Display substrate and display apparatus

Abstract

A display substrate, comprising a base substrate, a plurality of cathode lines, a planarization layer, a pixel defining layer and a plurality of light-emitting elements, wherein the plurality of cathode lines are located on the base substrate; the planarization layer is located on the sides of the plurality of cathode lines that are away from the base substrate; and the pixel defining layer is located on the side of the planarization layer that is away from the plurality of cathode lines. The display substrate further comprises a plurality of conductive isolation columns, which are arranged corresponding to the plurality of light-emitting elements on a one-to-one basis, wherein each conductive isolation column is electrically connected to one cathode line; each light-emitting element comprises an anode, a light-emitting layer and a cathode; and the cathode of each light-emitting element is electrically connected to a corresponding conductive isolation column. Therefore, by means of the display substrate, different light-emitting elements can use independent cathodes and different cathode voltages are applied, such that each light-emitting element uses a suitable cathode voltage, thereby avoiding a redundant voltage and redundant power consumption, and thus reducing the overall power consumption of the display substrate.

Description

Display substrate and display device Technical Field

[0001] Embodiments of the present disclosure relate to a display substrate and a display device. Background Art

[0002] With the continuous development of display technology, organic light-emitting diode (OLED) displays have been widely used in various electronic products due to their advantages such as wide color gamut, high contrast, thin and light design, self-luminescence, and wide viewing angle. These products range from small electronic products such as smart bracelets, smart watches, smartphones, and tablets to large electronic products such as laptops, desktop computers, and televisions. As a result, the market demand for OLED displays is also growing rapidly.

[0003] Summary of the Invention

[0004] Embodiments of the present disclosure provide a display substrate and a display device. The cathodes of each light-emitting element in the display substrate can be connected to cathode lines below the flat layer via conductive isolation columns, allowing cathode voltages to be applied to the cathodes of each light-emitting element via the cathode lines below the flat layer. This arrangement allows different light-emitting elements to use independent cathodes and apply different cathode voltages, ensuring that each light-emitting element uses a suitable cathode voltage, avoiding redundant voltages and power consumption, thereby reducing the overall power consumption of the display substrate. Furthermore, the conductive isolation columns themselves can also provide a certain degree of isolation, preventing the cathodes of adjacent light-emitting elements from overlapping.

[0005] At least one embodiment of the present disclosure provides a display substrate, comprising: a base substrate; a plurality of cathode lines located on the base substrate; a planar layer located on a side of the plurality of cathode lines away from the base substrate; a pixel defining layer located on a side of the planar layer away from the plurality of cathode lines; and a plurality of light-emitting elements, wherein the display substrate further comprises a plurality of conductive isolation columns, which are arranged in a one-to-one correspondence with the plurality of light-emitting elements, each of the conductive isolation columns being electrically connected to one of the cathode lines, each of the light-emitting elements comprising an anode, a light-emitting layer and a cathode, and the cathode of each light-emitting element being electrically connected to the corresponding conductive isolation column.

[0006] For example, in a display substrate provided in one embodiment of the present disclosure, the display substrate further includes: a plurality of pixel driving circuits located on a side of the flat layer close to the base substrate, the plurality of pixel driving circuits being arranged in a one-to-one correspondence with the plurality of light-emitting elements, and the anode of each of the light-emitting elements being electrically connected to the output end of the corresponding pixel driving circuit.

[0007] For example, in the display substrate provided in one embodiment of the present disclosure, each of the conductive isolation columns is at least partially located on a side of the pixel defining layer away from the base substrate, and each of the conductive isolation columns is electrically connected to one of the cathode lines through a via hole passing through the pixel defining layer and the planar layer.

[0008] For example, in the display substrate provided by an embodiment of the present disclosure, each of the conductive isolation columns is partially located in a via hole of the pixel defining layer and the planar layer.

[0009] For example, in the display substrate provided in an embodiment of the present disclosure, the cathode of each light-emitting element overlaps the side surface of the corresponding conductive isolation column.

[0010] For example, in the display substrate provided by an embodiment of the present disclosure, the cathode of each light-emitting element is arranged in contact with the side surface of the corresponding conductive isolation column.

[0011] For example, in the display substrate provided in an embodiment of the present disclosure, the cathode of each of the light-emitting elements is connected to the side surface of the conductive isolation column through a conductive structure.

[0012] For example, in a display substrate provided in an embodiment of the present disclosure, the plurality of light-emitting elements include a first light-emitting element, a second light-emitting element and a third light-emitting element, the first light-emitting element includes a first anode, a first light-emitting layer and a first cathode, the second light-emitting element includes a second anode, a second light-emitting layer and a second cathode, the third light-emitting element includes a third anode, a third light-emitting layer and a third cathode, the first anode and the first cathode are configured to drive the first light-emitting layer to emit light of a first color, the second anode and the second cathode are configured to drive the second light-emitting layer to emit light of a second color, and the third anode and the third cathode are configured to drive the third light-emitting layer to emit light of a third color.

[0013] For example, in a display substrate provided in an embodiment of the present disclosure, the plurality of cathode lines include a first cathode line, a second cathode line, and a third cathode line, and the plurality of conductive isolation columns include a first conductive isolation column, a second conductive isolation column, and a third conductive isolation column, the first conductive isolation column is electrically connected to the first cathode line and the first cathode of the first light-emitting element, respectively, the second conductive isolation column is electrically connected to the second cathode line and the second cathode of the second light-emitting element, respectively, and the third conductive isolation column is electrically connected to the third cathode line and the third cathode of the third light-emitting element, respectively.

[0014] For example, in the display substrate provided by an embodiment of the present disclosure, the first cathode line, the second cathode line, and the third cathode line are configured to be loaded with different cathode voltages.

[0015] For example, in the display substrate provided in one embodiment of the present disclosure, the orthographic projection of the first conductive isolation column on the base substrate is located around the orthographic projection of the first light-emitting element on the base substrate, the orthographic projection of the second conductive isolation column on the base substrate is located around the orthographic projection of the second light-emitting element on the base substrate, and the orthographic projection of the third conductive isolation column on the base substrate is located around the orthographic projection of the third light-emitting element on the base substrate.

[0016] For example, in a display substrate provided in an embodiment of the present disclosure, the first color is red, the second color is green, and the third color is blue.

[0017] For example, in the display substrate provided in one embodiment of the present disclosure, the first light-emitting element further includes a first opening, which is located in the pixel defining layer, the first anode is located on a side of the pixel defining layer close to the base substrate and is exposed by the first opening, and the first light-emitting layer is at least partially located in the first opening to contact the first anode; the second light-emitting element further includes a second opening, which is located in the pixel defining layer, the second anode is located on a side of the pixel defining layer close to the base substrate and is exposed by the second opening, and the second light-emitting layer is at least partially located in the second opening to contact the second anode; the third light-emitting element further includes a third opening, which is located in the pixel defining layer, the third anode is located on a side of the pixel defining layer close to the base substrate and is exposed by the third opening, and the third light-emitting layer is at least partially located in the third opening to contact the third anode.

[0018] For example, in the display substrate provided in one embodiment of the present disclosure, the orthographic projection of the first conductive isolation column on the base substrate surrounds the orthographic projection of the first opening of the first light-emitting element on the base substrate, the orthographic projection of the second conductive isolation column on the base substrate surrounds the orthographic projection of the second opening of the second light-emitting element on the base substrate, and the orthographic projection of the third conductive isolation column on the base substrate surrounds the orthographic projection of the third opening of the third light-emitting element on the base substrate.

[0019] For example, in the display substrate provided in one embodiment of the present disclosure, the orthographic projection of the first conductive isolation column on the base substrate semi-surrounds the orthographic projection of the first opening of the first light-emitting element on the base substrate, the orthographic projection of the second conductive isolation column on the base substrate semi-surrounds the orthographic projection of the second opening of the second light-emitting element on the base substrate, and the orthographic projection of the third conductive isolation column on the base substrate semi-surrounds the orthographic projection of the third opening of the third light-emitting element on the base substrate. Only one conductive isolation column is arranged between adjacent first and second light-emitting elements, between adjacent second and third light-emitting elements, and between adjacent first and third light-emitting elements.

[0020] For example, in the display substrate provided in one embodiment of the present disclosure, the orthographic projection of the first conductive isolation column on the base substrate is located on one side of the orthographic projection of an edge of the first opening of the first light-emitting element on the base substrate, the orthographic projection of the second conductive isolation column on the base substrate is located on one side of the orthographic projection of an edge of the second opening of the second light-emitting element on the base substrate, and the orthographic projection of the third conductive isolation column on the base substrate is located on one side of the orthographic projection of an edge of the third opening of the third light-emitting element on the base substrate.

[0021] For example, in a display substrate provided in an embodiment of the present disclosure, the display substrate further includes: a first temporary encapsulation layer, located on a side of the first light-emitting element away from the base substrate; a second temporary encapsulation layer, located on a side of the second light-emitting element away from the base substrate; and a third temporary encapsulation layer, located on a side of the third light-emitting element away from the base substrate, wherein the first temporary encapsulation layer, the second temporary encapsulation layer and the third temporary encapsulation layer are independent of each other and are spaced apart from each other.

[0022] For example, in the display substrate provided in an embodiment of the present disclosure, the display substrate further includes: an encapsulation layer located on a side of the first temporary encapsulation layer, the second temporary encapsulation layer, and the third temporary encapsulation layer away from the base substrate.

[0023] For example, in the display substrate provided by an embodiment of the present disclosure, the orthographic projection of each of the conductive isolation pillars on the base substrate surrounds the orthographic projection of the corresponding light-emitting element on the base substrate.

[0024] For example, in the display substrate provided by an embodiment of the present disclosure, the orthographic projection of each of the conductive isolation pillars on the base substrate semi-encloses the orthographic projection of the corresponding light-emitting element on the base substrate.

[0025] For example, in the display substrate provided by an embodiment of the present disclosure, the orthographic projection of each of the conductive isolation pillars on the base substrate is located on one side of the orthographic projection of an edge of the corresponding light-emitting element on the base substrate.

[0026] For example, in the display substrate provided in an embodiment of the present disclosure, only one conductive isolation column is provided between two adjacent light-emitting elements.

[0027] For example, in a display substrate provided in an embodiment of the present disclosure, the display substrate further includes: a plurality of cathode connecting lines, each of the cathode connecting lines being electrically connected to at least two of the plurality of cathode lines, each of the cathode connecting lines being located in a first conductive layer and extending along a first direction, each of the cathode lines being located in a second conductive layer and extending along a second direction, and the first direction and the second direction intersecting.

[0028] For example, in a display substrate provided in an embodiment of the present disclosure, the plurality of cathode lines include a plurality of first cathode lines, a plurality of second cathode lines and a plurality of third cathode lines, the plurality of cathode connecting lines include a first cathode connecting line, a second cathode connecting line and a third cathode connecting line, two adjacent first cathode lines in the first direction are electrically connected to the same first cathode connecting line, two adjacent second cathode lines in the first direction are electrically connected to the same second cathode connecting line, and two adjacent third cathode lines in the first direction are electrically connected to the same third cathode connecting line.

[0029] For example, in the display substrate provided by an embodiment of the present disclosure, the first cathode connecting line, the second cathode connecting line and the third cathode connecting line are arranged along the second direction.

[0030] At least one embodiment of the present disclosure further provides a display device comprising any of the display substrates described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, rather than limiting the present disclosure.

[0032] FIG1A is a schematic structural diagram of a display substrate provided in one embodiment of the present disclosure.

[0033] FIG1B is a schematic diagram showing the connection between the cathode of another light-emitting element and the corresponding conductive isolation column provided by an embodiment of the present disclosure.

[0034] FIG2 is a schematic plan view of a display substrate provided in accordance with an embodiment of the present disclosure.

[0035] FIG3 is a schematic diagram of stacking of light-emitting elements and conductive isolation columns in a display substrate provided by an embodiment of the present disclosure.

[0036] FIG. 4 is a schematic diagram of a plurality of cathode lines in a display substrate provided by an embodiment of the present disclosure.

[0037] FIG5 is a schematic plan view of another display substrate provided by an embodiment of the present disclosure.

[0038] FIG6 is a schematic diagram of stacking light-emitting elements and conductive isolation columns in another display substrate provided by an embodiment of the present disclosure.

[0039] FIG. 7 is a schematic diagram of cathode lines in another display substrate provided by an embodiment of the present disclosure.

[0040] FIG8 is a schematic structural diagram of a display substrate provided in one embodiment of the present disclosure.

[0041] FIG9 is a schematic diagram of stacking light-emitting elements and conductive isolation columns in another display substrate provided by an embodiment of the present disclosure.

[0042] FIG10 is a schematic diagram of cathode lines of another display substrate provided by an embodiment of the present disclosure.

[0043] FIG11 is a schematic diagram of stacking light-emitting elements and conductive isolation columns in another display substrate provided by an embodiment of the present disclosure.

[0044] FIG12 is a schematic diagram of cathode lines of another display substrate provided by an embodiment of the present disclosure.

[0045] FIG13 is a schematic diagram of stacking light-emitting elements and conductive isolation columns in another display substrate provided by an embodiment of the present disclosure.

[0046] FIG. 14 is a schematic diagram of cathode lines of another display substrate provided by an embodiment of the present disclosure.

[0047] FIG15 is a schematic diagram of stacking light-emitting elements and conductive isolation columns in another display substrate provided by an embodiment of the present disclosure.

[0048] FIG16 is a schematic diagram of cathode lines of another display substrate provided by an embodiment of the present disclosure.

[0049] FIG17 is a schematic diagram of a display device provided in accordance with an embodiment of the present disclosure. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0051] Unless otherwise defined, technical or scientific terms used in this disclosure should have the ordinary meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are simply used to distinguish different components. The words "include" or "comprising" and similar terms mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0052] The features such as “parallel”, “perpendicular” and “same” used in the embodiments of the present disclosure include the features such as “parallel”, “perpendicular” and “same” in a strict sense, as well as the cases where “approximately parallel”, “approximately perpendicular” and “approximately the same” contain certain errors, taking into account the errors associated with the measurement and the measurement of specific quantities (for example, the limitations of the measurement system), and are expressed as being within the acceptable deviation range for a specific value determined by ordinary technicians in this field. For example, “approximately” can mean within one or more standard deviations, or within 10% or 5% of the value. When the number of a component is not specifically indicated below in the embodiments of the present disclosure, it means that the component can be one or more, or can be understood as at least one. “At least one” means one or more, and “multiple” means at least two. The “same layer” in the embodiments of the present disclosure refers to the relationship between multiple film layers formed by the same material after the same step (for example, a one-step patterning process). The “same layer” here does not always mean that the thickness of multiple film layers is the same or the height of multiple film layers in the cross-sectional view is the same.

[0053] With the pursuit of high display quality and technological advancements, the resolution of organic light-emitting diode (OLED) displays continues to increase. However, due to certain process limitations, the mainstream technology for patterning the sub-pixel light-emitting areas of OLED displays, Fine Metal Mask (FMM), cannot form small patterns. This significantly restricts the production of high-resolution OLED displays.

[0054] On the other hand, due to differences in structure and efficiency between organic light-emitting diodes of different colors, in actual applications, the operating currents of organic light-emitting diodes of different colors (for example, red, green, and blue) vary. In typical organic light-emitting diode displays, organic light-emitting diodes of different colors share a common cathode. Therefore, when setting the cathode voltage, it is necessary to meet the voltage required by the organic light-emitting diode with the maximum operating current. In other words, the cathode voltage is set to the voltage required by the organic light-emitting diode with the maximum operating current. In this case, the other organic light-emitting diodes with lower operating currents have redundant voltage and redundant power consumption.

[0055] To this end, an embodiment of the present disclosure provides a display substrate, which includes a base substrate, multiple cathode lines, a planar layer, a pixel defining layer, and multiple light-emitting elements; the multiple cathode lines are located on the base substrate; the planar layer is located on a side of the multiple cathode lines away from the base substrate; the pixel defining layer is located on a side of the planar layer away from the multiple cathode lines; the display substrate also includes multiple conductive isolation pillars arranged in a one-to-one correspondence with the multiple light-emitting elements, each conductive isolation pillar is electrically connected to a cathode line, each light-emitting element includes an anode, a light-emitting layer, and a cathode, and the cathode of each light-emitting element is electrically connected to the corresponding conductive isolation pillar. As a result, the cathode of each light-emitting element in the display substrate can be connected to the cathode line below the planar layer through the conductive isolation pillar, so that a cathode voltage can be applied to the cathode of each light-emitting element through the cathode line below the planar layer. With this arrangement, the display substrate can realize that different light-emitting elements use independent cathodes and apply different cathode voltages, so that each light-emitting element uses an appropriate cathode voltage, avoiding redundant voltage and redundant power consumption, thereby reducing the overall power consumption of the display substrate.

[0056] The present disclosure also provides a display device including the above-mentioned display substrate, which has the advantages of low power consumption.

[0057] The display substrate and the display device provided by the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0058] Figure 1A is a schematic diagram of the structure of a display substrate provided in one embodiment of the present disclosure. As shown in Figure 1A , the display substrate 100 includes a base substrate 110, a plurality of cathode lines 120, a planarization layer 130, a pixel-defining layer 140, and a plurality of light-emitting elements 150. The plurality of cathode lines 120 are located on the base substrate 110; the planarization layer 130 is located on a side of the plurality of cathode lines 120 away from the base substrate 110; and the pixel-defining layer 140 is located on a side of the planarization layer 130 away from the plurality of cathode lines 120.

[0059] For example, as shown in FIG1A , the cathode line 120 is configured to provide a cathode voltage to the cathode of the light-emitting element to drive the light-emitting element to emit light; a plurality of cathode lines may provide different cathode voltages, that is, the cathode voltages on the plurality of cathode lines may include a plurality of different cathode voltages.

[0060] As shown in Figure 1A, the display substrate 100 also includes a plurality of conductive isolation columns 160 arranged in a one-to-one correspondence with the plurality of light-emitting elements 150, each conductive isolation column 160 is electrically connected to a cathode line 120, each light-emitting element 150 includes an anode 152, a light-emitting layer 154 and a cathode 156, and the cathode 156 of each light-emitting element 150 is electrically connected to the corresponding conductive isolation column 160.

[0061] In the display substrate provided in the embodiment of the present disclosure, the cathode of each light-emitting element in the display substrate can be connected to the cathode line below the flat layer through a conductive isolation column, so that a cathode voltage can be applied to the cathode of each light-emitting element through the cathode line below the flat layer. With such a configuration, the display substrate can realize that different light-emitting elements use independent cathodes and apply different cathode voltages, so that each light-emitting element uses a suitable cathode voltage, avoids redundant voltage and redundant power consumption, and thus reduces the overall power consumption of the display substrate. On the other hand, the conductive isolation column itself can also play a certain isolation role to prevent the cathodes of adjacent light-emitting elements from overlapping. It should be noted that the above-mentioned suitable cathode voltage can be selected according to the structure and efficiency differences of organic light-emitting elements of different colors.

[0062] In some examples, the cathode of each light-emitting element can be formed by a patterning process. Thus, on the one hand, the cathode of the light-emitting element can adopt an independent cathode instead of all light-emitting elements sharing one cathode; on the other hand, the display substrate can avoid the problem of low manufacturing precision caused by the fine metal mask (FMM) process, thereby further improving the resolution. Similarly, the light-emitting layer of the light-emitting element can also be formed by a patterning process. Of course, the embodiments of the present disclosure include but are not limited to this, and the cathode and light-emitting layer of the light-emitting element can also be formed by an evaporation process. It should be noted that the above-mentioned patterning process may include a film forming process, an exposure process, a development process and an etching process.

[0063] In some examples, the light-emitting element may be an organic light-emitting element, i.e., the light-emitting layer of the light-emitting element is an organic light-emitting layer. Furthermore, the light-emitting layer may include not only layers that directly emit light, but also functional layers that assist in emitting light, such as a hole injection layer, a hole transport layer, an electron injection layer, and an electron transport layer.

[0064] In some examples, the cathode in the above-mentioned light-emitting element can be formed of a material with high conductivity and low work function, for example, the cathode can be made of a metal material. For example, the anode in the above-mentioned light-emitting element can be formed of a transparent conductive material with a high work function.

[0065] For example, the cathode in the above-mentioned light-emitting element can be made of a metal material, such as any one or more of magnesium (Mg), silver (Ag), copper (Cu), aluminum (Al), titanium (Ti) and molybdenum (Mo), or an alloy material of the above-mentioned metals, such as aluminum-neodymium alloy (AlNd) or molybdenum-niobium alloy (MoNb). It can be a single-layer structure, or a multi-layer composite structure, such as Ti / Al / Ti, etc., or a stack structure formed by metal and transparent conductive material, such as ITO / Ag / ITO, Mo / AlNd / ITO and other reflective materials.

[0066] For example, the anode in the above-mentioned light-emitting element may be made of a transparent conductive material, such as indium tin oxide (ITO), or a multilayer composite structure of metal and transparent conductive material.

[0067] In some examples, as shown in FIG1A , the display substrate 100 further includes a plurality of pixel driving circuits 170 located on a side of the planar layer 130 close to the base substrate 110. The plurality of pixel driving circuits 170 are disposed in a one-to-one correspondence with the plurality of light-emitting elements 150, and the anode 152 of each light-emitting element 150 is electrically connected to the output terminal of the corresponding pixel driving circuit 170. The pixel driving circuit 170 is configured to apply a driving voltage or driving current to the anode 152, thereby cooperating with the cathode voltage on the cathode to drive the light-emitting element to emit light.

[0068] In some examples, the pixel driving circuit may include multiple thin-film transistors and at least one capacitor; therefore, the pixel driving circuit includes at least one conductive layer, such as a gate layer, a source / drain electrode layer, etc. In this case, because both the pixel driving circuit and the cathode lines are located between the substrate and the planar layer, the cathode lines may include the same conductive layer as the conductive layer in the pixel driving circuit. That is, the cathode lines may be provided on the same layer as some conductive structures in the pixel driving circuit, thereby saving mask processing and reducing costs.

[0069] It is worth noting that the cathode lines mentioned above are different from the power lines that provide power voltage to the pixel driving circuit or the data lines that provide data signals to the pixel driving circuit; the power lines and data lines are connected to the pixel driving circuit, while the cathode lines are not connected to the pixel driving circuit.

[0070] In some examples, as described above, other film layers are further provided between the planar layer and the base substrate. These other film layers may include the film layers in the pixel driving circuit (for example, including thin film transistors, storage capacitors and other structures), data lines, gate lines, power signal lines, reset power signal lines, reset control signal lines, light-emitting control signal lines, etc., or insulating layers such as gate insulating layers, interlayer insulating layers, and passivation layers.

[0071] In some examples, the material of the substrate may be made of one or more materials selected from the group consisting of glass, polyimide, polycarbonate, polyacrylate, polyetherimide, and polyethersulfone, and this embodiment includes but is not limited thereto.

[0072] In some examples, the material of the pixel defining layer may include an organic material, such as polyimide, acryl, or polyethylene terephthalate.

[0073] In some examples, the material of the planar layer may be an organic material, such as resin, acrylic, or one or a combination of polyethylene terephthalate, polyimide, polyamide, polycarbonate, epoxy resin, etc.

[0074] In some examples, as shown in FIG. 1A , each conductive spacer 160 is at least partially located on a side of the pixel defining layer 140 away from the base substrate 110 , and each conductive spacer 160 is electrically connected to a cathode line 120 through a via hole passing through the pixel defining layer 140 and the planar layer 130 .

[0075] In some examples, as shown in FIG1A , each conductive spacer 160 is partially located in the via holes of the pixel defining layer 140 and the planar layer 130 . This simplifies the manufacturing process and makes the formed conductive spacer more stable and less prone to breakage.

[0076] In some examples, each conductive isolation pillar may be a single conductive layer or a stack of multiple conductive layers.

[0077] For example, as shown in FIG1A , each conductive spacer 160 may include a stacked first isolation conductive layer 161, a second isolation conductive layer 162, and a third isolation conductive layer 163. Due to the different etching rates of different materials, the conductive spacer 160 may have a dumbbell shape (or an I-shape) in a direction perpendicular to the base substrate 110, that is, the dimensions of the first isolation conductive layer 161 and the third isolation conductive layer 163 in a direction parallel to the base substrate 110 are larger than the dimensions of the second isolation conductive layer 162 in the same direction.

[0078] For example, as shown in FIG1A , the cathode 156 of each light-emitting element 150 overlaps the side surface of the corresponding conductive spacer 160, thereby electrically connecting to the conductive spacer 160. With this arrangement, due to the larger side surface area of ​​the conductive spacer, a stable and reliable electrical connection can be formed between the cathode and the conductive spacer. Furthermore, the conductive spacer can improve the stability of the electrical connection between the cathode and the conductive spacer by increasing its height rather than increasing the area of ​​its orthographic projection on the substrate, thereby reducing the area occupied by the conductive spacer and increasing the aperture ratio. Furthermore, the conductive spacer itself can also provide a certain degree of isolation, preventing the cathodes of adjacent light-emitting elements from overlapping.

[0079] In some examples, as shown in FIG1A , each conductive spacer 160 may include a stacked first isolating conductive layer 161, a second isolating conductive layer 162, and a third isolating conductive layer 163. In this case, the light-emitting layer 154 of each light-emitting element 150 is spaced apart from the second isolating conductive layer 162 of the corresponding conductive spacer 160, so that the cathode 156 overlaps the side surface of the second isolating conductive layer 162 of the corresponding conductive spacer 160 and contacts the top surface of the first isolating conductive layer 161 in the spaced apart arrangement. Thus, the cathode of the light-emitting element overlaps both the first and second isolating conductive layers, further enhancing the stability of the electrical connection.

[0080] In some examples, as shown in FIG. 1A , the light-emitting layer 154 of each light-emitting element 150 overlaps an edge of the first isolation conductive layer 161 of the corresponding conductive isolation column 160 .

[0081] In some examples, as shown in FIG1A , the cathode 156 of each light-emitting element 150 is directly contacted with the side of the corresponding conductive isolation column 160, thereby being electrically connected to the conductive isolation column 160. Of course, the embodiments of the present disclosure include but are not limited to this, and other conductive structures may also be provided between the cathode of each light-emitting element and the side of the corresponding conductive isolation column. FIG1B is a schematic diagram of the overlap between the cathode of another light-emitting element and the corresponding conductive isolation column provided in an embodiment of the present disclosure. As shown in FIG1B , the cathode 156 of each light-emitting element 150 is connected to the side of the conductive isolation column 160 through a conductive structure 260. Therefore, by providing the above-mentioned conductive structure, on the one hand, a material having good bonding force with both the cathode and the conductive isolation column can be used to make the conductive structure, thereby further enhancing the stability of the connection; on the other hand, a suitable material can also be used to reduce the contact resistance between the cathode and the conductive isolation column.

[0082] In some examples, as shown in FIG. 1A , a dimension of the conductive spacer pillar 160 in a direction perpendicular to the base substrate 110 is greater than a dimension of the light emitting element 150 in a direction perpendicular to the base substrate 110 .

[0083] In some examples, as shown in FIG. 1A , a dimension of the conductive spacer pillar 160 in a direction perpendicular to the base substrate 110 is greater than twice a dimension of the light emitting element 150 in a direction perpendicular to the base substrate 110 .

[0084] In some examples, as shown in FIG1A , due to the isolation effect of the conductive isolation column 160 , the film layer to which the light-emitting layer 154 and the cathode 156 of the light-emitting element 150 belong will be partially located on the conductive isolation column 160 , that is, on the side of the conductive isolation column 160 away from the base substrate 110 .

[0085] FIG2 is a schematic plan view of a display substrate provided in accordance with an embodiment of the present disclosure. As shown in FIG1A and FIG2 , a plurality of light-emitting elements 150 include a first light-emitting element 150A, a second light-emitting element 150B, and a third light-emitting element 150C. The first light-emitting element 150A includes a first anode 152A, a first light-emitting layer 154A, and a first cathode 156A. The second light-emitting element 150B includes a second anode 152B, a second light-emitting layer 154B, and a second cathode 156B. The third light-emitting element 150C includes a third anode 152C, a third light-emitting layer 154C, and a third cathode 156C. The first anode 152A and the first cathode 156A are configured to drive the first light-emitting layer 154A to emit light of a first color. The second anode 152B and the second cathode 156B are configured to drive the second light-emitting layer 154B to emit light of a second color. The third anode 152C and the third cathode 156C are configured to drive the third light-emitting layer 154C to emit light of a third color. Thus, the display substrate can achieve full-color display.

[0086] For example, the first color may be red, the second color may be green, and the third color may be blue. Of course, the embodiments of the present disclosure include but are not limited to the above, and the first color, the second color, and the third color may also be other colors.

[0087] In some examples, as shown in FIG. 1A and FIG. 2 , the first cathode 156A, the second cathode 156B, and the third cathode 156C are independent of each other, or the first cathode 156A, the second cathode 156B, and the third cathode 156C are spaced apart from each other.

[0088] In some examples, as shown in FIG1A and FIG2 , the plurality of cathode lines 120 include first cathode lines 120A, second cathode lines 120B, and third cathode lines 120C, and the plurality of conductive spacers 160 include first conductive spacers 160A, second conductive spacers 160B, and third conductive spacers 160C.

[0089] As shown in Figures 1A and 2, a first conductive spacer 160A is electrically connected to a first cathode line 120A and a first cathode 156A of a first light-emitting element 150A, respectively, so that the cathode voltage on the first cathode line 120A can be applied to the first cathode 156A of the first light-emitting element 150A. A second conductive spacer 160B is electrically connected to a second cathode line 120B and a second cathode 156B of the second light-emitting element 150B, respectively, so that the cathode voltage on the second cathode line 120B can be applied to the second cathode 156B of the second light-emitting element 150B. A third conductive spacer 160C is electrically connected to a third cathode line 120C and a third cathode 156C of the third light-emitting element 150C, respectively, so that the cathode voltage on the third cathode line 120C can be applied to the third cathode 156C of the third light-emitting element 150C. Thus, light-emitting elements of different colors can have different cathode voltages applied to them via different cathode lines, enabling each light-emitting element to use a suitable cathode voltage, avoiding redundant voltages and power consumption, and thus reducing the overall power consumption of the display substrate. It should be noted that the above-mentioned appropriate cathode voltage can be selected according to the structure and efficiency differences of organic light-emitting elements of different colors.

[0090] In some examples, the first cathode line 120A, the second cathode line 120B, and the third cathode line 120C are configured to carry different cathode voltages. For example, the first cathode line 120A, the second cathode line 120B, and the third cathode line 120C can be connected to different conductive terminals in the bonding area of ​​the display substrate, thereby carrying different cathode voltages.

[0091] In some examples, as shown in Figures 1A and 2 , the orthographic projection of the first conductive spacer 160A on the base substrate 110 is located around the orthographic projection of the first light-emitting element 150A on the base substrate 110. As a result, the display substrate can utilize the spacing between the first light-emitting element and other light-emitting elements to provide the first conductive spacer, thereby increasing the aperture ratio of the display substrate. Furthermore, the display substrate can utilize the isolation effect of the first conductive spacer to reduce the risk of cathode overlap between the first light-emitting element and other light-emitting elements.

[0092] In some examples, as shown in Figures 1A and 2 , the orthographic projection of the second conductive spacer 160B on the base substrate 110 is located around the orthographic projection of the second light-emitting element 150B on the base substrate 110. Thus, the display substrate can utilize the spacing between the second light-emitting element and other light-emitting elements to provide the second conductive spacer, thereby increasing the aperture ratio of the display substrate. Furthermore, the display substrate can utilize the partitioning effect of the second conductive spacer to reduce the risk of cathode overlap between the second light-emitting element and other light-emitting elements.

[0093] In some examples, as shown in Figures 1A and 2 , the orthographic projection of the third conductive spacer 160C on the base substrate 110 is located around the orthographic projection of the third light-emitting element 150C on the base substrate 110. Thus, the display substrate can utilize the spacing between the third light-emitting element and other light-emitting elements to provide the third conductive spacer, thereby increasing the aperture ratio of the display substrate. Furthermore, the display substrate can utilize the partitioning effect of the third conductive spacer to reduce the risk of cathode overlap between the third light-emitting element and other light-emitting elements.

[0094] In some examples, as shown in FIG1A and FIG2 , the display substrate 100 further includes a first temporary encapsulation layer 180A and a second temporary encapsulation layer 180B. The first temporary encapsulation layer 180A is located on a side of the first light-emitting element 150A away from the base substrate 110. The second temporary encapsulation layer 180B is located on a side of the second light-emitting element 150B away from the base substrate 110. Thus, after forming the first cathode 156A, the first temporary encapsulation layer 180A promptly encapsulates the first light-emitting element 150A to prevent the first light-emitting element 150A from being corroded by water and oxygen in subsequent processes. The second temporary encapsulation layer 180B promptly encapsulates the first light-emitting element 150B after forming the second cathode 156B to prevent the first light-emitting element 150B from being corroded by water and oxygen in subsequent processes.

[0095] In some examples, as shown in FIG1A and FIG2 , the display substrate 100 further includes a third temporary encapsulation layer 180C located on a side of the third light emitting element 150C away from the base substrate 110 , thereby preventing the third light emitting element 150C from being corroded by water and oxygen in subsequent processes.

[0096] It is worth noting that since the cathodes of the light-emitting elements of different colors in this embodiment are not formed in one process step, the process of this embodiment can be adapted by forming the above-mentioned temporary packaging layer to prevent water and oxygen from corroding the formed light-emitting elements.

[0097] In some examples, as shown in Figures 1A and 2, the first temporary encapsulation layer 180A, the second temporary encapsulation layer 180B, and the third temporary encapsulation layer 180C are independent of each other and spaced apart from each other. In other words, the first temporary encapsulation layer, the second temporary encapsulation layer, and the third temporary encapsulation layer are not encapsulation layers in a conventional display substrate, but are different encapsulation structures that are independently provided and manufactured.

[0098] In some examples, as shown in Figures 1A and 2, the display substrate 100 further includes an encapsulation layer 190 located away from the base substrate 110 between the first temporary encapsulation layer 180A, the second temporary encapsulation layer 180B, and the third temporary encapsulation layer 180C. The encapsulation layer 190 is equivalent to the encapsulation layer in a conventional display substrate. In addition, because the display substrate employs two encapsulation structures (the temporary encapsulation layer and the encapsulation layer), the encapsulation effect of the display substrate is improved, and the display substrate has a better water-proof oxygen corrosion effect.

[0099] In some examples, as shown in Figures 1A and 2, the orthographic projection of each conductive spacer 160 on the base substrate 110 surrounds the orthographic projection of the corresponding light-emitting element 150 on the base substrate 110. This arrangement, on the one hand, allows the cathode 156 of each light-emitting element 150 to be electrically connected to the surrounding conductive spacer 160, thereby providing a more stable electrical connection; on the other hand, each conductive spacer 160 can also provide a better isolation effect.

[0100] For example, as shown in Figures 1A and 2 , the orthographic projection of the first conductive spacer 160A on the base substrate 110 surrounds the orthographic projection of the corresponding first light-emitting element 150A on the base substrate 110. This arrangement, on the one hand, allows the cathode 156A of the first light-emitting element 150A to be electrically connected to the surrounding first conductive spacer 160A, thereby achieving a more stable electrical connection; on the other hand, the first conductive spacer 160A can also provide a better isolation effect.

[0101] For example, as shown in Figures 1A and 2 , the orthographic projection of the second conductive spacer 160B on the base substrate 110 surrounds the orthographic projection of the corresponding second light-emitting element 150B on the base substrate 110. This arrangement, on the one hand, allows the cathode 156B of the second light-emitting element 150B to be electrically connected to the surrounding second conductive spacer 160B, thereby achieving a more stable electrical connection; on the other hand, the second conductive spacer 160B can also provide a better isolation effect.

[0102] For example, as shown in Figures 1A and 2 , the orthographic projection of the third conductive spacer 160C on the base substrate 110 surrounds the orthographic projection of the corresponding third light-emitting element 150C on the base substrate 110. This arrangement, on the one hand, allows the cathode 156C of the third light-emitting element 150C to be electrically connected to the surrounding third conductive spacer 160C, thereby achieving a more stable electrical connection; on the other hand, the third conductive spacer 160C can also provide a better isolation effect.

[0103] FIG3 is a schematic diagram illustrating the stacking of light-emitting elements and conductive spacers in a display substrate according to an embodiment of the present disclosure. As shown in FIG3 , the orthographic projection of a first conductive spacer 160A on a base substrate 110 surrounds the orthographic projection of a corresponding first light-emitting element 150A on the base substrate 110. The first cathode 156A of the first light-emitting element 150A overlaps the side surface of the first conductive spacer 160A surrounding the first light-emitting element 150A (e.g., the side surface proximal to the first light-emitting element), and the contact surface formed by the overlap can be annular.

[0104] In some examples, as shown in FIG3 , the orthographic projection of the second conductive isolation column 160B on the base substrate 110 surrounds the orthographic projection of the corresponding second light-emitting element 150B on the base substrate 110, and the second cathode 156B of the second light-emitting element 150B overlaps the side surface of the second conductive isolation column 160B surrounding the second light-emitting element 150B (for example, the side surface close to the second light-emitting element), and the contact surface formed by the overlap may be annular.

[0105] In some examples, as shown in FIG3 , the orthographic projection of the third conductive isolation column 160C on the base substrate 110 surrounds the orthographic projection of the corresponding third light-emitting element 150C on the base substrate 110, and the third cathode 156C of the third light-emitting element 150C overlaps with the side surface of the third conductive isolation column 160C surrounding the third light-emitting element 150C (for example, the side surface close to the third light-emitting element), and the contact surface formed by the overlap may be annular.

[0106] In some examples, as shown in FIG3 , the first light-emitting element 150A further includes a first opening 158A located within the pixel-defining layer 140. The first anode 152A is located on a side of the pixel-defining layer 140 that is closer to the base substrate 110 and is exposed by the first opening 158A. The first light-emitting layer 154A is at least partially located within the first opening 158A to contact the first anode 152A. Thus, the effective display area of ​​the first light-emitting element is primarily defined by the first opening.

[0107] In some examples, as shown in FIG3 , the second light-emitting element 150B further includes a second opening 158B located within the pixel-defining layer 140. The second anode 152B is located on a side of the pixel-defining layer 140 close to the base substrate 110 and is exposed by the second opening 158B. The second light-emitting layer 154B is at least partially located within the second opening 158B to contact the second anode 152B. Thus, the effective display area of ​​the second light-emitting element is primarily defined by the second opening.

[0108] In some examples, as shown in FIG3 , the third light-emitting element 150B further includes a third opening 158C located within the pixel-defining layer 140. The third anode 152C is located on a side of the pixel-defining layer 140 close to the base substrate 110 and is exposed by the third opening 158C. The third light-emitting layer 154C is at least partially located within the third opening 158C to contact the third anode 152C. Thus, the effective display area of ​​the third light-emitting element is primarily defined by the third opening.

[0109] In some examples, as shown in FIG. 3 , the first anode 152A, the second anode 152B, and the third anode 152C may all be located in the anode layer between the planarization layer 130 and the pixel defining layer 140 .

[0110] In some examples, as shown in FIG3 , the orthographic projection of the first conductive isolation column 160A on the substrate substrate 110 surrounds the orthographic projection of the first opening 158A of the first light-emitting element 150A on the substrate substrate 110; the orthographic projection of the second conductive isolation column 160B on the substrate substrate 110 surrounds the orthographic projection of the second opening 158B of the second light-emitting element 150B on the substrate substrate 110; and the orthographic projection of the third conductive isolation column 160C on the substrate substrate 110 surrounds the orthographic projection of the third opening 158C of the third light-emitting element 150C on the substrate substrate 110.

[0111] In some examples, as shown in FIG3 , the arrangement structure of the plurality of light-emitting elements 150 can adopt a GGRB arrangement structure. That is, the plurality of light-emitting elements 150 can be arranged to include a plurality of light-emitting element groups 220, each light-emitting element group 220 including a first light-emitting element 150A, two second light-emitting elements 150B, and one third light-emitting element 150C. In each light-emitting element group 220, the first light-emitting element 150A and the third light-emitting element 150C are arranged along a first direction, and the two second light-emitting elements 150B are arranged along a second direction.

[0112] In some examples, as shown in FIG3 , in each light-emitting element group 220 , the first conductive isolation column 160A corresponding to the first light-emitting element 150A is connected to the first cathode line 160A through a via; the second conductive isolation columns 160B corresponding to the two second light-emitting elements 150B are connected to the same second cathode line 160B through a via; and the third conductive isolation column 160C corresponding to the third light-emitting element 150C is connected to the third cathode line 160C through a via.

[0113] Figure 4 is a schematic diagram of multiple cathode lines in a display substrate according to one embodiment of the present disclosure. As shown in Figure 4, the display substrate 100 further includes multiple cathode connecting lines 210, each of which is electrically connected to at least two of the multiple cathode lines 120, thereby effectively reducing the resistance and voltage drop of the cathode lines.

[0114] In some examples, as shown in FIG4 , each cathode connection line 210 is located in the first conductive layer 201 and extends along a first direction, and each cathode line 120 is located in the second conductive layer 202 and extends along a second direction. Thus, each cathode connection line facilitates electrical connection of cathode lines that need to be connected.

[0115] For example, the first direction and the second direction may be perpendicular to each other. Of course, the embodiments of the present disclosure include but are not limited to this.

[0116] In some examples, the first conductive layer may be a conductive layer included in the pixel driving circuit, such as a gate layer, a source-drain electrode layer, etc.; the second conductive layer may be another conductive layer included in the pixel driving circuit, such as a gate layer, a source-drain electrode layer, etc. In this case, since the pixel driving circuit, the cathode connecting line, and the cathode line are all located between the base substrate and the planar layer, the cathode connecting line and the cathode line may include the same conductive layer as the conductive layer in the pixel driving circuit, thereby saving mask processes and reducing costs.

[0117] In some examples, as shown in FIG4 , the plurality of cathode lines 120 include a plurality of first cathode lines 120A, a plurality of second cathode lines 120B, and a plurality of third cathode lines 120C, and the plurality of cathode connecting lines 210 include a first cathode connecting line 210A, a second cathode connecting line 210B, and a third cathode connecting line 210C; two first cathode lines 120A adjacent in the first direction are electrically connected to the same first cathode connecting line 210A, two second cathode lines 120B adjacent in the first direction are electrically connected to the same second cathode connecting line 210B, and two third cathode lines 120C adjacent in the first direction are electrically connected to the same third cathode connecting line 120C. Thus, the first cathode connecting line 210A can effectively reduce the resistance and voltage drop of the first cathode line 120A and maintain the uniformity of the entire display substrate; the second cathode connecting line 210B can effectively reduce the resistance and voltage drop of the second cathode line 120B and maintain the uniformity of the entire display substrate; the third cathode connecting line 210C can effectively reduce the resistance and voltage drop of the third cathode line 120C and maintain the uniformity of the entire display substrate.

[0118] In some examples, as shown in FIG. 4 , the first cathode connection line 210A, the second cathode connection line 210B, and the third cathode connection line 210C are arranged along the second direction.

[0119] Figure 5 is a planar schematic diagram of another display substrate provided in an embodiment of the present disclosure; Figure 6 is a schematic diagram of the stacking of light-emitting elements and conductive isolation columns in another display substrate provided in an embodiment of the present disclosure; Figure 7 is a schematic diagram of cathode lines in another display substrate provided in an embodiment of the present disclosure.

[0120] Unlike the display substrate shown in FIG2 , as shown in FIG5 , FIG6 , and FIG7 , the arrangement structure of the plurality of light-emitting elements 150 can adopt a real-RGB arrangement structure. That is, the plurality of light-emitting elements 150 can be arranged to include a plurality of light-emitting element groups 220 , each light-emitting element group 220 including a first light-emitting element 150A, a second light-emitting element 150B, and a third light-emitting element 150C. Within each light-emitting element group 220 , the first light-emitting element 150A and the second light-emitting element 150B are arranged along the second direction, while the first light-emitting element 150A and the third light-emitting element 150C are arranged along the first direction.

[0121] In some examples, as shown in Figures 5, 6 and 7, in each light-emitting element group 220, the first conductive isolation column 160A corresponding to the first light-emitting element 150A is connected to the first cathode line 160A through a via; the second conductive isolation column 160B corresponding to the second light-emitting element 150B is connected to the second cathode line 160B through a via; and the third conductive isolation column 160C corresponding to the third light-emitting element 150C is connected to the third cathode line 160C through a via.

[0122] In some examples, as shown in Figures 5, 6 and 7, since the first light-emitting element 150A and the second light-emitting element 150B arranged in the second direction need to connect two different cathode lines 120, the size of the first light-emitting element 150A and the second light-emitting element 150B in the first direction is larger than the size of the third light-emitting element 150C in the first direction.

[0123] Figure 8 is a schematic diagram of the structure of a display substrate provided in one embodiment of the present disclosure. As shown in Figure 8, the display substrate 100 includes a base substrate 110, a plurality of cathode lines 120, a planarization layer 130, a pixel defining layer 140, and a plurality of light-emitting elements 150. The plurality of cathode lines 120 are located on the base substrate 110; the planarization layer 130 is located on a side of the plurality of cathode lines 120 away from the base substrate 110; and the pixel defining layer 140 is located on a side of the planarization layer 130 away from the plurality of cathode lines 120.

[0124] For example, as shown in FIG8 , the cathode line 120 is configured to provide a cathode voltage to the cathode of the light-emitting element to drive the light-emitting element to emit light; a plurality of cathode lines may provide different cathode voltages, that is, the cathode voltages on the plurality of cathode lines may include a plurality of different cathode voltages.

[0125] As shown in FIG8 , the display substrate 100 further includes a plurality of conductive spacer pillars 160 disposed in a one-to-one correspondence with the plurality of light-emitting elements 150. Each conductive spacer pillar 160 is electrically connected to a cathode line 120. Each light-emitting element 150 includes an anode 152, a light-emitting layer 154, and a cathode 156. The cathode 156 of each light-emitting element 150 is electrically connected to a corresponding conductive spacer pillar 160. Unlike the display substrate shown in FIG1A , only one conductive spacer pillar 160 is disposed between adjacent light-emitting elements 150.

[0126] In the display substrate provided in the embodiment of the present disclosure, the cathode of each light-emitting element in the display substrate can be connected to the cathode line below the flat layer through a conductive isolation column, so that a cathode voltage can be applied to the cathode of each light-emitting element through the cathode line below the flat layer. In this way, the display substrate can realize that different light-emitting elements use independent cathodes and apply different cathode voltages, so that each light-emitting element uses a suitable cathode voltage, avoiding redundant voltage and redundant power consumption, thereby reducing the overall power consumption of the display substrate. On the other hand, the conductive isolation column itself can also play a certain isolation role, preventing the cathodes of adjacent light-emitting elements from overlapping. In addition, since only one conductive isolation column is set between adjacent light-emitting elements, the display substrate can further reduce the spacing width between adjacent light-emitting elements, thereby improving the aperture ratio and resolution. It should be noted that the above-mentioned suitable cathode voltage can be selected according to the structure and efficiency differences of organic light-emitting elements of different colors.

[0127] In some examples, as shown in FIG. 8 , the cathode 156 of each light emitting element 150 is connected only to the conductive spacer 160 on one side of the light emitting element 150 , rather than to all the conductive spacer 160 on both sides or around the light emitting element 150 .

[0128] FIG9 is a schematic diagram of the stacking of light-emitting elements and conductive isolation columns in another display substrate provided in an embodiment of the present disclosure; FIG10 is a schematic diagram of cathode lines of another display substrate provided in an embodiment of the present disclosure. As shown in Figures 8, 9, and 10, the plurality of light-emitting elements 150 include a first light-emitting element 150A, a second light-emitting element 150B, and a third light-emitting element 150C. The first light-emitting element 150A includes a first anode 152A, a first light-emitting layer 154A, and a first cathode 156A. The second light-emitting element 150B includes a second anode 152B, a second light-emitting layer 154B, and a second cathode 156B. The third light-emitting element 150C includes a third anode 152C, a third light-emitting layer 154C, and a third cathode 156C. The first anode 152A and the first cathode 156A are configured to drive the first light-emitting layer 154A to emit light of a first color, the second anode 152B and the second cathode 156B are configured to drive the second light-emitting layer 154B to emit light of a second color, and the third anode 152C and the third cathode 156C are configured to drive the third light-emitting layer 154C to emit light of a third color. Thus, the display substrate can achieve full-color display.

[0129] For example, the first color may be red, the second color may be green, and the third color may be blue. Of course, the embodiments of the present disclosure include but are not limited to the above, and the first color, the second color, and the third color may also be other colors.

[0130] In some examples, as shown in FIG8 , FIG9 , and FIG10 , the first cathode 156A, the second cathode 156B, and the third cathode 156C are independent of each other, or the first cathode 156A, the second cathode 156B, and the third cathode 156C are spaced apart from each other.

[0131] In some examples, as shown in Figures 8, 9 and 10, the plurality of cathode lines 120 include first cathode lines 120A, second cathode lines 120B and third cathode lines 120C, and the plurality of conductive isolation pillars 160 include first conductive isolation pillars 160A, second conductive isolation pillars 160B and third conductive isolation pillars 160C.

[0132] As shown in Figures 8, 9, and 10, first conductive spacer 160A is electrically connected to first cathode line 120A and first cathode 156A of first light-emitting element 150A, respectively, so that the cathode voltage on first cathode line 120A can be applied to first cathode 156A of first light-emitting element 150A. Second conductive spacer 160B is electrically connected to second cathode line 120B and second cathode 156B of second light-emitting element 150B, respectively, so that the cathode voltage on second cathode line 120B can be applied to second cathode 156B of second light-emitting element 150B. Third conductive spacer 160C is electrically connected to third cathode line 120C and third cathode 156C of third light-emitting element 150C, respectively, so that the cathode voltage on third cathode line 120C can be applied to third cathode 156C of third light-emitting element 150C. Thus, light-emitting elements of different colors can be supplied with different cathode voltages via different cathode lines, enabling each light-emitting element to use an appropriate cathode voltage, avoiding redundant voltages and redundant power consumption, and thus reducing the overall power consumption of the display substrate. It should be noted that the above-mentioned appropriate cathode voltage can be selected according to the structure and efficiency differences of organic light-emitting elements of different colors.

[0133] In some examples, the first cathode line 120A, the second cathode line 120B, and the third cathode line 120C are configured to carry different cathode voltages. For example, the first cathode line 120A, the second cathode line 120B, and the third cathode line 120C can be connected to different conductive terminals in the bonding area of ​​the display substrate, thereby carrying different cathode voltages.

[0134] In some examples, as shown in Figures 8, 9, and 10, the orthographic projection of the first conductive spacer 160A on the base substrate 110 is located around the orthographic projection of the first light-emitting element 150A on the base substrate 110. As a result, the display substrate can utilize the spacing between the first light-emitting element and other light-emitting elements to provide the first conductive spacer, thereby increasing the aperture ratio of the display substrate. Furthermore, the display substrate can utilize the isolation effect of the first conductive spacer to reduce the risk of cathode overlap between the first light-emitting element and other light-emitting elements.

[0135] In some examples, as shown in Figures 8, 9, and 10, the orthographic projection of the second conductive spacer 160B on the base substrate 110 is located around the orthographic projection of the second light-emitting element 150B on the base substrate 110. Thus, the display substrate can utilize the spacing between the second light-emitting element and other light-emitting elements to provide the second conductive spacer, thereby increasing the aperture ratio of the display substrate. Furthermore, the display substrate can utilize the partitioning effect of the second conductive spacer to reduce the risk of cathode overlap between the second light-emitting element and other light-emitting elements.

[0136] In some examples, as shown in Figures 8, 9, and 10, the orthographic projection of the third conductive spacer 160C on the base substrate 110 is located around the orthographic projection of the third light-emitting element 150C on the base substrate 110. Thus, the display substrate can utilize the spacing between the third light-emitting element and other light-emitting elements to provide the third conductive spacer, thereby increasing the aperture ratio of the display substrate. Furthermore, the display substrate can utilize the partitioning effect of the third conductive spacer to reduce the risk of cathode overlap between the third light-emitting element and other light-emitting elements.

[0137] In some examples, as shown in Figures 8, 9, and 10, the orthographic projection of each conductive spacer 160 on the base substrate 110 semi-encloses the orthographic projection of the corresponding light-emitting element 150 on the base substrate 110. This arrangement, on the one hand, allows the cathode 156 of each light-emitting element 150 to be electrically connected to the surrounding conductive spacer 160, thereby ensuring a relatively stable electrical connection, and each conductive spacer 160 also provides a good barrier effect. Furthermore, this display substrate allows only one conductive spacer to be provided between adjacent light-emitting elements 150, further improving the aperture ratio and resolution.

[0138] For example, as shown in Figures 8, 9, and 10, the orthographic projection of the first conductive spacer 160A on the base substrate 110 semi-encloses the orthographic projection of the corresponding first light-emitting element 150A on the base substrate 110. In this configuration, other conductive spacers can be installed at the location where the gap of the first conductive spacer 160A is located.

[0139] For example, as shown in Figures 8, 9, and 10, the orthographic projection of the second conductive spacer 160B on the base substrate 110 semi-encloses the orthographic projection of the corresponding second light-emitting element 150B on the base substrate 110. In this configuration, other conductive spacers can be installed at the location where the gap of the second conductive spacer 160B is located.

[0140] For example, as shown in Figures 8, 9, and 10, the orthographic projection of the third conductive spacer 160C on the base substrate 110 semi-encloses the orthographic projection of the corresponding third light-emitting element 150C on the base substrate 110. In this configuration, other conductive spacers can be installed at the location where the gap of the third conductive spacer 160C is located.

[0141] In some examples, as shown in FIG9 , the arrangement structure of the plurality of light-emitting elements 150 can adopt a GGRB arrangement structure. That is, the plurality of light-emitting elements 150 can be arranged to include a plurality of light-emitting element groups 220, each light-emitting element group 220 including a first light-emitting element 150A, two second light-emitting elements 150B, and one third light-emitting element 150C. In each light-emitting element group 220, the first light-emitting element 150A and the third light-emitting element 150C are arranged along a first direction, and the two second light-emitting elements 150B are arranged along a second direction.

[0142] FIG11 is a schematic diagram of the stacking of light-emitting elements and conductive isolation columns in another display substrate provided in an embodiment of the present disclosure; FIG12 is a schematic diagram of the cathode lines of another display substrate provided in an embodiment of the present disclosure. Unlike the display substrates shown in FIG9 and FIG10, as shown in FIG11 and FIG12, the arrangement structure of the plurality of light-emitting elements 150 can adopt a real-RGB arrangement structure. In other words, the plurality of light-emitting elements 150 can be arranged to include a plurality of light-emitting element groups 220, each light-emitting element group 220 including a first light-emitting element 150A, a second light-emitting element 150B, and a third light-emitting element 150C. In each light-emitting element group 220, the first light-emitting element 150A and the second light-emitting element 150B are arranged along the second direction, and the first light-emitting element 150A and the third light-emitting element 150C are arranged along the first direction.

[0143] In some examples, as shown in Figures 11 and 12, in each light-emitting element group 220, the first conductive isolation column 160A corresponding to the first light-emitting element 150A is connected to the first cathode line 160A through a via; the second conductive isolation column 160B corresponding to the second light-emitting element 150B is connected to the second cathode line 160B through a via; and the third conductive isolation column 160C corresponding to the third light-emitting element 150C is connected to the third cathode line 160C through a via.

[0144] In some examples, as shown in Figures 11 and 12, since the first light-emitting element 150A and the second light-emitting element 150B arranged in the second direction need to connect two different cathode lines 120, the size of the first light-emitting element 150A and the second light-emitting element 150B in the first direction is larger than the size of the third light-emitting element 150C in the first direction.

[0145] FIG13 is a schematic diagram of the stacking of light-emitting elements and conductive isolation columns in another display substrate provided in an embodiment of the present disclosure; FIG14 is a schematic diagram of the cathode lines of another display substrate provided in an embodiment of the present disclosure. Unlike the display substrates shown in FIG9 and FIG10, as shown in FIG13 and FIG14, the orthographic projection of each conductive isolation column 160 on the base substrate 110 is located on one side of the orthographic projection of an edge of the corresponding light-emitting element 150 on the base substrate 110. With such an arrangement, on the one hand, the cathode 156 of each light-emitting element 150 can be electrically connected to the surrounding conductive isolation columns 160, thereby having a relatively stable electrical connection. On the other hand, the display substrate can achieve the arrangement of only one conductive isolation column between adjacent light-emitting elements 150, thereby further improving the aperture ratio and resolution.

[0146] For example, as shown in Figures 13 and 14 , the orthographic projection of the first conductive spacer 160A on the base substrate 110 is located on one side of the orthographic projection of one edge of the corresponding first light-emitting element 150A on the base substrate 110. In this configuration, other conductive spacer pillars can be provided at the locations of other edges of the first light-emitting element 150A.

[0147] For example, as shown in Figures 13 and 14 , the orthographic projection of the second conductive spacer 160B on the base substrate 110 is located on one side of the orthographic projection of one edge of the corresponding second light-emitting element 150B on the base substrate 110. In this configuration, other conductive spacer pillars can be provided at the locations of other edges of the second light-emitting element 150B.

[0148] For example, as shown in Figures 13 and 14 , the orthographic projection of the third conductive spacer 160C on the base substrate 110 is located on one side of the orthographic projection of one edge of the corresponding third light-emitting element 150C on the base substrate 110. In this configuration, other conductive spacer pillars can be provided at the locations of other edges of the third light-emitting element 150C.

[0149] FIG15 is a schematic diagram of the stacking of light-emitting elements and conductive isolation columns in another display substrate provided in an embodiment of the present disclosure; FIG16 is a schematic diagram of the cathode lines of another display substrate provided in an embodiment of the present disclosure. Unlike the display substrates shown in FIG13 and FIG14 , as shown in FIG15 and FIG16 , the arrangement structure of the plurality of light-emitting elements 150 can adopt a real-RGB arrangement structure. In other words, the plurality of light-emitting elements 150 can be arranged to include a plurality of light-emitting element groups 220, each light-emitting element group 220 including a first light-emitting element 150A, a second light-emitting element 150B, and a third light-emitting element 150C. In each light-emitting element group 220, the first light-emitting element 150A and the second light-emitting element 150B are arranged along the second direction, and the first light-emitting element 150A and the third light-emitting element 150C are arranged along the first direction.

[0150] FIG17 is a schematic diagram of a display device provided in accordance with an embodiment of the present disclosure. As shown in FIG17 , the display device 500 includes the display substrate 100 described above. As a result, the display device can have advantages such as high resolution and low power consumption.

[0151] For example, the display device can be a display device such as an organic light emitting diode display device, as well as any product or component with a display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, navigator, etc. that includes the display device, but this embodiment is not limited to this.

[0152] There are a few points to note:

[0153] (1) The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures can refer to general designs.

[0154] (2) In the absence of conflict, features in the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0155] The foregoing description is merely an exemplary embodiment of the present disclosure and is not intended to limit the scope of protection of the present disclosure. The scope of protection of the present disclosure is determined by the appended claims.

Claims

1. A display substrate, comprising: a substrate substrate; a plurality of cathode lines located on the substrate substrate; a planarization layer located on a side of the plurality of cathode lines away from the substrate substrate; a pixel definition layer located on a side of the planarization layer away from the plurality of cathode lines; and a plurality of light-emitting elements, wherein the display substrate further includes a plurality of conductive isolation posts, which are provided in one-to-one correspondence with the plurality of light-emitting elements, and each of the conductive isolation posts is electrically connected to one of the cathode lines, each of the light-emitting elements includes an anode, a light-emitting layer, and a cathode, and the cathode of each of the light-emitting elements is electrically connected to the corresponding conductive isolation post.

2. The display substrate according to claim 1, further comprising: a plurality of pixel driving circuits located on a side of the planarization layer close to the substrate substrate, wherein the plurality of pixel driving circuits are provided in one-to-one correspondence with the plurality of light-emitting elements, and the anode of each of the light-emitting elements is electrically connected to the output terminal of the corresponding pixel driving circuit.

3. The display substrate according to claim 1, wherein, each of the conductive isolation posts is at least partially located on a side of the pixel definition layer away from the substrate substrate, and each of the conductive isolation posts is electrically connected to one of the cathode lines through a via hole passing through the pixel definition layer and the planarization layer.

4. The display substrate according to claim 3, wherein, each of the conductive isolation posts is partially located in the via holes of the pixel definition layer and the planarization layer.

5. The display substrate according to claim 1, wherein, the cathode of each of the light-emitting elements is lapped with the side surface of the corresponding conductive isolation post.

6. The display substrate according to claim 5, wherein, the cathode of each of the light-emitting elements is in contact with the side surface of the corresponding conductive isolation post.

7. The display substrate according to claim 5, wherein, the cathode of each of the light-emitting elements is connected to the side surface of the conductive isolation post through a conductive structure.

8. The display substrate according to any one of claims 1-7, wherein, the plurality of light-emitting elements include a first light-emitting element, a second light-emitting element, and a third light-emitting element, the first light-emitting element includes a first anode, a first light-emitting layer, and a first cathode, the second light-emitting element includes a second anode, a second light-emitting layer, and a second cathode, the third light-emitting element includes a third anode, a third light-emitting layer, and a third cathode, the first anode and the first cathode are configured to drive the first light-emitting layer to emit light of a first color, the second anode and the second cathode are configured to drive the second light-emitting layer to emit light of a second color, and the third anode and the third cathode are configured to drive the third light-emitting layer to emit light of a third color.

9. The display substrate according to claim 8, wherein, the plurality of cathode lines include a first cathode line, a second cathode line, and a third cathode line, and the plurality of conductive isolation posts include a first conductive isolation post, a second conductive isolation post, and a third conductive isolation post, The first conductive isolation column is electrically connected to the first cathode line and the first cathode of the first light-emitting element respectively, the second conductive isolation column is electrically connected to the second cathode line and the second cathode of the second light-emitting element respectively, and the third conductive isolation column is electrically connected to the third cathode line and the third cathode of the third light-emitting element respectively.

10. The display substrate according to claim 9, wherein, the first cathode line, the second cathode line and the third cathode line are configured to be loaded with different cathode voltages.

11. The display substrate according to claim 9, wherein, the orthographic projection of the first conductive isolation column on the substrate is located around the orthographic projection of the first light-emitting element on the substrate, the orthographic projection of the second conductive isolation column on the substrate is located around the orthographic projection of the second light-emitting element on the substrate, and the orthographic projection of the third conductive isolation column on the substrate is located around the orthographic projection of the third light-emitting element on the substrate.

12. The display substrate according to any one of claims 9-11, wherein, the first color is red, the second color is green, and the third color is blue.

13. The display substrate according to any one of claims 9-11, wherein, the first light-emitting element further includes a first opening located in the pixel defining layer. The first anode is located on the side of the pixel defining layer close to the substrate and is exposed by the first opening. At least a part of the first light-emitting layer is located in the first opening to contact the first anode; the second light-emitting element further includes a second opening located in the pixel defining layer. The second anode is located on the side of the pixel defining layer close to the substrate and is exposed by the second opening. At least a part of the second light-emitting layer is located in the second opening to contact the second anode; the third light-emitting element further includes a third opening located in the pixel defining layer. The third anode is located on the side of the pixel defining layer close to the substrate and is exposed by the third opening. At least a part of the third light-emitting layer is located in the third opening to contact the third anode.

14. The display substrate according to claim 13, wherein, the orthographic projection of the first conductive isolation column on the substrate surrounds the orthographic projection of the first opening of the first light-emitting element on the substrate, the orthographic projection of the second conductive isolation column on the substrate surrounds the orthographic projection of the second opening of the second light-emitting element on the substrate, and the orthographic projection of the third conductive isolation column on the substrate surrounds the orthographic projection of the third opening of the third light-emitting element on the substrate.

15. The display substrate according to claim 13, wherein, The positive projection of the first conductive isolation pillar on the substrate semi - surrounds the positive projection of the first opening of the first light - emitting element on the substrate. The positive projection of the second conductive isolation pillar on the substrate semi - surrounds the positive projection of the second opening of the second light - emitting element on the substrate. The positive projection of the third conductive isolation pillar on the substrate semi - surrounds the positive projection of the third opening of the third light - emitting element on the substrate. Between adjacent first and second light - emitting elements, between adjacent second and third light - emitting elements, and between adjacent first and third light - emitting elements, only one conductive isolation pillar is provided.

16. The display substrate according to claim 13, wherein, The positive projection of the first conductive isolation pillar on the substrate is located on one side of the positive projection of an edge of the first opening of the first light - emitting element on the substrate. The positive projection of the second conductive isolation pillar on the substrate is located on one side of the positive projection of an edge of the second opening of the second light - emitting element on the substrate. The positive projection of the third conductive isolation pillar on the substrate is located on one side of the positive projection of an edge of the third opening of the third light - emitting element on the substrate.

17. The display substrate according to any one of claims 8 - 16, further comprises: A first temporary encapsulation layer, located on the side of the first light - emitting element away from the substrate; A second temporary encapsulation layer, located on the side of the second light - emitting element away from the substrate; and A third temporary encapsulation layer, located on the side of the third light - emitting element away from the substrate, wherein, the first temporary encapsulation layer, the second temporary encapsulation layer, and the third temporary encapsulation layer are independent of each other and are spaced apart from each other.

18. The display substrate according to claim 17, further comprises: An encapsulation layer, located on the side of the first temporary encapsulation layer, the second temporary encapsulation layer, and the third temporary encapsulation layer away from the substrate.

19. The display substrate according to any one of claims 1 - 7, wherein, The positive projection of each conductive isolation pillar on the substrate surrounds the positive projection of the corresponding light - emitting element on the substrate.

20. The display substrate according to any one of claims 1 - 7, wherein, The positive projection of each conductive isolation pillar on the substrate semi - surrounds the positive projection of the corresponding light - emitting element on the substrate.

21. The display substrate according to any one of claims 1 - 7, wherein, The positive projection of each conductive isolation pillar on the substrate is located on one side of the positive projection of an edge of the corresponding light - emitting element on the substrate.

22. The display substrate according to any one of claims 1 - 7, wherein, Only one conductive isolation pillar is provided between two adjacent light - emitting elements.

23. The display substrate according to any one of claims 1 - 7, further comprises: Multiple cathode connection lines, each of the cathode connection lines being electrically connected to at least two of the multiple cathode lines. Wherein, each of the cathode connection lines is located in the first conductive layer and extends along a first direction, each of the cathode lines is located in the second conductive layer and extends along a second direction, and the first direction and the second direction intersect.

24. The display substrate according to claim 23, wherein, the multiple cathode lines include multiple first cathode lines, multiple second cathode lines, and multiple third cathode lines, and the multiple cathode connection lines include a first cathode connection line, a second cathode connection line, and a third cathode connection line. Two adjacent first cathode lines in the first direction are electrically connected to the same first cathode connection line, two adjacent second cathode lines in the first direction are electrically connected to the same second cathode connection line, and two adjacent third cathode lines in the first direction are electrically connected to the same third cathode connection line.

25. The display substrate according to claim 24, wherein, the first cathode connection line, the second cathode connection line, and the third cathode connection line are arranged along the second direction.

26. A display device, comprising the display substrate according to any one of claims 1-25.

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