Touch display substrate and manufacturing method therefor, and touch display device

Abstract

Embodiments of the present disclosure relate to the technical field of touch display, and provide a touch display substrate and a manufacturing method therefor, and a touch display device. The touch display substrate comprises a display substrate (10) and a touch function layer located on one side of the display substrate (10); the display substrate (10) is provided with a display region (3) and a peripheral region (4) which are connected to each other; the peripheral region (4) surrounds the display region (3); the display region (3) comprises a first bending region (20) and first flat regions (30) which are connected to each other; a first touch metal layer (40) comprises a plurality of conductive bridges (60); the plurality of conductive bridges (60) are arranged in an array; and the minimum distance between the orthographic projections of the conductive bridges (60) closest to the first bending region (20) among the plurality of conductive bridges (60) on the display substrate (10) and a first bending boundary (1) of the first bending region (20) is greater than 0. The embodiments of the present disclosure can improve the reliability of the touch display substrate.

Description

Touch display substrate and manufacturing method thereof, and touch display device Technical Field

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

[0002] With the continuous development of touch display technology, touch display devices are widely used in the touch display field, such as smart phones, tablet computers, and smart car terminals. Touch display substrates are an important component of touch display devices.

[0003] In the related art, a touch display substrate includes a display substrate and a touch function layer located on one side of the display substrate. The display substrate has a connected curved area and a flat area. The touch function layer includes a first touch metal layer, an insulating layer, and a second touch metal layer stacked in sequence in a direction away from the display substrate. The first touch metal layer includes a plurality of conductive bridges arranged in an array. The orthographic projection of the conductive bridge on the display substrate overlaps with the bending limit of the curved area. The second touch metal layer includes a plurality of first electrode structures, the plurality of first electrode structures are arranged along a first direction, the first electrode structure includes a plurality of first electrodes arranged along a second direction, the first direction and the second direction intersect, and two adjacent first electrodes in the same first electrode structure are respectively connected to a conductive bridge through a via in the insulating layer.

[0004] However, since the orthographic projection of the conductive bridge on the display substrate overlaps with the bending limit, the overlapping part has severe stress concentration, which makes it easy for cracks and black spots to form at the via holes in the insulating layer, affecting the reliability of the touch display substrate.

[0005] Summary of the Invention

[0006] The embodiments of the present disclosure provide a touch display substrate and a manufacturing method thereof, and a touch display device, which can improve the reliability of the touch display substrate. The technical solution is as follows:

[0007] On the one hand, a touch display substrate is provided, comprising a display substrate and a touch function layer located on one side of the display substrate, wherein the display substrate has a connected display area and a peripheral area, the peripheral area surrounds the display area, and the display area includes a connected first curved area and a first flat area; the touch function layer includes a first touch metal layer, an insulating layer, and a second touch metal layer, the first touch metal layer includes a plurality of conductive bridges, the plurality of conductive bridges are arranged in an array, and the minimum distance between the positive projection of the conductive bridge closest to the first curved area on the display substrate and the first curved limit of the first curved area is greater than 0; the second touch metal layer includes a plurality of first electrode structures, the plurality of first electrode structures are arranged along a first direction, the first electrode structure includes a plurality of first electrodes arranged along a second direction, the first direction and the second direction intersect, and two adjacent first electrodes in the same first electrode structure are respectively connected to one of the conductive bridges through a via in the insulating layer.

[0008] Optionally, the first bending limit is the dividing line between the first bending area and the first flat area; or, the first bending limit is the bending line with the smallest curvature radius of the display substrate in the first bending area; or, the first bending limit is the boundary line of the area in the first bending area where the curvature radius of the display substrate is less than 4.5 mm, and the multiple conductive bridges are located outside the area where the curvature radius of the display substrate is less than 4.5 mm.

[0009] Optionally, the display area also includes a second flat area, which is connected to the first curved area, and the second flat area and the first flat area are located on opposite sides of the first curved area; the multiple conductive bridges include multiple first conductive bridges, multiple second conductive bridges and multiple third conductive bridges, the multiple first conductive bridges and the multiple second conductive bridges are all located in the first flat area, and the multiple second conductive bridges are closest to the first curved area, and the multiple third conductive bridges are located in the second flat area, and the distance between the first conductive bridge and the second conductive bridge adjacent to each other in the second direction is smaller than the distance between the second conductive bridge and the third conductive bridge adjacent to each other in the second direction.

[0010] Optionally, orthographic projections of the plurality of conductive bridges on the display substrate are located outside the first bending region.

[0011] Optionally, the distance between two adjacent first conductive bridges in the first direction is equal to the distance between two adjacent third conductive bridges in the first direction, and the distance between two adjacent first conductive bridges in the second direction is equal to the distance between two adjacent third conductive bridges in the second direction.

[0012] Optionally, the sum of the distance between the first conductive bridge and the second conductive bridge adjacent to each other in the second direction and the distance between the second conductive bridge and the third conductive bridge adjacent to each other in the second direction is equal to twice the distance between two first conductive bridges adjacent to each other in the second direction.

[0013] Optionally, the display area also includes a second curved area and a third flat area, the second curved area is connected to the second flat area and the second flat area and the third flat area are located on opposite sides of the second curved area, or the second curved area is connected to the first flat area and the second flat area and the first flat area are located on opposite sides of the second curved area; the multiple conductive bridges also include multiple fourth conductive bridges, the multiple fourth conductive bridges are located in the third flat area, and among the multiple fourth conductive bridges, the distance between two adjacent fourth conductive bridges in the second direction is equal to the distance between two adjacent first conductive bridges in the second direction; the minimum distance between the positive projection of the conductive bridge closest to the second curved area among the multiple conductive bridges on the display substrate and the second curved limit of the second curved area is greater than 0.

[0014] Optionally, the display area also includes a second curved area and a third flat area, the second curved area is connected to the first flat area, and the second flat area and the first flat area are located on opposite sides of the second curved area; the multiple conductive bridges also include a plurality of fourth conductive bridges and a plurality of fifth conductive bridges, the multiple fourth conductive bridges and the multiple fifth conductive bridges are all located in the third flat area, and the multiple fifth conductive bridges are closest to the second curved area, and among the multiple fourth conductive bridges, the distance between two adjacent fourth conductive bridges in the second direction is equal to the distance between two adjacent first conductive bridges in the second direction, and the distance between the fourth conductive bridge and the fifth conductive bridge adjacent in the second direction is less than the distance between the fifth conductive bridge and the first conductive bridge adjacent in the second direction; the minimum distance between the positive projection of the conductive bridge closest to the second curved area among the multiple conductive bridges on the display substrate and the second curved limit of the second curved area is greater than 0.

[0015] Optionally, the first bending area surrounds the first flat area, the first flat area has two first sides, two second sides and four corners, the two first sides are arranged along the second direction, the two second sides are arranged along the first direction, and the corners are located between the adjacent first sides and the second sides and are connected to the first sides and the second sides; the multiple conductive bridges include multiple first conductive bridges and multiple second conductive bridges, the multiple first conductive bridges and the multiple second conductive bridges are all located in the first flat area, and the second conductive bridge is closest to the first bending area at the corner, and the distance between the adjacent second conductive bridges and the first conductive bridge in the first direction is less than the distance between the two adjacent second conductive bridges in the first direction. The distance between the plurality of first conductive bridges is greater than the distance between the first conductive bridges adjacent to each other in the second direction, and the distance between the second conductive bridge and the first conductive bridge adjacent to each other in the second direction is less than the distance between the two first conductive bridges adjacent to each other in the second direction; or, the plurality of first conductive bridges are located in the first flat area, the plurality of second conductive bridges are located in the first curved area, and the second conductive bridges are closest to the corners of the first flat area, the distance between the second conductive bridge and the first conductive bridge adjacent to each other in the first direction is greater than the distance between the two first conductive bridges adjacent to each other in the first direction, and the distance between the second conductive bridge and the first conductive bridge adjacent to each other in the second direction is greater than the distance between the two first conductive bridges adjacent to each other in the second direction.

[0016] Optionally, the multiple conductive bridges also include multiple fifth conductive bridges, the multiple fifth conductive bridges are located in the first flat area, and the multiple fifth conductive bridges are closest to the first bending area at the second side, and the distance between the fifth conductive bridges and the first conductive bridge adjacent in the first direction is less than the distance between two adjacent first conductive bridges in the first direction.

[0017] Optionally, the display area also includes a second bending area, which is connected to the first flat area, and the second bending area and the first bending area are located on opposite sides of the first flat area; the multiple conductive bridges include multiple first conductive bridges, multiple second conductive bridges and multiple fifth conductive bridges, and the multiple first conductive bridges, the multiple second conductive bridges and the multiple fifth conductive bridges are all located in the first flat area, and the multiple second conductive bridges are closest to the first bending area, and the multiple fifth conductive bridges are closest to the second bending area, the distance between the second conductive bridges and the first conductive bridge adjacent in the first direction is smaller than the distance between the two first conductive bridges adjacent in the first direction, and the distance between the fifth conductive bridges and the first conductive bridge adjacent in the first direction is smaller than the distance between the two first conductive bridges adjacent in the first direction; the minimum distance between the positive projection of the conductive bridge closest to the second bending area among the multiple conductive bridges on the display substrate and the second bending limit of the second bending area is greater than 0.

[0018] Optionally, the minimum distance between the orthographic projection of the conductive bridge closest to the first bending area among the multiple conductive bridges on the display substrate and the first bending limit of the first bending area is greater than or equal to a set distance, and the set distance ranges from 0.25 mm to 0.35 mm.

[0019] Optionally, at the via hole in the insulating layer, the width of the conductive bridge is greater than or equal to the width of the first electrode connected to the conductive bridge, and the width is the dimension in a direction parallel to the surface of the display substrate and perpendicular to the second direction.

[0020] Optionally, the display substrate includes a driving backplane, a light-emitting functional layer and an encapsulation layer stacked in sequence in a direction close to the touch functional layer.

[0021] Optionally, the touch display substrate further includes at least one of the following film layers: a barrier layer, the barrier layer being located between the encapsulation layer and the touch function layer; and a protective layer, the protective layer being located on a side of the touch function layer away from the display substrate.

[0022] Optionally, the second touch metal layer also includes multiple second electrode structures, the multiple second electrode structures are arranged along the second direction, the second electrode structure is insulated from the first electrode structure, the second electrode structure includes multiple second electrodes arranged along the first direction and multiple connecting parts, and two adjacent second electrodes in the same second electrode structure are connected through one of the connecting parts.

[0023] Optionally, both the first electrode and the second electrode are mesh structures.

[0024] On the other hand, a method for manufacturing a touch display substrate is provided, comprising: providing a display substrate, the display substrate having a connected display area and a peripheral area, the peripheral area surrounding the display area, the display area including a connected first curved area and a first flat area; forming a touch function layer on one side of the display substrate, the touch function layer including a first touch metal layer, an insulating layer, and a second touch metal layer, the first touch metal layer including a plurality of conductive bridges, the plurality of conductive bridges being arranged in an array, the minimum distance between the orthographic projection of the conductive bridge closest to the first curved area on the display substrate and the first curved limit of the first curved area being greater than 0; the second touch metal layer including a plurality of first electrode structures, the plurality of first electrode structures being arranged along a first direction, the first electrode structure including a plurality of first electrodes arranged along a second direction, the first direction and the second direction intersecting, and two adjacent first electrodes in the same first electrode structure being respectively connected to one of the conductive bridges through a via in the insulating layer.

[0025] In yet another aspect, a touch display device is provided, comprising any one of the aforementioned touch display substrates and a power supply, wherein the touch display substrate is electrically connected to the power supply.

[0026] The technical solutions provided by the embodiments of the present disclosure have the following beneficial effects:

[0027] In the embodiment of the present disclosure, two adjacent first electrodes in the same first electrode structure are respectively connected to a conductive bridge through a via in the insulating layer. The minimum distance between the orthographic projection of the conductive bridge closest to the first bending area among the multiple conductive bridges on the display substrate and the first bending limit of the first bending area is greater than 0, that is, the conductive bridge avoids the first bending limit area with a larger bending amplitude. Therefore, the probability of cracks and black spots forming at the via position in the insulating layer of the conductive bridge due to stress concentration at the first bending limit can be reduced, thereby improving the reliability of the touch display substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] FIG1 is a schematic cross-sectional view of a touch display substrate provided in an embodiment of the present disclosure;

[0030] FIG2 is a schematic diagram of a planar structure of a touch display substrate provided in an embodiment of the present disclosure;

[0031] FIG3 is a schematic structural diagram of a touch display substrate provided by an embodiment of the present disclosure;

[0032] FIG4 is a schematic structural diagram of a dual-folding touch display substrate provided by an embodiment of the present disclosure;

[0033] FIG5 is a schematic structural diagram of another double-folding touch display substrate provided by an embodiment of the present disclosure;

[0034] FIG6 is a schematic structural diagram of a tri-fold touch display substrate provided by an embodiment of the present disclosure;

[0035] FIG7 is a schematic structural diagram of another touch display substrate provided by an embodiment of the present disclosure;

[0036] FIG8 is a schematic structural diagram of another touch display substrate provided by an embodiment of the present disclosure;

[0037] FIG9 is a schematic structural diagram of another touch display substrate provided by an embodiment of the present disclosure;

[0038] FIG10 is a schematic structural diagram of a four-curved touch display substrate provided by an embodiment of the present disclosure;

[0039] FIG11 is a schematic structural diagram of another touch display substrate provided by an embodiment of the present disclosure;

[0040] FIG12 is a schematic structural diagram of another four-curved touch display substrate provided in an embodiment of the present disclosure;

[0041] FIG13 is a schematic structural diagram of another touch display substrate provided by an embodiment of the present disclosure;

[0042] FIG14 is a schematic structural diagram of another touch display substrate provided by an embodiment of the present disclosure;

[0043] FIG15 is a schematic structural diagram of a two-curve touch display substrate provided by an embodiment of the present disclosure;

[0044] FIG16 is a schematic structural diagram of another touch display substrate provided by an embodiment of the present disclosure;

[0045] FIG17 is a schematic cross-sectional view of another touch display substrate provided in an embodiment of the present disclosure;

[0046] FIG18 is a schematic cross-sectional view of another touch display substrate provided in an embodiment of the present disclosure;

[0047] FIG19 is a schematic structural diagram of a display substrate provided by an embodiment of the present disclosure;

[0048] FIG20 is a schematic diagram of a partial structure of a touch display substrate provided in an embodiment of the present disclosure;

[0049] FIG21 is a flow chart of a method for manufacturing a touch display substrate provided in an embodiment of the present disclosure;

[0050] FIG22 is a flow chart of another method for manufacturing a touch display substrate provided by an embodiment of the present disclosure;

[0051] FIG23 is a schematic structural diagram of a touch display device provided in an embodiment of the present disclosure.

[0052] Legend: x, first direction y, second direction 1, first bending limit 2, second bending limit 3, display area 4, peripheral area 1000, touch display substrate 1001, power supply 10, display substrate 11, driving backplane 12, light-emitting functional layer 13, encapsulation layer 20, first bending area 21, second bending area 30, first flat area 31, second flat area 32, third flat area 33, first side 34, second side 35, corner 40, first touch metal layer 41, second touch metal layer 42, first electrode structure 43, first electrode 44, second electrode structure 45, second electrode 46, connecting portion 47, dummy electrode 471, mesh 48, first electrode line 49, second electrode line 50, insulating layer 51, blocking layer 52, protective layer 60, conductive bridge 61, first conductive bridge 62, second conductive bridge 63, third conductive bridge 64, fourth conductive bridge 65, fifth conductive bridge DETAILED DESCRIPTION

[0053] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0054] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the field to which the present disclosure belongs. The terms "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "one" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "include" and similar words mean that the elements or objects appearing before "include" include the elements or objects listed after "include" and their equivalents, and do not exclude other elements or objects. Terms such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", "right", "top", "bottom", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0055] Figure 1 is a schematic cross-sectional view of a touch display substrate provided in an embodiment of the present disclosure. As shown in Figure 1 , the touch display substrate includes a display substrate 10 and a touch function layer located on one side of the display substrate 10. The touch function layer includes a first touch metal layer 40, an insulating layer 50, and a second touch metal layer 41. In the embodiment of the present disclosure, the first touch metal layer 40, the insulating layer 50, and the second touch metal layer 41 are stacked sequentially in a direction away from the display substrate 10. In other embodiments, the first touch metal layer 40, the insulating layer 50, and the second touch metal layer 41 may be stacked sequentially in a direction toward the display substrate 10.

[0056] FIG2 is a schematic diagram of the planar structure of a touch display substrate provided by an embodiment of the present disclosure. FIG1 may be a schematic diagram of the cross-sectional structure at line AA in FIG2 . As shown in FIG1 and FIG2 , the first touch metal layer 40 includes a plurality of conductive bridges 60, and the plurality of conductive bridges 60 are arranged in an array. The second touch metal layer 41 includes a plurality of first electrode structures 42, the plurality of first electrode structures 42 being arranged along a first direction x, and the first electrode structure 42 including a plurality of first electrodes 43 arranged along a second direction y, the first direction x and the second direction y intersecting, and two adjacent first electrodes 43 in the same first electrode structure 42 are respectively connected to a conductive bridge 60 through a via in the insulating layer 50.

[0057] As shown in Figure 2, the second touch metal layer 41 also includes multiple second electrode structures 44, which are arranged along the second direction y. The second electrode structures 44 are insulated from the first electrode structures 42. The second electrode structures 44 include multiple second electrodes 45 arranged along the first direction x and multiple connecting portions 46. Two adjacent second electrodes 44 in the same second electrode structure 44 are connected by a connecting portion 46.

[0058] In the embodiment of the present disclosure, the first electrode 43 may be a driving electrode (TX), and the second electrode 45 may be a sensing electrode (RX). However, the present disclosure is not limited thereto. For example, in other embodiments, the first electrode 43 may be a sensing electrode and the second electrode 45 may be a driving electrode.

[0059] In this way, the specific touch position can be determined by the change in the mutual capacitance at the intersection of the first electrode structure 42 and the second electrode structure 44, so as to realize the touch function.

[0060] As shown in Figure 2, the display substrate 10 has a display area 3 and a peripheral area 4 that are connected. The peripheral area 4 surrounds the display area 3. The display area 3 includes multiple pixels that emit light to form an image on the display side of the display substrate 10. The peripheral area 4 is used for wiring, allowing the touch integrated circuit to send or receive electrical signals from the display area 3 through the wiring. The second touch metal layer 41 also includes multiple first electrode lines 48 and multiple second electrode lines 49. One end of the first electrode line 48 is connected to the upper or lower end of the first electrode structure 42 and is located in the peripheral area 4 at the top, right, and bottom of the display area 3. One end of the second electrode line 49 is connected to the left end of the second electrode structure 44 and is located in the peripheral area 4 at the left and bottom of the display area 3.

[0061] Figure 3 is a schematic diagram of the structure of a touch display substrate provided by an embodiment of the present disclosure. As shown in Figure 3 , the display area 3 includes a first curved area 20 and a first flat area 30 connected to each other. The minimum distance D between the orthographic projection of the conductive bridge 60 closest to the first curved area 20 on the display substrate 10 and the first curved boundary 1 of the first curved area 20 is greater than zero.

[0062] In the embodiment of the present disclosure, the minimum distance D between the orthographic projection of the conductive bridge 60 closest to the first bending area 20 among the multiple conductive bridges 60 on the display substrate 10 and the first bending limit 1 of the first bending area 20 is greater than 0, that is, the conductive bridge 60 avoids the first bending limit 1 area with a larger bending amplitude. Therefore, the probability of the conductive bridge 60 generating cracks and black spots at the via position in the insulating layer 50 due to stress concentration at the first bending limit 1 can be reduced, thereby improving the reliability of the touch display substrate.

[0063] Optionally, the minimum distance D between the orthographic projection of the conductive bridge 60 closest to the first bending region 20 on the display substrate 10 and the first bending limit 1 of the first bending region 20 is greater than or equal to a set distance, and the set distance is in the range of 0.25 mm to 0.35 mm. This ensures that the conductive bridge 60 is farther away from the first bending limit 1.

[0064] For example, the set distance may be 0.25 mm, 0.3 mm, or 0.35 mm, etc.

[0065] For example, the minimum distance D between the orthographic projection of the conductive bridge 60 closest to the first bending region 20 on the display substrate 10 and the first bending limit 1 of the first bending region 20 may be 0.3 mm, 0.35 mm, or 0.4 mm.

[0066] Optionally, the conductive bridge 60 closest to the first bending area 20 among the plurality of conductive bridges 60 is located in the first flat area 30 or the first bending area 20. In this way, the conductive bridge 60 closest to the first bending area 20 is located in an area with a smaller bending amplitude, which can reduce the probability of cracks and black spots.

[0067] Optionally, the first bending limit 1 is the boundary between the first bending region 20 and the first flat region 30, or the first bending limit 1 is the bending line in the first bending region 20 where the display substrate 10 has the smallest curvature radius, or the first bending limit 1 is the boundary of a region in the first bending region 20 where the display substrate 10 has a curvature radius less than 4.5 mm, and the plurality of conductive bridges 60 are located outside the region where the display substrate 10 has a curvature radius less than 4.5 mm. In this way, the first bending limit 1 is located where the display substrate 10 has a smaller curvature radius and a larger bending amplitude, which facilitates the conductive bridges 60 avoiding the region of the first bending limit 1 where the curvature amplitude is larger.

[0068] Since in some embodiments the area of ​​the first bending region 20 is relatively large, and there is a portion of the display substrate 10 in the first bending region 20 with a curvature radius greater than or equal to 4.5 mm, that is, an area with a relatively small bending amplitude, the conductive bridge 60 is located in this portion of the area with a smaller bending amplitude and is less likely to produce cracks and black spots.

[0069] For example, the area in the first curved region 20 where the curvature radius of the display substrate 10 is less than 4.5 mm may include an area in the first curved region 20 where the curvature radius of the display substrate 10 is 4.2 mm, 4.3 mm, or 4.4 mm. This can reduce the probability of cracks and black spots on the conductive bridge 60 due to stress concentration at the bend, while also preventing the electrode patterns of more first electrodes 43 from being affected by the large area of ​​the first curved region 20.

[0070] FIG4 is a schematic diagram of the structure of a dual-folding touch display substrate provided by an embodiment of the present disclosure. The dual-folding touch display substrate can be an outward-bending touch display substrate or an inward-bending touch display substrate. Outward bending refers to bending in which the display side of the display substrate 10 faces the outside of the bending area, and inward bending refers to bending in which the display side of the display substrate 10 faces the inside of the bending area. FIG3 is a schematic diagram of the structure of the touch display substrate shown in FIG4 after it is unfolded. As shown in FIG3 and FIG4, the display area 3 also includes a second flat area 31, which is connected to the first bending area 20, and the second flat area 31 and the first flat area 30 are located on opposite sides of the first bending area 20. The multiple conductive bridges 60 include multiple first conductive bridges 61, multiple second conductive bridges 62, and multiple third conductive bridges 63. The multiple first conductive bridges 61 and the multiple second conductive bridges 62 are all located in the first flat area 30, and the multiple second conductive bridges 62 are closest to the first bending area 20. The multiple third conductive bridges 63 are located in the second flat area 31.

[0071] Optionally, the distance D1 between the first conductive bridge 61 and the second conductive bridge 62 adjacent to each other in the second direction y is smaller than the distance D2 between the second conductive bridge 62 and the third conductive bridge 63 adjacent to each other in the second direction y. In this way, in the double-folding touch display substrate, the second conductive bridge 62 closest to the first bending region 20 can avoid the first bending limit 1 with a larger bending amplitude.

[0072] Optionally, the first direction x and the second direction y are perpendicular to each other.

[0073] Optionally, the orthographic projections of the plurality of conductive bridges 60 on the display substrate 10 are located outside the first curved region 20. That is, the plurality of conductive bridges 60 are all located in a relatively flat region, thereby reducing the probability of cracks and black spots.

[0074] As shown in Figure 3, the distance between two adjacent first conductive bridges 61 in the first direction x is equal to the distance between two adjacent third conductive bridges 63 in the first direction x, both of which are D3. For example, the distance between two adjacent second conductive bridges 62 in the first direction x is also equal to D3. The distance between two adjacent first conductive bridges 61 in the second direction y is equal to the distance between two adjacent third conductive bridges 63 in the second direction y, both of which are D4. In this way, in the dual-folding touch display substrate, the first conductive bridges 61 and the third conductive bridges 63 are arranged at equal distances, which can ensure that the patterns of most of the first electrodes connected by the equally spaced first conductive bridges 61 and the third conductive bridges 63 are the same, and the loop shapes formed are the same, making the capacitance data transmitted by the first electrode structure more uniform.

[0075] Optionally, the sum of the distance D1 between the first conductive bridge 61 and the second conductive bridge 62 adjacent in the second direction y, and the distance D2 between the second conductive bridge 62 and the third conductive bridge 63 adjacent in the second direction y, is equal to twice the distance between two adjacent first conductive bridges 61 in the second direction y. In other words, the sum of D1 and D2 is equal to twice D4. This minimizes the difference in the total size of the patterns of the two first electrodes connected by the second conductive bridge 62 from the patterns of the other first electrodes, making the capacitance data transmitted by the first electrode structure more uniform.

[0076] Figure 5 is a schematic diagram of the structure of another dual-folding touch display substrate provided by an embodiment of the present disclosure. As shown in Figure 5 , the first curved region 20 has a larger area, and the first curved boundary 1 can be the boundary line of the area in the first curved region 20 where the radius of curvature of the display substrate 10 is less than 4.5 mm. In Figure 5 , there are at least two boundaries in the first curved region 20 where the radius of curvature of the display substrate 10 is less than 4.5 mm, and the first curved boundary 1 is the boundary line closest to the first flat region 30.

[0077] Figure 6 is a schematic diagram of the structure of a tri-fold touch display substrate provided in an embodiment of the present disclosure. Figure 7 is a schematic diagram of the structure of another touch display substrate provided in an embodiment of the present disclosure. Figure 7 may be a schematic diagram of the structure of the touch display substrate shown in Figure 6 after it is unfolded. As shown in Figures 6 and 7, the display area 3 also includes a second curved area 21 and a third flat area 32. The second curved area 21 is connected to the first flat area 30, and the second flat area 32 and the first flat area 31 are located on opposite sides of the second curved area 21. The plurality of conductive bridges 60 also includes a plurality of fourth conductive bridges 64, and the plurality of fourth conductive bridges 64 are located in the third flat area 32.

[0078] Optionally, among the multiple fourth conductive bridges 64, the distance between two adjacent fourth conductive bridges 64 in the second direction y is equal to the distance between two adjacent first conductive bridges 61 in the second direction y, both of which are D4, and the minimum distance D' between the positive projection of the conductive bridge 60 closest to the second bending area 21 among the multiple conductive bridges 60 on the display substrate 10 and the second bending limit 2 of the second bending area 21 is greater than 0.

[0079] Optionally, a minimum distance D′ between an orthographic projection of a conductive bridge 60 closest to the second bending region 21 among the plurality of conductive bridges 60 on the display substrate 10 and the second bending limit 2 of the second bending region 21 is greater than or equal to a set distance.

[0080] Exemplarily, the second bending limit 2 is the dividing line between the second bending area 21 and the third flat area 32, or the second bending limit 2 is the bending line in the second bending area 21 where the curvature radius of the display substrate 10 is the smallest, or the second bending limit 2 is the boundary line of the area in the second bending area 21 where the curvature radius of the display substrate 10 is less than 4.5 mm.

[0081] In this way, in the tri-fold touch display substrate, the fourth conductive bridge 64 in the third flat area 32 can avoid the second bending limit 2 with a larger bending amplitude.

[0082] Exemplarily, the distance between two adjacent fourth conductive bridges 64 in the first direction x is equal to the distance between two adjacent first conductive bridges 61 in the first direction x, and both are D3.

[0083] In other embodiments, the second curved area 21 is connected to the second flat area 31 and the second flat area 31 and the third flat area 32 are located on opposite sides of the second curved area 21 . The second curved boundary 2 may be a boundary line between the second curved area 21 and the second flat area 31 .

[0084] Figure 8 is a schematic diagram of the structure of another touch display substrate provided by an embodiment of the present disclosure. Figure 8 may be a schematic diagram of the structure of the touch display substrate shown in Figure 6 after it has been unfolded. As shown in Figure 8, the plurality of conductive bridges 60 further include a plurality of fourth conductive bridges 64 and a plurality of fifth conductive bridges 65. The plurality of fourth conductive bridges 64 and the plurality of fifth conductive bridges 65 are both located in the third flat region 32, with the plurality of fifth conductive bridges 65 being closest to the second curved region 21.

[0085] Optionally, among the plurality of fourth conductive bridges 64, the distance between two adjacent fourth conductive bridges 64 in the second direction y is equal to the distance between two adjacent first conductive bridges 61 in the second direction y, both being D4. The distance D5 between the fourth conductive bridge 64 and the fifth conductive bridge 65 adjacent in the second direction y is less than the distance D6 between the fifth conductive bridge 65 and the first conductive bridge 61 adjacent in the second direction y. Moreover, the minimum distance D' between the orthographic projection of the conductive bridge 60 closest to the second bending region 21 on the display substrate 10 and the second bending limit 2 of the second bending region 21 is greater than zero.

[0086] In this way, in the tri-fold touch display substrate, the second conductive bridge 62 closest to the first bending area 20 and the fifth conductive bridge 65 closest to the second bending area 21 can both avoid the bending limit area with a large bending amplitude.

[0087] FIG9 is a schematic diagram of the structure of another touch display substrate provided in an embodiment of the present disclosure. FIG10 is a schematic diagram of the structure of a four-curved touch display substrate provided in an embodiment of the present disclosure. (a) in FIG10 may be the cross-sectional shape at line BB in FIG9 , and (b) in FIG10 may be the cross-sectional shape at line CC in FIG9 . As shown in FIG9 and FIG10 , the first curved area 20 surrounds the first flat area 30. The first flat area 30 has two first sides 33, two second sides 34, and four corners 35. The two first sides 33 are arranged along the second direction y, the two second sides 34 are arranged along the first direction x, and the corners 35 are located between adjacent first sides 33 and second sides 34 and are connected to the first sides 33 and the second sides 34.

[0088] Optionally, the plurality of conductive bridges 60 include a plurality of first conductive bridges 61 and a plurality of second conductive bridges 62. Both the plurality of first conductive bridges 61 and the plurality of second conductive bridges 62 are located in the first flat region 30, with the second conductive bridges 62 being closest to the first bending region 20 at the corner 35. The distance D7 between adjacent second conductive bridges 62 and first conductive bridges 61 in the first direction x is less than the distance D3 between two adjacent first conductive bridges 61 in the first direction x, and the distance D1 between adjacent second conductive bridges 62 and first conductive bridges 61 in the second direction y is less than the distance D4 between two adjacent first conductive bridges 61 in the second direction y. In this way, in a four-curved touch display substrate, the second conductive bridges 62 closest to the first bending region 20 at the corner 35 can avoid the first bending limit 1, which has a larger bending amplitude.

[0089] FIG11 is a schematic diagram of the structure of another touch display substrate provided in an embodiment of the present disclosure. FIG12 is a schematic diagram of the structure of another four-curve touch display substrate provided in an embodiment of the present disclosure. FIG12 (a) may be the cross-sectional shape at line BB in FIG11, and FIG12 (b) may be the cross-sectional shape at line CC in FIG11. As shown in FIG12, the first bending limit 1 is the bending line with the smallest curvature radius of the display substrate 10 in the first bending area 20, that is, in the first bending area 20 other than the first bending limit 1, the curvature radius of the display substrate 10 is greater than the curvature radius of the display substrate at the first bending limit 1, and the bending amplitude of these areas is smaller. The difference between Figure 11 and Figure 9 is that in Figure 11 , multiple first conductive bridges 61 are located in the first flat region 30, and multiple second conductive bridges 62 are located in the first curved region 20. The second conductive bridges 62 are closest to the corner 35 of the first flat region 30. The distance D7 between adjacent second conductive bridges 62 and first conductive bridges 61 in the first direction x is greater than the distance D3 between two adjacent first conductive bridges 61 in the first direction x. Furthermore, the distance D1 between adjacent second conductive bridges 62 and first conductive bridges 61 in the second direction y is greater than the distance D4 between two adjacent first conductive bridges 61 in the second direction y. In this way, in a four-curved touch display substrate, the second conductive bridge 62 closest to the first curved region 20 at the corner 35 can be located in the first curved region 20 with a smaller curvature, thereby avoiding the first curved boundary 1 with a larger curvature.

[0090] FIG13 is a schematic diagram of the structure of another touch display substrate provided in an embodiment of the present disclosure. FIG14 is a schematic diagram of the structure of another touch display substrate provided in an embodiment of the present disclosure. The difference between FIG13 and FIG9 and the difference between FIG14 and FIG11 is that the multiple conductive bridges 60 in FIG13 and FIG14 also include multiple fifth conductive bridges 65. The multiple fifth conductive bridges 65 are located in the first flat area 30, and the multiple fifth conductive bridges 65 are closest to the first bending area 20 at the second side 34. The distance D8 between adjacent fifth conductive bridges 65 and first conductive bridges 61 in the first direction x is less than the distance D3 between two adjacent first conductive bridges 61 in the first direction x. In this way, in the four-curve touch display substrate, the second conductive bridge 62 closest to the first bending area 20 at the corner 35 and the fifth conductive bridge 65 closest to the second side 34 can avoid the first bending limit 1 with a larger bending amplitude.

[0091] Figure 15 is a schematic diagram of the structure of a two-curved touch display substrate provided in an embodiment of the present disclosure. Figure 16 is a schematic diagram of the structure of another touch display substrate provided in an embodiment of the present disclosure. Figure 16 may be a cross-sectional view taken along line BB in Figure 15 . As shown in Figures 15 and 16 , the display area 3 also includes a second curved area 21, which is connected to the first flat area 30, and the second curved area 21 and the first curved area 20 are located on opposite sides of the first flat area 30.

[0092] Optionally, the plurality of conductive bridges 60 includes a plurality of first conductive bridges 61, a plurality of second conductive bridges 62, and a plurality of fifth conductive bridges 65. The plurality of first conductive bridges 61, the plurality of second conductive bridges 62, and the plurality of fifth conductive bridges 65 are all located in the first flat region 30, with the plurality of second conductive bridges 62 being closest to the first bending region 20, and the plurality of fifth conductive bridges 65 being closest to the second bending region 21. A distance D7 between adjacent second conductive bridges 62 and first conductive bridges 61 in the first direction x is smaller than a distance D3 between two adjacent first conductive bridges 61 in the first direction x, a distance D8 between adjacent fifth conductive bridges 65 and first conductive bridges 61 in the first direction x is smaller than a distance D3 between two adjacent first conductive bridges 61 in the first direction x, and a minimum distance D' between an orthographic projection of the conductive bridge 60 closest to the second bending region 21 on the display substrate 10 and the second bending limit 2 of the second bending region 21 is greater than zero.

[0093] In this way, in the dual-curve touch display substrate, the second conductive bridge 62 closest to the first bending area 20 and the fifth conductive bridge 65 closest to the second bending area 21 can avoid the bending limit area with a large bending amplitude.

[0094] Figure 17 is a schematic cross-sectional view of another touch display substrate provided in an embodiment of the present disclosure. Figure 17 may be a schematic cross-sectional view taken along line EE in Figure 2 . As shown in Figure 17 , at the via hole in the insulating layer 50 , the width W1 of the conductive bridge 60 is equal to the width W2 of the first electrode 43 connected to the conductive bridge 60 .

[0095] Figure 18 is a schematic cross-sectional view of another touch display substrate provided by an embodiment of the present disclosure. The difference between Figure 18 and Figure 17 is that in Figure 18 , at the via hole in the insulating layer 50 , the width W1 of the conductive bridge 60 is greater than the width W2 of the first electrode 43 connected to the conductive bridge 60 .

[0096] It should be noted that the widths W1 and W2 are both dimensions in a direction parallel to the surface of the display substrate 10 and perpendicular to the second direction y. In this way, the width of the conductive bridge 60 is larger at the via hole in the insulating layer 50, which can reduce the impedance of the conductive bridge 60.

[0097] Optionally, the touch display substrate further includes a barrier layer 51, which is located on a side of the touch function layer close to the display substrate 10. The barrier layer 51 can be used to block impurity ions and the like from entering the touch function layer.

[0098] Optionally, the touch display substrate further includes a protective layer 52, which is located on the side of the touch function layer away from the display substrate 10. The protective layer 52 is used to protect the touch metal layer from external damage and also has a planarizing effect, making the surface of the touch function layer away from the display substrate 10 relatively flat.

[0099] Illustratively, the first touch metal layer 40, the insulating layer 50 and the second touch metal layer 41 are stacked sequentially in a direction away from the display substrate 10, the barrier layer 51 is located between the display substrate 10 and the first touch metal layer 40, and the protective layer 52 is located on the side of the second touch metal layer 41 away from the display substrate 10.

[0100] In other embodiments, the first touch metal layer 40, the insulating layer 50, and the second touch metal layer 41 are stacked sequentially in a direction close to the display substrate 10, the barrier layer 51 is located between the display substrate 10 and the second touch metal layer 42, and the protective layer 52 is located on a side of the first touch metal layer 40 away from the display substrate 10.

[0101] Optionally, the material of the barrier layer 51 is an organic material or an inorganic material.

[0102] For example, the barrier layer 51 may be a polyimide (PI) layer, a silicon nitride layer, a silicon oxide layer, or the like.

[0103] Optionally, the material of the protection layer 52 is an organic material or an inorganic material.

[0104] For example, the protective layer 52 may be a PI layer, a silicon nitride layer, a silicon oxide layer, or the like.

[0105] Optionally, the insulating layer 50 is made of an organic material. For example, the insulating layer can be a PI layer. Organic materials have good bendability and can reduce the probability of cracks and black spots caused by large bending amplitudes.

[0106] In other embodiments, the insulating layer 50 may also be made of an inorganic material, such as a silicon nitride layer or a silicon oxide layer.

[0107] Optionally, the material of the first touch metal layer 40 includes a Ti layer, an Al layer, and a Ti layer stacked in sequence, or includes an indium tin oxide (ITO) layer, an Ag layer, and an ITO layer stacked in sequence.

[0108] Optionally, the material of the second touch metal layer 41 includes a Ti layer, an Al layer, and a Ti layer stacked in sequence, or includes an ITO layer, an Ag layer, and an ITO layer stacked in sequence.

[0109] Optionally, the display substrate 10 can be an organic light-emitting diode (OLED) display substrate, a quantum dot light-emitting diode (QLED) display substrate, a micro light-emitting diode (Micro LED) display substrate or a liquid crystal (LC) display substrate, etc.

[0110] The following description will be made by taking an OLED display substrate as an example.

[0111] Figure 19 is a schematic structural diagram of a display substrate provided by an embodiment of the present disclosure. As shown in Figure 19, the display substrate 10 includes a driving backplane 11, a light-emitting functional layer 12 and an encapsulation layer 13 stacked in sequence in a direction close to the touch functional layer. Combined with Figures 18 and 19, that is, the barrier layer 51 is located between the encapsulation layer 13 and the touch functional layer, so that the touch display substrate is an FMLOC (Flexible Multiple Layer on Cell, flexible multi-layer structure), which can reduce the thickness of the touch display substrate and is conducive to the lightweight design of the touch display substrate. The encapsulation layer 13 can encapsulate the driving backplane 11 and the light-emitting functional layer 12, isolate external water vapor, reduce the probability of oxidation of the driving backplane 11 and the light-emitting functional layer 12 due to water vapor, and improve the reliability of the touch display substrate.

[0112] Optionally, the driving backplane 11 may include a base substrate and a driving circuit layer stacked in sequence in a direction close to the touch function layer. The driving backplane may be a low-temperature polycrystalline silicon oxide (LTPO) backplane or a low-temperature polycrystalline silicon (LTPS) backplane.

[0113] Optionally, the driving circuit layer includes a plurality of thin film transistors (TFTs).

[0114] Taking the LTPO backplane as an example, multiple TFTs include low-temperature polysilicon TFTs and metal oxide TFTs.

[0115] Optionally, the driving circuit layer also includes a bottom light-shielding layer, a buffer layer, a first active layer, a first gate insulating layer, a first gate layer, a first insulating layer, a second gate layer, a second gate insulating layer, a second active layer, a third gate insulating layer, a third gate layer, an interlayer dielectric layer, a first source and drain layer, a passivation layer, a first planarization layer, a second source and drain layer, and a second planarization layer, which are stacked in sequence along the direction close to the touch function layer.

[0116] Optionally, the light-emitting functional layer 12 includes an anode layer, a pixel definition layer, a light-emitting layer, and a cathode layer stacked in sequence in a direction close to the touch functional layer.

[0117] Illustratively, the anode layer may be made of a metal material, such as gold, or the anode layer may be made of a transparent conductive material, such as ITO.

[0118] Exemplarily, the material for making the pixel definition layer includes one or more of PI, polyimide, polyphthalamide, silicon oxide, silicon nitride, etc.

[0119] For example, the light-emitting layer may include a hole transport layer (HTL), a hole injection layer (HIL), an electron transport layer (ETL), an electron injection layer (EIL), a hole blocking layer (HBL), an electron blocking layer (EBL) and a light-emitting material layer.

[0120] Illustratively, the cathode layer may be made of a metal material such as magnesium-silver alloy, or a transparent conductive material such as ITO.

[0121] Optionally, the encapsulation layer 13 includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in sequence in a direction close to the touch function layer.

[0122] Figure 20 is a schematic diagram of a partial structure of a touch display substrate provided by an embodiment of the present disclosure. As shown in Figure 20, both the first electrode 43 and the second electrode 45 have a mesh structure. This reduces the risk of cracks forming at the edges of the first electrode 43 and the second electrode 45 when the touch display substrate is bent.

[0123] As shown in Figure 20, the mesh structure has multiple meshes 471. The second touch metal layer 41 also includes multiple dummy electrodes (DUMMY) 47. The dummy electrodes 47 are located in the meshes 471 of the mesh-shaped first electrodes 43 and the meshes 471 of the mesh-shaped second electrodes 45. The dummy electrodes 47 are insulated from both the first electrodes 43 and the second electrodes 45. The dummy electrodes 47 can fill the touch display substrate, making the thickness of the touch display substrate more uniform and the physical structure more stable. They can also be used to increase the transparency of the touch display substrate or improve touch performance.

[0124] Exemplarily, the virtual electrode 47 is a mesh structure.

[0125] FIG21 is a flow chart of a method for manufacturing a touch display substrate according to an embodiment of the present disclosure. As shown in FIG21 , the manufacturing method includes:

[0126] In step S701 , a display substrate is provided.

[0127] The display substrate has a display area and a peripheral area connected to each other. The peripheral area surrounds the display area. The display area includes a first curved area and a first flat area connected to each other.

[0128] In step S702 , a touch function layer is formed on one side of the display substrate.

[0129] Among them, the touch function layer includes a first touch metal layer, an insulating layer and a second touch metal layer, the first touch metal layer includes multiple conductive bridges, the multiple conductive bridges are arranged in an array, and the minimum distance between the positive projection of the conductive bridge closest to the first bending area on the display substrate and the first bending limit of the first bending area is greater than 0; the second touch metal layer includes multiple first electrode structures, the multiple first electrode structures are arranged along a first direction, the first electrode structure includes multiple first electrodes arranged along a second direction, the first direction and the second direction intersect, and two adjacent first electrodes in the same first electrode structure are respectively connected to a conductive bridge through a via in the insulating layer.

[0130] The beneficial effects of the embodiments of the present disclosure can be seen from the relevant embodiments of Figures 1 to 4, which will not be described again here.

[0131] FIG22 is a flow chart of another method for manufacturing a touch display substrate provided by an embodiment of the present disclosure. As shown in FIG22 , the manufacturing method includes:

[0132] In step S801 , a display substrate is provided.

[0133] The display substrate has a display area and a peripheral area connected to each other. The peripheral area surrounds the display area. The display area includes a first curved area and a first flat area connected to each other.

[0134] In step S802 , a barrier layer is formed on the display substrate.

[0135] In step S803 , a first touch metal layer is formed on the barrier layer.

[0136] For example, a first metal layer can be formed on the barrier layer by deposition, for example. A photoresist structure is obtained on the first metal layer by processes such as photoresist coating, exposure, and development. The first metal layer is etched using the photoresist structure as a mask to form a first touch metal layer.

[0137] The first touch metal layer includes a plurality of conductive bridges arranged in an array, and the minimum distance between the orthographic projection of the conductive bridge closest to the first bending area on the display substrate and the first bending limit of the first bending area is greater than 0.

[0138] In step S804 , an insulating layer is formed on the first touch metal layer.

[0139] For example, an initial insulating layer may be formed on the first touch metal layer by deposition, and a photoresist structure may be obtained by photoresist coating, exposure, and development on the initial insulating layer.

[0140] In step S805 , a second touch metal layer is formed on the insulating layer.

[0141] For example, a second metal layer can be formed on the insulating layer by deposition, for example, and a photoresist structure is obtained on the second metal layer by processes such as photoresist coating, exposure, and development. The second metal layer is etched using the photoresist structure as a mask to form a second touch metal layer.

[0142] Among them, the second touch metal layer includes multiple first electrode structures, the multiple first electrode structures are arranged along the first direction, the first electrode structure includes multiple first electrodes arranged along the second direction, the first direction and the second direction intersect, and two adjacent first electrodes in the same first electrode structure are respectively connected to a conductive bridge through vias in the insulating layer.

[0143] Optionally, the second touch metal layer further includes a plurality of second electrode structures, a plurality of first electrode lines, a plurality of second electrode lines and a plurality of dummy electrodes.

[0144] In step S806 , a protection layer is formed on the second touch metal layer.

[0145] Optionally, the position of the conductive bridge, the structure, shape, positional relationship and material of each layer, etc. refer to the relevant embodiments of Figures 1 to 20, and detailed description is omitted here.

[0146] FIG23 is a schematic diagram of the structure of a touch display device provided by an embodiment of the present disclosure. As shown in FIG23 , the touch display device includes the aforementioned touch display substrate 1000 and a power supply 1001 , and the touch display substrate 1000 is electrically connected to the power supply 1001 .

[0147] Optionally, the touch display device can be any product or component with a touch display function, such as a smart phone, a tablet computer, or a smart vehicle-mounted terminal.

[0148] The above description does not limit the present disclosure in any form. Although the present disclosure has been disclosed as above through the embodiments, it is not intended to limit the present disclosure. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments with equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present disclosure. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present disclosure without departing from the content of the technical solution of the present disclosure are still within the scope of the technical solution of the present disclosure.

Claims

1. A touch display substrate, characterized in that: It comprises a display substrate (10) and a touch function layer located on one side of the display substrate (10), The display substrate (10) has a connected display area (3) and a peripheral area (4), the peripheral area (4) surrounds the display area (3), and the display area (3) includes a connected first curved area (20) and a first flat area (30); The touch function layer comprises a first touch metal layer (40), an insulating layer (50) and a second touch metal layer (41), The first touch metal layer (40) comprises a plurality of conductive bridges (60), the plurality of conductive bridges (60) being arranged in an array, and the minimum distance between the orthographic projection of the conductive bridge (60) closest to the first bending area (20) among the plurality of conductive bridges (60) on the display substrate (10) and the first bending limit (1) of the first bending area (20) being greater than 0; The second touch metal layer (41) includes a plurality of first electrode structures (42), wherein the plurality of first electrode structures (42) are arranged along a first direction, and the first electrode structure (42) includes a plurality of first electrodes (43) arranged along a second direction, wherein the first direction and the second direction intersect, and two adjacent first electrodes (43) in the same first electrode structure (42) are respectively connected to one of the conductive bridges (60) through a via hole in the insulating layer (50).

2. The touch display substrate according to claim 1, wherein: The first bending limit (1) is a boundary line between the first bending area (20) and the first flat area (30); Alternatively, the first bending limit (1) is a bending line with the smallest curvature radius of the display substrate (10) in the first bending area (20); Alternatively, the first bending limit (1) is a boundary line of an area in the first bending zone (20) where the radius of curvature of the display substrate (10) is less than 4.5 mm, and the plurality of conductive bridges (60) are located outside the area where the radius of curvature of the display substrate (10) is less than 4.5 mm.

3. The touch display substrate according to claim 1 or 2, characterized in that: The display area (3) further includes a second flat area (31), the second flat area (31) is connected to the first curved area (20), and the second flat area (31) and the first flat area (30) are located on opposite sides of the first curved area (20); The plurality of conductive bridges (60) include a plurality of first conductive bridges (61), a plurality of second conductive bridges (62) and a plurality of third conductive bridges (63); the plurality of first conductive bridges (61) and the plurality of second conductive bridges (62) are both located in the first flat area (30), and the plurality of second conductive bridges (62) are closest to the first curved area (20); the plurality of third conductive bridges (63) are located in the second flat area (31); and the distance between the first conductive bridge (61) and the second conductive bridge (62) adjacent to each other in the second direction is smaller than the distance between the second conductive bridge (62) and the third conductive bridge (63) adjacent to each other in the second direction.

4. The touch display substrate according to claim 3, wherein: The orthographic projections of the plurality of conductive bridges (60) on the display substrate (10) are located outside the first bending area (20).

5. The touch display substrate according to claim 4, wherein: The distance between two adjacent first conductive bridges (61) in the first direction is equal to the distance between two adjacent third conductive bridges (63) in the first direction, and the distance between two adjacent first conductive bridges (61) in the second direction is equal to the distance between two adjacent third conductive bridges (63) in the second direction.

6. The touch display substrate according to claim 5, wherein: The sum of the distance between the first conductive bridge (61) and the second conductive bridge (62) adjacent to each other in the second direction and the distance between the second conductive bridge (62) and the third conductive bridge (63) adjacent to each other in the second direction is equal to twice the distance between two first conductive bridges (61) adjacent to each other in the second direction.

7. The touch display substrate according to any one of claims 4 to 6, characterized in that: The display area (3) further includes a second curved area (21) and a third flat area (32). The second curved area (21) is connected to the second flat area (31), and the second flat area (31) and the third flat area (32) are located on opposite sides of the second curved area (21); or the second curved area (21) is connected to the first flat area (30), and the second flat area (31) and the first flat area (30) are located on opposite sides of the second curved area (21); The plurality of conductive bridges (60) further include a plurality of fourth conductive bridges (64), the plurality of fourth conductive bridges (64) being located in the third flat region (32), and the plurality of fourth conductive bridges (64) being located in the second flat region (32). The distance between two adjacent fourth conductive bridges (64) in the direction is equal to the distance between two adjacent first conductive bridges (61) in the second direction; The minimum distance between the orthographic projection of the conductive bridge (60) closest to the second bending area (21) among the plurality of conductive bridges (60) on the display substrate (10) and the second bending limit (2) of the second bending area (21) is greater than 0.

8. The touch display substrate according to any one of claims 4 to 6, characterized in that: The display area (3) further comprises a second curved area (21) and a third flat area (32), wherein the second curved area (21) is connected to the first flat area (30), and the second flat area (31) and the first flat area (30) are located on opposite sides of the second curved area (21); The plurality of conductive bridges (60) further include a plurality of fourth conductive bridges (64) and a plurality of fifth conductive bridges (65), the plurality of fourth conductive bridges (64) and the plurality of fifth conductive bridges (65) are both located in the third flat area (32), and the plurality of fifth conductive bridges (65) are closest to the second curved area (21), and among the plurality of fourth conductive bridges (64), the distance between two adjacent fourth conductive bridges (64) in the second direction is equal to the distance between two adjacent first conductive bridges (61) in the second direction, and the distance between the fourth conductive bridge (64) and the fifth conductive bridge (65) adjacent in the second direction is smaller than the distance between the fifth conductive bridge (65) and the first conductive bridge (61) adjacent in the second direction; The minimum distance between the orthographic projection of the conductive bridge (60) closest to the second bending area (21) among the plurality of conductive bridges (60) on the display substrate (10) and the second bending limit (2) of the second bending area (21) is greater than 0.

9. The touch display substrate according to claim 1 or 2, characterized in that: The first curved area (20) surrounds the first flat area (30), and the first flat area (30) has two first sides (33), two second sides (34), and four corners (35), wherein the two first sides (33) are arranged along the second direction, the two second sides (34) are arranged along the first direction, and the corners (35) are located between adjacent first sides (33) and second sides (34) and are connected to the first sides (33) and the second sides (34); The plurality of conductive bridges (60) include a plurality of first conductive bridges (61) and a plurality of second conductive bridges (62), the plurality of first conductive bridges (61) and the plurality of second conductive bridges (62) are both located in the first flat area (30), and the second conductive bridges (62) are closest to the first curved area (20) at the corner (35). The distance between the second conductive bridge (62) and the first conductive bridge (61) adjacent to each other in the first direction is smaller than the distance between two first conductive bridges (61) adjacent to each other in the first direction, and the distance between the second conductive bridge (62) and the first conductive bridge (61) adjacent to each other in the second direction is smaller than the distance between two first conductive bridges (61) adjacent to each other in the second direction; Alternatively, the plurality of first conductive bridges (61) are located in the first flat area (30), the plurality of second conductive bridges (62) are located in the first curved area (20), and the second conductive bridges (62) are closest to the corner (35) of the first flat area (30), the distance between the second conductive bridges (62) and the first conductive bridge (61) adjacent to each other in the first direction is greater than the distance between two first conductive bridges (61) adjacent to each other in the first direction, and the distance between the second conductive bridges (62) and the first conductive bridge (61) adjacent to each other in the second direction is greater than the distance between two first conductive bridges (61) adjacent to each other in the second direction.

10. The touch display substrate according to claim 9, wherein: The plurality of conductive bridges (60) further include a plurality of fifth conductive bridges (65), the plurality of fifth conductive bridges (65) being located in the first flat area (30), and the plurality of fifth conductive bridges (65) being closest to the first curved area (20) at the second side (34), and the distance between the fifth conductive bridges (65) and the first conductive bridge (61) adjacent to each other in the first direction is smaller than the distance between two first conductive bridges (61) adjacent to each other in the first direction.

11. The touch display substrate according to claim 1 or 2, characterized in that: The display area (3) further includes a second curved area (21), the second curved area (21) is connected to the first flat area (30), and the second curved area (21) and the first curved area (20) are located on opposite sides of the first flat area (30); The plurality of conductive bridges (60) include a plurality of first conductive bridges (61), a plurality of second conductive bridges (62) and a plurality of fifth conductive bridges (65); the plurality of first conductive bridges (61), the plurality of second conductive bridges (62) and the plurality of fifth conductive bridges (65) are all located in the first flat area (30), and the plurality of second conductive bridges (62) are closest to the first bending area (20), and the plurality of fifth conductive bridges (65) are closest to the second bending area (21); the distance between the second conductive bridges (62) and the first conductive bridge (61) adjacent to each other in the first direction is smaller than the distance between two first conductive bridges (61) adjacent to each other in the first direction; and the distance between the fifth conductive bridges (65) and the first conductive bridge (61) adjacent to each other in the first direction is smaller than the distance between two first conductive bridges (61) adjacent to each other in the first direction. Leave; The minimum distance between the orthographic projection of the conductive bridge (60) closest to the second bending area (21) among the plurality of conductive bridges (60) on the display substrate (10) and the second bending limit (2) of the second bending area (21) is greater than 0.

12. The touch display substrate according to any one of claims 1 to 2, claims 4 to 6 and claim 10, characterized in that: The minimum distance between the orthographic projection of the conductive bridge (60) closest to the first bending area (20) among the multiple conductive bridges (60) on the display substrate (10) and the first bending limit (1) of the first bending area (20) is greater than or equal to a set distance, and the set distance has a value range of 0.25 mm to 0.35 mm.

13. The touch display substrate according to any one of claims 1 to 2, claims 4 to 6 and claim 10, characterized in that: At the via hole in the insulating layer (50), the width of the conductive bridge (60) is greater than or equal to the width of the first electrode (43) correspondingly connected to the conductive bridge (60), and the width is a dimension in a direction parallel to the surface of the display substrate (10) and perpendicular to the second direction.

14. The touch display substrate according to any one of claims 1 to 2, claims 4 to 6 and claim 10, characterized in that: The display substrate (10) comprises a driving backplane (11), a light-emitting functional layer (12), and an encapsulation layer (13) which are sequentially stacked in a direction close to the touch functional layer.

15. The touch display substrate according to claim 14, wherein: The touch display substrate further includes at least one of the following film layers: a barrier layer (51), the barrier layer (51) being located between the encapsulation layer (13) and the touch function layer; A protective layer (52), the protective layer (52) being located on a side of the touch function layer away from the display substrate (10).

16. The touch display substrate according to any one of claims 1 to 2, claims 4 to 6, claim 10 and claim 15, characterized in that: The second touch metal layer (41) further includes a plurality of second electrode structures (44), the plurality of second electrode structures (44) are arranged along the second direction, the second electrode structure (44) and the first electrode structure (42) are insulated, the second electrode structure (44) includes a plurality of second electrodes (44) arranged along the first direction and a plurality of connecting portions (46), and two adjacent second electrodes (44) in the same second electrode structure (44) are connected via one of the connecting portions (46).

17. The touch display substrate according to claim 16, wherein: The first electrode (43) and the second electrode (45) both have a mesh structure.

18. A method for manufacturing a touch display substrate, characterized in that: include: A display substrate (10) is provided, wherein the display substrate (10) has a display area (3) and a peripheral area (4) connected to each other, wherein the peripheral area (4) surrounds the display area (3), and the display area (3) includes a first curved area (20) and a first flat area (30) connected to each other; A touch function layer is formed on one side of the display substrate (10), the touch function layer comprising a first touch metal layer (40), an insulating layer (50) and a second touch metal layer (41), the first touch metal layer (40) comprising a plurality of conductive bridges (60), the plurality of conductive bridges (60) being arranged in an array, the minimum distance between the orthographic projection of the conductive bridge (60) closest to the first bending area (20) on the display substrate (10) and the first bending limit (1) of the first bending area (20) being greater than 0; the second touch metal layer (41) comprising a plurality of first electrode structures (42), the plurality of first electrode structures (42) being arranged along a first direction, the first electrode structure (42) comprising a plurality of first electrodes (43) arranged along a second direction, the first direction and the second direction intersecting, and two adjacent first electrodes (43) in the same first electrode structure (42) being connected to one of the conductive bridges (60) through a via hole in the insulating layer (50).

19. A touch display device, characterized in that: The device comprises a touch display substrate (1000) according to any one of claims 1 to 17 and a power supply (1001), wherein the touch display substrate (1000) is electrically connected to the power supply (1001).

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