Display panel, crack detection method thereof and display device

Abstract

The invention provides a display panel and a crack detection method thereof and a display device.The display panel comprises a display structure, a touch control structure and a detection unit, the display structure comprises a first detection wire, the touch control structure comprises a second detection wire, and the first detection wire and the second detection wire are connected in parallel and connected to the detection unit; and the crack detector is configured to detect electrical parameters of the first detection wire and the second detection wire through the test end so as to determine whether cracks are generated on the display structure and / or the touch control structure. At least one detection device is arranged on a first detection wire and a second detection wire, so that electrical parameters of the first detection wire and the second detection wire are different, and a detection unit detects different electrical parameters of the first detection wire and the second detection wire. Therefore, whether cracks are generated on the display structure and / or the touch control structure or not can be determined according to different electrical parameters, the display positions of the cracks can be accurately judged, and the detection effect of the display panel is improved.

Description

Technical Field

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

[0002] With the rapid development of display technology, touch screen panels have gradually become common in people's lives. In related technologies, panel crack detection (PCD) is usually used to detect cracks in panels. Generally, metal traces used for detection are connected and arranged around the panel. When cracks appear on the panel, the resistance of the broken crack detection metal traces will increase. In this way, the purpose of detecting film layer cracks is achieved by detecting the resistance change of the crack detection metal traces.

[0003] In the related art, touch screens can be divided into add-on touch screens (Addon Mode Touch Panel) and embedded touch screens (In Cell Touch Panel) according to their composition structure. Among them, the add-on touch screen includes a touch panel and a display panel, which are produced separately from the display panel and then bonded together.

[0004] However, the inventors of the present disclosure have discovered that, for an external touch display screen, the crack detection method of the related art cannot accurately determine whether the crack exists in the touch panel or in the display panel. Summary of the invention

[0005] In view of this, the purpose of the present application is to propose a display panel and a crack detection method thereof, and a display device, so as to partially or completely solve the technical problems raised in the background technology.

[0006] Based on the above purpose, the present application provides a display panel, the display panel comprising a display area and a non-display area surrounding the display area, the non-display area comprising a binding area arranged on at least one side of the display area, the display panel comprising:

[0007] The display structure includes a first substrate, a test end and a first detection line arranged on the first substrate, wherein the test end is located in the binding area, and the first detection line surrounds the display area and is located in the non-display area and connected to the test end;

[0008] A touch structure, arranged at the light-emitting side of the display structure, comprising a second substrate and a second detection line arranged on the second substrate, wherein the second detection line surrounds the display area and is located in the non-display area and is connected to the test end so that the first detection line and the second detection line are connected in parallel, and at least one detection device is arranged on the first detection line and / or the second detection line;

[0009] A detection unit is disposed on the first substrate and electrically coupled to the test end, and is configured to detect electrical parameters of the first detection line and the second detection line through the test end to determine whether cracks occur 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, the test end includes a first test end and a second test end, the first pin is electrically coupled to the first test end, and the second pin is electrically coupled to the second test end; the electrical parameters of the first detection trace and the second detection trace include a resistance value or conductivity measured between the first test end and the second test end.

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

[0012] Optionally, a resistance value of the first detection line provided with the first resistor is different from a resistance value of the second detection line provided with the second resistor.

[0013] Optionally, a resistance value of the first detection line provided with the first resistor is more than twice a resistance value of the second detection line provided with the second resistor.

[0014] Optionally, the at least one detection device includes a first diode arranged on the first detection trace or a second diode arranged 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, an orthographic projection of the second detection line on the first substrate does not overlap with an orthographic projection of the first detection line 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, the present application also provides a method for detecting cracks in a display panel, the method being used for the display panel described in the above part, the method comprising:

[0019] Loading a detection signal between the first test end and the second test end;

[0020] Measuring the resistance value between the first test end and the second test end;

[0021] Whether cracks are generated on the display structure and / or the touch structure is determined according to the resistance value.

[0022] Based on the same inventive concept, the present application also provides a method for detecting cracks in a display panel, the method being used for the display panel described in the above part, the method comprising:

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

[0024] Applying a second voltage between the first test terminal and the second test terminal to turn on the first diode or the second diode, 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] Whether cracks are generated on the display structure and / or the touch structure is determined according to the first resistance value and the third resistance value.

[0027] Optionally, determining whether cracks occur on the display structure and / or the touch structure according to the first resistance value and the third resistance value includes:

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

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

[0030] Cracks occur on both the structure and the touch structure.

[0031] Based on the same inventive concept, the present application also provides a display device, comprising any of the display panels described above.

[0032] As can be seen from the above, the present application provides a display panel and a crack detection method and a display device thereof, wherein the display panel includes a display structure, a touch structure and a detection unit, wherein the display structure includes a first substrate, a test end and a first detection trace arranged on the first substrate, the test end is located in a binding area, the first detection trace surrounds the display area and is located in a non-display area and is connected to the test end; the touch structure is arranged on the light-emitting side of the display structure, includes 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 to 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 electrically coupled to the test end, and is configured to detect electrical parameters of the first detection trace and the second detection trace through the test end to determine whether cracks occur in the display structure and / or the touch structure. By setting at least one detection device on the first detection line and the second detection line, the electrical parameters of the first detection line and the second detection line are made different. The detection unit detects the different electrical parameters of the first detection line and the second detection line, so that it can be determined whether cracks are generated on the display structure and / or the touch structure according to the different electrical parameters, so as to accurately judge the display position of the crack and improve the detection effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 shows a first exemplary display panel of the present application,

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

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

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

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

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

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

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

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

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

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

[0045] In the attached figure:

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

[0047] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to 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 the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

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

[0050] like Figure 1As shown, the display panel P may include a display area AA and a non-display area B disposed around the display area AA, and the non-display area B further includes a binding area B1 disposed on at least one side of the display area AA. Figure 1 As shown, optionally, the display panel includes a display structure, and a detection unit may be provided, and the detection unit may be used to detect cracks in the panel. In some embodiments, the detection unit may be implemented as a display driver chip (DIC), which may be used to provide a display signal for the display panel and a signal for detecting cracks in the panel. Figure 1 As shown, the display panel includes a detection line PCD, which surrounds the display area AA and is located in the non-display area B. The detection unit is located in the binding area B1. The detection end of the detection line PCD is connected to the detection unit. The detection unit will detect the resistance of the detection line, which is generally between 100-500K. If the panel has cracks, it will further cause the detection line PCD to break, and then cause the resistance of the detection line PCD to be too large. By reading back the register for feedback, it can be judged based on the resistance value whether the display panel has cracks. However, this method can only detect cracks on a single panel. For an external touch display screen, due to the existence of a separate display panel and touch panel, this method cannot detect cracks in the display panel and the touch panel at the same time.

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

[0052] like Figure 2 As shown, 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 a binding area B1 at least on one side of the display area AA. Figure 5 As shown, the display panel may further include a display structure 1 and a touch structure 2. The display structure 1 and the touch structure 2 may be independent panel structures and may be fixed by an adhesive layer 3.

[0053] Back to Figure 2 Further, the display structure 1 includes a first detection line PCD1, the first detection line PCD1 surrounds the display area AA and is located in the non-display area B, and the touch structure 2 includes a second detection line PCD2, the second detection line PCD2 surrounds the display area AA and is located in the non-display area B. It should be noted that, Figure 2 The projection structure of the display panel is illustrated 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 are actually arranged on the display structure 1 and the touch structure 2 respectively, and are both located in the non-display area of ​​the respective substrates.

[0054] like Figure 2 As shown, the detection unit DIC is located in the binding area B1. Optionally, the detection unit DIC can be located in the binding area of ​​the display structure, so that it can be manufactured and assembled based on conventional processes. Figure 2 As shown, the detection end of the first detection line PCD1 and the detection end of the second detection line PCD2 are both connected to the detection unit DIC. Since the first detection line and the second detection line 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 ends to detect the resistance values ​​of the first detection line PCD1 and the second detection line PCD2, respectively. Although the display driver chip (DIC) usually includes two sets of PCD detection ends, in fact, only one set of detection ends is used to read the resistance value through the detection unit for crack detection, and the other set of detection ends is used for judgment through visual inspection. For example, when cracks appear in the detection line, vertical bright lines will appear on the left and right sides of the screen. It can be seen that since the display driver chip (DIC) is only designed with one set of detection ends for detecting PCD resistance, the design of the aforementioned detection line cannot meet the design requirements of DIC, resulting in the inability to simultaneously detect the first detection line PCD1 and the second detection line PCD2.

[0055] In order to solve the above technical problems that do not meet the design requirements, Figure 3 A schematic diagram of another exemplary display panel is shown. Figure 3 As shown, 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 a binding area B1 at least on one side of the display area AA. Figure 2 Similarly, the display panel may further include a display structure 1, a touch control structure 2 and a detection unit DIC. Figure 3As shown, the display structure 1 includes a first detection line PCD1, which surrounds the display area AA and is located in the non-display area B. The touch structure 2 includes a second detection line PCD2, which surrounds the display area AA and is located in the non-display area B. The second detection line PCD2 is connected in series with the first detection line PCD1 by a through-layer punching method. The detection unit is located in the binding area B1. The detection end of the first detection line PCD1 is connected to the detection unit DIC. The detection unit DIC will detect the series resistance of the first detection line PCD1 and the second detection line PCD2. Although this detection method overcomes the disadvantage of requiring two sets of detection ends, it can simultaneously measure whether the display structure 1 and the touch structure 2 have cracks. If any of the structures have cracks, the resistance of the detection line will increase. However, this method can only determine whether one of the structures has cracks or all of them have cracks, and cannot determine the specific location of the cracks, that is, it cannot determine whether the display structure 1 or the touch structure 2 has cracks. Since the two structures have significant differences in design, manufacturing plant, and manufacturing process, when troubleshooting the problem, there is still a strong desire to determine which structure has the problem so that a corresponding solution can be provided.

[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 Figure 4 As shown, 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 a binding area C on at least one side of the display area AA. Figure 5 The display panel P may 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 surrounds the display area AA and is located in the non-display area B. The touch structure 2 includes a second detection trace PCD2. The second detection trace PCD2 surrounds the display area AA and is located in the non-display area B. The second detection trace PCD2 is connected in parallel with the first detection trace PCD1 by a through-layer punching method. The detection unit DIC is located in the binding area B1. The detection end of the first detection trace PCD1 is connected to the detection unit DIC. The detection unit DIC will detect the resistance of the detection trace, and the detection unit will detect the parallel resistance of the first detection trace PCD1 and the second detection trace PCD2. For example, the resistance of the first detection trace PCD1 of the display structure 1 is set to R PCD1 , set the resistance of touch structure 2 to R PCD2 , then the parallel resistance of the first detection line PCD1 and the second detection line PCD2 conforms to the parallel resistance formula: Rtotal = (R PCD1 *R PCD2 ) / (R PCD1 +R PCD2); The first detection trace PCD1 of the display structure 1 is generally set in the metal layer, and the second detection trace PCD2 of the touch structure 2 is set in the metal layer or ITO (indium tin oxide, which has the characteristics of transparency and has a larger resistance than metal). If both the display structure 1 and the touch structure 2 use metal layer traces as detection traces, and the trace widths are roughly the same, then their resistance values ​​are roughly the same (the display area AA of the display structure 1 and the touch structure 2 is basically the same). Therefore, R PCD1 ≈R PCD2 , according to Rtotal=(R PCD1 *R PCD2 ) / (R PCD1 +R PCD2 ), we can see that R is always ≈(R PCD1 ÷2)≈(R PCD2 ÷2). At this time, if microcracks appear in PCD1 or PCD2, the impedance becomes larger or approaches infinity, and R is always ≈ R PCD1 ≈R PCD2 At this point, it can be determined that cracks occur in one of the structures, rather than in both structures.

[0057] However, this method still cannot determine which structure, the display structure 1 or the touch structure 2, has cracks.

[0058] Figure 5 A schematic diagram of the cross-sectional structure of a display panel according to an embodiment of the present application is shown. Figure 6 A schematic diagram of the top view structure of a display panel according to an embodiment of the present application is shown.

[0059] In order to determine the specific location of the crack, Figure 5 and Figure 6 As shown, 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] The display structure 1 comprises a first substrate, a test end and a first detection line PCD1 arranged on the first substrate, wherein the test end is located in the binding area B1, and the first detection line surrounds the display area AA and is located in the non-display area BAA and connected to the test end;

[0061] A touch control structure 2, arranged at the light-emitting side of the display structure 1, comprising a second substrate and a second detection trace PCD2 arranged on the second substrate, wherein the second detection trace 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 trace PCD1 and the second detection trace PCD2 are connected in parallel, and at least one detection device is arranged on the first detection trace PCD1 and / or the second detection trace PCD2;

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

[0063] Exemplarily, the display structure 1 may be an organic light emitting diode (OLED) display panel, and the touch structure 2 may be a touch panel mounted on the outside of the display panel. In this embodiment, an adhesive layer 3 is provided between the display structure 1 and the touch module. That is, the OLED display panel and the touch panel are adhered together by adhesive. The detection unit is a display driver chip DIC having a binding area B1. The integrated circuit located in the display area AA and the wirings located in the non-display area B are all bound to the display driver chip DIC. Therefore, the first detection wiring PCD1 and / or the second detection wiring 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 wiring PCD1 and the second detection wiring PCD2, so that the electrical parameters of the first detection wiring PCD1 and the second detection wiring PCD2 are different. The detection unit detects the different electrical parameters of the first detection wiring PCD1 and the second detection wiring PCD2, so that according to the different electrical parameters, it can be determined whether cracks are generated on the display structure 1 and / or the touch structure 2, so that the specific location of the crack can be determined, thereby improving 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 end includes a first test end and a second test end, the first pin is electrically coupled to the first test end, and the second pin is electrically coupled to the second test end; the electrical parameters of the first detection trace and the second detection trace include a resistance value or conductivity measured between the first test end and the second test end.

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

[0066] In this embodiment, if Figure 6 As shown, the at least one detection device includes a first resistor R1 arranged on the first detection line and / or a second resistor R2 arranged on the second detection line.

[0067] Exemplarily, the detection device includes a first resistor R1 arranged on a first detection trace PCD1 and a second resistor R2 arranged on a second detection trace PCD2. The resistance value of the first detection trace PCD1 provided with the first resistor R1 is different from the resistance value of the second detection trace PCD2 provided with the second resistor R2. For example, the resistance value of the first detection trace provided with the first resistor is more than twice the resistance value of the second detection trace provided with the second resistor. It can be understood that since the first detection trace PCD1 and the second detection trace PCD2 are usually conductive wires, the resistance values ​​of the two are much lower than the first resistor R1 and the second resistor R2. Therefore, optionally, the aforementioned resistance relationship can also be equivalent to the resistance value of the first resistor R1 being more than twice that of the second resistor R2. In this way, by selecting the first resistor R1 and the second resistor R2 with specific resistance values, basically the same effect can be achieved, while saving design time and improving efficiency.

[0068] For example, when the resistance of the second detection line PCD2 provided with the second resistor R2 is more than twice the resistance of the first detection line provided with the first resistor, that is, R PCD2 =2R PCD1 If there is no crack or open circuit in the display structure 1 and the touch structure 2, 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 is cracked and open, the detection unit detects that the parallel resistance of the first detection line and the second detection line is Rtotal≈R PCD2 =2R PCD1 If the touch structure 2 has a crack and an open circuit, then Rtotal ≈ R PCD1 If cracks open in both display structure 1 and touch structure 2, the impedance R is always large, or the area is infinite. Therefore, the resistance value is 2 / 3R PCD1 , 2R PCD1 , R PCD1 When the total value of R is infinite, it can be determined which structure has cracks.

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

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

[0071] Furthermore, an orthographic projection of the second detection line on the first substrate does not overlap with an orthographic projection of the first detection line on the first substrate.

[0072] Exemplarily, the orthographic projections of the first detection line and the second detection line on the substrate do not overlap, so that the signal influence between the signal lines can be reduced, ensuring that the signal lines can stably transmit signals.

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

[0074] like Figure 7 As shown, 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:

[0075] The display structure 1 comprises a first substrate, a test end and a first detection line arranged on the first substrate, wherein the test end is located in the binding area B1, and the first detection line surrounds the display area AA and is located in the non-display area B and is connected to the test end;

[0076] A touch control structure 2, arranged at the light-emitting side of the display structure 1, comprising a second substrate and a second detection line arranged on the second substrate, wherein the second detection line 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 and the second detection line are connected in parallel, and at least one detection device is arranged on the first detection line and / or the second detection line;

[0077] The detection unit is arranged on the first substrate and electrically coupled to the test end, and is configured to detect electrical parameters of the first detection line and the second detection line through the test end to determine whether cracks occur on the display structure 1 and / or the touch structure 2.

[0078] Exemplarily, the display structure 1 may be an organic light emitting diode (OLED) display panel, and the touch structure 2 may be a touch panel disposed on the display structure 1. In the present embodiment, an adhesive layer 3 is disposed between the display structure 1 and the touch structure 2. That is, the display structure 1 and the touch structure 2 are adhered together by adhesive. The detection unit is a driver chip IC provided with a binding area B1. The integrated circuit located in the display area AA and each routing located in the non-display area B are all bound to the display driver chip DIC. Therefore, the first detection routing and / or the second detection routing are connected to the display driver chip DIC. At least one detection device is disposed on the first detection routing and the second detection routing through the display driver chip DIC to detect that the electrical parameters of the first detection routing and the second detection routing are different. The detection unit detects different electrical parameters of the first detection routing and the second electrical detection routing, thereby determining whether cracks are generated on the display structure 1 and / or the touch structure 2 according to different electrical parameters, thereby being able to accurately determine the display position of the cracks and improve the detection effect of the display panel.

[0079] like Figure 7 As shown, the detection unit includes a first pin and a second pin for detecting the electrical parameters, the test end includes a first test end and a second test end, the first pin is electrically coupled to the first test end, and the second pin is electrically coupled to the second test end; the electrical parameters of the first detection trace and the second detection trace include a resistance value or conductivity measured between the first test end and the second test end.

[0080] For example, Figure 7As shown, the first test end can be the test end connected to the detection unit on the left side of the first detection line, and the second test end can be the test end connected to the detection unit on the right side of the first detection line. The first pin of the detection unit can be a terminal connected to the first test end, and the second pin can be a terminal connected to the second test end. Since the first detection line and the second detection line are connected in parallel, the detection unit is connected to the first test end through the first pin, and the second pin is connected to the second test end, and the resistance value or conductivity between the first test end and the second test end of the first detection line is measured through the first pin and the second pin. The parallel resistance value or conductivity of the first detection line and the second detection line is also measured, and the position of the crack can be determined by calculating the resistance value or conductivity of each monitoring line.

[0081] In this embodiment, if Figure 7 As shown, the at least one detection device includes a first diode D1 arranged on the first detection line.

[0082] Exemplarily, the detection device includes a first diode D1 disposed on a first detection trace, and detection is performed by applying a cutoff voltage (eg, a voltage that turns the first diode D1 off) between the first test terminal and the second test terminal.

[0083] Optionally, the first diode D1 may be a Zener diode, and the turn-off voltage loaded between the first test terminal and the second test terminal may be a low voltage that puts the Zener diode in a reverse bias state. At this time, since the first diode D1 is not reversely broken down and turned on, the first detection line PCD1 is equivalent to an open circuit, that is, the resistance value is infinite. Therefore, the resistance value read by the detection unit may be equivalent to the resistance value R of the second detection line. PCD2 .

[0084] Next, detection is performed by applying a conduction voltage (eg, a voltage that causes the first diode D1 to be in a conducting state) between the first test terminal and the second test terminal.

[0085] Optionally, when the first diode D1 is a Zener diode, the conduction voltage loaded between the first test terminal and the second test terminal may be a high voltage that puts the Zener diode in a reverse breakdown state. At this time, the first diode D1 is turned on, and since the first detection line and the second detection line are connected in parallel, the parallel resistance R of the first detection line and the second detection line is obtained. 总 At this point, we know the resistance R of the second detection line PCD2 And the resistance of the parallel resistor, according to the formula R 总 =(R PCD1 *R PCD2 ) / (R PCD1 +R PCD2 ), the resistance R of the first detection line can be solved PCD1According to the resistance R of the first detection line PCD1 and the resistance R of the second detection line PCD2 , it can be accurately determined whether the crack occurs in the display structure 1 or the touch structure 2.

[0086] like Figure 7 As shown, the orthographic projection of the first substrate overlaps with the orthographic projection of the second substrate.

[0087] Exemplarily, the first substrate and the second substrate are of the same size and are stacked together, so that the appearance of the display panel is more beautiful.

[0088] Furthermore, an orthographic projection of the second detection line on the first substrate does not overlap with an orthographic projection of the first detection line on the first substrate.

[0089] Exemplarily, the orthographic projections of the first detection line and the second detection line on the substrate do not overlap, so that the signal impression between the signal lines can be reduced, ensuring that the signal lines stably transmit signals.

[0090] Figure 8 A schematic diagram of a top view structure of a display panel according to another embodiment of the present application is shown.

[0091] like Figure 8 As shown, the present embodiment is different from the above embodiment in that at least one detection device includes a second diode D2 disposed on the second detection trace PCD2.

[0092] Exemplarily, the detection device includes a second diode D2 disposed on the second detection trace PCD2. The detection is performed by loading a cutoff voltage (eg, a voltage that turns the second diode D2 off) between the first test terminal and the second test terminal.

[0093] Optionally, the second diode D2 may be a Zener diode, and the turn-off voltage loaded between the first test terminal and the second test terminal may be a low voltage that puts the Zener diode in a reverse bias state. At this time, since the second diode D2 is not reversely broken down and turned on, the second detection line PCD2 is equivalent to an open circuit, that is, the resistance value is infinite. Therefore, the resistance value read by the detection unit is equivalent to the resistance value R of the first detection line PCD1. PCD1 .

[0094] Next, detection is performed by applying a conduction voltage (eg, a voltage that causes the second diode D2 to be in a conducting state) between the first test terminal and the second test terminal.

[0095] Optionally, when the second diode D2 is a Zener diode, the conduction voltage loaded between the first test terminal and the second test terminal may be a high voltage that puts the Zener diode in a reverse breakdown state. At this time, the second diode D2 is turned on, and since the first detection line and the second detection line are connected in parallel, the parallel resistance R of the first detection line and the second detection line is obtained. 总 At this point, we know the resistance value of the first detection line, R PCD1 And the resistance value of the parallel resistor Rtotal, according to the formula R 总 =(R PCD1 *R PCD2 ) / R PCD1 +R PCD2 ), the resistance value R of the second detection line can be solved PCD2 According to the resistance R of the first detection line PCD1 and the resistance R of the second detection line PCD2 , it can be accurately determined whether the crack occurs in the display structure 1 or the touch structure 2.

[0096] Fig. 9 A flow chart of a crack detection method for a display panel according to an embodiment of the present application is shown.

[0097] like Fig. 9 As shown, based on the same inventive concept, the present application also provides a method for detecting cracks in a display panel, the method being used for the display panel described in the above part, and the method comprising the following steps:

[0098] Step 102: Load a detection signal between the first test end and the second test end;

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

[0100] Step 106: Determine whether cracks occur on the display structure and / or the touch structure according to the resistance value.

[0101] For example, when the resistance of the second detection line provided with the second resistor is more than twice the resistance of the first detection line provided with the first resistor, that is, R PCD2 =2R PCD1 , if there is no crack or open circuit in the display structure and the touch structure, then: R 总 =(R PCD1 *R PCD2 ) / (R PCD1 +R PCD2 )=(R PCD1 *2R PCD1 ) / (R PCD1 +2R PCD1 )=2 / 3R PCD1If the display structure is cracked and open, the detection unit detects that the parallel resistance of the first detection line and the second detection line is R 总 ≈R PCD2 =2R PCD1 If the touch structure has cracks and opens, then R 总 ≈R PCD1 If cracks open the display structure and the touch structure, the impedance R is always large, or the area is infinite. Therefore, the resistance value is 2 / 3R PCD1 , 2R PCD1 , R PCD1 and R 总 When the value is infinite, it can be determined which structure has crack opening.

[0102] Fig.10 A flow chart of a crack detection method for a display panel according to an embodiment of the present application is shown.

[0103] like Fig.10 As shown, based on the same inventive concept, the present application also provides a method for detecting cracks in a display panel, the method being used for the display panel described in the above part, and the method comprising the following steps:

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

[0105] Step 204: applying a second voltage between the first test end and the second test end to turn on the first diode or the second diode, and obtaining a second resistance value between the first test end and the second test end;

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

[0107] Step 208: Determine whether cracks occur on the display structure and / or the touch structure according to the first resistance value and the third resistance value.

[0108] Exemplarily, based on the structure of the display panel, the detection device includes a first diode D1 disposed on the first detection line. By loading a low voltage between the first test terminal and the second test terminal for detection, the first diode D1 is not turned on due to the low voltage, and the detection unit can read the first resistance value (i.e., the resistance value R of the second detection line). PCD2); then, a high voltage is applied between the first test terminal and the second test terminal for detection. Since the high voltage is high, the first diode D1 is turned on. Since the first detection line and the second detection line are connected in parallel, the second resistance value (parallel resistance Rtotal) of the first detection line and the second detection line is obtained. At this time, the first resistance value (i.e., the resistance value of the second detection line Rtotal) is known. PCD2 ) and the second resistance (the resistance of the parallel resistor R 总 ), according to the formula R 总 =(R PCD1 *R PCD2 ) / (R PCD1 +R PCD2 ), the resistance value of the first detection line R can be solved PCD1 (That is, the third resistance value.) According to the first resistance value and the third resistance value, it can be accurately determined whether the crack occurs in the display structure 1 or the touch structure 2 .

[0109] Further, in this embodiment, determining whether cracks occur on the display structure and / or the touch structure according to the first resistance value and the third resistance value includes:

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

[0111] In response to the third resistance being greater than a preset resistance range, determining that a crack is generated in the display structure;

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

[0113] Exemplarily, the preset resistance range is 100K-600K. When the first resistance is greater than the preset resistance range, it means that the resistance of the second detection line is too high and the touch structure 2 has cracks. When the second resistance is greater than the preset resistance range, it means that the resistance of the first detection line is too high, which means that the display structure 1 has cracks. When both the first resistance and the third resistance are greater than the preset resistance range, it means 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. The specific location of the crack can be accurately determined by the resistance judgment method, so as to facilitate the subsequent repair of the display panel.

[0114] Alternatively, the detection device includes a second diode D2 disposed on the second detection trace PCD2. By loading a low voltage between the first test terminal and the second test terminal for detection, the second diode D2 is not turned on due to the low voltage, and the detection unit can read the resistance value R of the first detection trace. PCD1(first resistance value); then, a high voltage is applied between the first test terminal and the second test terminal for detection. Since the high voltage is high, the second diode D2 is turned on. Since the first detection line and the second detection line are connected in parallel, the parallel resistance Rtotal of the first detection line and the second detection line (second resistance value) is obtained. At this time, the resistance value R of the first detection line is known. PCD1 And the resistance value of the parallel resistor Rtotal, according to the formula Rtotal = (R PCD1 *R PCD2 ) / (R PCD1 +R PCD2 ), the resistance value R of the second detection line can be solved PCD2 (third resistance value). According to the resistance value R of the first detection line PCD1 (third resistance) and the resistance of the second detection line R PCD2 (first resistance value), it can be accurately determined whether the crack occurs in the display structure 1 or the touch structure 2.

[0115] In this embodiment, determining whether cracks occur on the display structure and / or the touch structure according to the first resistance value and the third resistance value includes:

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

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

[0118] In response to the first resistance value and the third resistance value being both greater than a preset resistance value range, it is determined that cracks are generated in both the display structure and the touch structure.

[0119] Exemplarily, the preset resistance range is 100K-600K. When the first resistance is greater than the preset resistance range, it means that the resistance of the first detection line is too high, and cracks appear in the display structure 1. When the second resistance is greater than the preset resistance range, it means that the resistance of the second detection line is too high, which means that cracks appear in the touch structure 2. When both the first resistance and the third resistance are greater than the preset resistance range, it means that cracks appear in both structures. Therefore, it is determined that cracks appear in both the display structure 1 and the touch structure 2. The specific location of the crack can be accurately determined by the resistance judgment method, so as to facilitate the subsequent repair of the display panel.

[0120] Based on the same inventive concept, the present application also provides a display device, comprising any of the display panels described above.

[0121] The display device may be: an LED display, an OLED display, a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display function, but the embodiments of the present disclosure are not limited thereto.

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

[0123] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0124] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the crack detection method for the display panel described in any of the above embodiments is implemented.

[0125] Fig.11 A more specific schematic diagram of the hardware structure of an electronic device provided in this embodiment is shown, and the device may 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 in the device.

[0126] The processor 1010 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

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

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

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

[0130] The bus 1050 includes a path that transmits information between the various components of the device (eg, the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040).

[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 may also include other components necessary for normal operation. In addition, it can be understood by those skilled in the art that the above device may also only include the components necessary for implementing the embodiments of the present specification, and does not necessarily include all the components shown in the figure.

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

[0133] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the crack detection method for the display panel as described in any of the above embodiments.

[0134] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, 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, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0135] The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the crack detection method for the display panel as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0136] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0137] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram 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 in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0138] Although the present application has been described in conjunction with specific embodiments of the present application, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0139] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of 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 includes a binding area arranged on at least one side of the display area, and the display panel includes: The display structure includes a first substrate, a test end and a first detection line arranged on the first substrate, wherein the test end is located in the binding area, and the first detection line surrounds the display area and is located in the non-display area and connected to the test end; A touch structure, arranged at the light-emitting side of the display structure, comprising a second substrate and a second detection line arranged on the second substrate, wherein the second detection line surrounds the display area and is located in the non-display area and is connected to the test end so that the first detection line and the second detection line are connected in parallel, and at least one detection device is arranged on the first detection line and / or the second detection line; A detection unit is disposed on the first substrate and electrically coupled to the test end, and is configured to detect electrical parameters of the first detection line and the second detection line through the test end to determine whether cracks occur on the display structure and / or the touch structure.

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 end includes a first test end and a second test end, the first pin is electrically coupled to the first test end, and the second pin is electrically coupled to the second test end; the electrical parameters of the first detection trace and the second detection trace include a resistance value or conductivity measured between the first test end and the second test end.

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

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

5. The display panel according to claim 4, characterized in that: The resistance value of the first detection line provided with the first resistor is more than twice the resistance value of the second detection line provided 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 line on the first substrate does not overlap with the orthographic projection of the first detection line on the first substrate.

9. The display panel according to claim 2, characterized in that: An adhesive layer is provided between the display structure and the touch module.

10. A method for detecting cracks in a display panel, characterized in that: The method is used for the display panel according to any one of claims 3 to 5, and the method comprises: Loading a detection signal between the first test end and the second test end; Measuring the resistance value between the first test end and the second test end; Whether cracks are generated on the display structure and / or the touch structure is determined according to the resistance value.

11. A method for detecting cracks in a display panel, characterized in that: The method is used for the display panel according to claim 6, and the method comprises: Applying a first voltage between the first test terminal and the second test terminal to cut off the first diode or the second diode, and obtaining a first resistance value between the first test terminal and the second test terminal; Applying a second voltage between the first test terminal and the second test terminal to turn on the first diode or the second diode, and obtaining a second resistance value between the first test terminal and the second test terminal; Obtaining a third resistance value according to the first resistance value and the second resistance value; Whether cracks are generated on the display structure and / or the touch structure is determined according to the first resistance value and the third resistance value.

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

13. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 9.

Images