Display substrate and manufacturing method thereof

Abstract

A display substrate and a manufacturing method thereof, the display device comprises: a base substrate; a first conductive layer arranged on the base substrate, wherein the first conductive layer comprises a first signal line, a second signal line and an additional pad layer arranged at intervals; an electroluminescent material layer, arranged on a side of the first conductive layer away from the base substrate, wherein the electroluminescent material layer comprises a first end and a second end opposite to each other, the orthographic projection of the first end on the base substrate falls within the orthographic projection of the first signal line on the base substrate, the orthographic projection of the second end on the base substrate falls within the orthographic projection of the additional pad layer on the base substrate, and the orthographic projection of the first end on the base substrate and the orthographic projection of the second end on the base substrate are respectively located on both sides of the orthographic projection of the second signal line on the base substrate.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display substrate and a manufacturing method thereof. Background Art

[0002] OLED (Organic Light-Emitting Diode) is a device that uses a multi-layer organic thin film structure to generate electroluminescence. It is a type of electroluminescent device. It is easy to make and only requires a low driving voltage. These main features make OLED very prominent in meeting the application of flat-panel displays. OLED displays are thinner and lighter than LCDs, have higher brightness, lower power consumption, faster response, higher clarity, better flexibility, and higher luminous efficiency, and can meet consumers' new demands for display technology. Summary of the invention

[0003] Some embodiments of the present disclosure provide a display substrate, comprising: a base substrate; a first conductive layer arranged on the base substrate, wherein the first conductive layer comprises a first signal line, a second signal line and an additional padding layer which are spaced apart; an electroluminescent material layer, arranged on a side of the first conductive layer away from the base substrate, wherein the electroluminescent material layer comprises a first end and a second end opposite to each other, an orthographic projection of the first end on the base substrate falls within an orthographic projection of the first signal line on the base substrate, an orthographic projection of the second end on the base substrate falls within an orthographic projection of the additional padding layer on the base substrate, and the orthographic projection of the first end on the base substrate and the orthographic projection of the second end on the base substrate are respectively located on both sides of the orthographic projection of the second signal line on the base substrate.

[0004] In some embodiments, the orthographic projection of the electroluminescent material layer on the substrate is an axially symmetric figure that is symmetrical with respect to the midline of the orthographic projection of the second signal line on the substrate, and the orthographic projection of the first end on the substrate is symmetrical with respect to the midline of the orthographic projection of the second end on the substrate.

[0005] In some embodiments, an orthographic projection of the first end on a first plane coincides with an orthographic projection of the second end on the first plane, wherein the first plane is perpendicular to the base substrate and parallel to an extension direction of the second signal line.

[0006] In some embodiments, the first signal line, the second signal line, and the additional pad layer are parallel to each other and a distance between the first signal line and the second signal line is equal to a distance between the second signal line and the additional pad layer.

[0007] In some embodiments, the electroluminescent material layer also includes a first portion adjacent to the first end and a second portion adjacent to the second end, the orthographic projection of the first portion on the substrate is located between the orthographic projection of the first signal line on the substrate and the orthographic projection of the second signal line on the substrate, and the orthographic projection of the second portion on the substrate is located between the orthographic projection of the second signal line on the substrate and the orthographic projection of the additional pad layer on the substrate.

[0008] In some embodiments, the orthographic projection of the first portion on the substrate is symmetrical to the orthographic projection of the second portion on the substrate with respect to a midline of the orthographic projection of the second signal line on the substrate.

[0009] In some embodiments, an orthographic projection of the first portion on a first plane coincides with an orthographic projection of the second portion on the first plane, wherein the first plane is perpendicular to the base substrate and parallel to an extension direction of the second signal line.

[0010] In some embodiments, the thickness of the first end portion is equal to the thickness of the second end portion, the thickness of the first portion is equal to the thickness of the second portion, and the thickness of the first portion is greater than the thickness of the first end portion.

[0011] In some embodiments, the electroluminescent material layer further includes a third portion located between the first portion and the second portion, and an orthographic projection of the third portion on the substrate falls within an orthographic projection of the second signal line on the substrate.

[0012] In some embodiments, the third portion, the first end, and the second end have equal thicknesses.

[0013] In some embodiments, the display substrate further includes: an insulating layer, which is arranged on a side of the first conductive layer away from the base substrate and fills between the first signal line and the second signal line and between the second signal line and the additional pad layer; and a first electrode, which is arranged on a side of the insulating layer away from the base substrate, wherein the electroluminescent material layer is arranged on a side of the first electrode away from the base substrate, and the orthographic projection of the electroluminescent material layer on the base substrate falls within the orthographic projection of the first electrode on the base substrate.

[0014] In some embodiments, the insulating layer is provided with a first recess and a second recess on a side away from the base substrate, the first portion of the electroluminescent material layer is partially provided in the first recess and the second portion of the electroluminescent layer is partially provided in the second recess.

[0015] In some embodiments, the display substrate further includes: an axially symmetrical figure in which the orthographic projection of the first electrode on the base substrate is symmetrical with respect to the midline of the orthographic projection of the second signal line on the base substrate, the orthographic projection of the first signal line on the base substrate and the orthographic projection of the first electrode on the base substrate have a first overlapping area, the orthographic projection of the additional pad layer on the base substrate and the orthographic projection of the first electrode on the base substrate have a second overlapping area, wherein the second overlapping area and at least a portion of the first overlapping area are symmetrical with respect to the midline of the orthographic projection of the second signal line on the base substrate.

[0016] In some embodiments, the first conductive layer further includes a first electrical connection portion, an orthographic projection of the first electrical connection portion on the base substrate does not overlap with an orthographic projection of the first electrode on the base substrate, and the additional pad layer is electrically connected to the first electrical connection portion.

[0017] In some embodiments, the additional pad layer is in direct electrical contact with the first electrical connection.

[0018] In some embodiments, the orthographic projection of the additional pad layer on the base substrate falls within the orthographic projection of the first electrode on the base substrate, and the additional pad layer is electrically connected to the first electrical connection portion through a connecting electrode.

[0019] In some embodiments, the first conductive layer includes the connecting electrode.

[0020] In some embodiments, the first conductive layer further includes a first signal terminal, an orthographic projection of the first signal terminal on the base substrate does not overlap with an orthographic projection of the first electrode on the base substrate, and the additional pad layer is electrically connected to the first signal terminal.

[0021] In some embodiments, the first signal line is a driving voltage power line, the second signal line is a data line, and the electroluminescent material layer is an electroluminescent material layer of a red electroluminescent device of a display substrate.

[0022] Some embodiments of the present disclosure provide a method for manufacturing a display substrate, comprising: forming a first conductive layer on a base substrate, wherein the first conductive layer comprises a first signal line, a second signal line and an additional pad layer spaced apart from each other; forming an electroluminescent material layer on the base substrate having the first conductive layer formed thereon, wherein the electroluminescent material layer comprises a first end and a second end opposite to each other, an orthographic projection of the first end on the base substrate falls within an orthographic projection of the first signal line on the base substrate, an orthographic projection of the second end on the base substrate falls within an orthographic projection of the additional pad layer on the base substrate, and the orthographic projection of the first end on the base substrate and the orthographic projection of the second end on the base substrate are respectively located on both sides of the orthographic projection of the second signal line on the base substrate.

[0023] In some embodiments, before forming the electroluminescent material layer, the method also includes: forming an insulating layer on a base substrate having a first conductive layer formed thereon; and forming a first electrode on a side of the insulating layer away from the base substrate, wherein the electroluminescent material layer is formed on a side of the first electrode away from the base substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It should be noted that the drawings described below only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure, wherein:

[0025] Figure 1 is a schematic diagram of pixel arrangement of an OLED display substrate according to some embodiments of the present disclosure;

[0026] Figure 2 is a circuit diagram of a driving circuit of one pixel of an OLED display substrate according to some embodiments of the present disclosure;

[0027] Figure 3 is a schematic plan view of a red pixel region of an OLED display substrate according to some embodiments of the present disclosure;

[0028] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the red pixel area taken along line AA;

[0029] Figure 5 is a schematic plan view of a red pixel region of an OLED display substrate according to some embodiments of the present disclosure;

[0030] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the red pixel area taken along line AA;

[0031] Figure 7 is a schematic plan view of a red pixel region of an OLED display substrate according to some embodiments of the present disclosure;

[0032] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure of the red pixel area taken along line AA;

[0033] Fig. 9 is a schematic plan view of a red pixel region of an OLED display substrate according to some embodiments of the present disclosure;

[0034] Fig.10 for Fig. 9 Schematic diagram of the cross-sectional structure of the red pixel area taken along line AA;

[0035] Fig.11 is a schematic plan view of a red pixel region of an OLED display substrate according to some embodiments of the present disclosure;

[0036] Fig.12 for Fig.11 Schematic diagram of the cross-sectional structure of the red pixel area taken along line AA;

[0037] Fig.13 The present invention is a flow chart of a method for manufacturing an OLED display substrate according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0038] In order to more clearly explain the purpose, technical solutions and advantages of the present disclosure, the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. It should be understood that the following description of the embodiments is intended to explain and illustrate the overall concept of the present disclosure and should not be understood as a limitation of the present disclosure. In the specification and the drawings, the same or similar reference numerals refer to the same or similar parts or components. For the sake of clarity, the drawings are not necessarily drawn to scale, and some well-known parts and structures may be omitted in the drawings.

[0039] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. The wording "one" or "an" does not exclude multiple. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right", "top" or "bottom" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. When an element such as a layer, a film, a region or a substrate substrate is referred to as being "on" or "under" another element, the element may be "directly" located "on" or "under" another element, or there may be an intermediate element.

[0040] The present disclosure provides an electroluminescent display substrate, such as an OLED display substrate. The OLED display substrate in this embodiment includes a plurality of pixels, such as a red pixel, a blue pixel and a green pixel. Figure 1 FIG. 4 shows a schematic diagram of pixel arrangement of an OLED display substrate according to some embodiments of the present disclosure. Figure 1 As shown, in this embodiment, the pixels of the OLED display substrate are arranged in a GGRB manner, and the ratio of the number of red pixels to the number of blue pixels and the number of green pixels is 1:1:2. Figure 1 The dotted box in the middle shows a cycle unit of a pixel combination, which includes 1 red pixel R, 1 blue pixel B and two green pixels G, namely the first green pixel G1 and the second green pixel G2. In this embodiment, the red pixel R and the blue pixel B are both hexagonal, and the first green pixel G1 and the second green pixel G2 are symmetrical pentagons. The red pixel R, the blue pixel B and the first green pixel G1 and the second green pixel G2 are all axially symmetrical figures. In other embodiments, the red pixel R, the blue pixel B and the first green pixel G1 and the second green pixel G2 can also adopt other shapes.

[0041] In this embodiment, each pixel has an organic light emitting device (such as OLED) and a pixel driving circuit. Figure 2 is a circuit diagram of a driving circuit of a pixel of an OLED display substrate according to some embodiments of the present disclosure. Figure 2The pixel driving circuit has a 7T1C structure, that is, it includes transistors T1, T2, T3, T4, T5, T6, T7 and a capacitor Cst, wherein transistor T3 is a driving transistor. ELVDD represents the ELVDD voltage applied by the power line, EM represents the emission control signal from the emission control line, Data represents the data signal from the data line, Gate represents the scanning signal from the gate line, Reset represents the reset signal, which can be applied by the previous gate line, Vinit represents the initialization voltage, and ELVSS represents the ELVSS voltage applied by the power line.

[0042] The gate of the transistor T3 is connected to the first capacitor plate Cst1 of the capacitor Cst, for example, the gate of the transistor T3 and the first capacitor plate Cst1 of the capacitor Cst are electrically connected to the first node N1. The source of the transistor T3 is connected to the ELVDD power line through the transistor T5. The drain of the transistor T3 is electrically connected to the organic light emitting device (e.g., OLED) through the transistor T6, for example, the drain of the transistor T3 and the transistor T6 are electrically connected to the second node N2. The transistor T3 receives the data signal Data according to the switching operation of the transistor T4, and supplies the driving current Id to the organic light emitting device.

[0043] The gate of transistor T4 is connected to the gate line, the source is connected to the data line, the drain is connected to the source of transistor T3 and connected to the ELVDD power line through transistor T5. For example, the source of transistor T3, the drain of transistor T4 and the drain of transistor T5 are electrically connected to the third node N3.

[0044] The gate of the transistor T2 is connected to the gate line, the source is connected to the drain of the transistor T3 and is connected to the organic light emitting device through the transistor T6, and the drain is connected to the first capacitor plate Cst1 of the capacitor Cst, the drain of the transistor T1, and the gate of the transistor T3. For example, the drain of the transistor T2, the first capacitor plate Cst1 of the capacitor Cst, the drain of the transistor T1, and the gate of the transistor T3 are electrically connected to the first node N1. The transistor T2 is turned on according to the scan signal Gate from the gate line to electrically connect the gate and the drain of the transistor T3, thereby placing the transistor T3 in a diode connection state.

[0045] The gate of the transistor T1 receives the reset signal Reset, the source receives the initialization voltage Vinit, and the drain is connected to the first node N1. The transistor T1 is turned on according to the reset signal Reset to transmit the initialization voltage Vinit to the gate of the transistor T3.

[0046] The transistor T5 has a gate that receives the emission control signal EM, a source that is connected to the ELVDD power line, and a drain that is connected to the third node N3.

[0047] The gate of transistor T6 receives the emission control signal EM, the source is connected to the second node N2, and the drain is connected to the source of transistor T7 and the organic light-emitting device. For example, the drain of transistor T6, the source of transistor T7 and the organic light-emitting device are electrically connected to the fourth node N4. Transistor T5 and transistor T6 are turned on at the same time according to the emission control signal EM.

[0048] The gate of the transistor T7 is connected to the gate line to receive the scan signal Gate, the source is connected to the fourth node N4, and the drain receives the initialization voltage Vinit.

[0049] The capacitor Cst further includes a second capacitor plate Cst2 connected to the ELVDD power line, and a first electrode (e.g., an anode) of the organic light emitting device is connected to the fourth node N4, and a second electrode (e.g., a cathode) is connected to the ELVSS power line. Therefore, the organic light emitting device of the pixel can emit light based on the driving current from the transistor T3.

[0050] Figure 3 A schematic plan view of a red pixel region of an OLED display substrate according to some embodiments of the present disclosure is shown. Figure 4 Shows Figure 3 Schematic diagram of the cross-sectional structure of the red pixel area taken along line AA. Figure 3 and 4 As shown, the red pixel region includes a substrate 10 and a first conductive layer 11 disposed on the substrate 10. The first conductive layer 11 includes a first signal line 111 disposed at intervals from each other, such as a driving voltage power line (i.e., an ELVDD power line), a second signal line 112, such as a data line, a first electrical connection portion N1, such as a first node, and a first signal terminal 113, such as an initialization voltage terminal. The insulating layer 14 covers the first conductive layer 11. Since the components in the first conductive layer 11 are disposed at intervals from each other, the surface of the insulating layer 14 away from the substrate 10 is not flat and presents an uneven surface. The first electrode 13 of the red pixel, such as an anode, is disposed on the side of the insulating layer 14 away from the substrate 10 and conforms to the surface shape of the insulating layer 144 away from the substrate 10. The electroluminescent material layer 12 of the red pixel, such as an organic light-emitting material layer, is disposed on the side of the first electrode 13 away from the substrate 10. The electroluminescent material layer 12 can be formed in the groove surrounded by the pixel defining layer 16. Figure 3 In order to clearly show the positional relationship of various components, the base substrate 10, the insulating layer 14 and the pixel defining layer 16 are omitted.

[0051] See also Figure 3 and Figure 4As shown, the orthographic projections of the first electrode 13 and the electroluminescent material layer 12 of the red pixel on the substrate 10 are both symmetrical figures with the orthographic projection of the second signal line 112 on the substrate 10 as the symmetry axis, and are both hexagonal. The orthographic projection of the electroluminescent material layer 12 of the red pixel on the substrate 10 falls within the orthographic projection of the first electrode 13 of the electroluminescent material layer 12 of the red pixel on the substrate 10. The orthographic projections of the first electrode 13 and the electroluminescent material layer 12 of the red pixel on the substrate 10 both overlap with the orthographic projection of the first signal line 111 on the substrate 10, and the orthographic projections of the first electrode 13 and the electroluminescent material layer 12 of the red pixel on the substrate 10 both overlap with the orthographic projection of the second signal line 112 on the substrate 10. There is no overlapping area between the orthographic projection of the first electrode 13 of the red pixel and the electroluminescent material layer 12 on the base substrate 10 and the orthographic projection of the first node N1 on the base substrate 10, and there is no overlapping area between the orthographic projection of the first electrode 13 of the red pixel and the electroluminescent material layer 12 on the base substrate 10 and the orthographic projection of the first signal terminal 113 on the base substrate 10.

[0052] The inventor discovered Figure 3 and Figure 4 The red pixels of the OLED display substrate in the embodiment of the present invention have color deviation. The inventors believe that the causes of this color deviation are as follows: Figure 3 and 4 As shown, the left edge area of ​​the electroluminescent material layer 12 of the red pixel overlaps with the first conductive layer 11 (first signal line 111), while the left edge area of ​​the electroluminescent material layer 12 does not overlap with the first conductive layer 11, which results in different thicknesses of the left and right edge areas of the electroluminescent material layer 12, which in turn causes color difference when the red pixel emits light.

[0053] In order to overcome the above-mentioned problems, some embodiments of the present disclosure provide a display substrate, a display substrate comprising: a base substrate; a first conductive layer arranged on the base substrate, wherein the first conductive layer comprises a first signal line, a second signal line and an additional pad layer which are spaced apart; an electroluminescent material layer, arranged on a side of the first conductive layer away from the base substrate, the electroluminescent material layer comprising a first end and a second end opposite to each other, the orthographic projection of the first end on the base substrate falls within the orthographic projection of the first signal line on the base substrate, the orthographic projection of the second end on the base substrate falls within the orthographic projection of the additional pad layer on the base substrate, the orthographic projection of the first end on the base substrate and the orthographic projection of the second end on the base substrate are respectively located on both sides of the orthographic projection of the second signal line on the base substrate. In the present disclosure, an additional cushion layer is provided on the same layer as the first signal line, so that the additional cushion layer raises the right edge area of ​​the pixel, for example, the red pixel, so that the left edge area and the right edge area of ​​the pixel are basically symmetrical in structure. At this time, the left edge area and the right edge area of ​​the electroluminescent material layer of the red pixel have the same thickness and are basically located at the same height, so that the left edge area and the right edge area of ​​the red pixel emit basically the same light, thereby reducing color deviation.

[0054] Figure 5 A schematic plan view of a red pixel region of an OLED display substrate according to some embodiments of the present disclosure is shown. Figure 6 Shows Figure 5 Schematic diagram of the cross-sectional structure of the red pixel area taken along line AA. Figure 5 and 6As shown, the red pixel region includes a base substrate 10 and a first conductive layer 11 disposed on the base substrate 10, the first conductive layer 11 includes a first signal line 111 (for example, an ELVDD power line, which is described in the following embodiments by taking the ELVDD power line as an example, so it can also be referred to as the ELVDD power line 111), a second signal line 112 (for example, a data line, which is described in the following embodiments by taking the data line as an example, so it can also be referred to as the data line 112), a first electrical connection portion N1 (for example, a first node, which is described in the following embodiments by taking the first node as an example, so it can also be referred to as the first node N1), and a first signal terminal 113 (for example, an initialization voltage terminal, which is described in the following embodiments by taking the initialization voltage terminal as an example, so it can also be referred to as the initialization voltage terminal 113). In addition, the first conductive layer 11 also includes an additional pad layer 17, which can be disposed in the same layer as the first signal line 111, the second signal line 112, the first electrical connection portion N1, and the first signal terminal 113, for example, can be formed using the same material and the same patterning process. The first conductive layer 11 is usually arranged on a flat surface, so that the first signal line 111, the second signal line 112, the first electrical connection portion N1, the first signal terminal 113, and the surface of the additional pad layer 17 close to the base substrate 10 are equidistant from the base substrate 10 and have the same thickness.

[0055] In some embodiments, the red pixel area also includes other layer structures 15 arranged between the base substrate 10 and the first conductive layer 11, such as a gate layer, an active layer, a planar layer, etc. The surface of the other layer structure 15 in contact with the first conductive layer 11 is generally flat to facilitate the formation of the first conductive layer 11.

[0056] like Figure 5 and 6 As shown, the insulating layer 14 covers the first conductive layer 11. The first electrode 13 of the red pixel (for example, an anode, the following embodiments are described by taking the anode as an example, so it can also be referred to as the anode 13 below) is arranged on the side of the insulating layer 14 away from the substrate 10, and conforms to the surface shape of the insulating layer 14 away from the substrate 10. The electroluminescent material layer 12 of the red pixel, for example, an organic light-emitting material layer, is arranged on the side of the first electrode 13 away from the substrate 10. The electroluminescent material layer 12 can be formed in a groove surrounded by the pixel defining layer 16, and can include a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer stacked in sequence away from the substrate. Figure 5 In order to clearly show the positional relationship of various components, the base substrate 10, the insulating layer 14 and the pixel defining layer 16 are omitted.

[0057] See also Figure 5 and Figure 6, the electroluminescent material layer 12 includes a first end 121 and a second end 122 that are arranged opposite to each other, and are respectively located at the left and right ends of the electroluminescent material layer 12. The orthographic projection of the first end 121 on the base substrate 10 falls within the orthographic projection of the ELVDD power line 111 on the base substrate 10. That is, the orthographic projection of the electroluminescent material layer 12 on the base substrate 10 and the orthographic projection of the ELVDD power line 111 on the base substrate 10 have an overlapping area, and the orthographic projection of the first end 121 on the base substrate 10 falls within the overlapping area or coincides with the overlapping area. The orthographic projection of the second end 122 on the base substrate 10 falls within the orthographic projection of the additional pad layer 17 on the base substrate 10. That is, the orthographic projection of the electroluminescent material layer 12 on the base substrate 10 and the orthographic projection of the additional pad layer 117 on the base substrate 10 have an overlapping area, and the orthographic projection of the second end 122 on the base substrate 10 falls within the overlapping area or coincides with the overlapping area. By providing an additional pad layer disposed on the same layer as the first signal line, the additional pad layer is arranged to pad the right edge area of ​​the red pixel to compensate for Figure 3 and Figure 4 The color difference caused by the different thicknesses of the left and right edge regions of the electroluminescent material layer 12 in the illustrated embodiment.

[0058] In some embodiments, see Figure 5 , 6 As shown, the orthographic projection of the electroluminescent material layer 12 on the substrate 10 is a symmetrical figure with the midline of the orthographic projection of the data line 112 on the substrate 10 as the symmetry axis, for example, a hexagon. In the present disclosure, the orthographic projection of the data line 12 on the substrate 10 is a long strip, and the midline of the orthographic projection of the data line 12 on the substrate 10 extends along the direction in which the data line 12 extends. The orthographic projection of the first end 121 of the electroluminescent material layer 12 on the substrate 10 and the orthographic projection of the second end 122 on the substrate 10 are symmetrical relative to the midline of the orthographic projection of the data line 12 on the substrate 10. The shape and area of ​​the orthographic projection of the first end 121 on the substrate 10 are substantially the same as the shape and area of ​​the orthographic projection of the second end 121 on the substrate 10. Therefore, the right edge area of ​​the electroluminescent material layer 12 of the red pixel padded by the additional pad layer is substantially the same as the left edge area padded by the ELVDD power line 111, which is conducive to reducing edge color difference.

[0059] In some embodiments, see Figure 5 , 6As shown, the orthographic projection of the first end 121 on the first plane M coincides with the orthographic projection of the second end 122 on the first plane M, wherein the first plane M is perpendicular to the substrate 10 and parallel to the extension direction of the data line 112, and the first plane M may be a midline including the orthographic projection of the data line 112 on the substrate 10, that is, the midline of the orthographic projection of the data line 112 on the substrate 10 may be located on the first plane M. The distance between the surface of the first end 121 of the electroluminescent material layer 12 of the red pixel facing the substrate 10 and the substrate 10 is substantially equal to the distance between the surface of the second end 122 facing the substrate 10 and the substrate 10, and the first end 121 and the second end 122 have the same thickness, both of which are the first thickness d1. It can be understood that the first end 121 and the second end 122 are at the same height and have the same thickness. The first end 121 and the second end 122 of the electroluminescent material layer 12 are substantially symmetrical with respect to the first plane M. At this time, the right edge region of the electroluminescent material layer 12 of the red pixel padded by the additional pad layer and the left edge region padded by the ELVDD power line 111 are at the same height and have the same thickness, which is beneficial to reducing edge color difference.

[0060] In some embodiments, Figure 5 and Figure 6 , the additional pad layer 17 is spaced apart from the ELVDD power line 111, the data line 112, the first node N1, and the first signal terminal 113. Specifically, the ELVDD power line 111, the data line 112, and the additional pad layer 17 are parallel to each other and are arranged in sequence at equal intervals. That is, the distance between the ELVDD power line 111 and the data line 112 is equal to the distance between the data line 112 and the additional pad layer 17.

[0061] In some embodiments, Figure 5 , 6 As shown, since the first conductive layer 11 is usually arranged on a flat surface, and there is a gap between the ELVDD power line 111 and the data line 112 in the first conductive layer 11, and between the data line 112 and the additional pad layer 17, the surface of the insulating layer 14 formed later covering the first conductive layer 11 away from the base substrate 10 is not flat, and the insulating layer 14 is provided with a first recess 141 and a second recess 142 on the side away from the base substrate. The orthographic projection of the first recess 141 on the base substrate 10 is located between the orthographic projection of the ELVDD power line 111 on the base substrate 10 and the orthographic projection of the data line 112 on the base substrate 10. The orthographic projection of the second recess 142 on the base substrate 10 is located between the orthographic projection of the additional pad layer 17 on the base substrate 10 and the orthographic projection of the data line 112 on the base substrate 10. The anode 13 arranged on the side of the insulating layer 14 away from the base substrate 10 conforms to the surface shape of the side of the insulating layer 14 away from the base substrate 10.

[0062] In some embodiments, Figure 5 , 6 As shown, the electroluminescent material layer 12 further includes a first portion 123 adjacent to the first end 121 and a second portion 124 adjacent to the second end 122. The first portion 123 of the electroluminescent material layer 12 is partially located in the first recess 141, and the second portion 124 is partially located in the second recess 142. The orthographic projection of the first portion 123 on the substrate substrate 10 is located between the orthographic projection of the ELVDD power line 111 on the substrate substrate 10 and the orthographic projection of the data line 112 on the substrate substrate 10. That is, the orthographic projection of the first portion 123 on the substrate substrate 10 does not overlap with the orthographic projection of the ELVDD power line 111 on the substrate substrate 10 and the orthographic projection of the data line 112 on the substrate substrate 10. The orthographic projection of the second portion 124 on the substrate substrate 10 is located between the orthographic projection of the additional pad layer 17 on the substrate substrate 10 and the orthographic projection of the data line 112 on the substrate substrate 10. That is, the orthographic projection of the second portion 124 on the base substrate 10 does not overlap with the orthographic projection of the additional pad layer 17 on the base substrate 10 and the orthographic projection of the data line 112 on the base substrate 10 .

[0063] Continue to refer Figure 5 , 6 , the orthographic projection of the first part 123 on the substrate 10 and the orthographic projection of the second part 124 on the substrate 10 are substantially symmetrical with respect to the midline of the orthographic projection of the data line 10 on the substrate 10, and the orthographic projection of the first part 123 on the first plane M coincides with the orthographic projection of the second part 124 on the first plane M, that is, the first part 123 and the second part 124 of the electroluminescent material layer 12 are substantially symmetrical with respect to the first plane M. The distance between the surface of the first part 123 of the electroluminescent material layer 12 facing the substrate 10 and the substrate 10 is substantially equal to the distance between the surface of the second part 122 facing the substrate 10 and the substrate 10, and the first part 123 and the second part 124 have the same thickness, both of which are the second thickness d2. It can be understood that the first part 123 and the second part 124 are at the same height and have the same thickness. Due to the interval between the ELVDD power line 111 and the data line 112 and the interval between the data line 112 and the additional pad layer 17, the second thickness d2 is greater than the first thickness d1.

[0064] Continue to refer Figure 5 , 6, the electroluminescent material layer 12 further includes a third portion 125 located between the first portion 123 and the second portion 124. The orthographic projection of the third portion 125 on the base substrate 10 is located within the orthographic projection of the data line 112 on the base substrate 10. The thickness of the third portion 125 is substantially the same as the thickness of the first end portion 121 and the second end portion 122, both of which are the first thickness d1. Therefore, the electroluminescent material layer 12 is substantially symmetrical relative to the first plane M as a whole, so that the left area and the right area of ​​the red pixel emit light substantially the same, reducing color deviation.

[0065] In some embodiments, Figure 5 and 6 As shown, the orthographic projection of the anode 13 of the red pixel on the substrate 10 is symmetrical with respect to the midline of the orthographic projection of the data line 112 on the substrate 10, and is, for example, a hexagon. The orthographic projection of the ELVDD power line 111 on the substrate 10 and the orthographic projection of the anode 13 on the substrate 10 have a first overlapping region, and the orthographic projection of the additional pad layer 17 on the substrate 10 and the orthographic projection of the anode 13 on the substrate 10 have a second overlapping region, and at least a portion of the second overlapping region and the first overlapping region are symmetrical with respect to the midline of the orthographic projection of the data line 112 on the substrate 10. The orthographic projection of the first end 121 of the electroluminescent material layer 12 of the red pixel on the substrate 10 falls within the first overlapping region, and the orthographic projection of the second end 122 on the substrate 10 falls within the second overlapping region. Therefore, at the left and right ends of the red pixel, the effects of the voltage applied by the anode 13 on the first end 121 and the second end 122 of the electroluminescent material layer 12 are basically the same, so that the luminous effects of the left and right ends of the red pixel are basically the same, reducing color difference.

[0066] In some embodiments, Figure 5 and 6 As shown, the orthographic projection of the additional pad layer 17 on the base substrate 10 falls within the orthographic projection of the anode 13 on the base substrate 10, and the orthographic projection of the first node N1 on the base substrate 10 does not overlap with the orthographic projection of the anode 13 on the base substrate 10. The orthographic projection of the first signal terminal 113 on the base substrate 10 does not overlap with the orthographic projection of the anode 13 on the base substrate 10. At this time, the additional pad layer 17, the first node N1, and the first signal terminal 113 are insulated from each other.

[0067] Figure 7 A schematic plan view of a red pixel region of an OLED display substrate according to some embodiments of the present disclosure is shown. Figure 8 Shows Figure 7 Schematic diagram of the cross-sectional structure of the red pixel region in FIG. 1 taken along line AA. In these embodiments, the structure of the red pixel region of the OLED display substrate is similar to Figure 5 and Figure 6 The red pixel region structures of the OLED display substrates in the corresponding embodiments are substantially the same, and the differences between the two are mainly described below.

[0068] like Figure 7 and Figure 8 As shown, the additional pad layer 17' is directly electrically connected to the first node N1. Figure 7 , 8 The boundary between the additional pad layer 17' and the first node N1 is shown in the figure, but it can be understood by those skilled in the art that the additional pad layer 17' is connected to the first node N1 as a whole, and the additional pad layer 17' can be considered to be extended from the first node N1 toward the data line 112. In this embodiment, the orthographic projection of the additional pad layer 17' on the base substrate 10 does not fall within the orthographic projection of the anode 13 on the base substrate 10, but has an overlapping area with the orthographic projection of the anode 13 on the base substrate 10. The structural process of directly electrically connecting the additional pad layer 17' to the first node N1 is simple and easy to manufacture. And because the additional pad layer 17' is directly electrically connected to the first node N1, it can be avoided that the additional pad layer 17' forms an island and accumulates static electricity to cause adverse effects on the display substrate.

[0069] Fig. 9 A schematic plan view of a red pixel region of an OLED display substrate according to some embodiments of the present disclosure is shown. Fig.10 Shows Fig. 9 Schematic diagram of the cross-sectional structure of the red pixel region in FIG. 1 taken along line AA. In these embodiments, the structure of the red pixel region of the OLED display substrate is similar to Figure 5 and Figure 6 The red pixel region structures of the OLED display substrates in the corresponding embodiments are substantially the same, and the differences between the two are mainly described below.

[0070] like Fig. 9 and Fig.10 As shown, the additional pad layer 17" is electrically connected to the first node N1 through the connecting electrode 18. For example, one end of the connecting electrode 18 can be connected to one end of the first node N1, for example Fig.10 The lower end is electrically connected to the electrode 18, and the other end of the electrode 18 can be connected to one end of the additional pad layer 17", for example Fig.10 In other embodiments, the connection electrode 18 may also be connected to other regions of the first node N1, or may also be connected to other regions of the additional pad layer 17".

[0071] In some embodiments, the connecting electrode 18 can be arranged in the same layer and the same material as the additional pad layer 17" and the first node N1, that is, the connecting electrode 18 can also be a part of the first conductive layer 11. Such a configuration allows the connecting electrode 18 to be formed using the same patterning process as the additional pad layer 17" and the first node N1. For example, the connecting electrode 18 can be formed integrally with the additional pad layer 17" and the first node N1, thereby reducing manufacturing costs. In some embodiments, the connecting electrode 18 can be located in a different layer from the additional pad layer 17" and the first node N1, as long as the connecting electrode 18 can ensure electrical connection between the additional pad layer 17" and the first node N1. And because the additional pad layer 17" is electrically connected to the first node N1, it can avoid the additional pad layer 17' from forming an island and accumulating static electricity to affect the display substrate.

[0072] Fig.11 A schematic plan view of a red pixel region of an OLED display substrate according to some embodiments of the present disclosure is shown. Fig.12 Shows Fig.11 Schematic diagram of the cross-sectional structure of the red pixel region in FIG. 1 taken along line AA. In these embodiments, the structure of the red pixel region of the OLED display substrate is similar to Figure 5 and Figure 6 The red pixel region structures of the OLED display substrates in the corresponding embodiments are substantially the same, and the differences between the two are mainly described below.

[0073] like Fig.11 and Fig.12 As shown, the additional pad 17' is electrically connected to the first signal terminal 113, for example, the additional pad 17"' is in direct electrical contact with the first signal terminal 113. Fig.11 , 12 The boundary between the additional pad 17'" and the first signal terminal 113 is shown in the figure, but those skilled in the art can understand that the additional pad 17'" is connected to the first signal terminal 113 as a whole, and the additional pad 17'" can be considered to be extended from the first signal terminal 113 toward the data line 112. In this embodiment, the orthographic projection of the additional pad 17'" on the base substrate 10 does not fall within the orthographic projection of the anode 13 on the base substrate 10, but has an overlapping area with the orthographic projection of the anode 13 on the base substrate 10. The structural process of directly electrically connecting the additional pad 17'" and the first signal terminal 113 is simple and easy to manufacture. And because the additional pad 17'" is directly electrically connected to the first signal terminal 113, it can be avoided that the additional pad 17'" forms an island and accumulates static electricity to cause adverse effects on the display substrate.

[0074] In other embodiments, the additional pad layer 17''' may be electrically connected to the first signal terminal 113 via a connecting electrode. The connecting electrode may be disposed in the same layer as the additional pad layer 17''' and the first signal terminal 113, or may be disposed in different layers.

[0075] The above embodiments of the present disclosure are basically described for the red pixel area of ​​the OLED display substrate. It can be understood by those skilled in the art that for pixel areas of other colors, if there are Figure 3 and Figure 4 The color deviation problem caused by the structure similar to the structure in the corresponding embodiment can also be solved by the solution in the aforementioned embodiment.

[0076] Some embodiments of the present disclosure provide a display device, which may include the display substrate in the above embodiments. The display device may be any product or component with display and camera functions, such as a television, a monitor, a digital photo frame, a mobile phone, a smart watch, and a tablet computer.

[0077] Some embodiments of the present disclosure provide a method for manufacturing a display substrate. Fig.13 FIG. 1 is a flow chart showing a method for manufacturing a display substrate according to some embodiments of the present disclosure. Fig.13 As shown, the manufacturing method of the display substrate includes the following steps:

[0078] S10: forming a first conductive layer on the base substrate, wherein the first conductive layer comprises a first signal line, a second signal line and an additional pad layer which are spaced apart from each other.

[0079] S40: forming an electroluminescent material layer on the base substrate having the first conductive layer formed thereon.

[0080] Specifically, in some embodiments, in step S10, a first conductive material layer may be deposited on the base substrate, and the first conductive material layer may be patterned using a single patterning process to form a first conductive layer including mutually spaced first signal lines, second signal lines, and an additional pad layer.

[0081] Specifically, in some embodiments, in step S20, a pixel defining material layer can be coated on a base substrate having a first conductive layer formed thereon, and a portion of the pixel defining material layer can be removed through a patterning process to form a pixel defining layer and a groove surrounded by the pixel defining layer, and an electroluminescent material is filled into the groove layer to form an electroluminescent material layer.

[0082] Based on the above method, Figure 5The structure of the red pixel area of ​​the OLED display substrate shown in . In the above structure formed by the above method, the electroluminescent material layer includes a first end and a second end relative to each other, the orthographic projection of the first end on the substrate falls within the orthographic projection of the first signal line on the substrate, the orthographic projection of the second end on the substrate falls within the orthographic projection of the additional padding layer on the substrate, and the orthographic projection of the first end on the substrate and the orthographic projection of the second end on the substrate are respectively located on both sides of the orthographic projection of the second signal line on the substrate. By arranging the additional padding layer arranged in the same layer as the first signal line, the additional padding layer is arranged to pad the right edge area of ​​the pixel, for example, the red pixel, so that the left edge area and the right edge area of ​​the pixel are basically symmetrical in structure. At this time, the thickness of the left edge area and the right edge area of ​​the electroluminescent material layer of the red pixel are the same and basically symmetrical, so that the left edge area and the right edge area of ​​the red pixel emit basically the same light, reducing color deviation.

[0083] In some embodiments, before forming the electroluminescent material layer, Fig.13 As shown, the manufacturing method of the display substrate further includes the following steps:

[0084] S20: forming an insulating layer on the base substrate having the first conductive layer formed thereon;

[0085] S30: forming a first electrode on a side of the insulating layer away from the base substrate.

[0086] In step S20, the insulating layer may be formed by a deposition process to cover the first conductive layer including the first signal line, the second signal line and the additional pad layer that are spaced apart from each other, and to fill in between adjacent two of the first signal line, the second signal line and the additional pad layer.

[0087] In step S30 , the first electrode may be formed by using a patterning process. The first electrode is formed on a surface of the insulating layer away from the base substrate and is formed in accordance with the shape of the surface.

[0088] Although the present disclosure is described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the embodiments of the present disclosure and should not be construed as limiting the present disclosure. The dimensional ratios in the drawings are merely illustrative and should not be construed as limiting the present disclosure.

[0089] The above embodiments are merely illustrative of the principles and structures of the present disclosure, and are not intended to limit the present disclosure. It should be understood by those skilled in the art that any changes and improvements made to the present disclosure without departing from the overall concept of the present disclosure are within the scope of the present disclosure. The scope of protection of the present disclosure shall be subject to the scope defined by the claims of this application.

Claims

1. A display substrate, comprising: substrate substrate; A first conductive layer is disposed on the substrate, wherein the first conductive layer includes a first signal line, a second signal line and an additional pad layer which are spaced apart from each other; an electroluminescent material layer, arranged on a side of the first conductive layer away from the base substrate, The electroluminescent material layer comprises a first end and a second end opposite to each other, the orthographic projection of the first end on the base substrate falls within the orthographic projection of the first signal line on the base substrate, the orthographic projection of the second end on the base substrate falls within the orthographic projection of the additional cushion layer on the base substrate, and the orthographic projection of the first end on the base substrate and the orthographic projection of the second end on the base substrate are respectively located on both sides of the orthographic projection of the second signal line on the base substrate; In which, the electroluminescent material layer also includes a first part adjacent to the first end and a second part adjacent to the second end, the orthographic projection of the first part on the base substrate is located between the orthographic projection of the first signal line on the base substrate and the orthographic projection of the second signal line on the base substrate, and the orthographic projection of the second part on the base substrate is located between the orthographic projection of the second signal line on the base substrate and the orthographic projection of the additional pad layer on the base substrate.

2. The display substrate according to claim 1, wherein: The orthographic projection of the electroluminescent material layer on the substrate is an axially symmetrical figure that is symmetrical with respect to the midline of the orthographic projection of the second signal line on the substrate, and the orthographic projection of the first end on the substrate and the orthographic projection of the second end on the substrate are symmetrical with respect to the midline of the orthographic projection of the second signal line on the substrate.

3. The display substrate according to claim 2, wherein: An orthographic projection of the first end on a first plane coincides with an orthographic projection of the second end on the first plane, wherein the first plane is perpendicular to the base substrate and parallel to an extending direction of the second signal line.

4. The display substrate according to claim 3, wherein: The first signal line, the second signal line and the additional pad layer are parallel to each other, and a distance between the first signal line and the second signal line is equal to a distance between the second signal line and the additional pad layer.

5. The display substrate according to claim 1, wherein: The orthographic projection of the first portion on the substrate and the orthographic projection of the second portion on the substrate are symmetrical with respect to a midline of the orthographic projection of the second signal line on the substrate.

6. The display substrate according to claim 1, wherein: The orthographic projection of the first portion on the first plane coincides with the orthographic projection of the second portion on the first plane, wherein the first plane is perpendicular to the base substrate and parallel to the extension direction of the second signal line.

7. The display substrate according to claim 1, wherein: The thickness of the first end portion is equal to the thickness of the second end portion, the thickness of the first portion is equal to the thickness of the second portion, and the thickness of the first portion is greater than the thickness of the first end portion.

8. The display substrate according to claim 1, wherein: The electroluminescent material layer further includes a third portion located between the first portion and the second portion, and an orthographic projection of the third portion on the base substrate falls within an orthographic projection of the second signal line on the base substrate.

9. The display substrate according to claim 8, wherein: The third portion, the first end portion and the second end portion have equal thickness.

10. The display substrate according to claim 1, further comprising: An insulating layer, disposed on a side of the first conductive layer away from the base substrate and filled between the first signal line and the second signal line and between the second signal line and the additional pad layer; as well as A first electrode is disposed on a side of the insulating layer away from the substrate. The electroluminescent material layer is arranged on a side of the first electrode away from the base substrate, and an orthographic projection of the electroluminescent material layer on the base substrate falls within an orthographic projection of the first electrode on the base substrate.

11. The display substrate according to claim 10, wherein: The insulating layer is provided with a first recess and a second recess on a side away from the base substrate, the first portion of the electroluminescent material layer is partially provided in the first recess and the second portion of the electroluminescent layer is partially provided in the second recess.

12. The display substrate according to claim 10, further comprising: The orthographic projection of the first electrode on the substrate is an axially symmetric figure that is symmetric with respect to the midline of the orthographic projection of the second signal line on the substrate, the orthographic projection of the first signal line on the substrate and the orthographic projection of the first electrode on the substrate have a first overlapping region, the orthographic projection of the additional pad on the substrate and the orthographic projection of the first electrode on the substrate have a second overlapping region, wherein the second overlapping region and at least a portion of the first overlapping region are symmetric with respect to the midline of the orthographic projection of the second signal line on the substrate.

13. The display substrate according to claim 10, wherein the first conductive layer further comprises a first electrical connection portion, an orthographic projection of the first electrical connection portion on the base substrate does not overlap with an orthographic projection of the first electrode on the base substrate, and the additional pad layer is electrically connected to the first electrical connection portion. The display substrate according to claim 13 , wherein the additional pad layer is in direct electrical contact with the first electrical connection portion.

15. The display substrate according to claim 13, wherein: The orthographic projection of the additional pad layer on the base substrate falls within the orthographic projection of the first electrode on the base substrate, and the additional pad layer is electrically connected to the first electrical connection portion through the connecting electrode.

16. The display substrate according to claim 15, wherein: The first conductive layer includes the connecting electrode.

17. The display substrate according to claim 10, wherein the first conductive layer further comprises a first signal terminal, an orthographic projection of the first signal terminal on the base substrate does not overlap with an orthographic projection of the first electrode on the base substrate, and the additional pad layer is electrically connected to the first signal terminal.

18. The display substrate according to any one of claims 1 to 17, wherein the first signal line is a driving voltage power line, the second signal line is a data line, and the electroluminescent material layer is an electroluminescent material layer of a red electroluminescent device of the display substrate.

19. A method for manufacturing a display substrate according to any one of claims 1 to 18, comprising: Forming a first conductive layer on the base substrate, wherein the first conductive layer includes a first signal line, a second signal line and an additional pad layer which are spaced apart from each other; forming an electroluminescent material layer on the base substrate having the first conductive layer formed thereon, Wherein, the electroluminescent material layer includes a first end and a second end relative to each other, the orthographic projection of the first end on the base substrate falls within the orthographic projection of the first signal line on the base substrate, the orthographic projection of the second end on the base substrate falls within the orthographic projection of the additional pad on the base substrate, and the orthographic projection of the first end on the base substrate and the orthographic projection of the second end on the base substrate are respectively located on both sides of the orthographic projection of the second signal line on the base substrate.

20. The method according to claim 19, before forming the electroluminescent material layer, further comprising: forming an insulating layer on the base substrate having the first conductive layer formed thereon; as well as forming a first electrode on a side of the insulating layer away from the base substrate, The electroluminescent material layer is formed on a side of the first electrode away from the substrate.

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