according to any of the embodiments.

[0125] Figure 11 A more specific hardware structure of an electronic device provided by the embodiments is shown, which can include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040 and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030 and the communication interface 1040 are connected to each other through the bus 1050 for communication within the device.

[0126] The processor 1010 can be implemented in the form of a general-purpose CPU (Central Processing Unit, central processor), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits, etc., for executing related programs to implement the technical solutions provided by the embodiments of the present application.

[0127] The memory 1020 can be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, etc. The memory 1020 can store an operating system and other application programs, and when the technical solutions provided in the embodiments of the present specification are implemented by software or firmware, the related program codes are stored in the memory 1020 and are called and executed by the processor 1010.

[0128] The input / output interface 1030 is configured to connect an input / output module to realize information input and output. The input / output module can be configured as a component in the device (not shown in the figure) or can be externally connected to the device to provide corresponding functions. The input device can include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device can include a display, a speaker, a vibrator, an indicator light, etc.

[0129] The communication interface 1040 is configured to connect a communication module (not shown in the figure) to realize the communication interaction between the device and other devices. The communication module can realize communication through a wired manner (such as USB, network cable, etc.) or through a wireless manner (such as mobile network, WIFI, Bluetooth, etc.).

[0130] The bus 1050 includes a channel for transmitting information between various components (such as the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040) of the device.

[0131] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in the specific implementation process, the device can also include other components necessary for normal operation. In addition, those skilled in the art can understand that the above device can also only contain the components necessary to implement the embodiments of the present specification, and does not have to contain all the components shown in the figure.

[0132] The electronic device of the above embodiments is used to implement the crack detection method of the display panel in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described here.

[0133] Based on the same inventive concept, corresponding to any of the above method embodiments, the present application also provides a non-transitory computer readable storage medium storing computer instructions for causing the computer to execute the crack detection method of the display panel according to any of the above embodiments.

[0134] The computer readable media of the embodiments can include permanent and non-permanent, removable and non-removable media, which can be implemented by any method or technology to store information. The information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device, or any other non-transmission medium that can be used to store information accessible to a computing device.

[0135] The storage medium of the above embodiments stores computer instructions for causing the computer to execute the crack detection method of the display panel as described in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which are not described here.

[0136] Those skilled in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope (including claims) of the present application is limited to these examples; the above embodiments or technical features between different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of the different aspects of the embodiments of the present application as described above. In order to be brief, they are not provided in detail.

[0137] In addition, in order to simplify the description and discussion, and so as not to make the embodiments of the present application difficult to understand, the well-known power / ground connections of integrated circuit (IC) chips and other components can or can not be shown in the provided drawings. In addition, the devices can be shown in the form of block diagrams in order to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented the embodiments of the present application (i.e. these details should be fully within the understanding of those skilled in the art). Where specific details (e.g. circuits) are set forth in order to describe the exemplary embodiments of the present application, it will be apparent to those skilled in the art that the embodiments of the present application can be implemented without these specific details or with variations of these specific details. Therefore, these descriptions should be considered illustrative rather than limiting.

[0138] While the present application has been described in connection with certain embodiments thereof, many modifications, substitutions, changes, and of forms will be apparent to those of ordinary skill in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) can use the embodiments discussed.

[0139] Embodiments of the present application are intended to cover all such alternatives, modifications, and variations as come within the scope of the appended claims. Accordingly, any and all such alterations, omissions, equivalents, improvements, and the like are intended to be encompassed by the present application.

Claims

1. A display panel, characterized in that, The display panel includes a display area and a non-display area surrounding the display area, the non-display area including a binding area disposed on at least one side of the display area, and the display panel includes: The display structure includes a first substrate, a test terminal disposed on the first substrate, and a first detection trace. The test terminal is located in the bonding area, and the first detection trace surrounds the display area and is located in the non-display area and is connected to the test terminal. A touch structure is disposed on the light-emitting side of the display structure, including a second substrate and a second detection trace disposed on the second substrate. The second detection trace surrounds the display area and is located in the non-display area and is connected to the test end so that the first detection trace and the second detection trace are connected in parallel. At least one detection device is disposed on the first detection trace and / or the second detection trace. A detection unit, disposed on the first substrate and electrically coupled to the test terminal, is configured to detect the electrical parameters of the first detection trace and the second detection trace through the test terminal to determine whether cracks have occurred on the display structure and / or the touch structure; wherein the electrical parameters of the first detection trace and the second detection trace are different.

2. The display panel according to claim 1, characterized in that, The detection unit includes a first pin and a second pin for detecting the electrical parameters. The test terminal includes a first test terminal and a second test terminal. The first pin is electrically coupled to the first test terminal, and the second pin is electrically coupled to the second test terminal. The electrical parameters of the first detection trace and the second detection trace include the resistance value or conductivity measured between the first test terminal and the second test terminal.

3. The display panel according to claim 2, characterized in that, The at least one detection device includes a first resistor disposed on the first detection trace and / or a second resistor disposed on the second detection trace.

4. The display panel according to claim 3, characterized in that, The resistance value of the first detection trace equipped with the first resistor is different from the resistance value of the second detection trace equipped with the second resistor.

5. The display panel according to claim 4, characterized in that, The resistance of the first detection trace equipped with the first resistor is more than twice the resistance of the second detection trace equipped with the second resistor.

6. The display panel according to claim 2, characterized in that, The at least one detection device includes a first diode disposed on the first detection trace or a second diode disposed on the second detection trace.

7. The display panel according to claim 1, characterized in that, The orthographic projection of the first substrate overlaps with the orthographic projection of the second substrate.

8. The display panel according to claim 7, characterized in that, The orthographic projection of the second detection trace on the first substrate does not overlap with the orthographic projection of the first detection trace on the first substrate.

9. The display panel according to claim 1, characterized in that, An adhesive layer is provided between the display structure and the touch structure.

10. A method for detecting cracks in a display panel, characterized in that, The method is used in the display panel according to any one of claims 2 to 5, the method comprising: A detection signal is applied between the first test terminal and the second test terminal; The resistance value between the first test terminal and the second test terminal was measured. Based on the resistance value, determine whether cracks have occurred on the display structure and / or the touch structure.

11. A method for detecting cracks in a display panel, characterized in that, The method is used in the display panel of claim 6, the method comprising: A first voltage is applied between the first test terminal and the second test terminal to turn off the first diode or the second diode, and a first resistance value is obtained between the first test terminal and the second test terminal. A second voltage is applied between the first test terminal and the second test terminal to turn on the first diode or the second diode, and a second resistance value is obtained between the first test terminal and the second test terminal; Based on the first resistance value and the second resistance value, the third resistance value is obtained; Based on the first resistance value and the third resistance value, determine whether cracks have occurred on the display structure and / or the touch structure.

12. The method according to claim 11, characterized in that, The step of determining whether a crack has occurred on the display structure and / or the touch structure based on the first resistance value and the third resistance value includes: In response to the first resistance value being greater than a preset resistance value range, it is determined that a crack has occurred in one of the display structure and the touch structure; In response to the third resistance value being greater than a preset resistance range, it is determined that a crack has occurred in another of the display structure and the touch structure. In response to the fact that both the first resistance value and the third resistance value are greater than a preset resistance value range, it is determined that cracks have been generated in both the display structure and the touch structure.

13. A display device, characterized in that, Includes the display panel described in any one of claims 1 to 9.

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