Touch display panel and display device

Abstract

A touch display panel and a touch device. The touch display panel comprises a display area (AA) and a peripheral area (WA); a display substrate (PNL) of the display panel comprises a light-emitting device (LD) located in the display area (AA) and a blocking dam, and a binding portion (BA) is located outside the blocking dam; an encapsulation layer (TFE) comprises a first inorganic layer (CVD1), a second inorganic layer (CVD2), and an organic layer (IJP) disposed between the first inorganic layer (CVD1) and the second inorganic layer (CVD2); a touch layer (TSP) is arranged on the surface of the encapsulation layer (TFE) away from the display substrate (PNL); the touch layer (TSP) comprises a touch electrode and touch leads (TL); each touch lead (TL) is at least divided into a main body section (TLm) and a lead-out section (TLf), the main body section (TLm) is connected to the touch control electrode, and the lead-out section (TLf) is connected to the binding portion (BA); each touch lead (TL) comprises a plurality of layers of wire bodies arranged at intervals, and two adjacent layers of wire bodies overlap and are connected; the main body section (TLm) comprises the layers of wire bodies of the corresponding touch lead (TL), and the lead-out section (TLf) comprises only one layer of wire bodies; or the lead-out section (TLf) comprises the layers of wire bodies of the corresponding touch lead (TL), and in the lead-out section (TLf) of the same touch lead (TL), the width of the wire body closest to the display substrate (PNL) is greater than the width of other wire bodies.

Description

Touch display panel and display device

[0001] Cross-references

[0002] This disclosure claims priority to PCT patent application No. PCT / CN2024 / 135479, filed on November 29, 2024, entitled “Display Panel and Display Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of touch technology, and more specifically, to a touch display panel and display device. Background Technology

[0004] Touch display panels are widely used in terminal devices such as mobile phones and tablets. While displaying images, they can also enable human-computer interaction through touch operations. The touch position is determined by the change of sensing capacitance to realize touch operation. However, existing touch display panels are prone to touch abnormalities.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] This disclosure provides a touch display panel and a display device.

[0007] According to one aspect of this disclosure, a touch display panel is provided, having a display area and a peripheral area located outside the display area; the peripheral area has a bonding portion; the touch display panel includes:

[0008] The display substrate includes a light-emitting device located in the display area and a barrier dam located in the peripheral area, the barrier dam surrounding the display area, and the bonding portion located outside the barrier dam;

[0009] An encapsulation layer covers the light-emitting device and includes a first inorganic layer and a second inorganic layer distributed along a direction away from the display substrate, and an organic layer disposed between the first inorganic layer and the second inorganic layer; the first inorganic layer and the second inorganic layer cover the barrier dam and extend to the outside of the barrier dam; the organic layer is located within the area surrounded by the barrier dam;

[0010] A touch layer is disposed on the surface of the encapsulation layer away from the display substrate; the touch layer includes touch electrodes located in the display area and touch leads located in the peripheral area; the extending direction of the touch leads intersects the extending direction of at least a portion of the blocking dam; the touch leads are at least divided into a main body segment and a lead-out segment along their extending direction, the main body segment is at least partially located within the area surrounded by the blocking dam and connected to the touch electrodes; the lead-out segment is at least partially located outside the area surrounded by the blocking dam and connected to the bonding portion; the touch leads include multiple layers of spaced wires, with adjacent layers of wires overlapping and connected; the main body segment includes each layer of the touch leads;

[0011] The lead-out section includes only one layer of the line body; or, the lead-out section includes each layer of the line body of the touch lead, and in the lead-out section of the same touch lead, the width of the line body closest to the display substrate is greater than the width of the other line bodies.

[0012] In one exemplary embodiment of this disclosure, the barrier dam includes a first barrier dam and a second barrier dam surrounding the first barrier dam;

[0013] The lead-out section is located on the side of the second barrier dam away from the display area.

[0014] In one exemplary embodiment of this disclosure, the main body segment extends to the side of the second barrier dam away from the display area; two adjacent layers of the main body segment are connected by at least one contact hole, and at least one contact hole is located on the side of the second barrier dam away from the display area.

[0015] In one exemplary embodiment of this disclosure, the distance between the lead-out section and the second blocking dam is not less than the length of the contact hole in the extension direction of the touch lead, and not greater than twice the length of the contact hole in the extension direction of the touch lead.

[0016] In one exemplary embodiment of this disclosure, the barrier dam includes a first barrier dam and a second barrier dam surrounding the first barrier dam;

[0017] The lead-out section overlaps with the first barrier dam and the second barrier dam.

[0018] In one exemplary embodiment of this disclosure, the barrier dam includes a first barrier dam and a second barrier dam surrounding the first barrier dam;

[0019] The lead-out section overlaps with the second barrier dam, but does not overlap with the first barrier dam.

[0020] In one exemplary embodiment of this disclosure, in the lead-out section of the same touch lead, the boundary of the orthographic projection of the line closest to the display substrate on the display substrate is located outside the orthographic projection of any other line on the display substrate.

[0021] In one exemplary embodiment of this disclosure, in the lead-out section of the same touch lead, the distance between the boundary of the orthographic projection of the line closest to the display substrate on the display substrate and the boundary of the orthographic projection of any other line on the display substrate is not less than 2 μm.

[0022] In one exemplary embodiment of this disclosure, the touch display panel further includes:

[0023] A support body is disposed in the peripheral area; the support body is located on the side of the barrier away from the display area; the encapsulation layer covers the support body and protrudes in the area corresponding to the support body.

[0024] In one exemplary embodiment of this disclosure, the display substrate further includes a driving backplane and a pixel definition layer, wherein the light-emitting devices and the pixel definition layer are disposed on the same side of the driving backplane, and the pixel definition layer is used to define the range of each of the light-emitting devices;

[0025] The touch display panel further includes a support pillar, which is disposed on the surface of the pixel definition layer away from the driving backplate; the encapsulation layer covers the pixel definition layer and the support pillar; the support body is disposed on the same layer as the support pillar.

[0026] In one exemplary embodiment of this disclosure, each of the lead-out segments is spaced apart along a first direction; the support body is a strip structure extending along a second direction, and the width of the support body in the first direction is greater than the width of the lead-out segments.

[0027] In one exemplary embodiment of this disclosure, the number of supports is at least two, and each of the supports is distributed along a first direction; at least a portion of the lead-out segments are located between the two supports.

[0028] In one exemplary embodiment of this disclosure, each of the lead-out segments is spaced apart along a first direction; the distance between the support and the barrier is equal to the distance between the lead-out segment and the barrier.

[0029] In one exemplary embodiment of this disclosure, the touch layer further includes floating dummy leads, which are located within the area surrounded by the barrier and are spaced apart from the main body segment in the same layer.

[0030] In one exemplary embodiment of this disclosure, the number of dummy leads is multiple, and any one of the main body segments is located between two adjacent dummy leads.

[0031] In one exemplary embodiment of this disclosure, the touch layer further includes a grounded shielding wire located in the peripheral area and surrounding the touch lead; the shielding wire overlaps with the blocking dam and is connected to the bonding portion; the width of at least a portion of the area of ​​the shielding wire within the range surrounded by the blocking dam is greater than the width of the touch lead.

[0032] In one exemplary embodiment of this disclosure, the width of the shielding wire in at least a portion of the area surrounded by the barrier dam is not less than 100 μm.

[0033] In one exemplary embodiment of this disclosure, the touch electrode includes a plurality of first touch electrodes and second touch electrodes. A first touch electrode includes a plurality of first electrode blocks connected in series along a first direction; each first touch electrode is spaced apart along a second direction. A second touch electrode includes a plurality of second electrode blocks distributed along the second direction and a connecting bridge connecting adjacent second electrode blocks; each second touch electrode is spaced apart along the first direction; the connecting bridge intersects with and is insulated from a first touch electrode; the first direction and the second direction intersect.

[0034] The line body includes a first line body and a second line body distributed along a direction away from the display substrate; the adapter bridge is disposed in the same layer as the first line body; the first electrode block, the second electrode and the second line body are disposed in the same layer.

[0035] In one exemplary embodiment of this disclosure, the touch layer includes:

[0036] A barrier layer covering the second inorganic layer;

[0037] The first conductive layer includes the first wire and the transition bridge;

[0038] An insulating layer covers the first conductive layer; the thickness of the insulating layer is less than that of the first conductive layer.

[0039] The second conductive layer is disposed on the surface of the insulating layer away from the first conductive layer, and includes the first electrode block, the second electrode block and the second wire.

[0040] A touch-sensitive planarization layer covers the second conductive layer.

[0041] In one exemplary embodiment of this disclosure, the touch electrode is a mesh structure with multiple holes formed by multiple channel lines, and one light-emitting device overlaps with one of the mesh holes; at least two channel lines are between at least two adjacent light-emitting devices.

[0042] In one exemplary embodiment of this disclosure, the touch display panel includes a plurality of sub-pixels, and each sub-pixel includes a light-emitting device; each sub-pixel is divided into a first sub-pixel column and a second sub-pixel column arranged alternately along a first direction;

[0043] There are at least two channel lines between two adjacent sub-pixels in the second sub-pixel column.

[0044] In one exemplary embodiment of this disclosure, each of the sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel with different emission colors; the first sub-pixel column includes the first sub-pixels and the second sub-pixels arranged alternately along a second direction; the second sub-pixel column includes a plurality of third sub-pixels arranged along the second direction.

[0045] In one exemplary embodiment of this disclosure, the spacing between two adjacent channel lines between two adjacent sub-pixels in the second sub-pixel column is not greater than the width of the channel line.

[0046] According to one aspect of this disclosure, a touch display panel is provided, having a display area and a peripheral area located outside the display area; the peripheral area has a bonding portion; the touch display panel includes:

[0047] The display substrate includes a light-emitting device located in the display area and a barrier dam located in the peripheral area, the barrier dam surrounding the display area, and the bonding portion located outside the barrier dam;

[0048] The encapsulation layer includes a first inorganic layer and a second inorganic layer distributed along a direction away from the display substrate, and an organic layer disposed between the first inorganic layer and the second inorganic layer; the first inorganic layer and the second inorganic layer cover the barrier dam and extend to the outside of the barrier dam; the organic layer is located within the area surrounded by the barrier dam.

[0049] A support body is disposed on the surface of the display substrate and located in the peripheral area; the support body is located on the side of the barrier dam away from the display area; the encapsulation layer covers the support body and protrudes in the area corresponding to the support body;

[0050] A touch layer is disposed on the surface of the encapsulation layer away from the display substrate; the touch layer includes touch electrodes located in the display area and touch leads located in the peripheral area; the extending direction of the touch leads intersects the extending direction of at least a portion of the blocking dam; the touch leads connect the touch electrodes and the bonding portion.

[0051] In one exemplary embodiment of this disclosure, the display substrate further includes a driving backplane and a pixel definition layer, wherein the light-emitting devices and the pixel definition layer are disposed on the same side of the driving backplane, and the pixel definition layer is used to define the range of each of the light-emitting devices;

[0052] The touch display panel further includes a support pillar, which is disposed on the surface of the pixel definition layer away from the driving backplate; the encapsulation layer covers the pixel definition layer and the support pillar; the support body is disposed on the same layer as the support pillar.

[0053] According to one aspect of this disclosure, a display device is provided, comprising the touch display panel described in any of the preceding claims.

[0054] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0055] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0056] Figure 1 is a top view schematic diagram of one embodiment of the touch display panel of this disclosure.

[0057] Figure 2 is a schematic diagram of the touch electrodes in one embodiment of the touch display panel of this disclosure.

[0058] Figure 3 is a partial cross-sectional schematic diagram of the display area in one embodiment of the touch display panel of this disclosure.

[0059] Figure 4 is a partial schematic diagram of a first type of first embodiment of the touch display panel of this disclosure.

[0060] Figure 5 is a cross-sectional view of Figure 4 (AA section).

[0061] Figure 6 is a partial schematic diagram of the substrate to the first conductive layer shown in Figure 4.

[0062] Figure 7 is a partial schematic diagram of a second embodiment of the first type of touch display panel of this disclosure.

[0063] Figure 8 is a cross-sectional view of Figure 7 (AA section).

[0064] Figure 9 is a partial schematic diagram of the third embodiment of the first type of touch display panel of this disclosure.

[0065] Figure 10 is a cross-sectional view of Figure 9 (AA section).

[0066] Figure 11 is a partial schematic diagram of the first embodiment of the second type of implementation of the touch display panel of this disclosure.

[0067] Figure 12 is a cross-sectional view of AA in Figure 11.

[0068] Figure 13 is an enlarged view of part B in Figure 11.

[0069] Figure 14 is a partial schematic diagram of the display substrate to the first conductive layer in Figure 11.

[0070] Figure 15 is a partial schematic diagram of a second embodiment of the second type of implementation of the touch display panel of this disclosure.

[0071] Figure 16 is a partial schematic diagram of one embodiment of the touch display panel of this disclosure.

[0072] Figure 17 is a cross-sectional view of Figure 16.

[0073] Figure 18 is a partial enlarged view of the touch electrodes in one embodiment of the touch display panel of this disclosure. Detailed Implementation

[0074] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0075] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0076] In this document, the first direction X and the second direction Y are simply two intersecting directions; for example, the first direction X and the second direction Y are perpendicular to each other. Although the first direction X in the accompanying drawings of this disclosure is horizontal and the second direction Y is vertical, this is not a limitation. If the display panel is rotated, the actual orientation of the first direction X and the second direction Y may change.

[0077] In this paper, "overlapping" of features A and B means that the orthographic projections of features A and B on a plane at least partially coincide. "Non-overlapping" of features A and B means that the orthographic projections of features A and B on a plane do not overlap in any region; this plane can be the surface of the display substrate, the surface of the substrate, etc.

[0078] In this article, "same layer setting" means that A and B belong to different regions that are continuous or discontinuous within the same film layer, and each region can be formed simultaneously; "different layers" means that A and B belong to different film layers, and different film layers refer to film layers that are formed at different times.

[0079] This disclosure provides a touch display panel, as shown in FIG1, which may include a display area AA and a peripheral area WA located outside the display area AA. The peripheral area WA may be a continuous annular area surrounding the display area AA, or it may be a discontinuous area surrounding the display area AA, for example, the peripheral area WA may be distributed on both sides of the display area AA. The display area AA may be used to emit light to display images, while the peripheral area WA may not emit light.

[0080] In some embodiments of this disclosure, the peripheral region WA has a bonding portion BA, which may have multiple conductive contacts. These conductive contacts can be bonded to a touch driver chip. Simultaneously, at least a portion of the conductive contacts of the bonding portion BA can be connected to a panel bonding portion of the peripheral region WA. The panel bonding portion also has multiple conductive contacts and can be connected to a flexible circuit board via its conductive contacts. This flexible circuit board can be connected to a control circuit board, thereby connecting the touch display panel and the control circuit board. The touch display panel can be controlled to display images via the control circuit board and the touch driver chip. Of course, in other embodiments of this disclosure, the touch driver chip can also be disposed on the aforementioned flexible circuit board or control circuit board, and correspondingly, the bonding portion BA of the peripheral region WA can be directly connected to the flexible circuit board.

[0081] The touch display panel includes a display substrate PNL and a packaging layer TFE, wherein:

[0082] As shown in Figure 3, the display substrate PNL may include a driving backplate BP and multiple light-emitting devices LD disposed on one side of the driving backplate BP, wherein:

[0083] The driving backplane BP has a driving circuit that drives the light-emitting device LD to emit light to display an image. In some embodiments of this disclosure, the driving backplane BP may include a substrate SU and a circuit layer CL located on one side of the substrate SU. The substrate SU may be a flat plate structure, and its material may be a rigid material such as glass or a flexible material such as polyimide. Furthermore, the substrate SU may be a single-layer or multi-layer structure.

[0084] The circuit layer CL includes the aforementioned driving circuitry. For example, the driving circuitry may include pixel circuitry located in the display area AA and peripheral circuitry located in the peripheral area WA. The pixel circuitry can be a 7T1C, 8T1C, or similar structure, as long as it can drive the light-emitting diodes (LDs) to emit light. No special limitations are placed on its structure here. Here, nTmC indicates that one pixel circuit includes n thin-film transistors (represented by the letter "T") and m capacitors (represented by the letter "C"). The number of pixel circuits can be the same as the number of light-emitting diodes (LDs), and they are connected one-to-one with each LD. Of course, multiple LDs can be connected to the same pixel circuit; no special limitations are placed here.

[0085] The peripheral circuit is connected to the pixel circuit and is used to input driving signals to the pixel circuit in order to control the light-emitting device (LD) to emit light. The peripheral circuit may include a gate driving circuit and a light-emitting control circuit, and of course, it may also include other circuits. The specific structure of the peripheral circuit is not specifically limited here.

[0086] The aforementioned driving circuit may include multiple thin-film transistors (TFTs) and capacitors. The TFTs may be top-gate or bottom-gate type TFTs. Each TFT may include an overlapping active layer and a gate, with the active layers of each TFT disposed on the same semiconductor layer; alternatively, they may be disposed on multiple semiconductor layers, with the active layers of different TFTs distributed on different semiconductor layers. The material of the semiconductor layer may be polycrystalline silicon or metal oxide, without special limitation.

[0087] The circuit layer CL may also include traces for transmitting signals that are connected to pixel circuits and peripheral circuits. For example, a column of pixel circuits may be connected to a data line extending along the second direction Y. Data signals can be transmitted through the data line. The data line may extend to the peripheral area WA and be connected to the bonding part BA. The gate driving circuit and the light emission control circuit may be connected to multiple traces such as clock signal lines. These traces may also extend to the peripheral area WA and be connected to the bonding part BA.

[0088] As shown in Figure 3, taking a top-gate thin-film transistor as an example, in some embodiments, the circuit layer CL may include a semiconductor layer, a first gate insulating layer, a first gate layer, a second gate insulating layer, a second gate layer, an interlayer dielectric layer, a first source / drain layer, a passivation layer, a first planarization layer, a second source / drain layer, and a second planarization layer PLN2, which are sequentially stacked along the direction away from the substrate SU; wherein:

[0089] The active layer of the thin-film transistor is located on the semiconductor layer, the gate is located on the first gate layer, the two plates of the capacitor are located on the first gate layer and the second gate layer, the first source-drain layer and the second source-drain layer are used to realize the connection between at least some of the thin-film transistors and between the thin-film transistors and the capacitor, and are used to transmit drive signals. The type of drive signal and the specific pattern of each film layer depend on the specific configuration of the drive circuit and are not specifically limited here.

[0090] In other embodiments, based on the above embodiments, the circuit layer CL may further include a third source / drain layer and a third planarization layer. The third source / drain layer is disposed on the surface of the second planarization layer away from the substrate. The third planarization layer covers the third source / drain layer. The third source / drain layer is also used to realize connections between at least some thin-film transistors and between thin-film transistors and capacitors. The specific pattern depends on the specific structure of the driving circuit.

[0091] In other embodiments, the circuit layer CL may not employ the aforementioned second source / drain layer, second planarization layer, third source / drain layer, and third planarization layer. Instead, it may only consist of a semiconductor layer, a first gate insulating layer, a first gate layer, a second gate insulating layer, a second gate layer, an interlayer dielectric layer, a first source / drain layer, a passivation layer, and a first planarization layer, stacked sequentially in a direction away from the substrate SU. In other words, the circuit layer CL only needs to have at least one source / drain layer and one planarization layer.

[0092] As shown in Figure 3, the light-emitting device (LD) can be an OLED (Organic Light-Emitting Diode) using organic light-emitting materials, or a Mini LED (sub-millimeter light-emitting diode, size 100μm-200μm), Micro LED (micro light-emitting diode, size no larger than 100μm), or LED (light-emitting diode, size larger than 200μm) using inorganic light-emitting materials. No special limitations are imposed here, as long as it can emit light. The LD is located within the display area AA. Of course, some LDs can also be located in the peripheral area WA, but the LDs located in the peripheral area WA can be floating and therefore do not emit light.

[0093] As shown in Figure 3, taking an OLED as an example, the light-emitting device (LD) may include a first electrode (ANO), a light-emitting layer (EL), and a second electrode (CAT) stacked sequentially along the direction away from the driving backplane (BP). By applying an electrical signal to the first electrode (ANO) and the second electrode (CAT), the light-emitting layer (EL) can be excited to emit light; the specific light-emitting principle will not be detailed here. The first electrode (ANO) can serve as the anode, and the second electrode (CAT) can serve as the cathode; both are made of conductive materials such as metals and metal oxides. The light-emitting layer (EL) may include a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer stacked sequentially along the direction away from the driving backplane (BP). Of course, other structures can also be used, as long as they can cooperate with the first electrode (ANO) and the second electrode (CAT) to emit light.

[0094] As shown in Figure 3, the display substrate may further include a pixel definition layer (PDL) separating the light-emitting devices (LDs). The PDL may be disposed on the same surface as the driving backplane (BP) as the LDs. For example, the PDL and the first electrodes (ANOs) may be disposed on the surface of the second planarization layer (PLN2) away from the substrate (SU). Furthermore, the thickness of the PDL is greater than the thickness of the first electrodes (ANOs), and the PDL has pixel openings that expose each of the first electrodes (ANOs), with one pixel opening exposing one first electrode (ANO).

[0095] As shown in Figure 3, each light-emitting device (LD) is defined by the pixel definition layer (PDL). The range of the pixel opening is the range of the light-emitting device (LD). That is, the shape and size of the orthographic projection of the pixel opening onto the substrate (SU) is the shape and size of the orthographic projection of the light-emitting device (LD) onto the substrate (SU).

[0096] Furthermore, the light-emitting layer (EL) of the light-emitting device (LD) can be formed using a photomask through a vapor deposition process. To support the photomask, support pillars (PS) can be placed on the surface of the pixel definition layer (PDL) away from the driving backplane (BP). During the vapor deposition of the EL layer, the photomask can be placed on the support pillars (PS). Both the support pillars (PS) and the pixel definition layer (PDL) can be made of organic materials such as resin, and the two materials can be the same.

[0097] As shown in Figures 2-4, the display substrate PNL may further include a barrier dam located within the peripheral region WA. The barrier dam can be an annular protruding ridge structure surrounding the display region AA. The number of barrier dams can be one, two, or more, and they are distributed sequentially at intervals along a direction away from the display region AA. Simultaneously, the barrier dam can be formed directly on the surface of the driving backplane BP, or it can be formed using a portion of the film layer of the display substrate to simplify the process. In some embodiments of this disclosure, the barrier dam can be formed simultaneously with the formation of the display substrate. The barrier dam can be a multilayer structure and can be formed simultaneously with the planarization layer and pixel definition layer PDL of the driving backplane BP. For example:

[0098] In some implementations, as shown in Figures 2-4, the blocking dam includes the first blocking dam Dam1 and the second blocking dam Dam2 mentioned above; the planarization layer of the driving backplane BP has two layers, namely the first planarization layer PLN1 and the second planarization layer PLN2 mentioned above. The first blocking dam Dam1 can be a single-layer structure, which can be set on the same layer as the second planarization layer PLN2 so that they can be formed simultaneously; the second blocking dam Dam2 can be a multi-layer structure, in which there is one layer that can be set on the same layer as the second planarization layer PLN2, and another layer that can be set on the same layer as the pixel definition layer PDL so that they can be formed simultaneously, and the thickness of the second blocking dam Dam Dam2 can be greater than the thickness of the first blocking dam Dam Dam1.

[0099] As shown in Figures 3 and 4, the TFE encapsulation layer covers each light-emitting device (LD) to block external moisture and oxygen, preventing the LD from being corroded. The TFE encapsulation layer can be a thin-film encapsulation method, and it may include a first inorganic layer CVD1, an organic layer IJP, and a second inorganic layer CVD2, wherein:

[0100] The first inorganic layer CVD1 can cover each light-emitting device (LD), that is, the first inorganic layer CVD1 can cover the surface of the second electrode CAT away from the driving backplane BP. The material of the first inorganic layer CVD1 can include inorganic insulating materials such as silicon nitride and silicon oxide. The thickness of the first inorganic layer CVD1 is less than the thickness of the barrier dam, and it covers the barrier dam and extends at least to the outside of the barrier dam. For example, for the first barrier dam Dam1 and the second barrier dam Dam2, the boundary of the first inorganic layer CVD1 can be located outside the second barrier dam Dam2.

[0101] The organic layer IJP can be disposed on the surface of the first inorganic layer CVD1 away from the driving backplane BP, and under the obstruction of the barrier dam, the boundary of the organic layer IJP is located inside the barrier dam, that is, on the side closer to the display area AA; the boundary of the orthographic projection of the organic layer IJP on the driving backplane BP can be located in the peripheral area WA, ensuring that the organic layer IJP can cover each light-emitting device LD. For example, the organic layer IJP can be limited to the area surrounded by the first barrier dam Dam1.

[0102] However, it should be noted that due to factors such as process errors, in the case of multiple barrier dams, the organic layer IJP may locally cross some barrier dams, but at least not cross the outermost barrier dam. For example, the organic layer IJP may locally cross the first barrier dam Dam1 and extend to the area between the second barrier dam Dam2 and the first barrier dam Dam1, but not cross the second barrier dam Dam2.

[0103] The second inorganic layer CVD2 can cover the organic layer IJP and the first inorganic layer CVD1, which is not covered by the organic layer IJP. The second inorganic layer CVD2 can block water and oxygen intrusion, and planarization is achieved by the organic layer IJP, which is fluid before curing. The material of the second inorganic layer CVD2 can include inorganic insulating materials such as silicon nitride and silicon oxide. The thickness of the second inorganic layer CVD2 is less than the thickness of the barrier dam, and it covers the barrier dam and extends at least to the outside of the barrier dam. For example, for the first barrier dam Dam1 and the second barrier dam Dam2, the boundary of the first inorganic layer CVD1 can be located outside the second barrier dam Dam2. Furthermore, the boundary of the second inorganic layer CVD2 can be aligned with the boundary of the first inorganic layer CVD1.

[0104] It should be noted that, in cases where there are two or more obstructions, the terms "outside of the obstruction" and "outside the surrounding area" mentioned in this article, without distinguishing between the obstructions, refer to the side of the outermost obstruction that is furthest from the display area AA; while "inside of the obstruction" and "within the surrounding area" refer to the side of the innermost obstruction that is closest to the display area AA.

[0105] The touch display panel has multiple pixels, each pixel may include multiple sub-pixels with different emitting colors, and each sub-pixel may include a light-emitting diode (LD), and the sub-pixel emits monochromatic light. For example, a pixel may include three sub-pixels, emitting red, green, and blue light respectively. To achieve color display, the sub-pixels can emit different colors using LDs with different emitting colors; that is, each sub-pixel includes one LD, and the emitting color of the LD is the emitting color of its sub-pixel. Alternatively, color display can be achieved by using LDs with the same emitting color in conjunction with a color filter. Specifically, the color filter may include a filter section corresponding to each LD. Each sub-pixel may include one LD and its corresponding filter section. The LDs of different sub-pixels emit the same color, but the colors of the filter sections can be different. Color display is achieved by utilizing the characteristic of the filter section to emit only monochromatic light.

[0106] As shown in Figures 3 and 4, in some embodiments of this disclosure, the touch display panel may further include a touch layer TPS, which may be disposed on the surface of the encapsulation layer TFE away from the driving backplane BP. The touch layer TPS may include a plurality of touch electrodes located in the display area AA for sensing touch operations. Simultaneously, in order to transmit touch signals, the touch display panel may further include a plurality of touch leads TL, each touch lead TL being at least partially located in the peripheral area WA, with one end connected to a touch electrode and the other end connected to the bonding portion BA, for transmitting touch signals.

[0107] Each touch lead TL can extend along a bending trajectory within the area surrounded by the barrier dam, and extend in a straight line along the second direction Y in the area beyond the barrier dam and in the area outside the barrier dam; for example, in some embodiments of this disclosure, the extension direction of the touch lead TL intersects with the extension direction of at least part of the barrier dam; along the extension direction of the touch lead TL, it can be divided into at least a main body segment TLm and a lead-out segment TLf, wherein: the main body segment TLm is at least partially located within the area surrounded by the barrier dam and is connected to the touch electrode; the lead-out segment TLf is at least partially located outside the area surrounded by the barrier dam and is connected to the bonding portion BA.

[0108] In some embodiments of this disclosure, the touch lead TL may be a multi-layer structure, comprising multiple layers of wires spaced apart, with adjacent layers separated by an insulating material. The wires of the same touch lead TL overlap and have the same extension path. The individual wires of the same touch lead TL are connected in parallel through contact holes, thereby reducing impedance by forming a single touch lead TL from multiple wires. For example, as shown in Figures 4 and 5, the touch lead TL includes a first wire TL1 and a second wire TL2 located on the side of the first wire TL1 away from the display substrate PNL, with the first wire TL1 and the second wire TL2 connected.

[0109] As shown in Figure 2, taking the TPS (Touch Layer System) with a mutual capacitance touch structure as an example, the touch electrodes of the TPS may include multiple first touch electrodes Rx and multiple second touch electrodes Tx. Any first touch electrode Rx can extend along a first direction X, and the first touch electrodes Rx can be spaced apart along a second direction Y. Simultaneously, any second touch electrode Tx can extend along the second direction Y, and the second touch electrodes Tx can be spaced apart along the first direction X. Each first touch electrode Rx intersects with each second touch electrode Tx, and each second touch electrode Tx intersects with each first touch electrode Rx, but the intersecting first touch electrodes Rx and second touch electrodes Tx are insulated from each other.

[0110] When implementing touch functionality, a drive signal can be input to the second touch electrode Tx. A capacitance can be generated between the first touch electrode Rx and the second touch electrode Tx. When a touch is made in the touch area TA, the capacitance at the touch position changes. The touch position can be determined by detecting the sensing signal of the first touch electrode Rx. Of course, the first touch electrode Rx and the second touch electrode Tx can be interchanged.

[0111] In some embodiments of this disclosure, as shown in FIG2, each first touch electrode Rx and second touch electrode Tx can be formed by multiple electrode blocks connected in series. Specifically:

[0112] A second touch electrode Tx may include a plurality of second electrode blocks Txc connected in series along a second direction Y. Adjacent second electrode blocks Txc may be connected by a connecting part Txo, which is disposed on the same layer as the second electrode blocks Txc. The outline of the second electrode block Txc may be a rhombus or other polygons, or other shapes.

[0113] A first touch electrode Rx may include a plurality of first electrode blocks Rxc distributed along a first direction X and a transition bridge Rxo connecting two adjacent second electrode blocks Txc. The outline of the first electrode block Rxc may be a rhombus or other polygon, and the shape of the first electrode block Rxc may be the same as that of the second electrode block Txc. The transition bridge Rxo and the first electrode blocks Rxc are located on different layers and can be connected through contact holes. The first electrode blocks Rxc and the second electrode blocks Txc are disposed on the same layer. Because the transition bridge Rxo is located on different layers from the first electrode blocks Rxc and the second electrode blocks Txc, the transition bridge Rxo may intersect with the connecting portion CP in space but not in contact, thus achieving the intersection and insulation of the first touch electrode Rx and the second touch electrode Tx.

[0114] As shown in Figures 1 and 2, each touch electrode can be connected to the bonding part BA via a touch lead TL. Of course, a touch electrode can also be connected to the bonding part BA via two touch leads TL. For example, the two ends of a second touch electrode Tx are connected to two touch leads TL respectively, and are also connected to the bonding part BA.

[0115] As shown in Figures 3-5, in some embodiments of this disclosure, the touch layer TSP may include a barrier layer TBU, a first conductive layer TMA, an insulating isolation layer TLD, a second conductive layer TMB, and a touch protection layer TOC, wherein:

[0116] The barrier layer TBU can be used as the substrate for the touch layer TSP, and its materials may include insulating materials such as silicon nitride, silicon oxide, and silicon oxynitride.

[0117] The first conductive layer TMA can be disposed on the surface of the barrier layer TBU away from the display substrate PNL, and it includes the transition bridge Rxo of the second touch electrode Tx; the first conductive layer TMA can be a single layer or a multi-layer structure. For example, the first conductive layer TMA can include two outer layers and an intermediate layer located between the two outer layers. The material of the outer layer can be titanium, and the material of the intermediate layer can be aluminum, that is, the first conductive layer TMA is a Ti / Al / Ti structure; or, the material of the outer layer can be indium tin oxide (ITO), and the material of the intermediate layer can be aluminum, that is, the first conductive layer TMA is an ITO / Ag / ITO structure.

[0118] The insulating isolation layer TLD covers the first conductive layer TMA. Its material can be silicon nitride, or it can be other inorganic or organic insulating materials such as silicon oxide or silicon oxynitride.

[0119] The second conductive layer TMB may be disposed on the surface of the insulating layer away from the first conductive layer TMA, and the second conductive layer TMB may include the first electrode block Rxc and the second electrode block Txc. The second conductive layer TMB may be a single-layer or multi-layer structure, and if it is a multi-layer structure, the second conductive layer TMB may also be the Ti / Al / Ti structure or the ITO / Ag / ITO structure mentioned above.

[0120] The touch protection layer TOC can cover the second conductive layer TMB, which can be made of transparent insulating materials such as polyimide (PI) or optical adhesive.

[0121] In addition, the first touch electrode Rx and the second touch electrode Tx can both be mesh structures formed by multiple grid lines. The mesh structure has multiple mesh holes, each mesh hole can be surrounded by multiple grid lines, and one mesh hole can overlap with at least one light-emitting device LD so as to transmit light.

[0122] As shown in Figure 5, the first wire TL1 of the above-mentioned touch lead TL can be located in the first conductive layer TMA, and the second wire TL2 can be located in the second conductive TMB layer. The first wire TL1 and the second wire TL2 of the same touch lead TL can be connected through a contact hole that penetrates the insulating isolation layer TLD.

[0123] In other embodiments of this disclosure, the transition bridge Rxo in the above embodiments may also be located in the second conductive layer TMB, and the first electrode block Rxc and the second electrode block Txc may also be located in the first conductive layer TMA.

[0124] The bonding portion BA and the blocking dam are spaced apart, meaning there is a certain distance between them. If there are multiple blocking dams, the distance between the bonding portion BA and the blocking dam is the distance to the outermost blocking dam; for example, the bonding portion BA is located outside the second blocking dam Dam2. In some embodiments, a bending area may be provided between the bonding portion BA and the blocking dam, and the bending area may employ a flexible structure that can be bent. By bending the bending area, the bonding portion BA can be bent to the backlight side of the touch display panel, that is, the side opposite to the light emission direction; thereby, the flexible circuit board and the control circuit board can be connected on the backlight side of the touch display panel. Of course, in other embodiments, a rigid structure, i.e., non-bending, may be used instead of a flexible structure between the blocking dam and the bonding portion BA.

[0125] As shown in Figure 18, in some embodiments of this disclosure, the touch electrode can be a mesh structure with multiple mesh holes TH, and each mesh hole TH is surrounded by multiple channel lines Lc. A sub-pixel P can overlap with a mesh hole TH, and correspondingly, a light-emitting device LD can overlap with a mesh hole TH, so that the light emitted from a sub-pixel P can pass through the touch electrode, reducing light occlusion and improving brightness. Furthermore, in order to reduce occlusion, the boundary of the orthographic projection of a mesh hole TH on the substrate SU can be located outside the orthographic projection of the sub-pixel P overlapping with it on the substrate SU, avoiding the channel lines Lc from occluding the sub-pixel P. The orthographic projection of the aforementioned channel lines Lc on the substrate SU can be located within the orthographic projection of the pixel definition layer PDL on the substrate SU, and outside the orthographic projection of the pixel opening on the substrate SU.

[0126] If different sub-pixels P of the same pixel emit different colors of light from their light-emitting devices (LDs), then sub-pixels P do not need to have a filter. Therefore, the range of sub-pixels P is the range of the light-emitting devices (LDs), and the relationship between sub-pixels P and meshes TH can be represented by the orthographic projection of the pixel opening onto the substrate SU and the orthographic projection of the mesh TH onto the substrate SU. If sub-pixels P include both light-emitting devices (LDs) and filters, then the range of either the filter or the light-emitting devices (LDs) can be used to represent the range of sub-pixels P.

[0127] In some embodiments of this disclosure, each sub-pixel P can be divided into multiple sub-pixel columns, and each sub-pixel column can be divided into a first sub-pixel column P1 and a second sub-pixel column P2 arranged alternately along a first direction X. In the first sub-pixel column P1, there may be a channel line Lc between two adjacent sub-pixels P, and in the second sub-pixel column P2, there are at least two channel lines Lc between two adjacent sub-pixels P.

[0128] Furthermore, in some embodiments, each sub-pixel P may include a first sub-pixel Pr, a second sub-pixel Pg, and a third sub-pixel Pb with different emission colors; the first sub-pixel column P1 includes first sub-pixels Pr and second sub-pixels Pg arranged alternately along the second direction Y; the second sub-pixel column P2 includes a plurality of third sub-pixels Pb arranged along the second direction Y. The orthographic projection of the sub-pixels P in the second sub-pixel column P2 onto the substrate SU is larger than the area of ​​the orthographic projection of the sub-pixels P in the first sub-pixel column P1 onto the substrate SU. For example, the third sub-pixel Pb emits blue light, the second sub-pixel Pg emits green light, the first sub-pixel Pr emits red light, the third sub-pixel Pb is larger than the first sub-pixel Pr and the second sub-pixel Pg, and the first sub-pixel Pr may be larger than the second sub-pixel Pg.

[0129] Furthermore, in some embodiments, the spacing between two adjacent channel lines Lc between two adjacent sub-pixels P in the second sub-pixel column P2 is less than or equal to the width of one channel line Lc, which is beneficial for setting more channel lines Lc and reducing impedance.

[0130] The pattern of the channel line Tc described above is illustrated below:

[0131] As shown in Figure 18, because the touch electrode has a mesh structure, there are at least two channel lines Lc between at least two adjacent light-emitting devices (LDs). That is, there are at least two channel lines Lc projected onto the substrate SU between the orthogonal projections of at least two adjacent light-emitting devices (LDs). This helps to reduce the impedance of the touch electrode without obstructing the light-emitting devices (LDs), which is especially beneficial for medium and large-sized touch display panels, as it reduces the load on the touch electrode and lowers signal attenuation.

[0132] The channel line Lc may include multiple first channel lines Ly, second channel lines Lx1, and third channel lines Lx2, wherein:

[0133] The first channel line Ly can extend along the second direction Y, and each first channel line Ly can be arranged along the first direction X. The second channel line Lx1 can extend along the first direction X, and multiple second channel lines Lx1 distributed along the second direction Y are connected between any two adjacent first channel lines Ly. Each mesh TH is formed by two adjacent first channel lines Ly and two adjacent second channel lines Lx1.

[0134] In the first direction X, any two adjacent second channel lines Lx1 between the nth and n+1th first channel lines Ly define a mesh TH, and the mesh TH between the nth and n+1th first channel lines Ly includes a first mesh THr and a second mesh THg arranged alternately along the second direction Y, the first mesh THr overlapping with the first sub-pixel Pr, and the second mesh THg overlapping with the second sub-pixel Pg.

[0135] The second channel line Lx1 between the (n+1)th and (n+2)th first channel lines Ly can be divided into multiple groups, each group including two adjacent second channel lines Lx1 in the second direction Y; the spacing between the two second channel lines Lx1 in a group can be greater than the spacing between any two adjacent second channel lines Lx1 between the nth and (n+1)th first channel lines Ly. Two adjacent second channel lines Lx1 in a group define a mesh TH, and this mesh TH can overlap with the third sub-pixel Pb, and is a third mesh THb. Simultaneously, a third channel line Lx2 is provided between two adjacent groups, connecting the (n+1)th and (n+2)th first channel lines Ly. There are three channel lines Lc (two second channel lines Lx1 and one third channel line Lx2) between two adjacent third meshes THb, that is, there are three channel lines Lx1 between two adjacent third sub-pixels Pb. Of course, two or more third channel lines Lx2 can also be set between two line groups; n≥2.

[0136] The inventors discovered that the aforementioned touch display panel sometimes experiences touch abnormalities during use, affecting human-computer interaction. After extensive testing and analysis, they found that the cause of the touch abnormalities was that at least some of the touch leads TL experienced short circuits in the area between the blocking dam and the bonding part BA. The inventors further discovered that the cause of the short circuits was the presence of residual conductive material between adjacent touch leads TL in this area. For example, there was conductive material between the second wires TL2 of two adjacent touch leads TL in the second conductive layer TMB, causing adjacent touch leads TL to short circuit.

[0137] Through further analysis and research, the inventors discovered that the reason for the aforementioned conductive material residue is that during the formation of the barrier layer TBU, a mask is required for deposition. However, the mask directly contacts the second inorganic layer CVD2 of the encapsulation layer TFE outside the barrier dam area, making it prone to scratching. This results in pits forming on the surface of the contact area, which in turn causes pits to appear on the corresponding areas of the overlying film layer. For example, after forming the barrier layer TBU, the first conductive layer TMA, and the insulating isolation layer TLD, the aforementioned pits will cause pits to also form on the surface of the insulating isolation layer TLD; in addition, the first wire TLD... 1. The insulating isolation layer TLD is locally raised, resulting in a large step difference between two adjacent first lines TL1. When forming the second line TL2, the second conductive layer TMB needs to be patterned by photolithography. However, during the exposure and development of the photoresist required for photolithography, the photoresist accumulates in the pits between the first lines TL1, with a thickness greater than in other areas. Without increasing the exposure, it is difficult to completely expose the area, resulting in photoresist residue after development. The residual light may make it difficult to completely etch the second conductive layer TMB in this area, thus resulting in residue.

[0138] To address the aforementioned issues, the inventors, based on their analysis, proposed that by modifying the structure of the lead-out segment TLf and adding a support for the supporting mask, the aforementioned residues can be avoided, short circuits can be prevented, and the risk of touch malfunctions can be reduced. The following is an illustrative example of the solution:

[0139] First type of implementation

[0140] As shown in Figures 4-10, the lead-out section TLf of the touch lead TL has a single-layer structure, that is, it only includes one layer of wire, instead of using multiple layers of wire, to prevent short circuits caused by residual conductive material. Depending on the relative positions of the main section TLm and the lead-out section TLf with the barrier, there are at least three implementation methods. For example:

[0141] As shown in Figures 4-6, in the first embodiment of the first type, the blocking dam includes a first blocking dam Dam1 and a second blocking dam Dam2; the touch lead TL includes a first wire TL1 located in the first conductive layer TMA and a second wire TL2 located in the second conductive layer TMB; wherein, the main body segment TLm can be connected to the touch electrode and can extend to the side of the second blocking dam Dam2 away from the first blocking dam Dam1, that is, the outside of the second blocking dam Dam2; the lead-out segment TLf is located outside the second blocking dam Dam2 and is connected to the bonding part BA.

[0142] The main segment TLm may include a first wire TL1 and a second wire TL2, while the lead segment TLf includes only one of the first wire TL1 and the second wire TL2. That is, in the touch lead TL, only one of the first wire TL1 and the second wire TL2 is used to form the lead segment TLf. For example, if the lead segment TLf includes only the first wire TL1 and no second wire TL2, then the insulating layer TLD covers the first wire TL1. Even if the second inorganic layer has pits due to the mask rubbing, and the first wire TL1 increases the step difference, since there is no second wire TL2 on the first wire TL1, there is no problem of short circuit in the second wire TL2 of adjacent lead segments TLf. If the lead segment TLf includes only the second wire TL2 and no first wire TL1, then there is no step difference caused by the first wire TL1, and conductive material is less likely to remain between the second wires TL2 of two adjacent lead segments TLf, thus avoiding the short circuit problem mentioned above.

[0143] Furthermore, if the lead-out segment TLf only includes the first wire TL1, that is, the lead-out segment TLf can be located on the first conductive layer TMA, then the insulating isolation layer TLD can cover the first wire TL1. If the lead-out segment TLf only includes the second wire TL2, that is, the lead-out segment TLf can be located on the second conductive layer TMB, the second wire TL2 extends on the surface of the insulating isolation layer TLD away from the drive backplane BP; of course, the boundary of the insulating isolation layer TLD can be aligned with the end of the first wire TL1 near the bonding portion BA, so that the second wire TL2 can extend to the surface of the barrier layer TBU away from the drive backplane BP.

[0144] Furthermore, adjacent layers of wire in a main body segment TLm can be connected through at least one contact hole Ho, and the main body segment TLm extends to the outside of the second barrier dam Dam2, with at least one contact hole Ho located outside the second barrier dam Dam2; that is, in the area outside the second barrier dam Dam2 where there are multiple layers of wire, they are connected through at least one contact hole Ho. Of course, in the portion of the main body segment TLm located inside the second barrier dam Dam2, two layers of wire can also be connected through contact holes Ho; increasing the number of contact holes Ho helps to further reduce impedance and avoid excessive local resistance.

[0145] The length S of the main segment TLm located in the area of ​​the second barrier dam Dam2 is not less than the length of the contact hole Ho in the extension direction of the main segment TLm; the shape of the outline of the contact hole Ho in the orthographic projection of the display substrate PNL can be rectangular, and the length direction of the rectangle is the extension direction of the main segment TLm, and the width direction of the rectangle is the width direction of the main segment TLm; in order to ensure that the part of the main segment TLm outside the second barrier dam Dam2 is sufficient to open the contact hole Ho, the distance between the lead-out segment TLf and the second barrier dam Dam2 can be such that the main segment TLm extends beyond the second barrier dam Dam2 not less than the length of the contact hole Ho in the extension direction of the touch lead TL, and not more than twice that length, to ensure that the contact hole Ho can be opened normally, and that the main segment TLm is not too long and will still cause a short circuit problem.

[0146] Furthermore, considering the limitations of process precision, the length of the contact hole Ho can be 25μm-35μm, and the width can be 4-6μm. For example, the length of the contact hole Ho is 30μm, and the width is 5μm. Simultaneously, the distance S between the lead-out section TLf and the second barrier Dam Dam2 is not less than 50μm. For example, the distance S between the lead-out section TLf and the second barrier Dam Dam2 is 60μm, and the length of the contact hole Ho is 30μm.

[0147] As shown in Figures 7 and 8, in the second embodiment of the first type, the blocking dam includes a first blocking dam Dam1 and a second blocking dam Dam2; the touch lead TL includes a first line body TL1 located in the first conductive layer TMA and a second line body TL2 located in the second conductive layer TMB; wherein, the main body segment TLm can be connected to the touch electrode, and the lead-out segment TLf is connected to the bonding part BA.

[0148] In a touch lead TL, the main body segment TLm is located within the area surrounded by the first barrier Dam 1, but does not exceed the first barrier Dam 1; the lead-out segment TLf may overlap with the first barrier Dam 1 and the second barrier Dam 2. For example, the boundary where the lead-out segment TLf meets the main body segment TLm is aligned with the boundary of the first barrier Dam 1 near the display area AA. Of course, the lead-out segment TLf may also extend to the inside of the first barrier Dam 1.

[0149] Meanwhile, in this embodiment, the main body segment TLm has a multi-layered wire structure, while the lead-out segment TLf has a single-layered wire structure. The main body segment TLm may include a first wire TL1 and a second wire TL2, while the lead-out segment TLf may include only one of the first wire TL1 and the second wire TL2. For specific details, please refer to the first embodiment of the first type described above, which will be detailed here. Since the main body segment TLm is located within the area surrounded by the first barrier Dam Dam1, and the lead-out segment TLf does not need to be connected to the wire through a contact hole, the touch lead TL outside the second barrier Dam Dam2 is no longer provided with a contact hole.

[0150] As shown in Figures 9 and 10, in the third embodiment of the first type, the blocking dam includes a first blocking dam Dam1 and a second blocking dam Dam2; the touch lead TL includes a first line TL1 located in the first conductive layer TMA and a second line TL2 located in the second conductive layer TMB; wherein, the main body segment TLm can be connected to the touch electrode, and the lead-out segment TLf is connected to the bonding part BA.

[0151] In a touch lead TL, the main body segment TLm is located within the area surrounded by the second barrier Dam Dam2 and may extend beyond the first barrier Dam Dam1; the lead-out segment TLf may overlap with the second barrier Dam Dam2 but not with the first barrier Dam Dam1; for example, the boundary where the lead-out segment TLf connects to the main body segment TLm is between the first barrier Dam Dam1 and the second barrier Dam Dam2.

[0152] In this embodiment, the main body segment TLm has a multi-layered wire structure, and the lead-out segment TLf has a single-layered wire structure. The main body segment TLm may include a first wire TL1 and a second wire TL2, while the lead-out segment TLf may include only one of the first wire TL1 and the second wire TL2. For specific details, please refer to the first and second embodiments of the first type described above, which are detailed here. Since the main body segment TLm is located within the area surrounded by the first blocking dam Dam1, that is, the side of the first blocking dam Dam1 closer to the display area AA, and the lead-out segment TLf does not need to be connected to the wire through a contact hole, the touch lead TL on the outside of the second blocking dam Dam2 (that is, the side of the second blocking dam Dam2 away from the display area AA) is no longer provided with a contact hole.

[0153] It should be noted that in the first type of implementation, only one layer of the touch lead TL is included in both the main body segment TLm and the lead-out segment TLf, while the other layers belong only to the main body segment TLm, that is, the lead-out segment TLf has no other layers. Therefore, when determining the boundary of the docking between the main body segment TLm and the lead-out segment TLf of the touch lead TL, the boundary of the shortest layer of the main body segment TLm that is closest to the binding part BA can be used as the boundary of the docking between the main body segment TLm and the lead-out segment TLf. Of course, the shortest layer is not limited to one.

[0154] Second type of implementation

[0155] As shown in Figures 11-15, both the main body segment TLm and the lead-out segment TLf can adopt a multi-layered wire structure. That is, each layer of wire extends from the main body segment TLm to the lead-out segment TLf. To prevent short circuits caused by residual conductive material, the lower layer of wire can be widened in the lead-out segment TLf. By increasing the coverage area of ​​the lower layer of wire, specifically, within the lead-out segment TLf of the same touch lead TL, the width of the wire closest to the display substrate is greater than the width of other wires. A wider wire can cover the pits, achieving a flattening effect to some extent, narrowing the area with large step differences, and correspondingly narrowing the space where conductive material residue may occur when forming the upper layer of wire, thereby reducing the risk of short circuits. A detailed explanation follows:

[0156] In the lead-out section TLf of the same touch lead TL, the boundary of the orthographic projection of the lead closest to the display substrate PNL on the display substrate PNL is located outside the boundary of the orthographic projection of any other lead on the display substrate PNL. That is, the two sides of the lead closest to the display substrate PNL are located outside the two sides of the lead that overlaps with it, but are spaced apart from adjacent leads in the same layer, i.e., there is a gap between adjacent leads in the same layer to prevent short circuits.

[0157] Furthermore, to ensure that adjacent lines on the same layer do not short-circuit, the line width should have a certain lower limit to achieve the planarization effect mentioned above. Therefore, based on extensive experiments and analysis, the inventors proposed, as shown in Figure 13, that in the lead-out segment TLf of the same touch lead TL, the distance L between the boundary of the orthographic projection of the line closest to the display substrate PNL and the boundary of the orthographic projection of any other line on the display substrate PNL should not be less than 2μm. Within a range of 2μm, due to the coverage of the lines, the flatness of the surface where the upper layer lines are located is improved, which can avoid the appearance of deep pits. After exposure and development, it is less likely to have residual conductive material due to photoresist residue, thereby reducing the range of residual conductive material between two adjacent upper layer lines and improving the short-circuit problem.

[0158] As shown in Figures 11 and 12, in the first embodiment of the second type described above, the blocking dam includes a first blocking dam Dam1 and a second blocking dam Dam2; the touch lead TL includes a first wire TL1 located in the first conductive layer TMA and a second wire TL2 located in the second conductive layer TMB; wherein, the main body segment TLm can be connected to the touch electrode, and the lead-out segment TLf is connected to the bonding part BA. The boundary where the main body segment TLm and the lead-out segment TLf meet can be located outside the second blocking dam Dam2, so as to minimize the range of the widened area of ​​the wire while preventing short circuits.

[0159] As shown in Figure 15, in the second embodiment of the second type described above, the boundary where the main body segment TLm and the lead-out segment TLf meet can overlap with the second barrier dam Dam2. For example, the boundary where the main body segment TLm and the lead-out segment TLf meet can be aligned with the boundary of the second barrier dam Dam2 away from the display area AA, that is, the orthographic projections on the two boundary substrates SU coincide.

[0160] It should be noted that in the second type of implementation, both the main body segment TLm and the lead-out segment TLf are multi-layered wire structures. However, the width of the portion of the lead-out segment TLf that is closest to the display substrate PNL is greater than the width of the portion located in the main body segment TLm. Therefore, when determining the boundaries of the main body segment TLm and the lead-out segment TLf of the touch lead TL, the boundary of the wider portion of the lead-out segment TLf that is closest to the display substrate PNL can be used as the boundary of the lead-out segment TLf.

[0161] Third type of implementation

[0162] As shown in Figures 16 and 17, a support SP can be provided on the outside of the barrier dam to support the mask during the formation of the barrier layer TBU, preventing pitting of the encapsulation layer due to mask abrasion. Specifically, the support SP can be disposed on the surface of the display substrate PNL and located on the side of the peripheral area WA away from the display area AA of the barrier dam. For example, the barrier dam includes a first barrier dam Dam1 and a second barrier dam Dam2, with the support SP located outside the second barrier dam Dam2.

[0163] In some embodiments of this disclosure, as shown in FIG17, the support SP can be disposed in the same layer as the support column PS mentioned above, that is, the two can be formed simultaneously. At the same time, the first inorganic layer CVD1 and the second inorganic layer CVD2 of the encapsulation layer TFE cover the support SP, and the thickness of both is less than the thickness of the support SP. Meanwhile, the sum of the thicknesses of the first inorganic layer CVD1 and the second inorganic layer CVD2 is also less than the thickness of the support SP, so that the first inorganic layer CVD1 and the second inorganic layer CVD2 are raised by the support SP and protrude, and are higher than the area of ​​the first inorganic layer CVD1 and the second inorganic layer CVD2 covering the lead-out segment TLf. When forming the barrier layer TBU, the protruding area of ​​the second inorganic layer CVD2 raised by the support SP can contact the mask, play the role of supporting the mask, and prevent the mask from scratching the second inorganic layer CVD2 corresponding to the lead-out segment TLf.

[0164] Furthermore, each lead-out segment TLf can be distributed at intervals along the first direction X and has a certain distance from the second barrier dam Dam2. The distance between the support body SP and the second barrier dam Dam2 can be equal to the distance between the lead-out segment TLf and the second barrier dam Dam2. In other words, the support body SP can be the same length as the lead-out segment TLf, thereby providing maximum support for the area where a short circuit may occur.

[0165] In some embodiments of the third type, the lead-out segments TLf of each touch lead TL can be spaced apart along the first direction X. The support SP can adopt a strip structure extending along the second direction Y, and the width of the support SP in the first direction X is greater than the width of the lead-out segments TLf, making the support SP less prone to deformation when supporting the mask. At the same time, the length of the support SP in the first direction X and the distance between the second blocking dam Dam2 and the binding part BA maximize the range of the mask support.

[0166] In some embodiments of the third type, the number of supports SP is at least two, and each support SP is distributed along a first direction X; at least a portion of the lead segments TLf of the touch leads TL are located between two supports SP. For example, the lead segments TLf of each touch lead TL can be divided into n line groups, n≥2, each line group includes multiple lead segments TLf distributed at intervals along the first direction X; and each line group is also distributed along the first direction X, but the distance between two adjacent line groups is greater than the distance between two adjacent lead segments TLf in the same line group. The supports SP can be divided into n support groups, and each support group includes two supports SP distributed at intervals along the first direction X; the lead segments TLf of one line group can be located between two supports SP of one support group.

[0167] The third type of implementation described above can be combined with any of the first and second types of implementations described above. That is, regardless of whether the lead-out section TLf adopts a single-layer line or a multi-layer line + bottom line widening scheme, a support SP can be set on the outside of the barrier dam. Of course, it is also possible not to combine with the first and second types of implementations, but to directly add a support SP at the contact of the multi-layer line.

[0168] In some embodiments of this disclosure, the touch layer TSP may further include dummy leads DL, which may be disposed within the area surrounded by the blocking dam and spaced apart from the main body segment TLm in the same layer. For example, if the main body segment TLm is a multi-layer structure including multiple layers of wires, the dummy leads DL may also be a multi-layer structure, and each may be disposed in the same layer as each layer of wires in the main body segment TLm. Simultaneously, the dummy leads DL are floating, meaning they are not connected to any electrical signals, and the cracks in the outer area WA can be blocked through the dummy leads DL.

[0169] As shown in Figure 4, there are multiple dummy leads DL, distributed along the first direction X. A portion of the main body segment TLm of any touch lead TL is located between two adjacent dummy leads DL, thus preventing cracks from extending into the main body segment TLm through the dummy leads DL. Furthermore, each touch lead TL can be divided into two or more groups, each group including multiple touch leads TL, with the main body segment TLm of the same group of touch leads TL located between two adjacent dummy leads DL.

[0170] As shown in Figure 1, in some embodiments of this disclosure, the touch layer TSP further includes a grounded shielding line GNL, which may be located in the peripheral area WA and surround the touch lead TL. The shielding line GNL overlaps with the blocking dam and is connected to the bonding part BA. External signals can be shielded by the shielding line GNL, reducing interference. Furthermore, the width of at least a portion of the area of ​​the shielding line GNL within the range surrounded by the blocking dam can be greater than the width of the touch lead TL, further improving anti-interference performance. The inventors, through experimentation and analysis, propose that the width of at least a portion of the area of ​​the shielding line GNL within the range surrounded by the blocking dam can be not less than 100 μm, which can significantly improve anti-interference performance during touch display.

[0171] This disclosure also provides a display device, which may include the touch display panel of any of the above embodiments. The specific structure and beneficial effects of the touch display panel can be referred to the above embodiments of the touch display panel, and will not be described in detail here. The display device of this disclosure may be an in-vehicle display, or an electronic device with touch display function such as a mobile phone or tablet computer, which will not be listed here.

[0172] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A touch display panel having a display area and a peripheral area located outside the display area; The peripheral area has a bonding portion; the touch display panel includes: The display substrate includes a light-emitting device located in the display area and a barrier dam located in the peripheral area, the barrier dam surrounding the display area, and the bonding portion located outside the barrier dam; An encapsulation layer covers the light-emitting device and includes a first inorganic layer and a second inorganic layer distributed along a direction away from the display substrate, and an organic layer disposed between the first inorganic layer and the second inorganic layer; the first inorganic layer and the second inorganic layer cover the barrier dam and extend to the outside of the barrier dam; the organic layer is located within the area surrounded by the barrier dam; A touch layer is disposed on the surface of the encapsulation layer away from the display substrate; the touch layer includes touch electrodes located in the display area and touch leads located in the peripheral area; the extending direction of the touch leads intersects the extending direction of at least a portion of the blocking dam; the touch leads are at least divided into a main body segment and a lead-out segment along their extending direction, the main body segment is at least partially located within the area surrounded by the blocking dam and connected to the touch electrodes; the lead-out segment is at least partially located outside the area surrounded by the blocking dam and connected to the bonding portion; the touch leads include multiple layers of spaced wires, with adjacent layers of wires overlapping and connected; the main body segment includes each layer of the touch leads; The lead-out section includes only one layer of the line body; or, the lead-out section includes each layer of the line body of the touch lead, and in the lead-out section of the same touch lead, the width of the line body closest to the display substrate is greater than the width of the other line bodies.

2. The touch display panel according to claim 1, wherein, The barrier dam includes a first barrier dam and a second barrier dam surrounding the first barrier dam; The lead-out section is located on the side of the second barrier dam away from the display area.

3. The touch display panel according to claim 2, characterized in that, The main body segment extends to the side of the second barrier away from the display area; two adjacent layers of the main body segment are connected by at least one contact hole, and at least one contact hole is located on the side of the second barrier away from the display area.

4. The touch display panel according to claim 3, wherein, The distance between the lead-out section and the second blocking dam is not less than the length of the contact hole in the extension direction of the touch lead, and not greater than twice the length of the contact hole in the extension direction of the touch lead.

5. The touch display panel according to claim 1, wherein, The barrier dam includes a first barrier dam and a second barrier dam surrounding the first barrier dam; The lead-out section overlaps with the first barrier dam and the second barrier dam.

6. The touch display panel according to claim 1, wherein, The barrier dam includes a first barrier dam and a second barrier dam surrounding the first barrier dam; The lead-out section overlaps with the second barrier dam, but does not overlap with the first barrier dam.

7. The touch display panel according to claim 1, wherein, In the lead-out section of the same touch lead, the boundary of the orthographic projection of the line closest to the display substrate on the display substrate is located outside the orthographic projection of any other line on the display substrate.

8. The touch display panel according to claim 7, wherein, In the lead-out section of the same touch lead, the distance between the boundary of the orthographic projection of the line closest to the display substrate on the display substrate and the boundary of the orthographic projection of any other line on the display substrate is not less than 2 μm.

9. The touch display panel according to claim 1, wherein, The touch display panel also includes: A support body is disposed in the peripheral area; the support body is located on the side of the barrier away from the display area; the encapsulation layer covers the support body and protrudes in the area corresponding to the support body.

10. The touch display panel according to claim 9, wherein, The display substrate further includes a driving backplate and a pixel definition layer. The light-emitting devices and the pixel definition layer are disposed on the same side of the driving backplate, and the pixel definition layer is used to define the range of each of the light-emitting devices. The touch display panel further includes a support pillar, which is disposed on the surface of the pixel definition layer away from the driving backplate; the encapsulation layer covers the pixel definition layer and the support pillar; the support body is disposed on the same layer as the support pillar.

11. The touch display panel according to claim 9, wherein, The lead-out segments are spaced apart along a first direction; the support is a strip structure extending along a second direction, and the width of the support in the first direction is greater than the width of the lead-out segments.

12. The touch display panel according to claim 9, wherein, The number of supports is at least two, and each of the supports is distributed along a first direction; at least a portion of the lead-out segments are located between the two supports.

13. The touch display panel according to claim 9, wherein, The lead-out sections are spaced apart along a first direction; the distance between the support and the barrier is equal to the distance between the lead-out section and the barrier.

14. The touch display panel according to claim 1, wherein, The touch layer also includes floating dummy leads, which are located within the area surrounded by the barrier dam and are spaced apart from the main body section on the same layer.

15. The touch display panel according to claim 14, wherein, The number of dummy leads is multiple, and any one of the main body segments is located between two adjacent dummy leads.

16. The touch display panel according to claim 1, wherein, The touch layer also includes a grounded shielding wire, which is located in the peripheral area and surrounds the touch lead; the shielding wire overlaps with the blocking dam and is connected to the bonding part; The width of at least a portion of the area within the area surrounded by the barrier is greater than the width of the touch lead.

17. The touch display panel according to claim 16, wherein, The width of the shielding line within at least a portion of the area surrounded by the barrier dam is not less than 100 μm.

18. The touch display panel according to any one of claims 1-17, wherein, The touch electrode includes a plurality of first touch electrodes and second touch electrodes. A first touch electrode includes a plurality of first electrode blocks connected in series along a first direction. Each first touch electrode is spaced apart along a second direction. A second touch electrode includes a plurality of second electrode blocks distributed along the second direction and a connecting bridge connecting two adjacent second electrode blocks. Each second touch electrode is spaced apart along the first direction. The connecting bridge intersects with and is insulated from a first touch electrode. The first direction and the second direction intersect. The line body includes a first line body and a second line body distributed along a direction away from the display substrate; the adapter bridge is disposed in the same layer as the first line body; the first electrode block, the second electrode and the second line body are disposed in the same layer.

19. The touch display panel according to claim 18, wherein, The touch layer includes: A barrier layer covering the second inorganic layer; The first conductive layer includes the first wire and the transition bridge; An insulating layer covers the first conductive layer; the thickness of the insulating layer is less than that of the first conductive layer. The second conductive layer is disposed on the surface of the insulating layer away from the first conductive layer, and includes the first electrode block, the second electrode block and the second wire. A touch-sensitive planarization layer covers the second conductive layer.

20. The touch display panel according to claim 1, wherein, The touch electrode is a mesh structure with multiple holes formed by multiple channel lines, and one of the light-emitting devices overlaps with one of the mesh holes; There are at least two channel lines between at least two adjacent light-emitting devices.

21. The touch display panel according to claim 20, wherein, The touch display panel includes a plurality of sub-pixels, and each sub-pixel includes a light-emitting device; each sub-pixel is divided into a first sub-pixel column and a second sub-pixel column arranged alternately along a first direction. There are at least two channel lines between two adjacent sub-pixels in the second sub-pixel column.

22. The touch display panel according to claim 21, wherein, Each of the sub-pixels includes a first sub-pixel, a second sub-pixel, and a third sub-pixel with different emission colors; the first sub-pixel column includes the first sub-pixels and the second sub-pixels arranged alternately along the second direction; the second sub-pixel column includes a plurality of third sub-pixels arranged along the second direction.

23. The touch display panel according to claim 21, wherein, In the second sub-pixel column, the spacing between two adjacent channel lines between two adjacent sub-pixels is not greater than the width of the channel line.

24. A touch display panel having a display area and a peripheral area located outside the display area; The peripheral area has a bonding portion; the touch display panel includes: The display substrate includes a light-emitting device located in the display area and a barrier dam located in the peripheral area, the barrier dam surrounding the display area, and the bonding portion located outside the barrier dam; The encapsulation layer includes a first inorganic layer and a second inorganic layer distributed along a direction away from the display substrate, and an organic layer disposed between the first inorganic layer and the second inorganic layer; the first inorganic layer and the second inorganic layer cover the barrier dam and extend to the outside of the barrier dam; the organic layer is located within the area surrounded by the barrier dam. A support body is disposed on the surface of the display substrate and located in the peripheral area; the support body is located on the side of the barrier dam away from the display area; the encapsulation layer covers the support body and protrudes in the area corresponding to the support body; A touch layer is disposed on the surface of the encapsulation layer away from the display substrate; the touch layer includes touch electrodes located in the display area and touch leads located in the peripheral area; the extending direction of the touch leads intersects the extending direction of at least a portion of the blocking dam; the touch leads connect the touch electrodes and the bonding portion.

25. The touch display panel according to claim 24, wherein, The display substrate further includes a driving backplate and a pixel definition layer. The light-emitting devices and the pixel definition layer are disposed on the same side of the driving backplate, and the pixel definition layer is used to define the range of each of the light-emitting devices. The touch display panel further includes a support pillar, which is disposed on the surface of the pixel definition layer away from the driving backplate; the encapsulation layer covers the pixel definition layer and the support pillar; the support body is disposed on the same layer as the support pillar.

26. A display device comprising a touch display panel as described in any one of claims 1-25.

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