Touch display panel and display device

Abstract

The present disclosure provides a touch display panel and a display device. The touch display panel comprises: a base substrate, comprising a display area and a peripheral area, wherein the peripheral area comprises a first peripheral area; a plurality of retaining walls located in the peripheral area, wherein the orthographic projections of the retaining walls on the base substrate surround the display area; each retaining wall comprises a first area and a second area; portions of the first area and the second area are located in the first peripheral area; in the first peripheral area, each second area comprises portions located on the two opposite sides of the corresponding first area in a second direction; and in a direction perpendicular to the base substrate, the thicknesses of at least some first areas are smaller than those of the corresponding second areas; and a plurality of touch signal lines at least located in the first peripheral area, wherein in the first peripheral area, the orthographic projections of at least some touch signal lines among the plurality of touch signal lines overlap the orthographic projections of the first areas, each having a smaller thickness than the corresponding second area, on the base substrate, and the orthographic projections of the plurality of touch signal lines on the base substrate do not overlap the orthographic projections of the second areas of the retaining walls on the base substrate.

Description

Touch display panel and display device Technical Field

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

[0002] Organic light-emitting diode display panels require retaining walls to prevent the organic encapsulation layer from overflowing, and the thickness of the retaining walls at the corners needs to be greater than the thickness at the straight edges to prevent the organic encapsulation layer from overflowing at the corners. For touch display panels using Flexible Multi-Layer On Cell (FMLOC) technology, the touch layer is set on the encapsulation layer, and the touch signal lines extending upward from the binding area need to cross the retaining walls. If the retaining walls are too thick, the touch signal lines will break at the point where they cross the retaining walls, and the touch signal cannot be transmitted at the break, affecting the yield of the touch display panel.

[0003] Summary of the Invention

[0004] An embodiment of the present disclosure provides a touch display panel, the touch display panel comprising:

[0005] The base substrate includes a display area and a peripheral area surrounding the display area; the peripheral area includes a first peripheral area located on one side of the display area in a first direction;

[0006] A plurality of retaining walls are located in the peripheral area; the orthographic projections of the retaining walls on the base substrate surround the display area; at least one retaining wall includes: a first area and a second area; portions of the first area and the second area are located in the first peripheral area; and in the first peripheral area, the second area includes portions located on opposite sides of the first area in a second direction; the first direction is perpendicular to the second direction; and in a direction perpendicular to the base substrate, a thickness of at least a portion of the first area is less than a thickness of the second area.

[0007] A plurality of touch signal lines are located at least in the first peripheral area and on a side of the retaining wall away from the base substrate; in the first peripheral area, the orthographic projections of at least some of the plurality of touch signal lines on the base substrate overlap with the orthographic projections of the first area having a thickness less than that of the second area on the base substrate, and the orthographic projections of the plurality of touch signal lines on the base substrate do not overlap with the orthographic projections of the second area of ​​the retaining wall on the base substrate.

[0008] In some embodiments, the first region extends along the second direction, and the second region has a corner; in a direction perpendicular to the substrate, a thickness of the first region is less than a thickness of the second region;

[0009] The orthographic projections of the plurality of touch signal lines on the base substrate overlap with the orthographic projection of the first region on the base substrate.

[0010] In some embodiments, an extension direction of at least a portion of the touch signal line intersects with an extension direction of the first region;

[0011] The distance between the orthographic projection of the touch signal line closest to the second area on the base substrate and the orthographic projection of the second area on the base substrate is greater than or equal to 3 micrometers.

[0012] In some embodiments, a distance between an orthographic projection of the touch signal line closest to the second region on the base substrate and an orthographic projection of the second region on the base substrate is greater than or equal to 20 micrometers and less than or equal to 100 micrometers.

[0013] In some embodiments, the touch display panel further includes: a multi-layer insulation layer located between the touch signal line and the base substrate;

[0014] The retaining wall includes a plurality of sub-layers arranged in a stacked manner, and at least some of the sub-layers are arranged on the same layer as the insulating layer;

[0015] The second region includes a larger number of sub-layers than the first region.

[0016] In some embodiments, the plurality of retaining walls include: a first retaining wall, and a second retaining wall located on a side of the first retaining wall away from the display area;

[0017] In the first peripheral area, the boundary between the first area and the second area in the second retaining wall is closer to the symmetry axis of the touch display panel parallel to the first direction than the boundary between the first area and the second area in the first retaining wall.

[0018] In some embodiments, the first region extends along the second direction, and the second region has a corner;

[0019] The first region includes: a plurality of first sub-regions and a plurality of second sub-regions; in the second direction, the first sub-regions and the second sub-regions are alternately arranged; in a direction perpendicular to the substrate, the thickness of the first sub-region is smaller than the thickness of the second sub-region, and the thickness of the first sub-region is smaller than the thickness of the second region;

[0020] The orthographic projection of the touch signal line on the base substrate overlaps with the orthographic projection of the first sub-region on the base substrate, and the orthographic projection of the touch signal line on the base substrate does not overlap with the orthographic projection of the second sub-region on the base substrate.

[0021] In some embodiments, a portion of the first sub-region corresponds to a touch signal line.

[0022] In some embodiments, a distance between an orthographic projection of a boundary between the first sub-region and the second sub-region on the substrate and an edge of the orthographic projection of the touch signal line closest to the boundary on the substrate is greater than or equal to 3 micrometers and less than or equal to 5 micrometers;

[0023] And / or, the distance between the orthographic projection of the boundary between the first sub-region and the second region on the substrate and the edge of the orthographic projection of the touch signal line closest to the boundary on the substrate is greater than or equal to 3 micrometers and less than or equal to 5 micrometers.

[0024] In some embodiments, in each barrier wall, a thickness of the second sub-region in a direction perpendicular to the substrate is equal to a thickness of the second region in a direction perpendicular to the substrate.

[0025] In some embodiments, the touch display panel further includes: a multi-layer insulation layer located between the touch signal line and the base substrate;

[0026] The retaining wall includes a plurality of sub-layers arranged in a stacked manner, and at least some of the sub-layers are arranged on the same layer as the insulating layer;

[0027] The number of sublayers included in the first subregion is smaller than the number of sublayers included in the second subregion, and the number of sublayers included in the first subregion is smaller than the number of sublayers included in the second region.

[0028] In some embodiments, the number and type of sublayers included in the second sub-region are the same as the number and type of sublayers included in the second region.

[0029] In some embodiments, the touch signal line includes a first portion corresponding to the first sub-region, and the first portion extends along the first direction.

[0030] In some embodiments, the touch signal line includes a first portion corresponding to the first sub-region;

[0031] An included angle between an extension direction of the first portion of at least some of the touch signal lines and the first direction is greater than or equal to 10° and less than or equal to 45°.

[0032] In some embodiments, the plurality of retaining walls include: a first retaining wall, and a second retaining wall located on a side of the first retaining wall away from the display area;

[0033] Part of the touch signal line includes: a first portion corresponding to the first sub-area of ​​the first retaining wall, and a first portion corresponding to the first sub-area of ​​the second retaining wall; and an angle between an extension direction of the first portion of the touch signal line and the first direction is greater than or equal to 10° and less than or equal to 45°, and the extension direction of the first portion corresponding to the first sub-area of ​​the first retaining wall intersects with the extension direction of the first portion corresponding to the first sub-area of ​​the second retaining wall.

[0034] In some embodiments, the plurality of retaining walls include: a first retaining wall, and a second retaining wall located on a side of the first retaining wall away from the display area;

[0035] At least part of the touch signal line further includes: a second portion located on a side of the first portion facing the display area;

[0036] The second portion extends along the first direction;

[0037] The orthographic projection of the second portion on the base substrate overlaps with the orthographic projection of the first retaining wall on the base substrate, and in the area overlapping with the orthographic projection of the second portion on the base substrate, the thickness of the first retaining wall is less than or equal to 4.2 microns.

[0038] An embodiment of the present disclosure provides a touch display panel, the touch display panel comprising:

[0039] The base substrate includes a display area and a peripheral area surrounding the display area; the peripheral area includes a first peripheral area located on one side of the display area in a first direction;

[0040] A plurality of retaining walls are located in the peripheral area; the orthographic projections of the retaining walls on the base substrate surround the display area; at least one retaining wall includes: a first area and a second area; the second area has a corner, and portions of the first area and the second area are located in the first peripheral area; and in the first peripheral area, the second area includes portions located on opposite sides of the first area in a second direction; the first direction is perpendicular to the second direction; and in a direction perpendicular to the base substrate, a thickness of the first area is less than a thickness of the second area;

[0041] A plurality of touch signal lines are located at least in a first peripheral region and on a side of the retaining wall away from the base substrate. In the first peripheral region, an orthographic projection of at least some of the touch signal lines on the base substrate overlaps with an orthographic projection of the second region on the base substrate, and a thickness of the second region in a direction perpendicular to the base substrate in the region that overlaps with the orthographic projection of the touch signal lines on the base substrate is less than or equal to 4.2 microns.

[0042] In some embodiments, the touch display panel further includes: a multi-layer insulation layer located between the touch signal line and the base substrate;

[0043] The retaining wall includes a plurality of sub-layers arranged in a stacked manner, and at least some of the sub-layers are arranged on the same layer as the insulating layer;

[0044] In a direction away from the substrate, the widths of the multiple sub-layers in a direction perpendicular to the extending direction of the retaining wall gradually decrease, and at least the retaining wall of the second region has a stepped side surface including multiple steps.

[0045] In some embodiments, the side surfaces of at least some sub-layers of the second region include multiple steps.

[0046] In some embodiments, the slope angle of the stepped side surface of the second region is greater than or equal to 15° and less than or equal to 20°.

[0047] In some embodiments, a distance between orthographic projections of two adjacent steps on the substrate is greater than or equal to 15 micrometers and less than or equal to 20 micrometers.

[0048] In some embodiments, in a region overlapping with an orthographic projection of at least a portion of the second region of the retaining wall on the base substrate, an angle between an extending direction of the touch signal line and the first direction is greater than or equal to 10° and less than or equal to 45°.

[0049] An embodiment of the present disclosure provides a touch display panel, the touch display panel comprising:

[0050] The base substrate includes a display area and a peripheral area surrounding the display area; the peripheral area includes a first peripheral area located on one side of the display area in a first direction;

[0051] A plurality of retaining walls are located in the peripheral area; the orthographic projections of the retaining walls on the base substrate surround the display area; the retaining walls include: a first area and a second area; portions of the first area and the second area are located in the first peripheral area; and in the first peripheral area, the second area includes portions located on opposite sides of the first area in a second direction; the first direction is perpendicular to the second direction; and in a direction perpendicular to the base substrate, a thickness of the first area is less than a thickness of the second area;

[0052] A plurality of touch signal lines are located at least in a first peripheral area and on a side of the retaining wall away from the base substrate; in the first peripheral area, in an area overlapping with the orthographic projection of the retaining wall on the base substrate, an angle between an extension direction of at least some of the touch signal lines and the first direction is greater than or equal to 10° and less than or equal to 45°.

[0053] In some embodiments, at least one retaining wall includes: a first region and a second region; portions of the first region and the second region are located in a first peripheral region; and in the first peripheral region, the second region includes portions located on opposite sides of the first region in a second direction; the first direction is perpendicular to the second direction; and in a direction perpendicular to the substrate, a thickness of the first region is less than a thickness of the second region;

[0054] In the first peripheral area, the orthographic projection of at least part of the multiple touch signal lines on the substrate overlaps with the orthographic projection of the second area on the substrate, and in the area that overlaps with the orthographic projection of the second area of ​​at least part of the retaining wall on the substrate, the angle between the extension direction of the touch signal line and the first direction is greater than or equal to 10° and less than or equal to 45°.

[0055] In some embodiments, the plurality of retaining walls include: a first retaining wall, and a second retaining wall located on a side of the first retaining wall away from the display area;

[0056] The portion of the touch signal line includes: a first portion corresponding to the second area of ​​the first retaining wall, and a first portion corresponding to the second area of ​​the second retaining wall; and an angle between an extension direction of the first portion of the touch signal line and the first direction is greater than or equal to 10° and less than or equal to 45°, and the extension direction of the first portion corresponding to the second area of ​​the first retaining wall intersects with the extension direction of the first portion corresponding to the second area of ​​the second retaining wall.

[0057] In some embodiments, the plurality of retaining walls include: a first retaining wall, and a second retaining wall located on a side of the first retaining wall away from the display area;

[0058] At least part of the touch signal line further includes: a second portion located on a side of the first portion facing the display area;

[0059] The second portion extends along the first direction;

[0060] The orthographic projection of the second portion on the base substrate overlaps with the orthographic projection of the first retaining wall on the base substrate, and in the area overlapping with the orthographic projection of the second portion on the base substrate, the thickness of the first retaining wall is less than or equal to 4.2 microns.

[0061] An embodiment of the present disclosure provides a display device, which includes: a touch display panel provided by an embodiment of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] 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.

[0063] FIG1 is a schematic structural diagram of a touch display panel provided by an embodiment of the present disclosure;

[0064] FIG2 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0065] FIG3 is a cross-sectional view of a retaining wall provided by an embodiment of the present disclosure;

[0066] FIG4 is a cross-sectional view of another retaining wall provided by an embodiment of the present disclosure;

[0067] FIG5 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0068] FIG6 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0069] FIG7 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0070] FIG8 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0071] FIG9 is a cross-sectional view of another retaining wall provided by an embodiment of the present disclosure;

[0072] FIG10 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0073] FIG11 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0074] FIG12 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0075] FIG13 is a cross-sectional view of another retaining wall provided by an embodiment of the present disclosure;

[0076] FIG14 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0077] FIG15 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0078] FIG16 is a schematic structural diagram of another touch display panel provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0079] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. And in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0080] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0081] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual scale and are only for the purpose of illustrating the present disclosure. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0082] In related technologies, organic light-emitting diode display panels require retaining walls to prevent overflow from the organic encapsulation layer. For touch display panels using Flexible Multi-Layer On Cell (FMLOC) technology, the touch layer is placed on the encapsulation layer, and the touch signal lines extending upward from the binding area need to cross the retaining wall. If the retaining wall thickness is too thick in the area where the touch signal line crosses the retaining wall, the touch signal line will break at the point where it crosses the retaining wall. The touch signal cannot be transmitted at the break, affecting the yield of the touch display panel.

[0083] An embodiment of the present disclosure provides a touch display panel, as shown in FIG1 , the touch display panel includes:

[0084] The base substrate 1 includes a display area 101 and a peripheral area 102 surrounding the display area 101 ; the peripheral area 102 includes a first peripheral area 1021 located on one side of the display area 101 in a first direction Y;

[0085] A plurality of retaining walls 2 are located in the peripheral area 102; the orthographic projections of the retaining walls 2 on the base substrate 1 surround the display area 101; at least one retaining wall 2 includes a first area 201 and a second area 202; portions of the first area 201 and the second area 202 are located in the first peripheral area 1021; and in the first peripheral area 1021, the second area 202 includes portions located on opposite sides of the first area 201 in a second direction X; the first direction Y is perpendicular to the second direction X; and in a direction perpendicular to the base substrate 1, the thickness of at least a portion of the first area 201 is less than the thickness of the second area 202.

[0086] Multiple touch signal lines 3 are located at least in the first peripheral area 1021 and on the side of the retaining wall 2 away from the base substrate 1; in the first peripheral area 1021, the orthographic projection of at least some of the multiple touch signal lines 3 on the base substrate 1 overlaps with the orthographic projection of the first area 201 having a thickness less than that of the second area 202 on the base substrate 1, and the orthographic projection of the multiple touch signal lines 3 on the base substrate 1 does not overlap with the orthographic projection of the second area 202 of the retaining wall 2 on the base substrate 1.

[0087] In the touch display panel provided by the embodiment of the present disclosure, in the first peripheral area, the orthographic projection of the touch signal line on the base substrate overlaps with the orthographic projection of the first area having a thickness less than that of the second area on the base substrate, and the orthographic projection of the touch signal line on the base substrate and the orthographic projection of the second area of ​​the retaining wall on the base substrate do not overlap with each other. That is, in the first peripheral area, the touch signal line and the area with the thicker thickness of the retaining wall do not overlap with each other, which can avoid the touch signal line from breaking when crossing the area with the thicker thickness of the retaining wall, and can improve the yield of the touch display panel.

[0088] In some embodiments, as shown in FIG1 , in the first peripheral region 1021 , the extension direction of the first region 201 is parallel to the edge of the touch display panel, that is, parallel to the edge of the base substrate 1 , that is, the first region 201 extends along the second direction X, and the second region 202 has a corner 2021 ; in a direction perpendicular to the base substrate 1 , the thickness of the first region 201 is less than the thickness of the second region 202 ;

[0089] The orthographic projections of the plurality of touch signal lines 3 on the base substrate 1 overlap with the orthographic projections of the first region 201 on the base substrate 1 .

[0090] Specifically, the touch display panel provided by the disclosed embodiments has a first region parallel to the edge of the touch display panel with a thickness less than that of the second region; in the first peripheral region, the orthographic projection of the touch signal line on the substrate overlaps with the orthographic projection of the first region on the substrate, but does not overlap with the orthographic projection of the second region on the substrate. In the disclosed embodiments, the second region, with its thicker retaining wall, avoids the placement of the touch signal line. By reducing the length of the second region in the second direction, the disclosed embodiments can avoid the problem of touch signal line breakage in the second region due to the touch signal line climbing over the retaining wall.

[0091] In some embodiments, as shown in Figure 1, the portion outside the first area 201 is the second area 202, and the second area 202 is divided into a first sub-area 202-1 and two second sub-areas 202-2 along the angle bisector of the corner of the first peripheral area 1021; at least part of the area of ​​the two second sub-areas 202-2 is parallel to the second direction X; the second sub-area 202-2 is located in the first peripheral area 1021, and the two second sub-areas 202-2 are located on opposite sides of the first area 201 in the second direction X.

[0092] It should be noted that the embodiment of the present disclosure can shorten the length of the second sub-area located in the first area so that the second area avoids the touch signal line, avoiding the touch signal line from climbing and breaking when crossing the second area of ​​the retaining wall, thereby improving the yield of the touch display panel.

[0093] It should be noted that the shape of the base substrate is generally the same as that of the touch display panel. In Figure 1, the base substrate 1 is rectangular, meaning that the corners of the base substrate 1 are right angles, and the corresponding corners of the retaining wall 2 are also right angles. Alternatively, as shown in Figure 2, the base substrate 1 is rectangular, meaning that the corners of the base substrate 1 are rounded, and the corresponding corners of the retaining wall 2 are also rounded. Figure 4 only shows a portion of the touch display panel.

[0094] In some embodiments, as shown in FIG1 , the extension direction of at least a portion of the touch signal line 3 intersects with the extension direction of the first area 201 ;

[0095] The distance h1 between the orthographic projection of the touch signal line 3 closest to the second area 202 on the substrate 1 and the orthographic projection of the second area 202 on the substrate 1 is greater than or equal to 3 μm, thereby preventing part of the touch signal line from being located above the second area due to process fluctuations.

[0096] Furthermore, if there is sufficient wiring space, in some embodiments, as shown in FIG3 , the distance h1 between the orthographic projection of the touch signal line 3 closest to the second region 202 on the substrate 1 and the orthographic projection of the second region 202 on the substrate 1 is greater than or equal to 20 microns and less than or equal to 100 microns. This can further prevent part of the touch signal line from being located above the second region due to process fluctuations.

[0097] In some embodiments, as shown in FIG3 , FIG4 , and FIG5 , the touch display panel further includes: a multi-layer insulating layer 4 located between the touch signal line 3 and the base substrate 1 ;

[0098] As shown in Figure 5, the touch display panel also includes: a driving circuit layer 7 located on one side of the base substrate 1, a light-emitting device 9 located on the side of the driving circuit layer 7 facing away from the base substrate 1, and an encapsulation layer 10 located on the side of the light-emitting device 9 facing away from the base substrate, and a touch layer 6 located on the side of the encapsulation layer 10 facing away from the base substrate 1.

[0099] The touch display panel provided in the embodiment of the present disclosure adopts the FMLOC process, that is, the touch layer is directly manufactured on the stacked light-emitting structure layer and the packaging layer, which can reduce the thickness of the touch display panel and is conducive to realizing the lightweight and thin touch display product.

[0100] 5 , the encapsulation layer 10 includes a stacked first inorganic encapsulation layer 1001, an organic encapsulation layer 1002, and a second inorganic encapsulation layer 1003. The retaining wall in the peripheral region is used to prevent the organic encapsulation material from overflowing.

[0101] In a specific implementation, the touch layer includes a plurality of touch electrodes and a plurality of touch signal lines.

[0102] In some embodiments, as shown in Figure 5, the touch layer 6 specifically includes: a second buffer layer 601 located on the side of the encapsulation layer 10 facing away from the base substrate 1, a first touch conductive layer 602 located on the side of the second buffer layer 601 facing away from the base substrate 1, a touch insulating layer 603 located on the side of the first touch conductive layer 602 facing away from the base substrate 1, a second touch conductive layer 604 located on the side of the touch insulating layer 603 facing away from the base substrate 1, and a protective layer 605 located on the side of the second touch conductive layer 604 facing away from the base substrate 1.

[0103] In some embodiments, the first touch conductive layer and the second touch conductive layer include a metal grid structure formed by interweaving metal lines.

[0104] In some embodiments, in the display area 101 , the multi-layer touch conductive layer includes a plurality of touch electrodes. As shown in FIG6 , the plurality of touch electrodes include a plurality of first touch electrodes 11 and a plurality of second touch electrodes 12 .

[0105] The plurality of first touch electrodes 11 are arranged along the second direction X and extend along the first direction Y. The first touch electrode 201 includes a plurality of first sub-electrodes 1101 arranged along the first direction Y and a bridge electrode 1102 electrically connecting two adjacent first sub-electrodes 1101 .

[0106] The plurality of second touch electrodes 12 extend along the second direction X and are arranged along the first direction Y. The second touch electrodes 12 include a plurality of second sub-electrodes 1201 arranged along the second direction X.

[0107] In some embodiments, as shown in FIG6 , the first sub-electrode 1101 and the second sub-electrode 1201 are located in the second touch conductive layer 604 , and the bridging electrode 1102 is located in the first touch conductive layer 602 ; in a specific implementation, the bridging electrode 1102 is electrically connected to the first sub-electrode 1101 through a via hole penetrating the touch insulating layer.

[0108] In some embodiments, the touch traces are located in the first touch conductive layer or the second touch conductive layer.

[0109] Alternatively, in some embodiments, the touch trace includes a first sub-trace located in a first touch conductive layer and a second sub-trace located in a second touch conductive layer; the second sub-trace is electrically connected to the first sub-trace via a via penetrating the touch insulating layer. This means that the touch trace is arranged in two layers. By connecting the first and second sub-trace in parallel, the impedance of the touch trace can be reduced.

[0110] In some embodiments, as shown in FIG1 , the first peripheral area 1021 further includes a binding area 15 located on a side of the plurality of retaining walls 2 away from the display area 101 ;

[0111] The touch display panel further includes a plurality of first binding electrodes 14 located in the binding area; the plurality of first binding electrodes 14 are used to be bound to a driver chip (not shown);

[0112] One end of the touch signal line 3 is electrically connected to the first binding electrode 14 , and the other end of the touch signal line 3 is electrically connected to a touch electrode (not shown).

[0113] In some embodiments, as shown in FIG5 , the light-emitting device 9 includes an anode 901 , a light-emitting functional layer 902 , and a cathode 903 that are stacked.

[0114] In a specific implementation, if the light-emitting device is an organic light-emitting diode, the light-emitting functional layer includes at least an organic light-emitting layer, and may also include at least one of the following: an electron injection layer, a hole blocking layer, an electron transport layer, a hole transport layer, an electron blocking layer, and a hole injection layer.

[0115] In some embodiments, as shown in FIG5 , the driving circuit layer 7 includes a pixel driving circuit that corresponds one-to-one with the light emitting device 9 and drives the light emitting device 9 to emit light; the pixel driving circuit includes, for example, a thin film transistor TFT and a capacitor (not shown).

[0116] It should be noted that, in FIG5 , a thin film transistor TFT is illustrated as a top gate structure, that is, the gate G is located on the side of the active layer 701 away from the base substrate 1; the multilayer insulating layer 4 includes: a first buffer layer 401 located between the base substrate 1 and the active layer 701, a first gate insulating layer 402 located between the gate G and the active layer 701, an interlayer insulating layer 403 located between the gate G and the source S and the drain D, a passivation layer 407 located between the interlayer insulating layer 403 and the source S and the drain D, and a first gate insulating layer 408 located between the source S and the drain D and the anode. a first planarization layer 404 between the anodes 901 and the pixel definition layer 408 located on the side of the anode 901 away from the substrate 1; the pixel definition layer 408 includes a plurality of opening areas 4081, the pixel definition layer 408 covers the edge of the anode 901, and the orthographic projection of the opening area 4081 on the substrate 1 falls within the orthographic projection of the anode 901 on the substrate 1; the light-emitting functional layer 902 is located on the side of the anode 901 and the pixel definition layer 408 away from the substrate 1, and the cathode 903 is located on the side of the light-emitting functional layer 902 away from the substrate 1.

[0117] In some embodiments, the anode is connected to the drain through a via hole penetrating the first planarization layer.

[0118] Alternatively, in order to avoid the risk of disconnection due to the overlap between the anode and the drain, in some embodiments, as shown in FIG5 , the touch display panel further includes a first transfer electrode 702 located between the first planarization layer 404 and the anode 901 , and a second transfer electrode 703 located between the first transfer electrode 702 and the anode 901 ;

[0119] The multilayer insulation layer 4 includes: a second planarization layer 405 located between the second transfer electrode 703 and the first transfer electrode 702, and a third planarization layer 406 located between the second transfer electrode 703 and the anode 901. The anode 901 is connected to the second transfer electrode 703 via a via hole penetrating the third planarization layer 406. The second transfer electrode 703 is electrically connected to the first transfer electrode 702 via a via hole penetrating the second planarization layer 1038. The first transfer electrode 702 is connected to the drain D via a via hole penetrating the first planarization layer 404.

[0120] In some embodiments, as shown in FIG. 3 , the multi-layer insulating layer 4 further includes a spacer layer 409 located on a side of the pixel definition layer 408 facing away from the base substrate 1 .

[0121] In some embodiments, as shown in FIG3 and FIG4 , the retaining wall 2 includes a plurality of stacked sub-layers 5 , at least some of which are provided on the same layer as the insulating layer 4 ;

[0122] The number of sub-layers 5 included in the second region 202 is greater than the number of sub-layers 5 included in the first region 201 .

[0123] It should be noted that FIG3 is a cross-sectional view along CC′ in FIG1 , and FIG4 is a cross-sectional view along EE′ in FIG1 .

[0124] In some embodiments, as shown in FIG. 1 , the plurality of retaining walls 2 include: a first retaining wall 2 - 1 , and a second retaining wall 2 - 2 located on a side of the first retaining wall 2 - 1 away from the display area 101 .

[0125] In some embodiments, the thickness of the first region of the first retaining wall is less than or equal to the thickness of the first region of the second retaining wall; and the thickness of the second region of the first retaining wall is less than or equal to the thickness of the second region of the second retaining wall, thereby better preventing the organic encapsulation material from overflowing.

[0126] It should be noted that, as shown in Figure 3, the second area 202 of the first retaining wall 2-1 includes three sub-layers 5, namely the first sub-layer 501, the second sub-layer 502, and the third sub-layer 503 stacked in sequence on one side of the base substrate 1; the second area 202 of the second retaining wall 2-2 includes four sub-layers, namely the fourth sub-layer 504, the first sub-layer 501, the second sub-layer 502, and the third sub-layer 503 stacked in sequence on one side of the base substrate 1.

[0127] 3 , the first sublayer 501 and the second planarization layer 406 are arranged on the same layer, the second sublayer 502 and the pixel definition layer 408 are arranged on the same layer, the third sublayer 503 and the spacer 409 are arranged on the same layer, and the fourth sublayer 504 and the first planarization layer 405 are arranged on the same layer as an example.

[0128] In some embodiments, as shown in Figure 4, the first area 201 of the first retaining wall 2-1 includes two sub-layers 5, namely, a first sub-layer 501 and a second sub-layer 502 stacked in sequence on one side of the base substrate 1; the first area 201 of the second retaining wall 2-2 includes two sub-layers 5, namely, a first sub-layer 501 and a second sub-layer 502 stacked in sequence on one side of the base substrate 1.

[0129] In a specific implementation, the sub-layers of each retaining wall in the first area and the second area are the same sub-layers.

[0130] In some embodiments, as shown in FIG1 , in the first peripheral area 1021 , the boundary between the first area 201 and the second area 202 in the second retaining wall 2 - 2 is closer to the symmetry axis 13 of the touch display panel parallel to the first direction Y than the boundary between the first area 201 and the second area 202 in the first retaining wall 2 - 1 .

[0131] That is, in the touch display panel provided by the embodiment of the present disclosure, the cut-off position of the second zone of the first retaining wall closer to the display area is earlier than the cut-off position of the second zone of the second retaining wall farther away from the display area. In this way, even if the encapsulation layer material exceeds the first retaining wall, the second zone of the second retaining wall can still prevent the encapsulation layer material from overflowing, which is beneficial to improving the manufacturing yield of the touch display panel.

[0132] In some embodiments, the absolute value of the difference between the distance between the boundary between the first area 201 and the second area 202 in the second retaining wall 2-2 and the symmetry axis 13 of the touch display panel parallel to the first direction Y and the distance between the boundary between the first area 201 and the second area 202 in the first retaining wall 2-1 and the symmetry axis 13 parallel to the first direction Y is greater than or equal to 100 microns and less than or equal to 200 microns.

[0133] In some embodiments, as shown in FIG. 7 , the portion of the touch signal line 3 where the orthographic projection overlaps the retaining wall 2 extends along the first direction Y, and the portion connected to the touch signal line 3 extends along the second direction X.

[0134] In some embodiments, as shown in FIG. 7 , the touch display panel further includes a dummy signal line 16 and a short bar 17 .

[0135] In a specific implementation, if there is sufficient wiring space between two adjacent touch signal lines, a dummy signal line can be provided between the two adjacent touch signal lines. The dummy signal line is a single-layer wiring, for example, located in the second touch conductive layer.

[0136] In a specific implementation, as shown in Figure 7, the orthographic projection of short-circuit line 17 on the substrate falls within second retaining wall 2-2. Short-circuit line 17 extends along the second direction X and is electrically connected to multiple touch signal lines 3. The function of short-circuit line 17 is to maintain equal potential and reduce the probability of electrostatic discharge (ESD) from the mask used in the patterning process. The distance between short-circuit line 17 and the edges of second retaining wall 2-2 is equal, and the line width of short-circuit line 17 is approximately 0.7 microns.

[0137] In a specific implementation, when the touch signal lines are wired in two layers, the short circuit lines are also wired in two layers.

[0138] In some embodiments, as shown in FIG. 7 , the touch signal line 3 has a concave area 18 at the connection between the short circuit line 17 and the touch signal line 3 , so that optical proximity correction (OPC) compensation can be performed on the short circuit line 17 .

[0139] Alternatively, in some embodiments, as shown in FIG8 , the first region 201 extends along the second direction X, and the second region 202 has a corner 2021 ;

[0140] The first region 201 includes: a plurality of first sub-regions 2011 and a plurality of second sub-regions 2012; in the second direction X, the first sub-regions 2011 and the second sub-regions 2012 are alternately arranged; in a direction perpendicular to the substrate 1, the thickness of the first sub-regions 2011 is smaller than the thickness of the second sub-regions 2012, and the thickness of the first sub-regions 2011 is smaller than the thickness of the second region 202;

[0141] The orthographic projection of the touch signal line 3 on the base substrate 1 overlaps with the orthographic projection of the first sub-region 2011 on the base substrate 1 , and the orthographic projection of the touch signal line 3 on the base substrate 1 does not overlap with the orthographic projection of the second sub-region 2012 on the base substrate 1 .

[0142] The touch display panel provided by the embodiment of the present disclosure has a first area including a first sub-area with a smaller thickness and a second sub-area with a thicker thickness. The orthographic projection of the touch signal line on the substrate overlaps with the orthographic projection of the first sub-area with a smaller thickness on the substrate, and the orthographic projection of the touch signal line on the substrate does not overlap with the second sub-area and the orthographic projection of the second area on the substrate. That is, in the first peripheral area, the touch signal line does not overlap with the area with the thicker barrier wall, which can avoid the touch signal line from breaking when crossing the area with the thicker barrier wall, and can improve the yield of the touch display panel.

[0143] In some embodiments, as shown in FIG8 , some first sub-areas 2011 correspond to one touch signal line 3, and some first sub-areas 2011 correspond to multiple touch signal lines 3. For ease of distinction, this disclosure refers to the first sub-area 2011 corresponding to one touch signal line 3 as a first-category first sub-area 2011-1, and the first sub-area 2011 corresponding to multiple touch signal lines 3 as a second-category first sub-area 2011-2.

[0144] In a specific implementation, as shown in FIG8 , the two sides of the second-type first sub-region 2011-2 include alternating first-type first sub-regions 2011-1 and second sub-regions 2021. Specifically, in the touch display panel provided by the present embodiment, the thickness of the retaining wall is reduced in the corners where the retaining wall overlaps the touch signal line, to prevent the touch signal line from breaking when crossing the thicker retaining wall area.

[0145] In a specific implementation, the thickness of the barrier wall in the area overlapping with the orthographic projection of the touch signal line on the base substrate is less than or equal to 4.2 microns, thereby preventing the touch signal line from being broken when crossing the area with thicker barrier wall.

[0146] In a specific implementation, the thickness of the first type first subregion is the same as that of the second type first subregion; the number and type of sublayers included in the first type first subregion are the same as those of the second type first subregion.

[0147] In some embodiments, a distance between an orthographic projection of a boundary between the first sub-region and the second sub-region on the substrate and an edge of the orthographic projection of the touch signal line closest to the boundary on the substrate is greater than or equal to 3 micrometers and less than or equal to 5 micrometers;

[0148] And / or, the distance between the orthographic projection of the boundary between the first sub-region and the second region on the substrate and the edge of the orthographic projection of the touch signal line closest to the boundary on the substrate is greater than or equal to 3 micrometers and less than or equal to 5 micrometers.

[0149] Therefore, even if process deviation occurs, it can be ensured that the touch signal line is located above the first sub-region.

[0150] In some embodiments, as shown in FIG9 , in each retaining wall 2, the thickness of the second sub-region 2012 in a direction perpendicular to the base substrate 1 is equal to the thickness of the second region 202 in a direction perpendicular to the base substrate 1. Simply by changing the pattern of some sub-layers of the retaining wall, the touch signal line can be positioned above the first sub-region, thereby reducing the difficulty in designing and manufacturing the retaining wall.

[0151] It should be noted that FIG9 is a cross-sectional view taken along line FF′ in FIG8 , and FIG9 only shows the base substrate 1 and the retaining wall 2 .

[0152] In some embodiments, as shown in Figure 9, the number of sub-layers 5 included in the first sub-region 2011 is less than the number of sub-layers 5 included in the second sub-region 2012, and the number of sub-layers 5 included in the first sub-region 2011 is less than the number of sub-layers 5 included in the second region 202.

[0153] In some embodiments, as shown in FIG. 9 , the number and type of the sub-layers 5 included in the second sub-region 2012 are the same as the number and type of the sub-layers 5 included in the second zone 202 .

[0154] It should be noted that, in FIG9 , taking the first retaining wall as an example, the second sub-region 2012 and the second zone 202 both include three sub-layers, namely the first sub-layer 501, the second sub-layer 502, and the third sub-layer 503. The first sub-region 2011 includes two sub-layers, namely the first sub-layer 501 and the second sub-layer 502.

[0155] In specific implementation, the sublayers included in the second zone and the second sub-zone in the second retaining wall can be the same as the sublayers included in the second zone of the second retaining wall 2-2 in Figure 3, and the first sub-zone in the second retaining wall can be the same as the sublayers included in the first zone of the second retaining wall 2-2 in Figure 4.

[0156] In some embodiments, in the first peripheral area, the boundary between the second type first sub-region and the second sub-region in the second retaining wall is closer to the symmetry axis of the touch display panel parallel to the first direction Y than the boundary between the second type first sub-region and the second sub-region in the first retaining wall.

[0157] That is, in the touch display panel provided by the embodiment of the present disclosure, the cutoff position of the thicker area of ​​the first retaining wall closer to the display area is earlier than the cutoff position of the thicker area of ​​the second retaining wall farther away from the display area. In this way, even if the encapsulation layer material exceeds the first retaining wall, the second sub-area of ​​the second retaining wall can still prevent the encapsulation layer material from overflowing, which is beneficial to improving the yield rate of touch display panel manufacturing.

[0158] In some embodiments, the absolute value of the difference between the distance between the boundary between the second type first sub-region and the second sub-region in the second retaining wall and the symmetry axis of the touch display panel parallel to the first direction Y, and the distance between the boundary between the second type first sub-region and the second sub-region in the first retaining wall and the symmetry axis of the touch display panel parallel to the first direction Y is greater than or equal to 100 microns and less than or equal to 200 microns.

[0159] In some embodiments, as shown in FIG8 , the touch signal line 3 includes a first portion 301 corresponding to the first sub-region 2011 ;

[0160] The first portion 301 extends along a first direction Y.

[0161] Alternatively, in some embodiments, as shown in FIG10 , the touch signal line 3 includes a first portion 301 corresponding to the first sub-region 2011 ;

[0162] An included angle θ between the extension direction of the first portion 301 of some touch signal lines 3 and the first direction Y is greater than or equal to 10° and less than or equal to 45°.

[0163] The touch display panel provided by the embodiment of the present disclosure has at least part of the touch signal lines including a first portion whose extension direction is not perpendicular to the first direction Y, that is, the first portion extends obliquely relative to the first direction Y, thereby increasing the length of the touch signal line corresponding to the unit thickness of the retaining wall, which is more conducive to avoiding the risk of the touch signal line breaking when crossing the retaining wall. If the angle θ is too small, the length of the touch signal line corresponding to the unit thickness of the retaining wall is also small, and the effect of improving the risk of breaking is small; if the angle θ is too large, it will occupy too much wiring space. The touch display panel provided by the embodiment of the present disclosure has an angle θ greater than or equal to 10° and less than or equal to 45°, which can effectively increase the length of the touch signal line corresponding to the unit thickness of the retaining wall while avoiding excessive increase in the wiring space of the touch signal line, which is conducive to achieving a narrow frame.

[0164] It should be noted that, as shown in FIG8 , the angle θ between the extension direction of the first portion 301 of the touch signal line 3 and the first direction Y is less than or equal to 90°.

[0165] In some embodiments, as shown in FIG. 10 , an angle θ between an extension direction of the first portion 301 corresponding to the first-type first sub-region 2011 - 1 and the first direction Y is greater than or equal to 10° and less than or equal to 45°.

[0166] In some embodiments, the touch signal line extends along the first direction Y with an overlapping portion with the second-type first sub-region.

[0167] In some embodiments, as shown in Figure 10, part of the touch signal line 3 includes: a first portion 301 corresponding to the first sub-region 2011 of the first retaining wall 2-1 (marked as 301-1 in the figure in Figure 10), and a first portion 301 corresponding to the first sub-region 2011 of the second retaining wall 2-2 (marked as 301-2 in the figure in Figure 10); and an angle θ between an extension direction of the first portion 301 included in the part of the touch signal line 3 and the first direction Y is greater than or equal to 10° and less than or equal to 45°, and the extension direction of the first portion 301 corresponding to the first sub-region 2011 of the first retaining wall 2-1 and the extension direction of the first portion 301 corresponding to the first sub-region 2011 of the second retaining wall 2-2 intersect.

[0168] In some embodiments, as shown in Figure 10, in some touch signal lines 3, the angle θ between the extension direction of the first portion 301 corresponding to the first type first sub-region 2011-1 of the first retaining wall 2-1 and the first direction Y is greater than or equal to 10° and less than or equal to 45°, and the angle θ between the extension direction of the first portion 301 corresponding to the first type first sub-region 2011-1 of the second retaining wall 2-2 and the first direction Y is greater than or equal to 10° and less than or equal to 45°; and the extension direction of the first portion 301 corresponding to the first type first sub-region 2011-1 of the first retaining wall 2-1 and the extension direction of the first portion 301 corresponding to the first type first sub-region 2011-1 of the second retaining wall 2-2 intersect.

[0169] In the touch display panel provided by the disclosed embodiments, the first portions of some touch signal lines corresponding to the first and second retaining walls extend obliquely relative to the first direction Y. This increases the length of the touch signal lines per unit thickness of the retaining walls, further helping to avoid the risk of disconnection of the touch signal lines due to crossing over the retaining walls. Furthermore, since the first portions corresponding to the two retaining walls extend in intersecting directions, this also helps to avoid excessively increasing the space occupied by the touch signal lines in the second direction X.

[0170] In a specific implementation, as shown in FIG10 , in some touch signal lines 3, the extension direction of the first portion 301 corresponding to the first type first sub-region 2011-1 of the first retaining wall 2-1 passes through the second quadrant and the fourth quadrant of the coordinate system composed of the first direction Y and the second direction X, and the extension direction of the first portion 301 corresponding to the first type first sub-region 2011-1 of the second retaining wall 2-2 passes through the first quadrant and the third quadrant of the coordinate system composed of the first direction Y and the second direction X.

[0171] Alternatively, in some touch signal lines, the extension direction of the first portion corresponding to the first type first sub-region of the first retaining wall passes through the first quadrant and the third quadrant of the coordinate system formed by the first direction Y and the second direction X, and the extension direction of the first portion corresponding to the first type first sub-region of the second retaining wall passes through the second quadrant and the fourth quadrant of the coordinate system formed by the first direction Y and the second direction X.

[0172] In specific implementation, according to actual wiring space, the extension directions of the two first portions corresponding to the same retaining wall and overlapping with the orthographic projections of the first type first sub-regions located on both sides of the second type first sub-region can be symmetrically arranged.

[0173] Alternatively, in some embodiments, as shown in FIG11 , at least part of the touch signal line 3 further includes: a second portion 302 located on a side of the first portion 301 facing the display area 101 ;

[0174] The second portion 302 extends along the first direction Y;

[0175] The orthographic projection of the second portion 302 on the base substrate 1 overlaps with the orthographic projection of the first retaining wall 2 - 1 on the base substrate 1 .

[0176] In specific implementation, the thickness of the first retaining wall is usually less than or equal to the thickness of the second retaining wall. When the thickness of the first retaining wall is less than the thickness of the second retaining wall in the first sub-area corresponding to the touch signal line, only the first part extending obliquely is set at the second retaining wall, and the second part perpendicular to the retaining wall is set at the first retaining wall. This can also avoid the risk of the touch signal line being broken when crossing the retaining wall, and is also beneficial to saving wiring space.

[0177] In some embodiments, in a region overlapping with an orthographic projection of the second portion 302 on the base substrate 1 , a thickness of the first retaining wall 2 - 1 is less than or equal to 4.2 micrometers.

[0178] 11 , in some touch signal lines 3 , the extension direction of the first portion 301 corresponding to the first type first sub-region 2011 - 1 of the second retaining wall 2 - 2 passes through the first and third quadrants of the coordinate system formed by the first direction Y and the second direction X.

[0179] Alternatively, the extension direction of the first portion of some touch signal lines corresponding to the first sub-region of the first type of the second retaining wall passes through the second quadrant and the fourth quadrant of the coordinate system formed by the first direction Y and the second direction X.

[0180] In specific implementation, according to actual wiring space, the extension directions of the two first portions corresponding to the second retaining wall and overlapping with the orthographic projections of the first type first sub-regions located on both sides of the second type first sub-region can be symmetrically arranged.

[0181] To address the problem in related technologies that a touch signal line may be easily disconnected when crossing a retaining wall, an embodiment of the present disclosure further provides a touch display panel, as shown in FIG12 . The touch display panel includes:

[0182] The base substrate 1 includes a display area 101 and a peripheral area 102 surrounding the display area 101 ; the peripheral area 102 includes a first peripheral area 1021 located on one side of the display area 101 in a first direction Y;

[0183] Multiple retaining walls 2 are located in the peripheral area 102; the orthographic projections of the retaining walls 2 on the base substrate 1 surround the display area 101; at least one retaining wall 2 includes: a first area 201 and a second area 202; the second area 202 has a corner 2021, and portions of the first area 201 and the second area 202 are located in the first peripheral area 1021; and in the first peripheral area 1021, the second area 202 includes portions located on opposite sides of the first area 201 in a second direction X; the first direction Y is perpendicular to the second direction X; and in a direction perpendicular to the base substrate 1, the thickness of the first area 201 is less than the thickness of the second area 202.

[0184] The plurality of touch signal lines 3 are located at least in the first peripheral area 1021 and on the side of the retaining wall 2 away from the base substrate 1. In the first peripheral area 1021, the orthographic projection of at least some of the plurality of touch signal lines 3 on the base substrate 1 overlaps with the orthographic projection of the second area 202 on the base substrate 1. In the overlapping area with the orthographic projection of the touch signal line 3 on the base substrate 1, the thickness of the second area 202 in a direction perpendicular to the base substrate 1 is less than or equal to 4.2 microns.

[0185] In the touch display panel provided by the embodiment of the present disclosure, the thickness of the second area of ​​the retaining wall is less than or equal to 4.2 microns, so that even if the touch signal line crosses the second area of ​​the retaining wall, the risk of line breakage can be avoided.

[0186] It should be noted that the shape of the base substrate is generally the same as that of the touch display panel. In FIG12 , the base substrate 1 is rectangular, i.e., the corners of the base substrate 1 are right angles, and the corresponding corners of the retaining wall 2 are also right angles. Alternatively, the base substrate can be rectangular with rounded corners, i.e., the corners of the base substrate are rounded, and the corresponding corners of the retaining wall are also rounded.

[0187] In some embodiments, as shown in FIG. 13 and FIG. 5 , the touch display panel further includes: a multi-layer insulation layer 4 located between the touch signal line 3 and the base substrate 1 .

[0188] It should be noted that FIG13 is a cross-sectional view along line II' in FIG12 .

[0189] In some embodiments, as shown in Figure 5, the touch display panel further includes: a driving circuit layer 7 located on one side of the base substrate 1, a light-emitting device 9 located on the side of the driving circuit layer 7 facing away from the base substrate 1, and an encapsulation layer 10 located on the side of the encapsulation layer 10 facing away from the base substrate 1, and a touch layer 6 located on the side of the encapsulation layer 10 facing away from the base substrate 1.

[0190] The touch display panel provided in the embodiment of the present disclosure adopts the FMLOC process, that is, the touch layer is directly manufactured on the stacked light-emitting structure layer and the packaging layer, which can reduce the thickness of the touch display panel and is conducive to realizing the lightweight and thin touch display product.

[0191] 5 , the encapsulation layer 10 includes a stacked first inorganic encapsulation layer 1001, an organic encapsulation layer 1002, and a second inorganic encapsulation layer 1003. The retaining wall in the peripheral region is used to prevent the organic encapsulation material from overflowing.

[0192] In some embodiments, the thickness of the retaining wall in a direction perpendicular to the substrate is greater than or equal to 3 micrometers, thereby ensuring the retaining wall's effect of blocking overflow of the organic material.

[0193] In some embodiments, in the first peripheral area, the boundary between the first area and the second area in the second retaining wall is closer to the symmetry axis of the touch display panel parallel to the first direction Y than the boundary between the first area and the second area in the first retaining wall.

[0194] That is, in the touch display panel provided by the embodiment of the present disclosure, the cut-off position of the second zone of the first retaining wall closer to the display area is earlier than the cut-off position of the second zone of the second retaining wall farther away from the display area. In this way, even if the encapsulation layer material exceeds the first retaining wall, the second zone of the second retaining wall can still prevent the encapsulation layer material from overflowing, which is beneficial to improving the manufacturing yield of the touch display panel.

[0195] In some embodiments, the absolute value of the difference between the distance between the boundary between the first area and the second area in the second retaining wall and the symmetry axis of the touch display panel parallel to the first direction Y and the distance between the boundary between the first area and the second area in the first retaining wall and the symmetry axis of the touch display panel parallel to the first direction Y is greater than or equal to 100 microns and less than or equal to 200 microns.

[0196] In a specific implementation, the touch layer includes a plurality of touch electrodes and a plurality of touch signal lines.

[0197] In some embodiments, as shown in Figure 5, the touch layer 6 specifically includes: a second buffer layer 601 located on the side of the encapsulation layer 10 facing away from the base substrate 1, a first touch conductive layer 602 located on the side of the second buffer layer 601 facing away from the base substrate 1, a touch insulating layer 603 located on the side of the first touch conductive layer 602 facing away from the base substrate 1, a second touch conductive layer 604 located on the side of the touch insulating layer 603 facing away from the base substrate 1, and a protective layer 605 located on the side of the second touch conductive layer 604 facing away from the base substrate 1.

[0198] In some embodiments, the first touch conductive layer and the second touch conductive layer include a metal grid structure formed by interweaving metal lines.

[0199] In some embodiments, in the display area 101 , the multi-layer touch conductive layer includes a plurality of touch electrodes. As shown in FIG6 , the plurality of touch electrodes include a plurality of first touch electrodes 11 and a plurality of second touch electrodes 12 .

[0200] The plurality of first touch electrodes 11 are arranged along the second direction X and extend along the first direction Y. The first touch electrode 201 includes a plurality of first sub-electrodes 1101 arranged along the first direction Y and a bridge electrode 1102 electrically connecting two adjacent first sub-electrodes 1101 .

[0201] The plurality of second touch electrodes 12 extend along the second direction X and are arranged along the first direction Y. The second touch electrodes 12 include a plurality of second sub-electrodes 1201 arranged along the second direction X.

[0202] In some embodiments, as shown in FIG6 , the first sub-electrode 1101 and the second sub-electrode 1201 are located in the second touch conductive layer 604 , and the bridging electrode 1102 is located in the first touch conductive layer 602 ; in a specific implementation, the bridging electrode 1102 is electrically connected to the first sub-electrode 1101 through a via hole penetrating the touch insulating layer.

[0203] In some embodiments, the touch traces are located in the first touch conductive layer or the second touch conductive layer.

[0204] Alternatively, in some embodiments, the touch trace includes a first sub-trace located in a first touch conductive layer and a second sub-trace located in a second touch conductive layer; the second sub-trace is electrically connected to the first sub-trace via a via penetrating the touch insulating layer. This means that the touch trace is arranged in two layers. By connecting the first and second sub-trace in parallel, the impedance of the touch trace can be reduced.

[0205] In some embodiments, as shown in FIG12 , the first peripheral area 1021 further includes a binding area 15 located on a side of the plurality of retaining walls 2 away from the display area 101 ;

[0206] The touch display panel further includes a plurality of first binding electrodes 14 located in the binding area; the plurality of first binding electrodes 14 are used to be bound to a driver chip (not shown);

[0207] One end of the touch signal line 3 is electrically connected to the first binding electrode 14 , and the other end of the touch signal line 3 is electrically connected to a touch electrode (not shown).

[0208] In some embodiments, as shown in FIG5 , the light-emitting device 9 includes an anode 901 , a light-emitting functional layer 902 , and a cathode 903 that are stacked.

[0209] In a specific implementation, if the light-emitting device is an organic light-emitting diode, the light-emitting functional layer includes at least an organic light-emitting layer, and may also include at least one of the following: an electron injection layer, a hole blocking layer, an electron transport layer, a hole transport layer, an electron blocking layer, and a hole injection layer.

[0210] In some embodiments, as shown in FIG5 , the driving circuit layer 7 includes a pixel driving circuit that corresponds one-to-one with the light emitting device 9 and drives the light emitting device 9 to emit light; the pixel driving circuit includes, for example, a thin film transistor TFT and a capacitor (not shown).

[0211] It should be noted that, in FIG5 , a thin film transistor TFT is illustrated as a top gate structure, that is, the gate G is located on the side of the active layer 701 away from the base substrate 1; the multilayer insulating layer 4 includes: a first buffer layer 401 located between the base substrate 1 and the active layer 701, a first gate insulating layer 402 located between the gate G and the active layer 701, an interlayer insulating layer 403 located between the gate G and the source S and the drain D, a passivation layer 407 located between the interlayer insulating layer 403 and the source S and the drain D, and a first gate insulating layer 408 located between the source S and the drain D and the anode. a first planarization layer 404 between the anodes 901 and the pixel definition layer 408 located on the side of the anode 901 away from the substrate 1; the pixel definition layer 408 includes a plurality of opening areas 4081, the pixel definition layer 408 covers the edge of the anode 901, and the orthographic projection of the opening area 4081 on the substrate 1 falls within the orthographic projection of the anode 901 on the substrate 1; the light-emitting functional layer 902 is located on the side of the anode 901 and the pixel definition layer 408 away from the substrate 1, and the cathode 903 is located on the side of the light-emitting functional layer 902 away from the substrate 1.

[0212] In some embodiments, the anode is connected to the drain through a via hole penetrating the first planarization layer.

[0213] Alternatively, in order to avoid the risk of disconnection due to the overlap between the anode and the drain, in some embodiments, as shown in FIG5 , the touch display panel further includes a first transfer electrode 702 located between the first planarization layer 404 and the anode 901 , and a second transfer electrode 703 located between the first transfer electrode 702 and the anode 901 ;

[0214] The multilayer insulation layer 4 includes: a second planarization layer 405 located between the second transfer electrode 703 and the first transfer electrode 702, and a third planarization layer 406 located between the second transfer electrode 703 and the anode 901. The anode 901 is connected to the second transfer electrode 703 via a via hole penetrating the third planarization layer 406. The second transfer electrode 703 is electrically connected to the first transfer electrode 702 via a via hole penetrating the second planarization layer 1038. The first transfer electrode 702 is connected to the drain D via a via hole penetrating the first planarization layer 404.

[0215] In some embodiments, as shown in FIG. 13 , the multi-layer insulating layer 4 further includes a spacer layer 409 located on a side of the pixel definition layer 408 facing away from the base substrate 1 .

[0216] In some embodiments, as shown in FIG. 13 , the retaining wall 2 includes a plurality of stacked sub-layers 5 , and at least some of the sub-layers 5 are disposed on the same layer as the insulating layer 4 .

[0217] In some embodiments, as shown in FIG. 12 , the plurality of retaining walls 2 include: a first retaining wall 2 - 1 , and a second retaining wall 2 - 2 located on a side of the first retaining wall 2 - 1 away from the display area 101 .

[0218] In some embodiments, the thickness of the first region of the first retaining wall is less than or equal to the thickness of the first region of the second retaining wall; and the thickness of the second region of the first retaining wall is less than or equal to the thickness of the second region of the second retaining wall, thereby better preventing the organic encapsulation material from overflowing.

[0219] It should be noted that FIG13 illustrates an example in which the second region 202 of the first retaining wall 2-1 and the second region 202 of the second retaining wall 2-2 have the same thickness. The second region 202 of the first retaining wall 2-1 and the second region 202 of the second retaining wall 2-2 both include three sub-layers 5, namely, a first sub-layer 501, a second sub-layer 502, and a third sub-layer 503 stacked sequentially on one side of the base substrate 1.

[0220] 13 , the first sublayer 501 and the second planarization layer 406 are provided on the same layer, the second sublayer 502 and the pixel definition layer 408 are provided on the same layer, and the third sublayer 503 and the spacer 409 are provided on the same layer as an example for illustration.

[0221] Alternatively, in some embodiments, the second region of the first retaining wall may be thinner than the second region of the second retaining wall. For example, the second region of the first retaining wall may include three sublayers, namely, a first sublayer, a second sublayer, and a third sublayer, stacked sequentially on the substrate side. The second region of the second retaining wall may include four sublayers, namely, a fourth sublayer, a first sublayer, a second sublayer, and a third sublayer, stacked sequentially on the substrate side. The fourth sublayer may be disposed on the same layer as the second planarization layer. Of course, in specific implementations, the sublayer may also be disposed on the same layer as the first planarization layer.

[0222] In a specific implementation, in order to ensure that the thickness of the retaining wall is greater than or equal to 3 microns and less than or equal to 4.2 microns, the thickness of part of the insulating layer meets the following conditions:

[0223] The thickness of the first planarization layer, the thickness of the second planarization layer, and the thickness of the third planarization layer are greater than or equal to 1.5 microns and less than or equal to 1.7 microns;

[0224] The thickness of the pixel definition layer is about 0.8 microns, and the thickness of the spacer layer is about 1.5 microns.

[0225] In a specific implementation, the sub-layers of each retaining wall in the first area and the second area are the same sub-layers.

[0226] In some embodiments, the number of sublayers included in the second region is greater than the number of sublayers included in the first region. For example, the first region of the first retaining wall and the second retaining wall includes two sublayers, namely, a first sublayer and a second sublayer stacked sequentially on one side of the substrate.

[0227] It should be noted that in related art, the arrangement of multiple sublayers in a retaining wall is shown in Figures 3 and 4 , where some sublayers 5 cover the sublayers 5 below them. In Figures 3 and 4 , the second sublayer 502 covers the first sublayer 501, and in the second area 202 of the second retaining wall 2-2, the first sublayer 501 covers the fourth sublayer 504 below it. This arrangement results in a large slope angle on the side of the retaining wall, approximately 30°. When the slope angle is large, the touch signal line is more likely to break when crossing the retaining wall.

[0228] In some embodiments, as shown in Figure 13, in the direction away from the substrate 1, the width of the multiple sub-layers 5 in the extension direction perpendicular to the retaining wall 2 gradually decreases, and at least the retaining wall 2 in the second area 202 has a stepped side 19, and the stepped side 19 includes multiple steps.

[0229] The touch display panel provided by the embodiment of the present disclosure has multiple sub-layers whose widths in the direction perpendicular to the extension direction of the retaining wall gradually decrease in the direction away from the base substrate. Compared with the situation in the related art where the upper sub-layer covers the lower sub-layer, the number of steps included in the side of the retaining wall can be increased, thereby reducing the slope angle of the side of the retaining wall, avoiding the risk of the touch signal line being broken when crossing the retaining wall.

[0230] In some embodiments, as shown in FIG13 , the side surfaces of at least part of the sub-layer 5 of the second region 202 include multiple steps. This further increases the number of steps on the side surfaces of the retaining wall, thereby reducing the slope angle of the side surfaces of the retaining wall, thereby avoiding the risk of disconnection of the touch signal line when crossing the retaining wall.

[0231] In a specific implementation, the sub-layer can be patterned using a half-tone mask process so that the side of the sub-layer includes multiple steps. The half-tone mask used in the half-tone mask process corresponds to three transmittances. The mask in the area where steps need to be formed in the sub-layer is a semi-transparent film, which allows some light to pass through. Figure 13 illustrates the example of the first sub-layer including two steps. In a specific implementation, each sub-layer can include two steps, that is, each sub-layer can be patterned to further reduce the slope angle of the side of the retaining wall.

[0232] In some embodiments, the slope angle of the stepped side surface of the second region is greater than or equal to 15° and less than or equal to 20°, thereby ensuring that the slope angle of the side surface of the retaining wall is small, thereby avoiding the risk of the touch signal line being disconnected when crossing the retaining wall.

[0233] It should be noted that the slope angle of the stepped side surface of the second zone is greater than or equal to 15° and less than or equal to 20°, which means that the slope angle at any step in the stepped side surface is greater than or equal to 15° and less than or equal to 20°; the slope angle of the step refers to the angle between the step surface and the straight edge of the step, that is, a1 in Figure 13.

[0234] In some embodiments, as shown in FIG13 , the distance h2 between the orthographic projections of two adjacent steps on the base substrate 1 is greater than or equal to 15 microns and less than or equal to 20 microns. This helps reduce the slope angle of the steps and avoids the risk of disconnection of the touch signal line when it crosses the retaining wall.

[0235] In some embodiments, as shown in FIG14 , in an area overlapping with the orthographic projection of at least a portion of the second area 202 of the retaining wall 2 on the base substrate 1 , the angle between the extension direction of the touch signal line 3 and the first direction Y is greater than or equal to 10° and less than or equal to 45°.

[0236] The touch display panel provided by the embodiment of the present disclosure reduces the thickness of the retaining wall and the slope angle of the side of the retaining wall. At the same time, in the area overlapping with the orthographic projection of the second area, the touch signal line includes a first portion whose extension direction is not perpendicular to the first direction Y, that is, the first portion extends obliquely relative to the first direction Y, thereby increasing the length of the touch signal line corresponding to the unit thickness of the retaining wall, which is more conducive to avoiding the risk of the touch signal line breaking when crossing the retaining wall. If the angle θ is too small, the length of the touch signal line corresponding to the unit thickness of the retaining wall is also small, and the effect of improving the risk of breaking is small; if the angle θ is too large, it will occupy too much wiring space. The touch display panel provided by the embodiment of the present disclosure has an angle θ greater than or equal to 10° and less than or equal to 45°. While effectively increasing the length of the touch signal line corresponding to the unit thickness of the retaining wall, it can avoid excessively increasing the wiring space of the touch signal line, which is conducive to achieving a narrow frame.

[0237] It should be noted that, as shown in FIG14 , the angle θ between the extension direction of the first portion 301 of the touch signal line 3 and the first direction Y is less than or equal to 90°.

[0238] In some embodiments, as shown in Figure 14, part of the touch signal line 3 includes: a first portion 301 corresponding to the second area 202 of the first retaining wall 2-1 (marked as 301-1 in the figure in Figure 14), and a first portion 301 corresponding to the second area 202 of the second retaining wall 2-2 (marked as 301-2 in the figure in Figure 14); and an angle θ between an extension direction of the first portion 301 included in the part of the touch signal line 3 and the first direction Y is greater than or equal to 10° and less than or equal to 45°, and the extension direction of the first portion 301 corresponding to the second area 202 of the first retaining wall 2-1 and the extension direction of the first portion 301 corresponding to the second area 202 of the second retaining wall 2-2 intersect.

[0239] In the touch display panel provided by the disclosed embodiments, the first portions of some touch signal lines corresponding to the first and second retaining walls extend obliquely relative to the first direction Y. This increases the length of the touch signal lines per unit thickness of the retaining walls, further helping to avoid the risk of disconnection of the touch signal lines due to crossing over the retaining walls. Furthermore, since the first portions corresponding to the two retaining walls extend in intersecting directions, this also helps to avoid excessively increasing the space occupied by the touch signal lines in the second direction X.

[0240] In a specific implementation, as shown in FIG14 , in some touch signal lines 3, the extension direction of the first portion 301 corresponding to the second area 202 of the first retaining wall 2-1 passes through the second quadrant and the fourth quadrant of the coordinate system formed by the first direction Y and the second direction X, and the extension direction of the first portion 301 corresponding to the second area 202 of the second retaining wall 2-2 passes through the first quadrant and the third quadrant of the coordinate system formed by the first direction Y and the second direction X.

[0241] Alternatively, in some touch signal lines, the extension direction of the first portion corresponding to the second area of ​​the first retaining wall passes through the first quadrant and the third quadrant of the coordinate system formed by the first direction Y and the second direction X, and the extension direction of the first portion corresponding to the second area of ​​the second retaining wall passes through the second quadrant and the fourth quadrant of the coordinate system formed by the first direction Y and the second direction X.

[0242] In a specific implementation, according to the actual wiring space, the extension directions of the two first portions corresponding to the same retaining wall and overlapping with the orthographic projections of the second areas respectively located on both sides of the first area can be symmetrically arranged.

[0243] Alternatively, in some embodiments, as shown in FIG15 , at least part of the touch signal line 3 further includes: a second portion 302 located on a side of the first portion 301 facing the display area 101 ;

[0244] The second portion 302 extends along the first direction Y;

[0245] The orthographic projection of the second portion 302 on the base substrate 1 overlaps with the orthographic projection of the first retaining wall 2 - 1 on the base substrate 1 , and in the overlapping region with the orthographic projection of the second portion 302 on the base substrate 1 , the thickness of the first retaining wall 2 - 1 is less than or equal to 4.2 μm.

[0246] In specific implementation, the thickness of the first retaining wall is usually less than or equal to the thickness of the second retaining wall. When the thickness of the first retaining wall is less than the thickness of the second retaining wall, only the first part extending obliquely is set at the second retaining wall, and the second part perpendicular to the retaining wall is set at the first retaining wall. This can also avoid the risk of the touch signal line being broken when crossing the retaining wall, and is also beneficial to saving wiring space.

[0247] In a specific implementation, as shown in FIG15 , in some touch signal lines 3 , the extension direction of the first portion 301 corresponding to the second area 202 of the second retaining wall 2 - 2 passes through the first quadrant and the third quadrant of the coordinate system formed by the first direction Y and the second direction X.

[0248] Alternatively, the extension direction of the first portion of some touch signal lines corresponding to the second area of ​​the second retaining wall passes through the second quadrant and the fourth quadrant of the coordinate system formed by the first direction Y and the second direction X.

[0249] In specific implementation, according to actual wiring space, the extension directions of the two first portions corresponding to the same second retaining wall and overlapping with the orthographic projections of the second areas respectively located on both sides of the first area can be symmetrically arranged.

[0250] In some embodiments, the touch signal line and the first region have an overlapping portion extending along the first direction Y.

[0251] In some embodiments, the touch display panel further includes: a dummy signal line and a short bar.

[0252] In a specific implementation, if there is sufficient wiring space between two adjacent touch signal lines, a dummy signal line can be provided between the two adjacent touch signal lines. The dummy signal line is a single-layer wiring, for example, located in the second touch conductive layer.

[0253] In a specific implementation, the orthographic projection of the short-circuit line on the substrate falls within the second barrier wall. The short-circuit line extends along the second direction X and is electrically connected to multiple touch signal lines. The short-circuit line serves to maintain equal potential and reduce the probability of electrostatic discharge (ESD) from the mask used in the patterning process. The short-circuit line is equidistant from both sides of the second barrier wall, and its width is approximately 0.7 microns.

[0254] In a specific implementation, when the touch signal lines are wired in two layers, the short circuit lines are also wired in two layers.

[0255] In some embodiments, the touch signal line has a concave area at the connection between the short circuit line and the touch signal line, so that optical proximity correction (OPC) compensation can be performed on the short circuit line.

[0256] To address the problem in related technologies that a touch signal line may be easily disconnected when crossing a retaining wall, an embodiment of the present disclosure further provides a touch display panel, as shown in FIG16 . The touch display panel includes:

[0257] The base substrate 1 includes a display area 101 and a peripheral area 102 surrounding the display area 101 ; the peripheral area 102 includes a first peripheral area 1021 located on one side of the display area 101 in a first direction Y;

[0258] A plurality of retaining walls 2 are located in the peripheral area 102 ; the orthographic projections of the retaining walls 2 on the base substrate 1 surround the display area 101 ;

[0259] Multiple touch signal lines 3 are located at least in the first peripheral area 1021 and on the side of the retaining wall 2 away from the base substrate 1; in the first peripheral area 1021, in an area that overlaps with the orthographic projection of the second area 202 of the retaining wall 2 on the base substrate 1, the angle between the extension direction of at least part of the touch signal lines 3 and the first direction Y is greater than or equal to 10° and less than or equal to 45°.

[0260] The touch display panel provided by the embodiment of the present disclosure has, in an area overlapping with the orthographic projection of the retaining wall, at least part of the touch signal lines including a first portion whose extension direction is not perpendicular to the first direction Y, that is, the first portion extends obliquely relative to the first direction Y, thereby increasing the length of the touch signal line corresponding to the unit thickness of the retaining wall. Even if the thickness of the retaining wall is not reduced, the risk of the touch signal line breaking due to crossing the retaining wall can be avoided. If the angle θ is too small, the length of the touch signal line corresponding to the unit thickness of the retaining wall is also small, and the effect of improving the risk of breaking is small; if the angle θ is too large, it will occupy too much wiring space. The touch display panel provided by the embodiment of the present disclosure has an angle θ greater than or equal to 10° and less than or equal to 45°. While effectively increasing the length of the touch signal line corresponding to the unit thickness of the retaining wall, it can avoid excessively increasing the wiring space of the touch signal line, which is conducive to achieving a narrow frame.

[0261] It should be noted that, as shown in FIG16 , the angle θ between the extension direction of the first portion 301 of the touch signal line 3 and the first direction Y is an angle less than or equal to 90°.

[0262] In some embodiments, as shown in FIG16 , at least one retaining wall 2 includes: a first region 201 and a second region 202; the second region 202 has a corner 2021, and portions of the first region 201 and the second region 202 are located in the first peripheral region 1021; and in the first peripheral region 1021, the second region 202 includes portions located on opposite sides of the first region 201 in the second direction X; the first direction Y is perpendicular to the second direction X; and in a direction perpendicular to the substrate 1, the thickness of the first region 201 is less than the thickness of the second region 202;

[0263] Multiple touch signal lines 3 are located at least in the first peripheral area 1021 and on the side of the retaining wall 2 away from the base substrate 1; in the first peripheral area 1021, the orthographic projection of at least part of the multiple touch signal lines 3 on the base substrate 1 overlaps with the orthographic projection of the second area 202 on the base substrate 1, and in the area that overlaps with the orthographic projection of the second area 202 of at least part of the retaining wall 2 on the base substrate 1, the angle between the extension direction of the touch signal line 3 and the first direction Y is greater than or equal to 10° and less than or equal to 45°.

[0264] The touch display panel provided by the embodiment of the present disclosure has an area that overlaps with the orthographic projection of the second area of ​​the retaining wall, and the touch signal line includes a first portion whose extension direction is not perpendicular to the first direction Y, that is, the first portion extends obliquely relative to the first direction Y, thereby increasing the length of the touch signal line corresponding to the unit thickness of the retaining wall. Even if the thickness of the retaining wall is not reduced, the risk of the touch signal line being broken when crossing the retaining wall can be avoided.

[0265] It should be noted that the shape of the base substrate is generally the same as that of the touch display panel. In FIG16 , the base substrate 1 is rectangular, i.e., the corners of the base substrate 1 are right angles, and the corresponding corners of the retaining wall 2 are also right angles. Alternatively, the base substrate can be rectangular with rounded corners, i.e., the corners of the base substrate are rounded, and the corresponding corners of the retaining wall are also rounded.

[0266] In some embodiments, as shown in Figures 14 and 16, part of the touch signal line 3 includes: a first portion 301 corresponding to the second area 202 of the first retaining wall 2-1 (marked as 301-1 in Figures 14 and 16), and a first portion 301 corresponding to the second area 202 of the second retaining wall 2-2 (marked as 301-2 in Figures 14 and 16); and an angle θ between an extension direction of the first portion 301 included in the part of the touch signal line 3 and the first direction Y is greater than or equal to 10° and less than or equal to 45°, and the extension direction of the first portion 301 corresponding to the second area 202 of the first retaining wall 2-1 and the extension direction of the first portion 301 corresponding to the second area 202 of the second retaining wall 2-2 intersect.

[0267] In the touch display panel provided by the disclosed embodiments, the first portions of some touch signal lines corresponding to the first and second retaining walls extend obliquely relative to the first direction Y. This increases the length of the touch signal lines per unit thickness of the retaining walls, further helping to avoid the risk of disconnection of the touch signal lines due to crossing over the retaining walls. Furthermore, since the first portions corresponding to the two retaining walls extend in intersecting directions, this also helps to avoid excessively increasing the space occupied by the touch signal lines in the second direction X.

[0268] In a specific implementation, as shown in FIG14 , in some touch signal lines 3, the extension direction of the first portion 301 corresponding to the second area 202 of the first retaining wall 2-1 passes through the second quadrant and the fourth quadrant of the coordinate system formed by the first direction Y and the second direction X, and the extension direction of the first portion 301 corresponding to the second area 202 of the second retaining wall 2-2 passes through the first quadrant and the third quadrant of the coordinate system formed by the first direction Y and the second direction X.

[0269] Alternatively, as shown in Figure 16, in some touch signal lines 3, the extension direction of the first portion 301 corresponding to the second area 202 of the first retaining wall 2-1 passes through the first quadrant and the third quadrant of the coordinate system composed of the first direction Y and the second direction X, and the extension direction of the first portion 301 corresponding to the second area 202 of the second retaining wall 2-2 passes through the second quadrant and the fourth quadrant of the coordinate system composed of the first direction Y and the second direction X.

[0270] In a specific implementation, according to the actual wiring space, the extension directions of the two first portions corresponding to the same retaining wall and overlapping with the orthographic projections of the second areas respectively located on both sides of the first area can be symmetrically arranged.

[0271] Alternatively, in some embodiments, as shown in FIG15 , at least part of the touch signal line 3 further includes: a second portion 302 located on a side of the first portion 301 facing the display area 101 ;

[0272] The second portion 302 extends along the first direction Y;

[0273] The orthographic projection of the second portion 302 on the base substrate 1 overlaps with the orthographic projection of the first retaining wall 2 - 1 on the base substrate 1 , and in the overlapping region with the orthographic projection of the second portion 302 on the base substrate 1 , the thickness of the first retaining wall 2 - 1 is less than or equal to 4.2 μm.

[0274] In specific implementation, the thickness of the first retaining wall is usually less than or equal to the thickness of the second retaining wall. When the thickness of the first retaining wall is less than the thickness of the second retaining wall, only the first part extending obliquely is set at the second retaining wall, and the second part perpendicular to the retaining wall is set at the first retaining wall. This can also avoid the risk of the touch signal line being broken when crossing the retaining wall, and is also beneficial to saving wiring space.

[0275] In a specific implementation, as shown in FIG15 , in some touch signal lines 3 , the extension direction of the first portion 301 corresponding to the second area 202 of the second retaining wall 2 - 2 passes through the first quadrant and the third quadrant of the coordinate system formed by the first direction Y and the second direction X.

[0276] Alternatively, the extension direction of the first portion of some touch signal lines corresponding to the second area of ​​the second retaining wall passes through the second quadrant and the fourth quadrant of the coordinate system formed by the first direction Y and the second direction X.

[0277] In specific implementation, according to actual wiring space, the extension directions of the two first portions corresponding to the same second retaining wall and overlapping with the orthographic projections of the second areas respectively located on both sides of the first area can be symmetrically arranged.

[0278] In some embodiments, the touch signal line and the first region have an overlapping portion extending along the first direction Y.

[0279] In some embodiments, as shown in FIG. 5 , the touch display panel further includes a multi-layer insulation layer 4 located between the touch signal line 3 and the base substrate 1 .

[0280] In some embodiments, as shown in Figure 5, the touch display panel further includes: a driving circuit layer 7 located on one side of the base substrate 1, a light-emitting device 9 located on the side of the driving circuit layer 7 facing away from the base substrate 1, and an encapsulation layer 10 located on the side of the encapsulation layer 10 facing away from the base substrate 1, and a touch layer 6 located on the side of the encapsulation layer 10 facing away from the base substrate 1.

[0281] The touch display panel provided in the embodiment of the present disclosure adopts the FMLOC process, that is, the touch layer is directly manufactured on the stacked light-emitting structure layer and the packaging layer, which can reduce the thickness of the touch display panel and is conducive to realizing the lightweight and thin touch display product.

[0282] 5 , the encapsulation layer 10 includes a stacked first inorganic encapsulation layer 1001, an organic encapsulation layer 1002, and a second inorganic encapsulation layer 1003. The retaining wall in the peripheral region is used to prevent the organic encapsulation material from overflowing.

[0283] In some embodiments, the thickness of the retaining wall in a direction perpendicular to the substrate is greater than or equal to 3 micrometers, thereby ensuring the retaining wall's effect of blocking overflow of the organic material.

[0284] In some embodiments, in the first peripheral area, the boundary between the first area and the second area in the second retaining wall is closer to the symmetry axis of the touch display panel parallel to the first direction Y than the boundary between the first area and the second area in the first retaining wall.

[0285] That is, in the touch display panel provided by the embodiment of the present disclosure, the cut-off position of the second zone of the first retaining wall closer to the display area is earlier than the cut-off position of the second zone of the second retaining wall farther away from the display area. In this way, even if the encapsulation layer material exceeds the first retaining wall, the second zone of the second retaining wall can still prevent the encapsulation layer material from overflowing, which is beneficial to improving the manufacturing yield of the touch display panel.

[0286] In some embodiments, the absolute value of the difference between the distance between the boundary between the first area and the second area in the second retaining wall and the symmetry axis of the touch display panel parallel to the first direction Y and the distance between the boundary between the first area and the second area in the first retaining wall and the symmetry axis of the touch display panel parallel to the first direction Y is greater than or equal to 100 microns and less than or equal to 200 microns.

[0287] In a specific implementation, the touch layer includes a plurality of touch electrodes and a plurality of touch signal lines.

[0288] In some embodiments, as shown in Figure 5, the touch layer 6 specifically includes: a second buffer layer 601 located on the side of the encapsulation layer 10 facing away from the base substrate 1, a first touch conductive layer 602 located on the side of the second buffer layer 601 facing away from the base substrate 1, a touch insulating layer 603 located on the side of the first touch conductive layer 602 facing away from the base substrate 1, a second touch conductive layer 604 located on the side of the touch insulating layer 603 facing away from the base substrate 1, and a protective layer 605 located on the side of the second touch conductive layer 604 facing away from the base substrate 1.

[0289] In some embodiments, the first touch conductive layer and the second touch conductive layer include a metal grid structure formed by interweaving metal lines.

[0290] In some embodiments, in the display area 101 , the multi-layer touch conductive layer includes a plurality of touch electrodes. As shown in FIG6 , the plurality of touch electrodes include a plurality of first touch electrodes 11 and a plurality of second touch electrodes 12 .

[0291] The plurality of first touch electrodes 11 are arranged along the second direction X and extend along the first direction Y. The first touch electrode 201 includes a plurality of first sub-electrodes 1101 arranged along the first direction Y and a bridge electrode 1102 electrically connecting two adjacent first sub-electrodes 1101 .

[0292] The plurality of second touch electrodes 12 extend along the second direction X and are arranged along the first direction Y. The second touch electrodes 12 include a plurality of second sub-electrodes 1201 arranged along the second direction X.

[0293] In some embodiments, as shown in FIG6 , the first sub-electrode 1101 and the second sub-electrode 1201 are located in the second touch conductive layer 604 , and the bridging electrode 1102 is located in the first touch conductive layer 602 ; in a specific implementation, the bridging electrode 1102 is electrically connected to the first sub-electrode 1101 through a via hole penetrating the touch insulating layer.

[0294] In some embodiments, the touch traces are located in the first touch conductive layer or the second touch conductive layer.

[0295] Alternatively, in some embodiments, the touch trace includes a first sub-trace located in a first touch conductive layer and a second sub-trace located in a second touch conductive layer; the second sub-trace is electrically connected to the first sub-trace via a via penetrating the touch insulating layer. This means that the touch trace is arranged in two layers. By connecting the first and second sub-trace in parallel, the impedance of the touch trace can be reduced.

[0296] In some embodiments, as shown in FIG16 , the first peripheral area 1021 further includes a binding area 15 located on a side of the plurality of retaining walls 2 away from the display area 101 ;

[0297] The touch display panel further includes a plurality of first binding electrodes 14 located in the binding area; the plurality of first binding electrodes 14 are used to be bound to a driver chip (not shown);

[0298] One end of the touch signal line 3 is electrically connected to the first binding electrode 14 , and the other end of the touch signal line 3 is electrically connected to a touch electrode (not shown).

[0299] In some embodiments, as shown in FIG5 , the light-emitting device 9 includes an anode 901 , a light-emitting functional layer 902 , and a cathode 903 that are stacked.

[0300] In a specific implementation, if the light-emitting device is an organic light-emitting diode, the light-emitting functional layer includes at least an organic light-emitting layer, and may also include at least one of the following: an electron injection layer, a hole blocking layer, an electron transport layer, a hole transport layer, an electron blocking layer, and a hole injection layer.

[0301] In some embodiments, as shown in FIG5 , the driving circuit layer 7 includes a pixel driving circuit that corresponds one-to-one with the light emitting device 9 and drives the light emitting device 9 to emit light; the pixel driving circuit includes, for example, a thin film transistor TFT and a capacitor (not shown).

[0302] It should be noted that, in FIG5 , a thin film transistor TFT is illustrated as a top gate structure, that is, the gate G is located on the side of the active layer 701 away from the base substrate 1; the multilayer insulating layer 4 includes: a first buffer layer 401 located between the base substrate 1 and the active layer 701, a first gate insulating layer 402 located between the gate G and the active layer 701, an interlayer insulating layer 403 located between the gate G and the source S and the drain D, a passivation layer 407 located between the interlayer insulating layer 403 and the source S and the drain D, and a first gate insulating layer 408 located between the source S and the drain D and the anode. a first planarization layer 404 between the anodes 901 and the pixel definition layer 408 located on the side of the anode 901 away from the substrate 1; the pixel definition layer 408 includes a plurality of opening areas 4081, the pixel definition layer 408 covers the edge of the anode 901, and the orthographic projection of the opening area 4081 on the substrate 1 falls within the orthographic projection of the anode 901 on the substrate 1; the light-emitting functional layer 902 is located on the side of the anode 901 and the pixel definition layer 408 away from the substrate 1, and the cathode 903 is located on the side of the light-emitting functional layer 902 away from the substrate 1.

[0303] In some embodiments, the anode is connected to the drain through a via hole penetrating the first planarization layer.

[0304] Alternatively, in order to avoid the risk of disconnection due to the overlap between the anode and the drain, in some embodiments, as shown in FIG5 , the touch display panel further includes a first transfer electrode 702 located between the first planarization layer 404 and the anode 901 , and a second transfer electrode 703 located between the first transfer electrode 702 and the anode 901 ;

[0305] The multilayer insulation layer 4 includes: a second planarization layer 405 located between the second transfer electrode 703 and the first transfer electrode 702, and a third planarization layer 406 located between the second transfer electrode 703 and the anode 901. The anode 901 is connected to the second transfer electrode 703 via a via hole penetrating the third planarization layer 406. The second transfer electrode 703 is electrically connected to the first transfer electrode 702 via a via hole penetrating the second planarization layer 1038. The first transfer electrode 702 is connected to the drain D via a via hole penetrating the first planarization layer 404.

[0306] In some embodiments, as shown in FIG. 3 and FIG. 13 , the multi-layer insulating layer 4 further includes a spacer layer 409 located on a side of the pixel definition layer 408 facing away from the base substrate 1 .

[0307] In some embodiments, as shown in FIG. 3 , FIG. 4 , and FIG. 13 , the retaining wall 2 includes a plurality of stacked sub-layers 5 , and at least some of the sub-layers 5 are disposed on the same layer as the insulating layer 4 .

[0308] It should be noted that the cross-sectional views of the retaining wall 2 in FIG. 14 to FIG. 16 may also adopt the arrangement manner as shown in FIG. 3 , FIG. 4 , and FIG. 13 .

[0309] In some embodiments, as shown in FIG. 16 , the plurality of retaining walls 2 include: a first retaining wall 2 - 1 , and a second retaining wall 2 - 2 located on a side of the first retaining wall 2 - 1 away from the display area 101 .

[0310] In some embodiments, the thickness of the first region of the first retaining wall is less than or equal to the thickness of the first region of the second retaining wall; and the thickness of the second region of the first retaining wall is less than or equal to the thickness of the second region of the second retaining wall, thereby better preventing the organic encapsulation material from overflowing.

[0311] It should be noted that FIG13 illustrates an example in which the second region 202 of the first retaining wall 2-1 and the second region 202 of the second retaining wall 2-2 have the same thickness. The second region 202 of the first retaining wall 2-1 and the second region 202 of the second retaining wall 2-2 both include three sub-layers 5, namely, a first sub-layer 501, a second sub-layer 502, and a third sub-layer 503 stacked sequentially on one side of the base substrate 1.

[0312] 13 , the first sublayer 501 and the second planarization layer 406 are provided on the same layer, the second sublayer 502 and the pixel definition layer 408 are provided on the same layer, and the third sublayer 503 and the spacer 409 are provided on the same layer as an example for illustration.

[0313] Alternatively, in some embodiments, the second region of the first retaining wall may be thinner than the second region of the second retaining wall. For example, as shown in FIG3 , the second region 202 of the first retaining wall 2-1 includes three sub-layers 5, namely, a first sub-layer 501, a second sub-layer 502, and a third sub-layer 503, which are stacked sequentially on one side of the base substrate 1. The second region 202 of the second retaining wall 2-2 includes four sub-layers, namely, a fourth sub-layer 504, a first sub-layer 501, a second sub-layer 502, and a third sub-layer 503, which are stacked sequentially on one side of the base substrate 1. FIG3 illustrates an example in which the first sub-layer 501 is disposed on the same layer as the second planarization layer 406, the second sub-layer 502 is disposed on the same layer as the pixel definition layer 408, the third sub-layer 503 is disposed on the same layer as the spacer 409, and the fourth sub-layer 504 is disposed on the same layer as the first planarization layer 405. In some embodiments, as shown in Figure 4, the first area 201 of the first retaining wall 2-1 includes two sub-layers 5, namely, a first sub-layer 501 and a second sub-layer 502 stacked in sequence on one side of the base substrate 1; the first area 201 of the second retaining wall 2-2 includes two sub-layers 5, namely, a first sub-layer 501 and a second sub-layer 502 stacked in sequence on one side of the base substrate 1.

[0314] Of course, in specific implementation, the sub-layer can also be provided on the same layer as the first planarization layer.

[0315] In a specific implementation, the sub-layers of each retaining wall in the first area and the second area are the same sub-layers.

[0316] In some embodiments, the number of sublayers included in the second region is greater than the number of sublayers included in the first region. For example, the first region of the first retaining wall and the second retaining wall includes two sublayers, namely, a first sublayer and a second sublayer stacked sequentially on one side of the substrate.

[0317] In some embodiments, the arrangement of multiple sublayers in the retaining wall is shown in Figures 3 and 4, and some sublayers 5 cover the sublayer 5 below it. In Figures 3 and 4, the second sublayer 502 covers the first sublayer 501, and the first sublayer 501 in the second area 202 of the second retaining wall 2-2 covers the fourth sublayer 504 below it.

[0318] Alternatively, in some embodiments, as shown in Figure 13, in the direction away from the substrate 1, the width of the multiple sub-layers 5 in the extension direction perpendicular to the retaining wall 2 gradually decreases, and at least the retaining wall 2 in the second area 202 has a stepped side 19, and the stepped side 19 includes multiple steps.

[0319] The touch display panel provided by the embodiment of the present disclosure has multiple sub-layers whose widths in the direction perpendicular to the extension direction of the retaining wall gradually decrease in the direction away from the base substrate. Compared with the situation in the related art where the upper sub-layer covers the lower sub-layer, the number of steps included in the side of the retaining wall can be increased, thereby reducing the slope angle of the side of the retaining wall, avoiding the risk of the touch signal line being broken when crossing the retaining wall.

[0320] In some embodiments, as shown in FIG13 , the side surfaces of at least part of the sub-layer 5 of the second region 202 include multiple steps. This further increases the number of steps on the side surfaces of the retaining wall, thereby reducing the slope angle of the side surfaces of the retaining wall, thereby avoiding the risk of disconnection of the touch signal line when crossing the retaining wall.

[0321] In a specific implementation, the sub-layer can be patterned using a half-tone mask process so that the side of the sub-layer includes multiple steps. The half-tone mask used in the half-tone mask process corresponds to three transmittances. The mask in the area where steps need to be formed in the sub-layer is a semi-transparent film, which allows some light to pass through. Figure 13 illustrates the example of the first sub-layer including two steps. In a specific implementation, each sub-layer can include two steps, that is, each sub-layer can be patterned to further reduce the slope angle of the side of the retaining wall.

[0322] In some embodiments, the slope angle of the stepped side surface of the second region is greater than or equal to 15° and less than or equal to 20°, thereby ensuring that the slope angle of the side surface of the retaining wall is small, thereby avoiding the risk of the touch signal line being disconnected when crossing the retaining wall.

[0323] It should be noted that the slope angle of the stepped side surface of the second zone is greater than or equal to 15° and less than or equal to 20°, which means that the slope angle at any step in the stepped side surface is greater than or equal to 15° and less than or equal to 20°; the slope angle of the step refers to the angle between the step surface and the straight edge of the step, that is, a1 in Figure 13.

[0324] In some embodiments, as shown in FIG13 , the distance h2 between the orthographic projections of two adjacent steps on the base substrate 1 is greater than or equal to 15 microns and less than or equal to 20 microns. This helps reduce the slope angle of the steps and avoids the risk of disconnection of the touch signal line when it crosses the retaining wall.

[0325] In some embodiments, the touch display panel further includes: a dummy signal line and a short bar.

[0326] In a specific implementation, if there is sufficient wiring space between two adjacent touch signal lines, a dummy signal line can be provided between the two adjacent touch signal lines. The dummy signal line is a single-layer wiring, for example, located in the second touch conductive layer.

[0327] In a specific implementation, the orthographic projection of the short-circuit line on the substrate falls within the second barrier wall. The short-circuit line extends along the second direction X and is electrically connected to multiple touch signal lines. The short-circuit line serves to maintain equal potential and reduce the probability of electrostatic discharge (ESD) from the mask used in the patterning process. The short-circuit line is equidistant from both sides of the second barrier wall, and its width is approximately 0.7 microns.

[0328] In a specific implementation, when the touch signal lines are wired in two layers, the short circuit lines are also wired in two layers.

[0329] In some embodiments, the touch signal line has a concave area at the connection between the short circuit line and the touch signal line, so that optical proximity correction (OPC) compensation can be performed on the short circuit line.

[0330] Based on the same inventive concept, an embodiment of the present disclosure further provides a display device, which includes: the above-mentioned touch display panel provided by an embodiment of the present disclosure.

[0331] The display device provided in the embodiments of the present disclosure is any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system. Other essential components of the display device are well understood by those skilled in the art and are not described here in detail, nor should they be construed as limitations of the present disclosure. The implementation of the display device can be referenced to the above-described display panel embodiments, and any repetitive details will not be repeated.

[0332] In summary, the touch display panel and display device provided by the embodiments of the present disclosure have the following advantages: in the first peripheral region, the orthographic projection of the touch signal line on the substrate overlaps with the orthographic projection of the first region, which is thinner than the second region, on the substrate; and the orthographic projection of the touch signal line on the substrate does not overlap with the orthographic projection of the second region of the retaining wall on the substrate. That is, in the first peripheral region, the touch signal line does not overlap with the thicker region of the retaining wall. This prevents the touch signal line from breaking when crossing the thicker region of the retaining wall, thereby improving the yield of the touch display panel. Alternatively, the thickness of the second region of the retaining wall is less than or equal to 4.2 microns, thereby avoiding the risk of touch signal line breaking even when the touch signal line crosses the second region of the retaining wall. Alternatively, in the region that overlaps with the orthographic projection of the second region, the touch signal line includes a first portion that extends in a direction that is not perpendicular to the first direction Y, i.e., the first portion extends obliquely with respect to the first direction Y. This increases the length of the touch signal line per unit thickness of the retaining wall, thus avoiding the risk of touch signal line breaking when crossing the retaining wall, even without reducing the thickness of the retaining wall. If the angle θ is too small, the length of the touch signal line corresponding to the unit thickness of the retaining wall is also small, and the effect of reducing the risk of line breakage is small. If the angle θ is too large, it will occupy too much wiring space. The touch display panel provided by the embodiment of the present disclosure has an angle θ greater than or equal to 10° and less than or equal to 45°. This can effectively increase the length of the touch signal line corresponding to the unit thickness of the retaining wall while avoiding excessive increase in the wiring space of the touch signal line, which is conducive to achieving a narrow bezel.

[0333] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0334] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if such changes and modifications of the embodiments of the present invention fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A touch display panel, wherein: The touch display panel includes: A base substrate, comprising a display area and a peripheral area surrounding the display area; the peripheral area comprises a first peripheral area located on one side of the display area in a first direction; A plurality of retaining walls are located in the peripheral area; the retaining walls surround the display area in an orthographic projection of the base substrate; at least one of the retaining walls includes: a first area and a second area; portions of the first area and the second area are located in the first peripheral area; and in the first peripheral area, the second area includes portions located on opposite sides of the first area in a second direction; the first direction is perpendicular to the second direction; and in a direction perpendicular to the base substrate, a thickness of at least a portion of the first area is less than a thickness of the second area; A plurality of touch signal lines are located at least in the first peripheral area and on a side of the retaining wall away from the base substrate; in the first peripheral area, an orthographic projection of at least some of the plurality of touch signal lines on the base substrate overlaps with an orthographic projection of the first area having a thickness less than that of the second area on the base substrate, and the orthographic projection of the plurality of touch signal lines on the base substrate does not overlap with an orthographic projection of the second area of ​​the retaining wall on the base substrate.

2. The touch display panel according to claim 1, wherein: The first region extends along the second direction, and the second region has a corner; in a direction perpendicular to the substrate, a thickness of the first region is smaller than a thickness of the second region; The orthographic projections of the plurality of touch signal lines on the base substrate overlap with the orthographic projection of the first region on the base substrate.

3. The touch display panel according to claim 2, wherein: An extension direction of at least a portion of the touch signal line intersects with an extension direction of the first area; A distance between an orthographic projection of the touch signal line closest to the second area on the base substrate and an orthographic projection of the second area on the base substrate is greater than or equal to 3 micrometers.

4. The touch display panel according to claim 3, wherein: A distance between an orthographic projection of the touch signal line closest to the second area on the base substrate and an orthographic projection of the second area on the base substrate is greater than or equal to 20 micrometers and less than or equal to 100 micrometers.

5. The touch display panel according to any one of claims 2 to 4, wherein: The touch display panel further includes: a multi-layer insulation layer located between the touch signal line and the base substrate; The retaining wall comprises a plurality of stacked sub-layers, at least some of which are arranged on the same layer as the insulating layer; The number of the sub-layers included in the second region is greater than the number of the sub-layers included in the first region.

6. The touch display panel according to any one of claims 2 to 5, wherein: The plurality of retaining walls include: a first retaining wall, and a second retaining wall located on a side of the first retaining wall away from the display area; In the first peripheral area, a boundary between the first area and the second area in the second retaining wall is closer to a symmetry axis of the touch display panel parallel to the first direction than a boundary between the first area and the second area in the first retaining wall.

7. The touch display panel according to claim 1, wherein: The first area extends along the second direction, and the second area has a corner; The first region includes: a plurality of first sub-regions and a plurality of second sub-regions; in the second direction, the first sub-regions and the second sub-regions are alternately arranged; in a direction perpendicular to the substrate, the thickness of the first sub-regions is smaller than the thickness of the second sub-regions, and the thickness of the first sub-regions is smaller than the thickness of the second region; The orthographic projection of the touch signal line on the base substrate overlaps with the orthographic projection of the first sub-region on the base substrate, and the orthographic projection of the touch signal line on the base substrate does not overlap with the orthographic projection of the second sub-region on the base substrate.

8. The touch display panel according to claim 7, wherein: Part of the first sub-areas corresponds to one of the touch signal lines.

9. The touch display panel according to claim 8, wherein: A distance between an orthographic projection of a boundary between the first sub-region and the second sub-region on the substrate and an edge of the orthographic projection of the touch signal line closest to the boundary on the substrate is greater than or equal to 3 micrometers and less than or equal to 5 micrometers; And / or, the distance between the orthographic projection of the substrate at the boundary between the first sub-region and the second region and the edge of the orthographic projection of the substrate closest to the boundary is greater than or equal to 3 microns and less than or equal to 5 microns.

10. The touch display panel according to any one of claims 7 to 9, wherein: In each of the retaining walls, a thickness of the second sub-region in a direction perpendicular to the base substrate is equal to a thickness of the second area in a direction perpendicular to the base substrate.

11. The touch display panel according to any one of claims 7 to 10, wherein: The touch display panel further includes: a multi-layer insulation layer located between the touch signal line and the base substrate; The retaining wall comprises a plurality of stacked sub-layers, at least some of which are arranged on the same layer as the insulating layer; The number of sub-layers included in the first sub-region is smaller than the number of sub-layers included in the second sub-region, and the number of sub-layers included in the first sub-region is smaller than the number of sub-layers included in the second region.

12. The touch display panel according to any one of claims 7 to 11, wherein: The number and type of the sub-layers included in the second sub-region are the same as the number and type of the sub-layers included in the second region.

13. The touch display panel according to any one of claims 7 to 12, wherein: The touch signal line includes a first portion corresponding to the first sub-region, and the first portion extends along the first direction.

14. The touch display panel according to any one of claims 7 to 12, wherein: The touch signal line includes a first portion corresponding to the first sub-area; An angle between an extension direction of the first portion of at least some of the touch signal lines and the first direction is greater than or equal to 10° and less than or equal to 45°.

15. The touch display panel according to claim 14, wherein: The plurality of retaining walls include: a first retaining wall, and a second retaining wall located on a side of the first retaining wall away from the display area; Part of the touch signal line includes: a first portion corresponding to the first sub-region of the first retaining wall, and a first portion corresponding to the first sub-region of the second retaining wall; and the part An angle between an extension direction of the first portion of the touch signal line and the first direction is greater than or equal to 10° and less than or equal to 45°, and an extension direction of the first portion corresponding to the first sub-region of the first retaining wall intersects with an extension direction of the first portion corresponding to the first sub-region of the second retaining wall.

16. The touch display panel according to claim 14, wherein: The plurality of retaining walls include: a first retaining wall, and a second retaining wall located on a side of the first retaining wall away from the display area; At least part of the touch signal line further includes: a second portion located on a side of the first portion facing the display area; The second portion extends along the first direction; The orthographic projection of the second portion on the base substrate overlaps with the orthographic projection of the first retaining wall on the base substrate, and in the area overlapping with the orthographic projection of the second portion on the base substrate, the thickness of the first retaining wall is less than or equal to 4.2 microns.

17. A touch display panel, wherein: The touch display panel includes: A base substrate, comprising a display area and a peripheral area surrounding the display area; the peripheral area comprises a first peripheral area located on one side of the display area in a first direction; A plurality of retaining walls are located in the peripheral area; the retaining walls surround the display area in an orthographic projection of the base substrate; at least one of the retaining walls includes: a first area and a second area; the second area has a corner, and portions of the first area and the second area are located in the first peripheral area; and in the first peripheral area, the second area includes portions located on opposite sides of the first area in a second direction; the first direction is perpendicular to the second direction; and in a direction perpendicular to the base substrate, a thickness of the first area is less than a thickness of the second area; A plurality of touch signal lines are located at least in the first peripheral area and on a side of the retaining wall away from the base substrate; in the first peripheral area, an orthographic projection of at least some of the plurality of touch signal lines on the base substrate overlaps with an orthographic projection of the second area on the base substrate, and in an area that overlaps with the orthographic projection of the touch signal lines on the base substrate, a thickness of the second area in a direction perpendicular to the base substrate is less than or equal to 4.2 microns.

18. The touch display panel according to claim 17, wherein: The touch display panel further includes: a multi-layer insulation layer located between the touch signal line and the base substrate; The retaining wall comprises a plurality of stacked sub-layers, at least some of which are arranged on the same layer as the insulating layer; In a direction away from the base substrate, the widths of the multiple sub-layers in a direction perpendicular to the extending direction of the retaining wall gradually decrease, and at least the retaining wall in the second region has a stepped side surface including multiple steps.

19. The touch display panel according to claim 18, wherein: Side surfaces of at least some sublayers of the second region include multiple steps.

20. The touch display panel according to claim 18 or 19, wherein: The slope angle of the stepped side surface of the second region is greater than or equal to 15° and less than or equal to 20°.

21. The touch display panel according to any one of claims 18 to 20, wherein: The distance between the orthographic projections of two adjacent steps on the substrate is greater than or equal to 15 micrometers and less than or equal to 20 micrometers.

22. The touch display panel according to any one of claims 17 to 21, wherein: In a region overlapping with an orthographic projection of at least a portion of the second region of the retaining wall on the base substrate, an angle between an extending direction of the touch signal line and the first direction is greater than or equal to 10° and less than or equal to 45°.

23. A touch display panel, wherein: The touch display panel includes: A base substrate, comprising a display area and a peripheral area surrounding the display area; the peripheral area comprises a first peripheral area located on one side of the display area in a first direction; A plurality of retaining walls are located in the peripheral area; the retaining walls surround the display area when projected onto the base substrate; A plurality of touch signal lines are located at least in the first peripheral area and on a side of the retaining wall away from the base substrate; in the first peripheral area, in an area overlapping with the orthographic projection of the retaining wall on the base substrate, an angle between an extension direction of at least part of the touch signal lines and the first direction is greater than or equal to 10° and less than or equal to 45°.

24. The touch display panel according to claim 23, wherein: At least one of the retaining walls includes: a first region and a second region; portions of the first region and the second region are located in the first peripheral region; and in the first peripheral region, the second region includes portions located on opposite sides of the first region in a second direction; the first direction is perpendicular to the second direction; and in a direction perpendicular to the substrate, a thickness of the first region is less than a thickness of the second region; In the first peripheral area, the orthographic projection of at least part of the multiple touch signal lines on the substrate overlaps with the orthographic projection of the second area on the substrate, and in the area that overlaps with the orthographic projection of the second area of ​​at least part of the retaining wall on the substrate, the angle between the extension direction of the touch signal line and the first direction is greater than or equal to 10° and less than or equal to 45°.

25. The touch display panel according to claim 24, wherein: The plurality of retaining walls include: a first retaining wall, and a second retaining wall located on a side of the first retaining wall away from the display area; Part of the touch signal line includes: a first portion corresponding to the second area of ​​the first blocking wall, and a first portion corresponding to the second area of ​​the second blocking wall; and the angle between the extension direction of the first portion of the touch signal line and the first direction is greater than or equal to 10° and less than or equal to 45°, and the extension direction of the first portion corresponding to the second area of ​​the first blocking wall intersects with the extension direction of the first portion corresponding to the second area of ​​the second blocking wall.

26. The touch display panel according to claim 24, wherein: The plurality of retaining walls include: a first retaining wall, and a second retaining wall located on a side of the first retaining wall away from the display area; At least part of the touch signal line further includes: a second portion located on a side of the first portion facing the display area; The second portion extends along the first direction; The orthographic projection of the second portion on the base substrate overlaps with the orthographic projection of the first retaining wall on the base substrate, and in the area overlapping with the orthographic projection of the second portion on the base substrate, the thickness of the first retaining wall is less than or equal to 4.2 microns.

27. A display device, wherein: The display device comprises: a touch display panel according to any one of claims 1 to 26.

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