Display substrate and display device

Abstract

The display substrate and the display device are provided, and the display substrate comprises a substrate, a light-emitting device layer, and a plurality of pixel regions. The light-emitting device layer is arranged on one side of the substrate, and the light-emitting device layer comprises a plurality of light-emitting devices, each of which is arranged in one pixel region. Each light-emitting device comprises at least two spaced light-emitting areas, each of which comprises a first electrode, at least two light-emitting layers, and a second electrode which are arranged on the substrate in a stack, and an intermediate electrode is arranged between adjacent light-emitting layers. For the same light-emitting device, the first electrodes of the light-emitting areas are disconnected from each other and connected to the same first voltage control end through independent first conductive channels, and the intermediate electrodes of the light-emitting areas are disconnected from each other and connected to the same second voltage control end through independent second conductive channels.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular, to a display substrate and a display device. BACKGROUND

[0002] With the development of display technology, the resolution and pixel aperture ratio of display devices are increasingly required. Therefore, a stacked organic light emitting diode (OLED) emerges as the times require and has attracted widespread attention. The stacked OLED device is to stack different color light emitting device layers in each pixel area, so that different color light emitting devices share the same pixel opening, thereby breaking the PPI (Pixels Per Inch) limit caused by the array arrangement of different color light emitting devices, and greatly improving the pixel aperture ratio. However, in the stacked OLED architecture, the process of forming electrodes between adjacent light emitting layers is prone to cause a dark spot problem caused by impurity particles, which affects the product yield. SUMMARY

[0003] The display substrate and the display device provided by the embodiments of the present disclosure are beneficial to repair the above-mentioned stacked OLED particle dark spot problem, thereby improving the product yield.

[0004] In a first aspect, some embodiments of the present disclosure provide a display substrate, comprising: a substrate substrate comprising a plurality of pixel areas; a light emitting device layer disposed on one side of the substrate substrate, the light emitting device layer comprising a plurality of light emitting devices, each of the light emitting devices being disposed in one of the pixel areas. Wherein each of the light emitting devices comprises: at least two spaced apart light emitting regions, each of the light emitting regions comprising: a first electrode, at least two light emitting layers and a second electrode which are stacked on the substrate substrate, and an intermediate electrode disposed between adjacent light emitting layers; for the same light emitting device, the first electrodes of each of the light emitting regions are disconnected from each other and connected to the same first voltage control terminal through mutually independent first conductive channels, and the intermediate electrodes of each of the light emitting regions are disconnected from each other and connected to the same second voltage control terminal through mutually independent second conductive channels.

[0005] Optionally, the above-mentioned display substrate further comprises: a first repair electrode and a second repair electrode disposed in each of the pixel areas, the first repair electrode being connected to the first voltage control terminal, and the second repair electrode being connected to the second voltage control terminal. In the same light emitting device, the first electrodes of each of the light emitting regions are respectively connected to the first repair electrode through mutually independent first conductive channels; and each of the light emitting regions is respectively connected to the second repair electrode through mutually independent second conductive channels.

[0006] Optionally, the first repair electrode, the first conductive channel and the first electrode are arranged in the same layer, and the second repair electrode, the second conductive channel and the intermediate electrode are arranged in the same layer.

[0007] Optionally, the first repair electrode and the second repair electrode are located on opposite sides in the pixel region, and the arrangement direction of the first repair electrode and the second repair electrode intersects the arrangement direction of the at least two light-emitting regions.

[0008] Optionally, the light-emitting device layer further comprises a pixel defining layer arranged on the side of the first electrode away from the substrate, the pixel defining layer comprising a plurality of pixel openings and a barrier portion arranged in each pixel opening, the barrier portion separating the pixel opening into at least two pixel sub-openings, each pixel sub-opening being configured to define one of the light-emitting regions of the light-emitting device, and each pixel sub-opening exposing at least a part of the first electrode of the corresponding light-emitting region.

[0009] Optionally, the display substrate further comprises a connection metal layer arranged on the side of the first electrode close to the substrate, comprising a first connection portion and a second connection portion; and a planar layer arranged between the connection metal layer and the first electrode, the planar layer being provided with a first opening and a second opening. The first opening exposes at least a part of the first connection portion, and the first repair electrode is connected to the first voltage control terminal through the first connection portion exposed at the first opening; the pixel defining layer is further provided with a third opening, and the second connection portion, the second opening and the third opening have at least partial overlap in orthographic projection on the substrate, so as to expose at least a part of the second connection portion from the third opening, and the second repair electrode is connected to the second voltage control terminal through the second connection portion exposed at the third opening and the second opening.

[0010] Optionally, the second electrodes of the light-emitting devices are connected to each other, and the light-emitting layer between the intermediate electrode and the second electrode covers the intermediate electrode and covers the second conductive channel, the second repair electrode and the third opening, so as to prevent the second electrode from short-circuiting with the intermediate electrode.

[0011] Optionally, the at least two light-emitting regions comprise a first light-emitting region and a second light-emitting region, and the first electrodes of the first light-emitting region and the second light-emitting region are connected to the same first voltage control terminal through mutually independent first conductive channels, and the intermediate electrodes of the first light-emitting region and the second light-emitting region are connected to the same second voltage control terminal through mutually independent second conductive channels.

[0012] Optionally, the at least two light-emitting layers include a first light-emitting layer and a second light-emitting layer, and the intermediate electrode is arranged between the first light-emitting layer and the second light-emitting layer.

[0013] At least one of the first light-emitting layer and the second light-emitting layer is a quantum dot light-emitting layer, the first light-emitting layer emits light under the action of a first voltage difference between the first electrode and the intermediate electrode, and the second light-emitting layer emits light under the action of a second voltage difference between the intermediate electrode and the second electrode.

[0014] Optionally, one of the first light-emitting layer and the second light-emitting layer is an organic light-emitting layer, and the other is a quantum dot light-emitting layer; the organic light-emitting layer emits light of a first color; the quantum dot light-emitting layer includes first quantum dots and second quantum dots, the first quantum dots emit light of a second color, and the second quantum dots emit light of a third color.

[0015] Optionally, for each light-emitting region, the first electrode, the first light-emitting layer, and the intermediate electrode constitute a first light-emitting sub-element, the intermediate electrode, the second light-emitting layer, and the second electrode constitute a second light-emitting sub-element, and the first light-emitting sub-element and the second light-emitting sub-element are connected in series. The display substrate further includes a pixel circuit arranged on a side of the light-emitting device layer close to the substrate substrate, the pixel circuit includes a first driving sub-circuit and a second driving sub-circuit, the output ends of the first driving sub-circuit and the second driving sub-circuit are the second voltage control ends, the first driving sub-circuit is configured to control the size of the driving current flowing through the first light-emitting sub-element of each light-emitting region, and the second driving sub-circuit is configured to control the size of the driving current flowing through the second light-emitting sub-element of each light-emitting region.

[0016] In a second aspect, some embodiments of the present disclosure provide a display device, including the display substrate provided in the first aspect.

[0017] In the display substrate and display device provided by some embodiments of the present disclosure, the stacked light-emitting device arranged in each pixel region is divided into at least two spaced light-emitting areas, the first electrodes of each light-emitting area in the same light-emitting device are disconnected from each other and are led to the same first voltage control terminal through mutually independent first conductive channels, and the intermediate electrodes of each light-emitting area are disconnected from each other and are led to the same second voltage control terminal through mutually independent second conductive channels. In this way, when it is detected that a pixel region has a dark spot problem caused by a particle, the abnormal light-emitting area with the particle defect can be detected, and even the particle generating layer in the abnormal light-emitting area can be detected, and then the first conductive channel and / or the second conductive channel of the abnormal light-emitting area is cut off to disconnect the abnormal light-emitting area from other normal light-emitting areas in the pixel region, so as not to affect the display of the other normal light-emitting areas, and to facilitate improving the product yield.

[0018] The above description is only a summary of the technical solutions provided by the embodiments of the present disclosure, in order to more clearly understand the technical means of the embodiments of the present disclosure, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the embodiments of the present disclosure more obvious and easy to understand, the specific implementation of the embodiments of the present disclosure is described below. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present disclosure, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0020] Figure 1 The overall plane schematic diagram of the display substrate of some embodiments of the present disclosure is shown;

[0021] Figure 2 The plane schematic diagram of a single pixel region of the display substrate of some embodiments of the present disclosure is shown;

[0022] Figure 3 The cross-sectional schematic diagram of a single pixel region of the display substrate of some embodiments of the present disclosure is shown;

[0023] Figure 4 The plane schematic diagram of the first repair electrode, the first conductive channel and the first electrode of some embodiments of the present disclosure is shown;

[0024] Figure 5 The plane schematic diagram of the second repair electrode, the second conductive channel and the intermediate electrode of some embodiments of the present disclosure is shown;

[0025] Figure 6ASchematic diagram of a connection metal layer of some embodiments of the present disclosure;

[0026] Figure 6B Schematic diagram of a planar layer opening of some embodiments of the present disclosure;

[0027] Figure 6C Schematic diagram of a first via and a second via of some embodiments of the present disclosure;

[0028] Figure 6D Schematic diagram of a planar view after forming a first electrode, a first conductive channel, and a first repair electrode of some embodiments of the present disclosure;

[0029] Figure 6E Schematic diagram of an opening of a pixel defining layer of some embodiments of the present disclosure;

[0030] Figure 6F Schematic diagram of a planar view after forming a first light emitting layer of some embodiments of the present disclosure;

[0031] Figure 6G Schematic diagram of a planar view after forming a middle electrode, a second conductive channel, and a second repair electrode of some embodiments of the present disclosure;

[0032] Figure 6H Schematic diagram of a planar view after forming a second light emitting layer of some embodiments of the present disclosure;

[0033] Figure 7 Schematic diagram of a cross-sectional view of a single light emitting region of some embodiments of the present disclosure;

[0034] Figure 8 Equivalent circuit diagram of a light emitting device of a single pixel region of some embodiments of the present disclosure;

[0035] Figure 9 Circuit diagram of a pixel circuit of a display substrate of some embodiments of the present disclosure;

[0036] Figure 10 Schematic diagram of a repair of a Particle defect in a first light emitting layer of some embodiments of the present disclosure; Figure 2

[0037] Schematic diagram of a repair of a Particle defect in a second light emitting region LB of some embodiments of the present disclosure; Figure 11 Figure 7 Schematic diagram of a repair of a Particle defect in a first light emitting layer of a second light emitting region LB of some embodiments of the present disclosure;

[0038] Figure 12 Figure 2 Schematic diagram of a repair of a Particle defect in a first light emitting layer of a second light emitting region LB of some embodiments of the present disclosure;

[0039] Figure 13 Schematic diagram of a repair of a Particle defect in a first light emitting layer of a second light emitting region LB of some embodiments of the present disclosure;​​Figure 7 A schematic diagram of a Particle defect in the second light-emitting layer in the second light-emitting region LB;

[0040] Figure 14 A schematic diagram of a display device is shown. Figure 2 A repair schematic diagram of a Particle defect in the second light-emitting layer in the second light-emitting region LB;

[0041] Figure 15 A schematic diagram of a display device is shown. DETAILED DESCRIPTION

[0042] Exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0043] It should be noted that the term "and / or" appearing in the present document merely describes an association relationship of associated objects, and can represent three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. The term "multiple" includes two or more than two. The terms "include" or "contain" and the like mean that the elements or objects appearing before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0044] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or there can be an intermediate layer between the layer or element and the other layer or substrate. The present disclosure refers to "A and B are disposed in the same layer" as A and B are formed at the same time by the same patterning process. The present disclosure refers to "patterning process" as including processes such as coating photoresist, mask exposure, development, etching, and stripping photoresist for metal materials, inorganic materials, or transparent conductive materials, and processes such as coating organic materials, mask exposure, and development for organic materials.

[0045] Figure 1 A schematic diagram of a display substrate is shown. As shown in FIG. 1, the display substrate includes a plurality of sub-pixels SP1, SP2, and SP3, and each sub-pixel SP1, SP2, and SP3 includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel. Figure 1As shown, some embodiments of this disclosure provide a display substrate 10 including: a display area DR and a non-display area NR at least partially surrounding the display area DR. The display area DR includes a plurality of pixel areas arranged in an array. Each pixel area is provided with a sub-pixel P. Each sub-pixel P includes a light-emitting device and pixel circuitry for driving the light-emitting device.

[0046] For example, such as Figure 1 As shown, the display substrate 10 also includes multiple scan lines GL and multiple data lines DL. The multiple scan lines GL and multiple data lines DL intersect each other to define multiple pixel areas distributed in an array in the display area DR, and a pixel circuit of a sub-pixel P is set in each pixel area.

[0047] For example, such as Figure 1 As shown, the display substrate 10 may further include a scan driving circuit SC and a data driving circuit DC located in the non-display area NR. The scan driving circuit SC may be, for example, a gate driving circuit (e.g., a GOA driving circuit). The scan driving circuit SC is connected to the pixel circuit via scan lines GL to provide various scan signals, and the data driving circuit DC is connected to the pixel circuit via data lines DL to provide data signals. It should be noted that... Figure 1 The positional relationship of the scan drive circuit SC and data drive circuit DC, scan line GL and data line DL in the display substrate 10 shown is only an example; the actual arrangement can be designed as needed.

[0048] The light-emitting device in a sub-pixel P includes at least two stacked light-emitting layers, enabling a single sub-pixel P to emit multiple colors of light for full-color display. For example, a sub-pixel P can emit red, green, and blue light. Of course, the types of light emitted by a single sub-pixel P are not limited to three; there is no limitation, and it can be less than or more than three types.

[0049] Through the above-described stacked light-emitting device architecture, multiple sub-pixels that emit multiple colors of light can be merged into a single sub-pixel P, sharing a single pixel aperture. Compared to the scheme of arranging multiple sub-pixels that emit a single color of light in a pixel area, this approach helps to reduce the area occupied by pixels with multiple light-emitting colors, thereby further improving the pixel aperture ratio (for example, the theoretical pixel aperture ratio can reach 300%), achieving higher resolution (PPI), and can be used to realize ultra-high PPI display products.

[0050] In order to further improve the product yield of the display substrate 10 on the basis of increasing pixel aperture ratio and resolution, thereby reducing production costs and promoting the mass production of ultra-high PPI products, some embodiments of this disclosure propose a maintenance design scheme applicable to the above-mentioned stacked light-emitting device architecture. The structure of the display substrate provided in these embodiments will be described in detail below.

[0051] For example, Figure 2 A plan view of a single pixel region of a display substrate is shown, Figure 3 A cross-sectional view of a single pixel region of a display substrate is shown, Figure 3 A cross-sectional view of a single pixel region of a display substrate is shown, Figure 2 A cross-sectional view of a single pixel region of a display substrate is shown, Figure 2 A plan view of a single pixel region of a display substrate is shown, 3 As shown in FIGS. 1 and 2, a display substrate 10 provided by some embodiments of the present disclosure includes a substrate 100 and a light-emitting device layer disposed on one side of the substrate 100.

[0052] The substrate 100 includes a plurality of pixel regions arranged in an array. For example, the substrate 100 can be a rigid substrate. The rigid substrate can include, for example, a glass substrate, a PMMA (Polymethyl methacrylate) substrate, a silicon substrate, etc. In this case, the display substrate 10 described above can be a rigid display substrate. For another example, the substrate 100 can be a flexible substrate. The flexible substrate can include, for example, a PET (Polyethylene terephthalate) substrate, a PEN (Polyethylene naphthalate two formic acid glycolester) substrate, or a PI (Polyimide) substrate, etc. In this case, the display substrate 10 described above can be a flexible display substrate.

[0053] The light-emitting device layer includes a plurality of light-emitting devices, each of which is disposed in a pixel region. Each light-emitting device includes at least two light-emitting regions arranged in an interval. Each light-emitting region includes a first electrode, at least two light-emitting layers, and a second electrode, which are stacked on the substrate 100, and an intermediate electrode disposed between adjacent light-emitting layers. For example, the specific number of the at least two light-emitting layers can be two, or can be three, such as a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer, or can be more, and the present embodiment is not limited in this regard.

[0054] For the same light-emitting device, the first electrodes of the light-emitting regions are separated from each other and connected to the same first voltage control terminal through independent first conductive channels to receive a first control voltage; the intermediate electrodes of the light-emitting regions are separated from each other and connected to the same second voltage control terminal through independent second conductive channels to receive a second control voltage; and the second electrodes of the light-emitting regions are connected to a third voltage control terminal to receive a third control voltage.

[0055] For example, the first voltage control terminal and the third voltage control terminal can be voltage output terminals, and the second voltage control terminal can be an output terminal of the pixel circuit, that is, the intermediate electrodes of each light emitting region of the same light emitting device are connected to the pixel circuit corresponding to the light emitting device through the second conductive channel and the second repair electrode, and the second control voltage is a driving voltage signal output by the pixel circuit. For example, the first voltage control terminal and the third voltage control terminal can be the same voltage terminal, that is, the first control voltage and the third control voltage are voltage signals from the same voltage terminal. Alternatively, the first voltage control terminal and the third voltage control terminal can also be different voltage terminals, that is, the first control voltage and the third control voltage are different voltage signals from different voltage terminals.

[0056] By dividing the stacked light emitting device arranged in each pixel area into at least two spaced light emitting regions, the first electrodes of each light emitting region in the same light emitting device are disconnected from each other and are led out to the same first voltage control terminal through mutually independent first conductive channels, and the intermediate electrodes of each light emitting region are disconnected from each other and are led out to the same second voltage control terminal through mutually independent second conductive channels, thereby providing the first electrodes and the intermediate electrodes of each light emitting region with independent voltage signal transmission paths. When it is detected that there is a pixel area with a dark spot problem caused by a Particle, the abnormal light emitting region with a Particle defect can be detected, and even the Particle generating layer in the abnormal light emitting region can be detected, and then the first conductive channel and / or the second conductive channel of the abnormal light emitting region is cut off to disconnect it from other normally displayed light emitting regions of the pixel area, thereby not affecting the display of other normally displayed light emitting regions, which is beneficial to improve product yield.

[0057] For example, considering the pixel aperture ratio, the number of light emitting regions divided by each light emitting device can be two. Of course, in other embodiments, the light emitting device can also be divided into three or more light emitting regions, and the present embodiment does not limit this. It should be noted that the film layer structures of each light emitting region are the same, and the same type of film layer of different light emitting regions can be arranged in the same layer; the areas of each light emitting region of the same light emitting device can be the same, or can be different, and are arranged according to actual needs.

[0058] Taking an example of each light emitting device including two light emitting regions, that is, a first light emitting region and a second light emitting region. At this time, the first electrodes of the first light emitting region and the second light emitting region are connected to the same first voltage control terminal through mutually independent first conductive channels. The intermediate electrodes of the first light emitting region and the second light emitting region are connected to the same second voltage control terminal through mutually independent second conductive channels. For example, as shown in FIG. 2, the first light emitting region and the second light emitting region are arranged in the same light emitting device, and the first electrodes of the first light emitting region and the second light emitting region are connected to the same first voltage control terminal through mutually independent first conductive channels. The intermediate electrodes of the first light emitting region and the second light emitting region are connected to the same second voltage control terminal through mutually independent second conductive channels. Figure 2As shown, the first electrode 131 of the first light-emitting region LA is led out and connected through the first conductive channel a1, the first electrode 131 of the second light-emitting region LB is led out and connected through the first conductive channel a2, the middle electrode 133 of the first light-emitting region LA is led out and connected through the second conductive channel b1, and the middle electrode 133 of the second light-emitting region LB is led out and connected through the second conductive channel b2.

[0059] First conductive channel (e.g.) Figure 2 The a1 and a2 channels can be disposed on the same layer as the first electrode 131. For example, the first conductive channel can be a signal trace extending from the first electrode 131, configured to transmit the first control voltage output from the first voltage control terminal to the first electrode 131 corresponding to the light-emitting area. The second conductive channel (such as...) Figure 2 b1 and b2) can be disposed on the same layer as the intermediate electrode 133. For example, the second conductive channel can be a signal trace extending from the intermediate electrode 133, configured to transmit the second control voltage output from the second voltage control terminal to the intermediate electrode 133 of the corresponding light-emitting area.

[0060] like Figure 2 As shown, to facilitate connecting the first conductive channels of each light-emitting region of the same light-emitting device to the same first voltage control terminal, and connecting the second conductive channels of each light-emitting region of the same light-emitting device to the same second voltage control terminal, the display substrate 10 provided in some embodiments of this disclosure may further include: a first maintenance electrode 141 and a second maintenance electrode 142. The first maintenance electrode 141 and the second maintenance electrode 142 are disposed in each pixel region. The first maintenance electrode 141 is connected to the first voltage control terminal in its respective pixel region, and the second maintenance electrode 142 is connected to the second voltage control terminal in its respective pixel region. In the same light-emitting device, the first electrode of each light-emitting region is connected through mutually independent first conductive channels (such as...). Figure 2 a1 and a2 in the figure are connected to the first maintenance electrode 141; each light-emitting area is connected to an independent second conductive channel (e.g., a1, a2 in the figure) through a ... Figure 2 b1 and b2) are connected to the second maintenance electrode 142.

[0061] The first maintenance electrode 141 and the second maintenance electrode 142 are disposed in areas outside the light-emitting areas. For example, the first maintenance electrode 141 and the second maintenance electrode 142 may be located on opposite sides of their respective pixel areas, and the arrangement direction of the first maintenance electrode 141 and the second maintenance electrode 142 intersects with the arrangement direction of the aforementioned at least two light-emitting areas. For example, as... Figure 2 As shown, the first light-emitting region LA and the second light-emitting region LB are along the first direction (e.g., Figure 2 The first maintenance electrode 141 and the second maintenance electrode 142 are arranged along the second direction (e.g., the X direction in the middle), while the second maintenance electrode 141 and the second maintenance electrode 142 are arranged along the second direction (e.g., the X direction in the middle). Figure 2The first direction and the second direction can be perpendicular to each other. For example, in order to facilitate the wiring of the first conductive channel and the second conductive channel, the first repair electrode 141 and the second repair electrode 142 can be located at the middle position of the at least two light emitting areas in the arrangement direction thereof.

[0062] One of the first electrode 131 and the second electrode 135 is an anode, and the other is a cathode. For example, the first electrode 131 is an anode, and the second electrode 135 is a cathode. The intermediate electrode 133 serves as a cathode of the lower light emitting layer adjacent thereto, and also serves as an anode of the upper light emitting layer adjacent thereto.

[0063] The first electrodes 131 of the adjacent light emitting areas of the same light emitting device are spaced apart from each other. For example, the light emitting device is a top emission device, and the first electrode 131 is a reflective anode. At this time, the structure of the first electrode 131 can be a composite structure composed of a transparent conductive oxide film / metal film / transparent conductive oxide film stacked in sequence. The material of the transparent conductive oxide film can be, for example, any one of ITO (Indium tin oxide) and IZO (Indium zinc oxide). The material of the metal film can be, for example, any one of gold (Au), silver (Ag), copper (Cu), aluminum (Al), nickel (Ni), and platinum (Pt). For another example, the structure of the first electrode 131 can also be a single-layer structure, and has conductivity and reflectivity at the same time. The material of the single-layer structure can be, for example, any one of Au, Ag, Cu, Al, Ni, Pt, and the like.

[0064] The intermediate electrodes 133 of the adjacent light emitting areas of the same light emitting device are also spaced apart from each other. For example, the intermediate electrode 133 can be a transparent conductive oxide film such as IZO or ITO.

[0065] In some embodiments, the second electrodes 135 of the light emitting devices can be connected to each other to form a coplanar electrode. For example, the second electrode 135 can be a transparent conductive oxide film such as IZO, or can also be a metal film with a certain transmittance, such as any one of aluminum (Al), silver (Ag), and magnesium (Mg), or any one of a magnesium-silver alloy and an aluminum-lithium alloy. The present embodiment does not limit this.

[0066] In an optional implementation, the first repair electrode 141, the first conductive channel (such as a1 and a2 in FIG. 1), and the first electrode 131 can be disposed in the same layer. Figure 4 Figure 4 A plan view of the first repair electrode, the first conductive channel, and the first electrode of some embodiments of the present disclosure is shown. As shown in FIG. 1, the first repair electrode 141, the first conductive channel (such as a1 and a2 in FIG. 1), and the first electrode 131 can be disposed in the same layer. Figure 3 ​As shown, a first conductive channel a1 is led out from the first electrode 131A of the first light-emitting region LA, and a first conductive channel a2 is led out from the first electrode 131B of the second light-emitting region LB. Both the first conductive channels a1 and a2 are connected to... Figure 2 The first maintenance electrode 141 is located on the left side of the light-emitting area. Similarly, the second maintenance electrode 142 and the second conductive channel (such as...) Figure 5 The b1 and b2 electrodes and the intermediate electrode 133 can be arranged in the same layer. Figure 5 A plan view of a second maintenance electrode, a second conductive channel, and an intermediate electrode according to some embodiments of this disclosure is shown. Figure 3 As shown, a second conductive channel b1 is led out from the intermediate electrode 133A of the first light-emitting region LA, and a second conductive channel b2 is led out from the intermediate electrode 133B of the second light-emitting region LB. Both the second conductive channels b1 and b2 are connected to... Figure 2 The second maintenance electrode 142 is located on the right side of the light-emitting area.

[0067] It should be noted that when the first electrode 131 is a multilayer composite structure, the first maintenance electrode 141 and the first conductive channel (such as...) Figure 2 The a1 and a2 in the text can be the same multilayer composite structure as the first electrode 131, or they can be disposed in the same layer as one of the layers in the multilayer composite structure. For example, when the first electrode 131 is an ITO / Cu / ITO composite structure, the first maintenance electrode 141 and the first conductive channel (such as...) Figure 3 a1 and a2) in the text can be a composite structure of ITO / Cu / ITO, or a single layer of ITO or Cu. This embodiment does not limit this.

[0068] For example, such as Figure 3 As shown, the aforementioned light-emitting device layer further includes a pixel defining layer 120, disposed on the side of the first electrode away from the substrate 100. The pixel defining layer 120 includes a plurality of pixel openings and a blocking portion 122 disposed within each pixel opening. Each pixel opening corresponds to a light-emitting device and is configured to define the light-emitting area of ​​the corresponding light-emitting device. The blocking portion 122 divides the pixel opening into at least two pixel sub-openings, thereby dividing the light-emitting device into at least two light-emitting areas as described above. Each pixel sub-opening is configured to define a light-emitting area of ​​the light-emitting device, and each pixel sub-opening exposes at least a portion of the first electrode of the corresponding light-emitting area.

[0069] In addition, such as Figure 3As shown, the display substrate 10 provided by some embodiments of the present disclosure further comprises a driving functional layer 110 disposed between the substrate 100 and the light emitting device layer. For example, the driving functional layer 110 can comprise, but is not limited to, functional layers configured to form a plurality of pixel circuits, such as an active layer, a gate metal layer, a gate dielectric layer, an interlayer insulating layer, a source-drain metal layer, and a passivation layer, each of which is connected to one of the light emitting devices to drive the corresponding light emitting device to emit light.

[0070] In an optional embodiment, in order to facilitate the connection of the first repair electrode to the first voltage control terminal and the connection of the second repair electrode to the second voltage control terminal, the driving functional layer 110 further comprises a connection metal layer disposed on the side of the first electrode close to the substrate 100. For example, the material of the connection metal layer can also be used to form the source-drain metal layer of the pixel circuit. The connection metal layer comprises a first connection portion M1 and a second connection portion M2.

[0071] In order to ensure the flatness of the first electrode, the driving functional layer 110 further comprises a planar layer disposed between the connection metal layer and the first electrode. For example, the material of the planar layer can be an insulating resin material. The planar layer is provided with a first opening K1 and a second opening K2, and the first opening K1 exposes at least a part of the first connection portion M1. The first repair electrode 141 is connected to the first voltage control terminal through the first connection portion M1 exposed at the first opening K1. The pixel defining layer 120 covers the first repair electrode 141 and the first opening K1 and is further provided with a third opening 123, and the second connection portion M2, the second opening K2, and the third opening 123 at least partially overlap on the substrate 100. The second connection portion M2 is exposed at least partially through the third opening 123. The second repair electrode 142 is connected to the second voltage control terminal through the second connection portion M2 exposed at the third opening 123 and the second opening K2.

[0072] For example, the first repair electrode 141 can be overlapped with the first connection portion M1 through the first opening K1, and the first connection portion M1 is connected to the first voltage control terminal through the first via V1. The second repair electrode 142 can be overlapped with the second connection portion M2 through the third opening 123 and the second opening K2, and the second connection portion M2 is connected to the second voltage control terminal through the second via V2.

[0073] For example, the first repair electrode 141 can be overlapped with the first connection portion M1 through the first opening K1, and the first connection portion M1 is connected to the first voltage control terminal through the first via V1. The second repair electrode 142 can be overlapped with the second connection portion M2 through the third opening 123 and the second opening K2, and the second connection portion M2 is connected to the second voltage control terminal through the second via V2. Figure 2As shown, in some embodiments, the at least two light-emitting layers are two separate layers: a first light-emitting layer 132 and a second light-emitting layer 134, with an intermediate electrode 133 disposed between the first light-emitting layer 132 and the second light-emitting layer 134. The first light-emitting layer 132 is stacked between the first electrode 131 and the intermediate electrode 133, and the second light-emitting layer 134 is stacked between the intermediate electrode 133 and the second electrode 132. The first light-emitting layer 132 emits light under the influence of a first voltage difference between the first electrode 131 and the intermediate electrode 133, and the second light-emitting layer 134 emits light under the influence of a second voltage difference between the intermediate electrode 133 and the second electrode 135, thereby achieving color display.

[0074] Considering that the second electrode 135 is stacked on top of the intermediate electrode 133, when the second electrodes 135 of each light-emitting device are interconnected to form coplanar electrodes, in order to avoid the second electrode 135 from interacting with the second conductive channel (such as...) Figure 6A to Figure 6H If contact occurs between the b1 and b2) and / or the second maintenance electrode 142, causing a short circuit between the second electrode 135 and the intermediate electrode 133, the light-emitting layer 134 located between the intermediate electrode 133 and the second electrode 135, i.e., the aforementioned second light-emitting layer 134, covers the intermediate electrode 133, and also covers the second conductive channel, the second maintenance electrode 142, and the third opening 123, thereby isolating the second electrode 135 from the second conductive channel and the second maintenance electrode 142, and preventing a short circuit between the second electrode 135 and the intermediate electrode 133. In other words, the orthographic projections of the intermediate electrode 133, the second conductive channel, the second maintenance electrode 142, and the third opening 123 on the substrate 100 are all within the boundary range of the orthographic projection of the second light-emitting layer 134 on the substrate 100.

[0075] The following describes the fabrication process of some film layers of an exemplary display substrate 10, taking the example of a light-emitting device divided into two light-emitting regions, namely the first light-emitting region LA and the second light-emitting region LB, with each light-emitting region including two light-emitting layers. Figure 6H A schematic diagram of the film layers from the connecting metal layer to the second electrode is shown within a single pixel region.

[0076] Reference 6A to Figure 6A A connecting metal layer can be fabricated first on the substrate 100 where the pixel circuit has been fabricated. For example, Figure 6A Schematic diagrams of the connecting metal layers of some embodiments of this disclosure are shown, such as Figure 6A As shown, the connecting metal layer includes a first connecting portion M1 and a second connecting portion M2. It should be noted that... Figure 6B The rectangular first connecting part M1 and the second connecting part M2 shown are for illustrative purposes only. The first connecting part M1 and the second connecting part M2 can also be other shapes, such as circles, ellipses or rhombuses, etc. This embodiment does not limit them.

[0077] Then, a planarization layer is formed on the connection metal layer, and a first opening K1 and a second opening K2 are prepared on the planarization layer at positions corresponding to the first connection part M1 and the second connection part M2. For example, Figure 6B A schematic diagram of the planarization layer openings of some embodiments of the present disclosure is shown as follows, Figure 6C As shown, the first connection part M1 is exposed at the first opening K1, and the second connection part M2 is exposed at the second opening K2.

[0078] Next, a first via is prepared at the first connection part M1 exposed at the first opening K1, and a second via is prepared at the second connection part M2 exposed at the second opening K2. For example, Figure 6C A schematic diagram of the first via and the second via of some embodiments of the present disclosure is shown as follows, Figure 6D As shown, the first connection part M1 is connected to the first voltage control terminal in the lower layer through the first via V1, and the second connection part M2 is connected to the second voltage control terminal in the lower layer through the second via V2.

[0079] Further, a first conductive film layer for preparing the first electrode is formed, and a patterning process is performed on the first conductive film layer to form the first electrode, the first conductive channel, and the first repair electrode of each light emitting region. For example, Figure 6D A schematic diagram of the planar surface after forming the first electrode, the first conductive channel, and the first repair electrode of some embodiments of the present disclosure is shown as follows, Figure 6E As shown, the first electrode 131A of the first light emitting region LA and the first electrode 131B of the second light emitting region LB are spaced apart from each other and respectively extend out a first conductive channel a1, a2 to connect to the first repair electrode 141. The first repair electrode 141 serves as a junction of the first electrodes of each light emitting region and is in contact with the first connection part M1 exposed at the first opening K1, thereby being conductive.

[0080] Further, a pixel definition layer 120 is formed. For example, Figure 6E A schematic diagram of the openings of the pixel definition layer 120 of some embodiments of the present disclosure is shown as follows, Figure 6E As shown, the pixel definition layer 120 includes a first pixel sub-opening 121A, a second pixel sub-opening 121B, and a third opening 123, in Figure 6FThe first pixel sub-opening 121A is located within the boundary range of the first electrode 131A on the substrate 100, i.e., at least part of the first electrode 131A of the first light emitting region LA is exposed. The second pixel sub-opening 121B is located within the boundary range of the first electrode 131B on the substrate 100, i.e., at least part of the first electrode 131B of the second light emitting region LB is exposed. The third opening 123 is located in a region other than the first light emitting region LA and the second light emitting region LB, and exposes the second opening K2, thereby exposing the second connecting portion M2.

[0081] Further, the first light emitting layer is formed. For example, Figure 6F A plan view schematic diagram after the first light emitting layer is formed in some embodiments of the present disclosure is shown as follows: Figure 6G As shown, the first light emitting layer 132 can cover the first light emitting region LA and the second light emitting region LB, i.e., the first light emitting layer 132 of the first light emitting region LA and the second light emitting region LB can be common.

[0082] Further, the second conductive film layer for preparing the intermediate electrode is formed, and the second conductive film layer is subjected to a patterning process to form the intermediate electrode, the second conductive channel and the second repair electrode of each light emitting region. For example, Figure 6G A plan view schematic diagram after the intermediate electrode, the second conductive channel and the second repair electrode are formed in some embodiments of the present disclosure is shown as follows: Figure 6H As shown, the intermediate electrode 133A of the first light emitting region LA and the intermediate electrode 133B of the second light emitting region LB are spaced from each other, and each extends a second conductive channel b1, b2 to connect to the second repair electrode 142. The second repair electrode 142 serves as the intersection of the intermediate electrodes of each light emitting region, and contacts the second connecting portion M2 exposed at the third opening 123 and the second opening K2, thereby being conductive.

[0083] Further, the second light emitting layer is formed. For example, Figure 6H A plan view schematic diagram after the second light emitting layer is formed in some embodiments of the present disclosure is shown as follows: Figure 6H As shown, the second light emitting layer 134 covers the first light emitting region LA and the second light emitting region LB, i.e., the second light emitting layer 134 of the first light emitting region LA and the second light emitting region LB can also be common, and on the other hand, also covers the second conductive channel (b1, b2), the second repair electrode 142 and the third opening 123. For example, the planar shape of the second light emitting layer 134 in a single pixel region can be as shown in the following figure: Figure 2The "convex" shape in the "convex" shape, the second conductive channel (b1, b2), the second maintenance electrode 142 and the third opening are shielded 123 to prevent the second electrode formed subsequently from being directly connected to the intermediate electrode, resulting in short circuit (Short).

[0084] Further, the second electrode is formed. For example, as shown in Figure 7 the first light emitting area LA and the second light emitting area LB can be connected to each other. For example, the second electrodes of the respective light emitting devices can also be connected to each other.

[0085] In some embodiments, one of the above-mentioned first light emitting layer and second light emitting layer can be an organic light emitting layer, and the other can be a quantum dot light emitting layer. The luminous intensity of the organic light emitting layer is positively correlated with the voltage difference between its anode and cathode; while the light emitting waveband of the quantum dot light emitting layer is a non-continuous waveband, and is related to the voltage difference between its anode and cathode, that is, under the action of different voltage differences, the light emitting color point of the quantum dot light emitting layer is different, that is, the type of light emitting quantum dots is different and different colors of light are emitted. In this way, the first light emitting layer and the second light emitting layer can be controlled by the pixel circuit to display different colors in time within a frame, and finally color display can be realized through color mixing.

[0086] For example, the organic light emitting layer emits light of a first color, and the quantum dot light emitting layer includes first quantum dots and second quantum dots, which are configured to be excited to emit light of different colors, respectively. For example, the first quantum dots can be excited to emit light of a second color, and the second quantum dots can be excited to emit light of a third color. For example, the first color can be blue, and the second color and the third color can be red and green, respectively. It should be noted that the colors of the light of the first color, the light of the second color and the light of the third color are not limited to the above-mentioned colors, and the types of the three colors can be adjusted according to specific needs.

[0087] Of course, the first light emitting layer and the second light emitting layer can also be quantum dot light emitting layers, which are not limited in the present embodiment.

[0088] Taking the first light emitting layer as an organic light emitting layer and the second light emitting layer as a quantum dot light emitting layer as an example, Figure 7 a cross-sectional schematic view of a single light emitting area of some embodiments of the present disclosure is shown. As shown in Figure 8 the single light emitting area includes a first electrode 131, a first light emitting layer 132, an intermediate electrode 133, a second light emitting layer 134 and a second electrode 135, which are sequentially stacked from bottom to top. The first light emitting layer 132 is an organic light emitting layer, and the second light emitting layer 134 is a quantum dot light emitting layer, which includes first quantum dots Q1 and second quantum dots Q2.

[0089] For each light emitting region, the first electrode 131, the first light emitting layer 132 and the intermediate electrode 133 can constitute a first light emitting sub-element EL1, and the intermediate electrode 133, the second light emitting layer 134 and the second electrode 135 can constitute a second light emitting sub-element EL2. The first light emitting sub-element EL1 and the second light emitting sub-element EL2 are connected in series.

[0090] For example, the light emitting device is divided into a first light emitting region and a second light emitting region, Figure 8 An equivalent circuit diagram of the light emitting device of a single pixel region is shown for some embodiments of the present disclosure. As Figure 9 shown, two light emitting regions can form four light emitting sub-elements, which are the first light emitting sub-elements EL11, EL12 and the second light emitting sub-elements EL21, EL22 respectively. Among them, the first light emitting sub-element EL11 and the second light emitting sub-element EL21 correspond to the first light emitting region, and the first light emitting sub-element EL12 and the second light emitting sub-element EL22 correspond to the second light emitting region. The first light emitting sub-elements EL11, EL12 and the second light emitting sub-elements EL21, EL22 constitute two parallel branches, one of which is the first light emitting sub-element EL11 and the second light emitting sub-element EL21 connected in series, and the other is the first light emitting sub-element EL12 and the second light emitting sub-element EL22 connected in series.

[0091] The anodes of the first light emitting sub-elements EL11 and EL12 can be connected together through the first conductive channels a1 and a2 and the first repair electrode 141, and connected to the first voltage control end to receive the first control voltage VDC1. The connection node N1_1 between the first light emitting sub-element EL11 and the second light emitting sub-element EL21 is the intermediate electrode 133 of the first light emitting region LA, and the connection node N1_2 between the first light emitting sub-element EL12 and the second light emitting sub-element EL22 is the intermediate electrode 133 of the second light emitting region LB. The connection node N1_1 and the connection node N1_2 can be connected together through the second conductive channels b1 and b2 and the second repair electrode 142, and connected to the second voltage control end to receive the second control voltage. The cathodes of the second light emitting sub-elements EL21 and EL22 are connected together and connected to the third voltage control end to receive the third control voltage VDC2.

[0092] For example, Figure 9 A circuit diagram of a pixel circuit of a display substrate 10 is shown for some embodiments of the present disclosure. As Figure 9As shown, the pixel circuit 200 includes a first driving sub-circuit 1A and a second driving sub-circuit 1B, the output terminals of the first driving sub-circuit 1A and the second driving sub-circuit 1B being the aforementioned second voltage control terminal. For each pixel area's pixel circuit 200, the first driving sub-circuit 1A is configured to control the magnitude of the driving current flowing through the first light-emitting sub-element in each light-emitting area, and the second driving sub-circuit 1B is configured to control the magnitude of the driving current flowing through the second light-emitting sub-element in each light-emitting area.

[0093] like Figure 9 As shown, for example, the pixel circuit 200 provided in some embodiments of this disclosure may further include: a first data writing sub-circuit 2A and a second data writing sub-circuit 2B. The first data writing sub-circuit 2A is configured to write a first data signal Data1 to the control terminal of the first driving sub-circuit 1A in response to a first data scan signal Gate1. The first driving sub-circuit 1A is configured to control the magnitude of the driving current flowing through the first light-emitting sub-elements EL11 and EL12 according to the first data signal Data1. The second data writing sub-circuit 2B is configured to write a second data signal Data2 to the control terminal of the second driving sub-circuit 1B in response to a second data scan signal Gate2. The second driving sub-circuit 1B is configured to control the magnitude of the driving current flowing through the second light-emitting element EL2 according to the second data signal Data2, so as to realize that writing the first data signal Data1 to the control terminal of the first driving sub-circuit 1A is used to control the magnitude of the driving current flowing through the first light-emitting element EL1, and writing the second data signal Data2 to the control terminal of the second driving sub-circuit 1B is used to control the magnitude of the driving current flowing through the second light-emitting sub-elements EL21 and EL22.

[0094] like Figure 9 As shown, for example, the pixel circuit 200 further includes a first storage sub-circuit 3A and a second storage sub-circuit 3B. A first data writing sub-circuit 2A is connected to a first terminal of the first storage sub-circuit 3A and configured to transmit a first data signal Data1 to the first terminal of the first storage sub-circuit 3A in response to a first data scan signal Gate1. A first driving sub-circuit 1A includes a control terminal, a first terminal, and a second terminal. The control terminal of the first driving sub-circuit 1A is connected to the first terminal of the first storage sub-circuit 3A. The first terminal of the first driving sub-circuit 1A is configured to receive a first power supply voltage VDD. The second terminals of the first driving sub-circuit 1A and the second terminal of the first storage sub-circuit 3A are connected to a first node N1. The first node N1 is the output terminal of the pixel circuit 200, i.e., it serves as the aforementioned second voltage control terminal, and is connected to the connection node N1_1 between the first light-emitting sub-element EL11 and the second light-emitting sub-element EL21, and the connection node N1_2 between the first light-emitting sub-element EL12 and the second light-emitting sub-element EL22.

[0095] The second data write-in sub-circuit 2B is connected with the first end of the second storage sub-circuit 3B, and is configured to transmit the second data signal Data2 to the first end of the second storage sub-circuit 3B in response to the second data scanning signal Gate2; the second drive sub-circuit 1B includes a control end, a first end and a second end, the control end of the second drive sub-circuit 1B is connected with the first end of the second storage sub-circuit 3B, the first end of the second drive sub-circuit 1B is configured to receive the second power supply voltage VSS, and the second end of the second drive sub-circuit 1B is connected with the first node N1; the second end of the second storage sub-circuit 3B is connected with the first end of the second drive sub-circuit 1B to receive the second power supply voltage VSS. In this way, the first data signal Data1 written into the control end of the first drive sub-circuit 1A by the first data write-in circuit 2A can be stored in the first storage sub-circuit 3A to generate a drive current for driving the first light emitting sub-elements EL11 and EL12 to emit light according to the first data signal Data1 in a light emitting stage, for example, and the second data signal Data2 written into the control end of the second drive sub-circuit 1B by the second data write-in circuit 2B can be stored in the second storage sub-circuit 3B to generate a drive current for driving the second light emitting sub-elements EL21 and EL22 to emit light according to the second data signal Data2 in a light emitting stage, for example.

[0096] For example, the first power supply voltage is a high power supply voltage VDD, and the second power supply voltage is a low power supply voltage VSS. For example, the second power supply voltage end is a ground end.

[0097] For example, the first drive sub-circuit 1A includes a first drive transistor T2, and the first storage sub-circuit 3A includes a first storage capacitor C1. The gate of the first drive transistor T2 is connected with the first electrode of the first storage capacitor C1. The first electrode of the first drive transistor T2 is configured to receive a first power voltage VDD, and the second electrode of the first drive transistor T2 is connected with the second electrode of the first storage capacitor C1, both of which are connected with the first node N1. The first drive transistor T2 is configured to control a current for driving the first light emitting sub-elements EL11 and EL12 to emit light under the control of the voltage of the gate of the first drive transistor T2. The second drive sub-circuit 1B includes a second drive transistor T4, and the second storage sub-circuit 3B includes a second storage capacitor C2. The gate of the second drive transistor T4 is connected with the first electrode of the second storage capacitor C2, the first electrode of the second drive transistor T4 is configured to receive a second power voltage VSS, and the second electrode of the second drive transistor T4 is connected with the first node N1. The second drive transistor T4 is configured to control a current for driving the second light emitting sub-elements EL21 and EL22 to emit light under the control of the voltage of the gate of the second drive transistor T4; the second electrode of the second storage capacitor C2 is connected with the first electrode of the second drive transistor T4. In this way, the first data signal Data1 is stored in the first storage capacitor C1, and the second data signal Data2 is stored in the second storage capacitor C2.

[0098] For example, the first data write sub-circuit 2A includes a first data transistor T1, the first electrode of the first data transistor T1 is connected with the first electrode of the first storage capacitor C1 and the gate of the first drive transistor T2, the second electrode of the first data transistor T1 is configured to receive the first data signal Data1, and the first data transistor T1 is configured to write the first data signal Data1 to the gate of the first drive transistor T2 and the first storage capacitor C1 in response to the first data scan signal Gate1; the second data write sub-circuit 2B includes a second data transistor T5, the first electrode of the second data transistor T5 is connected with the first electrode of the second storage capacitor C2 and the gate of the second drive transistor T4, the second electrode of the second data transistor T5 is configured to receive the second data signal Data2, and the second data transistor T5 is configured to write the second data signal Data2 to the gate of the second drive transistor T4 and the second storage capacitor C2 in response to the second data scan signal Gate2.

[0099] As Figure 9As shown, for example, the pixel circuit 200 further comprises a first sensing sub-circuit 4A and a first sensing signal line SENSE1, a first end of the first sensing sub-circuit 4A is connected to the first node N1, a control end of the first sensing sub-circuit 4A is configured to receive a first sensing scan signal Gate3, a second end of the first sensing sub-circuit 4A is connected to the first sensing signal line SENSE1, the first sensing signal line SENSE1 is connected to a first external detection circuit (not shown in the figure), the first sensing sub-circuit 4A is configured to detect, in response to the first sensing scan signal Gate3, an electrical characteristic of the pixel circuit 200 of the sub-pixel to which the first sensing sub-circuit 4A belongs by the first external detection circuit to achieve external compensation. The electrical characteristic, for example, includes at least one of a threshold voltage and / or a carrier mobility of the first drive transistor T2, a threshold voltage and / or a carrier mobility of the second drive transistor T4, a driving current of the first light emitting sub-element EL11, EL12 and / or the second light emitting sub-element EL21, EL22. The first external detection circuit, for example, can be a conventional circuit including a digital-to-analog converter (DAC) and an analog-to-digital converter (ADC) and the like.

[0100] As shown, for example, the first sensing sub-circuit 4A comprises a first sensing transistor T3, a first electrode of the first sensing transistor T3 is connected to the first node N1, a second electrode of the first sensing transistor T3 is connected to the first sensing signal line SENSE1 to be connected to the first external detection circuit, a gate of the first sensing transistor T3 is configured to receive the first sensing scan signal Gate3, the first sensing transistor T3 is configured to detect, in response to the first sensing scan signal Gate3, the electrical characteristic of the pixel circuit 200 of the sub-pixel to which the first sensing transistor T3 belongs by the first external detection circuit to achieve external compensation. Figure 9

[0101] For example, the pixel circuit 200 further comprises a second sensing sub-circuit 4B and a second sensing signal line SENSE2. A first end of the second sensing sub-circuit 4B is connected to the first node N1, a control end of the second sensing sub-circuit 4B is configured to receive a second sensing scan signal Gate4, a second end of the first sensing sub-circuit 4A is connected to the second sensing signal line SENSE2, the second sensing signal line SENSE2 is connected to a second external detection circuit (not shown in the figure), for example, the second external detection circuit has similar structure and function to the first external detection circuit; the second sensing sub-circuit 4B is configured to detect, in response to the second sensing scan signal Gate4, the electrical characteristic of the pixel circuit 200 of the sub-pixel to which the second sensing sub-circuit 4B belongs by the second external detection circuit to achieve external compensation.

[0102] As shown, for example, the first sensing sub-circuit 4A comprises a first sensing transistor T3, a first electrode of the first sensing transistor T3 is connected to the first node N1, a second electrode of the first sensing transistor T3 is connected to the first sensing signal line SENSE1 to be connected to the first external detection circuit, a gate of the first sensing transistor T3 is configured to receive the first sensing scan signal Gate3, the first sensing transistor T3 is configured to detect, in response to the first sensing scan signal Gate3, the electrical characteristic of the pixel circuit 200 of the sub-pixel to which the first sensing transistor T3 belongs by the first external detection circuit to achieve external compensation. Figure 10 ​As shown, for example, the second sensing sub-circuit 4B includes a second sensing transistor T6, a first electrode of the second sensing transistor T6 is connected with the first node N1, a second electrode of the second sensing transistor T6 is connected with the second sensing signal line SENSE2 to be connected to the second external detection circuit. A gate electrode of the second sensing transistor T6 is configured to receive a second sensing scan signal Gate4, and the second sensing transistor T6 is configured to detect, in response to the second sensing scan signal Gate4, the electrical characteristics of the pixel circuit 200 of the sub-pixel to which the second sensing transistor T6 belongs through the second external detection circuit to achieve external compensation.

[0103] A first electrode of the second sensing transistor T6 is connected with the first node N1, a second electrode of the second sensing transistor T6 is connected with the second sensing signal line SENSE2 to be connected to the second external detection circuit. A gate electrode of the second sensing transistor T6 is configured to receive a second sensing scan signal Gate4, and the second sensing transistor T6 is configured to detect, in response to the second sensing scan signal Gate4, the electrical characteristics of the sub-pixel to which the second sensing transistor T6 belongs through the second external detection circuit to achieve external compensation.

[0104] The transistors employed in the embodiments of the present disclosure can all be thin film transistors or field effect transistors or other switching devices with the same characteristics, and the embodiments of the present disclosure are all described by taking thin film transistors as examples. The source and drain electrodes of the transistors employed herein can be symmetrical in structure, so that the source and drain electrodes thereof can be indistinguishable in structure. In the embodiments of the present disclosure, in order to distinguish the two electrodes of the transistors other than the gate electrode, one of the two electrodes is directly described as the first electrode and the other is directly described as the second electrode. In addition, the transistors can be divided into N-type and P-type transistors according to their characteristics. When the transistor is a P-type transistor, the on voltage is a low-level voltage (for example, 0V, -5V, -10V or other suitable voltage), and the off voltage is a high-level voltage (for example, 5V, 10V or other suitable voltage); when the transistor is an N-type transistor, the on voltage is a high-level voltage (for example, 5V, 10V or other suitable voltage), and the off voltage is a low-level voltage (for example, 0V, -5V, -10V or other suitable voltage). It should be noted that in the following description, the transistors in the embodiments of the present disclosure are all described by taking N-type transistors as examples, but not as a limitation of the present disclosure. Figure 2

[0105] ​Some embodiments of the present disclosure also provide a control method of the pixel circuit 200, which comprises: controlling the first light emitting sub-elements EL11, EL12 and the second light emitting sub-elements EL21, EL22 to emit light in different time periods respectively, wherein a display time period of one frame of image comprises at least two time periods, the at least two time periods comprise a first time period and a second time period, at least the first light emitting sub-elements EL11, EL12 emit light of a first color in the first time period, and at least the second light emitting sub-elements EL21, EL22 emit light of a second color in the second time period. In the control method of the pixel circuit 200, the first light emitting sub-elements EL11, EL12 and the second light emitting sub-elements EL21, EL22 are driven to emit light in time division, so that the first light emitting sub-elements EL11, EL12 and the second light emitting sub-elements EL21, EL22 emit light of two colors respectively in the at least two time periods, to realize color display.

[0106] In some embodiments, the pixel circuit 200 can control the first light emitting sub-elements EL11, EL12 and the second light emitting sub-elements EL21, EL22 to emit light in two time periods to display a color image. At this time, one frame of image comprises a first time period and a second time period, for example, one frame of image is divided into two time periods of the first time period and the second time period; for example, the first time period is 1 / 2 frame in advance and the second time period is 1 / 2 frame in advance, in which case the light emitting time of various colors is basically the same, which is conducive to obtaining better color display effect and reducing the difficulty of control. Of course, it is not limited to this case, and the time lengths of the first time period and the second time period can also be unequal. Since one frame of display image only needs to be split into two parts, i.e., two stages (for example, 1 / 2 frame in advance and 1 / 2 frame in advance), high refresh frequency is more easily realized, and display effect is improved.

[0107] For example, the light emitting layer of the first light emitting sub-elements EL11, EL12 is an organic light emitting layer, i.e., an organic light emitting diode; the light emitting layer of the second light emitting sub-elements EL21, EL22 is a quantum dot light emitting layer, which comprises first quantum dots and second quantum dots, i.e., a quantum dot light emitting diode. Then, in the first time period, the first light emitting sub-elements EL11, EL12 can be controlled to emit light of a first color, and the first quantum dots in the second light emitting sub-elements EL21, EL22 can be controlled to emit light of a second color; in the second time period, the second quantum dots in the second light emitting sub-elements EL21, EL22 can be controlled to emit light of a third color. Correspondingly, the control method of the pixel circuit 200 described above can comprise: in the first time period, writing a first data signal Data1 for controlling the gray scale of the first color and the gray scale of the second color; and in the second time period, writing a second data signal Data2 for controlling the gray scale of the third color.

[0108] The display process of the first time period includes a first data writing and resetting stage and a first light emitting stage, in which the first light emitting sub-elements EL11, EL12 and the second light emitting sub-elements EL21, EL22 all emit light, for example, simultaneously, and the light emitting of both is controlled by the first data signal Data1, that is, the gray scale of the first color and the gray scale of the second color are both controlled by the first data signal Data1. After the first time period, the display process of the second time period can include a second data writing and resetting stage and a second light emitting stage. In the second light emitting stage, the light emitting of the second light emitting sub-elements EL21, EL22 is controlled by the second data signal Data2, that is, the gray scale of the third color is controlled by the second data signal Data2.

[0109] At this time, the first voltage control terminal and the third voltage control terminal can also be different voltage terminals, and the first control voltage and the third control voltage are different voltage signals from different voltage terminals. In this way, it is easier to obtain different ranges of voltage difference to control the light emitting of the first light emitting sub-elements EL11, EL12 (organic light emitting diodes) and the second light emitting sub-elements EL21, EL22 (quantum dot light emitting diodes) respectively.

[0110] In some embodiments, the pixel circuit 200 can also control the light emitting of the first light emitting sub-elements EL11, EL12 and the second light emitting sub-elements EL21, EL22 in three time periods to display a color image. For example, a frame of image includes a first time period, a second time period and a third time period, for example, a frame of image is divided into three time periods of a first time period, a second time period and a third time period; for example, here taking the first time period as the first 1 / 3 frame, the second time period as the second 1 / 3 frame and the third time period as the third 1 / 3 frame as an example, in which case the light emitting time of various colors is basically the same, which is conducive to obtaining better color display effect and reducing the difficulty of control. Of course, it is not limited to this case, and the time lengths of the first time period, the second time period and the third time period can also be unequal.

[0111] For example, in the first time period, the first light emitting sub-elements EL11, EL12 can be controlled to emit light of the first color; in the second time period, the first quantum dots in the second light emitting sub-elements EL21, EL22 can be controlled to emit light of the second color; and in the third time period, the second quantum dots in the second light emitting sub-elements EL21, EL22 can be controlled to emit light of the third color. Correspondingly, the control method of the pixel circuit 200 described above can include: in the first time period, writing the first data signal Data1 for controlling the gray scale of the first color; and in the second time period and the third time period, writing the second data signal Data2 for controlling the gray scale of the second color and the third color respectively.

[0112] The display process of the first time period includes a first data writing and resetting stage and a first light emitting stage. The working process or control method of the pixel circuit 200 includes the following steps. In the first data writing and resetting stage, the second control signal Gate2 (i.e. the second data scanning signal Gate2, which is referred to as the second control signal hereinafter for convenience of description) is a closing signal, the first control signal Gate1 (i.e. the first data scanning signal Gate1, which is referred to as the first control signal hereinafter for convenience of description) and the third control signal Gate3 (i.e. the first sensing scanning signal Gate3, which is referred to as the third control signal hereinafter for convenience of description) are both opening signals, the first data writing transistor T1 and the first sensing transistor T3 are both turned on, the first data signal Data1 is transmitted to the gate of the first driving transistor T2 through the first data writing transistor T1, the first reset signal Sense1 is written to the intermediate electrode (e.g. the cathode of the first light emitting sub-element EL11, EL12) through the first sensing signal line SENSE1 and the first sensing transistor T3, for example, by an analog-to-digital converter, the first driving transistor T2 is turned on and generates a driving current to charge the intermediate electrode of the first light emitting sub-element EL11, EL12 to a working voltage. In the first light emitting stage, the second control signal Gate2, the first control signal Gate1 and the third control signal Gate3 are all closing signals. Due to the bootstrap effect of the first storage capacitor C1, the first driving transistor T2 remains turned on and works in a saturation state with a constant current. At this time, the first control voltage VDC1 is controlled to make the voltage difference between the first electrode and the intermediate electrode VDC1-VN1>VEL1 (the starting light voltage of the first light emitting sub-element EL11, EL12), so as to drive the first light emitting sub-element EL11, EL12 to emit light and generate a first driving current CR1 through the first driving transistor T2 and the first light emitting sub-element EL11, EL12. At the same time, in the first light emitting stage, the third control voltage VDC2 is controlled to make the voltage difference between the intermediate electrode and the second electrode VN1-VDC2<VEL2 (the starting light voltage of the second light emitting sub-element EL21, EL22), so as to make the second light emitting sub-element EL21, EL22 not emit light. In this way, only the first light emitting sub-element EL11, EL12 emits light in the first light emitting stage, for example, the first light emitting sub-element EL11, EL12 emits light of the first color, and the light emitting condition of the first light emitting sub-element EL11, EL12 is controlled by the first data signal Data1, i.e. the gray scale of the first color is controlled by the first data signal Data1.

[0113] The display process of the second time period includes a second data writing and resetting stage and a second light emitting stage. In the second data writing and resetting stage, the first control signal Gate1 is a closing signal, the second control signal Gate2 and the fourth control signal Gate4 are both opening signals, the second data writing transistor T5 and the second sensing transistor T6 are both turned on, the second data signal Data2 is transmitted to the gate of the second driving transistor T4 through the second data writing transistor T5, and for example, the first reset signal Sense1 is written to the intermediate electrode (for example, the anode of the second light emitting sub-element EL21, EL22) through the second sensing signal line SENSE2 and the second sensing transistor T6 by the second external detection circuit.

[0114] In the second light emitting stage, the first control signal Gate1, the second control signal Gate2 and the fourth control signal Gate4 are all closing signals, and due to the bootstrap effect of the second storage capacitor C2, the second driving transistor T4 remains turned on. At this time, the third control voltage VDC2 is controlled so that VN1-VDC2>VEL2, so that the second light emitting sub-element EL21, EL22 emits light, and a second driving current passing through the second driving transistor T4 and the second light emitting sub-element EL21, EL22 is generated; for example, the second light emitting sub-element EL21, EL22 emits light of a second color in the second light emitting stage, and the second color is different from the first color. In this way, in the second time period, the light emitting of the second light emitting sub-element EL21, EL22 is controlled by the second data signal Data2, that is, the gray scale of the second color is controlled by the second data signal Data2.

[0115] In the second light emitting stage, the light emitting wavelength band of the second light emitting sub-element EL21, EL22 (for example, a quantum dot light emitting diode) is selected by controlling the third control voltage VDC2, and the voltage difference VN1-VDC2 between the anode and the cathode of the quantum dot light emitting diode is controlled in the second range to control the second quantum dot to emit light of a second color; for example, in the second light emitting stage, the wavelength band of the light of the second color of the quantum dot light emitting diode is turned on to make it emit light of the second color. For example, in the second light emitting stage, the light of the second color is red light.

[0116] In the third period after the second period, the display process of the third period includes a third data write and reset stage and a third light emitting stage. The working process (control method) of the pixel circuit 200 further includes the following steps. In the third data write and reset stage, the first control signal Gate1 is a closing signal, the second control signal Gate2 and the fourth control signal Gate4 are both opening signals, the second data write transistor T5 and the second sensing transistor T6 are both turned on, and the second data signal Data2 is transmitted to the gate of the second driving transistor T4 through the second data write transistor T5, for example, the first reset signal Sense1 is written to the intermediate electrode (for example, the anode of the second light emitting sub-element EL21, EL22) through the second sensing signal line SENSE2 and the second sensing transistor T6 by the second external detection circuit.

[0117] In the third light emitting stage, the first control signal Gate1, the second control signal Gate2 and the fourth control signal Gate4 are all closing signals, and due to the bootstrap effect of the second storage capacitor C2, the second driving transistor T4 remains turned on. At this time, the third control voltage VDC2 is controlled so that VN1-VDC2>VEL2, so that the second light emitting sub-element EL21, EL22 emits light, and a third driving current passing through the second driving transistor T4 and the second light emitting sub-element EL21, EL22 is generated; for example, the second light emitting sub-element EL21, EL22 emits light of a third color in the third light emitting stage, and the third color is different from both the first color and the second color.

[0118] Thus, in the third period, the light emitting of the second light emitting sub-element EL21, EL22 is also controlled by the second data signal Data2, that is, the gray scale of the third color is also controlled by the second data signal Data2. In the third light emitting stage, the light emitting wavelength band of the second light emitting sub-element EL21, EL22, i.e., the quantum dot light emitting diode, is selected by controlling the third control voltage VDC2, the voltage difference VN1-VDC2 between the anode and the cathode of the quantum dot light emitting diode is controlled in the third range to control the second quantum dot to emit light of the third color; for example, in the third light emitting stage, the wavelength band of the light of the third color of the quantum dot light emitting diode is turned on to make it emit light of the third color. For example, in the third light emitting stage, the light of the third color is green light.

[0119] It should be noted that the first color, the second color and the third color are not limited to the types listed, and the types of the three colors can be adjusted according to specific needs.

[0120] At this time, the first voltage control terminal and the third voltage control terminal can be the same voltage terminal, and the first control voltage and the third control voltage are voltage signals from the same voltage terminal. Since the first light emitting sub-element and the second light emitting sub-element are time-sharing light emitting, that is, the period of adjusting the voltage difference between the anode and the cathode of the first light emitting sub-element EL11, EL12 is different from the period of adjusting the voltage difference between the anode and the cathode of the second light emitting sub-element EL21, EL22, and they are independent, the same voltage control terminal can realize the above requirements for the two voltage differences, so as to simplify the structure of the pixel circuit 200 and simplify the control method.

[0121] Next, still taking the case of dividing the light emitting device into the first light emitting area LA and the second light emitting area LB, the repair process when the Particle defect occurs in the stacked light emitting device is described.

[0122] For example, Figure 10 It is shown Figure 11 The repair schematic diagram of the Particle defect in the first light emitting layer in the second light emitting area LB is shown. As shown in Figure 7 When it is monitored that the Particle (PT for short) defect exists in the second light emitting area LB, the first conductive channel and the second conductive channel connected to the second light emitting area LB can be cut by laser cutting, so as to be disconnected from the normally displayed first light emitting area LA, thereby not affecting the display of the first light emitting area LA. Subsequently, the light that cannot be emitted by the second light emitting area LB can be compensated by the first light emitting area LA, for example, the luminance of the first light emitting area LA is adjusted to be consistent with the luminance of the preset reference pixel, so as to realize normal display, thereby improving the yield and providing technical support for the ultra-high PPI product.

[0123] In the case where the light emitting layer is two layers and at least one layer is a quantum dot light emitting layer, the light emitting device is field-continuing light emitting, that is, time-sharing light emitting. In some application scenarios, if the Particle generating layer such as the first light emitting layer or the second light emitting layer can be located by capturing pictures through the device, the abnormal light emitting sub-element in the light emitting area with the Particle defect can be more accurately cut off, without the need to completely isolate the light emitting area, which is beneficial to save the repair time and delay the aging speed of the light emitting device.

[0124] For example, Figure 12 It is shown Figure 2 The schematic diagram of the Particle defect in the first light emitting layer is shown, Figure 11 It is shown Figure 13 The repair schematic diagram of the Particle defect in the first light emitting layer of the second light emitting area LB is shown. Referring to Figure 7 and 12When only the first light-emitting layer of the second light-emitting area LB has the Particle, the anode and the cathode of the first light-emitting layer are short-circuited and cannot normally emit light, while the second light-emitting layer can normally emit light. At this time, the normal display of the first light-emitting layer of the second light-emitting area LB and other light-emitting areas can be realized by laser cutting the first conductive channel of the second light-emitting area LB. Subsequently, the light that cannot be emitted by the second light-emitting layer of the second light-emitting area LB is compensated by the first light-emitting area LA which can normally display.

[0125] For example, Figure 14 It is shown that Figure 2 The second light-emitting layer of the second light-emitting area LB has a Particle defect, and a repair schematic diagram is shown. Figure 13 It is shown that Figure 15 The second light-emitting layer of the second light-emitting area LB has a Particle defect, and a repair schematic diagram is shown. Figure 15 And 14 When only the second light-emitting layer has a Particle defect, the anode and the cathode of the second light-emitting layer are short-circuited and cannot normally emit light, while the first light-emitting layer can normally emit light. At this time, the normal display of the first light-emitting layer of the second light-emitting area LB and other light-emitting areas can be realized by laser cutting the second conductive channel of the second light-emitting area LB. Subsequently, the light that cannot be emitted by the second light-emitting layer of the second light-emitting area LB is compensated by the first light-emitting area LA which can normally display.

[0126] ​ A schematic diagram of a display device provided by some embodiments of the present disclosure is shown. As shown in ​ The display device 20 provided by at least one embodiment of the present disclosure includes any one of the display substrates 10 provided by the embodiments of the present disclosure. The display device 20 may, for example, be a display panel, a display, an OLED panel, an OLED television, electronic paper, a mobile phone, a tablet computer, a notebook computer, a digital photo frame, a navigator, or any product or component having a display function. Of course, the display device 20 provided by the embodiments of the present disclosure is not limited to the types listed above.

[0127] It should be further noted that the drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can be referred to the general design. In the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0128] Although some embodiments of the present disclosure have been described, those skilled in the art can make additional changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present disclosure.

Claims

1. A display substrate, characterized in that, include: The substrate includes multiple pixel regions; A light-emitting device layer is disposed on one side of the substrate, and the light-emitting device layer includes a plurality of light-emitting devices, each of which is disposed in a pixel region; Each of the light-emitting devices includes at least two spaced-apart light-emitting regions, and each light-emitting region includes a first electrode, at least two light-emitting layers, and a second electrode stacked on the substrate. An intermediate electrode is disposed between adjacent light-emitting layers. For the same light-emitting device, the first electrodes of each light-emitting region are isolated from each other and connected to the same first voltage control terminal through independent first conductive channels. The intermediate electrodes of each light-emitting region are isolated from each other and connected to the same second voltage control terminal through independent second conductive channels. The display substrate further includes: A first maintenance electrode and a second maintenance electrode are disposed in each of the pixel areas. In the same light-emitting device, the first electrode of each light-emitting area is connected to the first maintenance electrode through an independent first conductive channel, and each light-emitting area is connected to the second maintenance electrode through an independent second conductive channel. A pixel defining layer is disposed on the side of the first electrode away from the substrate. A connection metal layer disposed on the side of the first electrode near the substrate, the connection metal layer comprising: a first connection portion and a second connection portion; and A planarization layer is disposed between the connecting metal layer and the first electrode. The planarization layer has a first opening and a second opening. The first opening exposes at least a portion of the first connection portion. The first maintenance electrode is connected to the first voltage control terminal through the first connection portion exposed at the first opening. The pixel defining layer has a third opening. The second connection portion, the second opening, and the orthographic projection of the third opening on the substrate at least partially overlap to expose at least a portion of the second connection portion from the third opening. The second maintenance electrode is connected to the second voltage control terminal through the third opening and the second connection portion exposed at the second opening.

2. The display substrate according to claim 1, characterized in that, The first maintenance electrode, the first conductive channel, and the first electrode are arranged in the same layer, and the second maintenance electrode, the second conductive channel, and the intermediate electrode are arranged in the same layer.

3. The display substrate according to claim 1, characterized in that, The first repair electrode and the second repair electrode are located on opposite sides of their respective pixel areas, and the arrangement direction of the first repair electrode and the second repair electrode intersects with the arrangement direction of at least two of the light-emitting areas.

4. The display substrate according to claim 1, characterized in that, The pixel defining layer includes: a plurality of pixel openings and a blocking portion disposed in each of the pixel openings, the blocking portion dividing the pixel opening into at least two pixel sub-openings, each pixel sub-opening being configured to define a light-emitting region of the light-emitting device, and each pixel sub-opening exposing at least a portion of the first electrode of the corresponding light-emitting region.

5. The display substrate according to claim 1, characterized in that, The second electrodes of each of the light-emitting devices are interconnected. The light-emitting layer located between the intermediate electrode and the second electrode covers the intermediate electrode, as well as the second conductive channel, the second maintenance electrode, and the third opening, to prevent the second electrode from short-circuiting with the intermediate electrode.

6. The display substrate according to claim 1, characterized in that, The at least two light-emitting regions include: a first light-emitting region and a second light-emitting region, wherein the first electrodes of the first light-emitting region and the second light-emitting region are connected to the same first voltage control terminal through mutually independent first conductive channels, and the intermediate electrodes of the first light-emitting region and the second light-emitting region are connected to the same second voltage control terminal through mutually independent second conductive channels.

7. The display substrate according to claim 1, characterized in that, The at least two light-emitting layers include: a first light-emitting layer and a second light-emitting layer, wherein the intermediate electrode is disposed between the first light-emitting layer and the second light-emitting layer; At least one of the first light-emitting layer and the second light-emitting layer is a quantum dot light-emitting layer. The first light-emitting layer emits light under the action of a first voltage difference between the first electrode and the intermediate electrode, and the second light-emitting layer emits light under the action of a second voltage difference between the intermediate electrode and the second electrode.

8. The display substrate according to claim 7, characterized in that, One of the first light-emitting layer and the second light-emitting layer is an organic light-emitting layer, and the other is a quantum dot light-emitting layer; the organic light-emitting layer emits light of a first color; the quantum dot light-emitting layer includes a first quantum dot and a second quantum dot, the first quantum dot emits light of a second color, and the second quantum dot emits light of a third color.

9. The display substrate according to claim 7, characterized in that, For each of the light-emitting regions, the first electrode, the first light-emitting layer, and the intermediate electrode constitute a first light-emitting sub-element, and the intermediate electrode, the second light-emitting layer, and the second electrode constitute a second light-emitting sub-element, with the first light-emitting sub-element and the second light-emitting sub-element connected in series; The display substrate further includes a pixel circuit disposed on the side of the light-emitting device layer near the substrate. The pixel circuit includes a first driving sub-circuit and a second driving sub-circuit. The output terminals of the first driving sub-circuit and the second driving sub-circuit are the second voltage control terminals. The first driving sub-circuit is configured to control the magnitude of the driving current flowing through the first light-emitting sub-element of each light-emitting region. The second driving sub-circuit is configured to control the magnitude of the driving current flowing through the second light-emitting sub-element of each light-emitting region.

10. A display device, characterized in that, include: The display substrate according to any one of claims 1-9.

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