Display panel, detection method thereof and display device

Abstract

The invention discloses a display panel, a detection method thereof and a display device. The display panel comprises a substrate, a circuit layer and a light-emitting element, the circuit layer comprises a plurality of binding bonding pads, and the binding bonding pads comprise main bonding pads and redundant bonding pads; the light-emitting element comprises a main light-emitting element and a redundant light-emitting element, the main bonding pad is used for being connected with the main light-emitting element, and the redundant bonding pad is used for being connected with the redundant light-emitting element when the main bonding pad is abnormal; the circuit layer further comprises a plurality of pixel driving circuits and a plurality of detection circuits, the pixel driving circuits are electrically connected with the binding pads, and the detection circuits are electrically connected with part of the redundant pads; the detection circuit is configured to detect the communication state of the redundant light-emitting element and the redundant bonding pad after the redundant bonding pad repairs the redundant light-emitting element. The communication state between the redundant bonding pad and the redundant light-emitting element is judged by using the detection circuit, so that the overall display effect of the display panel is ensured, the product yield is effectively improved, and the cost is reduced.

Description

Technical Field

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

[0002] With the continuous development of display technology, Micro LED (Micro Light Emitting Diode) display panels have incomparable advantages in terms of luminous power, power consumption, contrast, response speed, and lifespan.

[0003] Currently, the Micro LED manufacturing process involves transferring and bonding arrayed chips to a target substrate. During this process, a large number of redundant bits must be reserved on the target substrate to allow for repair of damaged chips. However, after the redundant bits are repaired, circuitry cannot detect whether the Micro LEDs have been bonded, severely impacting the display quality of the device. Summary of the Invention

[0004] The present invention provides a display panel, a detection method thereof, and a display device, so as to achieve accurate detection of the bonding state between redundant bits and light-emitting elements, improve product yield, and reduce costs.

[0005] In a first aspect, the present invention provides a display panel, characterized in that the display panel comprises:

[0006] substrate;

[0007] A circuit layer is located on one side of the substrate; the circuit layer includes a plurality of binding pads, and the binding pads include a main pad and a redundant pad;

[0008] a light-emitting element located on a side of the circuit layer away from the base substrate, the light-emitting element including a main light-emitting element and a redundant light-emitting element, the main solder pad being used to connect the main light-emitting element, and the redundant solder pad being used for connection to the redundant light-emitting element when the main solder pad is abnormal;

[0009] The circuit layer further includes a plurality of pixel driving circuits and a plurality of detection circuits, wherein the pixel driving circuits are electrically connected to the binding pads, and the detection circuits are electrically connected to some of the redundant pads;

[0010] The detection circuit is configured to detect a connection state between the redundant light emitting element and the redundant pad after the redundant pad repairs the redundant light emitting element.

[0011] In a second aspect, the present invention provides a method for detecting a display panel, including the display panel according to any one of the first aspects, the method for detecting the display panel comprising:

[0012] Providing a display panel to be tested;

[0013] Obtaining a position of a main pad having an abnormality in the display panel to be detected;

[0014] Determine the redundant pad position according to the main pad position;

[0015] repairing the redundant light-emitting element according to the position of the redundant pad;

[0016] The detection circuit is controlled to be turned on to obtain a connection state between the redundant light-emitting element and the redundant pad.

[0017] In a third aspect, the present invention provides a display device comprising the display panel according to any one of the first inventions.

[0018] The technical solution of an embodiment of the present invention provides a display panel, comprising: a base substrate; a circuit layer located on one side of the base substrate; the circuit layer comprising a plurality of bonding pads, the bonding pads comprising a main bonding pad and a redundant bonding pad; light-emitting elements located on a side of the circuit layer away from the base substrate, the light-emitting elements comprising a main light-emitting element and a redundant light-emitting element, the main bonding pad being used to connect the main light-emitting element, and the redundant bonding pad being used to connect the redundant light-emitting element when the main bonding pad is abnormal; the circuit layer further comprising a plurality of pixel driving circuits and a plurality of detection circuits, the pixel driving circuits being electrically connected to the bonding pads, and the detection circuits being electrically connected to some of the redundant bonding pads; the detection circuits being configured to detect the connectivity between the redundant light-emitting element and the redundant bonding pads after the redundant light-emitting element is repaired by the redundant bonding pads. By providing the detection circuit in the display panel, the connectivity between the redundant bonding pads and the redundant light-emitting element is determined after the redundant bonding pads have repaired the redundant light-emitting element, thereby preventing connectivity abnormalities between the redundant bonding pads and the redundant light-emitting element from affecting the overall display effect of the display panel, thereby effectively improving product yield and reducing costs.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0022] Figure 2 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0024] Figure 4 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0025] Figure 5 A schematic structural diagram of a pixel driving circuit provided by an embodiment of the present invention;

[0026] Figure 6 A schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0027] Figure 7 A driving timing diagram of a pixel driving circuit provided by an embodiment of the present invention;

[0028] Figure 8 A schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0029] Figure 9 A schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention;

[0030] Figure 10 A schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0031] Figure 11 A schematic flow chart of a method for detecting a display panel provided by an embodiment of the present invention;

[0032] Figure 12 A schematic flow chart of another display panel detection method provided by an embodiment of the present invention;

[0033] Figure 13 A schematic flow chart of another display panel detection method provided by an embodiment of the present invention;

[0034] Figure 14 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] Figure 1 A schematic structural diagram of a display panel provided by an embodiment of the present invention is shown in FIG. Figure 2 A structural diagram of another display panel provided by an embodiment of the present invention is shown in FIG. Figure 1 and Figure 2 As shown, the display panel includes: a base substrate 100; a circuit layer 101, located on one side of the base substrate 100; the circuit layer 101 includes a plurality of bonding pads 102, the bonding pads 102 include a main pad 103 and a redundant pad 104; a light-emitting element 105, located on a side of the circuit layer 101 away from the base substrate 100, the light-emitting element 105 includes a main light-emitting element 1051 and a redundant light-emitting element 1052, the main pad 103 is used to connect the main light-emitting element 1051, the redundant pad 104 is used to connect the main light-emitting element 1051, and the redundant pad 104 is used to connect the main light-emitting element 1051. 04 is used to connect the redundant light-emitting element 1052 when the main pad 103 is abnormal; the circuit layer 101 also includes multiple pixel driving circuits 106 and multiple detection circuits 107, the pixel driving circuit 106 is electrically connected to the binding pad 102, and the detection circuit 107 is electrically connected to part of the redundant pad 104; the detection circuit 107 is configured to detect the connectivity status of the redundant light-emitting element 1052 and the redundant pad 104 after the redundant pad 104 repairs the redundant light-emitting element 1052.

[0038] The substrate 100 may be a rigid substrate, such as a glass substrate, or a flexible substrate, such as a substrate made of a flexible organic polymer material. The material of the substrate 100 may be selected based on actual design requirements and is not specifically limited in the embodiments of the present invention. A circuit layer 101 is provided on one side of the substrate 100. The circuit layer 101 includes a bonding pad 102. The bonding pad 102 is used to bond with the light-emitting element 105. The bonding pad 102 includes a main pad 103 and a redundant pad 104. Typically, the main pad 103 and the redundant pad 104 are provided in a one-to-one correspondence. The main pad 103 and the redundant pad 104 each include a positive pad and a negative pad. The negative pad is electrically connected to the negative electrode of the light-emitting element 105, and the positive pad is electrically connected to the positive electrode of the light-emitting element 105. The light-emitting element 105 includes a main light-emitting element 1051 and a redundant light-emitting element 1052. The main light-emitting element 1051 and the redundant light-emitting element 1052 are arranged in parallel. The main pad 103 is used to connect the main light-emitting element 1051. When the main pad 103 is normal, the main light-emitting element 1051 is lit and the redundant pad 104 is not working. When the main pad 103 is abnormal, the redundant pad 104 corresponding to the main pad 103 is activated to allow the redundant light-emitting element 1052 to be transferred to the redundant pad 104. The redundant light-emitting element 1052 is electrically connected to the redundant pad 104 to ensure that the redundant light-emitting element 1052 at the corresponding position is lit, avoiding the occurrence of dark spots on the display and affecting the overall display effect of the display panel. The light-emitting element 105 may include a micro light-emitting element 105 such as a sub-millimeter light-emitting diode (Mini LED) or a micron light-emitting diode (Micro LED). The size of the Mini LED can be around 100μm-500μm, and the size of the Micro LED can be below 100μm. The circuit layer 101 also includes a plurality of pixel driving circuits 106. The pixel driving circuits 106 may be 2T1C circuits (i.e., circuits having two thin-film transistors and one storage capacitor), or 7T1C circuits (i.e., circuits having seven thin-film transistors and one storage capacitor). The embodiment of the present invention does not limit the specific structure of the pixel driving circuits 106. The pixel driving circuits 106 are electrically connected to the light-emitting elements 105 via the bonding pads 102 to provide driving signals to the light-emitting elements 105 to ensure normal lighting of the light-emitting elements 105.The circuit layer 101 also includes multiple detection circuits 107, which are electrically connected to some redundant pads 104. The detection circuits 107 start working after transferring the redundant light-emitting elements 1052 at the redundant pads 104, and are used to detect the connectivity between the redundant light-emitting elements 1052 and the redundant pads 104. When the redundant light-emitting elements 1052 are connected to the redundant pads 104, the detection circuits 107 can collect the signals output through the redundant pads 104, and the redundant light-emitting elements 1052 can be normally lit. When the redundant light-emitting elements 1052 are not connected to the redundant pads 104, the detection circuits 107 cannot collect the signals output through the redundant pads 104, and the redundant light-emitting elements 1052 do not light up. This may indicate that there is a fault in the redundant light-emitting elements 1052 or the redundant pads 104. It is necessary to use the driver chip 108 to obtain the current position coordinates of the redundant pads 104 for subsequent inspection. The detection circuit 107 can also be electrically connected to the pixel driving circuit 106 to multiplex the signals in the pixel driving circuit 106 , reduce the number of detection ports in the detection circuit 107 , reduce circuit wiring, and reduce the area occupied by the detection circuit 107 .

[0039] The embodiment of the present invention sets a detection circuit in the display panel, and the detection circuit is electrically connected to some redundant pads. The detection circuit is started after the redundant pads repair the redundant light-emitting elements, and detects the connectivity between the redundant light-emitting elements and the redundant pads, thereby avoiding abnormal connectivity between the redundant pads and the redundant light-emitting elements, which affects the overall display effect of the display panel, and can effectively improve product yield and reduce costs.

[0040] Optional, continue to refer to Figure 1 and Figure 2 The redundant pad 104 includes at least a redundant negative pad 1041, and the redundant negative pad 1041 includes a first redundant sub-pad 11 and a second redundant sub-pad 12, and the first redundant sub-pad 11 and the second redundant sub-pad 12 are arranged at intervals; the first redundant sub-pad 11 is electrically connected to the low voltage signal terminal PVEE, and the second redundant sub-pad 12 is electrically connected to the detection circuit 107.

[0041] The redundant pad 104 includes a redundant negative pad 1041 and a redundant positive pad 1042. The main pad 103 includes a main negative pad 1031 and a main positive pad 1032. Both the main positive pad 1032 and the redundant negative pad 1041 are electrically connected to the high-voltage signal terminal PVDD. The redundant negative pad 1041 includes a first redundant sub-pad 11 and a second redundant sub-pad 12. The first and second redundant sub-pads 11 and 12 are spaced apart. The spacing between the first and second redundant sub-pads is smaller than the spacing between the positive and negative electrodes of the redundant light-emitting element 1052, ensuring that the redundant light-emitting element 1052 can be simultaneously connected to the first and second redundant sub-pads 11 and 12. The main negative pad 1031 and the first redundant sub-pad 11 are both electrically connected to the low-voltage signal terminal PVEE. The second redundant sub-pad 12 is electrically connected to the detection circuit 107. When second redundant sub-pad 12 is enabled by redundant pad 104, redundant light-emitting element 1052 is transferred to redundant pad 104. The positive electrode of redundant light-emitting element 1052 is connected to redundant positive pad 1042, and the negative electrode of redundant light-emitting element 1052 is connected to first redundant sub-pad 11 and second redundant sub-pad 12, respectively. Thus, first redundant sub-pad 11 and second redundant sub-pad 12 are connected. One end of detection circuit 107 is connected to second redundant pad 104. If detection circuit 107 can detect the signal output through second redundant pad 104, it is considered that the connection between redundant light-emitting element 1052 and redundant pad 104 is normal. If detection circuit 107 cannot detect the signal output through second redundant pad 104, it is considered that the connection between redundant light-emitting element 1052 and redundant pad 104 is abnormal.

[0042] Optional, Figure 3 A structural diagram of another display panel provided by an embodiment of the present invention is shown in FIG. Figure 2 and Figure 3 As shown, the area of the first redundant sub-pad 11 is greater than or equal to the area of the second redundant sub-pad 12. Figure 2 As shown, the redundant negative pad 1041 can be evenly divided to form a first redundant sub-pad 11 and a second redundant sub-pad 12, and the area of the first redundant sub-pad 11 is equal to the area of the second redundant sub-pad 12, reducing the difficulty of preparation; or as shown in FIG. Figure 3 As shown, the redundant negative pad 1041 can be differentially divided to form a first redundant sub-pad 11 and a second redundant sub-pad 12. The area of the first redundant sub-pad 11 is larger than that of the second redundant sub-pad 12. The larger area of the first redundant sub-pad 11 increases the connection area with the low-voltage signal terminal PVEE, thereby ensuring the connection firmness between the redundant light-emitting element 1052 and the redundant pad 104, and further ensuring the subsequent detection circuit 107 to accurately detect the connection status between the redundant light-emitting element 1052 and the redundant pad 104.

[0043] Optional, Figure 4 A structural diagram of another display panel provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, the display panel further includes a driving chip 108, and the detection circuit 107 includes a detection transistor M8. A first electrode of the detection transistor M8 is electrically connected to the second redundant sub-pad 12, a second electrode of the detection transistor M8 is electrically connected to the detection end of the driving chip 108, and a gate of the detection transistor M8 is electrically connected to the first scan signal end.

[0044] The display panel is further provided with a driver chip 108, which is electrically connected to the detection circuit 107 to receive the signal detected by the detection circuit 107 and determine the current connection status between the redundant light-emitting element 1052 and the redundant pad 104. Specifically, the detection circuit 107 includes a detection transistor M8, which can be a P-type transistor or an N-type transistor. Figure 4 Detection transistor M8 is illustrated as a P-type transistor. A first electrode of detection transistor M8 is electrically connected to second redundant sub-pad 12, a second electrode of detection transistor M8 is electrically connected to a detection terminal of driver chip 108, and a gate of detection transistor M8 is electrically connected to a third scan signal terminal SCAN3. Third scan signal terminal SCAN3 is used to output an enable signal after redundant light-emitting element 1052 is repaired on redundant pad 104, turning on detection transistor M8. This facilitates transmission of a detection signal to driver chip 108, thereby determining the connectivity between redundant light-emitting element 1052 and redundant pad 104.

[0045] Optional, Figure 5 A schematic structural diagram of a pixel driving circuit provided by an embodiment of the present invention is shown in FIG. Figure 6 A schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention is shown. Figure 7 A driving timing diagram of a pixel driving circuit provided by an embodiment of the present invention is shown in FIG. Figure 5 、 Figure 6 and Figure 7As shown, the pixel driving circuit 106 includes: an initialization unit 1061, a data writing unit 1062, a threshold compensation unit 1063, a light emitting control unit 1064, a storage capacitor Cst, a reset unit 1065 and a driving transistor M3; the initialization unit 1061 is electrically connected between the first initialization signal terminal and the first node N1; the initialization unit 1061 is used to provide an initialization signal of the initialization signal terminal to the first node N1 during the initialization phase; the data writing unit 1062 is electrically connected between the data signal terminal and the first electrode of the driving transistor M3; the gate of the driving transistor M3 and the first end of the storage capacitor Cst are electrically connected to the first node N1; the second end of the storage capacitor Cst is electrically connected to the power signal terminal; the threshold compensation unit 1063 is electrically connected to the second electrode of the driving transistor M3 and the first node N 1; the data writing unit 1062 is used to provide a data voltage signal of the data signal end to the first node N1 in the data writing phase; the threshold compensation unit 1063 is used to compensate the threshold voltage of the driving transistor M3 to the first node N1; the reset unit 1065 is electrically connected between the second initialization signal end and the first end of the light-emitting element 105; the second end of the light-emitting element 105 is electrically connected to the low voltage signal end PVEE; the reset unit 1065 is used to provide an initialization signal of the second initialization signal end to the first end of the light-emitting element 105 before the light-emitting phase; the light-emitting control unit 1064 is electrically connected between the power signal end and the light-emitting element 105; the light-emitting control unit 1064 is used to control the driving current generated by the driving transistor M3 to flow into the light-emitting element 105 in the light-emitting phase, so as to drive the light-emitting element 105 to emit light.

[0046] The initialization unit 1061 includes a fifth transistor M5, the data writing unit 1062 includes a second transistor M2, the threshold compensation unit 1063 includes a fourth transistor M4, the light emitting control unit 1064 includes a first light emitting control unit 13 and a second light emitting control unit 14, the first light emitting control unit 13 includes a first transistor M1, the second light emitting control unit 14 includes a sixth transistor M6, and the reset unit 1065 includes a seventh transistor M7. When the first transistor M1, the second transistor M2, the fourth transistor M4, the fifth transistor M5, the sixth transistor M6, the seventh transistor M7, and the driving transistor M3 are all P-type transistors, the operation process of the pixel driving circuit 106 includes the following stages:

[0047] During the initialization phase, the first scan signal provided by the first scan signal terminal SCAN1 is a low-level signal, turning on the fifth transistor M5 and the seventh transistor M7. The second scan signal provided by the second scan signal terminal SCAN2 and the light-emission control signal provided by the light-emission control signal terminal EMIT are both high-level signals, turning off the first transistor M1, the second transistor M2, the fourth transistor M4, the sixth transistor M6, and the driving transistor M3. The initialization signal from the first initialization signal terminal VREF1 is written to the first node N1 via the turned-on fifth transistor M5 to initialize the gate storage capacitor Cst of the driving transistor M3. The initialization signal from the second initialization signal terminal VREF2 is used to initialize the positive electrode of the light-emitting element 105 via the turned-on seventh transistor M7. The initialization signal provided by the first initialization signal terminal VREF1 is a low-level signal, ensuring that the driving transistor M3 is turned on in the next phase.

[0048] In stage t2, which is the data writing stage, the second scanning signal provided by the second scanning signal terminal SCAN2 is a low-level signal, so that the second transistor M2 and the fourth transistor M4 are both turned on; the first scanning signal provided by the first scanning signal terminal SCAN1 and the light-emitting control signal provided by the light-emitting control signal terminal EMIT are both high-level signals, so that the first transistor M1, the third transistor M3, the seventh transistor M7 and the eighth transistor M8 are all turned off; the data voltage signal of the data signal terminal DATA is sequentially written into the first node N1M1, that is, the gate of the driving transistor M3 and the first end of the storage capacitor Cst through the turned-on second transistor M2, the driving transistor M3 and the fourth transistor M4, so that the gate voltage of the driving transistor M3 gradually increases until the voltage difference between the gate voltage of the driving transistor M3 and the first electrode of the driving transistor M3 is equal to the threshold voltage Vth of the driving transistor M3, and the voltage of the first node N1 is stored in the storage capacitor Cst.

[0049] In stage t3, which is the light-emitting stage, the light-emitting control signal provided by the light-emitting control signal terminal EMIT is a low-level signal, so that the first transistor M1 and the sixth transistor M6 are both turned on, the second scan signal provided by the second scan signal terminal SCAN2 and the first scan signal provided by the first scan signal terminal SCAN1 are both high-level signals, and the second transistor M2, the fourth transistor M4, the fifth transistor M5 and the seventh transistor M are all turned off; the power signal terminal is the high power signal terminal PVDD, and the power signal Vpvdd of the high power signal terminal PVDD is written into the first electrode of the driving transistor M3 through the turned-on first transistor M1 and the sixth transistor M6. At this time, the driving transistor M3 is turned on, and the driving current generated by the driving transistor M3 flows into the light-emitting element 105 through the sixth transistor M6, driving the light-emitting element 105 to emit light. When the main light-emitting element 1051 is normal, the driving current generated by the driving transistor M3 flows into the main light-emitting element 1051 through the sixth transistor M6, and the main light-emitting element 1051 is lit; when the main light-emitting element 1051 is abnormal, the first end of the redundant light-emitting element 1052 can be electrically connected to the sixth transistor M6, and the connectivity between the redundant light-emitting element 1052 and the redundant pad 104 is normal. At this time, the driving current generated by the driving transistor M3 flows into the redundant light-emitting element 1052 through the sixth transistor M6, and the redundant light-emitting element 1052 is lit.

[0050] In stage t4, i.e., the detection stage, the first scan signal provided by the first scan signal terminal SCAN1, the second scan signal provided by the second scan signal terminal SCAN2, and the light control signal provided by the light control signal terminal EMIT are all high-level signals, turning off the first transistor M1, the second transistor M2, the driving transistor M3, the fourth transistor M4, the fifth transistor M5, the sixth transistor M6, and the seventh transistor M7. The detection transistor M8 is a P-type transistor, and the third scan signal provided by the third scan signal terminal SCAN3 is a low-level signal, turning on the detection transistor M8. When the connection between the redundant light-emitting element 1052 and the redundant pad 104 is normal, the low-voltage signal output by the low-voltage signal terminal PVEE is output through the second redundant pad 104 and transmitted to the detection terminal of the detection transistor M8 through the detection transistor M8. When the connection between the redundant light-emitting element 1052 and the redundant pad 104 is abnormal, the low-voltage signal output by the low-voltage signal terminal PVEE is not output through the second redundant pad 104, and the detection terminal of the detection transistor M8 does not receive the low-voltage signal.

[0051] Optional, Figure 8 A schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention is shown in FIG. Figure 8 As shown, the detection transistor M8 is a single-gate transistor or a double-gate transistor. Figure 6 As shown, the detection transistor M8 can be a single-gate transistor, or further, as Figure 8 As shown, the detection transistor M8 can be a dual-gate transistor, which has better control performance, higher response speed and lower leakage current than a single-gate transistor, thereby improving detection stability and accuracy.

[0052] Optional, Figure 9 A schematic structural diagram of another pixel driving circuit provided by an embodiment of the present invention is shown in FIG. Figure 9 As shown, the data signal terminal DATA is multiplexed as a detection terminal of the driver chip 108. During the operation of the detection circuit 107, the data signal terminal DATA is multiplexed as the detection terminal of the driver chip 108 for detecting the signal output by the detection circuit 107. The first electrode of the detection transistor M8 in the detection circuit 107 is electrically connected to the second redundant sub-pad 12, and the second electrode of the detection transistor M8 is electrically connected to the data signal terminal DATA. After the detection transistor M8 is turned on, the data signal terminal DATA receives the low-voltage signal output via the second redundant pad 104, thereby saving ports on the driver chip 108, reducing circuit wiring, and lowering manufacturing difficulty and cost.

[0053] Optional, Figure 10 A structural diagram of another display panel provided by an embodiment of the present invention is shown in FIG. Figure 10 As shown, the display panel further includes a black material layer 109 , which covers between adjacent light emitting elements 105 , the main pads 103 where abnormalities exist, and the redundant pads 104 of the unrepaired redundant light emitting elements 1052 .

[0054] Among them, after the detection circuit 107 detects that the connection status between the redundant light-emitting element 1052 and the redundant solder pad 104 is normal, the position of the normally luminous main light-emitting element 1051 and the position of the normally luminous redundant light-emitting element 1052 that has been repaired are blocked, and the inkjet printing process is used to cover the main solder pad 103 with abnormalities between adjacent light-emitting elements 105 and the redundant solder pad 104 of the unrepaired redundant light-emitting element 1052 with a black material layer 109 to ensure spraying efficiency, improve contrast, and ensure display uniformity.

[0055] Based on the same inventive concept, an embodiment of the present invention further provides a method for detecting a display panel, which is used to prepare the display panel described in any one of the above embodiments. Figure 11 A flow chart of a method for detecting a display panel provided by an embodiment of the present invention is shown as follows: Figure 11 As shown, the display panel detection method includes:

[0056] S101, providing a display panel to be inspected.

[0057] S102: Obtain the position of the abnormal main pad in the display panel to be detected.

[0058] The display panel to be inspected is illuminated to obtain the position of the dark spot on the display, thereby determining the position of the abnormal main light-emitting element and main soldering pad.

[0059] S103: Determine the redundant pad position according to the main pad position.

[0060] The main pad position and the redundant pad position are set in a one-to-one correspondence, and the redundant pad position is determined according to the main pad position where an abnormality exists, thereby facilitating the setting of a redundant light-emitting element at the redundant pad position.

[0061] S104, repairing the redundant light-emitting element according to the position of the redundant pad.

[0062] The redundant light-emitting element is moved according to the position of the redundant pad, and the redundant light-emitting element is connected to the redundant pad, thereby preliminarily completing the repair of the redundant light-emitting element.

[0063] S105, controlling the detection circuit to be turned on, and obtaining the connectivity status between the redundant light-emitting element and the redundant pad.

[0064] After the redundant light-emitting element is repaired, the detection circuit is turned on. If the detection circuit can receive the low-voltage signal output by the redundant pad, it is considered that the connection between the redundant light-emitting element and the redundant pad is normal; if the detection circuit cannot receive the low-voltage signal output by the redundant pad, it is considered that the connection between the redundant light-emitting element and the redundant pad is abnormal.

[0065] The embodiment of the present invention obtains the position of the main pad with an abnormality in the display panel to be detected, determines the position of the redundant pad based on the position of the main pad, repairs the redundant light-emitting element based on the position of the redundant pad, controls the conduction of the detection circuit, obtains the connectivity status between the redundant light-emitting element and the redundant pad, determines the repair effect of the redundant light-emitting element through the detection circuit, avoids abnormal connectivity between the redundant pad and the redundant light-emitting element, and avoids affecting the overall display effect of the display panel, thereby effectively improving product yield and reducing costs.

[0066] Figure 12 A flow chart of another display panel detection method provided by an embodiment of the present invention is shown as follows: Figure 12 As shown, the redundant pad includes a first redundant sub-pad and a second redundant sub-pad; the detection method of the display panel includes:

[0067] S201, providing a display panel to be inspected.

[0068] S202: Obtain the position of the abnormal main pad in the display panel to be detected.

[0069] S203: Determine the redundant pad position according to the main pad position.

[0070] S204, repairing the redundant light-emitting element according to the position of the redundant pad.

[0071] S205, controlling the detection circuit to conduct, and determining whether a low voltage signal is obtained; if so, executing step S206; if not, executing step S207.

[0072] S206 , the redundant light emitting element and the redundant pad are in a connected state, and the cathode of the redundant light emitting element is electrically connected to the first redundant sub-pad and the second redundant sub-pad respectively.

[0073] S207, the redundant light emitting element and the redundant pad are in a disconnected state.

[0074] Among them, when the detection circuit is turned on, if the detection circuit obtains a low-voltage signal output by the redundant pad, and the first redundant sub-pad and the second redundant sub-pad in the redundant pad are electrically connected via the cathode of the redundant light-emitting element, then it is considered that the connection between the redundant light-emitting element and the redundant pad is normal; if the detection circuit fails to obtain the low-voltage signal output by the redundant pad, it is considered that the cathode of the redundant light-emitting element is not connected to the first redundant sub-pad or the second redundant sub-pad at the same time, and then it is considered that the connection between the redundant light-emitting element and the redundant pad is abnormal.

[0075] The embodiment of the present invention controls the conduction of the detection circuit and determines the connectivity status between the redundant light-emitting element and the redundant pad based on whether a low-voltage signal is obtained, so as to determine the repair effect of the current redundant light-emitting element, avoid abnormal connectivity between the redundant pad and the redundant light-emitting element, and affect the overall display effect of the display panel, thereby effectively improving product yield and reducing costs.

[0076] Figure 13 A flow chart of another display panel detection method provided by an embodiment of the present invention is shown as follows: Figure 13 As shown, the display panel detection method includes:

[0077] S301: Provide a display panel to be inspected.

[0078] S302: Obtain the position of the abnormal main pad in the display panel to be detected.

[0079] S303: Determine the redundant pad position according to the main pad position.

[0080] S304, repairing the redundant light-emitting element according to the position of the redundant pad.

[0081] S305, controlling the detection circuit to conduct, and determining whether a low voltage signal is obtained; if so, executing step S306; if not, executing step S308.

[0082] S306 , the redundant light emitting element and the redundant pad are in a connected state, and the cathode of the redundant light emitting element is electrically connected to the first redundant sub-pad and the second redundant sub-pad respectively.

[0083] S307 , using an inkjet printing process to prepare a black material layer between adjacent light-emitting elements, at the main pads where the abnormality exists, and at the redundant pads of the unrepaired redundant light-emitting elements.

[0084] Among them, after completing the repair of the redundant light-emitting elements and the detection circuit inspection, the connectivity between the redundant light-emitting elements and the redundant pads is normal, and the overall display in the display panel is normal. The driving chip can block the normally emitting main light-emitting elements and the normally emitting redundant light-emitting elements for the position coordinates and the position coordinates of the repaired normally emitting main light-emitting elements, and the normally emitting main light-emitting elements and redundant light-emitting elements. The inkjet printing process is used to prepare a black material layer between adjacent light-emitting elements, at the main pads with abnormalities, and at the redundant pads of the unrepaired redundant light-emitting elements to ensure the display uniformity of the display panel, improve the contrast, and ensure the display effect of the display panel.

[0085] S308, the redundant light emitting element and the redundant pad are in a disconnected state.

[0086] In the embodiment of the present invention, after the detection circuit detects that the connection status between the redundant light-emitting element and the redundant pad is normal, the position of the normally emitting main light-emitting element and the position of the normally emitting redundant light-emitting element that has been repaired are blocked, and a black material layer is used to cover between adjacent light-emitting elements, the main pads with abnormalities, and the redundant pads of the unrepaired redundant light-emitting elements using an inkjet printing process to ensure spraying efficiency, improve contrast, and ensure display uniformity.

[0087] Figure 14 A schematic structural diagram of a display device provided by an embodiment of the present invention is shown in FIG. Figure 14 As shown, the display device 200 includes the display panel 201 described in the above embodiment.

[0088] It should be noted that since the display device provided in this embodiment has the same or corresponding beneficial effects as the display panel of the above embodiment, no further description is given here. The display device 200 provided in this embodiment of the present invention can be Figure 14 The mobile phone shown can also be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc. The embodiments of the present invention do not specifically limit this.

[0089] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A display panel, characterized in that: The display panel includes: substrate; A circuit layer is located on one side of the substrate; the circuit layer includes a plurality of binding pads, and the binding pads include a main pad and a redundant pad; a light-emitting element located on a side of the circuit layer away from the base substrate, the light-emitting element including a main light-emitting element and a redundant light-emitting element, the main solder pad being used to connect the main light-emitting element, and the redundant solder pad being used for connection to the redundant light-emitting element when the main solder pad is abnormal; The circuit layer further includes a plurality of pixel driving circuits and a plurality of detection circuits, wherein the pixel driving circuits are electrically connected to the binding pads, and the detection circuits are electrically connected to some of the redundant pads; The detection circuit is configured to detect a connection state between the redundant light emitting element and the redundant pad after the redundant pad repairs the redundant light emitting element.

2. The display panel according to claim 1, wherein: The redundant pads at least include a redundant negative pad, the redundant negative pad includes a first redundant sub-pad and a second redundant sub-pad, and the first redundant sub-pad and the second redundant sub-pad are spaced apart. The first redundant sub-pad is electrically connected to the low voltage signal terminal, and the second redundant sub-pad is electrically connected to the detection circuit.

3. The display panel according to claim 2, wherein: An area of the first redundant sub-pad is greater than or equal to an area of the second redundant sub-pad.

4. The display panel according to claim 2, wherein: The display panel also includes a driving chip, and the detection circuit includes a detection transistor, a first electrode of the detection transistor is electrically connected to the second redundant sub-pad, a second electrode of the detection transistor is electrically connected to the detection end of the driving chip, and a gate of the detection transistor is electrically connected to the first scan signal end.

5. The display panel according to claim 4, wherein: The detection transistor is a single-gate transistor or a double-gate transistor.

6. The display panel according to claim 4, wherein: The pixel driving circuit includes: an initialization unit, a data writing unit, a threshold compensation unit, a light emitting control unit, a storage capacitor, a reset unit and a driving transistor; The initialization unit is electrically connected between the first initialization signal terminal and the first node; the initialization unit is used to provide the initialization signal of the initialization signal terminal to the first node during the initialization phase; The data writing unit is electrically connected between the data signal terminal and the first electrode of the driving transistor; the gate of the driving transistor and the first end of the storage capacitor are electrically connected to the first node; the second end of the storage capacitor is electrically connected to the power signal terminal; the threshold compensation unit is electrically connected between the second electrode of the driving transistor and the first node; the data writing unit is used to provide the data voltage signal of the data signal terminal to the first node during the data writing phase; the threshold compensation unit is used to compensate the threshold voltage of the driving transistor to the first node; The reset unit is electrically connected between the second initialization signal terminal and the first terminal of the light-emitting element; the second terminal of the light-emitting element is electrically connected to the low voltage signal terminal; the reset unit is used to provide the initialization signal of the second initialization signal terminal to the first terminal of the light-emitting element before the light-emitting phase; The light emitting control unit is electrically connected between the power signal terminal and the light emitting element; the light emitting control unit is used to control the driving current generated by the driving transistor to flow into the light emitting element during the light emitting stage, so as to drive the light emitting element to emit light.

7. The display panel according to claim 6, wherein: The data signal terminal is multiplexed as the detection terminal of the driver chip.

8. The display panel according to claim 1, wherein: The display panel further includes a black material layer, which covers between adjacent light emitting elements, the main pads where abnormalities exist, and the redundant pads where the redundant light emitting elements are not repaired.

9. A method for detecting a display panel, characterized in that: A display panel comprising any one of claims 1 to 8, wherein the method for detecting the display panel comprises: Providing a display panel to be tested; Obtaining a position of a main pad having an abnormality in the display panel to be detected; Determine the redundant pad position according to the main pad position; repairing the redundant light-emitting element according to the position of the redundant pad; The detection circuit is controlled to be turned on to obtain a connection state between the redundant light-emitting element and the redundant pad.

10. The display panel detection method according to claim 9, wherein: The redundant pad includes a first redundant sub-pad and a second redundant sub-pad; Obtaining a connectivity status between the redundant light-emitting element and the redundant pad includes: Determine whether a low voltage signal is obtained; If a low voltage signal is obtained, the redundant light emitting element and the redundant pad are in a connected state, and the cathode of the redundant light emitting element is electrically connected to the first redundant sub-pad and the second redundant sub-pad respectively; If the low voltage signal is not obtained, the redundant light emitting element and the redundant pad are in a disconnected state.

11. The display panel detection method according to claim 10, wherein: After the redundant light emitting element and the redundant pad are in a connected state, the method further includes: An inkjet printing process is used to prepare a black material layer between adjacent light-emitting elements, at the main pads where abnormalities exist, and at the redundant pads where the redundant light-emitting elements are not repaired.

12. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 8.

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