Display substrate, repairing method and manufacturing method thereof, and display device

Abstract

A display substrate, a repairing method and a manufacturing method thereof, and a display device. The display substrate comprises a plurality of pixels (02), a second power line (V2) and a repair line (RL) on one side of a substrate (01). The second power line (V2) is coupled with the repair line (RL), and the repair line (RL) is configured to couple the second power line (V2) with a first electrode of a light emitting element (022) in a defective pixel (02), so that the second power line (V2) transmits a second power signal to the first electrode of the light emitting element (022). The potential of the second power signal is greater than the potential of a first power signal provided by a first power line (V1) coupled with a second electrode of the light emitting element (022). The potential of the second power signal can be flexibly set, so that when a foreign matter causes the first electrode and the second electrode of the light emitting element (022) in the defective pixel (02) to be short-circuited and a dark spot appears, the foreign matter can be burned out, so that the first electrode and the second electrode of the light emitting element (022) are no longer short-circuited, thereby solving the problem of dark spot defects.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display substrate, its repair method, its preparation method, and its display device. Background Technology

[0002] Organic light-emitting diode (OLED) display substrates are widely used in various display devices due to their advantages such as self-illumination, wide viewing angle, fast response speed, low power consumption and high contrast.

[0003] Currently, OLED display substrates generally include a substrate and multiple pixels located on one side of the substrate. Each pixel includes pixel circuitry and a light-emitting element, with the light-emitting element comprising an anode and a cathode stacked sequentially. The pixel circuitry is coupled to the anode of the light-emitting element and configured to transmit a light-emitting drive signal to the anode. The cathode of the light-emitting element is coupled to a power line and configured to emit light under the voltage difference between the light-emitting drive signal received at the anode and the power signal supplied from the power line to the cathode.

[0004] However, research has found that if foreign objects fall between the anode and cathode of the light-emitting element during the fabrication of the OLED display substrate, it can easily cause a short circuit between the anode and cathode of the light-emitting element, resulting in the light-emitting element being unable to emit light normally. This leads to dark spots on the OLED display substrate and poor display performance. Summary of the Invention

[0005] This disclosure provides a display substrate, its repair method, its manufacturing method, and a display device, which can solve the problem of poor display effect of display substrates in related technologies. The technical solution is as follows:

[0006] On one hand, a display substrate is provided, the display substrate comprising:

[0007] Substrate;

[0008] A plurality of pixels are located on one side of the substrate. Each pixel includes a pixel circuit and a light-emitting element. The pixel circuit is coupled to a first electrode of the light-emitting element, and a second electrode of the light-emitting element is coupled to a first power line. The pixel circuit is configured to transmit a driving signal to the first electrode of the light-emitting element, and the light-emitting element is configured to emit light based on the driving signal and a first power signal provided by the first power line.

[0009] In addition, at least one second power line and multiple repair lines are located on one side of the substrate, the second power line is coupled to the repair lines, the orthographic projection of the repair lines on the substrate overlaps with the orthographic projection of the first electrode of the light-emitting element on the substrate, the repair lines are configured to couple the second power line to the first electrode of the light-emitting element included in the bad pixel among the plurality of pixels, and the second power line is configured to transmit a second power signal to the first electrode of the coupled light-emitting element via the repair lines;

[0010] The bad pixel includes a dark pixel, and the potential of the second power signal is greater than the potential of the first power signal.

[0011] Optionally, the potential of the first power signal is 0, and the potential of the second power signal is greater than or equal to 6 volts and less than or equal to 12 volts.

[0012] Optionally, the plurality of pixels have at least two colors, and at least two pixels of the same color share the same repair line;

[0013] The repair line is further configured to couple the first electrode of the light-emitting element included in the bad pixel to the first electrode of the light-emitting element included in the normal pixel, wherein the normal pixel and the bad pixel share the same repair line and have the same color, and the bad pixel includes a bright pixel.

[0014] Furthermore, when the repair line couples the first electrode of the light-emitting element included in the bad pixel to the first electrode of the light-emitting element included in the normal pixel, the first electrode of the light-emitting element included in the bad pixel is disconnected from the pixel circuit included in the bad pixel, and the first electrode of the light-emitting element included in the bad pixel is disconnected from the second power line.

[0015] Optionally, the plurality of pixel arrays are arranged such that the normal pixel and the bad pixel are two adjacent pixels located in the same column.

[0016] Optionally, the first electrode of the light-emitting element is the anode, and the second electrode of the light-emitting element is the cathode.

[0017] Optionally, the first electrode of the light-emitting element has a first portion and a second portion that are spaced apart.

[0018] Optionally, the pixel circuit includes: a data writing sub-circuit, a sensing sub-circuit, an adjustment sub-circuit, and a driving sub-circuit;

[0019] The data writing sub-circuit is coupled to the first gate line, the data line and the control terminal of the driving sub-circuit respectively. The data writing sub-circuit is configured to control the connection and disconnection of the control terminal of the driving sub-circuit and the data line in response to the first gate driving signal provided by the first gate line.

[0020] The sensing sub-circuit is coupled to the second gate line, the sensing line and the output terminal of the driving sub-circuit respectively. The sensing sub-circuit is configured to control the on / off state of the output terminal of the driving sub-circuit and the sensing line in response to the second gate driving signal provided by the second gate line.

[0021] The regulating sub-circuit is coupled to the control terminal and the output terminal of the driving sub-circuit, respectively, and the regulating sub-circuit is configured to regulate the potential of the control terminal and the output terminal of the driving sub-circuit.

[0022] The input terminal of the driving sub-circuit is coupled to the driving power line, and the output terminal of the driving sub-circuit is also coupled to the first electrode of the light-emitting element. The driving sub-circuit is configured to transmit a driving signal to the first electrode of the light-emitting element based on the driving power signal provided by the driving power line and the signal of the control terminal.

[0023] The second power line is the sensing line.

[0024] Optionally, the data writing sub-circuit includes a first transistor; the sensing sub-circuit includes a second transistor; the adjustment sub-circuit includes a storage capacitor; and the driving sub-circuit includes a third transistor.

[0025] The gate of the first transistor is coupled to the first gate line, the first electrode of the first transistor is coupled to the data line, and the second electrode of the first transistor is coupled to the gate of the third transistor.

[0026] The gate of the second transistor is coupled to the second gate line, the first terminal of the second transistor is coupled to the sensing line, and the second terminal of the second transistor is coupled to the second terminal of the third transistor;

[0027] One end of the storage capacitor is coupled to the gate of the third transistor, and the other end of the storage capacitor is coupled to the second terminal of the third transistor.

[0028] The first terminal of the third transistor is coupled to the driving power line, and the second terminal of the third transistor is also coupled to the first terminal of the light-emitting element.

[0029] Optionally, the second power line and the repair line are located on different layers, and the display substrate further includes:

[0030] An insulating layer is located between the second power line and the repair line, and a via is formed through the insulating layer, through which the second power line and the repair line overlap.

[0031] Optionally, the pixel circuit includes: an active layer, a gate insulating layer, a gate metal layer, an interlayer stabilizing layer, and a source / drain metal layer sequentially stacked along a direction away from the substrate; the display substrate further includes: a light-shielding layer located between the substrate and the active layer;

[0032] The second power line is located in the same layer as the source / drain metal layer, and the repair line is located in the same layer as the light-shielding layer.

[0033] On the other hand, a method for repairing a display substrate is provided, for repairing a display substrate as described above, the method comprising:

[0034] When multiple pixels in the display substrate have bad pixels, and the bad pixels are dark pixels, the second power line is coupled to the first electrode of the light-emitting element in the bad pixel through the repair line.

[0035] A second power signal is provided to the first electrode of the light-emitting element in the bad pixel through the second power line;

[0036] Wherein, the potential of the second power signal is greater than the potential of the first power signal provided by the first power line coupled to the second electrode of the light-emitting element.

[0037] Optionally, the method further includes:

[0038] If a foreign object with a fused fuse is found at the defective pixel, the second power line is disconnected from the first electrode of the light-emitting element in the defective pixel.

[0039] If no foreign matter after melting is displayed at the defective pixel or the defective pixel is a bright pixel, then the first electrode of the light-emitting element in the defective pixel is disconnected from the pixel circuit in the defective pixel, the first electrode of the light-emitting element in the defective pixel is disconnected from the second power line, and the first electrode of the light-emitting element in the defective pixel is coupled to the first electrode of the light-emitting element in the normal pixel through the repair line; wherein, the normal pixel and the defective pixel share the same repair line and have the same color.

[0040] Optionally, the step of coupling the second power line to the first electrode of the light-emitting element in the bad pixel via the repair line includes:

[0041] The repair line is welded to the first electrode of the light-emitting element in the bad pixel using a laser welding process, so that the second power line is coupled to the first electrode of the light-emitting element in the bad pixel via the repair line.

[0042] The step of coupling the first electrode of the light-emitting element in the bad pixel to the first electrode of the light-emitting element in the normal pixel through the repair line includes:

[0043] The repair line is welded to the first electrode of the light-emitting element in the bad pixel and the first electrode of the light-emitting element in the normal pixel using a laser welding process, so that the first electrode of the light-emitting element in the bad pixel is coupled to the first electrode of the light-emitting element in the normal pixel.

[0044] The step of disconnecting the second power line from the first electrode of the light-emitting element in the bad pixel includes:

[0045] By using a laser cutting process, the repair line is coupled to the first electrode of the light-emitting element in the bad pixel, so as to disconnect the second power line from the first electrode of the light-emitting element in the bad pixel.

[0046] The step of disconnecting the first electrode of the light-emitting element in the bad pixel from the pixel circuit in the bad pixel includes:

[0047] The first electrode of the light-emitting element in the defective pixel is disconnected from the pixel circuit by laser cutting.

[0048] In another aspect, a method for fabricating a display substrate is provided, for fabricating a display substrate as described above, the method comprising:

[0049] Provide substrate;

[0050] Multiple pixels are formed on one side of the substrate. Each pixel includes a pixel circuit and a light-emitting element. The pixel circuit is coupled to a first electrode of the light-emitting element, and a second electrode of the light-emitting element is coupled to a first power line. The pixel circuit is configured to transmit a driving signal to the first electrode of the light-emitting element, and the light-emitting element is configured to emit light based on the driving signal and a first power signal provided by the first power line.

[0051] In addition, at least one second power line and multiple repair lines are formed on one side of the substrate, and the second power line is coupled to the repair lines. The orthographic projection of the repair line on the substrate overlaps with the orthographic projection of the first electrode of the light-emitting element on the substrate. The repair lines are configured to couple the second power line to the first electrode of the light-emitting element included in the bad pixel among the plurality of pixels. The second power line is configured to transmit a second power signal to the first electrode of the coupled light-emitting element via the repair lines.

[0052] The bad pixel includes a dark pixel, and the potential of the second power signal is greater than the potential of the first power signal.

[0053] In another aspect, a display device is provided, the display device comprising: a power supply component, and a display substrate as described above;

[0054] The power supply component is coupled to the display substrate and configured to supply power to the display substrate.

[0055] In summary, the beneficial effects of the technical solutions provided by the embodiments of this disclosure can at least include:

[0056] A display substrate and its repair method, fabrication method, and display device are provided. The display substrate includes a plurality of pixels located on one side of a substrate, a second power line, and a repair line. The second power line is coupled to the repair line, and the repair line can be configured to couple the second power line to the first electrode of a light-emitting element in a defective pixel, so that the second power line transmits a second power signal to the first electrode of the light-emitting element. Furthermore, the potential of the second power signal is greater than the potential of the first power signal provided by the first power line coupled to the second electrode of the light-emitting element. Thus, by flexibly setting the potential of the second power signal, when a foreign object causes a short circuit between the first and second electrodes of the light-emitting element in a defective pixel, resulting in a dark spot, the foreign object can be reliably burned off, preventing the short circuit between the first and second electrodes of the light-emitting element and resolving the dark spot problem. The display substrate provided by this embodiment has good display performance. Attached Figure Description

[0057] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a schematic diagram of the structure of a display substrate provided in an embodiment of this disclosure;

[0059] Figure 2 This is an equivalent schematic diagram of a partial structure in a display substrate provided in an embodiment of the present disclosure;

[0060] Figure 3 This is a schematic diagram of a pixel circuit provided in an embodiment of the present disclosure;

[0061] Figure 4 This is a schematic diagram of another pixel circuit structure provided in an embodiment of this disclosure;

[0062] Figure 5 This is an equivalent schematic diagram of a partial structure in another display substrate provided in this embodiment;

[0063] Figure 6 This is an equivalent schematic diagram of a partial structure in another display substrate provided in this embodiment;

[0064] Figure 7This is an equivalent diagram for repairing a display substrate provided in an embodiment of this disclosure;

[0065] Figure 8 This is another equivalent diagram for repairing a display substrate provided in this embodiment of the disclosure;

[0066] Figure 9 This is a schematic diagram of the film layers of a display substrate provided in an embodiment of this disclosure;

[0067] Figure 10 This is a flowchart of a repair method for a display substrate provided in an embodiment of this disclosure;

[0068] Figure 11 This is a flowchart of another method for repairing a display substrate provided in this embodiment of the present disclosure;

[0069] Figure 12 This is a flowchart of a method for preparing a display substrate according to an embodiment of the present disclosure;

[0070] Figure 13 This is a schematic diagram of the structure of a display device provided in an embodiment of this disclosure. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0072] Research has revealed that in addition to the dark spot defects described in the background technology, pixels can also exhibit bright spot defects. Dark spot defects refer to pixels that cannot be lit normally and emit light; pixels exhibiting this defect are also called dark spot pixels. Bright spot defects refer to pixels that can be lit normally but with abnormal brightness (generally manifested as excessive brightness); pixels exhibiting this defect are also called bright spot pixels. Both dark spot and bright spot pixels are considered bad pixels; conversely, pixels that can be lit normally and have normal brightness are considered normal pixels. Causes of dark spot defects include foreign objects causing short circuits between the anode and cathode of the light-emitting element, as well as malfunctions in components (such as transistors or capacitors) within the pixel circuitry. Causes of bright spot defects typically include malfunctions in components within the pixel circuitry, such as transistor threshold voltage drift.

[0073] Currently, when a pixel exhibits a dark spot defect, the problem is usually determined by observation to whether it is caused by a foreign object or a malfunction in the pixel circuitry. If it is determined to be caused by a foreign object, the portion of the anode at the location of the foreign object can be cut off. This method is commonly used in display products where an anode is split in two. When a foreign object is present, one half of the pixel can be cut off, and the pixel emits light normally under the pressure difference between the other half and the cathode, thus allowing half a pixel to emit light. Display products with a split anode are generally transparent displays that simultaneously display and transmit light. Because the light transmission function is achieved by sacrificing resolution, transparent displays generally have lower resolution and larger pixel spacing, making dark spot defects more noticeable. Therefore, designing the anode to be split in two can improve dark spot defects. If the dark spot defect is determined to be caused by a malfunction in the pixel circuitry, it cannot be repaired. When a pixel exhibits a bright spot defect, the entire anode is usually cut off, causing the pixel to stop emitting light, thus repairing a bright spot to a dark spot. In this disclosure, each pixel refers to a sub-pixel.

[0074] The above processing methods have the following problems: First, for transparent display products, even after repairing to half-pixel illumination, the macroscopic display effect remains poor due to the product's low resolution and large transparent area. Second, because foreign objects are generally very small, they are difficult to observe even with a microscope, making it impossible to distinguish the cause of the dark spot defect, thus hindering repair. Furthermore, even if it can be determined that the dark spot defect is caused by a foreign object, its location cannot be reliably determined, making it impossible to determine which part of the anode to cut, still resulting in the inability to repair. Tests show that currently, about 40% of dark spot defects cannot find the foreign object. Third, dark spots caused by abnormalities in the pixel circuit components are difficult to detect, especially those appearing in top-emitting display products with reflective cathodes and light-shielding layers. Tests show that currently, about 90% of dark spots cannot be observed under a microscope. Fourth, the emitting area of ​​half-pixel is smaller than that of the entire pixel, but the potential of the driving signal provided to part of the anode is the same as the potential of the driving signal provided to the entire anode. This results in a high current density. After lighting up half a pixel for an extended period, the difference in brightness between it and the surrounding normal pixels will become increasingly significant, easily leading to reliability failure and reverting to a dark spot. Fifth, dark spots and bright spots caused by malfunctions in the pixel circuitry cannot actually be repaired to normal.

[0075] Therefore, this disclosure provides a new display substrate and a method for repairing defects, which reliably improves dark spot defects and bright spot defects by solving the above-mentioned problems.

[0076] Figure 1 This is a schematic diagram of the structure of a display substrate provided in an embodiment of this disclosure. For example... Figure 1As shown, the display substrate includes:

[0077] Substrate 01.

[0078] Multiple pixels 02 located on one side of substrate 01.

[0079] Each pixel 02 includes a pixel circuit 021 and a light-emitting element 022. The pixel circuit 021 is coupled (i.e., electrically connected) to the first electrode of the light-emitting element 022, and the second electrode of the light-emitting element 022 is coupled to a first power supply line V1. The pixel circuit 021 is configured to transmit a driving signal (e.g., a driving current) to the first electrode of the light-emitting element 022, and the light-emitting element 022 is configured to emit light based on the driving signal received at the first electrode and a first power supply signal provided by the first power supply line V1. For example, the light-emitting element 022 can emit light under the voltage difference between the driving signal and the first power supply signal.

[0080] Optionally, in the first and second electrodes of the light-emitting element 022, one electrode is the anode and the other is the cathode. For example, Figure 1 The first electrode shown is the anode, and the second electrode is the cathode.

[0081] exist Figure 1 Based on this, refer to Figure 2 As shown in the schematic diagram of another display substrate, the display substrate described in this embodiment further includes at least one second power line V2 and multiple repair lines RL located on one side of the substrate 01. The second power line V2 is coupled to the repair lines RL. The orthographic projection of the repair line RL on the substrate 01 overlaps with the orthographic projection of the first electrode of the light-emitting element 022 on the substrate 01.

[0082] It should be noted that, Figure 2 Only the first electrode of the light-emitting element 022 is shown, only one second power line V2 is shown, and the pixel circuit 02 is not shown.

[0083] Based on the above configuration, the repair line RL of this embodiment can be configured to couple the second power line V2 to the first electrode of the light-emitting element 022, which includes the bad pixel in the plurality of pixels 02. The second power line V2 can be configured to transmit a second power signal to the first electrode of the coupled light-emitting element 022 via the repair line RL.

[0084] The defective pixel can include a dark pixel, and the potential of the second power signal can be greater than the potential of the first power signal. For example, the potential of the first power signal can be less than or equal to 0, and the potential of the second power signal can be greater than 0. Therefore, when a dark pixel is caused by a foreign object, after coupling the second power line V2 to the first electrode of the light-emitting element 022, the potential of the second power signal provided by the second power line V2 can be flexibly set to burn off the foreign object trapped between the first and second electrodes of the light-emitting element, i.e., to melt the foreign object. After the foreign object is melted, the first and second electrodes of the light-emitting element are no longer short-circuited, the light-emitting element can be lit normally, the dark pixel disappears, and the problem of the dark pixel defect is solved.

[0085] Example, combination Figure 2 In this embodiment, if no dark pixel appears, the repair line RL only overlaps with the first electrode of the light-emitting element 022 without coupling. If a dark pixel appears, further connection processes can be used to couple the repair line RL to the first electrode of the light-emitting element 022, thereby indirectly coupling the second power line V2 to the first electrode of the light-emitting element 022 to solve the dark pixel defect problem. For example, the connection process may include laser welding. Correspondingly, coupling the repair line RL to the first electrode of the light-emitting element 022 can also be referred to as welding the repair line RL to the first electrode of the light-emitting element 022, thereby ensuring coupling reliability.

[0086] Optional, combined Figure 2 It can also be seen that the pixel circuit 021 and the first electrode of the light-emitting element 022 can be coupled through the first adapter via K1. The repair line RL and the first electrode of the light-emitting element 022 can be coupled through the second adapter via K2. Accordingly, the overlap of the orthographic projection of the repair line RL on the substrate 01 and the orthographic projection of the first electrode of the light-emitting element 022 on the substrate 01 can mean that the orthographic projection of the repair line RL on the substrate 01 overlaps with the orthographic projection of the second adapter via K2 on the substrate. Welding the repair line RL to the first electrode of the light-emitting element 022 can mean that welding is performed at the second adapter via K2. Furthermore, when the first electrode is the anode, both the first adapter via K1 and the second adapter via K2 can be called anode vias. The first adapter via K1 and the second adapter via K2 can be alternately arranged or can be the same via.

[0087] Thus, in this embodiment, the problem of dark spot defects is solved by setting a repair line RL to extend the second power line V2 to the side of the anode of the light-emitting element 022, and by expanding the area of ​​the anode via to the repair line RL. Therefore, the repair line RL can also be referred to as a branch of the second power line V2.

[0088] In summary, this disclosure provides a display substrate. The display substrate includes a plurality of pixels located on one side of a substrate, a second power line, and a repair line. The second power line is coupled to the repair line, and the repair line can be configured to couple the second power line to the first electrode of a light-emitting element in a defective pixel, so that the second power line transmits a second power signal to the first electrode of the light-emitting element. Furthermore, the potential of the second power signal is greater than the potential of the first power signal provided by the first power line coupled to the second electrode of the light-emitting element. Thus, by flexibly setting the potential of the second power signal, when a foreign object causes a short circuit between the first and second electrodes of the light-emitting element in a defective pixel, resulting in a dark spot, the foreign object can be reliably burned off, preventing the short circuit between the first and second electrodes of the light-emitting element from resolving the dark spot problem. This results in a better display effect for the display substrate.

[0089] Optionally, in this embodiment, the potential of the first power signal can be 0. The potential of the second power signal can be greater than or equal to 6 volts (V) and less than or equal to 12V, such as typically 10V. This ensures reliable melting of foreign matter and resolution of dark spot defects when they are caused by foreign objects.

[0090] Optionally, in embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the first electrode of the light-emitting element 022 can be an anode, and the second electrode of the light-emitting element 022 can be a cathode.

[0091] Optional, Figure 3 This is a schematic diagram of a pixel circuit provided in an embodiment of this disclosure. Figure 3 As shown, the pixel circuit 021 described in this embodiment may include: a data writing sub-circuit 0211, a sensing sub-circuit 0212, an adjustment sub-circuit 0213, and a driving sub-circuit 0214.

[0092] The data writing sub-circuit 0211 can be coupled to the first gate line G1, the data line Data, and the control terminal of the drive sub-circuit 0214, respectively. Furthermore, the data writing sub-circuit 0211 can be configured to control the connection and disconnection of the control terminal of the drive sub-circuit 0214 and the data line Data in response to the first gate drive signal provided by the first gate line G1.

[0093] For example, the data writing sub-circuit 0211 can control the control terminal of the driving sub-circuit 0214 to conduct with the data line Data when the potential of the first gate drive signal provided by the first gate line G1 is a first potential. At this time, the data line Data can transmit a data signal to the control terminal of the driving sub-circuit 0214 to charge the control terminal of the driving sub-circuit 0214. Furthermore, the data writing sub-circuit 0211 can control the control terminal of the driving sub-circuit 0214 to disconnect from the data line Data when the potential of the first gate drive signal provided by the first gate line G1 is a second potential.

[0094] Optionally, in this embodiment of the disclosure, the first potential can be an effective potential, the second potential can be an ineffective potential, and the first potential can be a higher potential relative to the second potential.

[0095] The sensing sub-circuit 0212 can be coupled to the second gate line G2, the sensing line Sense, and the output of the driving sub-circuit 0214, respectively. Furthermore, the sensing sub-circuit 0212 can be configured to control the on / off state of the output of the driving sub-circuit 0214 and the sensing line Sense in response to the second gate drive signal provided by the second gate line G2.

[0096] For example, when the potential of the second gate drive signal is the first potential, the sensing sub-circuit 0212 can control the output terminal of the driving sub-circuit 0214 to be connected to the sensing line Sense. At this time, the sensing line Sense can transmit a sensing signal to the output terminal of the driving sub-circuit 0214 to reset the output terminal of the driving sub-circuit 0214; or, the sensing line Sense can receive the potential at the output terminal of the driving sub-circuit 0214. Furthermore, the sensing line Sense can also be coupled to an external compensation circuit and transmit the received potential to the external compensation circuit so that the external compensation circuit can perform external compensation on the data signal according to the potential, ensuring reliable illumination of the light-emitting element 022. Additionally, when the potential of the second gate drive signal is the second potential, the sensing sub-circuit 0212 can control the output terminal of the driving sub-circuit 0214 to be disconnected from the sensing line Sense.

[0097] The regulating sub-circuit 0213 can be coupled to the control terminal and the output terminal of the driving sub-circuit 0214, respectively. Furthermore, the regulating sub-circuit 0213 can be configured to regulate the potentials of the control terminal and the output terminal of the driving sub-circuit 0214.

[0098] The input terminal of the driver sub-circuit 0214 can be coupled to the driver power line VDD, and the output terminal of the driver sub-circuit 0214 can also be coupled to the first electrode of the light-emitting element 022. Furthermore, the driver sub-circuit 0214 can be configured to transmit a drive signal to the first electrode of the light-emitting element 022 based on the drive power signal provided by the driver power line VDD and the signal from the control terminal.

[0099] Based on the above structure, the second power line V2 described in this embodiment can be a sensing line Sense. That is, the pixel circuit 02 can also be coupled to the second power line V2 to transmit a driving signal to the light-emitting element 022 based on the second power signal provided by the second power line V2. Alternatively, in some other embodiments, the second power line V2 can also be a driving power line VDD; or other signal lines capable of providing the potential of the aforementioned second power signal, and the pixel circuit 02 and the second power line V2 may not be coupled. The following embodiments are all described using the second power line V2 as a sensing line Sense as an example.

[0100] It should be noted that both the sensing line Sense and the driving power line VDD, serving as the second power line V2, are DC power lines, meaning they provide DC signals. Furthermore, based on the operating principle of the sensing sub-circuit 0212, when pixel 02 is normally lit, the potential of the sensing signal provided by the sensing line Sense is generally low, approximately 0V or below. Therefore, in this embodiment, in addition to the sensing line Sense serving as the second power line V2, a larger potential of approximately 10V needs to be applied to the sensing line Sense when repairing dark spot defects. Optionally, the circuit applying this large potential to the sensing line Sense can be the external compensation circuit mentioned in the above embodiment, or it can be other external driving circuits.

[0101] Optional, Figure 4 This is a schematic diagram of another pixel circuit structure provided in an embodiment of this disclosure. For example... Figure 4 As shown, the data writing sub-circuit 0211 may include: a first transistor T1. The sensing sub-circuit 0212 may include: a second transistor T2. The adjustment sub-circuit 0213 may include: a storage capacitor C1. The driving sub-circuit 0214 may include: a third transistor T3.

[0102] The gate of the first transistor T1 can be coupled to the first gate line G1, the first electrode of the first transistor T1 can be coupled to the data line Data, and the second electrode of the first transistor T1 can be coupled to the gate of the third transistor T3.

[0103] The gate of the second transistor T2 can be coupled to the second gate line G2, the first terminal of the second transistor T2 can be coupled to the sensing line Sense, and the second terminal of the second transistor T2 can be coupled to the second terminal of the third transistor T3.

[0104] One end of the storage capacitor C1 can be coupled to the gate of the third transistor T3, and the other end of the storage capacitor C1 can be coupled to the second terminal of the third transistor T3.

[0105] The first terminal of the third transistor T3 can be coupled to the drive power line VDD, and the second terminal of the third transistor T3 can also be coupled to the first terminal of the light-emitting element 022.

[0106] The first transistor T1 can also be called the data write transistor. The second transistor T2 can also be called the sensing transistor. The third transistor T3 can also be called the driving transistor. (Combined...) Figure 3 and Figure 4 It can be seen that the control terminal of the driving sub-circuit 0214 is the gate of the driving transistor, the input terminal of the driving sub-circuit 0214 is the first pole of the driving transistor, and the output terminal of the driving sub-circuit 0214 is the second pole of the driving transistor.

[0107] Based on the current-limiting function of the transistor, when repairing dark spot defects, the second power supply signal with a larger potential applied to the sensing line Sense can directly bypass the second transistor T2 (i.e., the sensing transistor) and reach the anode of the light-emitting element 022, thereby reliably burning off foreign objects. The signal flow direction is shown in [the diagram]. Figure 4 As indicated by the dashed arrow, experiments have verified that although the current limiting of the sensing transistor is relatively small and a small current cannot burn off foreign objects, the success rate of burning off foreign objects can reach 100% after the sensing transistor is connected across the surface.

[0108] Optionally, in each of the above transistors, one of the first and second terminals can be the source and the other can be the drain. This embodiment is described with the first terminal as the source and the second terminal as the drain. The first transistor T1, the second transistor T2, and the third transistor T3 can all be N-type transistors, or all be P-type transistors, or a combination of both.

[0109] For an N-type transistor, the effective potential (i.e., the first potential) can be higher than the ineffective potential (i.e., the second potential). For a P-type transistor, the effective potential (i.e., the first potential) can be lower than the ineffective potential (i.e., the second potential).

[0110] It should be noted that, Figure 4 The structure shown can be called a 3T1C structure, which includes 3 transistors and 1 capacitor. Of course, in some other embodiments, provided that the above embodiments are satisfied, the pixel circuit 021 can also have other structures, such as a 6T2C structure including 6 transistors and 2 capacitors. Furthermore, the pixel circuit 021 is not limited to only including… Figure 3 and Figure 4 The sub-circuits shown may also include other sub-circuits, such as a light-emitting control sub-circuit. This disclosure does not limit the scope of the embodiments.

[0111] Optionally, in this embodiment of the disclosure, the first electrode of the light-emitting element 022 may consist of only a portion, belonging to a single unit. Alternatively, refer to... Figure 5 In another display substrate shown, the first electrode of the light-emitting element 022 may have a first portion Anode1 and a second portion Anode2 spaced apart. That is, as described in the above embodiments, the anode of the light-emitting element 022 can be partitioned into two parts. In this way, if only one part fails to emit light normally, it may not affect the overall anode of the light-emitting element 022. The following embodiments are all described using the example of the first electrode of the light-emitting element 022 including the first portion Anode1 and the second portion Anode2.

[0112] Optional, combined Figure 1 Given that multiple pixels 02 are arranged in row and column arrays, the first electrode of the light-emitting element 022, including a first part Anode1 and a second part Anode2, can be arranged at intervals along the column direction. Of course, in some other embodiments, the first part Anode1 and the second part Anode2 can also be arranged at intervals along other directions, such as the row direction. This disclosure does not limit the arrangement method.

[0113] Optionally, the plurality of pixels 02 provided in this embodiment of the disclosure may have at least two colors, and at least two pixels 02 of the same color may share the same repair line RL. Combined with Figure 2 The sharing of a single repair line RL here can mean that the first pole of the light-emitting element 022 in at least two pixels 02 of the same color overlaps with the same repair line RL. That is, they are coupled to the second power line V2 via the same repair line RL.

[0114] For example, refer to Figure 6 The multiple pixels 02 shown include three colors: red (R), green (G), and blue (B). That is, the display substrate may include multiple red pixels, multiple green pixels, and multiple blue pixels.

[0115] as well as, Figure 6 The diagram shows that every two adjacent pixels 02 of the same color share the same repair line RL. "Adjacent" here can refer to being adjacent in the column direction. Furthermore, each pixel 02 corresponds to only one repair line RL, meaning different repair lines RL are shared by different two pixels 02. This facilitates routing.

[0116] Based on the above coupling, the repair line RL described in this embodiment can also be configured to couple the first electrode of the light-emitting element 022 included in the bad pixel to the first electrode of the light-emitting element 022 included in the normal pixel 02. The normal pixel 02 and the bad pixel can share the same repair line RL and have the same color. For example, for Figure 6In the structure shown, a normal pixel 02 and a bad pixel can be two adjacent pixels 02 located in the same column. Here, bad pixels can include not only dark pixels but also bright pixels.

[0117] Furthermore, when the repair line RL couples the first electrode of the light-emitting element 022 included in the bad pixel to the first electrode of the light-emitting element 022 included in the normal pixel 02, the first electrode of the light-emitting element 022 included in the bad pixel and the pixel circuit 021 included in the bad pixel can be disconnected, and the first electrode of the light-emitting element 022 included in the bad pixel and the second power line V2 can be disconnected.

[0118] For example, a laser welding process can be used to weld the repair line RL to the first electrode of the light-emitting element 022 included in the defective pixel and the first electrode of the light-emitting element 022 included in the normal pixel 02, so as to reliably couple the first electrode of the light-emitting element 022 included in the defective pixel to the first electrode of the light-emitting element 022 included in the normal pixel 02 through the repair line RL. Some cutting processes can be used to disconnect the first electrode of the light-emitting element 022 included in the defective pixel from the pixel circuit 021 and the second power line V2 included in the defective pixel, respectively. For example, a laser cutting process can be used to cut the first electrode of the light-emitting element 022 included in the defective pixel from the pixel circuit 021 and the second power line V2 included in the defective pixel, respectively, to disconnect the coupling. Optionally, the coupling between the pixel circuit 021 and the second power line V2 can be disconnected by cutting the repair line RL.

[0119] As can be seen from the above embodiments, the reasons for the appearance of bright pixel patterns include: Figure 4 The transistor or capacitor in the pixel circuit 021 shown is malfunctioning. The appearance of dark pixels can also be caused by transistor or capacitor malfunctions.

[0120] Thus, when a transistor or capacitor malfunction causes a dark spot or a bright spot, by disconnecting the pixel circuit 021 in the bad pixel from the light-emitting element 022, and using a repair line RL to couple the first electrode of the light-emitting element 022 in the bad pixel to the first electrode of the light-emitting element 022 in the normal pixel, the pixel circuit 021 coupled to the first electrode of the light-emitting element 022 in the normal pixel can transmit a driving signal to the first electrode of the light-emitting element 022 in the bad pixel, thereby reliably driving the bad pixel to emit light normally and solving the display problem.

[0121] It should be noted that the prerequisite for disconnecting the first electrode of the light-emitting element 022 and the second power line V2 of the defective pixel is that the first electrode of the light-emitting element 022 and the second power line V2 of the defective pixel were previously coupled through the repair line RL. That is, the defective pixel is a dark pixel. If the defective pixel itself is a bright pixel, then it is not necessary to first couple the second power line V2 to the first electrode of the light-emitting element 022 through the repair line RL. Therefore, it is also not necessary to disconnect the first electrode of the light-emitting element 022 from the second power line V2.

[0122] As can be seen from the above embodiments, in this disclosed embodiment, if a dark pixel appears, the repair line RL coupled to the second power line V2 can be welded to the first electrode of the light-emitting element 022 in the dark pixel using a laser welding process. A second power signal with a larger potential is then provided to the first electrode of the light-emitting element 022 through the second power line V2. Since the dark pixel defect is caused by a foreign object, the foreign object will be melted and exposed, thus revealing the defect. Therefore, by observing whether molten foreign object is exposed, it can be reliably determined whether the dark pixel defect is caused by a foreign object or by a transistor or capacitor malfunction. Furthermore, even if the foreign object is too small to be observed under a microscope, this method can burn off the foreign object to expose it.

[0123] Furthermore, if foreign matter is detected, indicating that the dark spot defect is caused by foreign matter, the melted foreign matter will prevent the first and second electrodes of the light-emitting element 022 from short-circuiting, and the dark spot pixel will return to a normal pixel. Afterwards, the second power line V2 can be disconnected from the first electrode of the light-emitting element 022 using a laser cutting process, so that the second power line V2 no longer transmits the second power signal to the first electrode of the light-emitting element 022. The first electrode of the light-emitting element 022 then receives the driving signal provided by the pixel circuit 021 again and emits light normally. If no foreign objects are observed, the first electrode of the light-emitting element 022 in the dark pixel can be disconnected from the pixel circuit 021 and the second power line V2 using a laser cutting process. Then, the repair line RL can be welded to the first electrode of the light-emitting element 022 in both the dark pixel and the normal pixel using a laser welding process. This couples the first electrode of the light-emitting element 022 in the dark pixel to the first electrode of the light-emitting element 022 in the normal pixel, allowing the pixel circuit of the normal pixel to transmit a driving signal to the first electrode of the light-emitting element 022 in the dark pixel, thus driving the dark pixel to emit light normally. This solves the dark pixel defect problem.

[0124] If the bright spot defect is caused by a transistor or capacitor malfunction, the first electrode of the light-emitting element 022 in the dark pixel can be disconnected from the pixel circuit 021 using a laser cutting process. Then, a repair line RL can be welded to the first electrode of the light-emitting element 022 in both the dark pixel and the normal pixel using a laser welding process. This couples the first electrode of the light-emitting element 022 in the dark pixel to the first electrode of the light-emitting element 022 in the normal pixel, allowing the pixel circuit of the normal pixel to transmit a driving signal to the first electrode of the light-emitting element 022 in the dark pixel, thus driving the bright spot pixel to emit light normally. This solves the bright spot defect problem.

[0125] For example, in Figure 6 Based on this, taking the example of a dark spot defect appearing on a green G pixel caused by a foreign object, refer to... Figure 7 The equivalent process diagram further illustrates the repair method: First, using laser welding, the repair line RL is welded to the anode of the green G pixel at the second adapter via K2 corresponding to the anode (including G-Anode1 and G-Anode2). Then, a potential of approximately 10V is applied to the second power line V2 (i.e., the sensing line Sense) to burn off the foreign object, ensuring the anode and cathode of the green G pixel are no longer short-circuited. Finally, using laser cutting, the repair line RL is cut to disconnect the coupling between the second power line V2 and the anode of the green G pixel, allowing the pixel circuit 021 to reliably drive the green G pixel to emit light. Thus, the dark pixel is repaired to a normal pixel.

[0126] For example, in Figure 6 Based on this, taking a transistor or capacitor malfunction causing a dark spot defect in a green G pixel as an example, refer to... Figure 8 The process equivalent diagram further illustrates the repair method: First, the repair line RL is cut using a laser cutting process to disconnect the coupling between the second power line V2 and the anode of the dark green G pixel. Then, the coupling between the anode of the dark green G pixel and the pixel circuit 021 within the dark green G pixel is disconnected using a laser cutting process. Finally, using a laser welding process, the repair line RL is welded to the anode of the dark green G pixel and the anode of the normal green G pixel (which shares the repair line RL with the dark green G pixel) at the second adapter via K2 corresponding to the anode of the dark green G pixel, and at the second adapter via K2 corresponding to the anode of the normal green G pixel, thus coupling the anode of the dark green G pixel to the anode of the normal green G pixel. Consequently, the pixel circuit 021 of the normal green G pixel can transmit a driving signal to the dark green G pixel to drive it to emit light normally. Thus, the dark pixel is repaired to a normal pixel. Furthermore, in conjunction with the above embodiments, Figure 8 Example method is in Figure 7In the example, the procedure was performed after a large potential was applied to the second power line V2 and the foreign object did not manifest.

[0127] It should be noted that, Figure 8 The cutting and welding sequence shown above can be flexibly adjusted according to the situation. The cutting and welding positions can also be flexibly set to ensure that the above coupling and disconnection methods are met.

[0128] As described in the above embodiments, this disclosure embodiment, by simply adding a repair line RL, can reliably repair dark spot and bright spot defects without affecting the aperture ratio, ensuring that all defective pixels can be reliably repaired. When applied to transparent display products, it can significantly improve product yield. Of course, the repair method provided by this disclosure embodiment is not only applicable to the top-emitting display products and transparent display products described in the above embodiments, but can also be applied to bottom-emitting display products or non-transparent display products.

[0129] Optionally, the second power line V2 and the repair line RL described in this embodiment can be located on different layers, i.e., stacked and arranged in a direction away from the substrate. Thus, combined with... Figure 6 and Figure 9 The display substrate may further include an insulating layer located between the second power line V2 and the repair line RL, and a via K0 penetrating the insulating layer. The second power line V2 and the repair line RL can be connected through the via K0. Of course, in some other embodiments, the second power line V2 and the repair line RL may also be located on the same layer.

[0130] Optional, continue to refer to Figure 9 As can be seen, the pixel circuit 021 may include: an active layer P1, a gate insulator (GI) layer, a gate metal layer GT, an inter-layer di-electric (ILD) layer, and a source & drain (SD) metal layer, which are stacked sequentially along the direction away from the substrate 01. Figure 9 The image shows the driving transistor in pixel circuit 021, namely the third transistor T3.

[0131] Optionally, the anode can be located on the side of the source / drain metal layer SD away from the substrate 01. The active layer P1, gate insulating layer GI, gate metal layer GT, interlayer stabilizing layer ILD, and source / drain metal layer SD can be stacked sequentially in a direction away from the substrate 01. That is, each transistor in the pixel circuit 021 can be a top-gate transistor. Of course, in some other embodiments, the transistor can also be a bottom-gate transistor.

[0132] Optionally, the display substrate may further include a light shield (LS) layer located between the substrate 01 and the active layer P1. The second power line V2 described in this embodiment may be located in the same layer as the source / drain metal layer SD, and the repair line RL may be located in the same layer as the light shield layer LS.

[0133] It should be noted that "being in the same layer" can refer to a layer structure formed by using the same film deposition process to create a specific pattern, and then using the same photomask to pattern this film layer in a single patterning process. Depending on the specific pattern, the single patterning process may include multiple exposure, development, or etching processes, and the specific pattern in the resulting layer structure can be continuous or discontinuous. That is, multiple components, parts, structures, and / or portions located in the "same layer" are made of the same material and formed through the same single patterning process. This can save on manufacturing processes and costs, and can accelerate manufacturing efficiency. For example, the second power line V2 and the source / drain metal layer SD can be made of the same material and formed through a single patterning process. Similarly, the repair line RL and the light-shielding layer LS can be made of the same material and formed through a single patterning process.

[0134] Furthermore, combined Figure 9 It can be seen that the display substrate may further include: a buffer layer located between the active layer P1 and the light-shielding layer LS, and a passivation (PVX) layer and a planarization (PLN) layer stacked sequentially between the source / drain metal layers SD and the anode. The source / drain metal layers SD may include source electrodes S1 and drain electrodes D1 located on the same layer and spaced apart from each other. Thus, the insulating layer located between the repair line RL and the light-shielding layer LS may include an interlayer stabilizing layer ILD and a buffer layer. The second power line V2 may be connected to the repair line RL via a via K0 that penetrates the interlayer stabilizing layer ILD and the buffer layer.

[0135] Of course, in some other embodiments, the repair line RL may also be located in the same layer as other conductive layers. For example, the repair line RL may be located in the same layer as the gate metal layer. The second power line V2 may also be located in the same layer as other conductive layers. For example, the second power line V2 may be located in the same layer as the gate metal layer.

[0136] Figure 9The diagram also shows a cathode and an emitting layer EL, which are located on the side of the anode away from the substrate 01 and stacked sequentially in a direction away from the substrate 01. The source S1 can be connected to the light-shielding layer LS through a via penetrating the interlayer stabilizing layer ILD and the buffer layer Buffer, ensuring that the voltage on the light-shielding layer LS is the same as that on the source S1 and the anode, thus preventing parasitic capacitance between the light-shielding layer LS and other conductive structures. Furthermore, the orthographic projection of the active layer P1 onto the substrate 01 overlaps with the orthographic projection of the light-shielding layer LS onto the substrate 01. The light-shielding layer LS can be used to shield the active layer P1, preventing voltage threshold shift under light illumination, and can also be used for light shielding to prevent external light interference with the display. The source S1 and drain D1 can be connected to the active layer P1 through two vias penetrating the interlayer stabilizing layer ILD, respectively. Additionally, the source S1 can also be connected to the anode through a via penetrating the passivation layer PVX and the planarization layer PLN. In this way, a driving signal can be transmitted from the source S1 to the anode. This driving signal and the first power supply signal applied to the cathode Cathode can form a voltage difference, causing the light-emitting layer EL to emit light.

[0137] Optionally, the active layer P1 may have a semiconductor region (also called a channel region) and conductor regions located on both sides of the channel region (referred to as source and drain regions, respectively, corresponding to the source and drain). The semiconductor region may be undoped, or the doping type may differ from that of the source and drain regions, thus exhibiting semiconductor characteristics. The conductor region may be doped, thus exhibiting conductivity. The dopant may vary depending on the transistor type (i.e., N-type or P-type). The aforementioned source / drain metal layer SD may overlap with the conductor region.

[0138] Optionally, substrate 01 may include a glass substrate or a flexible substrate, and the material of the flexible substrate may include polyimide. The materials of the buffer layer, passivation layer PVX, and gate insulating layer GI may include inorganic materials such as silicon nitride, silicon oxide, or silicon oxynitride. The material of the interlayer stabilizing layer ILD may include silicon dioxide, silicon nitride, or a mixture of silicon dioxide and silicon nitride. The material of the planarization layer PLN may include resin. The material of the light-emitting layer EL may include organic electroluminescence (EL) materials. The material of the cathode Anode may include indium tin oxide (ITO). The material of the cathode Cathode may include indium zinc oxide (IZO). The materials of the light-shielding layer LS, gate metal layer GT, and source / drain metal layer SD may include metallic materials such as aluminum, silver, molybdenum, or alloys. The material of the active layer P1 may include semiconductor materials such as polycrystalline silicon, amorphous silicon, or oxide semiconductors.

[0139] In summary, this disclosure provides a display substrate. The display substrate includes a plurality of pixels located on one side of a substrate, a second power line, and a repair line. The second power line is coupled to the repair line, and the repair line can be configured to couple the second power line to the first electrode of a light-emitting element in a defective pixel, so that the second power line transmits a second power signal to the first electrode of the light-emitting element. Furthermore, the potential of the second power signal is greater than the potential of the first power signal provided by the first power line coupled to the second electrode of the light-emitting element. Thus, by flexibly setting the potential of the second power signal, when a foreign object causes a short circuit between the first and second electrodes of the light-emitting element in a defective pixel, resulting in a dark spot, the foreign object can be reliably burned off, preventing the short circuit between the first and second electrodes of the light-emitting element from resolving the dark spot problem. This results in a better display effect for the display substrate.

[0140] Figure 10 This disclosure provides a method for repairing a display substrate, which can be used to repair display substrates as shown in the accompanying drawings. Figure 10 As shown, the method includes:

[0141] Step 1001: When multiple pixels in the display substrate have bad pixels, and the bad pixels are dark pixels, the second power line is coupled to the first pole of the light-emitting element in the bad pixel through the repair line.

[0142] Optional, combined Figure 7 As described in the above embodiments, the repair line RL can be welded to the first electrode of the light-emitting element 022 in the bad pixel using a laser welding process, so that the second power line V2 is coupled to the first electrode of the light-emitting element 022 in the bad pixel via the repair line RL.

[0143] Step 1002: Provide a second power signal to the first electrode of the light-emitting element in the bad pixel through the second power line.

[0144] The potential of the second power supply signal can be greater than the potential of the first power supply signal provided by the first power supply line coupled to the second electrode of the light-emitting element. This allows for reliable burning out of foreign objects that cause dark spots, preventing a short circuit between the first and second electrodes of the light-emitting element and resolving the dark spot problem.

[0145] Figure 11 This is another method for repairing a display substrate provided in this embodiment. Combined with... Figure 10 and Figure 11 It can be seen that after step 1002, the method may further include:

[0146] Step 1003: If a foreign object with a broken fuse is displayed at the bad pixel, disconnect the second power line from the first electrode of the light-emitting element in the bad pixel.

[0147] As described in the above embodiments, if a foreign object that has been fused is displayed at the defective pixel, it can be determined that the cause of the dark spot defect is that the foreign object caused a short circuit between the first and second electrodes of the light-emitting element. In this case, after burning out the foreign object, the second power line can be disconnected from the first electrode of the light-emitting element in the defective pixel, so that the second power line no longer transmits a high-potential second power signal to the first electrode of the light-emitting element. The pixel circuit 021 then resumes providing a normal driving signal to the first electrode of the light-emitting element to drive the light-emitting element to emit light reliably.

[0148] Optional, combined Figure 7 As described in the above embodiments, the repair line RL can be cut by laser cutting process to disconnect the second power line V2 from the first pole of the light-emitting element 022 in the bad pixel.

[0149] Step 1004: If no foreign object after melting is displayed at the bad pixel or the bad pixel is a bright pixel, then disconnect the first electrode of the light-emitting element in the bad pixel from the pixel circuit in the bad pixel, disconnect the first electrode of the light-emitting element in the bad pixel from the second power line, and connect the first electrode of the light-emitting element in the bad pixel to the first electrode of the light-emitting element in the normal pixel through the repair line.

[0150] As described in the above embodiments, if no foreign matter is displayed at the defective pixel, it can be determined that the cause of the dark spot defect is a transistor or capacitor malfunction. In this case, the first electrode of the light-emitting element in the defective pixel can be disconnected from the pixel circuit in the defective pixel, and the first electrode of the light-emitting element in the defective pixel can be disconnected from the second power line. Then, the first electrode of the light-emitting element in the defective pixel can be coupled to the first electrode of the light-emitting element in the normal pixel through a repair line, so that the pixel circuit in the normal pixel provides a driving signal to the light-emitting element in the defective pixel to drive the light-emitting element in the defective pixel to reliably emit light. The normal pixel and the defective pixel share the same repair line and are of the same color. Of course, if the defect is a bright spot, step 1004 can be executed directly without executing steps 1001 to 1003.

[0151] Optional, combined Figure 8 As described in the above embodiments, a laser welding process can be used to weld the repair line RL to the first electrode of the light-emitting element 022 in the defective pixel and the first electrode of the light-emitting element 022 in the normal pixel, respectively, so that the first electrode of the light-emitting element 022 in the defective pixel is coupled to the first electrode of the light-emitting element 022 in the normal pixel. Furthermore, a laser cutting process can be used to disconnect the first electrode of the light-emitting element 022 in the defective pixel from the pixel circuit 021 in the defective pixel and from the second power line V2.

[0152] In summary, this disclosure provides a method for repairing a display substrate. In this method, if a defective pixel appears, and the defective pixel is a dark pixel, a second power line is coupled to the first electrode of the light-emitting element in the defective pixel via a repair line in the display substrate, and a second power signal is provided to the first electrode of the light-emitting element in the defective pixel via the second power line. Furthermore, the potential of this second power signal is greater than the potential of the first power signal provided by the first power line coupled to the second electrode of the light-emitting element. Thus, by flexibly setting the potential of the second power signal, when a foreign object causes a short circuit between the first and second electrodes of the light-emitting element in the defective pixel, resulting in a dark spot, the foreign object can be reliably burned off, preventing the short circuit between the first and second electrodes of the light-emitting element and resolving the dark spot problem. The display substrate provided by this disclosure has a better display effect.

[0153] Furthermore, in this method, if a foreign object appears when the second power signal is supplied to the first electrode of the light-emitting element in the defective pixel via the second power line, the second power line can be further disconnected from the first electrode of the light-emitting element in the defective pixel. This stops the second power line from supplying a high-potential second power signal to the defective pixel, ensuring normal subsequent light emission of the pixel. If no foreign object appears, the first electrode of the light-emitting element in the defective pixel can be further disconnected from the pixel circuit in the defective pixel, and the first electrode of the light-emitting element in the defective pixel can be disconnected from the second power line. Then, the first electrode of the light-emitting element in the defective pixel can be coupled to the first electrode of the light-emitting element in the normal pixel via a repair line. In this way, defects caused by abnormal transistors or capacitors in the pixel circuit can also be reliably resolved.

[0154] Figure 12 This is a flowchart illustrating a method for fabricating a display substrate according to an embodiment of this disclosure. This method can be used to fabricate a display substrate as shown in the above figures. Figure 12 As shown, the method includes:

[0155] Step 1201: Provide a substrate.

[0156] Optionally, as described in the above embodiments, the provided substrate 01 can be a glass substrate or a flexible substrate.

[0157] Step 1202: Form multiple pixels on one side of the substrate.

[0158] The pixel includes a pixel circuit and a light-emitting element. The pixel circuit is coupled to a first electrode of the light-emitting element, and the second electrode of the light-emitting element is coupled to a first power line. The pixel circuit is configured to transmit a drive signal to the first electrode of the light-emitting element, and the light-emitting element is configured to emit light based on the drive signal and a first power signal provided by the first power line.

[0159] Optional, combined Figure 9 A single patterning process can be used to form an active layer, a gate insulating layer, a gate metal layer, and a source / drain metal layer on one side of a substrate to form a pixel circuit; and to form an anode, a light-emitting layer, and a cathode on another side of the substrate to form a light-emitting element. The patterning process includes steps such as photoresist coating, exposure, development, etching, and photoresist stripping.

[0160] Step 1203: Form at least one second power line and multiple repair lines on one side of the substrate, and couple the second power line to the repair lines.

[0161] In this configuration, the orthographic projection of the repair line onto the substrate overlaps with the orthographic projection of the first electrode of the light-emitting element onto the substrate. Furthermore, the repair line can be configured to couple a second power line to the first electrode of the light-emitting element included in a defective pixel among a plurality of pixels. The second power line can be configured to transmit a second power signal to the first electrode of the coupled light-emitting element via the repair line. The defective pixel may include a dark pixel, and the potential of the second power signal may be greater than the potential of the first power signal.

[0162] Furthermore, the repair line can also be configured to couple the first electrode of the light-emitting element included in the bad pixel to the first electrode of the light-emitting element included in the normal pixel, wherein the normal pixel and the bad pixel share the same repair line and are of the same color, and the bad pixel may include a bright pixel. Moreover, when the repair line couples the first electrode of the light-emitting element included in the bad pixel to the first electrode of the light-emitting element included in the normal pixel, the first electrode of the light-emitting element included in the bad pixel is disconnected from the pixel circuit included in the bad pixel, and the first electrode of the light-emitting element included in the bad pixel is disconnected from the second power line.

[0163] Optional, combined Figure 9 A single patterning process can be used to form the repair line RL while forming the light-shielding layer LS; and to form the second power line V2 while forming the source / drain metal layer SD; and to connect the second power line V2 of different layers with the repair line RL through the via K0 that penetrates the interlayer mediating layer ILD and the buffer layer Buffer.

[0164] In summary, this disclosure provides a method for fabricating a display substrate. In this method, multiple pixels, a second power line, and a repair line can be formed on one side of the substrate, and the second power line is coupled to the repair line. The formed repair line can be configured to couple the second power line to the first electrode of the light-emitting element in the defective pixel, so that the second power line transmits a second power signal to the first electrode of the light-emitting element. Furthermore, the potential of this second power signal is greater than the potential of the first power signal provided by the first power line coupled to the second electrode of the light-emitting element. Thus, by flexibly setting the potential of the second power signal, when a foreign object causes a short circuit between the first and second electrodes of the light-emitting element in the defective pixel, resulting in a dark spot, the foreign object can be reliably burned off, preventing the short circuit between the first and second electrodes of the light-emitting element from resolving the dark spot problem. The display substrate provided by this disclosure has a better display effect.

[0165] Figure 13 This is a display device provided in an embodiment of the present disclosure. For example... Figure 13 As shown, the display device may include: a power supply component J1, and a display substrate 00 as shown in the above figures.

[0166] The power supply component J1 can be coupled to the display substrate 00 and is configured to supply power to the display substrate 00.

[0167] Optionally, the display device can be any product or component with display functionality, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, or transparent display product. Transparent display products can be used for in-vehicle displays in cars or subways, and for window displays in hotels or clothing stores, offering advantages such as clear image quality and realistic display effects.

[0168] It should be noted that the dimensions of layers and regions may be exaggerated in the accompanying drawings for clarity. Furthermore, it is understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be intermediate layers. Additionally, it is understood that when an element or layer is referred to as being "below" another element or layer, it can be directly below the other element, or there may be more than one intermediate layer or element. Furthermore, it is understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Similar reference numerals throughout indicate similar elements.

[0169] Furthermore, the terminology used in the embodiments of this disclosure is for the purpose of explaining the embodiments of this disclosure only and is not intended to limit this disclosure. Unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should be understood in their ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains.

[0170] For example, in embodiments of this disclosure, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0171] Similarly, words like "one" or "one" do not indicate a quantity limit, but rather that there is at least one.

[0172] The word “includes” or similar terms means that the elements or objects preceding “includes” or “include” cover the elements or objects listed after “includes” or “include” or their equivalents, and do not exclude other elements or objects.

[0173] "Up," "down," "left," or "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0174] The "and / or" signifies that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0175] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A display substrate, characterized in that, The display substrate includes: Substrate; A plurality of pixels are located on one side of the substrate. Each pixel includes a pixel circuit and a light-emitting element. The pixel circuit is coupled to a first electrode of the light-emitting element, and a second electrode of the light-emitting element is coupled to a first power line. The pixel circuit is configured to transmit a driving signal to the first electrode of the light-emitting element, and the light-emitting element is configured to emit light based on the driving signal and a first power signal provided by the first power line. The substrate includes at least one second power line and multiple repair lines located on one side. The second power line is coupled to the repair lines. The orthographic projection of the repair line on the substrate overlaps with the orthographic projection of the first electrode of the light-emitting element on the substrate. The repair lines are configured to couple the second power line to the first electrode of the light-emitting element included in the defective pixel among the plurality of pixels. The second power line is configured to transmit a second power signal to the first electrode of the coupled light-emitting element via the repair lines. The defective pixel includes a dark pixel. The potential of the second power signal is greater than the potential of the first power signal. The plurality of pixels have at least two colors, and at least two pixels of the same color share the same repair line; the repair line is further configured to couple the first electrode of the light-emitting element included in the bad pixel to the first electrode of the light-emitting element included in the normal pixel, the normal pixel and the bad pixel share the same repair line and are the same color, and the bad pixel includes a bright pixel; Furthermore, when the repair line couples the first electrode of the light-emitting element included in the bad pixel to the first electrode of the light-emitting element included in the normal pixel, the first electrode of the light-emitting element included in the bad pixel is disconnected from the pixel circuit included in the bad pixel, and the first electrode of the light-emitting element included in the bad pixel is disconnected from the second power line.

2. The display substrate according to claim 1, characterized in that, The potential of the first power signal is 0, and the potential of the second power signal is greater than or equal to 6 volts and less than or equal to 12 volts.

3. The display substrate according to claim 1, characterized in that, The multiple pixel arrays are arranged such that the normal pixel and the bad pixel are two adjacent pixels located in the same column.

4. The display substrate according to any one of claims 1 to 3, characterized in that, The first electrode of the light-emitting element is the anode, and the second electrode of the light-emitting element is the cathode.

5. The display substrate according to any one of claims 1 to 3, characterized in that, The first electrode of the light-emitting element has a first part and a second part that are spaced apart.

6. The display substrate according to any one of claims 1 to 3, characterized in that, The pixel circuit includes: a data writing sub-circuit, a sensing sub-circuit, an adjustment sub-circuit, and a driving sub-circuit; The data writing sub-circuit is coupled to the first gate line, the data line and the control terminal of the driving sub-circuit respectively. The data writing sub-circuit is configured to control the connection and disconnection of the control terminal of the driving sub-circuit and the data line in response to the first gate driving signal provided by the first gate line. The sensing sub-circuit is coupled to the second gate line, the sensing line and the output terminal of the driving sub-circuit respectively. The sensing sub-circuit is configured to control the on / off state of the output terminal of the driving sub-circuit and the sensing line in response to the second gate driving signal provided by the second gate line. The regulating sub-circuit is coupled to the control terminal and the output terminal of the driving sub-circuit, respectively, and the regulating sub-circuit is configured to regulate the potential of the control terminal and the output terminal of the driving sub-circuit. The input terminal of the driving sub-circuit is coupled to the driving power line, and the output terminal of the driving sub-circuit is also coupled to the first electrode of the light-emitting element. The driving sub-circuit is configured to transmit a driving signal to the first electrode of the light-emitting element based on the driving power signal provided by the driving power line and the signal of the control terminal. The second power line is the sensing line.

7. The display substrate according to claim 6, characterized in that, The data writing sub-circuit includes a first transistor; the sensing sub-circuit includes a second transistor; the adjustment sub-circuit includes a storage capacitor; and the driving sub-circuit includes a third transistor. The gate of the first transistor is coupled to the first gate line, the first electrode of the first transistor is coupled to the data line, and the second electrode of the first transistor is coupled to the gate of the third transistor. The gate of the second transistor is coupled to the second gate line, the first terminal of the second transistor is coupled to the sensing line, and the second terminal of the second transistor is coupled to the second terminal of the third transistor; One end of the storage capacitor is coupled to the gate of the third transistor, and the other end of the storage capacitor is coupled to the second terminal of the third transistor. The first terminal of the third transistor is coupled to the driving power line, and the second terminal of the third transistor is also coupled to the first terminal of the light-emitting element.

8. The display substrate according to any one of claims 1 to 3, characterized in that, The second power line and the repair line are located on different layers, and the display substrate further includes: An insulating layer is located between the second power line and the repair line, and a via is formed through the insulating layer, through which the second power line and the repair line overlap.

9. The display substrate according to claim 8, characterized in that, The pixel circuit includes: an active layer, a gate insulating layer, a gate metal layer, an interlayer stabilizing layer, and a source / drain metal layer, which are sequentially stacked along a direction away from the substrate; the display substrate further includes: a light-shielding layer located between the substrate and the active layer; The second power line is located in the same layer as the source / drain metal layer, and the repair line is located in the same layer as the light-shielding layer.

10. A method for repairing a display substrate, characterized in that, The method for repairing a display substrate as described in any one of claims 1 to 9 includes: When multiple pixels in the display substrate have bad pixels, and the bad pixels are dark pixels, the second power line is coupled to the first electrode of the light-emitting element in the bad pixel through the repair line. A second power signal is provided to the first electrode of the light-emitting element in the bad pixel through the second power line; Wherein, the potential of the second power signal is greater than the potential of the first power signal provided by the first power line coupled to the second electrode of the light-emitting element.

11. The method according to claim 10, characterized in that, The method further includes: If a foreign object with a fused fuse is found at the defective pixel, the second power line is disconnected from the first electrode of the light-emitting element in the defective pixel. If no foreign matter after melting is displayed at the defective pixel or the defective pixel is a bright pixel, then the first electrode of the light-emitting element in the defective pixel is disconnected from the pixel circuit in the defective pixel, the first electrode of the light-emitting element in the defective pixel is disconnected from the second power line, and the first electrode of the light-emitting element in the defective pixel is coupled to the first electrode of the light-emitting element in the normal pixel through the repair line; wherein, the normal pixel and the defective pixel share the same repair line and have the same color.

12. The method according to claim 11, characterized in that, The step of coupling the second power line to the first electrode of the light-emitting element in the bad pixel via the repair line includes: The repair line is welded to the first electrode of the light-emitting element in the bad pixel using a laser welding process, so that the second power line is coupled to the first electrode of the light-emitting element in the bad pixel via the repair line. The step of coupling the first electrode of the light-emitting element in the bad pixel to the first electrode of the light-emitting element in the normal pixel through the repair line includes: The repair line is welded to the first electrode of the light-emitting element in the bad pixel and the first electrode of the light-emitting element in the normal pixel using a laser welding process, so that the first electrode of the light-emitting element in the bad pixel is coupled to the first electrode of the light-emitting element in the normal pixel. The step of disconnecting the second power line from the first electrode of the light-emitting element in the bad pixel includes: By using a laser cutting process, the repair line is coupled to the first electrode of the light-emitting element in the bad pixel, so as to disconnect the second power line from the first electrode of the light-emitting element in the bad pixel. The step of disconnecting the first electrode of the light-emitting element in the bad pixel from the pixel circuit in the bad pixel includes: The first electrode of the light-emitting element in the defective pixel is disconnected from the pixel circuit in the defective pixel by laser cutting process.

13. A method for preparing a display substrate, characterized in that, The method for preparing a display substrate as described in any one of claims 1 to 9 includes: Provide substrate; Multiple pixels are formed on one side of the substrate. Each pixel includes a pixel circuit and a light-emitting element. The pixel circuit is coupled to a first electrode of the light-emitting element, and a second electrode of the light-emitting element is coupled to a first power line. The pixel circuit is configured to transmit a driving signal to the first electrode of the light-emitting element, and the light-emitting element is configured to emit light based on the driving signal and a first power signal provided by the first power line. In addition, at least one second power line and multiple repair lines are formed on one side of the substrate, and the second power line is coupled to the repair lines. The orthographic projection of the repair line on the substrate overlaps with the orthographic projection of the first electrode of the light-emitting element on the substrate. The repair lines are configured to couple the second power line to the first electrode of the light-emitting element included in the bad pixel among the plurality of pixels. The second power line is configured to transmit a second power signal to the first electrode of the coupled light-emitting element via the repair lines. The bad pixel includes a dark pixel, and the potential of the second power signal is greater than the potential of the first power signal.

14. A display device, characterized in that, The display device includes: a power supply component, and a display substrate as described in any one of claims 1 to 9; The power supply component is coupled to the display substrate and configured to supply power to the display substrate.

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