CN217521581U - Touch display panel and display device - Google Patents

Abstract

A touch display panel and a display device are provided. The touch display panel includes: the substrate comprises a display area and a peripheral area at least positioned on at least one side of the display area; a plurality of pixel units disposed in the display region, the pixel units including a pixel driving circuit and a light emitting element electrically connected to the pixel driving circuit, the light emitting element including a first electrode; a plurality of touch electrodes disposed in the display area; the touch wire is electrically connected with the at least one touch electrode, and at least one part of the touch wire extends to the peripheral area; the touch lead is arranged in the peripheral area, and the touch lead and the touch routing are positioned in different conductive layers; and the contact groove is positioned in the peripheral area, the touch wire is contacted with the touch lead in the contact groove, the touch wire is provided with a first touch wire part positioned in the contact groove, the substrate base plate is provided with an upper surface close to the pixel unit, and the first touch wire part obliquely extends relative to the upper surface of the substrate base plate.

Description

Touch display panel and display device

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a touch display panel and a display device.

Background

Organic electroluminescent (OLED) display devices are organic electroluminescent diode-based display devices. The flexible panel has the excellent characteristics of self-luminescence, high contrast, thin thickness, wide visual angle, high response speed, wide use temperature range, simpler structure and process and the like, can be used for flexible panels, receives more and more attention and has wide application prospect. In the related art, a touch function is integrated by embedding a touch structure in an OLED display module, so that the display function and the touch function of the OLED display device are integrated.

With the development of the technology, the application of the OLED display device with a narrow bezel is more and more widespread. Reducing the frame width of the OLED display device is one of the important issues for research and development personnel in the related art.

The above information disclosed in this section is only for the understanding of the background of the technical idea of the present disclosure, and thus, the above information may contain information that does not constitute prior art.

SUMMERY OF THE UTILITY MODEL

In one aspect, there is provided a touch display panel including:

the display device comprises a substrate base plate, a display panel and a display panel, wherein the substrate base plate comprises a display area and a peripheral area at least positioned on at least one side of the display area;

a plurality of pixel units disposed in the display region, the pixel units including a pixel driving circuit and a light emitting element electrically connected to the pixel driving circuit, the light emitting element including a first electrode;

a plurality of touch electrodes disposed in the display area;

the touch wire is electrically connected with at least one touch electrode, and at least one part of the touch wire extends to the peripheral area;

the touch lead is arranged in the peripheral area, and the touch lead and the touch routing are positioned in different conductive layers;

a contact slot located in the peripheral region, the touch trace being in contact with the touch lead in the contact slot,

the touch trace is provided with a first touch trace part positioned in the contact groove, the substrate base plate is provided with an upper surface close to the pixel unit, and the first touch trace part obliquely extends relative to the upper surface of the substrate base plate.

According to some exemplary embodiments, the first touch trace portion is located on a bottom of the contact groove.

According to some exemplary embodiments, the touch lead has a first touch lead portion and a second touch lead portion, the second touch lead portion forms a groove bottom of the contact groove, the first touch lead portion is located at a side of the second touch lead portion close to the display area, the first touch lead portion extends in parallel with respect to an upper surface of the substrate base, and the second touch lead portion extends obliquely with respect to the upper surface of the substrate base.

According to some exemplary embodiments, the first touch trace portion is located on a groove sidewall of the contact groove.

According to some exemplary embodiments, the touch lead has a first touch lead portion, a second touch lead portion and a fourth touch lead portion, the second touch lead portion forms a bottom of the contact groove, the fourth touch lead portion forms a portion of a groove sidewall of the contact groove, the first touch lead portion is located at a side of the second touch lead portion close to the display area, and the fourth touch lead portion is located between the first touch lead portion and the second touch lead portion; the first touch lead portion extends in parallel with respect to the upper surface of the substrate base, the second touch lead portion extends in parallel with respect to the upper surface of the substrate base, and the fourth touch lead portion extends obliquely with respect to the upper surface of the substrate base; and the first touch routing part is in contact with the fourth touch lead part.

According to some exemplary embodiments, the touch trace further has a second touch trace portion located in the contact groove, and the second touch trace portion is in contact with the second touch lead portion.

According to some exemplary embodiments, a width of the contact portion between the first touch trace portion and the second touch lead portion along the extending direction of the first touch trace portion is equal to a width of the contact groove along the extending direction of the first touch trace portion.

According to some exemplary embodiments, a width of the contact portion between the second touch trace portion and the second touch lead portion along the extending direction of the second touch trace portion is equal to a width of the contact groove along the extending direction of the second touch trace portion.

According to some exemplary embodiments, the touch display panel further comprises a first support structure comprising a first surface remote from the substrate base, the first surface having a first portion, an orthographic projection of the contact groove on the substrate base substantially coinciding with an orthographic projection of the first portion of the first surface on the substrate base; a first portion of the first surface extends obliquely relative to an upper surface of the substrate base.

According to some exemplary embodiments, the first portion of the first surface has a first end close to the display area and a second end far from the display area, and a height of the first portion of the first surface at the second end is smaller than a height of the first portion of the first surface at the first end.

According to some exemplary embodiments, a height difference of the first portion of the first surface between the first end and the second end is between 0.5 and 50 micrometers.

According to some exemplary embodiments, the second touch lead portion is in direct contact with the first portion of the first surface.

According to some exemplary embodiments, the touch display panel further includes a first support structure, and the fourth touch lead portion is located on a sidewall of the first support structure away from the display area.

According to some exemplary embodiments, the first support structure comprises a first surface remote from the substrate base plate, the first surface having a first portion, the first portion of the first surface extending obliquely with respect to an upper surface of the substrate base plate; the fourth touch lead portion is in contact with the first portion of the first surface.

According to some exemplary embodiments, the first surface further has a second portion located at a side of the first portion of the first surface close to the display area, the second portion of the first surface extending in parallel with respect to an upper surface of the substrate base plate.

According to some exemplary embodiments, the touch display panel further comprises a second support structure located on a side of the first support structure remote from the substrate base plate, an orthographic projection of the second support structure on the substrate base plate at least partially overlapping an orthographic projection of a second portion of the first surface on the substrate base plate; and a portion of the first touch lead portion is sandwiched between the first support structure and the second support structure.

According to some exemplary embodiments, the touch display panel further includes a first encapsulation sublayer, a second encapsulation sublayer and a third encapsulation sublayer disposed away from the substrate base plate in sequence; the touch display panel further comprises a first covering structure positioned in the peripheral area, and the first covering structure is positioned in at least one of the first packaging sub-layer and the third packaging sub-layer; and the orthographic projection of the side face, far away from the display area, of the first covering structure on the substrate falls into the orthographic projection of the second part of the first surface on the substrate.

According to some exemplary embodiments, the first touch lead portion is in direct contact with the second portion of the first surface.

According to some exemplary embodiments, the light emitting element further includes a second electrode and a light emitting layer disposed between the first electrode and the second electrode, the pixel driving circuit includes a storage capacitor and at least one thin film transistor disposed on the substrate, the thin film transistor includes an active layer, a gate electrode, a source electrode and a drain electrode, the storage capacitor includes a first plate and a second plate;

wherein, the touch display panel includes:

the first conducting layer is arranged on one side, away from the substrate, of the active layer, and the grid electrode and the first polar plate are located on the first conducting layer;

the second conducting layer is arranged on one side, away from the substrate, of the first conducting layer, and the second pole plate is located on the second conducting layer;

the third conducting layer is arranged on one side, away from the substrate, of the second conducting layer, and the source electrode and the drain electrode are located on the third conducting layer;

a fourth conductive layer disposed on a side of the third conductive layer away from the substrate base plate, a connection portion for electrically connecting the pixel driving circuit and the first electrode of the light emitting element being located in the fourth conductive layer,

wherein the touch lead is located on the fourth conductive layer.

According to some exemplary embodiments, the touch display panel further includes: the first touch layer is positioned on the third packaging sub-layer and far away from the substrate base plate; and the second touch layer is positioned on one side of the first touch layer, which is far away from the substrate base plate, wherein the touch routing is positioned on the first touch layer or the second touch layer.

According to some exemplary embodiments, the touch display panel further includes a first planarization layer between the third conductive layer and the fourth conductive layer, and the first support structure is on the first planarization layer.

According to some exemplary embodiments, the touch display panel further includes a second planarization layer between the fourth conductive layer and the layer where the first electrode of the light emitting device is located, and the second support structure is located on the second planarization layer.

According to some exemplary embodiments, the touch display panel includes a plurality of insulating layers between the fourth conductive layer and the base substrate, and the first support structure includes a structure in at least one of the plurality of insulating layers.

According to some exemplary embodiments, the first support structure includes a first sub-support structure and a second sub-support structure, the first sub-support structure is located at the third conductive layer, and the second sub-support structure is located at the first planarization layer.

According to some exemplary embodiments, the first cover structure comprises a first portion, an orthographic projection of the first portion of the first cover structure on the substrate base plate falls within an orthographic projection of the second support structure on the substrate base plate; the first portion of the first cover structure has a first surface remote from the base substrate, the first surface of the first portion of the first cover structure extending obliquely relative to the upper surface of the base substrate.

In another aspect, a display device is provided, which includes the touch display panel as described above.

Drawings

The features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a schematic plan view of a touch display panel according to an embodiment of the present disclosure.

Fig. 2 is a schematic plan view of a touch display panel according to some exemplary embodiments of the present disclosure, in which touch electrodes and touch traces are schematically illustrated.

Fig. 3 is a cross-sectional view of the touch display panel taken along line AA' in fig. 1, schematically illustrating a bent state of the touch display panel, according to an embodiment of the present disclosure.

Fig. 4 is a cross-sectional view of the touch display panel according to an embodiment of the present disclosure, taken along a line BB' in fig. 1, schematically illustrating an unfolded state of the touch display panel.

Fig. 5 is a partially enlarged view of a portion I in fig. 2.

Fig. 6 is a cross-sectional view of the touch display panel taken along line CC' in fig. 5 according to an embodiment of the present disclosure.

Fig. 7 is a cross-sectional view of the touch display panel taken along a line DD' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel in a display area, according to an embodiment of the present disclosure.

Fig. 8 is a cross-sectional view of the touch display panel taken along a line FF' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel extending from the display area to the peripheral area, according to an embodiment of the present disclosure.

Fig. 9 is a cross-sectional view of the touch display panel taken along a line FF' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel during a process of forming an encapsulation layer and a touch layer, according to an embodiment of the present disclosure.

Fig. 10 schematically shows a schematic diagram comparing the oblique extension and the horizontal extension of the contact portion of the touch trace with the touch lead.

Fig. 11 is a cross-sectional view of a touch display panel according to other exemplary embodiments of the present disclosure, taken along line FF' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel extending from a display area to a peripheral area.

Fig. 12 is a cross-sectional view of a touch display panel according to some exemplary embodiments of the present disclosure, taken along line FF' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel extending from a display area to a peripheral area.

Fig. 13 is a cross-sectional view of a touch display panel according to other embodiments of the present disclosure, taken along line FF' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel extending from a display area to a peripheral area.

Fig. 14A is a schematic plan view of a touch display panel according to an embodiment of the present disclosure, schematically showing a planar arrangement of blocking dams located in a peripheral region of four sides of the touch display panel.

Fig. 14B schematically shows a planar arrangement of the blocking dam in the peripheral region on the lower side of the touch display panel.

Fig. 15A is a schematic plan view of a touch display panel according to further embodiments of the present disclosure, which schematically illustrates a planar arrangement of blocking dams located in peripheral regions of four sides of the touch display panel.

Fig. 15B is an enlarged view of an area surrounding the second blocking dam in the display panel according to some embodiments of the present disclosure.

Fig. 15C is an enlarged view of the first enlarged region in fig. 15B.

Fig. 15D is an enlarged view of a second enlarged region in fig. 15B.

Fig. 15E is a sectional view taken along line EE' in fig. 15A.

FIG. 15F is a cross-sectional view taken along line GG' in FIG. 15A.

Fig. 16 is a cross-sectional view of the touch display panel according to some exemplary embodiments of the present disclosure, taken along a line FF' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel extending from the display area to the first sub-bezel area, the bending area, and the second sub-bezel area.

Fig. 17 is a schematic view of a display device according to some exemplary embodiments of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described below clearly and completely with reference to the accompanying drawings. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of the disclosure.

It should be noted that in the drawings, the size and relative sizes of elements may be exaggerated for clarity and/or descriptive purposes. As such, the sizes and relative sizes of the respective elements are not necessarily limited to those shown in the drawings. In the description and drawings, the same or similar reference numerals denote the same or similar parts.

When an element is referred to as being "on," "connected to" or "coupled to" another element, it can be directly on, connected or coupled to the other element or intervening elements may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. Other terms and/or expressions used to describe the relationship between elements should be interpreted in a similar manner, e.g., "between … …" versus "directly between … …", "adjacent" versus "directly adjacent", or "on … … versus" directly on … … ", etc. Further, the term "connected" may refer to physical, electrical, communication, and/or fluid connections. Further, the X-axis, Y-axis, and Z-axis are not limited to the three axes of the rectangular coordinate system, and may be interpreted in a broader sense. For example, the X, Y, and Z axes may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For purposes of this disclosure, "at least one of X, Y and Z" and "at least one selected from the group consisting of X, Y and Z" can be interpreted as X only, Y only, Z only, or any combination of two or more of X, Y and Z such as XYZ, XY, YZ and XZ. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that, although the terms "first", "second", etc. may be used herein to describe various elements, components, elements, regions, layers and/or sections, these elements, components, elements, regions, layers and/or sections should not be limited by these terms. Rather, these terms are used to distinguish one element, component, element, region, layer or section from another. Thus, for example, a first component, a first member, a first element, a first region, a first layer, and/or a first portion discussed below could be termed a second component, a second member, a second element, a second region, a second layer, and/or a second portion without departing from the teachings of the present disclosure.

For purposes of description, spatial relational terms, such as "upper," "lower," "left," "right," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features.

It should be understood by those skilled in the art that, unless otherwise stated, the expression "height" or "thickness" refers to a dimension along a surface of each film layer disposed perpendicular to the touch display panel, that is, a dimension along a light emitting direction of the touch display panel, or a dimension along a normal direction of the display device.

Herein, unless otherwise specified, the expression "patterning process" generally includes the steps of coating of photoresist, exposure, development, etching, stripping of photoresist, and the like. The expression "one-time patterning process" means a process of forming a patterned layer, member, or the like using one mask plate.

The expression "the same layer", "the same layer arrangement", or the like refers to a layer structure formed by forming a film layer for forming a specific pattern by the same film formation process and then patterning the film layer by a single patterning process using the same mask plate. Depending on the specific pattern, one patterning process may include multiple exposure, development or etching processes, and the specific pattern in the formed layer structure may be continuous or discontinuous. These specific patterns may also be at different heights or have different thicknesses.

Herein, unless otherwise specified, the expression "electrically connected" may mean that two parts or elements are directly electrically connected, for example, part or element a is in direct contact with part or element B, and an electrical signal may be transmitted therebetween; it may also mean that two components or elements are electrically connected through a conductive medium such as a conductive wire, for example, component or element a is electrically connected with component or element B through a conductive wire to transmit an electrical signal between the two components or elements; it may also mean that two components or elements are electrically connected through at least one electronic component, for example, component or element a is electrically connected through at least one thin film transistor with component or element B to transmit an electrical signal between the two components or elements.

The embodiment of the disclosure at least provides a touch display panel and a display device. The touch display panel includes: the display device comprises a substrate base plate, a display panel and a display panel, wherein the substrate base plate comprises a display area and a peripheral area at least positioned on at least one side of the display area; a plurality of pixel units disposed in the display region, the pixel units including a pixel driving circuit and a light emitting element electrically connected to the pixel driving circuit, the light emitting element including a first electrode; a plurality of touch electrodes disposed in the display area; the touch wire is electrically connected with at least one touch electrode, and at least one part of the touch wire extends to the peripheral area; the touch lead is arranged in the peripheral area, and the touch lead are positioned in different conducting layers; the contact groove is located in the peripheral area, and the touch trace and the touch lead are in contact in the contact groove, wherein the touch trace has a first touch trace portion located in the contact groove, the substrate base plate has an upper surface close to the pixel unit, and the first touch trace portion extends obliquely relative to the upper surface of the substrate base plate. In the embodiment of the disclosure, the touch traces are obliquely arranged, so that the width of the occupied area of the touch display panel in the peripheral area is reduced, and the display device with a narrow frame is realized.

Fig. 1 is a schematic plan view of a touch display panel according to an embodiment of the present disclosure. Fig. 2 is a schematic plan view of a touch display panel according to some exemplary embodiments of the present disclosure, in which touch electrodes and touch traces are schematically shown. Fig. 3 is a cross-sectional view of the touch display panel taken along line AA' in fig. 1, schematically illustrating a bent state of the touch display panel, according to an embodiment of the present disclosure. Fig. 4 is a cross-sectional view of the touch display panel according to an embodiment of the present disclosure, taken along a line BB' in fig. 1, schematically illustrating an unfolded state of the touch display panel. Fig. 5 is a partially enlarged view of a portion I in fig. 2. Fig. 6 is a cross-sectional view of the touch display panel taken along line CC' in fig. 5 according to an embodiment of the present disclosure. Fig. 7 is a cross-sectional view of the touch display panel taken along a line DD' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel in a display area, according to an embodiment of the present disclosure.

Referring to fig. 1, a touch display panel according to an embodiment of the present disclosure may include: the substrate 10, for example, the substrate 10 may be formed of glass, plastic, polyimide, or the like. The substrate 10 includes a display area AA and a peripheral area (or referred to as a non-display area) NA located on at least one side of the display area AA.

The touch display panel may include a plurality of pixel units P (schematically illustrated in fig. 1 by a dotted line frame) disposed in the display area AA, and the plurality of pixel units P may be arranged in an array along the directions X and Y on the substrate base 10. Each pixel unit P may further include a plurality of sub-pixels, such as a red sub-pixel, a green sub-pixel, and a blue sub-pixel. In fig. 1, one sub-pixel SP is schematically shown.

For example, the touch display panel includes a signal input side IN1 (lower side shown IN fig. 1). At the signal input side IN1, a data driving chip IC may be provided, which may be electrically connected to the pixel cells P located at the display area through a plurality of signal wirings, and a pixel driving circuit may be electrically connected to the data driving chip IC. IN this way, signals such as data signals, scan signals, touch signals, and the like can be transmitted from the signal input side IN1 to the plurality of pixel units P.

For example, as shown in fig. 1, the peripheral area NA may be located on four sides of the display area AA, i.e., it surrounds the display area AA.

It should be noted that, in the drawings, the pixel unit and the sub-pixel are schematically illustrated in a rectangular shape, but this does not limit the shape of the pixel unit and the sub-pixel included in the touch display panel provided by the embodiment of the present disclosure.

In an embodiment of the present disclosure, each of the pixel units P may include a pixel driving circuit and a light emitting device electrically connected to the pixel driving circuit. For example, the light emitting device may be an Organic Light Emitting Diode (OLED), a quantum dot light emitting diode (QLED), or the like. The light emitting device may include a first electrode, a second electrode, and a light emitting layer disposed between the first electrode and the second electrode.

One of the first electrode and the second electrode is an anode, and the other is a cathode. For example, the first electrode may be an anode. The second electrode may be a cathode. The light emitting layer may be a multi-layered structure, for example, it may include a multi-layered structure formed of a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, and an electron injection layer.

It is to be noted that the light emitting device such as an organic light emitting diode may be driven actively or passively. The passive driving OLED array substrate is composed of a cathode and an anode, the crossing part of the anode and the cathode can emit light, and the driving circuit can be externally installed in a connection mode of tape carrier packaging, glass chip packaging and the like. The active driving OLED array substrate may be provided with a pixel driving circuit for each pixel, and the pixel driving circuit may include a thin film transistor having a switching function (i.e., a switching transistor), a thin film transistor having a driving function (i.e., a driving transistor), and a charge storage capacitor, and in addition, the pixel driving circuit may include other types of thin film transistors having a compensation function. It should be understood that, in the embodiments of the present disclosure, the touch display panel may be provided with various known pixel driving circuits, which are not described herein again. For example, each pixel unit P may include a pixel driving circuit having a circuit structure of 7T1C, 7T2C, 8T2C, or 4T1C, etc., in the art, and the pixel driving circuit operates under the control of a data signal transmitted through a data line and a gate scanning signal and a light emission control signal transmitted through a signal line to drive the light emitting device to emit light, thereby realizing operations such as display.

For example, the touch display panel may include a driving circuit layer, and the pixel driving circuit may be disposed in the driving circuit layer. Between the driving circuit layer and the light emitting device, an insulating layer may be provided, which may be a single insulating film layer or a stack of a plurality of insulating film layers.

For example, the touch display panel may further include various signal lines disposed on the substrate 10, including data lines, gate scan signal lines, light emission control signal lines, first power supply lines, second power supply lines, and the like, so as to provide various signals such as data signals, gate scan signals, light emission control signals, first power supply voltages, second power supply voltages, and the like to the pixel driving circuit in each sub-pixel. In the embodiment shown in fig. 1, the scanning lines GL and the data lines DL are schematically shown. The scan line GL and the data line DL may be electrically connected to each pixel unit P.

With reference to fig. 1 to fig. 3, the touch display panel according to the embodiment of the disclosure has a display area AA and a peripheral area NA surrounding the display area AA. The peripheral area NA includes a first frame area NA1, a second frame area NA2, a third frame area NA3 and a fourth frame area NA4, for example, the first frame area NA1, the second frame area NA2, the third frame area NA3 and the fourth frame area NA4 may be regarded as a lower frame, an upper frame, a left frame and a right frame of the touch display panel, respectively.

The touch display panel according to the embodiment of the present disclosure has a display area and a peripheral area, as viewed from the front of the touch display panel. The display area of the touch display panel is arranged with light emitting pixels and can display an image. A peripheral area is surrounded around the display area. Typically, the display area has a border area around it when viewed from the front. However, some touch display panels are desirable from the viewpoint of aesthetics to have a narrower frame area. Therefore, in applications such as full-screen mobile phones, the display area may not be provided with a frame area on the left, right, and upper sides. However, the touch display panel still needs to have at least one frame area for intensively accommodating the difficult-to-bend but necessary circuits, and the frame area is usually located below the display area. For example, even in current full-screen cell phone applications, there is still a lower bezel area under the cell phone where no image is displayed. It should be understood that the terms "upper", "lower", "left", "right", "front" and "rear" are used herein only to describe relative positions between components and not absolute positions. In the present disclosure, the lower frame is only for convenience of describing the relative position, but does not mean that it is necessarily located below the display screen. In addition, although the conventional touch display panel is rectangular and the lower bezel region is a rectangular area on one of its four sides, touch display panels of other outer contour shapes may have any shape of bezel region in which circuits are collectively accommodated. Any bezel in the touch display panel with concentrated circuit routing can be considered a lower bezel and is specified to be below when it is described in this disclosure, with the display area correspondingly above.

In the embodiment of the disclosure, at least a portion of the first bezel area NA1 may be bent to the non-display side of the touch display panel, so that the area of the non-display area in the display side of the touch display panel may be reduced, thereby implementing a large screen and a narrow bezel design of the touch display panel. For example, the first bezel area NA1 may include a first sub-bezel area NA11, a second sub-bezel area NA12, and a bending area B, where the first sub-bezel area NA11 is located on a side of the second sub-bezel area NA12 close to the display area AA, and the bending area B is disposed between the first sub-bezel area NA11 and the second sub-bezel area NA 12. The bending region B may be bent along the bending axis BX, so that the second sub-frame region NA12 may be bent to the non-display side of the touch display panel. For example, the second sub-frame area NA12 may be provided with a driving chip (IC) and a Flexible Printed Circuit (FPC) for controlling display and touch of the display area AA.

Referring to fig. 2 and 4 in combination, the touch display panel may include a substrate 10, a driving circuit layer 40, an encapsulation layer 20, and a touch layer 30. The driving circuit layer 40, the encapsulation layer 20 and the touch layer 30 are disposed in a direction sequentially away from the substrate base 10.

For example, the touch layer 30 may include an FMLOC film layer. With the development of technology, the market has made higher and higher demands for the thinning of display devices (e.g. mobile phones), and Flexible Multi-Layer On Cell (FMLOC) technology has come to work. In the FMLOC process, a metal grid electrode layer is manufactured on a packaging layer of the display module to achieve a touch function, and a plug-in touch structure is not needed, so that the overall thickness of the display screen can be reduced.

With combined reference to fig. 2, 5 and 6, in an embodiment of the present disclosure, the touch layer 30 may include a first touch layer 31, a second touch layer 32 and a touch insulating layer 33 disposed between the first touch layer 31 and the second touch layer 32. For example, in the display area AA, the touch display panel may include a first touch electrode TX and a second touch electrode RX, for example, the first touch electrode TX may be a touch driving electrode TX, and the second touch electrode RX may be a touch sensing electrode RX. The plurality of first touch electrodes TX may be arranged in a first direction X, and the plurality of second touch electrodes RX may be arranged in a second direction crossing the first direction. In some embodiments, the first direction is perpendicular to the second direction. For example, as illustrated in fig. 2, the first direction may be a width direction of the touch display panel, and the second direction may be a length direction of the touch display panel.

The plurality of first touch electrodes TX located in the same row may be electrically connected through the second connection portion 52, and the plurality of second touch electrodes RX located in the same column may be electrically connected through the first connection portion 51.

As an example, in the examples of fig. 2 and 5, the first touch electrode TX and the second touch electrode RX are diamond-shaped, and the first connection portion 51 and the second connection portion 52 are rectangular. However, embodiments of the present disclosure are not limited thereto, and those skilled in the art should understand that in other embodiments, the shapes of the first and second touch electrodes TX and RX and the shapes of the first and second connection parts 51 and 52 may be other shapes.

The orthographic projections of the first connection portion 51 for connecting the first touch electrode TX and the second connection portion 52 for connecting the second touch electrode RX on the substrate at least partially overlap, that is, the first connection portion 51 and the second connection portion 52 have an overlapping area.

In an embodiment of the present disclosure, the first touch electrode TX and the second touch electrode RX may be located in the same layer, for example, they may be located in the first touch layer 31. The first connection portion 51 may also be located in the first touch layer 31. The second connection portion 52 may be located in the second touch layer 32, i.e., the second connection portion 52 forms a conductive bridge portion.

The touch insulating layer 33 is located between the first touch layer 31 and the second touch layer 32, and covers the first touch electrode TX and the second touch electrode RX. At least one pair of first via holes 331 is disposed in the touch insulating layer 33, and the first via holes 331 penetrate through the touch insulating layer 33, so that a partial area of the first touch electrodes TX can be exposed, which may be referred to as a bridge area. One via hole of each pair of first via holes 331 is located on one of two adjacent first touch electrodes TX, and the other via hole is located on the other of the two adjacent first touch electrodes TX.

In some embodiments, a part of the second connection portion 52 is disposed on a side of the touch insulating layer 33 away from the substrate base plate, and the rest is located in the first via hole 331. An orthogonal projection of the second connection portion 52 on the substrate base at least partially overlaps an orthogonal projection of at least one pair of first vias 331 in the touch insulating layer 33 on the substrate base, so that the second connection portion 52 can be electrically connected with the first touch electrodes TX through the first vias 331 overlapping therewith, thereby achieving electrical connection between the adjacent first touch electrodes TX.

With combined reference to fig. 2 and 7, in the display area AA, the touch display panel may include a substrate base 10, a buffer layer 11 disposed on the substrate base 10, a semiconductor layer ACT disposed on a side of the buffer layer 11 away from the substrate base 10, a first conductive layer 41 disposed on a side of the semiconductor layer ACT away from the substrate base 10, a second conductive layer 42 disposed on a side of the first conductive layer 41 away from the substrate base 10, a third conductive layer 43 disposed on a side of the second conductive layer 42 away from the substrate base 10, and a fourth conductive layer 44 disposed on a side of the third conductive layer 43 away from the substrate base 10. The touch display panel may further include a first insulating layer GI1 disposed between the semiconductor layer ACT and the first conductive layer 41, a second insulating layer GI2 disposed between the first conductive layer 41 and the second conductive layer 42, a third insulating layer ILD1 disposed between the second conductive layer 42 and the third conductive layer 43, and a fourth insulating layer disposed between the third conductive layer 43 and the fourth conductive layer 44, for example, the fourth insulating layer may include a passivation layer PVX and a first planarization layer PLN1, the passivation layer PVX may be disposed on a side of the third conductive layer 42 away from the substrate base plate 10, and the first planarization layer PLN1 may be disposed on a side of the passivation layer PVX away from the substrate base plate 10.

For example, the touch display panel may include a plurality of pixel units and a pixel driving circuit for driving the plurality of pixel units, and the pixel driving circuit may include a plurality of thin film transistors and a storage capacitor. The thin film transistor may include an active layer, a gate electrode, a source electrode, and a drain electrode, and the storage capacitor may include a first plate and a second plate. In fig. 7, 1 thin film transistor and 1 storage capacitor are schematically shown. For example, the active layer of the thin film transistor may be located in the semiconductor layer ACT, the gate electrode G1 of the thin film transistor and the first plate C1 of the storage capacitor may be located in the first conductive layer 41, the second plate C2 of the storage capacitor may be located in the second conductive layer 42, and the source electrode S1 and the drain electrode D1 of the thin film transistor may be located in the third conductive layer 43.

In the display area AA, the touch display panel may further include a fifth conductive layer 45 disposed on a side of the fourth conductive layer 44 away from the base substrate 10, a light emitting material layer EL disposed on a side of the fifth conductive layer 45 away from the base substrate 10, and a sixth conductive layer 46 disposed on a side of the light emitting material layer EL away from the base substrate 10. The touch display panel may further include a second planarization layer PLN2 disposed between the fourth conductive layer 44 and the fifth conductive layer 45.

For example, the pixel unit may include a light emitting element, such as an organic light emitting diode. The light emitting element includes an anode, a light emitting layer, and a cathode. An anode of the light emitting element may be located in the fifth conductive layer 45, a light emitting layer of the light emitting element may be located in the light emitting material layer EL, and a cathode of the light emitting element may be located in the sixth conductive layer 46. A conductive connection portion 47 for electrically connecting the thin film transistor and the light emitting element may be located in the fourth conductive layer 44.

For example, the touch display panel may further include a pixel defining layer PDL located on a side of the fifth conductive layer 45 away from the substrate base plate 10, for defining an opening of each pixel unit.

For example, the semiconductor layer ACT may be formed of a semiconductor material such as low temperature polysilicon, and the film thickness thereof may be in a range of 400 to 800 angstroms, for example, 500 angstroms. The first conductive layer 41 and the second conductive layer 42 may be formed of a conductive material forming a gate electrode of a thin film transistor, for example, the conductive material may be Mo, and a film thickness thereof may be in a range of 2000 to 4000 angstroms, for example, 3000 angstroms. The third conductive layer 43 and the fourth conductive layer 44 may be formed of a conductive material forming a source electrode and a drain electrode of the thin film transistor, for example, the conductive material may include Ti, Al, or the like, and the third conductive layer 43 may have a stacked-layer structure formed of Ti/Al/Ti, and a film thickness thereof may be in a range of 6000 to 9000 angstroms. For example, in the case where the third conductive layer 43 or the fourth conductive layer 44 has a stacked-layer structure formed of Ti/Al/Ti, the thickness of each layer of Ti/Al/Ti may be about 500 angstroms, 6000 angstroms, and 500 angstroms, respectively. For example, the first insulation layer GI1 and the second insulation layer GI2 may be formed of silicon oxide, silicon nitride, or silicon oxynitride, each of which may have a thickness of about 1000 to 2000 angstroms. For example, the third insulating layer IDL1 and the passivation layer PVX may be formed of silicon oxide, silicon nitride, or silicon oxynitride having a thickness of about 3000 to 6000 angstroms.

The touch display panel may further include an encapsulation layer 20 covering the light emitting elements. The encapsulation layer 20 may include a film layer formed by alternating inorganic and organic layers, and for example, may include a first encapsulation sublayer 201, a second encapsulation sublayer 202, and a third encapsulation sublayer 203, which are sequentially disposed. For example, the first encapsulation sub-layer 201 and the third encapsulation sub-layer 203 may be composed of an inorganic material, and the second encapsulation sub-layer 202 may be composed of an organic material. For example, the first and third encapsulation sub-layers 201 and 203 may be formed by a chemical vapor deposition (i.e., CVD) or the like process, and the second encapsulation sub-layer 202 may be formed by an inkjet printing (IJP) or the like process.

In the embodiment of the present disclosure, the touch layer 30 is formed on the side of the second encapsulation sub-layer 202 away from the substrate base plate 10.

Fig. 14A is a schematic plan view of a touch display panel according to an embodiment of the present disclosure, schematically showing a planar arrangement of blocking dams located in a peripheral region of four sides of the touch display panel. Fig. 14B schematically shows a planar arrangement of the blocking dam in the peripheral region on the lower side of the touch display panel.

Referring to fig. 14A and 14B, in an embodiment of the disclosure, the second encapsulant sub-layer 202 has a certain fluidity during a manufacturing process, and in order to limit the fluidity, the touch display panel may further include a blocking dam disposed between the display area AA and at least one peripheral area. In the disclosed embodiment, the contact groove 80 is disposed between the blocking dam and the bending region B.

In some embodiments, the blocking dam includes a structure having at least one turn and at least partially surrounding the display area AA, and the blocking dam includes at least one organic layer. For example, referring to fig. 14A, the dam may include two turns, i.e., a first dam BAL1 and a second dam BAL2, the first dam BAL1 and the second dam BAL2 at least partially surround (e.g., completely surround) the display area AA, respectively. Referring to fig. 14B, in the lower side region of the display panel, the barrier dam BAL1 may be bifurcated into two sub-barrier dams, i.e., a first sub-barrier dam BAL11 and a second sub-barrier dam BAL 12. For example, in the embodiment shown in fig. 14B, the blocking dam still has the structure shown in fig. 14A as two circles around the display area AA at the upper side, the left side, and the right side of the display panel. That is, the barrier dam BAL1 may be bifurcated into two sub-barrier dams only at the lower side area of the display panel.

Fig. 15A is a schematic plan view of a touch display panel according to other embodiments of the present disclosure, schematically illustrating a planar arrangement of blocking dams located in a peripheral region of four sides of the touch display panel.

Referring to fig. 15A, the first barrier dam BAL1 forms a first enclosure surrounding the first area. The first area surrounds the display area AA, and for example, the first area may include a portion of the display area and the peripheral area NA.

In some embodiments, the touch display panel further includes a second blocking dam BAL2 in the peripheral area NA. The second barrier bank 2 is connected to the first barrier bank 1, dividing the first area into a first sub area entirely in the peripheral area NA and a second sub area partially in the peripheral area NA and partially in the display area AA. The second barrier dam BAL2 and a portion of the first barrier dam BAL1 surround the first sub-region. Alternatively, as shown in fig. 15A, the second sub-area surrounds the whole display area AA, and the first sub-area is completely outside the display area AA.

In some embodiments, the display panel further includes a third barrier bank 3 in the peripheral area NA. In some embodiments, the third barrier dam BAL3 includes at least a first portion P1. As shown in fig. 15A, the first part P1 is completely enclosed in the first sub-area. The first portion P1 is spaced apart from the second barrier dam BAL2 and from the first barrier dam BAL 1. Optionally, the body portion of the first portion P1 extends in a direction substantially parallel to the direction of extension of the body portion of the second barrier dam BAL2 and substantially parallel to the direction of extension of the portion of the first barrier dam BAL1 that partially surrounds the first sub-region. The first barrier bank 1, the first portion P1 of the third barrier bank, and the second barrier bank 2 form a triple barrier structure in the first sub-region. The triple barrier structure effectively prevents ink (e.g., ink for an organic encapsulation sub-layer forming an encapsulation layer) printed on the display panel during the manufacturing process of the display panel.

Fig. 15B is an enlarged view of an area surrounding the second blocking dam in the display panel according to some embodiments of the present disclosure. Fig. 15C is an enlarged view of the first enlarged region in fig. 15B. Referring to fig. 15B and 15C, in some embodiments, the display panel further includes a first branching barrier BB1 in the first sub-area, the first branching barrier BB1 being connected to the second barrier dam BAL 2. The first branch barrier BB1 branches from the second barrier dam BAL 2. The first branch barrier BB1 branches from the second barrier dam BAL2 at least initially in a direction substantially parallel to the extending direction of the envelope portion EP of the first barrier dam.

In some embodiments, the first portion P1 includes a first end fragment ESG 1. The first end fragment ESG1 extends at least partially into a first corner region CR1 between a portion of the first branch barrier BB1 and the second barrier dam BAL 2. The portion of the second barrier dam BAL2 has an inclination angle with respect to the envelope portion EP of the first barrier dam.

In some embodiments, the first branch barrier BB1 comprises at least a first segment SG1 and a second segment SG 2. Alternatively, second segment SG2 is indirectly connected to second barrier dam BAL 2. In one example, the second segment SG2 is connected to the second barrier dam BAL2 by at least the first segment SG 1. The first section SG1 connects the second section SG2 to the second barrier dam BAL 2.

In some embodiments, in a plan view of the display panel, the extending direction of the second segment SG2 is more toward the display area AA than the extending direction of the first segment SG 1. In one example, the first SG1 and the second SG2 are line segments, and the first SG1 and the second SG2 have an angle with respect to each other in a range of 95 to 175 degrees, such as 95 to 105 degrees, 105 to 115 degrees, 115 to 125 degrees, 125 to 135 degrees, 135 to 145 degrees, 145 to 155 degrees, 155 to 165 degrees, or 165 to 175 degrees. Optionally, the included angle of the first section SG1 and the second section SG2 is in the range of 130 degrees to 140 degrees (e.g., 135 degrees).

In some embodiments, first portion P1 further includes a first body fragment MSG1 connected to a first end fragment ESG 1. First body segment MSG1 is at least partially outside first corner region CR 1.

In some embodiments, the first end segment ESG1 extends farther from the display area AA in a plan view of the display panel relative to the direction of extension of the first body segment MSG 1. In one example, the first end fragment ESG1 and the first body fragment MSG1 are line segments and the first end fragment ESG1 and the first body fragment MSG1 are at an angle in the range of 95 degrees to 175 degrees with respect to each other, such as 95 degrees to 105 degrees, 105 degrees to 115 degrees, 115 degrees to 125 degrees, 125 degrees to 135 degrees, 135 degrees to 145 degrees, 145 degrees to 155 degrees, 155 degrees to 165 degrees, or 165 degrees to 175 degrees. Optionally, the angle between the first end fragment ESG1 and the first body fragment MSG1 is in the range of 130 degrees to 140 degrees, for example 135 degrees.

In some embodiments, in a plan view of the display panel, the extending direction of the second segment SG2 is more toward the first body segment MSG1 than the extending direction of the first segment SG 1; in a plan view of the display panel, the extending direction of the first end fragment ESG1 is more toward the first fragment SG1 than the extending direction of the first body fragment MSG 1. Alternatively, the extending direction of the first segment SG1 and the extending direction of the first body segment MSG1 are substantially parallel to each other. Optionally, the direction of extension of the second fragment SG2 and the direction of extension of the first end fragment ESG1 are substantially parallel to each other.

In some embodiments, the third barrier dam BAL3 further includes a second portion P2 partially surrounding the display area AA. First portion P1 and second portion P2 are separated by a second barrier dam BAL 2. The second portion P2 is spaced apart from the second barrier dam BAL 2.

In some embodiments, the display panel further includes a second branch blocking part BB2 in the first sub-area. The second branch barrier BB2 is connected to the second barrier dam BAL 2. The second branch barrier BB2 branches from the second barrier dam BAL 2. The second branch barrier BB2 branches from the second barrier dam BAL2 at least initially in a direction substantially parallel to the extending direction of the envelope portion EP of the first barrier dam.

In some embodiments, the second portion P2 includes a second end fragment ESG 2. The second end fragment ESG2 extends at least partially into a second corner region CR2 between the second branch barrier BB2 and a portion of the second barrier dam BAL 2. The portion of the second barrier dam BAL2 has an inclination angle with respect to the envelope portion EP of the first barrier dam.

In some embodiments, the second branch barrier BB2 comprises at least a third segment SG3 and a fourth segment SG 4. Alternatively, the fourth segment SG4 is indirectly connected to the second barrier dam BAL 2. In one example, the fourth segment SG4 is connected to the second barrier dam BAL2 at least through the third segment SG 3. The third segment SG3 connects the fourth segment SG4 to the second barrier dam BAL 2.

In some embodiments, an extending direction of the fourth segment SG4 is more toward the display area AA relative to an extending direction of the third segment SG3 in a plan view of the display panel. In one example, the third segment SG3 and the fourth segment SG4 are line segments, and the third segment SG3 and the fourth segment SG4 are at an angle in a range of 95 to 175 degrees, such as 95 to 105 degrees, 105 to 115 degrees, 115 to 125 degrees, 125 to 135 degrees, 135 to 145 degrees, 145 to 155 degrees, 155 to 165 degrees, or 165 to 175 degrees, with respect to each other. Optionally, the included angle between the third section SG3 and the fourth section SG4 is in the range of 130 degrees to 140 degrees, for example 135 degrees. 3

In some embodiments, the second portion P2 further includes a second body fragment MSG2 connected to a second end fragment ESG 2. Second body segment MSG2 is located at least partially outside second corner region CR 2.

In some embodiments, the extending direction of the second end fragment ESG2 is farther away from the display area AA in a plan view of the display panel relative to the extending direction of the second body fragment MSG 2. In one example, the second end fragment ESG2 and the second body fragment MSG2 are line segments, and the second end fragment ESG2 and the second body fragment MSG2 are at an angle in the range of 95 degrees to 175 degrees with respect to each other, such as 95 degrees to 105 degrees, 105 degrees to 115 degrees, 115 degrees to 125 degrees, 125 degrees to 135 degrees, 135 degrees to 145 degrees, 145 degrees to 155 degrees, 155 degrees to 165 degrees, or 165 degrees to 175 degrees. Optionally, the angle between the second end segment ESG2 and the second body segment MSG2 is in the range of 130 degrees to 140 degrees, for example 135 degrees.

In some embodiments, in a plan view of the display panel, the extending direction of the fourth segment SG4 is more toward the second body segment MSG2 than the extending direction of the third segment SG 3; in a plan view of the display panel, the extending direction of the second end fragment ESG2 is more toward the third fragment SG3 than the extending direction of the second body fragment MSG 2. Alternatively, the extending direction of the third segment SG3 and the extending direction of the second body segment MSG2 are substantially parallel to each other. Optionally, the extending direction of the fourth fragment SG4 and the extending direction of the second end fragment ESG2 are substantially parallel to each other.

In some embodiments, the third barrier dam BAL3 further includes a third portion P3 that partially surrounds the display area AA. The first portion P1 and the third portion P3 are separated by a second barrier dam BAL 2. The third portion P3 is in the second sub-region and outside the first sub-region. The third portion P3 is spaced apart from the second dam BAL 2.

Fig. 15D is an enlarged view of a second enlarged region in fig. 15B. Referring to fig. 15B and 15D, in some embodiments, the display panel further includes a third spur barrier BB3 in the first sub-area, the third spur barrier BB3 being connected to the second barrier dam BAL 2. The third branch barrier BB3 branches from the second barrier dam BAL 2. The third branch barrier BB3 branches off from the second barrier dam BAL2 at least initially in a direction substantially parallel to the extending direction of the envelope portion EP of the first barrier dam.

In some embodiments, the first portion P1 further includes a third end fragment ESG 3. The third end fragment ESG3 extends at least partially into a third corner region CR3 between the third tributary barrier BB3 and a portion of the second barrier dam BAL 2. The portion of the second barrier dam BAL2 has an inclination angle with respect to the envelope portion EP of the first barrier dam.

In some embodiments, the third branch barrier BB3 includes at least a fifth segment SG5 and a sixth segment SG 6. Alternatively, the sixth segment SG6 is indirectly connected to the second barrier dam BAL 2. In one example, the sixth segment SG6 is connected to the second barrier dam BAL2 at least through the fifth segment SG 5. The fifth segment SG5 connects the sixth segment SG6 to the second dam BAL 2.

In some embodiments, in a plan view of the display panel, the extending direction of the sixth segment SG6 is more toward the display area AA than the extending direction of the fifth segment SG 5. In one example, the fifth segment SG5 and the sixth segment SG6 are line segments, and the fifth segment SG5 and the sixth segment SG6 are at an angle in a range of 95 to 175 degrees, such as 95 to 105 degrees, 105 to 115 degrees, 115 to 125 degrees, 125 to 135 degrees, 135 to 145 degrees, 145 to 155 degrees, 155 to 165 degrees, or 165 to 175 degrees, with respect to each other. Optionally, the included angle between the fifth segment SG5 and the sixth segment SG6 is in the range of 130 degrees to 140 degrees, for example 135 degrees.

In some embodiments, the first portion P1 further includes a third body fragment MSG3 connected to a third end fragment ESG 3. The third body segment MSG3 is located at least partially outside of the third angular region CR 3. Optionally, the first body segment MSG1 and the third body segment MSG3 are part of the overall structure of the first portion P1. Optionally, the first body segment MSG1 and the third body segment MSG3 are co-linear segments of the first portion P1. Optionally, the first body segment MSG1 and the third body segment MSG3 form a linear portion of the first portion P1, to which the first end segment ESG1 and the third end segment ESG3 are connected at opposite ends of the linear portion, respectively.

In some embodiments, the extending direction of the third end fragment ESG3 is farther from the display area AA relative to the extending direction of the third body fragment MSG3 in a plan view of the display panel. In one example, the third end segment ESG3 and the third body segment MSG3 are line segments, respectively, and the third end segment ESG3 and the third body segment MSG3 are at an angle in the range of 95 degrees to 175 degrees with respect to each other, such as 95 degrees to 105 degrees, 105 degrees to 115 degrees, 115 degrees to 125 degrees, 125 degrees to 135 degrees, 135 degrees to 145 degrees, 145 degrees to 155 degrees, 155 degrees to 165 degrees, or 165 degrees to 175 degrees. Optionally, the angle between the third end segment ESG3 and the third body segment MSG3 is in the range of 130 degrees to 140 degrees, for example 135 degrees.

In some embodiments, in a plan view of the display panel, the extending direction of the sixth segment SG6 is more toward the third body segment MSG3 than the extending direction of the fifth segment SG 5; in a plan view of the display panel, the extending direction of the third end fragment ESG3 is more toward the fifth fragment SG5 than the extending direction of the third body fragment MSG 3. Alternatively, the extending direction of the fifth segment SG5 and the extending direction of the third body segment MSG3 are substantially parallel to each other. Optionally, the extending direction of the sixth fragment SG6 and the extending direction of the third end fragment ESG3 are substantially parallel to each other.

In some embodiments, the display panel further includes a fourth branch barrier BB4 in the first sub region SA 1. The fourth branch barrier BB4 is connected to the second barrier dam BAL 2. The fourth branch barrier BB4 branches from the second barrier dam BAL 2. The fourth branch barrier BB4 branches from the second barrier dam BAL2 at least initially in a direction substantially parallel to the extending direction of the envelope portion EP of the first barrier dam.

In some embodiments, third portion P3 includes a fourth end fragment ESG 4. The fourth end fragment ESG4 extends at least partially into the fourth corner region CR4 between the fourth tributary barrier BB4 and a portion of the second barrier dam BAL 2. The portion of the second barrier dam BAL2 has an inclination angle with respect to the envelope portion EP of the first barrier dam.

In some embodiments, the fourth tributary barrier BB4 includes at least a seventh segment SG7 and an eighth segment SG 8. Alternatively, the eighth segment SG8 is indirectly connected to the second barrier dam BAL 2. In one example, the eighth segment SG8 is connected to the second barrier dam BAL2 through at least the seventh segment SG 7. The seventh segment SG7 connects the eighth segment SG8 to the second dam BAL 2.

In some embodiments, in a plan view of the display panel, an extending direction of the eighth segment SG8 is more toward the display area AA than an extending direction of the seventh segment SG 7. In one example, the seventh segment SG7 and the eighth segment SG8 are line segments, and the seventh segment SG7 and the eighth segment SG8 are at an angle in a range of 95 to 175 degrees, such as 95 to 105 degrees, 105 to 115 degrees, 115 to 125 degrees, 125 to 135 degrees, 135 to 145 degrees, 145 to 155 degrees, 155 to 165 degrees, or 165 to 175 degrees, with respect to each other. Optionally, the included angle between the seventh segment SG7 and the eighth segment SG8 is in the range of 130 degrees to 140 degrees, for example 135 degrees.

In some embodiments, the third portion P3 further includes a fourth body segment MSG4 connected to a fourth end segment ESG 4. The fourth body segment MSG4 is located at least partially outside of the fourth corner region CR 4.

In some embodiments, the extending direction of the fourth end segment ESG4 is farther from the display area AA relative to the extending direction of the fourth body segment MSG4 in a plan view of the display panel. In one example, the fourth end segment ESG4 and the fourth body segment MSG4 are line segments and the fourth end segment ESG4 and the fourth body segment MSG4 are angled with respect to each other in the range of 95 degrees to 175 degrees, such as 95 degrees to 105 degrees, 105 degrees to 115 degrees, 115 degrees to 125 degrees, 125 degrees to 135 degrees, 135 degrees to 145 degrees, 145 degrees to 155 degrees, 155 degrees to 165 degrees, or 165 degrees to 175 degrees. Optionally, the angle between the fourth end segment ESG4 and the fourth body segment MSG4 is in the range of 130 degrees to 140 degrees, for example 135 degrees.

In some embodiments, in a plan view of the display panel, the extending direction of the eighth segment SG8 is more toward the fourth body segment MSG4 than the extending direction of the seventh segment SG 7; in a plan view of the display panel, the extending direction of the fourth end fragment ESG4 is more toward the seventh fragment SG7 than the extending direction of the fourth body fragment MSG 4. Alternatively, the extending direction of the seventh segment SG7 and the extending direction of the fourth body segment MSG4 are substantially parallel to each other. Alternatively, the extending direction of the eighth fragment SG8 and the extending direction of the fourth terminal fragment ESG4 are substantially parallel to each other.

Fig. 15E is a sectional view taken along line EE' in fig. 15A. FIG. 15F is a cross-sectional view taken along line GG' in FIG. 15A. Referring to fig. 15E and 15F, in some embodiments, the display panel includes a substrate base 10 in a display area AA; a first signal line layer SD1 on the base substrate 10; a first planarizing layer PLN1 on a side of the first signal line layer SD1 away from the base substrate 10; a second signal line layer SD2 on a side of the first planarization layer PLN1 away from the first signal line layer SD 1; a second planarizing layer PLN2 on a side of the second signal line layer SD2 away from the first planarizing layer PLN 1; an anode material layer AML on a side of the second planarizing layer PLN2 away from the second signal line layer SD 2; a pixel defining layer PDL located on a side of the anode material layer AML away from the second planarizing layer PLN2, the pixel defining layer PDL defining sub-pixel openings configured to receive the organic light emitting material; an organic light emitting material layer EL on a side of the pixel defining layer PDL away from the anode material layer AML; a cathode material layer CML on a side of the organic light emitting material layer EL away from the anode material layer AML; an encapsulation layer EN on a side of the cathode material layer CML remote from the organic light emitting material layer EL; the touch insulating layer TI is positioned on one side, away from the cathode material layer CML, of the packaging layer EN; a touch electrode layer TE located on a side of the touch insulating layer TI away from the encapsulation layer EN; and an overcoat layer TOC on a side of the touch electrode layer TE away from the touch insulating layer TI.

In the embodiment shown in fig. 15E and 15F, the first signal line layer SD1 corresponds to the third conductive layer 43, the second signal line layer SD2 corresponds to the fourth conductive layer 44, the anode material layer AML corresponds to the fifth conductive layer 45, and the cathode material layer CML corresponds to the sixth conductive layer 46.

In some embodiments, in the display area AA, the first signal line layer SD1 includes a plurality of signal lines, for example, a plurality of gate lines. In some embodiments, in the display area AA, the second signal line layer SD2 includes a plurality of signal lines, for example, a plurality of data lines. In some embodiments, in the display area AA, the anode material layer AML includes a plurality of anodes of a plurality of light emitting diodes. In some embodiments, the cathode material layer CML includes a cathode of one or more light emitting diodes in the display area AA.

In some embodiments, in at least a part of the second peripheral sub-region, the display panel includes a substrate base plate 10; a first signal line layer SD1 on the base substrate 10; a first planarizing layer PLN1 on a side of the first signal line layer SD1 away from the base substrate 10; a second signal line layer SD2 on a side of the first planarization layer PLN1 away from the first signal line layer SD 1; a second planarization layer PLN2 on a side of the second signal line layer SD2 away from the first planarization layer PLN 1; an anode material layer AML on a side of the second planarizing layer PLN2 away from the second signal line layer SD 2; a cathode material layer CML on a side of the anode material layer AML away from the second planarization layer PLN 2; the packaging layer EN is positioned on one side, away from the anode material layer AML, of the cathode material layer CML; the touch insulating layer TI is positioned on one side, away from the cathode material layer CML, of the packaging layer EN; a touch electrode layer TE located on a side of the touch insulating layer TI away from the encapsulation layer EN; and an overcoat layer TOC on a side of the touch electrode layer TE away from the touch insulating layer TI.

In some embodiments, in at least a part of the second peripheral sub-region, the third barrier dam BAL3 includes a stacked structure including a plurality of sub-layers stacked together. Referring to fig. 15E, in one example, the plurality of sub-layers of the stacked structure includes a first sub-layer SL1 in the same layer as the second planarization layer PLN 2; a second sublayer SL2 on the side of the first sublayer SL1 facing away from the substrate base plate 10, the second sublayer SL2 being in the same layer as the anode material layer AML; a third sub-layer SL3 located on the side of the second sub-layer SL2 remote from the first sub-layer SL1, the third sub-layer SL3 being in the same layer as the pixel defining layer PDL; a fourth sub-layer SL4 located on the side of the third sub-layer SL3 remote from the second sub-layer SL2, the fourth sub-layer SL4 being in the same layer as the spacer layer; and a fifth sublayer SL5, located on the side of the fourth sublayer SL4 remote from the third sublayer SL3, the fifth sublayer SL5 being in the same layer as the layer of cathode material CML. Alternatively, the display panel includes a portion of the second signal line layer SD2 on a side of the first sub-layer SL1 close to the substrate base plate 10. Optionally, the display panel further includes a portion of the first signal line layer SD1 at a side of the second signal line layer SD2 away from the first sub-layer SL1 and close to the base substrate BS. The spacer layer is made of an insulating material.

As used herein, the term "same layer" refers to a relationship between layers formed simultaneously in the same step. In one example, when first sub-layer SL1 and second planarization layer PLN2 are formed as a result of one or more steps of the same patterning process performed in a material deposited in the same deposition process, they are in the same layer. In another example, the first sub-layer SL1 in the same layer as the second planarization layer PLN2 may be formed in the same layer by simultaneously performing the step of forming the first sub-layer SL1 and the step of forming the second planarization layer PLN 2. The term "same layer" does not always mean that the thickness of a layer or the height of a layer is the same in a cross-sectional view.

In some embodiments, the first barrier dam BAL1 surrounding the first region includes a stacked structure including a plurality of sub-layers stacked together. Referring to fig. 15E, in at least a portion of the second peripheral sub-region, the plurality of sub-layers of the stacked structure includes a sixth sub-layer SL6, which is in the same layer as the second planarization layer PLN 2; a seventh sub-layer SL7 located on a side of the sixth sub-layer SL6 away from the substrate base plate 10, the seventh sub-layer SL7 being in the same layer as the anode material layer AML; an eighth sublayer SL8 located on the side of the seventh sublayer SL7 remote from the sixth sublayer SL6, the eighth sublayer SL8 being in the same layer as the pixel defining layer PDL; a ninth sublayer SL9, located on the side of the eighth sublayer SL8 remote from the seventh sublayer SL7, the ninth sublayer SL9 being in the same layer as the spacer layer.

Referring to fig. 15A and 15E, in some embodiments, the display panel further includes a fourth barrier dam BAL 4. The fourth barrier dam BAL4 is in the peripheral area NA. The fourth barrier BAL4 forms an enclosure around a second area that surrounds the first area. In some embodiments, in at least a portion of the second peripheral sub-region PSA2, the fourth barrier dam BAL4 includes a stacked structure including a plurality of sub-layers stacked together. Referring to fig. 15E, in one example, the plurality of sub-layers of the stacked structure includes a tenth sub-layer SL10 on the substrate base plate 10, the tenth sub-layer SL10 being in the same layer as the first signal line layer SD 1; an eleventh sublayer SL11 located on the side of the tenth sublayer SL10 away from the substrate base plate 10, the eleventh sublayer SL11 being in the same layer as the first planarizing layer PLN 1; a twelfth sublayer SL12 on a side of the eleventh sublayer SL11 remote from the tenth sublayer SL10, the twelfth sublayer SL12 being in the same layer as the second signal line layer SD 2; a thirteenth sublayer SL13 on the side of the twelfth sublayer SL12 remote from the eleventh sublayer SL11, the thirteenth sublayer SL13 being in the same layer as the second planarizing layer PLN 2; a fourteenth sublayer SL14 located on a side of the thirteenth sublayer SL13 remote from the twelfth sublayer SL12, the fourteenth sublayer SL14 being in the same layer as the anode material layer AML; a fifteenth sublayer SL15 located on a side of the fourteenth sublayer SL14 remote from the thirteenth sublayer SL13, the fifteenth sublayer SL15 being in the same layer as the pixel defining layer PDL; a sixteenth sublayer SL16 on the side of the fifteenth sublayer SL15 away from the fourteenth sublayer SL14, the sixteenth sublayer SL16 being in the same layer as the spacer layer.

Referring to fig. 15F, in some embodiments, in the first peripheral sub-area, the display substrate includes a substrate base plate 10; a first planarizing layer PLN1 on the base substrate 10; a second planarizing layer PLN2 on a side of the first planarizing layer PLN1 away from the base substrate 10; an encapsulation layer EN on a side of the second planarization layer PLN2 remote from the first planarization layer PLN 1; a touch insulating layer TI on a side of the encapsulation layer EN away from the second planarization layer PLN 2; a touch electrode layer TE located on a side of the touch insulating layer TI away from the encapsulation layer EN; and an overcoat layer TOC on a side of the touch electrode layer TE away from the touch insulating layer TI.

In some embodiments, in the first peripheral sub-area, the third barrier dam BAL3 includes a stacked structure including a plurality of sub-layers stacked together. Referring to fig. 15F, in the first peripheral sub-region, the plurality of sub-layers of the stack structure includes a first sub-layer SL1, which is in the same layer as the second planarization layer PLN 2; a third sublayer SL3 on a side of the first sublayer SL1 remote from the substrate base plate 10, the third sublayer SL3 being in the same layer as the pixel defining layer PDL; a fourth sub-layer SL4, which is located on the side of the third sub-layer SL3 remote from the first sub-layer SL1, the fourth sub-layer SL4 being in the same layer as the spacer layer. Comparing the third barrier dam BAL3 in the first peripheral sub-region (fig. 15F) and in the second peripheral sub-region PSA2 (fig. 15E), the second sub-layer SL2 (in the same layer as the anode material layer AML) and the fifth sub-layer SL5 (in the same layer as the cathode material layer CML) are substantially absent in the third barrier dam BAL3 in the first peripheral sub-region (e.g., at least 80% absent, at least 85% absent, at least 90% absent, at least 95% absent, at least 99% absent, or 100% absent). Further, first signal line layer SD1 and second signal line layer SD2 are substantially absent in the first peripheral sub-region (e.g., at least 80% absent, at least 85% absent, at least 90% absent, at least 95% absent, at least 99% absent, or 100% absent).

In some embodiments, the first barrier dam BAL1 surrounding the first region includes a stacked structure including a plurality of sub-layers stacked together. Referring to fig. 15F, in the first peripheral sub-region, the plurality of sub-layers of the stack structure includes a sixth sub-layer SL6, which is in the same layer as the second planarization layer PLN 2; an eighth sublayer SL8 located on the side of the sixth sublayer SL6 remote from the substrate base plate 10, the eighth sublayer SL8 being in the same layer as the pixel defining layer PDL; a ninth sublayer SL9, located on the side of the eighth sublayer SL8 remote from the sixth sublayer SL6, the ninth sublayer SL9 being in the same layer as the spacer layer. Comparing the first barrier dam BAL1 in the first peripheral sub-region (fig. 15F) and in the second peripheral sub-region PSA2 (fig. 15E), the seventh sub-layer SL7 (in the same layer as the anode material layer AML) is substantially absent in the first barrier dam BAL1 in the first peripheral sub-region (e.g., at least 80% absent, at least 85% absent, at least 90% absent, at least 95% absent, at least 99% absent, or 100% absent). Further, first signal line layer SD1 and second signal line layer SD2 are substantially absent in the first peripheral sub-region (e.g., at least 80% absent, at least 85% absent, at least 90% absent, at least 95% absent, at least 99% absent, or 100% absent).

Referring to fig. 15A and 15F, in some embodiments, the display substrate further includes a fourth barrier dam BAL 4. The fourth barrier dam BAL4 is in the peripheral area NA. The fourth barrier BAL4 forms an enclosure around a second area that surrounds the first area. In some embodiments, in the first peripheral sub-region, the fourth barrier dam BAL4 includes a stacked structure including a plurality of sub-layers stacked together. Referring to fig. 15F, in the first peripheral sub-region, the plurality of sub-layers of the stack structure includes an eleventh sub-layer SL11 in the same layer as the first planarization layer PLN 1; a thirteenth sublayer SL13 on the side of the eleventh sublayer SL11 facing away from the substrate 10, the thirteenth sublayer SL13 being in the same layer as the second planarizing layer PLN 2; a fifteenth sublayer SL15 on a side of the thirteenth sublayer SL13 remote from the eleventh sublayer SL11, the fifteenth sublayer SL15 being in the same layer as the pixel defining layer PDL; a sixteenth sublayer SL16 on the side of the fifteenth sublayer SL15 away from the thirteenth sublayer SL13, the sixteenth sublayer SL16 being in the same layer as the spacer layer. Comparing the fourth barrier dams BAL4 in the first peripheral sub-region (fig. 15F) and the second peripheral sub-region PSA2 (fig. 15E), the tenth sub-layer SL10 in the same layer as the first signal line layer SD1 is substantially absent in the fourth barrier dams BAL4 in the first peripheral sub-region; a twelfth sub-layer SL12 in the same layer as the second signal line layer SD 2; and a fourteenth sublayer SL14 in the same layer as the anode material layer AML (e.g., at least 80% absent, at least 85% absent, at least 90% absent, at least 95% absent, at least 99% absent, or 100% absent). Further, first signal line layer SD1 and second signal line layer SD2 are substantially absent in the first peripheral sub-region (e.g., at least 80% absent, at least 85% absent, at least 90% absent, at least 95% absent, at least 99% absent, or 100% absent).

In some embodiments, the organic encapsulant sub-layer is substantially (e.g., at least 80%, at least 85%, at least 90%, at least 95%, at least 99%, or 100%) contained in the second sub-region. By including the organic encapsulant sub-layer in the second sub-region, the display substrate may maintain relatively excellent water and oxygen resistance even if a small degree of cracking occurs in the second inorganic encapsulant sub-layer. This is because there is no organic encapsulating material sub-layer in the region having the crack (e.g., between the first barrier layer and the fourth barrier layer), and water/oxygen does not readily penetrate into the display substrate where there is no organic material.

By combining the third barrier layer with the second barrier layer, the flow of the organic encapsulant ink during printing can be stably controlled. In particular, a more planar sub-layer of organic encapsulation material may be formed uniformly in the peripheral region. By having a flatter organic encapsulating material sub-layer, the slope of the edges of the organic encapsulating material sub-layer in the peripheral region may be greatly reduced. The touch electrode layer formed near the edges of the organic encapsulation material sub-layer can be more reliably manufactured, thereby avoiding open-circuit or short-circuit problems in the touch electrode layer, especially when the touch electrode is made of grid lines.

In some embodiments, the organic encapsulating material sub-layer is substantially absent in the first sub-region SA1 (e.g., at least 80% absent, at least 85% absent, at least 90% absent, at least 95% absent, at least 99% absent, or 100% absent), at least partially present in the second sub-region SA2, and present throughout the display region AA.

Fig. 8 is a cross-sectional view of the touch display panel taken along a line FF' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel extending from the display area to the peripheral area, according to an embodiment of the present disclosure. With reference to fig. 2 and fig. 8, in the peripheral area (e.g., the first bezel area), the touch display panel includes a touch trace 60, and the touch trace 60 is electrically connected to the touch electrode and extends from the display area AA to the first sub-bezel area NA 11. For example, the touch trace 60 is disposed on a side of the package layer 20 away from the substrate 10. The touch trace 60 may be located in at least one of the first touch layer 31 and the second touch layer 32. For example, the touch trace 60 can be located in the second touch layer 32.

In the peripheral region (e.g., the first bezel region), the touch display panel further includes a touch lead 70, and the touch lead 70 extends from the first sub-bezel region NA11 to the second sub-bezel region NA 12. For example, the touch lead 70 may be located in the fourth conductive layer 44.

One end of the touch trace 60 is electrically connected to the touch electrode (the first touch electrode and/or the second touch electrode) located in the display area, and the other end of the touch trace 60 is electrically connected to the touch lead 70. One end of the touch lead 70 is electrically connected to the touch trace 60, and the other end of the touch lead 70 is electrically connected to a driving chip (IC) for controlling display and touch in the display area AA, a Flexible Printed Circuit (FPC), and the like. In this way, touch control signals on a driver chip (IC) and a flexible circuit board (FPC) can be transmitted to the respective touch electrodes.

As illustrated in fig. 8, the touch display panel may include a contact groove 80. The other end of the touch trace 60 is electrically connected to the touch lead 70 through the contact groove 80.

It should be noted that, in the embodiments of the present disclosure, the expression "contact groove" is not limited to the form of a groove, and the form of a contact groove may include, but is not limited to, the form of a groove, a via, and the like. The contact groove is mainly used for contacting two components positioned on different conductive layers so as to realize electric connection between the two components.

Referring to fig. 8, in the peripheral region (e.g., the first frame region), the touch display panel includes a first supporting structure 91 and a second supporting structure 92. The first support structures 91 may be located in the first planarization layer PLN1 and the second support structures 92 may be located in the second planarization layer PLN 2.

The first support structure 91 may include a first surface 911 remote from the substrate base plate 10 and a second surface 912 close to the substrate base plate 10. The second surface 912 is planar, i.e., the second surface 912 is substantially parallel to the upper surface of the substrate base plate 10.

At least a portion of the first surface 911 is beveled. Specifically, the first surface 911 includes a first portion 913 and a second portion 914, and the second portion 914 is closer to the display area AA than the first portion 913. The second portion 914 is planar, i.e., the second portion 914 is substantially parallel to the upper surface of the substrate base plate 10. The first portion 913 is a slope, that is, the first portion 913 is not parallel to the upper surface of the substrate 10 and has a certain inclination angle with respect to the upper surface of the substrate 10.

The first portion 913 of the first surface 911 has a first end 9131 proximate to the display area and a second end 9132 distal from the display area. The second end 9132 is lower in height than the first end 9131, that is, the second end 9132 is closer to the upper surface of the substrate base 10 than the first end 9131 in a direction perpendicular to the upper surface of the substrate base 10.

For example, the first planarizing layer PLN1 can have a thickness between 1-10 microns, e.g., about 1.5 microns, 2 microns, 3 microns, 5 microns, 8 microns, 10 microns. The thickness of the region where the second portion 914 of the first support structure 91 is located is substantially equal to the height of the first planarizing layer PLN1, i.e., the thickness of the region where the first portion 913 of the first support structure 91 is located may be between 1-10 microns, for example, about 1.5 microns, 2 microns, 3 microns, 5 microns, 8 microns, 10 microns. The thickness of first support structure 91 at first end 9131 is substantially equal to the thickness of the area where second portion 914 of first support structure 91 is located. The thickness of the first support structure 91 at the second end 9132 is less than the thickness of the first support structure 91 at the first end 9131. In some exemplary embodiments, the thickness of the first support structure 91 at the second end 9132 is less than 1 micron, e.g., less than 0.5 microns, or may be substantially equal to 0. That is, the height difference between the second end 9132 and the first end 9131 can be between 0.5-10 microns.

In an embodiment of the present disclosure, the slope of the first portion 913 of the first surface 911 (i.e., the angle of inclination of the first portion 913 of the first surface 911 with respect to horizontal) α is less than a prescribed slope threshold. The slope α of the first portion 913 of the first surface 911 is related to the height difference between the second end 9132 and the first end 9131 and the width of the orthographic projection of the first portion 913 on the substrate base. For example, tan α is H/L, where H is a height difference between the second end 9132 and the first end 9131, and L is a width of an orthogonal projection of the first portion 913 on the substrate base. In fig. 8, a direction pointing from the display area AA to the second sub-frame area NA12 may be defined as a first direction X, and a dimension of the orthographic projection of the first portion 913 on the substrate along the first direction X is a width thereof.

For example, in some examples, L can be between 10-50 microns, such as about 10 microns, about 20 microns, 25 microns, 30 microns, 40 microns, 50 microns. For example, L may be about 20 microns and H may be about 8 microns, in which case tan α is 0.4 and the slope α of the first portion 913 of the first surface 911 is about 21.8 °.

In the embodiment of the present disclosure, the prescribed gradient threshold value is associated with multiple factors, for example, a width of a lower frame of the display panel that needs to be reduced, a CVD forming process, and the like, and with respect to these factors, it will be described in further detail below.

The second support structure 92 is formed on a side of the first support structure 91 remote from the substrate base plate 10. The orthographic projection of the second support structure 92 on the substrate base plate 10 at least partially overlaps the orthographic projection of the first support structure 91 on the substrate base plate 10, e.g. the orthographic projection of the second support structure 92 on the substrate base plate 10 substantially falls within the orthographic projection of the first support structure 91 on the substrate base plate 10. With combined reference to fig. 8, the orthographic projection of the second support structure 92 on the substrate base plate 10 substantially falls within the orthographic projection of the second portion 914 on the substrate base plate 10. That is, the second support structure 92 is formed substantially on the plane of the first support structure 91, not on the inclined plane of the first support structure 91.

At least a portion of the touch lead 70 is located on the inclined surface of the first supporting structure 91, i.e., at least a portion of the touch lead 70 is also obliquely disposed. For example, the touch lead 70 may include a first touch lead portion 701, a second touch lead portion 702, and a third touch lead portion 703. The second touch lead portion 702 is located between the first touch lead portion 701 and the third touch lead portion 703. It should be understood that the touch lead 70 is described as being divided into 3 parts for convenience of description, but the first touch lead part 701, the second touch lead part 702, and the third touch lead part 703 may be continuously extended, i.e., the three parts are connected as a whole. The first touch lead part 701 is closer to the display area AA than the third touch lead part 703.

An orthographic projection of the first touch lead portion 701 on the substrate base 10 at least partially overlaps with an orthographic projection of the first support structure 91 on the substrate base 10, for example, the orthographic projection of the first touch lead portion 701 on the substrate base 10 substantially falls within the orthographic projection of the first support structure 91 on the substrate base 10. With combined reference to fig. 8, an orthographic projection of the first touch lead portion 701 on the substrate base 10 substantially falls within an orthographic projection of the second portion 914 on the substrate base 10. That is, the first touch lead portion 701 is formed substantially on the plane of the first support structure 91, not on the inclined plane of the first support structure 91. The first touch lead portion 701 is sandwiched between the first portion 913 of the first support structure 91 and the second support structure 92. The first touch lead portion 701 is located on the planar portion of the first support structure 91, so that the first touch lead portion 701 extends substantially parallel with respect to the upper surface of the substrate base 10.

An orthographic projection of the second touch lead portion 702 on the substrate base 10 at least partially overlaps with an orthographic projection of the first support structure 91 on the substrate base 10, for example, the orthographic projection of the second touch lead portion 702 on the substrate base 10 substantially falls within the orthographic projection of the first support structure 91 on the substrate base 10. With combined reference to fig. 8, the orthographic projection of the second touch lead portion 702 on the substrate base 10 substantially falls within the orthographic projection of the first portion 913 on the substrate base 10. That is, the second touch lead portion 702 is substantially formed on the inclined surface of the first support structure 91. In this way, the second touch lead portion 702 is disposed along the inclined portion (i.e., the first portion 913) of the first support structure 91, i.e., obliquely with respect to the upper surface of the base substrate 10.

The touch display panel may further include a third support structure 93, and the third support structure 93 may also be located on the second planarization layer PLN 2. I.e. the second support structure 92 and the third support structure 93 are located at the same layer. The third supporting structure 93 is spaced apart from the second supporting structure 92, and the third supporting structure 93 is located on a side of the second supporting structure 92 away from the display area AA. The contact groove 80 is formed between the third support structure 93 and the second support structure 92.

The orthographic projection of the third touch lead portion 703 on the substrate base 10 is not substantially overlapped with the orthographic projection of the first support structure 91 on the substrate base 10, and the orthographic projection of the third touch lead portion 703 on the substrate base 10 is at least partially overlapped with the orthographic projection of the third support structure 93 on the substrate base 10. The third touch lead portion 703 extends substantially parallel with respect to the upper surface of the base substrate 10.

Referring to fig. 8, the touch lead 70 has an upper surface away from the substrate base 10, corresponding to a first touch lead portion 701, a second touch lead portion 702, and a third touch lead portion 703, the first touch lead portion 701 has a first lead surface 7011 away from the substrate base 10, the second touch lead portion 702 has a second lead surface 7021 away from the substrate base 10, and the third touch lead portion 703 has a third lead surface 7031 away from the substrate base 10.

The second lead surface 7021 extends obliquely with respect to the upper surface of the base substrate 10. The second lead surface 7021 is substantially parallel to the first portion 913 of the first surface 911. The first lead surface 7011 and the third lead surface 7031 are substantially parallel to the upper surface of the substrate base 10.

In particular, the second lead surface 7021 can have a first end 7022 proximate the display region and a second end 7023 distal the display region. The second end 7023 is lower in height than the first end 7022, i.e., the second end 7023 is closer to the upper surface of the substrate base 10 than the first end 7022 in a direction perpendicular to the upper surface of the substrate base 10.

For example, the touch lead 70 has substantially the same thickness throughout its extended length. Thus, the slope of the second lead surface 7021 is substantially equal to the slope of the first portion 913 of the first surface 911. A difference in height between the second end 7023 and the first end 7022 of the second lead surface 7021 is substantially equal to a difference in height between the second end 9132 and the first end 9131 of the first portion 913. That is, the height difference between the second end 7023 and the first end 7022 of the second lead surface 7021 can also be between 0.5 and 10 microns.

In the embodiment of the present disclosure, the second lead surface 7021 of the touch lead 70 is formed as the bottom of the contact groove 80, and thus, the bottom of the contact groove 80 also extends obliquely with respect to the upper surface of the base substrate 10. The slope of the bottom of the contact groove 80 is substantially equal to the slope of the first portion 913 of the first surface 911. The side of the second support structure 92 away from the display area AA and the side of the third support structure 93 near the display area AA may form at least a portion of two opposite sides of the contact groove 80, respectively.

With continued reference to fig. 8, in the peripheral region (e.g., the first frame region), the touch display panel further includes a first covering structure 94 and a second covering structure 95. The first cover structure 94 may include a portion located in at least one of the first encapsulation sublayer 201 and the third encapsulation sublayer 203. The second cover structure 95 may include a portion in the touch insulating layer 33. That is, at least one of the first and third encapsulation sublayers 201 and 203 may extend from the display area AA to the first sub-bezel area NA11, and a portion of the at least one of the first and third encapsulation sublayers 201 and 203 that extends to the first sub-bezel area NA11 forms the first cover structure 94. The touch insulating layer 33 may extend from the display area AA to the first sub-frame area NA11, and a portion of the touch insulating layer 33 extending to the first sub-frame area NA11 forms the second covering structure 95.

Fig. 9 is a cross-sectional view of the touch display panel taken along a line FF' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel during a process of forming an encapsulation layer and a touch layer, according to an embodiment of the present disclosure. With combined reference to fig. 5, 8, and 9, in an embodiment of the present disclosure, the inorganic layers in the encapsulation layer, i.e., the first encapsulation sublayer 201 and the third encapsulation sublayer 203, are formed by a chemical vapor deposition process. In the chemical vapor deposition process, a portion of the inorganic material is formed on the second lead surface 7021 of the touch lead 70, as shown in block II of fig. 9. Since the second lead surface 7021 of the touch lead 70 has an inclined structure, and the film forming property of the cvd process on the inclined structure is poor, the thickness of the inorganic material formed on the second lead surface 7021 of the touch lead 70 is thin. That is, in the chemical vapor deposition process, the thickness of the inorganic material formed on the second lead surface 7021 of the touch lead 70 may be much smaller than the thickness of the inorganic material formed on the planar structure. After the chemical vapor deposition process, the touch insulating layer 23 is patterned through a photolithography process. In the photolithography process, a portion of the touch insulating layer 23 formed in the contact groove 80 needs to be removed by an etching process. In this etching process, a certain degree of over-etching may be generally performed, and since the thickness of the inorganic material formed on the second lead surface 7021 of the touch lead 70 is thin, the inorganic material formed on the second lead surface 7021 of the touch lead 70 may be easily removed by the etching process. In this way, the touch trace 60 and the touch lead 70 formed in the subsequent process are favorably in complete contact in the contact groove 80, that is, the contact area of the touch trace 60 and the touch lead 70 in the contact groove 80 is favorably increased, and the contact performance of the touch trace 60 and the touch lead 70 is improved.

In the embodiment of the disclosure, by designing the slope α, the thickness of the inorganic material formed on the second lead surface 7021 of the touch lead 70 can be controlled, so as to be beneficial to improving the contact performance between the touch trace 60 and the touch lead 70.

In the embodiment of the present disclosure, the first covering structure 94 has a first portion 941, an orthographic projection of the first portion 941 on the substrate base plate 10 is substantially coincident with an orthographic projection of the second supporting structure 92 on the substrate base plate 10, as shown in fig. 8, the first portion 941 has an upper surface 9411 far away from the substrate base plate 10, and the upper surface 9411 is a slope. That is, the first portion 941 of the first cover structure 94 formed by the chemical vapor deposition process has an inclined upper surface. For example, the upper surface 9411 of the first portion 941 has a first end 9412 near the display area and a second end 9413 away from the display area. A second end 9413 of an upper surface 9411 of the first portion 941 is lower than a first end 9412 in height, that is, the second end 9413 is closer to the upper surface of the substrate base plate 10 than the first end 9412 in a direction perpendicular to the upper surface of the substrate base plate 10.

Accordingly, the second cover structure 95 has a first portion 951, an orthographic projection of the first portion 951 on the substrate base plate 10 substantially coincides with an orthographic projection of the second support structure 92 on the substrate base plate 10, as shown in fig. 8, the first portion 951 having an upper surface 9511 distal from the substrate base plate 10, the upper surface 9511 being a sloped surface. For example, an upper surface 9511 of the first portion 951 has a first end 9512 proximate the display area and a second end 9513 distal from the display area. A second end 9513 of an upper surface 9511 of the first part 951 is lower in height than the first end 9512, i.e., the second end 9513 is closer to the upper surface of the substrate base plate 10 than the first end 9512 in a direction perpendicular to the upper surface of the substrate base plate 10.

With continued reference to fig. 8, the second support structure 92, the first cover structure 94 and the second cover structure 95 respectively have sides far away from the display area AA, and the sides of the second support structure 92, the first cover structure 94 and the second cover structure 95 respectively form a portion of the side surface of the contact groove 60 near the display area AA. The orthographic projections of the lateral faces of the second support structure 92, the first cover structure 94 and the second cover structure 95 on the substrate base plate 10 all fall within the orthographic projection of the second portion 914 of the first surface 911 on the substrate base plate 10. That is, the second support structure 92, the first cover structure 94 and the second cover structure 95 terminate substantially at a planar position of the first support structure 91, or, stated otherwise, at a starting position of the slope of the first support structure 91.

The touch trace 60 is located on a side of the second covering structure 95 away from the substrate 10. The touch trace 60 includes a first touch trace portion 601 located in the contact groove 80, and the touch trace 60 further includes a third touch trace portion 602, where the third touch trace portion 602 is located on a side of the first touch trace portion 601 close to the display area AA.

An orthographic projection of the first touch trace portion 601 on the substrate 10 is at least partially overlapped with an orthographic projection of the second touch lead portion 702 on the substrate 10, for example, the orthographic projection of the first touch trace portion 601 on the substrate 10 is substantially overlapped with an orthographic projection of the second touch lead portion 702 on the substrate 10.

The first touch trace portion 601 directly contacts the second touch lead portion 702 in the contact groove 80. In the embodiment of the disclosure, a dimension of a contact portion of the first touch trace portion 601 and the second touch lead portion 702 along an extending direction thereof is substantially equal to a dimension of the first portion 913 along the extending direction thereof. And the size of the contact portion between the first touch trace portion 601 and the second touch lead portion 702 along the first direction X is substantially equal to the size of the orthographic projection of the first portion 913 on the substrate base (i.e. the above L). That is to say, since there is no insulating material such as inorganic material left in the contact groove 80, the first touch trace portion 601 and the second touch lead portion 702 are in full contact in the contact groove 80, so that a larger contact area between the first touch trace portion 601 and the second touch lead portion 702 can be ensured, and the contact performance therebetween can be improved.

In the embodiment of the present disclosure, the second lead surface 7021 of the touch lead 70 is formed as the bottom of the contact groove 80 such that the bottom of the contact groove 80 extends obliquely with respect to the upper surface of the base substrate 10. In this way, the first touch trace portion 601 of the touch trace 60 also extends obliquely with respect to the upper surface of the base substrate 10.

Fig. 10 schematically shows a schematic diagram comparing the oblique extension and the horizontal extension of the contact portion of the touch trace with the touch lead. Referring to fig. 10, in a case that the contact portion of the touch trace with the touch lead extends horizontally, a width of the contact portion of the touch trace with the touch lead along an extending direction (i.e., a horizontal direction) thereof may be denoted as L1; under the condition that the contact portion of the touch trace with the touch lead extends obliquely, an oblique angle (i.e., a slope) of the contact portion of the touch trace with the touch lead is denoted as α, and a width of the contact portion of the touch trace with the touch lead along an extending direction (i.e., an oblique direction) thereof may be denoted as L2.

Under the condition that the contact portion of the touch trace with the touch lead extends horizontally, the width of the border area occupied by the contact portion of the touch trace with the touch lead is L1. Under the condition that the contact portion of the touch trace with the touch lead extends obliquely, the width of the frame area occupied by the contact portion of the touch trace with the touch lead is L2 × cos α. For example, when the slope α is about 21.8 °, cos α is about equal to 0.93. If the width of the contact portion of the touch trace with the touch lead along the extending direction of the touch trace is kept unchanged, that is, the contact area of the touch trace with the touch lead is kept unchanged, that is, L2 is L1, the width of the frame area occupied by the contact portion can be 0.93, that is, the frame width can be reduced by about 7%. Therefore, in the embodiment of the disclosure, the width of the frame region can be effectively reduced by the inclined arrangement, which is beneficial to realizing a display device with a narrow frame.

Fig. 11 is a cross-sectional view of a touch display panel according to other exemplary embodiments of the present disclosure, taken along line FF' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel extending from a display area to a peripheral area. It should be noted that, differences of the embodiment shown in fig. 11 with respect to the above embodiment will be mainly described below, and the same points may refer to the above description, which is not repeated herein.

Referring collectively to fig. 2, 8 and 11, in some embodiments of the present disclosure, the first support structure 91 is not limited to being located in the first planarization layer PLN 1.

For example, the first support structure 91 may include a structure located in at least one other film layer than the first planarization layer PLN 1.

For example, the first support structure 91 may include a structure located in a plurality of film layers, wherein a portion of the first support structure 91 may be located in the first planarization layer PLN1 and another portion of the first support structure 91 may be located in at least one other film layer than the first planarization layer PLN 1.

For example, the first support structure 91 may be formed through the same patterning process as a film layer located in the display area AA, or the first support structure 91 may be formed through a different patterning process from a film layer located in the display area AA, i.e., the first support structure 91 may be separately formed.

In the embodiment shown in fig. 11, the first support structure 91 may include a first surface 911 remote from the substrate base plate 10 and a second surface 912 proximate to the substrate base plate 10. The second surface 912 is planar, i.e., the second surface 912 is substantially parallel to the upper surface of the base substrate 10.

At least a portion of the first surface 911 is beveled. Specifically, the first surface 911 includes a first portion 913 and a second portion 914, and the second portion 914 is closer to the display area AA than the first portion 913. The second portion 914 is planar, i.e., the second portion 914 is substantially parallel to the upper surface of the substrate base plate 10. The first portion 913 is a slope, that is, the first portion 913 is not parallel to the upper surface of the substrate 10 and has a certain inclination angle with respect to the upper surface of the substrate 10.

The first portion 913 of the first surface 911 has a first end 9131 proximate the display area and a second end 9132 distal from the display area. The second end 9132 is lower in height than the first end 9131, that is, the second end 9132 is closer to the upper surface of the substrate base 10 than the first end 9131 in a direction perpendicular to the upper surface of the substrate base 10.

For example, the thickness of the second portion 914 of the first support structure 91 can be between 1 micron and 50 microns, such as about 1.5 microns, 2 microns, 3 microns, 5 microns, 8 microns, 10 microns, 15 microns, 20 microns, 30 microns, 40 microns, 50 microns. The thickness of the first portion 913 at the first end 9131 is substantially equal to the thickness of the second portion 914. The thickness of the first portion 913 at the second end 9132 is less than the thickness of the first portion 913 at the first end 9131. In some exemplary embodiments, the thickness of the first portion 913 at the second end 9132 is less than 1 micron, e.g., less than 0.5 microns, or may be substantially equal to 0. That is, the height difference between the second end 9132 and the first end 9131 can be between 0.5 and 50 micrometers.

In an embodiment of the present disclosure, the slope of the first portion 913 of the first surface 911 (i.e., the angle of inclination of the first portion 913 of the first surface 911 with respect to horizontal) α is less than a prescribed slope threshold. The slope α of the first portion 913 of the first surface 911 is related to the height difference between the second end 9132 and the first end 9131 and the width of the orthographic projection of the first portion 913 on the substrate base. For example, tan α is H/L, where H is a height difference between the second end 9132 and the first end 9131, and L is a width of an orthogonal projection of the first portion 913 on the substrate base.

For example, in some examples, L can be between 10-50 microns, such as about 10 microns, about 20 microns, 25 microns, 30 microns, 40 microns, 50 microns. For example, L may be about 30 microns and H may be about 15 microns, in which case tan α is 0.5 and the slope α of the first portion 913 of the first surface 911 is about 26.6 °. For example, when the slope α is about 26.6 °, if the width of the contact portion of the touch trace with the touch lead along the extending direction thereof is kept constant, that is, the contact area of the touch trace with the touch lead is kept constant, that is, L2 is L1, the width of the bezel area occupied by the contact portion can be 0.89, that is, the bezel width can be reduced by about 11%.

By the mode, the gradients of the touch routing and the touch lead wire positioned in the contact groove can be further increased, so that the width of the frame of the touch display panel can be reduced more favorably.

Fig. 16 is a cross-sectional view of a touch display panel according to some exemplary embodiments of the present disclosure, taken along a line FF' in fig. 2, schematically illustrating a cross-sectional structure of the touch display panel extending from a display region to a first sub-bezel region, a bending region, and a second sub-bezel region. It is to be noted that, hereinafter, differences with respect to the above-described embodiment will be mainly described, and other portions may refer to the description of the above-described embodiment.

With reference to fig. 2, fig. 8 and fig. 16, in the peripheral area (for example, the first bezel area), the touch display panel includes a touch trace 60, and the touch trace 60 is electrically connected to the touch electrode and extends from the display area AA to the first sub-bezel area NA 11. For example, the touch trace 60 is disposed on a side of the package layer 20 away from the substrate 10. The touch trace 60 may be located in at least one of the first touch layer 31 and the second touch layer 32. For example, the touch trace 60 can be located in the second touch layer 32.

In the peripheral region (e.g., the first bezel region), the touch display panel further includes a touch lead 70, and the touch lead 70 extends from the first sub-bezel region NA11 to the second sub-bezel region NA 12. For example, the touch lead 70 may be located in the fourth conductive layer 44. Referring to fig. 16, the touch lead 70 may extend from the first sub-bezel area NA11 to the second sub-bezel area NA12 through the bending area B.

As shown in fig. 16, the touch display panel may include a contact groove 80. The other end of the touch trace 60 is electrically connected to the touch lead 70 through the contact groove 80. For example, the contact groove 80 may be located in the first sub-bezel area NA11, and more particularly, the contact groove 80 may be located between the blocking dam and the bending area B described above.

In this embodiment, in the contact groove 80, the touch trace 60 is in contact with one end of the touch lead 70, so as to achieve the electrical connection between the touch trace 60 and the touch lead 70.

The touch display panel may include a contact groove 800. For example, the contact groove 800 may be located in the second sub-bezel area NA12, i.e., on a side of the bending area B away from the display area AA.

The touch display panel includes another touch trace 600. For example, the other touch trace 600 can be located at the same layer as the touch trace 60. That is, the other touch trace 600 may be located in at least one of the first touch layer 31 and the second touch layer 32. For example, another touch trace 600 can be located in the second touch layer 32.

In the contact groove 800, the other end of the touch lead 70 contacts another touch trace 600, so as to achieve electrical connection between the touch lead 70 and the another touch trace 600.

In this way, the touch-control wires in the touch-control layer are changed to the touch-control lead wires in the fourth conductive layer in the bending area B, so that the touch-control lead wires are prevented from being broken when the bending area B is bent; then, after passing through the bending region B, the touch lead in the fourth conductive layer is replaced to another touch trace in the touch layer, which is favorable for the electrical connection between the touch trace and an external circuit.

In the embodiment shown in fig. 16, the touch lead 70 in the contact groove 800 contacts another touch trace 600 in a planar manner. For example, in the contact groove 800, the contact manner of the touch lead 70 and the other touch trace 600 may refer to the contact manner in the contact groove 80, that is, at least one of the inclined plane contact manner and the side surface contact manner, and here, the above description of the embodiment of the contact groove 80 may be referred to, and is not repeated here.

Fig. 17 is a schematic diagram of a display device according to some exemplary embodiments of the present disclosure. The display device 100 includes the touch display panel. For example, the display area AA and the peripheral area NA are included, and the film structures in the display area AA and the peripheral area NA may refer to the descriptions of the above embodiments, and are not described herein again.

The display means may comprise any device or product having a display function. For example, the display device may be a smart phone, a mobile phone, an e-book reader, a desktop computer (PC), a laptop PC, a netbook PC, a Personal Digital Assistant (PDA), a Portable Multimedia Player (PMP), a digital audio player, a mobile medical device, a camera, a wearable device (e.g., a head-mounted device, an electronic apparel, an electronic bracelet, an electronic necklace, an electronic accessory, an electronic tattoo, or a smart watch), a television, or the like.

It should be understood that the display device according to the embodiments of the present disclosure has all the features and advantages of the touch display panel, and particularly, refer to the above description.

Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.

Claims (26)

1. A touch display panel, comprising:

the display device comprises a substrate base plate, a display panel and a display panel, wherein the substrate base plate comprises a display area and a peripheral area at least positioned on at least one side of the display area;

a plurality of pixel units disposed in the display region, the pixel units including a pixel driving circuit and a light emitting element electrically connected to the pixel driving circuit, the light emitting element including a first electrode;

a plurality of touch electrodes disposed in the display area;

the touch wire is electrically connected with at least one touch electrode, and at least one part of the touch wire extends to the peripheral area;

the touch lead is arranged in the peripheral area, and the touch lead and the touch routing are positioned in different conductive layers;

a contact groove in the peripheral region, the touch trace contacting the touch lead in the contact groove,

the touch trace is provided with a first touch trace part positioned in the contact groove, the substrate base plate is provided with an upper surface close to the pixel unit, and the first touch trace part obliquely extends relative to the upper surface of the substrate base plate.

2. The touch display panel of claim 1, wherein the first touch trace portion is located on a bottom of the contact groove.

3. The touch display panel according to claim 2, wherein the touch lead has a first touch lead portion and a second touch lead portion, the second touch lead portion forms a groove bottom of the contact groove, the first touch lead portion is located on a side of the second touch lead portion close to the display area, the first touch lead portion extends in parallel with respect to an upper surface of the substrate base, and the second touch lead portion extends obliquely with respect to the upper surface of the substrate base.

4. The touch display panel of claim 1, wherein the first touch trace portion is located on a groove sidewall of the contact groove.

5. The touch display panel according to claim 4, wherein the touch lead has a first touch lead portion, a second touch lead portion, and a fourth touch lead portion, the second touch lead portion forming a bottom of the contact groove, the fourth touch lead portion forming a part of a groove sidewall of the contact groove, the first touch lead portion being located on a side of the second touch lead portion close to the display area, the fourth touch lead portion being located between the first touch lead portion and the second touch lead portion;

the first touch lead portion extends in parallel with respect to the upper surface of the substrate base, the second touch lead portion extends in parallel with respect to the upper surface of the substrate base, and the fourth touch lead portion extends obliquely with respect to the upper surface of the substrate base; and

the first touch routing part is in contact with the fourth touch lead part.

6. The touch display panel according to claim 5, wherein the touch trace further has a second touch trace portion located in the contact groove, and the second touch trace portion is in contact with the second touch lead portion.

7. The touch display panel according to claim 3, wherein a width of a contact portion between the first touch trace portion and the second touch lead portion along an extending direction of the first touch trace portion is equal to a width of the contact groove along the extending direction of the first touch trace portion.

8. The touch display panel according to claim 6, wherein a width of a contact portion between the second touch trace portion and the second touch lead portion along an extending direction of the second touch trace portion is equal to a width of the contact groove along the extending direction of the second touch trace portion.

9. The touch display panel of claim 3, further comprising a first support structure comprising a first surface remote from the substrate base, the first surface having a first portion, wherein an orthographic projection of the contact slot on the substrate base substantially coincides with an orthographic projection of the first portion of the first surface on the substrate base;

a first portion of the first surface extends obliquely with respect to an upper surface of the substrate base.

10. The touch display panel of claim 9, wherein the first portion of the first surface has a first end near the display area and a second end far from the display area, and wherein a height of the first portion of the first surface at the second end is less than a height of the first portion of the first surface at the first end.

11. The touch display panel according to claim 10, wherein a height difference between the first end and the second end of the first portion of the first surface is between 0.5 and 50 μm.

12. The touch display panel of claim 11, wherein the second touch lead portion is in direct contact with the first portion of the first surface.

13. The touch display panel according to claim 5, further comprising a first support structure, wherein the fourth touch lead is partially located on a sidewall of the first support structure away from the display area.

14. The touch display panel of claim 13, wherein the first support structure comprises a first surface remote from the base substrate, the first surface having a first portion, the first portion of the first surface extending obliquely with respect to the upper surface of the base substrate;

the fourth touch lead portion is in contact with the first portion of the first surface.

15. The touch display panel according to claim 10 or 14, wherein the first surface further has a second portion located on a side of the first portion of the first surface close to the display area, the second portion of the first surface extending in parallel with respect to the upper surface of the substrate base.

16. The touch display panel of claim 15, further comprising a second support structure located on a side of the first support structure away from the substrate base, an orthographic projection of the second support structure on the substrate base at least partially overlapping an orthographic projection of a second portion of the first surface on the substrate base; and

a portion of the first touch lead portion is sandwiched between the first support structure and the second support structure.

17. The touch display panel of claim 16, further comprising a first encapsulation sub-layer, a second encapsulation sub-layer, and a third encapsulation sub-layer disposed sequentially away from the substrate base;

the touch display panel further comprises a first covering structure located in the peripheral region, and the first covering structure is located in at least one of the first packaging sublayer and the third packaging sublayer; and

an orthographic projection of a side of the first covering structure, which is far away from the display area, on the substrate falls into an orthographic projection of a second part of the first surface on the substrate.

18. The touch display panel of claim 16, wherein the first touch lead portion is in direct contact with the second portion of the first surface.

19. The touch display panel according to any one of claims 1 to 6, wherein the light-emitting element further comprises a second electrode and a light-emitting layer provided between the first electrode and the second electrode, the pixel driving circuit comprises a storage capacitor and at least one thin film transistor provided on the substrate, the thin film transistor comprises an active layer, a gate electrode, a source electrode, and a drain electrode, and the storage capacitor comprises a first plate and a second plate;

wherein the touch display panel includes:

the first conducting layer is arranged on one side, away from the substrate, of the active layer, and the grid electrode and the first polar plate are located on the first conducting layer;

the second conducting layer is arranged on one side, away from the substrate, of the first conducting layer, and the second pole plate is located on the second conducting layer;

the third conducting layer is arranged on one side, away from the substrate, of the second conducting layer, and the source electrode and the drain electrode are located on the third conducting layer;

a fourth conductive layer disposed on a side of the third conductive layer away from the substrate base plate, a connection portion for electrically connecting the pixel driving circuit and the first electrode of the light emitting element being located in the fourth conductive layer,

wherein the touch lead is located on the fourth conductive layer.

20. The touch display panel according to claim 17, further comprising: the first touch layer is positioned on the third packaging sub-layer and far away from the substrate base plate; and a second touch layer located on the side of the first touch layer away from the substrate base plate,

the touch routing is located on the first touch layer or the second touch layer.

21. The touch display panel of claim 20, further comprising a first planarizing layer between the third conductive layer and the fourth conductive layer, wherein the first support structure is on the first planarizing layer.

22. The touch display panel of claim 21, further comprising a second planarizing layer between the fourth conductive layer and the first electrode, wherein the second support structure is on the second planarizing layer.

23. The touch display panel of claim 21, wherein the touch display panel comprises a plurality of insulating layers between the fourth conductive layer and the base substrate, and wherein the first support structure comprises a structure in at least one of the plurality of insulating layers.

24. The touch display panel of claim 21, wherein the first support structure comprises a first sub-support structure and a second sub-support structure, the first sub-support structure is located on the third conductive layer, and the second sub-support structure is located on the first planarization layer.

25. The touch display panel of claim 17, wherein the first overlay structure comprises a first portion, and an orthographic projection of the first portion of the first overlay structure on the substrate base plate falls within an orthographic projection of the second support structure on the substrate base plate;

the first portion of the first cover structure has a first surface distal from the base substrate, the first surface of the first portion of the first cover structure extending obliquely relative to the upper surface of the base substrate.

26. A display device, characterized in that: comprising the touch display panel according to any one of claims 1 to 25.

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