Pixel circuit, and display substrate and dark spot repair method therefor

Abstract

Provided are a pixel circuit, and a display substrate and a dark spot repair method therefor. Each pixel unit in a pixel circuit comprises at least two pixel light-emitting branches; in pixel light-emitting branches (A, B, C, D) of a same pixel unit, light-emitting elements of a same color are connected in parallel; and a first-type metal electrode (1021) is bridged with a first electrode (102) of a first color light-emitting element (R) of each of at least two pixel light-emitting branches (A, B, C, D), a second-type metal electrode (1041) is bridged with a first electrode (104) of a second color light-emitting element (B) of each of the at least two pixel light-emitting branches (A, B, C, D), and a third-type metal electrode (1061) is bridged with a first electrode (106) of a third color light-emitting element (G) of each of the at least two pixel light-emitting branches (A, B, C, D).

Description

Pixel circuit, display substrate and dark spot repairing method thereof

[0001] The present application claims priority to the Chinese patent application No. 202410467999.4, filed on April 18, 2024, and titled "Pixel circuit, display substrate and dark spot repairing method thereof", the content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] Embodiments of the present disclosure relate to, but are not limited to, the technical field of display, and in particular, to a pixel circuit, a display substrate and a dark spot repairing method thereof. BACKGROUND

[0003] An OLED (Organic Light-Emitting Diode) display substrate is an active light-emitting device, which has attracted more and more attention due to its advantages such as high contrast, wide viewing angle, low power consumption, thinness, etc.

[0004] The OLED display substrate generally adopts a hierarchical structure. An OLED light-emitting element for realizing a light-emitting function in the OLED display substrate generally includes an electroluminescent layer for emitting light of a specific color, and an anode layer and a cathode layer respectively arranged on both sides of the electroluminescent layer. When the voltage between the anode layer and the cathode layer is greater than the turn-on voltage of the light-emitting element, the electroluminescent layer in the light-emitting element will be excited to emit light.

[0005] In the preparation process of the OLED display substrate, residual conductive particles are easy to cause short circuit of the anode layer and the cathode layer of the OLED light-emitting element inside the display substrate, so that there is no voltage difference between the anode layer and the cathode layer, the electroluminescent layer cannot emit light, and a corresponding pixel structure appears a dark spot, which affects the product yield.

[0006] SUMMARY

[0007] The following is a summary of the subject matter of the detailed description herein. This summary is not intended to limit the scope of the claims.

[0008] Embodiments of the present disclosure provide a pixel circuit, a display substrate and a dark spot repairing method thereof.

[0009] In a first aspect, embodiments of the present disclosure provide a pixel circuit, comprising:

[0010] a plurality of pixel units, the pixel units comprising at least two pixel light-emitting branches;

[0011] The pixel light-emitting branch comprises at least two of a first color light-emitting element, a second color light-emitting element and a third color light-emitting element; in each pixel light-emitting branch of the same pixel unit, light-emitting elements of the same color are connected in parallel;

[0012] The pixel unit further comprises a first type of metal electrode, a second type of metal electrode and a third type of metal electrode, the first type of metal electrode is used for accessing the electrode voltage of the first color light-emitting element, the second type of metal electrode is used for accessing the electrode voltage of the second color light-emitting element, and the third type of metal electrode is used for accessing the electrode voltage of the third color light-emitting element;

[0013] The first type of metal electrode bridges the first electrode of the first color light-emitting element of at least two pixel light-emitting branches, the second type of metal electrode bridges the first electrode of the second color light-emitting element of at least two pixel light-emitting branches, and the third type of metal electrode bridges the first electrode of the third color light-emitting element of at least two pixel light-emitting branches.

[0014] Optionally, the pixel unit comprises two pixel light-emitting branches;

[0015] The first type of metal electrode bridges the first electrode of the first color light-emitting element of each pixel light-emitting branch in the two pixel light-emitting branches; the second type of metal electrode bridges the first electrode of the second color light-emitting element of each pixel light-emitting branch in the two pixel light-emitting branches; and the third type of metal electrode bridges the first electrode of the third color light-emitting element of each pixel light-emitting branch in the two pixel light-emitting branches.

[0016] Optionally, the pixel unit comprises three pixel light-emitting branches;

[0017] The first type of metal electrode bridges the first electrode of the first color light-emitting element of at least two pixel light-emitting branches in the three pixel light-emitting branches; the second type of metal electrode bridges the first electrode of the second color light-emitting element of at least two pixel light-emitting branches in the three pixel light-emitting branches; and the third type of metal electrode bridges the first electrode of the third color light-emitting element of at least two pixel light-emitting branches in the three pixel light-emitting branches.

[0018] Optionally, the pixel circuit comprises four pixel light-emitting branches;

[0019] The first electrodes of light-emitting elements of the same color in the four pixel light-emitting branches are connected to each other through metal traces;

[0020] The first type of metal electrode bridges the first electrode of the first color light emitting element of two of the four pixel light emitting branches; the second type of metal electrode bridges the first electrode of the second color light emitting element of two of the four pixel light emitting branches; and the third type of metal electrode bridges the first electrode of the third color light emitting element of two of the four pixel light emitting branches.

[0021] Optionally, the pixel circuit includes four pixel light emitting branches.

[0022] The first type of metal electrode bridges the first electrode of the first color light emitting element of each of the four pixel light emitting branches; the second type of metal electrode bridges the first electrode of the second color light emitting element of each of the four pixel light emitting branches; and the third type of metal electrode bridges the first electrode of the third color light emitting element of each of the four pixel light emitting branches.

[0023] Optionally, the four pixel light emitting branches include a first pixel light emitting branch, a second pixel light emitting branch, a third pixel light emitting branch, and a fourth pixel light emitting branch.

[0024] The pixel unit includes two first type of metal electrodes, one of which bridges the first electrode of the first color light emitting element in the first pixel light emitting branch and the second pixel light emitting branch, and the other of which bridges the first electrode of the first color light emitting element in the third pixel light emitting branch and the fourth pixel light emitting branch; the pixel unit includes two second type of metal electrodes, one of which bridges the first electrode of the second color light emitting element in the second pixel light emitting branch and the fourth pixel light emitting branch, and the other of which bridges the first electrode of the second color light emitting element in the first pixel light emitting branch and the third pixel light emitting branch; and the pixel unit includes two third type of metal electrodes, one of which bridges the first electrode of the third color light emitting element in the first pixel light emitting branch and the third pixel light emitting branch, and the other of which bridges the first electrode of the third color light emitting element in the second pixel light emitting branch and the fourth pixel light emitting branch.

[0025] Optionally, the first color light emitting element, the second color light emitting element, and the third color light emitting element in the same pixel light emitting branch are arranged in a stack.

[0026] In a second aspect, the embodiments of the present disclosure provide a display substrate, including: a substrate, and at least two pixel units arranged on the substrate.

[0027] The pixel unit comprises a first metal layer, a first electroluminescent layer, a second metal layer, a second electroluminescent layer, a third metal layer, a third electroluminescent layer, a fourth metal layer, and a pixel definition layer.

[0028] The first metal layer is arranged on the substrate, the first electroluminescent layer is arranged on the side of the first metal layer away from the substrate, the second metal layer is arranged on the side of the first electroluminescent layer away from the substrate, the second electroluminescent layer is arranged on the side of the second metal layer away from the substrate, the third metal layer is arranged on the side of the second electroluminescent layer away from the substrate, the third electroluminescent layer is arranged on the side of the third metal layer away from the substrate, and the fourth metal layer is arranged on the side of the third electroluminescent layer away from the substrate.

[0029] The pixel definition layer defines the first metal layer, the first electroluminescent layer, the second metal layer, the second electroluminescent layer, the third metal layer, the third electroluminescent layer, and the fourth metal layer as a plurality of pixel light-emitting branches. The pixel light-emitting branch comprises a first color light-emitting element, a second color light-emitting element, and a third color light-emitting element. In each pixel light-emitting branch of the same pixel unit, the light-emitting elements of the same color are connected in parallel.

[0030] The pixel unit further comprises a first type of metal electrode, a second type of metal electrode, and a third type of metal electrode. The first type of metal electrode bridges the first metal layer of at least two pixel light-emitting branches, the second type of metal electrode bridges the second metal layer of at least two pixel light-emitting branches, and the third type of metal electrode bridges the third metal layer of at least two pixel light-emitting branches.

[0031] Optionally, the pixel definition layer defines the first metal layer, the first electroluminescent layer, the second metal layer, the second electroluminescent layer, the third metal layer, the third electroluminescent layer, and the fourth metal layer as two pixel light-emitting branches. The first type of metal electrode is located in the first metal layer, the second type of metal electrode is located in the second metal layer, and the third type of metal electrode is located in the third metal layer.

[0032] The first type of metal electrode bridges the first metal layer of each pixel light-emitting branch in the two pixel light-emitting branches, the second type of metal electrode bridges the second metal layer of each pixel light-emitting branch in the two pixel light-emitting branches, and the third type of metal electrode bridges the third metal layer of each pixel light-emitting branch in the two pixel light-emitting branches.

[0033] Optionally, the pixel definition layer defines the first metal layer, the first electroluminescent layer, the second metal layer, the second electroluminescent layer, the third metal layer, the third electroluminescent layer, and the fourth metal layer as three pixel light emitting branches; the first type of metal electrode is located in the first metal layer; the second type of metal electrode is located in the second metal layer; and the third type of metal electrode is located in the third metal layer.

[0034] The first metal layer in the three pixel light emitting branches is connected to each other by metal tracks; the second metal layer in the three pixel light emitting branches is connected to each other by metal tracks; and the third metal layer in the three pixel light emitting branches is connected to each other by metal tracks.

[0035] The first type of metal electrode bridges the first metal layer of two pixel light emitting branches in the three pixel light emitting branches; the second type of metal electrode bridges the second metal layer of two pixel light emitting branches in the three pixel light emitting branches; and the third type of metal electrode bridges the third metal layer of two pixel light emitting branches in the three pixel light emitting branches.

[0036] Optionally, the pixel definition layer defines the first metal layer, the first electroluminescent layer, the second metal layer, the second electroluminescent layer, the third metal layer, the third electroluminescent layer, and the fourth metal layer as four pixel light emitting branches; the first type of metal electrode is located in the first metal layer; the second type of metal electrode is located in the second metal layer; and the third type of metal electrode is located in the third metal layer.

[0037] The first metal layer in the four pixel light emitting branches is connected to each other by metal tracks; the second metal layer in the four pixel light emitting branches is connected to each other by metal tracks; and the third metal layer in the four pixel light emitting branches is connected to each other by metal tracks.

[0038] The first type of metal electrode bridges the first metal layer of at least two pixel light emitting branches in the four pixel light emitting branches; the second type of metal electrode bridges the second metal layer of at least two pixel light emitting branches in the four pixel light emitting branches; and the third type of metal electrode bridges the third metal layer of at least two pixel light emitting branches in the four pixel light emitting branches.

[0039] Optionally, the pixel definition layer defines the first metal layer as a first first metal region included in a first pixel light emitting branch, a second first metal region included in a second pixel light emitting branch, a third first metal region included in a third pixel light emitting branch, and a fourth first metal region included in a fourth pixel light emitting branch; the pixel definition layer defines the second metal layer as a first second metal region included in the first pixel light emitting branch, a second second metal region included in the second pixel light emitting branch, a third second metal region included in the third pixel light emitting branch, and a fourth second metal region included in the fourth pixel light emitting branch; the pixel definition layer defines the third metal layer as a first third metal region included in the first pixel light emitting branch, a second third metal region included in the second pixel light emitting branch, a third third metal region included in the third pixel light emitting branch, and a fourth third metal region included in the fourth pixel light emitting branch; the first type of metal electrode is located in the first metal layer; the second type of metal electrode is located in the second metal layer; and the third type of metal electrode is located in the third metal layer.

[0040] The first first metal region and the second first metal region are connected by a metal trace, the second first metal region and the third first metal region are connected by a metal trace, the third first metal region and the fourth first metal region are connected by a metal trace, the fourth first metal region and the first first metal region are connected by a metal trace; the first second metal region and the second second metal region are connected by a metal trace, the second second metal region and the third second metal region are connected by a metal trace, the third second metal region and the fourth second metal region are connected by a metal trace, the fourth second metal region and the first second metal region are connected by a metal trace; the first third metal region and the second third metal region are connected by a metal trace, the second third metal region and the third third metal region are connected by a metal trace, the third third metal region and the fourth third metal region are connected by a metal trace, the fourth third metal region and the first third metal region are connected by a metal trace.

[0041] The first type of metal electrode bridges the first first metal region and the second first metal region; the second type of metal electrode bridges the second second metal region and the fourth second metal region; and the third type of metal electrode bridges the first third metal region and the third third metal region.

[0042] Optionally, the pixel definition layer defines the first metal layer as a first first metal region included in a first pixel light emitting branch, a second first metal region included in a second pixel light emitting branch, a third first metal region included in a third pixel light emitting branch, and a fourth first metal region included in a fourth pixel light emitting branch; the pixel definition layer defines the second metal layer as a first second metal region included in the first pixel light emitting branch, a second second metal region included in the second pixel light emitting branch, a third second metal region included in the third pixel light emitting branch, and a fourth second metal region included in the fourth pixel light emitting branch; the pixel definition layer defines the third metal layer as a first third metal region included in the first pixel light emitting branch, a second third metal region included in the second pixel light emitting branch, a third third metal region included in the third pixel light emitting branch, and a fourth third metal region included in the fourth pixel light emitting branch; the first type of metal electrode is located in the first metal layer; the second type of metal electrode is located in the second metal layer; and the third type of metal electrode is located in the third metal layer.

[0043] The pixel unit includes two first type of metal electrodes, one of which bridges the first first metal region and the second first metal region, and the other of which bridges the third first metal region and the fourth first metal region; the pixel unit includes two second type of metal electrodes, one of which bridges the second second metal region and the fourth second metal region, and the other of which bridges the first second metal region and the third second metal region; and the pixel unit includes two third type of metal electrodes, one of which bridges the first third metal region and the third third metal region, and the other of which bridges the second third metal region and the fourth third metal region.

[0044] Optionally, the fourth metal layer is distributed in an integral plane.

[0045] In a third aspect, the embodiments of the present disclosure provide a dark spot repairing method of a display substrate, applied to any of the display substrates described in the present disclosure, and the method comprises:

[0046] Determining a pixel light emitting branch in the display substrate that has a short circuit;

[0047] Cutting off electrical connections between light emitting elements of each color in the pixel light emitting branch that has the short circuit and light emitting elements of remaining pixel light emitting branches in the pixel unit, and electrical connections between the pixel light emitting branch that has the short circuit and electrode voltages; the electrode voltages include electrode voltages accessed by the first metal layer, electrode voltages accessed by the second metal layer, and electrode voltages accessed by the third metal layer.

[0048] Optionally, the cutting off the electrical connection between the light emitting element of each color in the pixel light emitting branch in which the short circuit occurs and the light emitting element of the remaining pixel light emitting branch in the pixel unit, and the electrical connection between the pixel light emitting branch in which the short circuit occurs and the electrode voltage comprises:

[0049] cutting off the metal trace between the first metal region in the pixel light emitting branch in which the short circuit occurs and the first metal region of the remaining pixel light emitting branch in the pixel unit; cutting off the metal trace between the second metal region in the pixel light emitting branch in which the short circuit occurs and the second metal region of the remaining pixel light emitting branch in the pixel unit; cutting off the metal trace between the third metal region in the pixel light emitting branch in which the short circuit occurs and the third metal region of the remaining pixel light emitting branch in the pixel unit;

[0050] cutting off the first type of metal electrode bridged by the first metal layer in the pixel light emitting branch in which the short circuit occurs, the second type of metal electrode bridged by the second metal layer in the pixel light emitting branch in which the short circuit occurs, and the third type of metal electrode bridged by the third metal layer in the pixel light emitting branch in which the short circuit occurs.

[0051] Optionally, the cutting off the electrical connection between the light emitting element of each color in the pixel light emitting branch in which the short circuit occurs and the light emitting element of the remaining pixel light emitting branch in the pixel unit, and the electrical connection between the pixel light emitting branch in which the short circuit occurs and the electrode voltage comprises:

[0052] cutting off the first type of metal electrode bridged by the first metal layer in the pixel light emitting branch in which the short circuit occurs, the second type of metal electrode bridged by the second metal layer in the pixel light emitting branch in which the short circuit occurs, and the third type of metal electrode bridged by the third metal layer in the pixel light emitting branch in which the short circuit occurs.

[0053] Additional features and advantages of the disclosure will be set forth in the description that follows, and in part will be apparent from the description, or can be learned by practice of the present disclosure. The advantages of the present disclosure will be realized and attained by the structure particularly pointed out in the written description and claims thereof.

[0054] Other aspects can become apparent to those of ordinary skill in the art upon reading and understanding the attached figures and detailed description.

[0055] BRIEF DESCRIPTION OF DRAWINGS

[0056] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, will be described in detail. The drawings serve to illustrate embodiments of the present disclosure and to explain the principles of the present disclosure, and do not limit the present disclosure. Other embodiments can be derived from the drawings without creative effort by those skilled in the art.

[0057] Fig. 1 is an equivalent circuit schematic diagram of a pixel circuit provided by an embodiment of the present disclosure;

[0058] Fig. 2 is an equivalent circuit schematic diagram of another pixel circuit provided by an embodiment of the present disclosure;

[0059] Fig. 3 is an equivalent circuit schematic diagram of still another pixel circuit provided by an embodiment of the present disclosure;

[0060] Fig. 4 is a schematic diagram of a film layer structure of a display substrate provided by an embodiment of the present disclosure;

[0061] Fig. 5 is a schematic diagram of a planar structure of a display substrate provided by an embodiment of the present disclosure;

[0062] Fig. 6 is a schematic diagram of another film layer structure of a display substrate provided by an embodiment of the present disclosure;

[0063] Fig. 7 is a schematic diagram of performing dark spot repair on a display substrate provided by an embodiment of the present disclosure;

[0064] Fig. 8 is a schematic diagram of a first metal layer of a display substrate provided by an embodiment of the present disclosure;

[0065] Fig. 9 is a schematic diagram of a first metal layer and a pixel definition layer of a display substrate provided by an embodiment of the present disclosure;

[0066] Fig. 10 is a schematic diagram of a first metal layer, a pixel definition layer and a first electroluminescent layer of a display substrate provided by an embodiment of the present disclosure;

[0067] Fig. 11 is a schematic diagram of a first metal layer, a pixel definition layer, a first electroluminescent layer and a second metal layer of a display substrate provided by an embodiment of the present disclosure;

[0068] Fig. 12 is a schematic diagram of a first metal layer, a pixel definition layer, a second metal layer and a third metal layer of a display substrate provided by an embodiment of the present disclosure;

[0069] Fig. 13 is a schematic diagram of a planar structure of another display substrate provided by an embodiment of the present disclosure;

[0070] Fig. 14 is a schematic diagram of another film layer structure of a display substrate provided by an embodiment of the present disclosure;

[0071] Fig. 15 is a schematic diagram of performing dark spot repair on another display substrate provided by an embodiment of the present disclosure;

[0072] Fig. 16 is a schematic diagram of a first metal layer of another display substrate provided by an embodiment of the present disclosure;

[0073] Fig. 17 is a schematic diagram of a first metal layer and a pixel definition layer of another display substrate provided by an embodiment of the present disclosure;

[0074] FIG. 18 is a schematic view of a first metal layer, a pixel definition layer, and a second metal layer of another display substrate according to an embodiment of the present disclosure;

[0075] FIG. 19 is a schematic view of a first metal layer, a pixel definition layer, a second metal layer, and a third metal layer of another display substrate according to an embodiment of the present disclosure;

[0076] FIG. 20 is a schematic view of a planar structure of yet another display substrate according to an embodiment of the present disclosure;

[0077] FIG. 21 is a schematic view of repairing a dark spot for yet another display substrate according to an embodiment of the present disclosure;

[0078] FIG. 22 is a schematic view of a planar structure of yet another display substrate according to an embodiment of the present disclosure;

[0079] FIG. 23 is a schematic view of repairing a dark spot for yet another display substrate according to an embodiment of the present disclosure;

[0080] FIG. 24 is a flowchart of a dark spot repairing method according to an embodiment of the present disclosure.

[0081] DETAILED DESCRIPTION

[0082] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art based on the present disclosure are within the scope of protection of the present disclosure.

[0083] Unless otherwise defined, technical terms or scientific terms used in the present disclosure should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are used to distinguish different components. The terms "include", "contain", and similar terms mean that the elements or objects before the terms encompass the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms do not mean physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to indicate relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0084] The size of the plurality of patterns in the display substrate related to the embodiments of the present disclosure is usually micron or smaller in actual products, and the size of one or more structures in the drawings of the embodiments of the present disclosure is enlarged for the purpose of clarity, and does not represent the actual size and ratio unless otherwise explicitly stated.

[0085] Since the number of electrodes of the stacked OLED device is large, the conductive particles are strictly controlled in the device preparation process. When the conductive particles cause a short circuit between the electrodes in the device, a dark spot defect of the OLED device is caused, which affects the product yield of the produced OLED device.

[0086] The embodiments of the present disclosure provide a pixel circuit and a corresponding display substrate. In the exemplary embodiments of the present disclosure, the device is divided into blocks, one pixel is divided into different light-emitting regions according to the number of electrodes in the pixel, and the electrode branch of the light-emitting region is designed to be repairable, which ensures that different light-emitting regions in the pixel can be repaired for dark spots on the basis of being able to emit light. Thus, in the actual production scene, for the problem that the produced device is judged as an unqualified product due to the existence of a dark spot defect, the device can be repaired to a qualified device through dark spot repair of the device, thereby improving the product quality yield.

[0087] In addition, the design of dividing the device into blocks and ensuring that different light-emitting regions in the pixel can emit light in the exemplary embodiments of the present disclosure optimizes the distribution of elements in the device and the driving mode of the electrodes in the device, thereby providing technical support for ultra-high PPI (Pixels Per Inch, a kind of pixel density unit) products and having a broad application prospect.

[0088] The embodiments of the present disclosure provide a pixel circuit, which can include:

[0089] A plurality of pixel units, the pixel unit can include: at least two pixel light-emitting branches;

[0090] The pixel light-emitting branch can include: at least two of the first color light-emitting element, the second color light-emitting element and the third color light-emitting element; the same color light-emitting elements in the plurality of pixel light-emitting branches of the same pixel unit are connected in parallel;

[0091] The pixel unit can further include: a first type of metal electrode, a second type of metal electrode and a third type of metal electrode, the first type of metal electrode is configured to access the electrode voltage of the first color light-emitting element, the second type of metal electrode is configured to access the electrode voltage of the second color light-emitting element, and the third type of metal electrode is configured to access the electrode voltage of the third color light-emitting element;

[0092] The first type of metal electrode bridges the first electrodes of the first color light emitting elements of at least two pixel light emitting branches, the second type of metal electrode bridges the first electrodes of the second color light emitting elements of at least two pixel light emitting branches, and the third type of metal electrode bridges the first electrodes of the third color light emitting elements of at least two pixel light emitting branches.

[0093] In an example, the pixel circuit is configured with light emitting elements of each of a predetermined plurality of colors, and color display is performed based on the light emitting elements of different colors. In an embodiment of the present disclosure, the light emitting elements involved in the pixel circuit can include first color light emitting elements, second color light emitting elements, and third color light emitting elements. In some example embodiments, when the pixel circuit is used for display in RGB (Red Green Blue) format, the first color light emitting elements can be red light emitting elements that emit red (R) light, the second color light emitting elements can be blue light emitting elements that emit blue (B) light, and the third color light emitting elements can be green light emitting elements that emit green (G) light.

[0094] In the pixel circuit provided in the present disclosure, each pixel unit has a plurality of pixel light emitting branches. Each pixel light emitting branch has the ability to independently realize the light emitting function. In order to realize independent control of the remaining pixel light emitting branches in the case of short circuit of the electrodes in any pixel light emitting branch in the pixel unit, the first electrodes of the same color light emitting elements in different pixel light emitting branches are designed to be separated from each other.

[0095] In actual applications, the first electrodes of the first color light emitting elements, the first electrodes of the second color light emitting elements, and the first electrodes of the third color light emitting elements can all be connected to a specific electrode voltage, so that each light emitting element can be driven to emit light. In one possible implementation, the first electrode refers to the anode of the light emitting element, or in another possible implementation, the first electrode can refer to the cathode of the light emitting element.

[0096] In an example, the electrical signal of the electrode voltage can be introduced to the light emitting element through a metal electrode. In an embodiment of the present disclosure, the metal electrode used to connect the electrode voltage of the first color light emitting element is referred to as a first type of metal electrode, the metal electrode used to connect the electrode voltage of the second color light emitting element is referred to as a second type of metal electrode, and the metal electrode used to connect the electrode voltage of the third color light emitting element is referred to as a third type of metal electrode.

[0097] The pixel circuit provided by the embodiment of the present disclosure can isolate the pixel light emitting branch in the case of short circuit of any pixel in the pixel unit, and ensure the normal operation of other pixel light emitting branches. The first type of metal electrode bridges the first electrode of the first color light emitting element of at least two pixel light emitting branches in the pixel unit. The second type of metal electrode bridges the first electrode of the second color light emitting element of at least two pixel light emitting branches in the pixel unit. The third type of metal electrode bridges the first electrode of the third color light emitting element of at least two pixel light emitting branches in the pixel unit. For each pixel unit, the light emitting elements of the same color in one or more pixel light emitting branches can be in a parallel structure, so that in the case that the first electrode of a certain light emitting element is not directly connected to the corresponding electrode voltage through the metal electrode, the first electrode of the light emitting element can receive the electrical signal of the corresponding electrode voltage through other light emitting elements in parallel, thereby realizing the light emitting function.

[0098] Thus, in the pixel circuit provided by the exemplary embodiment of the present disclosure, the light emitting elements in different pixel light emitting branches can realize the light emitting function by cooperating with each other through the parallel structure after the metal electrode introduces the electrical signal to the corresponding pixel light emitting branch. In the case of short circuit of any pixel light emitting branch in the pixel unit, the isolation of the pixel light emitting branch can be realized by cutting off the electrical connection between the light emitting elements of each color in the pixel light emitting branch and the light emitting elements in the remaining pixel light emitting branches, and cutting off the electrical connection between the first electrode of each color light emitting element in the pixel light emitting branch and the corresponding electrode voltage. Since each type of metal electrode bridges the first electrode of the light emitting element of the corresponding color in at least two pixel light emitting branches, even if the metal electrode connected to the light emitting element of each color in the pixel light emitting branch with short circuit problem is cut off, the light emitting element of each color in at least one pixel light emitting branch in the pixel unit can directly receive the electrical signal of the corresponding electrode voltage through the metal electrode, and the electrical signal can be transmitted to the light emitting element of each color in the remaining pixel light emitting branch without the metal electrode through the parallel structure between the light emitting elements. That is, after the pixel light emitting branch with short circuit problem is isolated, the remaining pixel light emitting branches in the pixel unit can still realize the light emitting function normally, thereby achieving the effect of repairing dark spots, and further improving the product yield in the production scene of display devices. The design of the present disclosure divides the pixel unit into different pixel light emitting branches, and ensures that different pixel light emitting branches in the pixel unit can emit light, which optimizes the distribution of elements in the device and the driving mode of the electrode in the device, thereby providing technical support for ultra-high PPI products.

[0099] For the convenience of understanding, the pixel circuit provided by the present disclosure is described below in combination with several exemplary embodiments.

[0100] In some exemplary embodiments, as shown in FIG. 1, the pixel circuit provided by the exemplary embodiments of the present disclosure includes four pixel light emitting branches in each pixel unit. Among them, the first color light emitting element R1, the second color light emitting element B1 and the third color light emitting element G1 can constitute a pixel light emitting branch, the first color light emitting element R2, the second color light emitting element B2 and the third color light emitting element G2 can constitute another pixel light emitting branch, the first color light emitting element R3, the second color light emitting element B3 and the third color light emitting element G3 can constitute another pixel light emitting branch, and the first color light emitting element R4, the second color light emitting element B4 and the third color light emitting element G4 can constitute another pixel light emitting branch.

[0101] In some exemplary embodiments, the light emitting elements of the same color in the plurality of pixel light emitting branches in the pixel unit are in parallel structure. For example, as shown in FIG. 1, the light emitting elements of the same color in the four pixel light emitting branches shown in FIG. 1 are in parallel structure. The first electrodes of the first color light emitting elements R1, R2, R3 and R4 in the four pixel light emitting branches are connected to the voltage S in parallel structure; the first electrodes of the second color light emitting elements B1, B2, B3 and B4 are connected in parallel and converge at the first potential point N1; and the first electrodes of the third color light emitting elements G1, G2, G3 and G4 are connected in parallel and converge at the second potential point N2. In addition, the second electrodes of the third color light emitting elements G1, G2, G3 and G4 can be connected to the negative electrode VSS of the power supply.

[0102] In some exemplary embodiments, for each color of light emitting element, in the four pixel light emitting branches shown in FIG. 1, a metal electrode (not shown in the figure) is provided on the first electrode of the light emitting element of the color in at least two pixel light emitting branches, and the metal electrode is connected to the corresponding electrode voltage. In the actual pixel structure, the light emitting elements of the same color in one or more pixel light emitting branches in the pixel unit can form a parallel structure through the cooperation of the metal electrodes and the metal traces between the electrodes of different light emitting elements.

[0103] In a possible implementation, the first type of metal electrode bridges the first electrodes of two of the first color light emitting elements R1, R2, R3 and R4; the second type of metal electrode bridges the first electrodes of two of the second color light emitting elements B1, B2, B3 and B4; and the third type of metal electrode bridges the first electrodes of two of the third color light emitting elements G1, G2, G3 and G4. Moreover, the first electrodes of the first color light emitting elements R1, R2, R3 and R4 are connected to each other by metal traces, the first electrodes of the second color light emitting elements B1, B2, B3 and B4 are connected to each other by metal traces, and the first electrodes of the third color light emitting elements G1, G2, G3 and G4 are connected to each other by metal traces.

[0104] In another possible implementation, the first electrodes of the first color light emitting elements R1, R2, R3 and R4 are each connected to a first type of metal electrode; the first electrodes of the second color light emitting elements B1, B2, B3 and B4 are each connected to a second type of metal electrode; and the first electrodes of the third color light emitting elements G1, G2, G3 and G4 are each connected to a third type of metal electrode.

[0105] In some example embodiments, as shown in FIG. 2, the first type of metal electrode bridges the first electrodes of the first color light emitting elements R5 and R6, the second type of metal electrode bridges the first electrodes of the second color light emitting elements B5 and B6, and the third type of metal electrode bridges the first electrodes of the third color light emitting elements G5 and G6.

[0106] In some example embodiments, as shown in FIG. 2, the first type of metal electrode bridges the first electrodes of the first color light emitting elements R5 and R6, the second type of metal electrode bridges the first electrodes of the second color light emitting elements B5 and B6, and the third type of metal electrode bridges the first electrodes of the third color light emitting elements G5 and G6.

[0107] In some example embodiments, as shown in FIG. 3, the present example embodiments further provide yet another pixel circuit, each pixel unit in the pixel circuit including three pixel light emitting branches. Among them, the first color light emitting element R7, the second color light emitting element B7 and the third color light emitting element G7 can constitute one pixel light emitting branch, the first color light emitting element R8, the second color light emitting element B8 and the third color light emitting element G8 can constitute another pixel light emitting branch, and the first color light emitting element R9, the second color light emitting element B9 and the third color light emitting element G9 can constitute yet another pixel light emitting branch.

[0108] In some example embodiments, as shown in FIG. 3, the first color light emitting elements R7, R8 and R9 are connected in parallel with each other, the second color light emitting elements B7, B8 and B9 are connected in parallel with each other, and the third color light emitting elements G7, G8 and G9 are also connected in parallel with each other.

[0109] In addition, the first electrodes of the first color light emitting elements R7, R8 and R9 can be connected to each other by metal traces, the first electrodes of the second color light emitting elements B7, B8 and B9 can be connected to each other by metal traces, and the first electrodes of the third color light emitting elements G7, G8 and G9 can be connected to each other by metal traces.

[0110] In this way, the pixel circuit provided by the above-mentioned embodiments of the present disclosure divides the pixel unit into different light emitting areas (i.e., different pixel light emitting branches) according to the number of electrodes in the pixel unit, and each light emitting area has a first color light emitting element, a second color light emitting element and a third color light emitting element. In addition, the electrodes of the same color light emitting elements in different pixel light emitting areas are separated accordingly, and the potential points between each device are converged to form a parallel structure, which facilitates maintenance in the case of short circuit in any light emitting area. How to implement maintenance for dark spots under this architecture will be described in the subsequent embodiments of the display substrate.

[0111] On the basis of the above-mentioned embodiments of the pixel circuit, the present disclosure further provides a display substrate. FIG. 4 is a schematic diagram of a film layer structure of the display substrate according to an embodiment of the present disclosure, which is an example of a film layer structure of a pixel unit of the display substrate. As shown in FIG. 4, the display substrate includes a substrate 101 and a plurality of pixel units disposed on the substrate 101.

[0112] At least one pixel unit of the plurality of pixel units includes a first metal layer 102, a first electroluminescent layer 103, a second metal layer 104, a second electroluminescent layer 105, a third metal layer 106, a third electroluminescent layer 107, a fourth metal layer 108, and a pixel definition layer 109.

[0113] The first metal layer 102 is arranged on the substrate 101, the first electroluminescent layer 103 is arranged on the side of the first metal layer 102 away from the substrate 101, the second metal layer 104 is arranged on the side of the first electroluminescent layer 103 away from the substrate 101, the second electroluminescent layer 105 is arranged on the side of the second metal layer 104 away from the substrate 101, the third metal layer 106 is arranged on the side of the second electroluminescent layer 105 away from the substrate 101, the third electroluminescent layer 107 is arranged on the side of the third metal layer 106 away from the substrate 101, and the fourth metal layer 108 is arranged on the side of the third electroluminescent layer 107 away from the substrate 101.

[0114] In a possible implementation, the first electroluminescent layer 103 can be a red electroluminescent layer, the second electroluminescent layer 105 can be a blue electroluminescent layer, and the third electroluminescent layer 107 can be a green electroluminescent layer.

[0115] In some example embodiments, the first metal layer 102 is a first electrode of the first electroluminescent layer 103, the second metal layer 104 is a second electrode of the first electroluminescent layer 103 and a first electrode of the second electroluminescent layer 105, the third metal layer 106 is a second electrode of the second electroluminescent layer 105 and a first electrode of the third electroluminescent layer 107, and the fourth metal layer 108 is a second electrode of the third electroluminescent layer 107. In a possible implementation, the first electrode refers to an anode of an electroluminescent layer, or, in another possible implementation, the first electrode refers to a cathode of an electroluminescent layer.

[0116] In some example embodiments, the pixel definition layer 109 defines the first metal layer 102, the first electroluminescent layer 103, the second metal layer 104, the second electroluminescent layer 105, the third metal layer 106, the third electroluminescent layer 107, and the fourth metal layer 108 as a plurality of pixel light-emitting branches. At least one pixel light-emitting branch of the plurality of pixel light-emitting branches includes a first color light-emitting element, a second color light-emitting element, and a third color light-emitting element. In the same pixel unit, light-emitting elements of the same color in the plurality of pixel light-emitting branches are connected in parallel.

[0117] In some example embodiments, the pixel definition layer 109 is provided with pixel openings spaced apart from each other, which are configured to isolate different pixel light emitting branches from each other and define the distribution positions of the pixel light emitting branches. For example, two pixel openings are shown in FIG. 4, and the first metal layer 102, the first electroluminescent layer 103, the second metal layer 104, the second electroluminescent layer 105, the third metal layer 106, the third electroluminescent layer 107 and the fourth metal layer 108 provided in one pixel opening constitute one pixel light emitting branch. For example, the first metal layer 102, the first electroluminescent layer 103 and the second metal layer 104 in the pixel light emitting branch constitute a first color light emitting element of the pixel light emitting branch, the second metal layer 104, the second electroluminescent layer 105 and the third metal layer 106 in the pixel light emitting branch constitute a second color light emitting element of the pixel light emitting branch, and the third metal layer 106, the third electroluminescent layer 107 and the fourth metal layer 108 in the pixel light emitting branch constitute a third color light emitting element of the pixel light emitting branch.

[0118] In addition, in order to facilitate isolation of a pixel light emitting branch in the case of a short circuit of the pixel light emitting branch, the first metal layer 102, the first electroluminescent layer 103, the second metal layer 104, the second electroluminescent layer 105, the third metal layer 106 and the third electroluminescent layer 107 of the pixel light emitting branches in the pixel unit are provided corresponding to the pixel openings, and the corresponding film layers between different pixel light emitting branches are designed to be separated from each other. The fourth metal layer 108 can be designed as a full-surface design covering multiple pixel light emitting branches.

[0119] In some example embodiments, the pixel unit further comprises a first type of metal electrode, a second type of metal electrode and a third type of metal electrode, the first type of metal electrode bridges the first metal layer 102 of at least two pixel light emitting branches, the second type of metal electrode bridges the second metal layer 104 of at least two pixel light emitting branches, and the third type of metal electrode bridges the third metal layer 106 of at least two pixel light emitting branches.

[0120] As described above in the description of the pixel circuit, the first electrode of each light emitting element can be connected to a corresponding electrode voltage, that is, the first metal layer 102, the second metal layer 104 and the third metal layer 106 can be connected to a corresponding electrode voltage.

[0121] Thus, in the display substrate provided by the embodiments of the present disclosure, the first metal layer 102 in at least two pixel light emitting branches can directly receive the electrical signal of the corresponding electrode voltage through the first type of metal electrode, and since the first color light emitting element in one or more pixel light emitting branches is in a parallel structure, the first metal layer 102 in the pixel light emitting branch without the first type of metal electrode can receive the signal of the electrode voltage through the first metal layer 102 in the other pixel light emitting branch in parallel with itself. The second metal layer 104 and the third metal layer 106 in the pixel light emitting branch are the same, and thus will not be described here.

[0122] Therefore, for any electrode layer in the first metal layer 102, the second metal layer 104 and the third metal layer 106, the electrical signal is introduced into the electrode layer in at least two pixel light emitting branches of the pixel unit by the metal electrode, and the electrical signal is transmitted to the corresponding electrode layer without the metal electrode by the electrode layer receiving the electrical signal, so that each light emitting element in each pixel light emitting branch can realize the light emitting function under the driving of the electrical signal through the cooperation between the electrode layers in each pixel light emitting branch.

[0123] In this way, when a short circuit occurs in any pixel light emitting branch in the pixel unit, the pixel light emitting branch can be isolated by cutting off the electrical connection between the first metal layer 102, the second metal layer 104 and the third metal layer 106 in the pixel light emitting branch and the electrode layers in the other pixel light emitting branches, and cutting off the connection between the first metal layer 102, the second metal layer 104 and the third metal layer 106 in the pixel light emitting branch and the corresponding electrode voltage. Moreover, for each electrode layer in the first metal layer 102, the second metal layer 104 and the third metal layer 106, since the electrical signal is directly introduced into the corresponding electrode layer in at least two pixel light emitting branches by the metal electrode, after the pixel light emitting branch with the short circuit is isolated, there is still a corresponding electrode layer in at least one pixel light emitting branch, which can directly receive the electrical signal of the corresponding electrode voltage through the metal electrode, and transmit the electrical signal to the corresponding electrode layer without the metal electrode in the other pixel light emitting branches through the parallel structure between the electrode layers, that is, after the pixel light emitting branch with the short circuit is isolated, the remaining pixel light emitting branches can still realize the light emitting function normally.

[0124] For example, the short circuit in any pixel light emitting branch can be a short circuit between the first metal layer 102 and the second metal layer 104 in the pixel light emitting branch, or a short circuit between the second metal layer 104 and the third metal layer 106, or a short circuit between the third metal layer 106 and the fourth metal layer 108.

[0125] In addition, after isolating the short-circuited pixel light-emitting branch, the light emitted by the remaining pixel light-emitting branches in the pixel unit can be used to compensate for the light that cannot be emitted by the isolated pixel light-emitting branch through optical compensation, so that the pixel unit can display normally and ensure product yield. For example, for the short-circuited pixel light-emitting branch, the brightness of the light-emitting element in the other pixel light-emitting branches belonging to the same pixel unit can be increased to compensate for the light of the short-circuited pixel light-emitting branch. The actual compensation brightness can be measured according to experiments, and the present disclosure is not limited herein.

[0126] In some example embodiments, the pixel definition layer 109 defines the first metal layer 102 to include a first first metal region included in the first pixel light-emitting branch, a second first metal region included in the second pixel light-emitting branch, a third first metal region included in the third pixel light-emitting branch, and a fourth first metal region included in the fourth pixel light-emitting branch; the pixel definition layer 109 defines the second metal layer 104 to include a first second metal region included in the first pixel light-emitting branch, a second second metal region included in the second pixel light-emitting branch, a third second metal region included in the third pixel light-emitting branch, and a fourth second metal region included in the fourth pixel light-emitting branch; the pixel definition layer 109 defines the third metal layer 106 to include a first third metal region included in the first pixel light-emitting branch, a second third metal region included in the second pixel light-emitting branch, a third third metal region included in the third pixel light-emitting branch, and a fourth third metal region included in the fourth pixel light-emitting branch; the first type of metal electrode 1021 is located in the first metal layer 102; the second type of metal electrode 1041 is located in the second metal layer 104; and the third type of metal electrode 1061 is located in the third metal layer 106.

[0127] That is, the pixel definition layer 109 defines the first metal layer 102, the first electroluminescent layer 103, the second metal layer 104, the second electroluminescent layer 105, the third metal layer 106, the third electroluminescent layer 107, and the fourth metal layer 108 into four pixel light-emitting branches. For example, as shown in FIG. 5, in the example of FIG. 5, the four pixel light-emitting branches are labeled as A, B, C, and D, respectively.

[0128] In some example embodiments, referring to FIG. 5 (the cross-sectional view of the pixel unit at the dotted line EE' in FIG. 4 described above can be understood as the schematic view of FIG. 5), the metal traces 1022 in the first metal layer 102 are multiple, respectively connecting the first metal layer 102 of the pixel light emitting branch A and the first metal layer 102 of the pixel light emitting branch B, the first metal layer 102 of the pixel light emitting branch C and the first metal layer 102 of the pixel light emitting branch D, the first metal layer 102 of the pixel light emitting branch A and the first metal layer 102 of the pixel light emitting branch C, the first metal layer 102 of the pixel light emitting branch B and the first metal layer 102 of the pixel light emitting branch D; the metal traces 1042 in the second metal layer 104 are multiple, respectively connecting the second metal layer 104 of the pixel light emitting branch A and the second metal layer 104 of the pixel light emitting branch B, the second metal layer 104 of the pixel light emitting branch C and the second metal layer 104 of the pixel light emitting branch D, the second metal layer 104 of the pixel light emitting branch A and the second metal layer 104 of the pixel light emitting branch C, the second metal layer 104 of the pixel light emitting branch B and the second metal layer 104 of the pixel light emitting branch D; the metal traces 1062 in the third metal layer 106 are multiple, respectively connecting the third metal layer 106 of the pixel light emitting branch A and the third metal layer 106 of the pixel light emitting branch B, connecting the third metal layer 106 of the pixel light emitting branch C and the third metal layer 106 of the pixel light emitting branch D, connecting the third metal layer 106 of the pixel light emitting branch A and the third metal layer 106 of the pixel light emitting branch C, connecting the third metal layer 106 of the pixel light emitting branch B and the third metal layer 106 of the pixel light emitting branch D.

[0129] In some example embodiments, the first type of metal electrode 1021 constitutes the first electrode potential point of the first color light emitting element, the first type of metal electrode 1021 in FIG. 5 is divided into two channels, respectively introducing electrical signals into the first metal layer 102 of the pixel light emitting branch A and the first metal layer 102 of the pixel light emitting branch C; the second type of metal electrode 1041 constitutes the first electrode potential point of the second color light emitting element, the second type of metal electrode 1041 in FIG. 5 is divided into two channels, respectively introducing electrical signals into the second metal layer 104 of the pixel light emitting branch B and the second metal layer 104 of the pixel light emitting branch D; the third type of metal electrode 1061 constitutes the first electrode potential point of the third color light emitting element, the third type of metal electrode 1061 in FIG. 5 is divided into two channels, respectively introducing electrical signals into the third metal layer 106 of the pixel light emitting branch A and the third metal layer 106 of the pixel light emitting branch B.

[0130] In this way, after the electrical signals enter the opening area through the metal electrodes, the light emitting elements in the plurality of pixel light emitting branches can realize the light emitting effect through the mutual cooperation of the potentials between the electrodes due to the bridging structure formed by the metal traces of the electrode layers between different pixel light emitting branches, and subsequent isolation of any pixel light emitting branch is facilitated. For example, taking the first metal layer 102 as an example, the first type of metal electrode 1021 introduces two electrical signals into the first metal layer 102 of the pixel light emitting branch A and the first metal layer 102 of the pixel light emitting branch C, and the electrical signals entering the pixel light emitting branch A and the pixel light emitting branch C are transmitted to the first metal layer 102 of the pixel light emitting branch B and the first metal layer 102 of the pixel light emitting branch D through the metal trace 1022; the process of receiving electrical signals by the second metal layer 104 and the third metal layer 106 is the same, and will not be described here. As can be seen, in the pixel unit structure shown in FIG. 4, the pixel light emitting branches A, B, C and D can all realize the light emitting function.

[0131] Next, taking the short circuit of the pixel light emitting branch B and the non-short circuit of the pixel light emitting branches A, C and D as an example, the technical solutions in the example embodiments of the present disclosure will be described below in combination with FIG. 5, FIG. 6 and FIG. 7.

[0132] In some example embodiments, FIG. 6 is another film layer structure diagram of a display substrate provided by an embodiment of the present disclosure, and FIG. 6 takes the short circuit of the pixel light emitting branch B as an example to show the cross-sectional view of the pixel unit along the EE' direction in FIG. 5. As can be seen from FIG. 6, there are conductive particles in the pixel light emitting branch B, causing the short circuit of the pixel light emitting branch B. In combination with FIG. 5, it can be understood that, due to the bridging structure formed by the metal traces of the electrode layers in the pixel light emitting branches A, B, C and D, when the short circuit occurs in the pixel light emitting branch B, it will cause the pixel light emitting branches A, B, C and D to be unable to normally emit light, thereby forming a pixel dark spot. Here, the pixel dark spot is shown by a black oval dot in FIG. 6.

[0133] In order to repair the dark spot of the pixel unit of the display substrate, the metal trace 1022 between the first metal layer 102 of the short-circuited pixel light emitting branch B and the first metal layer 102 of the other pixel light emitting branches can be cut off, the metal trace 1042 between the second metal layer 104 of the short-circuited pixel light emitting branch B and the second metal layer 104 of the other pixel light emitting branches can be cut off, the metal trace 1062 between the third metal layer 106 of the short-circuited pixel light emitting branch B and the third metal layer 106 of the other pixel light emitting branches can be cut off, and the metal electrodes provided on the first metal layer 102, the second metal layer 104 and the third metal layer 106 of the short-circuited pixel light emitting branch B can be cut off, so that the pixel light emitting branch B can be isolated, and the pixel light emitting branches A, C and D can still normally emit light.

[0134] In some example embodiments, referring to FIG. 7, a schematic diagram of a scheme for repairing a dark spot of a pixel unit in a case of short circuit of the pixel light emitting branch B is shown. For example, the metal trace 1022, the metal trace 1042 and the metal trace 1062 connected between the pixel light emitting branch B and the pixel light emitting branch A can be cut off by laser cutting, the metal trace 1022, the metal trace 1042 and the metal trace 1062 connected between the pixel light emitting branch B and the pixel light emitting branch D can be cut off by laser cutting, and the second type of metal electrode 1041 and the third type of metal electrode 1061 directly connected to the pixel light emitting branch B can be cut off by laser cutting. In FIG. 7, the corresponding metal traces are shown as black straight lines, and the pixel dark spot is shown as a black dot.

[0135] After the above laser cutting is completed, the pixel light emitting branch B is isolated and will not emit light again. The first type of metal electrode 1021 is not cut off and can still introduce electrical signals into the first metal layer 102 of the pixel light emitting branch A and the pixel light emitting branch C, and the electrical signals can be transmitted from the first metal layer 102 of the pixel light emitting branch C to the first metal layer 102 of the pixel light emitting branch D through the metal trace 1022. The second metal layer 104 of the pixel light emitting branch D can still receive electrical signals through the second type of metal electrode 1041 and transmit the electrical signals to the second metal layer 104 in the pixel light emitting branch C and A through the metal trace 1042. The third metal layer 106 of the pixel light emitting branch A can still receive electrical signals through the third type of metal electrode 1061 and transmit the electrical signals to the third metal layer 106 in the pixel light emitting branch C and D through the metal trace 1062. Thus, the pixel light emitting branches A, C and D can still work normally.

[0136] Moreover, after the pixel light emitting branch B is isolated, the pixel light emitting branch B cannot emit light, and the pixel light emitting branches A, C and D can optically compensate for the light emitted by the pixel light emitting branch B to ensure that the pixel unit can display normally. For example, the optical compensation can be achieved by increasing the luminance of the pixel light emitting branches A, C and D to ensure that the corresponding pixel unit can display normally, thereby improving the yield of the display substrate.

[0137] Similar to the process of repairing a dark spot of the pixel light emitting branch B described above, in a case of short circuit of any one of the pixel light emitting branches A, C and D, a dark spot can be repaired based on the same principle.

[0138] In order to facilitate understanding of the film layer structure of the pixel unit in the display substrate provided in the present embodiment, FIGS. 8 to 12 provide several different structure diagrams of the pixel unit in the process of preparing the display substrate provided in the example embodiments of the present disclosure.

[0139] In some example embodiments, as shown in FIG. 8, the structure of the first metal layer 102 and the first metal electrode 1021 and the metal trace 1022 contained in the first metal layer 102 are shown. Based on FIG. 8, it can be seen that the first metal layer 102 of the four pixel light emitting branches is designed to be separated from each other. Here, the structure of the first metal layer 102 of each pixel light emitting branch is only schematic, and the first metal layer 102 of each pixel light emitting branch can be designed in a pattern based on actual needs during preparation.

[0140] In some example embodiments, as shown in FIG. 9, the structure of the pixel definition layer 109 is shown based on FIG. 8. Based on FIG. 9, it can be seen that the pixel definition layer 109 provides four pixel openings in the pixel unit and divides the pixel unit into four light emitting areas. In one possible implementation, the four areas are equal in size.

[0141] In some example embodiments, as shown in FIG. 10, the structure of the first electroluminescent layer 103 is shown based on FIG. 9.

[0142] In some example embodiments, as shown in FIG. 11, the structure of the second metal layer 104 and the second metal electrode 1041 and the metal trace 1042 contained in the second metal layer 104 are shown based on FIG. 10.

[0143] In some example embodiments, as shown in FIG. 12, the structure of the second metal layer 104, the second metal electrode 1041 and the metal trace 1042 contained in the second metal layer 104, and the structure of the third metal layer 106, the third metal electrode 1061 and the metal trace 1062 contained in the third metal layer 106 are shown based on FIG. 9. Based on FIG. 12, it can be seen that under the definition of the pixel opening, the first metal layer 102, the second metal layer 104 and the third metal layer 106 in different light emitting areas are separated from each other in a grid shape.

[0144] The display substrate provided by the above example embodiments can achieve dark spot repair in the case of short circuit of any one of the pixel light emitting branches in the pixel unit.

[0145] When both the pixel light emitting branch B and the pixel light emitting branch C shown in FIG. 5 are short-circuited, all the metal traces 1022, the metal traces 1042 and the metal traces 1062 provided in the pixel unit can be cut off. In this case, the second metal layer 104 of the pixel light emitting branch A cannot receive an electrical signal, and the first metal layer 102 and the third metal layer 106 of the pixel light emitting branch D cannot receive an electrical signal, and the pixel light emitting branches A and D cannot emit light normally, and cannot achieve the effect of dark spot repair.

[0146] Therefore, in order to realize that the display substrate can realize dark point repair in the case that short circuit occurs in any multiple pixel light emitting branches in the pixel unit, the present disclosure exemplary embodiments provide another display substrate, which comprises: the pixel circuit in one or more exemplary embodiments described above, the pixel circuit comprising a plurality of pixel units, and the pixel circuit can comprise four pixel light emitting branches; the four pixel light emitting branches comprise a first pixel light emitting branch, a second pixel light emitting branch, a third pixel light emitting branch and a fourth pixel light emitting branch; wherein the pixel unit comprises two first type metal electrodes, one of which bridges the first electrodes of the first color light emitting elements in the first pixel light emitting branch and the second pixel light emitting branch, and the other of which bridges the first electrodes of the first color light emitting elements in the third pixel light emitting branch and the fourth pixel light emitting branch; the pixel unit comprises two second type metal electrodes, one of which bridges the first electrodes of the second color light emitting elements in the second pixel light emitting branch and the fourth pixel light emitting branch, and the other of which bridges the first electrodes of the second color light emitting elements in the first pixel light emitting branch and the third pixel light emitting branch; the pixel unit comprises two third type metal electrodes, one of which bridges the first electrodes of the third color light emitting elements in the first pixel light emitting branch and the third pixel light emitting branch, and the other of which bridges the first electrodes of the third color light emitting elements in the second pixel light emitting branch and the fourth pixel light emitting branch.

[0147] In some exemplary embodiments, as shown in FIG. 13 in combination with FIG. 5, FIG. 13 adds corresponding metal electrodes on the opposite side of each metal electrode based on the several metal electrodes shown in FIG. 5. As shown in FIG. 13, the pixel unit can comprise: two first type metal electrodes 1021, two second type metal electrodes 1041 and two third type metal electrodes 1061.

[0148] The two first type metal electrodes 1021 can comprise: one first type metal electrode 1021a and another first type metal electrode 1021b, wherein the first type metal electrode 1021b is arranged on the opposite side of the first type metal electrode 1021a, the first type metal electrode 1021a divides the electrical signal into two channels to introduce the electrical signal into the first metal layer 102 of the pixel light emitting branch A and the first metal layer 102 of the pixel light emitting branch C respectively, and the first type metal electrode 1021b divides the electrical signal into two channels to introduce the electrical signal into the first metal layer 102 of the pixel light emitting branch B and the first metal layer 102 of the pixel light emitting branch D respectively.

[0149] The two second-type metal electrodes 1041 can include one second-type metal electrode 1041a and another second-type metal electrode 1041b, wherein the second-type metal electrode 1041b is disposed at the opposite side of the second-type metal electrode 1041a, and the second-type metal electrode 1041a divides the electrical signal into two channels to be introduced into the second metal layer 104 of the pixel light-emitting branch B and the second metal layer of the pixel light-emitting branch D, and the second-type metal electrode 1041b divides the electrical signal into two channels to be introduced into the second metal layer 104 of the pixel light-emitting branch A and the second metal layer of the pixel light-emitting branch C.

[0150] The two third-type metal electrodes 1061 can include one third-type metal electrode 1061a and another third-type metal electrode 1061b, wherein the third-type metal electrode 1061b is disposed at the opposite side of the third-type metal electrode 1061a, and the third-type metal electrode 1061a divides the electrical signal into two channels to be introduced into the third metal layer 106 of the pixel light-emitting branch A and the third metal layer 106 of the pixel light-emitting branch B, and the third-type metal electrode 1061b divides the electrical signal into two channels to be introduced into the third metal layer 106 of the pixel light-emitting branch C and the third metal layer 106 of the pixel light-emitting branch D.

[0151] Here, FIG. 13 is a schematic diagram taking the first-type metal electrode 1021a corresponding to the first-type metal electrode 1021 in the pixel unit provided in FIG. 5, the second-type metal electrode 1041a corresponding to the second-type metal electrode 1041 in the pixel unit provided in FIG. 5, and the third-type metal electrode 1061a corresponding to the third-type metal electrode 1061 in the pixel unit provided in FIG. 5 as an example.

[0152] Next, taking the short circuit of the pixel light-emitting branch B and the pixel light-emitting branch C as an example, the process of repairing the dark spot of the display substrate in the example embodiment of the present disclosure is described below in combination with FIG. 13, FIG. 14 and FIG. 15. FIG. 14 is a schematic diagram of the film layer structure of the pixel unit shown in FIG. 13, taking the short circuit of the pixel light-emitting branch B and the pixel light-emitting branch C as an example. As can be seen from FIG. 14, there are conductive particles in the pixel light-emitting branch C and the pixel light-emitting branch B, so that the two pixel light-emitting branches will have a short circuit problem.

[0153] In some example embodiments, referring to FIG. 15, a schematic diagram of a dark spot repair scheme for the pixel unit in the case of short circuit of the pixel light emitting branch B and the pixel light emitting branch C is shown. For example, in the case of short circuit of the pixel light emitting branch B and the pixel light emitting branch C, the third type of metal electrode 1061a, the second type of metal electrode 1041a and the first type of metal electrode 1021b connected by the pixel light emitting branch B can be cut off by laser cutting, and the first type of metal electrode 1021a, the second type of metal electrode 1041b and the third type of metal electrode 1061b connected by the pixel light emitting branch C can be cut off by laser cutting, so as to realize isolation of the pixel light emitting branch B and C, and ensure that the pixel light emitting branch A and D can work normally.

[0154] Similar to the above process of dark spot repair for the pixel light emitting branch B and the pixel light emitting branch C, in the case of short circuit of any two pixel light emitting branches or any three pixel light emitting branches among the pixel light emitting branch A, B, C and D, dark spot repair can be realized based on the same principle.

[0155] In order to facilitate understanding of the film layer structure of the pixel unit in the display substrate provided by the present embodiment, FIGS. 16-19 provide several different structure diagrams of the pixel unit in the process of preparing the display substrate provided by the example embodiments of the present disclosure.

[0156] In some example embodiments, as shown in FIG. 16, FIG. 16 shows the structure of the first metal layer 102, and two first type of metal electrodes 1021 (which can include one first type of metal electrode 1021a and another first type of metal electrode 1021b) included in the first metal layer 102. The first metal layer 102 can also include metal traces 1022 (not shown).

[0157] In some example embodiments, as shown in FIG. 17, FIG. 17 shows the structure of the pixel definition layer 109 based on FIG. 16.

[0158] In some example embodiments, as shown in FIG. 18, FIG. 18 shows the structure of the second metal layer 104 and two second type of metal electrodes 1041 (which can include one second type of metal electrode 1041a and another second type of metal electrode 1041b) included in the second metal layer 104 based on FIG. 17. The second metal layer 104 can also include metal traces 1042 (not shown).

[0159] In some example embodiments, as shown in FIG. 19, which is based on FIG. 18, the structure of the third metal layer 106, and two third-type metal electrodes 1061 (which can include one third-type metal electrode 1061a and another third-type metal electrode 1061b) included in the third metal layer 106, and metal traces 1062 (not shown) included in the third metal layer 106 are shown.

[0160] In some example embodiments, as shown in FIG. 20, in the display substrate provided in the example embodiments of the present disclosure, the pixel definition layer 109 can define the first metal layer 102, the first electroluminescent layer 103, the second metal layer 104, the second electroluminescent layer 105, the third metal layer 106, the third electroluminescent layer 107, and the fourth metal layer 108 as two pixel light-emitting branches. In FIG. 20, the two pixel light-emitting branches are respectively marked as E and F.

[0161] In some example embodiments, the first-type metal electrode 1021 bridges the first metal layer 102 of the pixel light-emitting branch E and the first metal layer 102 of the pixel light-emitting branch F, the second-type metal electrode 1041 bridges the second metal layer 104 of the pixel light-emitting branch E and the second metal layer 104 of the pixel light-emitting branch F, and the third-type metal electrode 1061 bridges the third metal layer 106 of the pixel light-emitting branch E and the third metal layer 106 of the pixel light-emitting branch F.

[0162] In some example embodiments, as shown in FIG. 21, a schematic diagram of a scheme for repairing a dark spot of a pixel unit in the case of short circuit of the pixel light-emitting branch E is shown. For example, for the display substrate provided in the present embodiment, in the case of short circuit of the pixel light-emitting branch E, laser cutting of the first metal electrode 1021, the second metal electrode 1041, and the third metal electrode 1061 shown in FIG. 21 can achieve dark spot repair.

[0163] In some example embodiments, as shown in FIG. 22, in the example embodiments of the present disclosure, the pixel definition layer 109 can define the first metal layer 102, the first electroluminescent layer 103, the second metal layer 104, the second electroluminescent layer 105, the third metal layer 106, the third electroluminescent layer 107, and the fourth metal layer 108 as three pixel light-emitting branches. In FIG. 22, the three pixel light-emitting branches are respectively marked as G, H, and I.

[0164] In some example embodiments, the metal traces 1022 in the first metal layer 102 are multiple, connecting the first metal layer 102 of the pixel light emitting branch G and the first metal layer 102 of the pixel light emitting branch H, the first metal layer 102 of the pixel light emitting branch H and the first metal layer 102 of the pixel light emitting branch I, the first metal layer 102 of the pixel light emitting branch I and the first metal layer 102 of the pixel light emitting branch G respectively; the metal traces 1042 in the second metal layer 104 are multiple, connecting the second metal layer 104 of the pixel light emitting branch G and the second metal layer 104 of the pixel light emitting branch H, the second metal layer 104 of the pixel light emitting branch H and the second metal layer 104 of the pixel light emitting branch I, the second metal layer 104 of the pixel light emitting branch I and the second metal layer 104 of the pixel light emitting branch G respectively; the metal traces 1062 in the third metal layer 106 are multiple, connecting the third metal layer 106 of the pixel light emitting branch G and the third metal layer 106 of the pixel light emitting branch H, the third metal layer 106 of the pixel light emitting branch H and the third metal layer 106 of the pixel light emitting branch I, the third metal layer 106 of the pixel light emitting branch I and the third metal layer 106 of the pixel light emitting branch G respectively.

[0165] In some example embodiments, the first type of metal electrode 1021 bridges the first metal layer 102 of the pixel light emitting branch G and the first metal layer 102 of the pixel light emitting branch I, the second type of metal electrode 1041 bridges the second metal layer 104 of the pixel light emitting branch H and the second metal layer 104 of the pixel light emitting branch I, and the third type of metal electrode 1061 bridges the third metal layer 106 of the pixel light emitting branch G and the third metal layer 106 of the pixel light emitting branch H.

[0166] As can be seen, in the pixel unit shown in FIG. 22, each electrode layer in each pixel light emitting branch can directly receive the electrical signal of the corresponding first electrode through the metal electrode, or indirectly receive the electrical signal of the corresponding electrode voltage through the metal trace, so that the pixel light emitting branches G, H and I can all realize the light emitting function.

[0167] In some example embodiments, referring to FIG. 23, FIG. 23 shows a schematic diagram of a scheme for repairing a dark spot of the pixel unit in the case of short circuit of the pixel light emitting branch G. For example, for the display substrate provided in the present embodiment, in the case of short circuit of the pixel light emitting branch G, by cutting off the metal traces provided between the pixel light emitting branch G and the pixel light emitting branch H, and between the pixel light emitting branch G and the pixel light emitting branch I, and cutting off the first type of metal electrode 1021 and the third type of metal electrode 1061 connected to the pixel light emitting branch G, the pixel light emitting branch G can be isolated, and the pixel light emitting branches H and I can normally emit light, realizing the repair of the dark spot.

[0168] Therefore, the display substrate provided by the above-mentioned embodiments of the present disclosure can distinguish the pixel units into a plurality of pixel light emitting branches according to the number of electrodes, and provide a design that can repair the pixel light emitting branches, so that different pixel light emitting branches in the pixel units can interact to realize light emission, and the pixel light emitting branch that has a short circuit can be isolated by laser repair to form a dark spot repair effect, thereby improving product yield and providing technical support for ultra-high PPI products.

[0169] The present disclosure also provides a dark spot repair method applied to any of the above-mentioned display substrates. Referring to FIG. 24, the method comprises the following steps:

[0170] Step S2401: determining a pixel light emitting branch that has a short circuit in the display substrate.

[0171] In the pixel light emitting branch that has a short circuit, any combination of the following situations can occur: the first metal layer 102 is short-circuited with the second metal layer 104, the second metal layer 104 is short-circuited with the third metal layer 106, and the third metal layer 106 is short-circuited with the fourth metal layer 108.

[0172] Step S2402: cutting off the electrical connection between the light emitting element of each color in the pixel light emitting branch that has a short circuit and the light emitting element of the remaining pixel light emitting branches in the pixel unit, and the electrical connection between the pixel light emitting branch that has a short circuit and the electrode voltage.

[0173] The electrode voltage includes the electrode voltage connected to the first metal layer 102, the electrode voltage connected to the second metal layer 104, and the electrode voltage connected to the third metal layer 106.

[0174] For example, when the display substrate provided by any of the above-mentioned embodiments of the present disclosure is applied, the isolation of the pixel light emitting branch that has a short circuit can be realized by cutting off the electrical connection between the pixel light emitting branch that has a short circuit and the remaining pixel light emitting branches in the pixel unit, and cutting off the electrical connection between the pixel light emitting branch that has a short circuit and the electrode voltage, and ensuring that the remaining pixel light emitting branches in the pixel unit can work normally, thereby achieving the dark spot repair effect.

[0175] The above-mentioned dark spot repair method will be described below in conjunction with several examples.

[0176] In some example embodiments, when metal wires are provided between the pixel light emitting branch that has a short circuit and other pixel light emitting branches, all the metal wires provided between the pixel light emitting branch that has a short circuit and other pixel light emitting branches can be cut off. When any electrode layer in the pixel light emitting branch that has a short circuit is connected to the first type of metal electrode 1021, the second type of metal electrode 1041, or the third type of metal electrode 1061, these metal electrodes can be cut off.

[0177] After the above operations are completed, the pixel light emitting branch with short circuit is isolated, and the remaining pixel light emitting branches are ensured to work normally, and dark spot repair is realized. The actual repair process can refer to the description of FIG. 5, FIG. 6 and FIG. 7.

[0178] In some other example embodiments, in the case where no metal wires are provided between the pixel light emitting branch with short circuit and other pixel light emitting branches, by cutting off the first type of metal electrode 1021, the second type of metal electrode 1041 and the third type of metal electrode 1061 connected with the electrode layer in the pixel light emitting branch with short circuit, the pixel light emitting branch with short circuit is isolated, and the remaining pixel light emitting branches are ensured to work normally, and dark spot repair is realized. The actual repair process can refer to the description of FIG. 13, FIG. 14 and FIG. 15.

[0179] In this document, the term "only" is used to identify one entity or operation from another entity or operation, but does not necessarily require or imply that there is any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0180] The above description is only exemplary embodiments of the present disclosure, and is not intended to limit the protection scope of the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A pixel circuit comprising: a plurality of pixel units, each pixel unit comprising at least two pixel light emitting branches; each pixel light emitting branch comprises at least two light emitting elements of first, second and third colors; and light emitting elements of the same color in each pixel light emitting branch of the same pixel unit are connected in parallel; each pixel unit further comprises a first, a second and a third metal electrode, the first metal electrode is used to access the electrode voltage of the light emitting element of the first color, the second metal electrode is used to access the electrode voltage of the light emitting element of the second color, and the third metal electrode is used to access the electrode voltage of the light emitting element of the third color; the first metal electrode bridges the first electrode of the light emitting element of the first color of at least two pixel light emitting branches, the second metal electrode bridges the first electrode of the light emitting element of the second color of at least two pixel light emitting branches, and the third metal electrode bridges the first electrode of the light emitting element of the third color of at least two pixel light emitting branches.

2. The pixel circuit of claim 1, wherein, each pixel unit comprises two pixel light emitting branches; the first metal electrode bridges the first electrode of the light emitting element of the first color of each pixel light emitting branch of the two pixel light emitting branches; the second metal electrode bridges the first electrode of the light emitting element of the second color of each pixel light emitting branch of the two pixel light emitting branches; and the third metal electrode bridges the first electrode of the light emitting element of the third color of each pixel light emitting branch of the two pixel light emitting branches.

3. The pixel circuit of claim 1, wherein, each pixel unit comprises three pixel light emitting branches; the first metal electrode bridges the first electrode of the light emitting element of the first color of at least two pixel light emitting branches of the three pixel light emitting branches; the second metal electrode bridges the first electrode of the light emitting element of the second color of at least two pixel light emitting branches of the three pixel light emitting branches; and the third metal electrode bridges the first electrode of the light emitting element of the third color of at least two pixel light emitting branches of the three pixel light emitting branches.

4. The pixel circuit of claim 1, wherein, the pixel circuit comprises four pixel light emitting branches; the first electrodes of the light emitting elements of the same color in the four pixel light emitting branches are connected to each other by metal traces; the first metal electrode bridges the first electrode of the light emitting element of the first color of two pixel light emitting branches of the four pixel light emitting branches; the second metal electrode bridges the first electrode of the light emitting element of the second color of two pixel light emitting branches of the four pixel light emitting branches; and the third metal electrode bridges the first electrode of the light emitting element of the third color of two pixel light emitting branches of the four pixel light emitting branches.

5. The pixel circuit of claim 1, wherein, the pixel circuit comprises four pixel light emitting branches; the first metal electrode bridges the first electrode of the light emitting element of the first color of each pixel light emitting branch of the four pixel light emitting branches; the second metal electrode bridges the first electrode of the light emitting element of the second color of each pixel light emitting branch of the four pixel light emitting branches; and the third metal electrode bridges the first electrode of the light emitting element of the third color of each pixel light emitting branch of the four pixel light emitting branches.

6. The pixel circuit of claim 5, wherein, The four pixel light emitting branches include a first pixel light emitting branch, a second pixel light emitting branch, a third pixel light emitting branch and a fourth pixel light emitting branch. The pixel unit includes two first type metal electrodes, one of which bridges the first electrodes of the first color light emitting elements in the first pixel light emitting branch and the second pixel light emitting branch, and the other of which bridges the first electrodes of the first color light emitting elements in the third pixel light emitting branch and the fourth pixel light emitting branch; the pixel unit includes two second type metal electrodes, one of which bridges the first electrodes of the second color light emitting elements in the second pixel light emitting branch and the fourth pixel light emitting branch, and the other of which bridges the first electrodes of the second color light emitting elements in the first pixel light emitting branch and the third pixel light emitting branch; the pixel unit includes two third type metal electrodes, one of which bridges the first electrodes of the third color light emitting elements in the first pixel light emitting branch and the third pixel light emitting branch, and the other of which bridges the first electrodes of the third color light emitting elements in the second pixel light emitting branch and the fourth pixel light emitting branch. The first color light emitting element, the second color light emitting element and the third color light emitting element in the same pixel light emitting branch are arranged in a stack.

7. The pixel circuit of claim 1, wherein, A substrate, at least two pixel units arranged on the substrate; 8. A display substrate, comprising: The pixel unit includes a first metal layer, a first electroluminescent layer, a second metal layer, a second electroluminescent layer, a third metal layer, a third electroluminescent layer, a fourth metal layer, and a pixel definition layer; The first metal layer is arranged on the substrate, the first electroluminescent layer is arranged on the side of the first metal layer away from the substrate, the second metal layer is arranged on the side of the first electroluminescent layer away from the substrate, the second electroluminescent layer is arranged on the side of the second metal layer away from the substrate, the third metal layer is arranged on the side of the second electroluminescent layer away from the substrate, the third electroluminescent layer is arranged on the side of the third metal layer away from the substrate, and the fourth metal layer is arranged on the side of the third electroluminescent layer away from the substrate; The pixel definition layer defines the first metal layer, the first electroluminescent layer, the second metal layer, the second electroluminescent layer, the third metal layer, the third electroluminescent layer, and the fourth metal layer into a plurality of pixel light emitting branches; The pixel light emitting branch includes a first color light emitting element, a second color light emitting element and a third color light emitting element; in each pixel light emitting branch of the same pixel unit, the light emitting elements of the same color are connected in parallel; The pixel unit further includes a first type metal electrode, a second type metal electrode and a third type metal electrode, the first type metal electrode bridges the first metal layer of at least two pixel light emitting branches, the second type metal electrode bridges the second metal layer of at least two pixel light emitting branches, and the third type metal electrode bridges the third metal layer of at least two pixel light emitting branches. ​ 9.The display substrate of claim 8, wherein, The pixel definition layer defines the first metal layer, the first electroluminescent layer, the second metal layer, the second electroluminescent layer, the third metal layer, the third electroluminescent layer, and the fourth metal layer as two pixel light-emitting branches; the first type of metal electrode is located in the first metal layer; The second type of metal electrode is located in the second metal layer; the third type of metal electrode is located in the third metal layer; The first type of metal electrode bridges the first metal layer of each of the two pixel light-emitting branches; the second type of metal electrode bridges the second metal layer of each of the two pixel light-emitting branches; and the third type of metal electrode bridges the third metal layer of each of the two pixel light-emitting branches. 10.The display substrate of claim 8, wherein, The pixel definition layer defines the first metal layer, the first electroluminescent layer, the second metal layer, the second electroluminescent layer, the third metal layer, the third electroluminescent layer, and the fourth metal layer as three pixel light-emitting branches; the first type of metal electrode is located in the first metal layer; The second type of metal electrode is located in the second metal layer; the third type of metal electrode is located in the third metal layer; The first metal layers in the three pixel light-emitting branches are connected to each other by metal traces; the second metal layers in the three pixel light-emitting branches are connected to each other by metal traces; and the third metal layers in the three pixel light-emitting branches are connected to each other by metal traces; The first type of metal electrode bridges the first metal layers of two pixel light-emitting branches of the three pixel light-emitting branches; the second type of metal electrode bridges the second metal layers of the two pixel light-emitting branches of the three pixel light-emitting branches; and the third type of metal electrode bridges the third metal layers of the two pixel light-emitting branches of the three pixel light-emitting branches. The pixel definition layer defines the first metal layer, the first electroluminescent layer, the second metal layer, the second electroluminescent layer, the third metal layer, the third electroluminescent layer, and the fourth metal layer as four pixel light-emitting branches; the first type of metal electrode is located in the first metal layer; 11.The display substrate of claim 8, wherein, The second type of metal electrode is located in the second metal layer; the third type of metal electrode is located in the third metal layer; The first metal layers in the four pixel light-emitting branches are connected to each other by metal traces; the second metal layers in the four pixel light-emitting branches are connected to each other by metal traces; and the third metal layers in the four pixel light-emitting branches are connected to each other by metal traces; The first type of metal electrode bridges the first metal layers of at least two pixel light-emitting branches of the four pixel light-emitting branches; the second type of metal electrode bridges the second metal layers of the at least two pixel light-emitting branches of the four pixel light-emitting branches; and the third type of metal electrode bridges the third metal layers of the at least two pixel light-emitting branches of the four pixel light-emitting branches. ​ 12.The display substrate of claim 11, wherein, The pixel definition layer defines the first metal layer as a first first metal region included in a first pixel light emitting branch, a second first metal region included in a second pixel light emitting branch, a third first metal region included in a third pixel light emitting branch, and a fourth first metal region included in a fourth pixel light emitting branch; the pixel definition layer defines the second metal layer as a first second metal region included in the first pixel light emitting branch, a second second metal region included in the second pixel light emitting branch, a third second metal region included in the third pixel light emitting branch, and a fourth second metal region included in the fourth pixel light emitting branch; the pixel definition layer defines the third metal layer as a first third metal region included in the first pixel light emitting branch, a second third metal region included in the second pixel light emitting branch, a third third metal region included in the third pixel light emitting branch, and a fourth third metal region included in the fourth pixel light emitting branch; the first type of metal electrode is located in the first metal layer; The second type of metal electrode is located in the second metal layer; The third type of metal electrode is located in the third metal layer; The first first metal region and the second first metal region are connected by a metal trace, the second first metal region and the third first metal region are connected by a metal trace, the third first metal region and the fourth first metal region are connected by a metal trace, the fourth first metal region and the first first metal region are connected by a metal trace; the first second metal region and the second second metal region are connected by a metal trace, the second second metal region and the third second metal region are connected by a metal trace, the third second metal region and the fourth second metal region are connected by a metal trace, the fourth second metal region and the first second metal region are connected by a metal trace; the first third metal region and the second third metal region are connected by a metal trace, the second third metal region and the third third metal region are connected by a metal trace, the third third metal region and the fourth third metal region are connected by a metal trace, the fourth third metal region and the first third metal region are connected by a metal trace; The first type of metal electrode bridges the first first metal region and the second first metal region; the second type of metal electrode bridges the second second metal region and the fourth second metal region; the third type of metal electrode bridges the first third metal region and the third third metal region. 13.The display substrate of claim 11, wherein, The pixel definition layer defines the first metal layer as a first first metal region included in a first pixel light emitting branch, a second first metal region included in a second pixel light emitting branch, a third first metal region included in a third pixel light emitting branch, and a fourth first metal region included in a fourth pixel light emitting branch; the pixel definition layer defines the second metal layer as a first second metal region included in the first pixel light emitting branch, a second second metal region included in the second pixel light emitting branch, a third second metal region included in the third pixel light emitting branch, and a fourth second metal region included in the fourth pixel light emitting branch; the pixel definition layer defines the third metal layer as a first third metal region included in the first pixel light emitting branch, a second third metal region included in the second pixel light emitting branch, a third third metal region included in the third pixel light emitting branch, and a fourth third metal region included in the fourth pixel light emitting branch; the first type of metal electrode is located in the first metal layer; The second type of metal electrode is located in the second metal layer; the third type of metal electrode is located in the third metal layer; The pixel unit includes two first type of metal electrodes, one of which bridges the first first metal region and the second first metal region, and the other of which bridges the third first metal region and the fourth first metal region; the pixel unit includes two second type of metal electrodes, one of which bridges the second second metal region and the fourth second metal region, and the other of which bridges the first second metal region and the third second metal region; the pixel unit includes two third type of metal electrodes, one of which bridges the first third metal region and the third third metal region, and the other of which bridges the second third metal region and the fourth third metal region. 14.The display substrate according to any one of claims 8 to 13, wherein The fourth metal layer is distributed in an integral plane.

15. A dark spot repairing method of a display substrate, applied to the display substrate of any one of claims 8 to 14, the method comprising: determining a pixel light emitting branch in the display substrate that has a short circuit; cutting off electrical connections between light emitting elements of each color in the pixel light emitting branch that has the short circuit and light emitting elements of remaining pixel light emitting branches in a pixel unit, and electrical connections between the pixel light emitting branch that has the short circuit and electrode voltages; the electrode voltages include an electrode voltage accessed by the first metal layer, an electrode voltage accessed by the second metal layer, and an electrode voltage accessed by the third metal layer.

16. The method of claim 15, applied to the display substrate of claim 12, the cutting off electrical connections between light emitting elements of each color in the pixel light emitting branch that has the short circuit and light emitting elements of remaining pixel light emitting branches in a pixel unit, and electrical connections between the pixel light emitting branch that has the short circuit and electrode voltages comprises: cutting off the metal wire between the first metal region in the short-circuiting pixel light emitting branch and the first metal region of the remaining pixel light emitting branches in the pixel unit; cutting off the metal wire between the second metal region in the short-circuiting pixel light emitting branch and the second metal region of the remaining pixel light emitting branches in the pixel unit; cutting off the metal wire between the third metal region in the short-circuiting pixel light emitting branch and the third metal region of the remaining pixel light emitting branches in the pixel unit; cutting off the first type of metal electrode bridged by the first metal layer in the short-circuiting pixel light emitting branch, the second type of metal electrode bridged by the second metal layer in the short-circuiting pixel light emitting branch, and the third type of metal electrode bridged by the third metal layer in the short-circuiting pixel light emitting branch.

17. The method of claim 15, applied to the display substrate of claim 13, wherein the cutting off the electrical connection between the light emitting element of each color in the short-circuiting pixel light emitting branch and the light emitting element of the remaining pixel light emitting branches in the pixel unit, and the electrical connection between the short-circuiting pixel light emitting branch and the electrode voltage comprises: cutting off the first type of metal electrode bridged by the first metal layer in the short-circuiting pixel light emitting branch, the second type of metal electrode bridged by the second metal layer in the short-circuiting pixel light emitting branch, and the third type of metal electrode bridged by the third metal layer in the short-circuiting pixel light emitting branch.

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