Display substrate and preparation method therefor, and display panel

Abstract

A display substrate and a preparation method therefor, and a display panel. The display substrate has a display area (100) and an edge area (101). The edge area (101) surrounds the periphery of the display area (100), and the edge area (101) comprises a plurality of side positions. The display substrate comprises a base (1); and a retaining wall (2) is located on a side of the base (1) and is located at at least some of the side positions of the edge area (101). According to the described display substrate, by means of the provision of the retaining wall (2), in one aspect, the material of an alignment film (4) can be prevented from expanding during a preparation process to a region in which a sealant (3) is provided, thereby avoiding the problems in subsequent processing of the impact on fine detection of the sealant, on the conduction performance of a conductive circuit in the display substrate, and on peeling of the sealant (3). In another aspect, the sealant (3) can be prevented from overflowing in subsequent preparation processes to a region in which the alignment film (4) is located, thereby preventing the overflow of the sealant (3) from affecting the alignment of the alignment film (4). In yet another aspect, external water vapor can be prevented from entering the display substrate, thereby preventing corrosion of metal lines caused by water vapor.

Description

Display substrate, its preparation method, and display panel Technical Field

[0001] This disclosure pertains to the field of display technology, specifically relating to a display substrate, its fabrication method, and a display panel. Background Technology

[0002] LCD (Liquid Crystal Display) has attracted widespread attention due to its advantages such as high display quality, no electromagnetic radiation, large viewable area, small size, light weight, good picture quality, wide range of applications, low voltage, low power consumption, and long lifespan. Summary of the Invention

[0003] In a first aspect, embodiments of this disclosure provide a display substrate having a display area and an edge area, the edge area surrounding the periphery of the display area, wherein the edge area includes a plurality of side positions;

[0004] The display substrate includes a substrate;

[0005] A retaining wall is located on one side of the base and at least part of the side of the edge region.

[0006] In some embodiments, the width of the top surface of the retaining wall away from the base is smaller than the width of the bottom surface of the retaining wall near the base;

[0007] The width of the top surface is the dimension of the top surface in the direction away from the display area; the width of the bottom surface is the dimension of the bottom surface in the direction away from the display area;

[0008] The first side of the retaining wall near the display area forms a first acute angle with the base;

[0009] The second side of the retaining wall, away from the display area, forms a second acute angle with the base;

[0010] The first acute angle is less than 80°, and the second acute angle is less than 80°.

[0011] In some embodiments, the angle range of the first acute angle is 40° to 60°;

[0012] The angle range of the second acute angle is 40° to 60°.

[0013] In some embodiments, the width of the top surface of the retaining wall away from the base is less than or equal to the width of the bottom surface of the retaining wall near the base;

[0014] The width of the top surface is the dimension of the top surface in the direction away from the display area; the width of the bottom surface is the dimension of the bottom surface in the direction away from the display area;

[0015] The first side of the retaining wall near the display area forms an angle of 80° to 90° with the base.

[0016] The second side of the retaining wall, away from the display area, forms an angle of 80° to 90° with the base.

[0017] In some embodiments, the edge region further includes an included angle position.

[0018] The retaining wall breaks at the included angle.

[0019] In some embodiments, the edge region further includes an included angle position;

[0020] The retaining wall is connected at the included angle.

[0021] The retaining wall is continuous at the side position, and the number of retaining walls is one.

[0022] In some embodiments, the retaining wall includes a first retaining wall, the number of which is one; the first retaining wall is distributed at each of the side positions of the edge region; the first retaining wall is continuous at the side positions.

[0023] In some embodiments, the edge region includes a first side edge region and a second side edge region; the first side edge region includes a first area and a second area, which are disposed opposite to each other; the second side edge region includes a third area and a fourth area, which are disposed opposite to each other.

[0024] The first retaining wall includes a first sub-retaining wall and a second sub-retaining wall, the first sub-retaining wall being located in the first side edge area and the second retaining wall being located in the second side edge area;

[0025] The distance between the end of the first sub-retaining wall closest to the second sub-retaining wall and the second sub-retaining wall is 5-10 mm.

[0026] The distance between the end of the second sub-retaining wall closest to the first sub-retaining wall and the first sub-retaining wall is 5-10 mm.

[0027] In some embodiments, the retaining wall further includes a second retaining wall.

[0028] The orthographic projection of the second retaining wall on the base lies between the orthographic projection of the first retaining wall on the base and the orthographic projection of the display area on the base; the second retaining wall and the first retaining wall are spaced apart from each other;

[0029] The number of the second retaining wall is at least one;

[0030] The second retaining wall comprises multiple segments, which are spaced apart from each other.

[0031] In some embodiments, the second retaining wall is distributed at each side position of the edge region.

[0032] In some embodiments, the second retaining wall is distributed on a portion of the side of the edge area, and the side locations of the second retaining wall are not adjacent to each other.

[0033] In some embodiments, the number of the second retaining walls is at least two.

[0034] At least two second retaining walls are arranged at intervals along a direction away from the display area;

[0035] The positions of the segments of two adjacent second retaining walls correspond; or, the positions of the segments of two adjacent second retaining walls are staggered.

[0036] In some embodiments, the system further includes a sealing adhesive and an alignment film, wherein the sealing adhesive, the alignment film, and the retaining wall are located on the same side of the substrate.

[0037] The orthographic projection of the retaining wall on the substrate lies between the orthographic projection of the sealing adhesive on the substrate and the orthographic projection of the display area on the substrate;

[0038] The orthographic projection of the alignment membrane onto the substrate lies within the area enclosed by the orthographic projection of the retaining wall onto the substrate;

[0039] The orthographic projections of the sealing adhesive and the retaining wall on the substrate do not overlap;

[0040] The alignment membrane and the barrier wall may or may not overlap in their orthogonal projections onto the substrate;

[0041] The orthographic projections of the alignment film and the sealing adhesive on the substrate do not overlap.

[0042] Secondly, embodiments of this disclosure also provide a display panel, which includes the aforementioned display substrate.

[0043] Thirdly, embodiments of this disclosure also provide a method for preparing a display substrate, wherein the display substrate has a display area and an edge area, the edge area surrounding the periphery of the display area; the edge area includes a plurality of side positions;

[0044] The preparation method includes: preparing a retaining wall on one side of the substrate;

[0045] The retaining wall is located at least a portion of the side of the edge area.

[0046] In some embodiments, the preparation of a retaining wall on one side of the substrate includes:

[0047] A retaining membrane layer is formed on one side of the substrate;

[0048] The retaining wall film layer is exposed using a photomask;

[0049] The mask plate includes a first pattern and a slit pattern, wherein the slit pattern is disposed on opposite sides of the first pattern;

[0050] The intermediate structure of the retaining wall is formed by corresponding to the first graphic.

[0051] The first and second sides of the retaining wall are formed by the corresponding slit pattern.

[0052] The width of the top surface of the retaining wall away from the base is smaller than the width of the bottom surface of the retaining wall near the base;

[0053] The width of the top surface is the dimension of the top surface in the direction away from the display area; the width of the bottom surface is the dimension of the bottom surface in the direction away from the display area;

[0054] The first side of the retaining wall near the display area forms a first acute angle with the base;

[0055] The second side of the retaining wall, away from the display area, forms a second acute angle with the base;

[0056] The first acute angle is less than 80°, and the second acute angle is less than 80°.

[0057] In some embodiments, the width of the slit pattern ranges from 2 to 3 μm.

[0058] The display substrate provided in this embodiment of the present disclosure, by providing a baffle at at least a portion of the side positions of the edge region of the display substrate, can, on the one hand, prevent the alignment film material from expanding outward into the sealant area during the preparation process, thereby avoiding problems such as affecting the detection of sealant particles, affecting the conductivity of conductive lines in the display substrate, and affecting the peeling of the sealant in subsequent processes; on the other hand, it can prevent the sealant from overflowing into the alignment film area during subsequent preparation processes, thereby avoiding the overflow of the sealant from affecting the alignment of the alignment film; and furthermore, it can prevent external moisture from entering the display substrate, thereby avoiding corrosion of metal lines caused by moisture.

[0059] The display panel provided in this embodiment improves the quality of the display panel by using the display substrate in the above embodiment. Attached Figure Description

[0060] The accompanying drawings are provided to further illustrate the embodiments of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the disclosure and do not constitute a limitation thereof. The above and other features and advantages will become more apparent to those skilled in the art from the detailed description of exemplary embodiments with reference to the accompanying drawings, in which:

[0061] Figure 1a is a top view of a display substrate provided in an embodiment of this disclosure.

[0062] Figure 1b is a structural cross-sectional view along the AA' section line in Figure 3a.

[0063] Figure 1c is a top view schematic diagram of another display substrate provided in an embodiment of this disclosure.

[0064] Figure 1d is a top view schematic diagram of another display substrate provided in an embodiment of this disclosure.

[0065] Figure 1e is a top view schematic diagram of another display substrate provided in an embodiment of this disclosure.

[0066] Figure 1f is another structural cross-sectional view along the AA' section line in Figure 1a.

[0067] Figure 2 is a top view schematic diagram of another display substrate provided in an embodiment of this disclosure.

[0068] Figure 3a is a schematic diagram of the fabrication process of a display substrate according to an embodiment of the present disclosure.

[0069] Figure 3b is a schematic diagram of the fabrication process of another display substrate in an embodiment of this disclosure. Detailed Implementation

[0070] To enable those skilled in the art to better understand the technical solutions of the embodiments of this disclosure, the following describes in further detail a display substrate, its preparation method, and a display panel provided by the embodiments of this disclosure, in conjunction with the accompanying drawings and specific implementation methods.

[0071] Embodiments of this disclosure will be described more fully below with reference to the accompanying drawings; however, the embodiments shown may be embodied in different forms and should not be construed as limited to the embodiments set forth in this disclosure. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will enable those skilled in the art to fully understand the scope of this disclosure.

[0072] This disclosure is not limited to the embodiments shown in the accompanying drawings, but includes modifications to the configuration based on the manufacturing process. Therefore, the areas illustrated in the drawings are schematic, and the shapes of the areas shown illustrate specific shapes of the areas, but are not intended to be limiting.

[0073] In related technologies, a liquid crystal display panel includes a first substrate and a second substrate, which are fitted together and their edges are sealed with a frame adhesive; the fitted together of the first substrate and the second substrate forms a cell gap, which is filled with liquid crystal. Both the first substrate and the second substrate include a substrate and an alignment film disposed on one side of the substrate.

[0074] In related technologies, alignment membrane materials tend to expand outward into the sealing adhesive area during the preparation process, while the sealing adhesive tends to overflow into the alignment membrane area during subsequent preparation processes.

[0075] In order to solve the above-mentioned problems in the related art, in a first aspect, referring to FIG1a-1f and FIG2, an embodiment of the present disclosure provides a display substrate having a display area 100 and an edge area 101, the edge area 101 surrounding the periphery of the display area 100, and the edge area 101 including a plurality of side positions; the display substrate includes a substrate 1; and a barrier 2 located on one side of the substrate 1 and located at least a portion of the side positions of the edge area 101.

[0076] In some embodiments, referring to FIG1a, the display substrate further includes a sealing adhesive 3 and an alignment film 4. The sealing adhesive 3, the alignment film 4, and the barrier 2 are located on the same side of the substrate 1. The orthographic projection of the barrier 2 on the substrate 1 is located between the orthographic projection of the sealing adhesive 3 on the substrate 1 and the orthographic projection of the display area 100 on the substrate 1. The orthographic projection of the alignment film 4 on the substrate 1 is located within the area enclosed by the orthographic projection of the barrier 2 on the substrate 1. The orthographic projections of the sealing adhesive 3 and the barrier 2 on the substrate 1 do not overlap. The orthographic projections of the alignment film 4 and the barrier 2 on the substrate 1 may partially overlap or not overlap. The orthographic projections of the alignment film 4 and the sealing adhesive 3 on the substrate 1 do not overlap.

[0077] By providing a baffle 2 at least partially on the side of the edge region 101 of the display substrate, the alignment film 4 material can be prevented from expanding outward into the sealant 3 area during the preparation process. This avoids affecting the detection of sealant fineness (i.e., the width detection of sealant 3) and the conductivity of conductive lines in the display substrate in subsequent processes. (For example, if the conductive lines in the display substrate extend from the area where the alignment film 4 is located to the area where the sealant 3 is located, and are electrically connected to the circuit in the substrate through conductive particles in a local area of ​​the sealant 3, if the conductive lines in the area where the sealant 3 is located are covered by the outwardly expanding alignment film 4 material, the electrical connection between the conductive lines and the conductive particles in the sealant cannot be achieved.) This prevents problems such as poor adhesion between the conductive lines in the display substrate and the circuits in the cell substrate, and the peeling of the sealant 3 (the sealant 3 is in direct contact with the outwardly extended alignment film 4, which easily leads to peeling due to poor adhesion between the sealant 3 and the alignment film 4). On the other hand, it can prevent the sealant 3 from overflowing into the area where the alignment film 4 is located during subsequent manufacturing processes (such as when the sealant is applied or joined, the sealant 3 may easily exceed its application area), thereby avoiding the overflow of the sealant 3 from affecting the alignment of the alignment film 4. Furthermore, it can prevent external moisture from entering the display substrate, thereby avoiding corrosion of the metal lines caused by moisture.

[0078] In some embodiments, referring to Figures 1a and 1b, Figure 1a is a top view of a display substrate provided in an embodiment of the present disclosure; Figure 1b is a structural cross-sectional view along the AA' section line in Figure 1a; the width s0 of the top surface m1 of the barrier 2 away from the substrate 1 is less than the width s1 of the bottom surface m2 of the barrier 2 near the substrate 1; the width s0 of the top surface m1 is the dimension of the top surface m1 in the direction away from the display area 100; the width s1 of the bottom surface m2 is the dimension of the bottom surface m2 in the direction away from the display area 100; the first side surface m3 of the barrier 2 near the display area 100 forms a first acute angle α1 with the substrate 1; the second side surface m4 of the barrier 2 away from the display area 100 forms a second acute angle α2 with the substrate 1; the first acute angle α1 is less than 80°, and the second acute angle α2 is less than 80°.

[0079] In this embodiment, the width s0 of the top surface m1 of the retaining wall 2 is the length dimension of the side edge away from the base 1 along the cross section of the retaining wall 2 perpendicular to the base 1 and its extension direction; the width s1 of the bottom surface m2 of the retaining wall 2 is the length dimension of the side edge near the base 1 along the cross section of the retaining wall 2 perpendicular to the base 1 and its extension direction.

[0080] In this embodiment, the slope angle between the first side m3 and the second side m4 of the retaining wall 2 and the substrate 1 is small. This makes the slope of the first side m3 and the second side m4 relative to the substrate 1 more gentle. Thus, during the cleaning process after the retaining wall 2 is developed, the water flow can more easily clean the developer at the slope angle position around the retaining wall 2, thereby improving or preventing the developer from remaining at the slope angle position around the retaining wall 2. This further improves or prevents the residual developer from entering the display panel using the display substrate and causing display defects, such as residual developer entering the liquid crystal and causing blackening defects and image retention defects in the liquid crystal display panel.

[0081] In some embodiments, the angle range of the first acute angle α1 is 40° to 60°; the angle range of the second acute angle α2 is 40° to 60°.

[0082] In some embodiments, referring to FIG1a, the edge region 101 further includes an angled position where the retaining wall 2 breaks off.

[0083] By breaking the barrier 2 at the angle, it is possible to prevent the barrier 2 from connecting at the angle to form a barrier corner, thereby preventing the developer from remaining at the barrier corner and thus preventing the residual developer from entering the display panel using the display substrate and causing display defects, such as residual developer entering the liquid crystal and causing blackening defects and image retention defects in the corners of the liquid crystal display panel.

[0084] In some embodiments, referring to FIG1a, the barrier 2 includes a first barrier 21, and the number of first barrier 21 is one; the first barrier 21 is distributed at each side position of the edge region 101; the first barrier 21 is continuous at the side positions. This can better prevent the alignment film 4 material from expanding outward into the sealing adhesive 3 setting area during the preparation process, and at the same time better prevent the sealing adhesive 3 from overflowing into the alignment film 4 area in subsequent preparation processes.

[0085] In some embodiments, referring to FIG1a, the display substrate includes a first side edge region 101a and a second side edge region 101b. The first side edge region 101a includes a first region and a second region, which are disposed opposite to each other. The second side edge region 101b includes a third region and a fourth region, which are disposed opposite to each other. For example, referring to FIG1a, the first region may be the region on the left side of the first side edge region 101a, the second region may be the region on the right side of the first side edge region 101a, the third region may be the region on the upper side of the second side edge region 101b, and the fourth region may be the region on the lower side of the first side edge region 101b. The first retaining wall 21 includes a first sub-retaining wall 21a and a second sub-retaining wall 21b. The first sub-retaining wall 21a is located in the first side edge region 101a, and the second sub-retaining wall 21b is located in the second side edge region 101b. The distance s2 between the end of the first sub-retaining wall 21a closest to the second sub-retaining wall 21b and the second sub-retaining wall 21b is in the range of 5 to 10 mm. The distance s3 between the end of the second sub-retaining wall 21b closest to the first sub-retaining wall 21a and the first sub-retaining wall 21a is in the range of 5 to 10 mm.

[0086] This configuration further avoids the formation of corners between sub-walls located in adjacent first and third zones, adjacent first and fourth zones, adjacent second and third zones, and adjacent second and fourth zones. This prevents developer residue from remaining in the corners of the wall, and consequently prevents residual developer from entering the display panel using this display substrate and causing display defects, such as residual developer entering the liquid crystal and causing blackening defects and image retention defects in the corners of the liquid crystal display panel.

[0087] In some embodiments, referring to FIG1c, a top view schematic diagram of another display substrate provided in an embodiment of the present disclosure is shown; wherein, the barrier 2 further includes a second barrier 22, the orthographic projection of the second barrier 22 on the substrate 1 is located between the orthographic projection of the first barrier 21 on the substrate 1 and the orthographic projection of the display area 100 on the substrate 1; the second barrier 22 and the first barrier 21 are spaced apart from each other; the number of second barriers 22 is at least one; the second barrier 22 includes a plurality of sub-segments 220, the plurality of sub-segments 220 being spaced apart from each other.

[0088] With this configuration, the first barrier 21 can better prevent the alignment film 4 material from expanding outward into the area where the sealant 3 is placed during the preparation process, and at the same time better prevent the sealant 3 from overflowing into the area where the alignment film 4 is located in subsequent preparation processes; the second barrier 22 can fully contain the alignment film 4 material that has expanded outward into the area where the barrier 2 is located, thereby preventing the alignment film 4 material from further diffusing outward from the first barrier 21.

[0089] In some embodiments, referring to FIG1c, the second retaining wall 22 is distributed at each side position of the edge region 101.

[0090] In some embodiments, referring to Figures 1d and 1e, Figure 1d is a top view of another display substrate provided in an embodiment of the present disclosure; Figure 1e is a top view of yet another display substrate provided in an embodiment of the present disclosure; the second barrier 22 is distributed on a portion of the side position of the edge region 101, and the side positions where the second barrier 22 is located are not adjacent to each other.

[0091] In some embodiments, referring to Figures 1d and 1e, there are multiple second barrier walls 22, which are arranged sequentially at intervals along a direction away from the display area 100.

[0092] The second barrier 22 further prevents the alignment film 4 material from expanding outward into the area where the sealant 3 is located during the preparation process, and also further prevents the sealant 3 from overflowing into the area where the alignment film 4 is located in subsequent preparation processes. Referring to Figures 1d and 1e, theoretically, the same number of barrier walls 2 should be provided on each side of the edge region 101. However, due to insufficient space on some side positions (such as the first and second regions, or the third and fourth regions), only one barrier wall 2 is provided. Therefore, the number of barrier walls 2 provided on each side position of the edge region 101 is determined according to whether there is sufficient space on each side position.

[0093] In some embodiments, referring to FIG1d, the number of second barrier walls 22 is two. In other embodiments, the number of second barrier walls 22 is more than two. At least two second barrier walls 22 are arranged sequentially at intervals along a direction away from the display area 100; the sub-segments 220 of adjacent two second barrier walls 22 are positioned correspondingly.

[0094] In some embodiments, referring to FIG1e, the segments 220 of two adjacent second retaining walls 22 are staggered. The staggered segments 220 can better accommodate the alignment film 4 material that expands outward during the preparation process, thereby better preventing the alignment film 4 material from expanding outward into the setting area of ​​the sealant 3 during the preparation process.

[0095] The inventors of this disclosure have discovered that the developer residue of the barrier 2 located at the corner of the edge region 101 is much more serious than that of the barrier 2 located at the side of the edge region 101. Therefore, the developer residue problem at the corner of the edge region 101 can be addressed to improve the defects of the display panel using the display substrate. Based on this, in some embodiments, referring to FIG1f, which is a cross-sectional view along the AA' section line in FIG1a, the width s0 of the top surface m1 of the barrier 2 away from the substrate 1 is less than or equal to the width s1 of the bottom surface m2 of the barrier 2 near the substrate 1; the width s0 of the top surface m1 is the dimension of the top surface m1 in the direction away from the display area 100; the width s1 of the bottom surface m2 is the dimension of the bottom surface m2 in the direction away from the display area 100; the first side surface m3 of the barrier 2 near the display area 100 forms an angle of 80° to 90° with the substrate 1; the second side surface m4 of the barrier 2 away from the display area 100 forms an angle of 80° to 90° with the substrate 1. By setting the barrier 2 to break at the angle position of the edge area 101 in this way, the developer residue at the angle position of the edge area 101 can be avoided, and the defects of the display panel using this display substrate can be improved. Furthermore, by setting the first side m3 of the barrier 2 near the display area 100 to form an angle of 80° to 90° with the substrate 1, and the second side m4 of the barrier 2 away from the display area 100 to form an angle of 80° to 90° with the substrate 1, conventional photomasks can be used when fabricating the barrier 2, eliminating the need for halftone photomasks, thus reducing the cost of using photomasks and lowering the difficulty of fabricating the barrier 2.

[0096] In some embodiments, referring to FIG2, FIG2 is a top view schematic diagram of another display substrate provided in an embodiment of the present disclosure. The edge region 101 further includes an included angle position; the barrier walls 2 are connected at the included angle position, and the barrier walls 2 are continuous at the side positions, with one barrier wall 2 in total.

[0097] In this embodiment, the cross-sectional shape of the baffle 2 in Figure 2 is shown in Figure 1b. The cross-section of the baffle 2 in Figure 2 is perpendicular to the substrate 1 and perpendicular to the extension direction of the baffle 2, while the extension direction of the baffle 2 is parallel to the substrate 1. Referring to Figure 2, the first baffles 21 distributed on each side of the edge region 101 are connected at the included angle. Through the above arrangement, it is possible to further prevent the alignment film 4 material from expanding outward into the sealing adhesive 3 area during the preparation process, and to prevent the sealing adhesive 3 from overflowing into the area where the alignment film 4 is located in subsequent preparation processes, as well as to prevent external moisture from entering the display substrate. Meanwhile, to prevent developer residue from remaining around the baffle 2, the cross-sectional shape of the baffle 2 in Figure 2 is set as shown in Figure 1b, so that the slope angle between the first side m3 and the second side m4 of the baffle 2 and the substrate 1 is smaller, making the slope of the first side m3 and the second side m4 relative to the substrate 1 more gentle. In this way, during the cleaning process after the baffle 2 is developed, the water flow can more easily clean the developer at the slope angle position around the baffle 2, thereby improving or preventing developer residue from remaining at the slope angle position around the baffle 2, and further improving or preventing residual developer from entering the display panel using the display substrate and causing display defects.

[0098] In some embodiments, the distance between adjacent first retaining walls 21 and second retaining walls 22 is 25 to 35 μm; the distance between any two adjacent second retaining walls 22 is 25 to 35 μm; and the width s0 of the top surface m1 of the retaining wall 2 is 15 to 25 μm.

[0099] In some embodiments, the distance between the sealing adhesive 3 and the barrier 2 furthest from the display area 100 ranges from 0 to 500 μm.

[0100] In some embodiments, the display substrate is a color filter substrate. Referring to Figures 1a, 1c-1e, and 2, the color filter substrate further includes a black matrix 5, a color resist layer 6, and a conductive layer (not shown in the figures). The black matrix 5, color resist layer 6, conductive layer, barrier 2, and alignment film 4 are stacked sequentially away from the substrate 1. The black matrix 5 is located in the display area 100 and covers the edge area 101. The color resist layer 6 is located in the display area 100 and a portion of the edge area 101 adjacent to the display area 100. The orthographic projection of the color resist layer 6 located in the edge area 101 onto the substrate 1 lies within the area enclosed by the orthographic projection of the barrier 2 onto the substrate 1. The orthographic projection of the alignment film 4 onto the substrate 1 lies within the area enclosed by the orthographic projection of the barrier 2 onto the substrate 1, and the alignment film 4 covers the entire display area 100. The conductive layer extends from the display area 100 to the edge area 101. Sealing adhesive 3 is applied to the color filter substrate during the alignment of the color filter substrate and the cell mounting substrate.

[0101] In some embodiments, the display substrate may also be an array substrate, which includes pixel circuits and alignment films, with the pixel circuits, barrier walls, and alignment films stacked sequentially away from the substrate; the pixel circuits are located in the display area and the edge area. Sealing adhesive is applied to the array substrate during the alignment of the array substrate and the cell-mount substrate.

[0102] Based on the above structure of the display substrate, this disclosure also provides a method for fabricating a display substrate, wherein the display substrate has a display area and an edge area, the edge area surrounding the periphery of the display area; the edge area includes multiple side positions; the fabrication method includes: fabricating a barrier on one side of the substrate; the barrier is located at at least a portion of the side positions of the edge area.

[0103] In some embodiments, referring to FIG3a, a schematic diagram of the fabrication process of a display substrate according to an embodiment of the present disclosure is shown; wherein, the preparation of the barrier 2 shown in FIG1b on one side of the substrate 1 includes: step S1: forming a barrier film layer 7 on one side of the substrate 1.

[0104] Step S2: Expose, develop and clean the barrier film layer 7 to form the pattern of the barrier 2.

[0105] In this step, a mask plate 8 is used to expose the barrier film layer 7; the mask plate 8 includes a first pattern 81 and a slit pattern 82, with the slit pattern 82 disposed on opposite sides of the first pattern 81; the first pattern 81 is used to form the middle structure of the barrier 2; the slit pattern 82 is used to form the first side m3 and the second side m4 of the barrier 2.

[0106] In this step, the barrier 2 formed by exposure using mask 8 is located in the edge area; the width of the top surface of the barrier 2 away from the substrate 1 is smaller than the width of the bottom surface of the barrier 2 near the substrate 1; the width of the top surface is the dimension of the top surface in the direction away from the display area; the width of the bottom surface is the dimension of the bottom surface in the direction away from the display area; the first side m3 of the barrier 2 near the display area forms a first acute angle α1 with the substrate 1; the second side m4 of the barrier 2 away from the display area forms a second acute angle α2 with the substrate 1; the first acute angle α1 is less than 80°, and the second acute angle α2 is less than 80°.

[0107] In this step, water is used to clean the developer solution after development, and finally a high-pressure air gun is used to peel off the water film after cleaning.

[0108] In some embodiments, the first pattern 81 and the slit pattern 82 are light-transmitting patterns.

[0109] In some embodiments, the width s4 of the slit pattern 82 ranges from 2 to 3 μm. Exposure light passing through the slit pattern 82 will diffract, thereby enabling the exposure to form a first side surface m3 with a slope angle of less than 80° and a second side surface m4 with a slope angle of less than 80°.

[0110] The retaining wall 2 prepared by the above preparation method has a reduced slope angle between its first side m3 and second side m4 and the substrate 1. This makes the slope of the first side m3 and second side m4 relative to the substrate 1 more gentle. Thus, during the cleaning process after the retaining wall 2 is developed, the water flow can more easily clean the developer at the slope angle position around the retaining wall 2, thereby improving or preventing the developer from remaining at the slope angle position around the retaining wall 2. This further improves or prevents the residual developer from entering the display panel using the display substrate and causing display defects, such as residual developer entering the liquid crystal and causing blackening defects and image retention defects in the liquid crystal display panel.

[0111] In some embodiments, referring to FIG3b, a schematic diagram of the fabrication process of another display substrate in this disclosure is shown; wherein, the barrier 2 shown in FIG1f is fabricated on one side of the substrate 1. Unlike the fabrication of the barrier 2 shown in FIG1b, a mask 8 is used to expose the barrier film layer 7; the mask 8 only includes a first pattern 81, and the barrier 2 is formed by corresponding to the first pattern 81.

[0112] In this step, the barrier 2 formed by exposure using mask 8 is located in the edge area; the width of the top surface of the barrier 2 away from the substrate 1 is less than or equal to the width of the bottom surface of the barrier 2 near the substrate 1; the width of the top surface is the dimension of the top surface in the direction away from the display area; the width of the bottom surface is the dimension of the bottom surface in the direction away from the display area; the first side m3 of the barrier 2 near the display area forms an angle of 80° to 90° with the substrate 1; the second side m4 of the barrier 2 away from the display area forms an angle of 80° to 90° with the substrate 1.

[0113] The display substrate provided in this embodiment of the present disclosure, by providing a baffle at at least a portion of the side positions of the edge region of the display substrate, can, on the one hand, prevent the alignment film material from expanding outward into the sealant area during the preparation process, thereby avoiding problems such as affecting the detection of sealant particles, affecting the conductivity of conductive lines in the display substrate, and affecting the peeling of the sealant in subsequent processes; on the other hand, it can prevent the sealant from overflowing into the alignment film area during subsequent preparation processes, thereby avoiding the overflow of the sealant from affecting the alignment of the alignment film; and furthermore, it can prevent external moisture from entering the display substrate, thereby avoiding corrosion of metal lines caused by moisture.

[0114] Secondly, embodiments of this disclosure also provide a display panel, including the display substrate described in the above embodiments.

[0115] By using the display substrate in the above embodiments, the quality of the display panel is improved.

[0116] The display panel provided in this embodiment can be any product or component with display function, such as an LCD panel, LCD TV, LCD billboard, monitor, mobile phone, or navigator.

[0117] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A display substrate having a display area and an edge area, the edge area surrounding the periphery of the display area. in, The edge region includes multiple side locations; The display substrate includes a substrate; A retaining wall is located on one side of the base and at least part of the side of the edge region.

2. The display substrate according to claim 1, wherein, The width of the top surface of the retaining wall away from the base is smaller than the width of the bottom surface of the retaining wall near the base; The width of the top surface is the dimension of the top surface in the direction away from the display area; the width of the bottom surface is the dimension of the bottom surface in the direction away from the display area. The first side of the retaining wall near the display area forms a first acute angle with the base; The second side of the retaining wall, away from the display area, forms a second acute angle with the base; The first acute angle is less than 80°, and the second acute angle is less than 80°.

3. The display substrate according to claim 2, wherein, The angle range of the first acute angle is 40° to 60°; The angle range of the second acute angle is 40° to 60°.

4. The display substrate according to claim 1, wherein, The width of the top surface of the retaining wall away from the base is less than or equal to the width of the bottom surface of the retaining wall near the base; The width of the top surface is the dimension of the top surface in the direction away from the display area; the width of the bottom surface is the dimension of the bottom surface in the direction away from the display area. The first side of the retaining wall near the display area forms an angle of 80° to 90° with the base. The second side of the retaining wall, away from the display area, forms an angle of 80° to 90° with the base.

5. The display substrate according to any one of claims 2-4, wherein, The edge region also includes the included angle position. The retaining wall breaks at the included angle.

6. The display substrate according to claim 2 or 3, wherein, The edge region also includes the included angle position; The retaining wall is connected at the included angle. The retaining wall is continuous at the side position, and the number of retaining walls is one.

7. The display substrate according to claim 5, wherein, The retaining wall includes a first retaining wall, and the number of first retaining walls is one; the first retaining walls are distributed at each of the side positions of the edge area; the first retaining walls are continuous at the side positions.

8. The display substrate according to claim 7, wherein, The edge region includes a first side edge region and a second side edge region; the first side edge region includes a first area and a second area, which are arranged opposite to each other; the second side edge region includes a third area and a fourth area, which are arranged opposite to each other. The first retaining wall includes a first sub-retaining wall and a second sub-retaining wall, the first sub-retaining wall being located in the first side edge area and the second retaining wall being located in the second side edge area; The distance between the end of the first sub-retaining wall closest to the second sub-retaining wall and the second sub-retaining wall is 5-10 mm. The distance between the end of the second sub-retaining wall closest to the first sub-retaining wall and the first sub-retaining wall is 5-10 mm.

9. The display substrate according to claim 8, wherein, The retaining wall also includes a second retaining wall. The orthographic projection of the second retaining wall on the base lies between the orthographic projection of the first retaining wall on the base and the orthographic projection of the display area on the base; the second retaining wall and the first retaining wall are spaced apart from each other; The number of the second retaining wall is at least one; The second retaining wall comprises multiple segments, which are spaced apart from each other.

10. The display substrate according to claim 9, wherein, The second retaining wall is distributed at each side position of the edge area.

11. The display substrate according to claim 9, wherein, The second retaining wall is distributed on a portion of the side of the edge area, and the side positions where the second retaining wall is located are not adjacent to each other.

12. The display substrate according to any one of claims 9-11, wherein, The number of the second retaining walls is at least two. At least two second retaining walls are arranged at intervals along a direction away from the display area; The positions of the segments of two adjacent second retaining walls correspond; or, the positions of the segments of two adjacent second retaining walls are staggered.

13. The display substrate according to claim 1, wherein, It also includes a sealing adhesive and an alignment film, wherein the sealing adhesive, the alignment film, and the retaining wall are located on the same side of the substrate. The orthographic projection of the retaining wall on the substrate lies between the orthographic projection of the sealing adhesive on the substrate and the orthographic projection of the display area on the substrate; The orthographic projection of the alignment membrane onto the substrate lies within the area enclosed by the orthographic projection of the retaining wall onto the substrate; The orthographic projections of the sealing adhesive and the retaining wall on the substrate do not overlap; The alignment membrane and the barrier wall may or may not overlap in their orthogonal projections onto the substrate; The orthographic projections of the alignment film and the sealing adhesive on the substrate do not overlap.

14. A display panel, wherein, Includes the display substrate as described in any one of claims 1-13.

15. A method for preparing a display substrate, wherein, The display substrate has a display area and an edge area, with the edge area surrounding the periphery of the display area; The edge region includes multiple side locations; The preparation method includes: preparing a retaining wall on one side of the substrate; The retaining wall is located at least a portion of the side of the edge area.

16. The method for preparing a display substrate according to claim 15, wherein, The preparation of a retaining wall on one side of the substrate includes: A retaining membrane layer is formed on one side of the substrate; The retaining wall film layer is exposed using a photomask; The mask plate includes a first pattern and a slit pattern, wherein the slit pattern is disposed on opposite sides of the first pattern; The intermediate structure of the retaining wall is formed by corresponding to the first graphic. The first and second sides of the retaining wall are formed by the corresponding slit pattern. The width of the top surface of the retaining wall away from the base is smaller than the width of the bottom surface of the retaining wall near the base; The width of the top surface is the dimension of the top surface in the direction away from the display area; the width of the bottom surface is the dimension of the bottom surface in the direction away from the display area. The first side of the retaining wall near the display area forms a first acute angle with the base; The second side of the retaining wall, away from the display area, forms a second acute angle with the base; The first acute angle is less than 80°, and the second acute angle is less than 80°.

17. The preparation method according to claim 16, wherein, The width of the slit pattern ranges from 2 to 3 μm.

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