Display substrate, preparation method thereof and display device

Abstract

Embodiments of the present application provide a display substrate and a display panel. The display substrate comprises a pixel area and a non-pixel area, and comprises a substrate, a touch lead, a composite film layer comprising a touch electrode and having a slot hole, a pixel electrode, and a bridge electrode covering the sidewall and the bottom of the slot hole and at least partially protruding from the surface of the pixel electrode. The touch lead is connected to the touch electrode through the bridge electrode. In the embodiments of the present application, the protruding part of the bridge electrode from the pixel electrode forms a blocking dam to isolate the inside and outside of the slot hole, so that the inside of the slot hole is relatively closed, preventing or reducing the impurity ions in the liquid crystal from entering the slot hole. Meanwhile, a structural basis is provided for forming an electric field at the bridge electrode, and the electric field drives the impurity ions to move in a direction away from the slot hole, avoiding the occurrence of vertical black stripes on the display panel, and improving the display effect and product yield.

Description

TECHNICAL FIELD

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

[0002] Touch panels have developed from early out-cell (i.e. glass with touch sensors is attached to the liquid crystal panel) to in-cell (i.e. touch sensors are integrated into thin film transistor liquid crystal panels) and gradually replaced. Compared with out-cell, in-cell touch reduces the overall thickness and weight of the product, provides a better touch experience, and reduces costs. However, in-cell products also encounter new problems brought by new products and new technologies. The vertical black stripes caused by the internal sensor hole (sensor stripes) are problems that appear with new technologies.

[0003] At present, in the manufacturing process of in-cell thin film transistor liquid crystal display (TFT-LCD) panels, many process steps will be affected by electro-static discharge (ESD) and ion contamination, resulting in a large number of ions in the process. These ions will gradually accumulate in the internal sensor hole during the process, resulting in a large number of ions accumulating in the sensor hole and being unable to dissipate effectively. When lighting, many vertical black stripes appear on the surface of the panel, which greatly affects the display effect of the panel and reduces the yield of the product. SUMMARY

[0004] The present application proposes a display substrate and a preparation method thereof, and a display device to overcome the shortcomings of the prior art.

[0005] In a first aspect, the embodiments of the present application provide a display substrate, comprising a plurality of pixel regions arranged at intervals and a non-pixel region located at the periphery of each pixel region, comprising:

[0006] a substrate;

[0007] a touch lead line located on one side of the substrate, and the orthographic projection of the touch lead line on the substrate is located in the non-pixel region;

[0008] a composite film layer comprising a touch electrode, located on the side of the touch lead line away from the substrate, and the area of the composite film layer located in the non-pixel region has a slot hole penetrating to the touch lead line;

[0009] a pixel electrode located on the side of the composite film layer away from the touch lead line, and the orthographic projection of the pixel electrode on the substrate is located in the pixel region;

[0010] The bridge electrode is located in the non-pixel area in the orthographic projection on the substrate, and covers at least part of the sidewall and at least part of the bottom of the slot hole, and the side surface of the bridge electrode away from the substrate at least partially protrudes from the side surface of the pixel electrode away from the substrate;

[0011] The touch lead wire is connected with the touch electrode through the bridge electrode and the pixel electrode.

[0012] In some embodiments of the present application, the bridge electrode at least includes a first bridge segment and a second bridge segment, the second bridge segment covers at least part of the sidewall and at least part of the bottom of the slot hole, the side of the second bridge segment away from the substrate protrudes from the side surface of the pixel electrode away from the substrate, the second bridge segment is connected with the first bridge segment, and the first bridge segment is connected with the touch electrode.

[0013] In some embodiments of the present application, the bridge electrode further includes a third bridge segment, the first bridge segment and the second bridge segment are respectively located on two sides of the slot hole in the direction perpendicular to the cross section of the substrate, and the first bridge segment located on one side is connected with the third bridge segment located on the other side through the second bridge segment.

[0014] In some embodiments of the present application, the included angle between the first bridge segment and the part of the second bridge segment protruding from the pixel electrode is an acute angle, and / or the included angle between the third bridge segment and the part of the second bridge segment protruding from the pixel electrode is an acute angle.

[0015] In some embodiments of the present application, the orthographic projection of the touch lead wire on the substrate covers the orthographic projection of the second bridge segment on the substrate.

[0016] In some embodiments of the present application, the composite film layer further includes a first inorganic layer, an organic layer and a second inorganic layer, the first inorganic layer, the organic layer, the touch electrode and the second inorganic layer are sequentially stacked from the touch lead wire to the side of the touch lead wire away from the substrate, the second inorganic layer has at least one through hole, and the first bridge segment is filled in the through hole and connected with the touch electrode through the through hole.

[0017] In some embodiments of the present application, at least one of the first inorganic layer, the organic layer, the touch electrode and the second inorganic layer includes a flat segment and a protruding segment, the side surface of the protruding segment away from the substrate protrudes from the side surface of the flat segment away from the substrate, and the orthographic projection of the bridge electrode on the substrate covers the orthographic projection of the protruding segment on the substrate.

[0018] In some embodiments of the present application, the display substrate further includes an alignment layer, the alignment layer is located on the side of the pixel electrode away from the substrate, and the alignment layer is conformally arranged on the side surface of the pixel electrode and the bridge electrode away from the substrate.

[0019] In some embodiments of the present application, the opening width of the slot hole in the cross section away from the substrate is greater than the opening width of the slot hole in the cross section close to the substrate.

[0020] In a second aspect, the embodiments of the present application provide a display device, comprising the display substrate according to any one of the embodiments of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0022] Figure 1 is a top view schematic diagram of a display substrate in one embodiment of the present application;

[0023] Figure 2 is a top view schematic diagram of a display substrate in one embodiment of the present application; Figure 1 is a cross-sectional view schematic diagram at B-B' in the above figure;

[0024] Figure 3 is a cross-sectional view schematic diagram at A-A' in the above figure; Figure 1 is a cross-sectional view schematic diagram at A-A' in the above figure;

[0025] Figure 4 is a top view schematic diagram of a display substrate in one embodiment of the present application;

[0026] Figure 5 is an electric field schematic diagram of a display substrate in another embodiment of the present application;

[0027] Figure 6 is a flow schematic diagram of a preparation method of a display panel in one embodiment of the present application;

[0028] Figures 7A-7G is a step-by-step schematic diagram of a preparation method of a display substrate in another embodiment of the present application. DETAILED DESCRIPTION

[0029] The present application is described in detail below, examples of embodiments of the present application are shown in the accompanying drawings, in which the same or similar reference signs represent the same or similar components or components having the same or similar functions throughout. In addition, if a detailed description of known technology is unnecessary for the features of the present application shown, it is omitted. The embodiments described below by reference to the accompanying drawings are exemplary and are for the purpose of explaining the present application only, and cannot be interpreted as limiting the present application.

[0030] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with meanings in the context of the present technology, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such herein.

[0031] Those skilled in the art can understand that the singular forms "a," "an," and "the" used herein include plural references unless expressly stated to the contrary. It should further be understood that the word "comprising" used in the specification of the application means that the features, integers, steps, operations, elements, and / or components listed thereafter exist, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be an intermediate element. In addition, "connected" or "coupled" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any one of the associated listed items and all combinations thereof.

[0032] It is found that in the display substrate of the related art, there are technical problems such as the appearance of several vertical black stripes on the surface of the display substrate in the process of lighting, poor display effect, and low product yield.

[0033] The embodiment of the present application sets the bridge electrode 10 on the sidewall and bottom surface of the slot hole in the composite film layer, the bridge electrode 10 protrudes from part of the pixel electrode 9 to form a blocking dam, which isolates the inside and outside of the slot hole, so that the slot hole is relatively closed, preventing or reducing the impurity ions 13 in the liquid crystal from entering the slot hole; at the same time, it provides a structural basis for applying an electric field force on the bridge electrode 10 away from the side of the slot hole, driving the impurity ions 13 to move away from the slot hole, further reducing the impurity ions 13 from entering the slot hole, avoiding the appearance of vertical black stripes on the display panel, and improving the display effect and product yield.

[0034] The display substrate and the preparation method thereof and the display device provided by the present application are aimed at solving the above technical problems of the prior art. The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments.

[0035] In a first aspect, the embodiment of the present application provides a display substrate. As shown in Figure 1 and Figure 2 , it is a top view schematic diagram of the display substrate in an embodiment of the present application; Figure 1 is a top view schematic diagram of the display substrate in an embodiment of the present application; Figure 2 is Figure 1 a cross-sectional view at B-B' in FIG. 1. The display substrate comprises a plurality of pixel regions arranged at intervals and a non-pixel region located at the periphery of each pixel region, comprising:

[0036] a substrate 1;

[0037] a touch lead 4 located on one side of the substrate 1, and the orthographic projection of the touch lead 4 on the substrate is at least located in the non-pixel region;

[0038] The composite film layer includes the touch electrode 7, is located at the side of the touch lead 4 away from the substrate 1, and has at least a through slot hole to the touch lead in the area of the non-pixel region;

[0039] The pixel electrode 9 is located at the side of the composite film layer away from the touch lead 4, and the orthographic projection on the substrate is located in the pixel region;

[0040] The bridge electrode 10 has the orthographic projection on the substrate located in the non-pixel region, covers at least part of the side wall and at least part of the bottom of the slot hole, and the surface of the bridge electrode 10 away from the substrate 1 at least partially protrudes from the surface of the pixel electrode 9 away from the substrate 1;

[0041] The touch lead 4 is connected with the touch electrode 7 through the bridge electrode 10 and the pixel electrode 9.

[0042] In the embodiment, the slot hole is opened in the area of the composite film layer in the non-pixel region, the slot hole at least penetrates the second inorganic layer 8, the touch electrode 7, and the organic layer 6, and the slot hole penetrates part of the first inorganic layer 5 to expose at least part of the area of the touch lead 4.

[0043] The touch lead 4 covers part of the area of the substrate 1, the composite film layer is located at the side of the touch lead 4 away from the substrate 1 and covers the touch lead 4. Part of the composite film layer covers the touch lead 4, and another part of the composite film layer covers the area of the substrate 1 not covered by the touch lead 4.

[0044] In some embodiments of the present application, the bridge electrode 10 at least includes a first bridge segment 10a and a second bridge segment 10b, the second bridge segment 10b covers at least part of the side wall and at least part of the bottom of the slot hole, the second bridge segment 10b protrudes from the surface of the pixel electrode 9 away from the substrate 1, the second bridge segment 10b is connected with the first bridge segment 10a, and the first bridge segment 10a is connected with the touch electrode 7.

[0045] In another embodiment, the bridge electrode 10 further includes a third bridge segment 10c, the first bridge segment 10a and the second bridge segment 10b are respectively located on two sides of the slot hole in the direction perpendicular to the substrate 1, the first bridge segment 10a located on one side is connected with the third bridge segment 10c located on the other side through the second bridge segment 10b.

[0046] The bridge electrode 10 is arranged on the side wall and the bottom surface of the slot hole in the composite film layer, and the bridge electrode 10 covering the slot hole is the second bridge segment 10b. One end of the second bridge segment 10b close to the substrate 1 is electrically connected with the touch lead 4, and the other end of the second bridge segment 10b away from the substrate 1 protrudes from the side surface of the slot hole away from the substrate 1, that is, the height of the second bridge segment 10b perpendicular to the substrate 1 is greater than the depth of the slot hole perpendicular to the substrate 1.

[0047] The bridge electrode 10 further comprises a first bridge segment 10a connected with the second bridge segment 10b, the first bridge segment 10a is electrically connected with the pixel electrode 9, the touch lead 4 is connected with the pixel electrode 9 through the bridge electrode 10

[0048] The indirect electrical connection is realized.

[0049] The part of the bridge electrode 10 protruding from the pixel electrode 9 forms a blocking dam, which separates the inside and outside of the slot hole, so that the inside of the slot hole is relatively closed. After the display substrate and the color filter substrate 15 are completed, since the bridge electrode 10 protrudes from the pixel electrode 9, the distance between the bridge electrode 10 and the color filter substrate 150 is smaller than the distance between the pixel electrode 9 and the color filter substrate 15, and the impurity ions 13 between the pixel electrode 9 and the color filter substrate 15 are at least partially blocked by the above-mentioned blocking dam during movement, preventing or reducing the impurity ions 13 in the liquid crystal from entering the slot hole.

[0050]

[0051] The bridge electrode 10 further comprises a third bridge segment 10c located on the side of the second bridge segment 10b away from the first bridge segment 10a, and the second bridge segment 10b is connected with the first bridge segment 10a and the third bridge segment 10c respectively.

[0052] In another embodiment, the display substrate is energized to generate an electric field at the bridge electrode 10. Since the bridge electrode 10 covers the bottom and sidewall of the slot hole, a ring-shaped electric field is generated at the bridge electrode 10. In the ring-shaped electric field, a repulsive force is generated between the bridge electrode 10 and the impurity ions 13, and the electric field drives the impurity ions 13 to move away from the slot hole, further reducing the impurity ions 13 entering the slot hole, avoiding the occurrence of vertical black stripes on the display panel, and improving the display effect and product yield.

[0053]

[0054] Optionally, when the potential of the bridge electrode 10 is higher than that of the pixel electrode 9, the impurity ions 13 with positive charges in the liquid crystal cannot enter the slot hole; similarly, if the potential of the bridge electrode 10 is lower than that of the pixel electrode 9, the ring-shaped electric field formed thereby can effectively prevent the impurity ions 13 with negative charges from gathering towards the slot hole, thus effectively avoiding the occurrence of vertical black stripe defects.

[0055] 5As Figure 3 shown, Figure 3 is Figure 1 a cross-sectional view of A-A' in FIG. 5. The display substrate further comprises

[0056] ​​The first metal layer 2; the gate insulating layer 3; the 16-semiconductor layer; the 17-electrode insulating layer; the 12-data line. The touch lead 4 is in the same layer with the data line 12 and is arranged with a certain interval. The gate insulating layer 3 is between the touch lead 4 and the first metal layer 2, and separates the touch lead 4 and the first metal layer 2, and separates the first metal layer 2 and the data line 12, so as to prevent the short circuit between the touch lead 4 and the first metal layer 2, and between the first metal layer 2 and the data line 12. The material of the semiconductor layer 16 is metal oxide. The electrode insulating layer 17 separates the semiconductor layer 16 and at least part of the touch lead 4 or the data line 12. The electrode insulating layer 17 is provided with at least one through hole, and the touch lead 4 or the data line 12 is filled in the through hole and connected with the semiconductor layer 16.

[0057] In some embodiments of the present application, the included angle between the first bridge segment 10a and the part of the pixel electrode 9 protruding therefrom is an acute angle, and / or the included angle between the third bridge segment 10c and the part of the pixel electrode 9 protruding therefrom is an acute angle.

[0058] In some embodiments of the present application, the opening width on the cross section of the slot hole away from the substrate 1 is greater than the opening width on the cross section close to the substrate 1.

[0059] In some embodiments, the second bridge segment 10b only covers part of the area of the side wall and part of the area of the bottom of the slot hole.

[0060] In some embodiments, the second bridge segment 10b covers the entire area of the side wall and the entire area of the bottom of the slot hole. The orthographic projection contour of the second bridge segment 10b on the substrate 1 is circular, elliptical or rectangular. The orthographic projection contour of the second bridge segment 10b is a closed figure, and the electric field intensity formed by the second bridge segment 10b is relatively high, and the repulsive force between the bridge electrode 10 and the impurity ions 13 is relatively large.

[0061] In a specific embodiment, the display substrate is an array substrate, and the array substrate is combined with the color film substrate 15 to form a display panel. The cell thickness of the display panel is 2.6 microns, and the film layer thickness of the pixel electrode 9 perpendicular to the substrate 1 is 720 angstroms The height of the second bridge segment 10b is not less than 1 micron and not more than 2 microns. The height of the part of the pixel electrode 9 protruding from the second bridge segment 10b is not less than 280 angstroms and not more than 1280 angstroms. It can ensure that the bridge electrode 10 has sufficient blocking effect, and it will not affect the normal flow of liquid crystal molecules 14.

[0062] Optionally, in the present embodiment, the height of the second bridge segment 10b is 1.6 microns, and the height of the part of the pixel electrode 9 protruding from the second bridge segment 10b is 880 angstroms.

[0063] In the process of manufacturing the trench and the bridge electrode 10, the etching rate and etching time of the etching solution are controlled. When the etching solution etches the trench and the second bridge section 10b on the side close to the substrate 1, lateral etching occurs, so that the side wall of the trench or the side wall of the second bridge section 10b is not perpendicular to the substrate 1, the substrate 1 is parallel to the bottom of the trench, and the included angle between at least one of the above two and the bottom of the trench is an obtuse angle. That is, the included angle between the part of the first bridge section 10a and the second bridge section 10b protruding from the pixel electrode 9 is an acute angle, and the included angle between the part of the third bridge section 10c and the second bridge section 10b protruding from the pixel electrode 9 is an acute angle. Specifically, the included angle is greater than or equal to 110 degrees.

[0064] In one embodiment, in the process of manufacturing the trench, no lateral etching occurs or the lateral etching is not obvious, and the side wall of the trench is perpendicular to the substrate 1. The thickness of the second bridge section 10b in the direction parallel to the substrate 1 is not equal everywhere, such as a gradual change. Specifically, the thickness of the second bridge section 10b on the side close to the substrate 1 is thin, and the thickness of the second bridge section 10b on the side away from the substrate 1 is thick. That is, the included angle between the part of the first bridge section 10a and the second bridge section 10b protruding from the pixel electrode 9 is an acute angle, and the included angle between the part of the third bridge section 10c and the second bridge section 10b protruding from the pixel electrode 9 is an acute angle. The second bridge section 10b covers the bottom and the side wall of the trench to form a cavity, and the profile of the cavity in the cross section perpendicular to the substrate 1 is a trapezoid with the top wide and the bottom narrow.

[0065] In another embodiment, in the process of manufacturing the trench, obvious lateral etching occurs, the included angle between the side wall of the trench and the substrate 1 is an acute angle, and the opening width of the trench in the cross section on the side away from the substrate 1 is greater than that on the side close to the substrate 1. The bottom and the side wall of the trench form a cavity, and the profile of the cavity in the cross section perpendicular to the substrate 1 is a trapezoid with the top wide and the bottom narrow. In the process of manufacturing the bridge electrode 10, the lateral etching is not obvious, and the thickness of the bridge electrode 10 in the direction parallel to the substrate 1 is equal everywhere, that is, the bridge electrode 10 uniformly covers the side wall of the trench. The shape of the bridge electrode 10 depends on the shape of the trench, so that the included angle between the part of the first bridge section 10a and the second bridge section 10b protruding from the pixel electrode 9 is an acute angle, the included angle between the part of the third bridge section 10c and the second bridge section 10b protruding from the pixel electrode 9 is an acute angle, and the opening width of the second bridge section 10b in the cross section on the side away from the substrate 1 is greater than that on the side close to the substrate 1.

[0066] In some embodiments of the present application, the composite film layer further comprises a first inorganic layer 5, an organic layer 6, and a second inorganic layer 8, the first inorganic layer 5, the organic layer 6, the touch electrode 7, and the second inorganic layer 8 are sequentially stacked from the touch lead 4 to the side of the touch lead 4 away from the substrate 1, and the second inorganic layer 8 has at least one through hole, and the first bridge segment 10a is filled in the through hole and connected with the touch electrode 7 through the through hole.

[0067] In the present embodiment, the first bridge segment 10a comprises a flat segment and a filling segment, the pixel electrode is arranged in the same layer as the flat segment of the first bridge segment 10a, the pixel electrode 9 and the touch electrode 7 are respectively located in different layers, the second inorganic layer 8 is located between the pixel electrode 9 and the touch electrode 7, the second inorganic layer 8 has at least one through hole penetrating through the second inorganic layer 8, the filling segment of the first bridge segment 10a is filled in the through hole, the first bridge segment 10a forms an electrical connection with the touch electrode 7, and further the touch lead 4 forms an electrical connection with the touch electrode 7 through the bridge electrode 10.

[0068] As shown in Figure 4 and Figure 5 , the present application is a top view schematic diagram of a display substrate in an embodiment of the present application. Figure 4 As shown in Figure 5 , the present application is an electric field schematic diagram of a display substrate in another embodiment of the present application. The display substrate further comprises a first gate line 18a, a second gate line 18b, a first data line 19a, a second data line 19b, a source electrode 21a, a drain electrode 21b, a slot hole area 20a, a through hole area 20b, a transistor 20c, and a bridge hole 20d between the drain electrode and the pixel electrode 9. Figure 5 The arrow in the middle represents the direction of the electric field, and the slot hole area 20a has a ring-shaped electric field.

[0069] In some embodiments of the present application, the pixel electrode 9 is respectively located on both sides of the slot hole in the direction perpendicular to the cross section of the substrate 1.

[0070] In the present embodiment, the plurality of pixel electrodes 9 parallel to the substrate 1 and located in different directions of the slot hole are located on the side of the bridge electrode 10 away from the slot hole. That is, taking the slot hole as the center, the first bridge segment 10a and the third bridge segment 10c of the bridge electrode 10 are arranged in the inner circle, and one or more pixel electrodes 9 are arranged in the outer circle.

[0071] In some embodiments of the present application, the orthogonal projection of the touch lead 4 on the substrate 1 covers the orthogonal projection of the second bridge segment 10b on the substrate 1.

[0072] In the present embodiment, the display substrate comprises a plurality of pixel areas arranged at intervals and a non-pixel area located around each pixel area, and the pixel electrode 9 is located in the pixel area of the display substrate.

[0073] The composite film layer is located in the pixel area and the non-pixel area of the display substrate, and the groove hole is located in the non-pixel area. The touch lead 4 is also located in the non-pixel area. The display substrate further comprises a black matrix, a projection of the black matrix on the substrate 1 covers a projection of the touch lead 4 on the substrate 1, and a projection of the touch lead 4 on the substrate 1 covers a projection of the second bridge section 10b on the substrate 1, that is, a projection of the black matrix on the substrate 1 covers a projection of the second bridge section 10b on the substrate 1, so as to avoid that the bridge electrode 10 affects the aperture ratio and display effect of the display panel.

[0074] In some embodiments of the present application, the display substrate further comprises an alignment layer, the alignment layer is located on a side of the pixel electrode away from the substrate, and the alignment layer is conformally arranged on the side surface of the pixel electrode and the bridge electrode away from the substrate.

[0075] In the present embodiment, the alignment layer 11 is located on a side of the pixel electrode 9 away from the substrate 1, and after the cell assembly process, the alignment layer 11 is located between the liquid crystal molecules 14 and the pixel electrode 9. The liquid crystal molecules 14 are inclined at a certain angle with the surface of the alignment layer 11, that is, a pre-tilt angle, so as to achieve the effect of uniform alignment. The pre-tilt angle mainly depends on the physical and chemical forces of the alignment layer 11.

[0076] The alignment layer 11 has a parallel alignment direction, that is, the pre-tilt angle between the alignment layer 11 and the liquid crystal molecules 14 is equal, and the long axes of different liquid crystal molecules 14 are parallel to each other. In the present embodiment, due to the action of the annular electric field, the liquid crystal molecules close to the groove hole are subjected to a force from the groove hole to the side away from the groove hole, that is, the long axis direction of the liquid crystal molecules located on at least one side of the groove hole is staggered with the long axis direction of other liquid crystal molecules, and the horizontal component vectors of the long axis directions of the liquid crystal molecules located on the two sides of the groove hole are opposite to each other in the cross-sectional direction perpendicular to the substrate 1.

[0077] In some embodiments of the present application, at least one of the first inorganic layer 5, the organic layer 6, the touch electrode 7 and the second inorganic layer 8 comprises a flat section and a convex section, the side surface of the convex section away from the substrate 1 protrudes from the side surface of the flat section away from the substrate 1, and a projection of the bridge electrode 10 on the substrate covers a projection of the convex section on the substrate.

[0078] In the embodiment, the alignment layer 11 is conformally coated on the surface of the bridge electrode 10, and the alignment layer 11 covers the sidewall and bottom of the bridge electrode 10. The alignment layer 11 includes a flat section and a protruding section, the protruding section protrudes from the surface of the flat section away from the substrate 1, and the protruding section forms a blocking dam to separate the inside and outside of the slot hole, so that the slot hole is relatively closed. After the display substrate and the color film substrate 15 are completed, the distance between the alignment layer 11 and the color film substrate 15 is smaller than the distance between the alignment layer 11 and the color film substrate 15, and the impurity ions 13 between the alignment layer 11 and the color film substrate 15 are at least partially blocked by the blocking dam during movement, preventing or reducing the impurity ions 13 in the liquid crystal from entering the slot hole.

[0079] In another embodiment, the organic layer 6 is conformally coated on the surface of the first inorganic layer 5, the touch electrode 7 is conformally coated on the surface of the organic layer 6, the second inorganic layer 8 is conformally coated on the surface of the touch electrode 7, and the bridge electrode 10 is conformally coated on the surface of the second inorganic layer 8. At least one of the first inorganic layer 5, the organic layer 6, the touch electrode 7, and the second inorganic layer 8 includes a protruding section, and the film layer having the protruding section also has a protruding section away from the substrate 1, such as the bridge electrode 10 and the alignment layer 11. The other film layers close to the substrate 1 can have a protruding section or not. The protruding section of the bridge electrode 10 is referred to as the second bridge section 10b.

[0080] In some embodiments of the present application, the material of the pixel electrode 9 is the same as the material of the bridge electrode 10.

[0081] In the embodiment, the pixel electrode 9 and the bridge electrode 10 are coated or deposited by using the same material in the same process, and then the material is patterned by using different masks to form the pixel electrode 9 and the bridge electrode 10 with different thicknesses.

[0082] Specifically, the first bridge section 10a and the second bridge section 10b with different thicknesses are formed.

[0083] In another embodiment, the material of the pixel electrode 9 is different from the material of the bridge electrode 10, and the pixel electrode 9 and the bridge electrode 10 are prepared in two steps in different processes, which expands the material selection range.

[0084] Optionally, the material of the alignment layer 11 is polyimide, and the material of the pixel electrode 9 and the bridge electrode 10 is indium tin oxide.

[0085] Based on the same inventive concept, in a second aspect, the embodiments of the present application provide a display device, comprising the display substrate in any one of the embodiments of the first aspect. Since the display device comprises the display substrate in any one of the embodiments of the first aspect, the display device has the same beneficial effects as the display substrate, which will not be described here.

[0086] Based on the same inventive concept, in a third aspect, the embodiments of the present application provide a method for manufacturing a display substrate, as shown in Figure 6 Figure 6 FIG. 1 is a flowchart of a method for manufacturing a display substrate according to an embodiment of the present application. The method for manufacturing the display substrate in any one of the embodiments of the first aspect comprises the following steps:

[0087] S1, providing a substrate 1, and manufacturing a touch lead 4 on one side of the substrate 1;

[0088] S2, manufacturing a composite film layer on the side of the touch lead 4 away from the substrate 1, and opening a slot hole in the composite film layer;

[0089] S3, manufacturing a conductive material on the side of the composite film layer away from the touch electrode 7 and in the slot hole, and patterning the conductive material to form a pixel electrode 9 and a bridge electrode 10, respectively, wherein the thickness of the bridge electrode 10 is greater than the thickness of the pixel electrode 9.

[0090] In a specific embodiment, as shown in Figures 7A-7G Figures 7A-7G FIG. 1 is a flowchart of a method for manufacturing a display substrate according to an embodiment of the present application. Step S3 comprises:

[0091] S31, depositing a conductive material 9a on the composite film layer, and depositing a photoresist material 9b on the conductive material 9a; as shown in Figure 7A

[0092] Specifically, 1.6 microns of indium tin oxide is first deposited, and then a photoresist material 9b of a certain thickness is deposited.

[0093] S32, removing the photoresist material 9b in the pixel area by using a first photo mask, and retaining the photoresist material 9b in the non-pixel area; as shown in Figure 7B

[0094] S33, patterning the conductive material 9a in the pixel area; as shown in Figure 7C

[0095] Specifically, the conductive material 9a in the pixel area is thinned.

[0096] S34, manufacturing a photoresist material 9b on the conductive material 9a in the pixel area; as shown in Figure 7D

[0097] ​​​​​​Specifically, the photoresist 9b of the pixel region and the photoresist 9b of the non-pixel region form a step difference.

[0098] S35, patterning the photoresist 9b of the pixel region; as shown in Figure 7E .

[0099] Specifically, the conductive material 9a of the pixel region and the conductive material 9a of the non-pixel region maintain a certain distance.

[0100] S36, patterning the 9a of the pixel region; as shown in Figure 7F .

[0101] Specifically, the conductive material 9a of the pixel region and the conductive material 9a of the non-pixel region maintain a certain distance.

[0102] S37, removing the photoresist 9b of the pixel region to obtain a pixel electrode, and removing the photoresist 9b of the non-pixel region to obtain a bridge electrode 10; as shown in Figure 7G .

[0103] Specifically, the thickness of the bridge electrode 10 is greater than that of the pixel electrode 9.

[0104] The application can at least achieve the following beneficial effects: the bridge electrode 10 is arranged on the side wall and the bottom surface of the slot hole in the composite film layer, the part of the bridge electrode 10 protruding from the pixel electrode 9 forms a blocking dam, which separates the inside and outside of the slot hole, so that the slot hole is relatively closed, preventing or reducing the impurity ions 13 in the liquid crystal from entering the slot hole; at the same time, the structure basis for forming an electric field at the bridge electrode 10 is provided, so that the repulsive force between the bridge electrode 10 and the impurity ions 13 is generated, the electric field drives the impurity ions 13 to move away from the slot hole, further reducing the impurity ions 13 entering the slot hole, avoiding the display panel from appearing vertical black stripes, and improving the display effect and product yield.

[0105] Those skilled in the art can understand that the steps, measures and schemes in the various operations, methods and processes discussed in the present application can be alternated, changed, combined or deleted. Further, other steps, measures and schemes in the various operations, methods and processes discussed in the present application can also be alternated, changed, rearranged, decomposed, combined or deleted. Further, the steps, measures and schemes in the prior art with the various operations, methods and processes disclosed in the present application can also be alternated, changed, rearranged, decomposed, combined or deleted.

[0106] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0107] The terms "first", "second", are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0108] In the description of the present application, it needs to be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0109] In the description of the present application, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0110] It should be understood that although each step in the flowchart of the drawings is shown in sequence according to the direction of the arrow, these steps are not necessarily executed in sequence according to the direction of the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and they can be executed in other order. Moreover, at least part of the steps in the flowchart of the drawings can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or other steps, sub-steps or stages.

[0111] The above is only part of the embodiments of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be regarded as the protection scope of the present application.

Claims

1. A display substrate, comprising a plurality of pixel regions arranged at intervals and a non-pixel region located at a periphery of each of the pixel regions, characterized in that, The display substrate comprises: a substrate; a touch lead wire located on one side of the substrate and having a projection on the substrate at least in the non-pixel area; a composite film layer comprising a touch electrode and located on a side of the touch lead wire away from the substrate, and the composite film layer has a slot hole in the area of the non-pixel area at least penetrating to the touch lead wire; a pixel electrode located on a side of the composite film layer away from the touch lead wire and having a projection on the substrate in the pixel area; a bridge electrode having a projection on the substrate in the non-pixel area and covering at least part of the side wall and at least part of the bottom of the slot hole, and a side of the bridge electrode away from the substrate at least partially protrudes from a surface of a side of the pixel electrode away from the substrate; wherein the touch lead wire is connected to the touch electrode through the bridge electrode; the bridge electrode comprises at least a first bridge segment and a second bridge segment, the second bridge segment covers at least part of the side wall and at least part of the bottom of the slot hole, a side of the second bridge segment away from the substrate protrudes from a surface of a side of the pixel electrode away from the substrate, the second bridge segment is connected to the first bridge segment, and the first bridge segment is connected to the touch electrode; the bridge electrode further comprises a third bridge segment, the first bridge segment and the third bridge segment are respectively located on two sides of the slot hole in a cross-sectional direction perpendicular to the substrate, the first bridge segment located on one side is connected to the third bridge segment located on the other side through the second bridge segment; an included angle between the first bridge segment and a part of the second bridge segment protruding from the pixel electrode is an acute angle, and / or an included angle between the third bridge segment and a part of the second bridge segment protruding from the pixel electrode is an acute angle.

2. The display substrate of claim 1, wherein, a projection on the substrate of the touch lead wire covers a projection on the substrate of the second bridge segment. 3.The display substrate of claim 1 or 2, wherein, the composite film layer further comprises a first inorganic layer, an organic layer and a second inorganic layer, the first inorganic layer, the organic layer, the touch electrode and the second inorganic layer are sequentially stacked from the touch lead wire to a side of the touch lead wire away from the substrate, the second inorganic layer has at least one through hole, the first bridge segment is filled in the through hole and connected to the touch electrode through the through hole.

4. The display substrate of claim 3, wherein, at least one of the first inorganic layer, the organic layer, the touch electrode and the second inorganic layer comprises a flat segment and a protruding segment, a side surface of the protruding segment away from the substrate protrudes from a side surface of the flat segment away from the substrate, and a projection on the substrate of the bridge electrode covers a projection on the substrate of the protruding segment.

5. The display substrate of claim 1, wherein, the display substrate further comprises an alignment layer located on a side of the pixel electrode away from the substrate, and the alignment layer conformally covers a side surface of the pixel electrode and a side surface of the bridge electrode away from the substrate. 6.The display substrate of claim 1, wherein, an opening width in a cross section of the slot hole away from the substrate is greater than an opening width in a cross section close to the substrate.

7. A display device, characterized by comprising: the display substrate comprises any one of claims 1-6.

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