Display substrate and display device

Abstract

The invention provides a display substrate and a display device, and belongs to the technical field of display. The display substrate comprises a substrate base plate, and the substrate base plate comprises a display area and a frame area surrounding the display area; the first dam part is located in the frame area and surrounds the display area; the second dam part is located in the frame area, the maximum width of the second dam part in the direction perpendicular to the extending direction of the second dam part is smaller than the maximum width of the first dam part in the direction perpendicular to the extending direction of the first dam part, and the second dam part is located on the side, close to the display area, of the first dam part. According to the embodiment of the invention, the narrow frame of the display substrate can be realized under the condition that the packaging performance is ensured.

Description

Display substrate and display device Technical Field

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

[0002] Organic Light Emitting Diode (OLED) display substrates are widely used in various fields due to their advantages, including lightness, high brightness, low power consumption, fast response, high clarity, good flexibility, and high luminous efficiency. However, despite these advantages, OLED display substrates still suffer from the problem of wide bezels. This wide bezel can affect the user experience, so achieving a narrow bezel on display substrates has become an urgent issue.

[0003] Summary of the Invention

[0004] Embodiments of the present disclosure provide a display substrate and a display device, which can achieve a narrow frame of the display substrate while ensuring packaging performance.

[0005] To solve the above technical problems, the embodiments of the present disclosure provide the following technical solutions:

[0006] In one aspect, a display substrate is provided, comprising:

[0007] a base substrate, the base substrate comprising a display area and a frame area surrounding the display area;

[0008] a first dam portion located in the frame area and surrounding the display area;

[0009] A second dam portion is located in the frame area, and the maximum width of the second dam portion in a direction perpendicular to its own extension direction is smaller than the maximum width of the first dam portion in a direction perpendicular to its own extension direction. The second dam portion is located on the side of the first dam portion close to the display area.

[0010] In some embodiments, a low-voltage signal line VSS is provided in the border area, and the border area includes a first area and a second area where the end portion of the VSS is located, the first area and the second area are symmetrical relative to the display area, and the second dam portion includes a first dam structure provided in the first area and / or the second area.

[0011] In some embodiments, the border region further includes a third region located between the first region and the second region, and the second dam portion further includes a second dam structure extending from the first region through the third region to the second region.

[0012] In some embodiments, the display substrate includes a pixel defining layer, and an orthographic projection of the pixel defining layer on the base substrate does not overlap with a portion of the first region; and / or

[0013] An orthographic projection of the pixel defining layer on the base substrate does not overlap with a portion of the second region.

[0014] In some embodiments, the first region includes a first subregion where the first dam structure is located and a second subregion outside the first subregion, and the orthographic projection of the pixel defining layer on the substrate does not overlap with the second subregion; and / or

[0015] The second region includes a third subregion where the first dam structure is located and a fourth subregion outside the third subregion, and an orthographic projection of the pixel defining layer on the base substrate does not overlap with the fourth subregion.

[0016] In some embodiments, an extension direction of the second dam structure is parallel or substantially parallel to an extension direction of the first dam portion of the third region.

[0017] In some embodiments, the end portion of the VSS includes a first edge close to one side of the first dam portion, the first dam structure includes a first portion, the orthographic projection of the first portion on the substrate covers the orthographic projection of the first edge on the substrate, and the extension direction of the first portion is parallel or approximately parallel to the extension direction of the first edge.

[0018] In some embodiments, the end portion of the VSS includes a second edge close to one side of the third region, the first dam structure includes a second portion, the orthographic projection of the second portion on the substrate covers the orthographic projection of the second edge on the substrate, and the extension direction of the second portion is parallel or approximately parallel to the extension direction of the second edge.

[0019] In some embodiments, a notch portion is provided on one side of the end portion of the VSS close to the third region, the first dam structure includes a third portion, the orthographic projection of the third portion on the substrate covers the orthographic projection of the third edge of the notch portion on the substrate, and an extension direction of the third portion is parallel or approximately parallel to an extension direction of the third edge.

[0020] In some embodiments, the notch portion includes a fourth edge and a fifth edge that are parallel or approximately parallel to the first dam portion, and the second dam structure includes a fourth portion extending along the extension direction of the fourth edge and / or a fifth portion extending along the extension direction of the fifth edge.

[0021] In some embodiments, the notch is rectangular.

[0022] In some embodiments, the width of the notch is 10-60 microns, and the length is 200-5000 microns.

[0023] In some embodiments, a height of the second dam portion in a direction perpendicular to the base substrate is less than or equal to a height of the first dam portion in a direction perpendicular to the base substrate.

[0024] In some embodiments, the display substrate includes a first flat layer, a second flat layer, a pixel defining layer, and a spacer stacked in sequence and located in the frame area;

[0025] The second dam portion is composed of the first planar layer, the second planar layer, and the pixel defining layer; or

[0026] The second dam portion is composed of the first planar layer, the second planar layer, the pixel defining layer, and the spacer.

[0027] In some embodiments, the maximum width of the first dam portion in a direction perpendicular to its own extension direction is 30-50 microns, and the maximum width of the second dam portion in a direction perpendicular to its own extension direction is 10-50 microns.

[0028] In some embodiments, the maximum width of the second dam portion in a direction perpendicular to its own extension direction is 15-30 microns.

[0029] In some embodiments, the length of the first dam structure is greater than 2000 microns.

[0030] An embodiment of the present disclosure further provides a display substrate, comprising:

[0031] a base substrate, the base substrate comprising a display area and a frame area surrounding the display area;

[0032] a first dam portion located in the frame area and surrounding the display area;

[0033] The frame area is provided with a low-voltage signal line, the frame area includes a first area and a second area where an end portion of the low-voltage signal line is located, the first area and the second area are symmetrical with respect to the display area, the frame area further includes a third area located between the first area and the second area, and the low-voltage signal line is not provided in the third area;

[0034] The second dam portion is located at least in the first area, the second area and / or the third area, and the second dam portion is located on a side of the first dam portion close to the display area.

[0035] In some embodiments, the maximum width of the second dam portion in a direction perpendicular to its own extension direction is smaller than the maximum width of the first dam portion in a direction perpendicular to its own extension direction; and / or

[0036] The length of the second dam portion in its own extending direction is smaller than the length of the first dam portion in its own extending direction.

[0037] An embodiment of the present disclosure further provides a display device including the display substrate described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] FIG1 is a top view of a display substrate;

[0039] FIG2 is a schematic diagram of water vapor intrusion into a display substrate in the related art;

[0040] FIG3 is a schematic diagram showing removal of a portion of the pixel defining layer;

[0041] 4 and 5 are schematic plan views of a display substrate according to an embodiment of the present disclosure;

[0042] Figures 6-7 and Figures 10-16 are partial enlarged schematic diagrams showing a substrate according to an embodiment of the present disclosure;

[0043] 8 and 9 are schematic cross-sectional views of FIG. 7 along the CC′ direction.

[0044] Reference Signs 01 Display Substrate 02 Display Area 03 Frame Area 04 First Area 06 Second Area 07 Third Area 011 VSS 012 Pixel Definition Layer 013 First Dam Portion 014 Water Vapor Intrusion Channel 015 Second Dam Portion 016 Base Substrate 017 First Flat Layer 018 Second Flat Layer 019 Spacer 020 Notch Portion 0201 Third Edge 0151 First Dam Structure 0152 Second Dam Structure 0111 First Edge 0112 Second Edge 01511 First Portion 01512 Second Portion 0201 Third Edge 02014 Fourth Edge 02015 Fifth Edge 01513 Third Portion 01524 Fourth Portion 01525 Fifth Portion DETAILED DESCRIPTION

[0045] In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present disclosure more clear, they will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0047] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms such as the third person singular form "comprises" and the present participle form "comprising" are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that a particular feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0048] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0049] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0050] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0051] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0052] As used herein, the term "if" is optionally interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined that" or "if [stated condition or event] is detected" are optionally interpreted to mean "upon determining" or "in response to determining" or "upon detecting [stated condition or event]" or "in response to detecting [stated condition or event]," depending on the context.

[0053] The use of "adapted to" or "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0054] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0055] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0056] Exemplary embodiments are described herein with reference to cross-sectional and / or plan views that are idealized exemplary figures.

[0057] In the accompanying drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the accompanying drawings due to, for example, manufacturing techniques and / or tolerances are contemplated. Therefore, the exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include deviations in shape due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the accompanying drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of a device and are not intended to limit the scope of the exemplary embodiments.

[0058] Currently, in the packaging process for OLED displays, the organic encapsulation material in the encapsulation structure is typically produced using inkjet printing (IJP). The ink used to produce the organic encapsulation structure is fluid, so preventing ink overflow is crucial to ensure IJP yield. In some embodiments, the display substrate includes a display area and a frame area. Within the frame area, two dam structures are positioned to enclose the display area, preventing ink overflow after IJP printing.

[0059] However, the inventors of the present disclosure have discovered that providing two circles of Dam in the frame area will increase the size of the frame area, which is not conducive to narrowing the frame of the display substrate.

[0060] Generally speaking, when the border distance (i.e., the width of the border area outside the display area) is greater than 700 microns, a two-circle Dam structure is used to better level the IJP. When the border distance is ≤700 microns, it can be called a narrow border, and generally only one circle of Dam is set in the border area. However, the ability of a single circle of Dam to prevent water vapor intrusion and overflow is worse than that of a two-circle Dam. During the REL (reliability evaluation) process, there is a higher risk of water vapor intrusion, resulting in display anomalies on the display substrate.

[0061] Figure 1 is a top view of a display substrate according to some embodiments. As shown in Figure 1 , display substrate 01 includes a display area 02 for displaying images and a frame area 03 for not displaying images. Frame area 03 surrounds at least one side of display area 02. In some examples, frame area 03 can enclose display area 02 and can be located outside of display area 02 in at least one direction.

[0062] The display substrate 01 may have a rectangular shape in a plan view, or may have a circular, elliptical, diamond, trapezoidal, square or other shapes according to display requirements.

[0063] The display substrate 01 described above can be applied to various display devices. For example, small and medium-sized electronic devices such as tablet computers, smart phones, head-mounted displays, car navigation units, cameras, center information displays (CIDs) provided in vehicles, watch-type electronic devices or other wearable devices, personal digital assistants (PDAs), portable multimedia players (PMPs), and game consoles, as well as medium and large electronic devices such as televisions, external billboards, monitors, home appliances including display screens, personal computers, and laptop computers. The electronic devices described above may represent simple examples for application of display devices, and therefore, those skilled in the art will recognize that the display substrate 01 may also be applied to other display devices without departing from the spirit and scope of the present disclosure.

[0064] As shown in Figure 1, a low-voltage signal line VSS 011 is provided in the border area 03. The low-voltage signal line VSS 011 extends from the first area 04 to the second area 06, that is, the end portion of the low-voltage signal line VSS 011 is located in the first area 04 and the second area 06. The first area 04 and the second area 06 belong to the border area 03, and the first area 04 and the second area 06 are symmetrical with respect to the display area 02; the border area 03 also includes a third area 07 located between the first area 04 and the second area 06, and the low-voltage signal line VSS 011 is not provided in the third area 07.

[0065] Figure 2 is an enlarged schematic diagram of the first region 04 in Figure 1. As shown in Figure 2, a first dam portion 013 is provided in the frame region 03, surrounding the display region 02. During the packaging of the display substrate, the first dam portion 013 prevents the ink used to make the organic packaging structure from overflowing. VSS 011 is typically made of Ag and ITO. After VSS 011 is formed, Ag particles are easily retained at the edge of VSS 011. To prevent Ag particles at the edge of VSS 011 from being washed into the display region 02 during the subsequent cleaning process, causing the risk of dark spots, the edge of VSS 011 is covered with a pixel defining layer 012. Pixel defining layer 012 is typically made of an organic insulating material. Under the high temperature and high humidity environment of package reliability testing, the organic insulating material easily absorbs moisture, forming a moisture intrusion channel 014 (shown as the dotted line in the figure) at the edge of VSS 011, reducing the packaging reliability of the display substrate.

[0066] In order to improve the packaging reliability of the display substrate, as shown in FIG3 , the pixel definition layer 012 at the location of the water vapor intrusion channel 014 in FIG2 can be removed. In this way, the water vapor intrusion channel 014 will not be formed. However, the VSS 011 at this location is not covered by the pixel definition layer 012. The edge of the VSS 011 is prone to form residual Ag particles, which can be easily washed into the display area 02 during the subsequent cleaning process, causing the risk of dark spots.

[0067] Embodiments of the present disclosure provide a display substrate and a display device, which can achieve a narrow frame of the display substrate while ensuring packaging performance.

[0068] An embodiment of the present disclosure provides a display substrate 01, as shown in FIG4 to FIG16 , including:

[0069] A base substrate, the base substrate comprising a display area 02 and a frame area 03 surrounding the display area 02;

[0070] a first dam portion 013 located in the frame area 03 and surrounding the display area 02;

[0071] The second dam portion 015 is located in the frame area 03, and the maximum width of the second dam portion 015 in the direction perpendicular to its own extension direction is smaller than the maximum width of the first dam portion 013 in the direction perpendicular to its own extension direction. The second dam portion 015 is located on the side of the first dam portion 013 close to the display area 02.

[0072] In this embodiment, in addition to the first dam portion 013, a second dam portion 015 is also provided. By providing a double-circle dam portion, the packaging reliability of the display substrate can be improved. In addition, the maximum width of the second dam portion 015 in a direction perpendicular to its own extension direction is smaller than the maximum width of the first dam portion 013 in a direction perpendicular to its own extension direction, which is conducive to achieving a narrow frame of the display substrate.

[0073] In addition, in order to further achieve a narrow frame of the display substrate, the minimum distance between the first dam portion 013 and the second dam portion 015 can be 10-20 microns, for example, it can be 10 microns, 11 microns, 12 microns, 13 microns, 14 microns, 15 microns, 16 microns, 17 microns, 18 microns, 19 microns or 20 microns.

[0074] In some embodiments, the first dam portion 013 surrounds at least one side of the display area 02. In some examples, the first dam portion 013 can enclose the display area 02; the second dam portion 015 surrounds at least one side of the display area 02. In some examples, the second dam portion 015 can enclose the display area 02, thereby maximizing the packaging reliability of the display substrate.

[0075] In order to further achieve a narrow frame of the display substrate, the second dam portion 015 may be provided only in the area where water vapor intrusion is likely to occur.

[0076] As shown in Figure 4 , a low-voltage signal line VSS 011 is provided in the border region 03. During package reliability testing, it was found that the areas where the end portion of VSS 011 is located (the first region 04 and the second region 06) are at a greater risk of moisture intrusion. To further achieve a narrow border on the display substrate, as shown in Figure 4 , a second dam portion 015 can be provided only in the first region 04 and the second region 06. The second dam portion 015 in the first region 04 and the second region 06 is defined as a first dam structure 0151. This embodiment uses the first region 04 as an example. The first dam structure 0151 in the second region 06 can be symmetrically arranged with the first dam structure 0151 in the first region 04 relative to the central axis of the display region in the Y direction. Of course, the first dam structure 0151 can also be provided only in the first region 04 or only in the second region 06. In the first region 04, A is the starting position of the first dam structure 0151, and B is the ending position of the first dam structure 0151.

[0077] During packaging reliability testing, it was discovered that the third region 07 between the first region 04 and the second region 06 also presents a relatively high risk of moisture intrusion. To ensure the packaging reliability of the display substrate, a second dam portion 015 can be provided in the third region 07, as shown in Figures 5 and 6. The second dam portion 015 in the third region 07 is defined as a second dam structure 0152. The second dam structure 0152 and the first dam structure 0151 together form the second dam portion 015. As shown in Figure 5, the second dam structure 0152 extends from the first region 04 through the third region 07 to the second region 06. Of course, the second dam structure 0152 can also be distributed intermittently in the third region 07, rather than extending continuously from the first region 04 through the third region 07 to the second region 06.

[0078] In order to achieve a narrow frame of the display substrate, the maximum width of the second dam portion 015 in the direction perpendicular to its own extension direction needs to be smaller than the maximum width of the first dam portion 013 in the direction perpendicular to its own extension direction. The longitudinal section of the second dam portion 015 in the direction perpendicular to its own extension direction can be rectangular, trapezoidal or semi-ellipsoidal, and the maximum width of the second dam portion 015 in the direction perpendicular to its own extension direction determines the area occupied by the second dam portion 015; the longitudinal section of the first dam portion 013 in the direction perpendicular to its own extension direction can be rectangular, trapezoidal or semi-ellipsoidal, and the maximum width of the first dam portion 013 in the direction perpendicular to its own extension direction determines the area occupied by the first dam portion 013.

[0079] In some embodiments, the maximum width of the first dam portion 013 perpendicular to its own extension direction can be 30-50 microns, such as 30 microns, 35 microns, 40 microns, 45 microns, or 50 microns; the maximum width of the second dam portion 015 perpendicular to its own extension direction can be 10-50 microns, such as 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, or 45 microns. Because the maximum width of the second dam portion 015 perpendicular to its own extension direction is smaller than the maximum width of the first dam portion 013 perpendicular to its own extension direction, the area occupied by the combination of the second dam portion 015 and the first dam portion 013 is smaller than the area occupied by the double-circle first dam portion 013, which helps to reduce the border of the display substrate.

[0080] In order to further reduce the border of the display substrate, in some embodiments, the maximum width of the second dam portion in the direction perpendicular to its own extension direction can be 15-30 microns, for example, 15 microns, 16 microns, 17 microns, 18 microns, 19 microns, 20 microns, 21 microns, 22 microns, 23 microns, 24 microns, 25 microns, 26 microns, 27 microns, 28 microns, 29 microns or 30 microns.

[0081] Since water vapor intrusion is likely to occur in the first area 04 and the second area 06, and the pixel defining layer of the display substrate is made of organic insulating material and is likely to absorb water vapor, the pixel defining layer of part of the first area 04 can be removed so that the orthographic projection of the pixel defining layer on the base substrate does not overlap with part of the first area 04; the pixel defining layer of part of the second area 06 can also be removed so that the orthographic projection of the pixel defining layer on the base substrate does not overlap with part of the second area 06; or, the pixel defining layer of part of the first area 04 and part of the second area 06 can be removed at the same time so that the orthographic projection of the pixel defining layer on the base substrate does not overlap with part of the first area 04 and part of the second area 06, thereby reducing the risk of water vapor intrusion.

[0082] In some embodiments, a pixel defining layer can be used to form a first dam structure 0151 in the first region 04 and the second region 06. This pixel defining layer not only serves as the first dam structure 0151, but also covers the edge of the VSS 011, preventing residual Ag particles at the edge of the VSS 011 from being washed into the display region 02 during subsequent cleaning processes. In this embodiment, the VSS 011 can be made of the same material as the anode in the display region and formed through a single patterning process. The pixel defining layer is formed after the anode, allowing the pixel defining layer to cover the edge of the VSS 011.

[0083] When the first dam structure 0151 is formed using a pixel defining layer, the first region 04 includes a first subregion where the first dam structure 0151 is located and a second subregion outside the first subregion, and the orthographic projection of the pixel defining layer on the substrate does not overlap with the second subregion, that is, the pixel defining layer in other regions outside the region where the first dam structure 0151 is located is removed; and / or,

[0084] The second area 06 includes a third sub-area where the first dam structure 0151 is located and a fourth sub-area outside the third sub-area. The positive projection of the pixel defining layer on the base substrate does not overlap with the fourth sub-area, that is, the pixel defining layer in other areas outside the area where the first dam structure 0151 is located is removed.

[0085] In one specific embodiment, as shown in Figures 6 and 7 , the second dam portion 015 includes a first dam structure 0151 located in the first region 04 and a second dam structure 0152 located in the third region 07. In the first region 04, the end portion of the VSS 011 includes a first edge 0111 adjacent to the first dam portion 013. The first dam structure 0151 includes a first portion 01511 (the portion within the first dashed box from left to right in Figure 6 ). To prevent Ag particles from being washed into the display region 02 during subsequent cleaning processes, the orthographic projection of the first portion 01511 on the base substrate overlaps the orthographic projection of the first edge 0111 on the base substrate. This allows the first portion 01511 to cover the first edge 0111, preventing any residual Ag particles from being washed into the display region 02 during subsequent cleaning processes. The extension direction of the first part 01511 can be parallel or approximately parallel to the extension direction of the first edge 0111; the end part of the VSS 011 includes a second edge 0112 close to the side of the third area 07, and the first dam structure 0151 includes a second part 01512 (the part in the second dotted box from left to right in Figure 6). In order to prevent the Ag particles of the second edge 0112 from being washed to the display area 02 in the subsequent cleaning process, the orthographic projection of the second part 01512 on the base substrate covers the orthographic projection of the second edge 0112 on the base substrate, so that the second part 01512 can cover the second edge 0112, and prevent the Ag particles remaining on the second edge 01120111 from being washed to the display area 02 in the subsequent cleaning process; the extension direction of the second part 01512 can be parallel or approximately parallel to the extension direction of the second edge 0112.

[0086] As shown in Figure 7, after adopting the above structure, a water vapor intrusion channel 014 (dashed line with arrow) as shown in the figure can be obtained. By adjusting the starting position and the ending position of the first dam structure 0151, for example, the length of the first dam structure 0151 can be designed to be greater than 2000 microns, specifically 2100 microns, 2200 microns, 2300 microns, 2400 microns, 2500 microns, 2600 microns or 2700 microns. In this way, the length of the water vapor intrusion channel 014 can be greater than 2000 microns, which greatly extends the path of water vapor intrusion, can reduce the risk of water vapor intrusion in the REL process, and ensure the packaging reliability of the display substrate.

[0087] In order to further ensure the packaging reliability of the display substrate, as shown in Figures 6 and 7, a second dam structure 0152 can be provided in the third area 07, and the extension direction of the second dam structure 0152 can be parallel or approximately parallel to the extension direction of the first dam portion 013 of the third area 07.

[0088] 8 and 9 are schematic cross-sectional views taken along the CC' direction in FIG. 7 . As shown in FIG. 8 and FIG. 9 , the display substrate includes a base substrate 016 , a first flat layer 017 , a second flat layer 018 , a pixel defining layer 012 , and a spacer 019 , which are stacked sequentially in the frame region.

[0089] As shown in FIG. 8 , in the Z direction, the second dam portion 015 may be composed of the first planar layer 017 , the second planar layer 018 and the pixel defining layer 012 ; or

[0090] As shown in FIG. 9 , in the Z direction, the second dam portion 015 may be composed of the first planar layer 017 , the second planar layer 018 , the pixel defining layer 012 , and the spacer 019 .

[0091] Of course, the second dam portion 015 may also be composed of the first flat layer 017 , the pixel defining layer 012 and the spacer 019 ; or, the second dam portion 015 may be composed of the second flat layer 018 , the pixel defining layer 012 and the spacer 019 .

[0092] That is, the second dam portion 015 can be composed of at least one of the first planar layer 017, the second planar layer 018, the pixel defining layer 012, and the spacer 019. In the first region 04 and the second region 06, due to the presence of the VSS 011, to prevent Ag particles remaining at the edge of the VSS 011 from being washed into the display region 02 during the subsequent cleaning process, the first dam structure 0151 is preferably composed of at least the pixel defining layer 012. This allows the pixel defining layer 012 to both form the first dam structure 0151 and cover the edge of the VSS 011, preventing Ag particles remaining at the edge of the VSS 011 from being washed into the display region 02 during the subsequent cleaning process. The second dam structure 0152 in the third region 07 may or may not include the pixel defining layer 012.

[0093] In addition, to ensure the flatness of the display substrate, the first dam structure 0151 and the second dam structure 0152 preferably employ the same film structure, and the film structures have equal or approximately equal thicknesses. For example, if the first dam structure 0151 is composed of the first planarizing layer 017, the second planarizing layer 018, and the pixel defining layer 012, then the second dam structure 0152 is also composed of the first planarizing layer 017, the second planarizing layer 018, and the pixel defining layer 012. Furthermore, the thickness of the first planarizing layer 017 constituting the first dam structure 0151 is equal to or approximately equal to the thickness of the first planarizing layer 017 constituting the second dam structure 0152; the thickness of the second planarizing layer 018 constituting the first dam structure 0151 is equal to or approximately equal to the thickness of the second planarizing layer 018 constituting the second dam structure 0152; and the thickness of the pixel defining layer 012 constituting the first dam structure 0151 is equal to or approximately equal to the thickness of the pixel defining layer 012 constituting the second dam structure 0152. For another example, the first dam structure 0151 is composed of the first flat layer 017, the second flat layer 018, the pixel defining layer 012, and the spacer 019, and the second dam structure 0152 is also composed of the first flat layer 017, the second flat layer 018, the pixel defining layer 012, and the spacer 019, and the thickness of the first flat layer 017 constituting the first dam structure 0151 is equal to or substantially equal to the thickness of the first flat layer 017 constituting the second dam structure 0152. equal; the thickness of the second flat layer 018 constituting the first dam structure 0151 is equal to or approximately equal to the thickness of the second flat layer 018 constituting the second dam structure 0152; the thickness of the pixel defining layer 012 constituting the first dam structure 0151 is equal to or approximately equal to the thickness of the pixel defining layer 012 constituting the second dam structure 0152; the thickness of the spacer 019 constituting the first dam structure 0151 is equal to or approximately equal to the thickness of the spacer 019 constituting the second dam structure 0152.

[0094] In another specific embodiment, as shown in FIG10 , the second dam portion 015 includes a first dam structure 0151 located in the first region 04. In the first region 04, the end portion of the VSS 011 includes a first edge 0111 adjacent to the first dam portion 013. The first dam structure 0151 includes a first portion 01511 (the portion within the first dotted box from left to right in the figure). To prevent Ag particles from being washed into the display region 02 during a subsequent cleaning process, the orthographic projection of the first portion 01511 on the base substrate overlaps the orthographic projection of the first edge 0111 on the base substrate. Thus, the first portion 01511 can cover the first edge 0111, preventing any residual Ag particles from being washed into the display region 02 during a subsequent cleaning process. The first portion 01511 can extend in a direction parallel or substantially parallel to the direction of the first edge 0111. The end portion of the VSS 011 includes a second edge 0112 close to the side of the third area 07, and the first dam structure 0151 includes a second portion 01512 (the portion within the second dotted box from left to right in the figure). In order to prevent the Ag particles of the second edge 0112 from being washed to the display area 02 in the subsequent cleaning process, the orthographic projection of the second portion 01512 on the base substrate covers the orthographic projection of the second edge 0112 on the base substrate, so that the second portion 01512 can cover the second edge 0112 and prevent the Ag particles remaining in the second edge 0112 from being washed to the display area 02 in the subsequent cleaning process; the extension direction of the second portion 01512 can be parallel or approximately parallel to the extension direction of the second edge 0112.

[0095] As shown in Figure 10, after adopting the above structure, a water vapor intrusion channel 014 (dashed line with arrow) as shown in the figure can be obtained. By adjusting the starting position and the ending position of the first dam structure 0151, for example, the length of the first dam structure 0151 can be designed to be greater than 2000 microns, specifically 2100 microns, 2200 microns, 2300 microns, 2400 microns, 2500 microns, 2600 microns or 2700 microns. In this way, the length of the water vapor intrusion channel 014 can be greater than 2000 microns, which greatly extends the path of water vapor intrusion, can reduce the risk of water vapor intrusion in the REL process, and ensure the packaging reliability of the display substrate.

[0096] In this embodiment, the second dam structure 0152 is not provided in the third region 07 . Thus, there is no need to retain the pixel defining layer 012 in the third region 07 to form the second dam structure 0152 , thereby reducing the risk of water vapor intrusion into the third region 07 . In addition, it is beneficial to reduce the border width of the third region 07 .

[0097] In this embodiment, the structure of the first dam structure 0151 may refer to the structures shown in FIG8 and FIG9 , and will not be described in detail here.

[0098] In another specific embodiment, as shown in FIG11 , the second dam portion 015 includes a first dam structure 0151 located in the first region 04. In the first region 04, the end portion of the VSS 011 includes a first edge 0111 adjacent to the first dam portion 013. The first dam structure 0151 includes a first portion 01511 (the portion within the dashed box in the figure). To prevent Ag particles at the first edge 0111 from being washed into the display region 02 during a subsequent cleaning process, the orthographic projection of the first portion 01511 on the base substrate overlaps the orthographic projection of the first edge 0111 on the base substrate. Thus, the first portion 01511 can cover the first edge 0111, preventing any residual Ag particles at the first edge 0111 from being washed into the display region 02 during a subsequent cleaning process. The first portion 01511 can extend in a direction parallel or substantially parallel to the direction of the first edge 0111.

[0099] In order to further ensure the packaging reliability of the display substrate, as shown in Figure 11, a second dam structure 0152 can also be set in the third area 07. The extension direction of the second dam structure 0152 can be parallel or approximately parallel to the extension direction of the first dam portion 013 of the third area 07.

[0100] As shown in Figure 11, after adopting the above structure, a water vapor intrusion channel 014 (dashed line with an arrow) as shown in the figure can be obtained. The length of the water vapor intrusion channel 014 is roughly equal to the sum of the lengths of the first dam structure 0151 and the second dam structure 0152. By adjusting the starting position and the end position of the first dam structure 0151 and the second dam structure 0152, the length of the water vapor intrusion channel 014 can be made greater than 2000 microns, which greatly extends the path of water vapor intrusion, can reduce the risk of water vapor intrusion in the REL process, and ensure the packaging reliability of the display substrate.

[0101] In this embodiment, the structures of the first dam structure 0151 and the second dam structure 0152 can refer to the structures shown in Figures 8 and 9, and will not be repeated here.

[0102] In some embodiments, as shown in FIG12 , a notch 020 (the portion within the smallest dashed box in the figure) is provided at the end portion of the VSS 011 near the third region 07. The edge of the notch 020 is a third edge 0201. In some embodiments, the notch 020 may be rectangular. As shown in FIG12 , the width of the notch 020 is D and the length is L. Of course, the notch 020 is not limited to a rectangle and may also be a circle, an ellipse, a diamond, a trapezoid, a square, or other shapes as required by the display.

[0103] In this embodiment, the notch portion 020 is described as a rectangle.

[0104] In a specific embodiment, as shown in Figures 12 and 13, the first dam structure 0151 includes a third part 01513 (the part in the first dotted box from left to right in Figure 13). In order to prevent the Ag particles remaining on the third edge 0201 from being washed into the display area 02 during the subsequent cleaning process, the orthographic projection of the third part 01513 on the base substrate covers the orthographic projection of the third edge 0201 of the notch on the base substrate. In this way, the third part 01513 can cover the third edge 0201 and prevent the Ag particles remaining on the third edge 0201 from being washed into the display area 02 during the subsequent cleaning process; the extension direction of the third part 01513 can be parallel or approximately parallel to the extension direction of the third edge 0201.

[0105] As shown in Figure 13, the notch portion 020 includes a fifth edge 02015 that is parallel or approximately parallel to the first dam portion 013. The fifth edge 02015 is a part of the third edge 0201. The second dam structure 0152 includes a fifth portion 01525 (the portion within the second dotted box from left to right in Figure 13) extending along the extension direction of the fifth edge 02015. During the packaging process of the display substrate, the fifth portion 01525 can prevent ink from overflowing, thereby ensuring the reliability of the display substrate packaging.

[0106] As shown in FIG13 , after adopting the above structure, a water vapor intrusion channel 014 (dashed line with an arrow) as shown in the figure can be obtained. By adjusting the size of the notch 020, the length of the water vapor intrusion channel 014 can be made greater than 2000 microns, which greatly extends the path of water vapor intrusion, can reduce the risk of water vapor intrusion during the REL process, and ensure the packaging reliability of the display substrate.

[0107] In some embodiments, the width D of the notch may be 10-60 microns, and the length L may be 200-5000 microns. Specifically, the width D of the notch may be 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, 55 microns, or 60 microns. The length L of the notch may be 200 microns, 500 microns, 1000 microns, 2000 microns, 3000 microns, 4000 microns, 4500 microns, or 5000 microns.

[0108] In this embodiment, the structures of the third part 01513 and the fifth part 01525 can refer to the structures shown in Figures 8 and 9, and will not be repeated here.

[0109] In another specific embodiment, as shown in Figures 12 and 14, the first dam structure 0151 includes a third part 01513 (the part in the first dotted box from left to right in Figure 14). In order to prevent the Ag particles remaining on the third edge 0201 from being washed into the display area 02 during the subsequent cleaning process, the orthographic projection of the third part 01513 on the base substrate covers the orthographic projection of the third edge 0201 of the notch on the base substrate. In this way, the third part 01513 can cover the third edge 0201 and prevent the Ag particles remaining on the third edge 0201 from being washed into the display area 02 during the subsequent cleaning process; the extension direction of the third part 01513 can be parallel or approximately parallel to the extension direction of the third edge 0201.

[0110] As shown in Figure 14, the notch portion 020 includes a fifth edge 02015 and a fourth edge 02014 that are parallel or approximately parallel to the first dam portion 013. The fifth edge 02015 and the fourth edge 02014 are both part of the third edge 0201. The second dam structure 0152 includes a fifth portion 01525 (the portion in the lower right dotted box in Figure 14) extending along the extension direction of the fifth edge 02015 and a fourth portion 01524 (the portion in the upper right dotted box in Figure 14) extending along the extension direction of the fourth edge 02014. During the packaging process of the display substrate, the fifth portion 01525 and the fourth portion 01524 can effectively prevent ink from overflowing, thereby ensuring the reliability of the display substrate packaging.

[0111] As shown in FIG14 , after adopting the above structure, a water vapor intrusion channel 014 (dashed line with an arrow) as shown in the figure can be obtained. By adjusting the size of the notch 020, the length of the water vapor intrusion channel 014 can be made greater than 2000 microns, which greatly extends the path of water vapor intrusion, can reduce the risk of water vapor intrusion during the REL process, and ensure the packaging reliability of the display substrate.

[0112] In some embodiments, the width D of the notch may be 10-60 microns, and the length L may be 200-5000 microns. Specifically, the width D of the notch may be 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, 55 microns, or 60 microns. The length L of the notch may be 200 microns, 500 microns, 1000 microns, 2000 microns, 3000 microns, 4000 microns, 4500 microns, or 5000 microns.

[0113] In this embodiment, the structures of the third part 01513, the fifth part 01525 and the fourth part 01524 can refer to the structures shown in Figures 8 and 9, and will not be repeated here.

[0114] In another specific embodiment, as shown in Figures 12 and 15, the first dam structure 0151 includes a third part 01513 (the part in the first dotted box from left to right in Figure 15). In order to prevent the Ag particles of the third edge 0201 from being washed to the display area 02 in the subsequent cleaning process, the orthographic projection of the third part 01513 on the base substrate covers the orthographic projection of the third edge 0201 of the notch on the base substrate. In this way, the third part 01513 can cover the third edge 0201 and prevent the Ag particles remaining in the third edge 0201 from being washed to the display area 02 in the subsequent cleaning process; the extension direction of the third part 01513 can be parallel or approximately parallel to the extension direction of the third edge 0201.

[0115] As shown in Figure 15, the notch portion 020 includes a fourth edge 02014 that is parallel or approximately parallel to the first dam portion 013. The fourth edge 02014 is a part of the third edge 0201. The second dam structure 0152 includes a fourth portion 01524 (the portion within the second dotted box from left to right in Figure 15) extending along the extension direction of the fourth edge 02014. During the packaging process of the display substrate, the fourth portion 01524 can prevent ink from overflowing, thereby ensuring the reliability of the display substrate packaging.

[0116] As shown in FIG15 , after adopting the above structure, a water vapor intrusion channel 014 (dashed line with an arrow) as shown in the figure can be obtained. By adjusting the size of the notch 020, the length of the water vapor intrusion channel 014 can be made greater than 2000 microns, which greatly extends the path of water vapor intrusion, can reduce the risk of water vapor intrusion during the REL process, and ensure the packaging reliability of the display substrate.

[0117] In some embodiments, the width D of the notch may be 10-60 microns, and the length L may be 200-5000 microns. Specifically, the width D of the notch may be 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, 55 microns, or 60 microns. The length L of the notch may be 200 microns, 500 microns, 1000 microns, 2000 microns, 3000 microns, 4000 microns, 4500 microns, or 5000 microns.

[0118] In this embodiment, the structures of the third part 01513 and the fourth part 01524 may refer to the structures shown in FIG8 and FIG9 , and will not be described in detail here.

[0119] In another specific embodiment, as shown in Figures 12 and 16, the first dam structure 0151 includes a third part 01513 (the part in the dotted box in Figure 16). In order to prevent the Ag particles remaining on the third edge 0201 from being washed into the display area 02 during the subsequent cleaning process, the orthographic projection of the third part 01513 on the base substrate covers the orthographic projection of the third edge 0201 of the notch on the base substrate. In this way, the third part 01513 can cover the third edge 0201 and prevent the Ag particles remaining on the third edge 0201 from being washed into the display area 02 during the subsequent cleaning process; the extension direction of the third part 01513 can be parallel or approximately parallel to the extension direction of the third edge 0201.

[0120] As shown in FIG16 , after adopting the above structure, a water vapor intrusion channel 014 (dashed line with an arrow) as shown in the figure can be obtained. By adjusting the size of the notch 020, the length of the water vapor intrusion channel 014 can be made greater than 2000 microns, which greatly extends the path of water vapor intrusion, can reduce the risk of water vapor intrusion during the REL process, and ensure the packaging reliability of the display substrate.

[0121] In some embodiments, the width D of the notch may be 10-60 microns, and the length L may be 200-5000 microns. Specifically, the width D of the notch may be 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, 40 microns, 45 microns, 50 microns, 55 microns, or 60 microns. The length L of the notch may be 200 microns, 500 microns, 1000 microns, 2000 microns, 3000 microns, 4000 microns, 4500 microns, or 5000 microns.

[0122] In this embodiment, the second dam structure 0152 is not provided in the third region 07 . Thus, there is no need to retain the pixel defining layer 012 in the third region 07 to form the second dam structure 0152 , thereby reducing the risk of water vapor intrusion into the third region 07 . In addition, it is beneficial to reduce the border width of the third region 07 .

[0123] In this embodiment, the structure of the third part 01513 can refer to the structures shown in Figures 8 and 9, and will not be repeated here.

[0124] In this embodiment, the height of the second dam portion 015 in the direction perpendicular to the base substrate can be less than or equal to the height of the first dam portion 013 in the direction perpendicular to the base substrate. In this way, the first dam portion 013 and the second dam portion 015 can form a stepped structure, which can effectively prevent ink from overflowing when the display substrate is packaged, ensuring that the ink will not exceed the first dam portion during the IJP process, thereby improving the packaging reliability of the display substrate.

[0125] In summary, the display substrate provided by the embodiment of the present disclosure, by providing the second dam portion 015 , can improve the ability of the display substrate to block ink overflowing from the display area while shortening the display substrate frame size, thereby improving the IJP manufacturing yield.

[0126] An embodiment of the present disclosure further provides a display substrate, as shown in FIG4 , comprising:

[0127] A base substrate, the base substrate comprising a display area 02 and a frame area 03 surrounding the display area 02;

[0128] a first dam portion located in the frame area 03 and surrounding the display area 02;

[0129] The frame area 03 is provided with a low-voltage signal line 011. The frame area 03 includes a first area 04 and a second area 06 where the end portion of the low-voltage signal line 011 is located. The first area 04 and the second area 06 are symmetrical with respect to the display area 02. The frame area 03 also includes a third area 07 located between the first area 04 and the second area 06. The low-voltage signal line 011 is not provided in the third area 07.

[0130] The second dam portion is located at least in the first area 04 , the second area 06 and / or the third area 07 , and the second dam portion is located on a side of the first dam portion close to the display area.

[0131] As shown in FIG4 , a low-voltage signal line VSS 011 is provided in the frame area 03. During the packaging reliability test, it was found that the area where the end portion of VSS 011 is located (the first area 04 and the second area 06) has a high risk of water vapor intrusion, and the third area 07 between the first area 04 and the second area 06 also has a high risk of water vapor intrusion. To ensure the packaging reliability of the display substrate, a second dam portion may be provided in the first area, or in the second area, or in the first and second areas, or in the first, second, and third areas.

[0132] In order to achieve a narrow frame of the display substrate, the maximum width of the second dam portion in the direction perpendicular to its own extension direction needs to be smaller than the maximum width of the first dam portion in the direction perpendicular to its own extension direction. The longitudinal cross-section of the second dam portion in the direction perpendicular to its own extension direction can be rectangular, trapezoidal or semi-ellipsoidal, and the maximum width of the second dam portion in the direction perpendicular to its own extension direction determines the area occupied by the second dam portion; the longitudinal cross-section of the first dam portion in the direction perpendicular to its own extension direction can be rectangular, trapezoidal or semi-ellipsoidal, and the maximum width of the first dam portion in the direction perpendicular to its own extension direction determines the area occupied by the first dam portion.

[0133] In some embodiments, the maximum width of the first dam portion in the direction perpendicular to its own extension can be 30-50 microns, such as 30 microns, 35 microns, 40 microns, 45 microns, or 50 microns; the maximum width of the second dam portion in the direction perpendicular to its own extension can be 10-50 microns, such as 10 microns, 15 microns, 20 microns, 25 microns, 30 microns, 35 microns, or 45 microns. Because the maximum width of the second dam portion in the direction perpendicular to its own extension is smaller than the maximum width of the first dam portion in the direction perpendicular to its own extension, the area occupied by the combination of the second dam portion and the first dam portion is smaller than the area occupied by the double-circle first dam portion, which helps to reduce the bezel of the display substrate.

[0134] In order to further reduce the border of the display substrate, in some embodiments, the maximum width of the second dam portion in the direction perpendicular to its own extension direction can be 15-30 microns, for example, 15 microns, 16 microns, 17 microns, 18 microns, 19 microns, 20 microns, 21 microns, 22 microns, 23 microns, 24 microns, 25 microns, 26 microns, 27 microns, 28 microns, 29 microns or 30 microns.

[0135] In some embodiments, the length of the second dam portion in its own extension direction is smaller than the length of the first dam portion in its own extension direction. Because the risk of water vapor intrusion in other areas of the frame area except the first area, the second area and the third area is relatively small, the second dam portion may not be set in other areas. In this way, only the first dam portion needs to be set in other areas, which is conducive to achieving a narrow frame of the display substrate.

[0136] An embodiment of the present disclosure further provides a display device including the display substrate described above.

[0137] The display device includes, but is not limited to, components such as a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. Those skilled in the art will appreciate that the structure of the above-mentioned display device does not constitute a limitation on the display device, and the display device may include more or fewer of the above-mentioned components, or a combination of certain components, or a different arrangement of components. In the embodiments of the present disclosure, the display device includes, but is not limited to, a monitor, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, and the like.

[0138] The display device can be any product or component with a display function, such as an LCD TV, an LCD monitor, a digital photo frame, a mobile phone, or a tablet computer. The display device further includes a flexible circuit board, a printed circuit board, and a backplane.

[0139] Accordingly, an embodiment of the present disclosure further provides a method for manufacturing a display substrate, as shown in FIG8 , comprising:

[0140] Step 1: Provide a substrate 016;

[0141] Step 2: forming a pattern of a first planar layer 017 on the base substrate 016;

[0142] Step 3: forming a pattern of a second flat layer 018 on the first flat layer 017;

[0143] Step 4: forming a pattern of the pixel definition layer 012 on the second planar layer 018 .

[0144] The pattern of the first flat layer 017 can be located in the first area 04, the second area 06 and / or the third area 07; the pattern of the second flat layer 018 can be located in the first area 04, the second area 06 and / or the third area 07; the pattern of the pixel defining layer 012 can be located in the first area 04, the second area 06 and / or the third area 07.

[0145] When the pattern of the first flat layer 017 is located in the first area 04 and / or the second area 06, the pattern of the first flat layer 017 can constitute a part of the first dam structure 0151 as shown in Figures 6-7, 10-11, and 13-16; when the pattern of the first flat layer 017 is located in the third area 07, the pattern of the first flat layer 017 can constitute a part of the second dam structure 0152 as shown in Figures 6-7, 11, and 13-15.

[0146] When the pattern of the second flat layer 018 is located in the first area 04 and / or the second area 06, the pattern of the second flat layer 018 can constitute a part of the first dam structure 0151 as shown in Figures 6-7, 10-11, and 13-16; when the pattern of the second flat layer 018 is located in the third area 07, the pattern of the second flat layer 018 can constitute a part of the second dam structure 0152 as shown in Figures 6-7, 11, and 13-15.

[0147] When the pattern of the pixel defining layer 012 is located in the first area 04 and / or the second area 06, the pattern of the pixel defining layer 012 can constitute a part of the first dam structure 0151 as shown in Figures 6-7, 10-11, and 13-16; when the pattern of the pixel defining layer 012 is located in the third area 07, the pattern of the pixel defining layer 012 can constitute a part of the second dam structure 0152 as shown in Figures 6-7, 11, and 13-15.

[0148] The present disclosure also provides a method for manufacturing a display substrate, as shown in FIG9 , including:

[0149] Step 1: Provide a substrate 016;

[0150] Step 2: forming a pattern of a first planar layer 017 on the base substrate 016;

[0151] Step 3: forming a pattern of a second flat layer 018 on the first flat layer 017;

[0152] Step 4: forming a pattern of a pixel definition layer 012 on the second planar layer 018;

[0153] Step 5: Forming a pattern of spacers 019 on the pixel definition layer 012 .

[0154] The pattern of the first flat layer 017 can be located in the first area 04, the second area 06 and / or the third area 07; the pattern of the second flat layer 018 can be located in the first area 04, the second area 06 and / or the third area 07; the pattern of the pixel defining layer 012 can be located in the first area 04, the second area 06 and / or the third area 07; the pattern of the spacer 019 can be located in the first area 04, the second area 06 and / or the third area 07.

[0155] When the pattern of the first flat layer 017 is located in the first area 04 and / or the second area 06, the pattern of the first flat layer 017 can constitute a part of the first dam structure 0151 as shown in Figures 6-7, 10-11, and 13-16; when the pattern of the first flat layer 017 is located in the third area 07, the pattern of the first flat layer 017 can constitute a part of the second dam structure 0152 as shown in Figures 6-7, 11, and 13-15.

[0156] When the pattern of the second flat layer 018 is located in the first area 04 and / or the second area 06, the pattern of the second flat layer 018 can constitute a part of the first dam structure 0151 as shown in Figures 6-7, 10-11, and 13-16; when the pattern of the second flat layer 018 is located in the third area 07, the pattern of the second flat layer 018 can constitute a part of the second dam structure 0152 as shown in Figures 6-7, 11, and 13-15.

[0157] When the pattern of the pixel defining layer 012 is located in the first area 04 and / or the second area 06, the pattern of the pixel defining layer 012 can constitute a part of the first dam structure 0151 as shown in Figures 6-7, 10-11, and 13-16; when the pattern of the pixel defining layer 012 is located in the third area 07, the pattern of the pixel defining layer 012 can constitute a part of the second dam structure 0152 as shown in Figures 6-7, 11, and 13-15.

[0158] When the pattern of the spacer 019 is located in the first area 04 and / or the second area 06, the pattern of the spacer 019 can constitute a part of the first dam structure 0151 as shown in Figures 6-7, 10-11, and 13-16; when the pattern of the spacer 019 is located in the third area 07, the pattern of the spacer 019 can constitute a part of the second dam structure 0152 as shown in Figures 6-7, 11, and 13-15.

[0159] In summary, the manufacturing method of the display substrate provided in the embodiment of the present disclosure can produce a second dam portion 015 on at least one side of the display area, and can improve the display substrate's ability to block ink overflowing from the display area on the basis of reducing the size of the display substrate frame, thereby improving the manufacturing yield of the display substrate.

[0160] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A display substrate, characterized in that: include: A base substrate, the base substrate comprising a display area and a frame area surrounding the display area; A first dam portion located in the frame area and surrounding the display area; A second dam portion is located in the frame area, wherein the maximum width of the second dam portion in a direction perpendicular to its own extension direction is smaller than the maximum width of the first dam portion in a direction perpendicular to its own extension direction, and the second dam portion is located on a side of the first dam portion close to the display area.

2. The display substrate according to claim 1, characterized in that: A low-voltage signal line is arranged in the border area, and the border area includes a first area and a second area where the end parts of the low-voltage signal line are located, the first area and the second area are symmetrical with respect to the display area, and the second dam portion includes a first dam structure arranged in the first area and / or the second area.

3. The display substrate according to claim 2, characterized in that: The frame region further includes a third region located between the first region and the second region, and the second dam portion further includes a second dam structure extending from the first region through the third region to the second region.

4. The display substrate according to claim 2, characterized in that: The display substrate comprises a pixel defining layer, and an orthographic projection of the pixel defining layer on the base substrate does not overlap with a partial area of ​​the first area; and / or The orthographic projection of the pixel defining layer on the base substrate does not overlap with a portion of the second region.

5. The display substrate according to claim 4, characterized in that: The first region includes a first sub-region where the first dam structure is located and a second sub-region outside the first sub-region, and the orthographic projection of the pixel defining layer on the base substrate does not overlap with the second sub-region; and / or The second region includes a third sub-region where the first dam structure is located and a fourth sub-region outside the third sub-region, and the orthographic projection of the pixel defining layer on the base substrate does not overlap with the fourth sub-region.

6. The display substrate according to claim 3, characterized in that: An extending direction of the second dam structure is parallel or substantially parallel to an extending direction of the first dam portion of the third region.

7. The display substrate according to claim 3, characterized in that: The end portion of the low-voltage signal line includes a first edge close to one side of the first dam portion, the first dam structure includes a first part, the orthographic projection of the first part on the substrate covers the orthographic projection of the first edge on the substrate, and the extension direction of the first part is parallel or approximately parallel to the extension direction of the first edge.

8. The display substrate according to claim 3 or 7, characterized in that: The end portion of the low-voltage signal line includes a second edge close to one side of the third region, the first dam structure includes a second portion, the orthographic projection of the second portion on the substrate covers the orthographic projection of the second edge on the substrate, and an extension direction of the second portion is parallel or approximately parallel to an extension direction of the second edge.

9. The display substrate according to claim 3, characterized in that: A notch portion is provided at one side of the end portion of the low-voltage signal line close to the third area, and the first dam structure includes a third part, the orthographic projection of the third part on the substrate covers the orthographic projection of the third edge of the notch portion on the substrate, and the extension direction of the third part is parallel or approximately parallel to the extension direction of the third edge.

10. The display substrate according to claim 9, characterized in that: The notch portion includes a fourth edge and a fifth edge that are parallel or substantially parallel to the first dam portion, and the second dam structure includes a fourth portion extending along an extension direction of the fourth edge and / or a fifth portion extending along an extension direction of the fifth edge.

11. The display substrate according to claim 9, characterized in that: The notch is rectangular.

12. The display substrate according to claim 11, characterized in that: The width of the notch is 10-60 microns, and the length is 200-5000 microns.

13. The display substrate according to claim 1, characterized in that: A height of the second dam portion in a direction perpendicular to the base substrate is less than or equal to a height of the first dam portion in a direction perpendicular to the base substrate.

14. The display substrate according to claim 1, characterized in that: The display substrate includes a first flat layer, a second flat layer, a pixel defining layer and a spacer which are stacked in sequence and located in the frame area; The second dam portion is composed of the first planar layer, the second planar layer and the pixel defining layer; or The second dam portion is composed of the first planar layer, the second planar layer, the pixel defining layer, and the spacer.

15. The display substrate according to claim 1, characterized in that: The maximum width of the first dam portion in a direction perpendicular to its own extension direction is 30-50 micrometers, and the maximum width of the second dam portion in a direction perpendicular to its own extension direction is 10-50 micrometers.

16. The display substrate according to claim 15, characterized in that: The maximum width of the second dam portion in a direction perpendicular to its own extending direction is 15-30 micrometers.

17. The display substrate according to claim 1, characterized in that: The length of the first dam structure is greater than 2000 micrometers.

18. A display substrate, characterized in that: include: A base substrate, the base substrate comprising a display area and a frame area surrounding the display area; A first dam portion located in the frame area and surrounding the display area; The frame area is provided with a low-voltage signal line, the frame area includes a first area and a second area where the end portion of the low-voltage signal line is located, the first area and the second area are symmetrical with respect to the display area, the frame area also includes a third area located between the first area and the second area, and the third area is not provided with the low-voltage signal line; The second dam portion is at least located in the first area, the second area and / or the third area, and the second dam portion is located on a side of the first dam portion close to the display area.

19. The display substrate according to claim 18, characterized in that: The maximum width of the second dam portion in a direction perpendicular to its own extension direction is smaller than the maximum width of the first dam portion in a direction perpendicular to its own extension direction; and / or The length of the second dam portion in its extending direction is smaller than the length of the first dam portion in its extending direction.

20. A display device, characterized in that: The display substrate comprises the display substrate according to any one of claims 1 to 17 or the display substrate according to any one of claims 18 to 19.

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