Touch screen panel and display apparatus

Abstract

Disclosed in the present disclosure are a touch screen panel and a display apparatus, which are used for reducing signal attenuation. Provided in the embodiments of the present disclosure is a touch screen panel. The touch screen panel comprises: a display substrate; and a touch-control layer, which is located on a display side of the display substrate and comprises a plurality of touch-control conductive layers, wherein each touch-control conductive layer comprises a metal grid structure formed by interweaving a plurality of metal lines; and the line width h1 of each metal line and the size h2 of the touch screen panel meet: h1>2.5, and 1.5≤h2 / h1≤3.6, the line width h1 of each metal line having a unit of micron, and the size h2 of the touch screen panel having a unit of inch.

Description

Touch display panel and display device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on February 26, 2024, with application number 202410211650.4 and invention name “Touch Display Panel and Display Device,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of display technology, and in particular to a touch display panel and a display device. Background Art

[0004] With the development of active pen technology, more and more touchscreen electronic products, such as mobile phones, laptops, and tablets, are equipped with active pens, which has led to higher requirements for their performance. However, medium and large-sized touchscreens have high RC loading, which leads to severe signal attenuation when using active pens for touch control, affecting touch performance. Summary of the Invention

[0005] Embodiments of the present disclosure provide a touch display panel and a display device to reduce signal attenuation.

[0006] An embodiment of the present disclosure provides a touch display panel, the touch display panel comprising:

[0007] display substrate;

[0008] The touch layer is located on the display side of the display substrate and includes a multi-layer touch conductive layer; the touch conductive layer includes: a metal grid structure formed by interweaving multiple metal wires; the line width h1 of the metal wire and the size h2 of the touch display panel satisfy: h1>2.5, 1.5≤h2 / h1≤3.6, where the unit of the line width h1 of the metal wire is micrometer, and the unit of the size h2 of the touch display panel is inch.

[0009] In some embodiments, the size of the display panel is less than 10 inches, and the width of the metal line is less than or equal to 4 microns.

[0010] In some embodiments, the size of the display panel is greater than or equal to 10 inches, and the width of the metal line is greater than or equal to 5 micrometers and less than or equal to 6.5 micrometers.

[0011] In some embodiments, the multi-layer touch conductive layer includes: a first touch conductive layer and a second touch conductive layer located on a side of the first touch conductive layer facing away from the encapsulation layer; the touch layer further includes: a touch insulating layer located between the first touch conductive layer and the second touch conductive layer;

[0012] The thickness of the first touch conductive layer is greater than or equal to 0.34 micrometers, and the thickness of the second touch conductive layer is greater than or equal to 0.42 micrometers.

[0013] In some embodiments, the touch insulating layer is an inorganic touch insulating layer;

[0014] The thickness of the first touch conductive layer is less than or equal to 0.42 micrometers, the thickness of the inorganic touch insulating layer is greater than or equal to 0.35 micrometers and less than or equal to 0.43 micrometers, and the thickness of the second touch conductive layer is less than or equal to 0.5 micrometers.

[0015] In some embodiments, the touch insulating layer is an organic touch insulating layer;

[0016] The thickness of the first touch conductive layer is less than or equal to 0.72 micrometers, the thickness of the organic touch insulating layer is greater than or equal to 1.4 micrometers and less than or equal to 1.8 micrometers, and the thickness of the second touch conductive layer is less than or equal to 0.72 micrometers.

[0017] In some embodiments, the thickness of the first touch conductive layer is equal to the thickness of the second touch conductive layer.

[0018] In some embodiments, the touch display panel includes a display area and a peripheral area surrounding the display area; the display substrate includes:

[0019] substrate;

[0020] A pixel definition layer is located on one side of the base substrate and includes a plurality of opening areas;

[0021] The encapsulation layer includes at least one organic encapsulation layer on the side of the pixel definition layer facing away from the base substrate; in the display area, the difference between the minimum thickness of the organic encapsulation layer included in the encapsulation layer in the direction perpendicular to the base substrate and the size h2 of the touch display panel is greater than or equal to 1 micron; wherein, in the display area, the minimum thickness of the organic encapsulation layer included in the encapsulation layer in the direction perpendicular to the base substrate is the thickness of the organic encapsulation layer corresponding to the position where the pixel definition layer is located in the direction perpendicular to the base substrate.

[0022] In some embodiments, the touch display panel is larger than 10 inches in size; the encapsulation layer further comprises: a first inorganic encapsulation layer; and a second inorganic encapsulation layer located on a side of the first inorganic encapsulation layer facing away from the base substrate; and the at least one organic encapsulation layer comprises: a first organic encapsulation layer located between the first inorganic encapsulation layer and the second inorganic encapsulation layer;

[0023] In the display area, a minimum thickness h3 of the first organic encapsulation layer in a direction perpendicular to the base substrate is greater than or equal to 14 micrometers and less than or equal to 18 micrometers.

[0024] In some embodiments, in the display area, a difference between a minimum thickness h3 of the first organic encapsulation layer in a direction perpendicular to the base substrate and a size h2 of the touch display panel is equal to 1 micron.

[0025] In some embodiments, the encapsulation layer also includes: a first inorganic encapsulation layer, and a second inorganic encapsulation layer located on the side of the first inorganic encapsulation layer facing away from the substrate; at least one organic encapsulation layer includes: a first organic encapsulation layer located between the first inorganic encapsulation layer and the second inorganic encapsulation layer, and a second organic encapsulation layer located on the side of the second inorganic encapsulation layer facing away from the first organic encapsulation layer.

[0026] In some embodiments, a minimum thickness of the second organic encapsulation layer in the display area is less than a minimum thickness of the first organic encapsulation layer in the display area.

[0027] In some embodiments, the size of the touch display panel is greater than 10 inches; the minimum thickness of the first organic encapsulation layer in the display area is greater than or equal to 12 microns and less than or equal to 18 microns, and the minimum thickness of the second organic encapsulation layer in the display area is greater than or equal to 8 microns and less than or equal to 14 microns.

[0028] An embodiment of the present disclosure provides a touch display panel, comprising a display area and a peripheral area surrounding the display area; the touch display panel comprises:

[0029] The display substrate comprises: a base substrate, a pixel definition layer and an encapsulation layer located on one side of the base substrate; the pixel definition layer comprises a plurality of opening areas, and the encapsulation layer comprises at least one organic encapsulation layer on a side of the pixel definition layer facing away from the base substrate; in the display area, the difference between the minimum thickness of the organic encapsulation layer included in the encapsulation layer in a direction perpendicular to the base substrate and the dimension h2 of the touch display panel is greater than or equal to 1 micron; wherein, in the display area, the minimum thickness of the organic encapsulation layer included in the encapsulation layer in a direction perpendicular to the base substrate is the thickness of the organic encapsulation layer corresponding to the position where the pixel definition layer is located in the direction perpendicular to the base substrate;

[0030] The touch layer is located on the display side of the display substrate.

[0031] In some embodiments, the touch display panel is larger than 10 inches in size; the encapsulation layer further comprises: a first inorganic encapsulation layer; and a second inorganic encapsulation layer located on a side of the first inorganic encapsulation layer facing away from the base substrate; and the at least one organic encapsulation layer comprises: a first organic encapsulation layer located between the first inorganic encapsulation layer and the second inorganic encapsulation layer;

[0032] In the display area, a minimum thickness h3 of the first organic encapsulation layer in a direction perpendicular to the base substrate is greater than or equal to 14 micrometers and less than or equal to 18 micrometers.

[0033] In some embodiments, in the display area, a difference between a minimum thickness h3 of the first organic encapsulation layer in a direction perpendicular to the base substrate and a size h2 of the touch display panel is equal to 1 micron.

[0034] In some embodiments, the encapsulation layer also includes: a first inorganic encapsulation layer, and a second inorganic encapsulation layer located on the side of the first inorganic encapsulation layer facing away from the substrate; at least one organic encapsulation layer includes: a first organic encapsulation layer located between the first inorganic encapsulation layer and the second inorganic encapsulation layer, and a second organic encapsulation layer located on the side of the second inorganic encapsulation layer facing away from the first organic encapsulation layer.

[0035] In some embodiments, a minimum thickness of the second organic encapsulation layer in the display area is less than a minimum thickness of the first organic encapsulation layer in the display area.

[0036] In some embodiments, the size of the touch display panel is greater than 10 inches; the minimum thickness of the first organic encapsulation layer in the display area is greater than or equal to 12 microns and less than or equal to 18 microns, and the minimum thickness of the second organic encapsulation layer in the display area is greater than or equal to 8 microns and less than or equal to 14 microns.

[0037] An embodiment of the present disclosure provides a display device, which includes the touch display panel provided by the embodiment of the present disclosure.

[0038] In the touch display panel and display device provided by the embodiments of the present disclosure, when h1>2.5, the line width h1 of the metal line included in the touch layer and the size h2 of the touch display panel satisfy: 1.5≤h2 / h1≤3.6. The larger the size h2 of the touch display panel, the larger the line width h1 of the metal line. Thus, as the size of the touch display panel increases, the resistance of the touch conductive layer is reduced by correspondingly increasing the line width of the metal line, thereby reducing the RC loading. When an active stylus is used for touch control, signal attenuation can be reduced, thereby improving the signal-to-noise ratio, hovering touch, linearity, and accuracy of the active stylus. In addition, h2 / h1≤3.6 avoids the situation where h2 / h1 exceeds 3.6 and the increase in line width cannot meet the RC loading required by the size of the touch display panel. 1.5≤h2 / h1 can prevent the metal line from being too wide and blocking the opening area of ​​the display substrate, thereby avoiding affecting the light output rate of the touch display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] FIG1 is a schematic diagram of a touch control principle using an active stylus provided in an embodiment of the present disclosure;

[0041] FIG2 is a schematic structural diagram of a touch display panel provided by an embodiment of the present disclosure;

[0042] FIG3 is a cross-sectional view along CC' in FIG2 provided by an embodiment of the present disclosure;

[0043] FIG4 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0044] FIG5 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0045] FIG6 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0046] FIG7 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0047] FIG8 is a cross-sectional view along line EE' in FIG2 provided by an embodiment of the present disclosure;

[0048] FIG9 is a cross-sectional view along line FF′ in FIG2 provided by an embodiment of the present disclosure;

[0049] FIG10 is another cross-sectional view along line EE' in FIG2 provided by an embodiment of the present disclosure;

[0050] FIG11 is another cross-sectional view along line FF′ in FIG2 provided by an embodiment of the present disclosure;

[0051] FIG12 is a display noise model provided by an embodiment of the present disclosure;

[0052] FIG13 is a waveform diagram of a cathode and data signal provided by an embodiment of the present disclosure;

[0053] FIG14 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0054] FIG15 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0055] FIG16 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0056] FIG17 is a schematic diagram of using an active stylus to perform touch control on a touch display panel according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. And in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0058] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0059] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual scale and are only for the purpose of illustrating the present disclosure. The same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions.

[0060] In related technology, the principle diagram of using an active stylus for touch control is shown in Figure 1. The active stylus transmits signal through the coupling capacitance between the stylus and the touchscreen's Tx and Rx electrodes, passing through the touchscreen's RC loading before reaching the driver chip's (IC) operational amplifier for output. Because products using Flexible Multi-Layer On-Cell (FMLOC) technology integrate the Tx and Rx electrodes above the display packaging layer, as the screen size increases, the resistance and capacitance of the Tx and Rx electrode channels also increase. This increases the impedance of the Tx and Rx electrodes, and the RC loading increases, leading to increased signal attenuation from the active stylus. This severely hinders the application of active styluses in medium- and large-sized touchscreen products.

[0061] In view of this, an embodiment of the present disclosure provides a touch display panel, as shown in FIG2 , FIG3 , and FIG4 , the touch display panel includes:

[0062] Display substrate 1;

[0063] The touch layer 2 is located on the display side of the display substrate 1 and includes a multi-layer touch conductive layer 201. The touch conductive layer 201 includes: a metal grid structure 7 formed by interweaving multiple metal wires 2011; the line width h1 of the metal wires 2011 and the size h2 of the touch display panel satisfy the following conditions: h1>2.5, 1.5≤h2 / h1≤3.6, wherein the unit of the line width h1 of the metal wires 2011 is micrometers, and the unit of the size h2 of the touch display panel is inches.

[0064] The touch display panel provided by the embodiments of the present disclosure can be applied to touch products that use an active stylus for touch control.

[0065] In the touch display panel provided by the embodiment of the present disclosure, when h1>2.5, the line width h1 of the metal line included in the touch layer and the size h2 of the touch display panel satisfy: 1.5≤h2 / h1≤3.6. The larger the size h2 of the touch display panel, the larger the line width h1 of the metal line. Thus, as the size of the touch display panel increases, the resistance of the touch conductive layer is reduced by correspondingly increasing the line width of the metal line, thereby reducing the RC loading. When an active stylus is used for touch control, signal attenuation can be reduced, thereby improving the signal-to-noise ratio, hovering touch, linearity, and accuracy of the active stylus. In addition, h2 / h1≤3.6 avoids the situation where h2 / h1 exceeds 3.6 and the increase in line width cannot meet the RC loading required by the size of the touch display panel. 1.5≤h2 / h1 can prevent the metal line from being too wide and blocking the opening area of ​​the display substrate, thereby avoiding affecting the light output rate of the touch display panel.

[0066] It should be noted that for a rectangular or approximately rectangular touch display panel, as shown in FIG4 , the touch display panel size h2 refers to the length of the diagonal of the rectangle. For a circular or other special-shaped touch display panel, taking a circular shape as an example, as shown in FIG5 , the touch display panel size h2 refers to the length of the diagonal of the smallest rectangle within which the touch display panel can fit.

[0067] It should be noted that FIG3 is a cross-sectional view along CC' in FIG2 .

[0068] In some embodiments, in the display area AA, the multi-layer touch conductive layer includes a plurality of touch electrodes. As shown in FIG4 , the plurality of touch electrodes include a plurality of first touch electrodes 5 and a plurality of second touch electrodes 6 .

[0069] The plurality of first touch electrodes 5 are arranged along the first direction X and extend along the second direction Y. The first touch electrode 201 includes a plurality of first sub-electrodes 501 arranged along the second direction Y and a bridge electrode 502 electrically connecting two adjacent first sub-electrodes 501 .

[0070] The plurality of second touch electrodes 6 extend along the first direction X and are arranged along the second direction Y. The second touch electrodes 6 include a plurality of second sub-electrodes 601 arranged along the first direction X.

[0071] In some embodiments, as shown in FIG8 to FIG11 , the multi-layer touch conductive layer 201 includes: a first touch conductive layer 201 - 1 and a second touch conductive layer 201 - 2 located on a side of the first touch conductive layer 201 - 1 away from the display substrate 1 ;

[0072] The touch layer 2 further includes: a touch insulating layer 202 located between the first touch conductive layer 201 - 1 and the second touch conductive layer 201 - 2 ;

[0073] The first sub-electrode 501 and the second sub-electrode 601 are located in one touch conductive layer 201 , and the bridge electrode 502 is located in the other touch conductive layer 201 . The bridge electrode 502 is electrically connected to the first sub-electrode 501 through a first via 3 penetrating the touch insulating layer 202 .

[0074] It should be noted that Figure 8 is a cross-sectional view along EE' in Figure 2, Figure 9 is a cross-sectional view along FF' in Figure 2, Figure 10 is another cross-sectional view along EE' in Figure 2, and Figure 11 is another cross-sectional view along FF' in Figure 2. Figures 8 to 11 are exemplified by the example in which the first sub-electrode 501 and the second sub-electrode 601 are located in the second touch conductive layer 201-2 and the bridging electrode 502 is located in the first touch conductive layer 201-1.

[0075] In some embodiments, as shown in FIG2 , the metal mesh structure 7 is formed by interweaving a plurality of metal wires 2011 so that the metal mesh structure 7 includes a plurality of meshes 701, that is, the mesh 701 is a polygon formed by a plurality of metal wires, or in other words, the metal mesh structure 7 is formed by repeatedly and continuously setting up meshes 701. As shown in FIG2 , the shape of the mesh 701 surrounded by the metal wires 2011 is a rectangle. Alternatively, the shape of the mesh surrounded by the metal wires can be a rhombus, a triangle, a hexagon, etc., or the shape of the mesh surrounded by the metal wires can be a combination of multiple shapes, such as a combination of a pentagon and a hexagon, or the shape of the mesh surrounded by the metal wires can include any one or more of a triangle, a square, a rectangle, a rhombus, a trapezoid, a pentagon, and a hexagon. In a specific implementation, the mesh pattern surrounded by the metal wires can be a regular shape or an irregular shape, and the edges of the mesh can be straight lines or curves, which are not limited in the embodiments of the present disclosure. The edge of the metal mesh structure can also include an incomplete mesh pattern.

[0076] In a specific implementation, as shown in FIG2 , a plurality of cutouts 4 may be provided on the grid 701. For portions located on the same touch conductive layer 201 and requiring mutual insulation, for example, when the grid 701 of the first sub-electrode 501 and the grid 701 of the second sub-electrode 6011 are located on the same layer, the cutouts 4 may be provided on the entire surface of the grid 701 pattern to achieve isolation between the grid 701 of the first sub-electrode 501 and the grid 701 of the second sub-electrode 6011.

[0077] The touch electrodes provided in the embodiments of the present disclosure include a metal mesh structure. The first touch electrodes and the second touch electrodes in the metal mesh structure have advantages such as low resistance, small thickness, and fast response speed, which can improve the sensitivity and accuracy of touch recognition.

[0078] In a specific implementation, the grids in the first touch conductive layer and the grids in the second touch conductive layer have the same shape, size, and metal line width, and the grids in the first touch conductive layer and the grids in the second touch conductive layer have roughly overlapping areas in their orthographic projections on the display substrate.

[0079] In some embodiments, the display area AA includes multiple sub-pixels; as shown in Figure 3, the display substrate 1 specifically includes: a base substrate 101, a pixel definition layer 105 and multiple light-emitting devices 104 located on one side of the base substrate 101, a driving circuit layer 103 located between the light-emitting devices 104 and the base substrate 101, and an encapsulation layer 102 located on the side of the pixel definition layer 105 and the light-emitting devices 104 away from the base substrate; wherein the light-emitting devices 104 correspond one-to-one to the sub-pixels.

[0080] In some embodiments, as shown in Figure 3, the light-emitting device 104 includes an anode 1041, a light-emitting functional layer 1042, and a cathode 1043 that are stacked. The pixel definition layer 105 includes a plurality of opening areas 1051. The opening areas 1051 correspond one-to-one to sub-pixels. The pixel definition layer 105 covers the edge of the anode 1041. The orthographic projection of the opening area 1051 on the substrate 101 falls within the orthographic projection of the anode 1041 on the substrate 101. The light-emitting functional layer 1042 is located on the side of the anode 1041 and the pixel definition layer 105 that are away from the substrate 101. The cathode 1043 is located on the side of the light-emitting functional layer 1042 that is away from the substrate 101.

[0081] In a specific implementation, if the light-emitting device is an organic light-emitting diode, the light-emitting functional layer includes at least an organic light-emitting layer, and may also include at least one of the following: an electron injection layer, a hole blocking layer, an electron transport layer, a hole transport layer, an electron blocking layer, and a hole injection layer.

[0082] In some embodiments, as shown in FIG3 , the driver circuit layer 103 includes a pixel driver circuit that corresponds one-to-one with the light-emitting device 104 and drives the light-emitting device 104 to emit light. The pixel driver circuit includes, for example, a thin-film transistor 1031 and a capacitor 1032. It should be noted that FIG3 only shows one thin-film transistor 1031 and one capacitor 1032. In specific implementations, the pixel driver circuit may also include a larger number of thin-film transistors and capacitors.

[0083] It should be noted that FIG3 illustrates a top-gate thin-film transistor 1031, where the gate G is located on the side of the active layer 10311 facing away from the base substrate 101. A first electrode 10321 of the capacitor 1032 is provided on the same layer as the gate G, and a second electrode 10322 of the capacitor 1032 is located between the film layer where the gate G is located and the film layer where the source S and drain D are located. The display substrate 1 further includes: a first buffer layer 1033 located between the base substrate 101 and the active layer 10311; a first gate insulating layer 1034 located between the gate G and the active layer 10311; a second gate insulating layer 1035 located between the first electrode 10321 and the second electrode 10322; and an interlayer insulating layer 1036 located between the second electrode 10322 and the source S and drain D. Furthermore, a first planarization layer 106 is located between the source S and drain D and the anode 1041.

[0084] In some embodiments, the anode is connected to the drain through a via hole penetrating the first planarization layer.

[0085] Alternatively, in some embodiments, as shown in FIG3 , the display substrate 1 further includes a switching electrode 1039 located between the source electrode S, the drain electrode D, and the anode 1041, a passivation layer 1037 located between the source electrode S, the drain electrode D, and the switching electrode 1039, and a second planarization layer 1038 located between the passivation layer 1037 and the switching electrode 1039. The anode 1041 is connected to the switching electrode 1039 via a via hole penetrating the first planarization layer 106, and the switching electrode 1039 is connected to the drain electrode D via a via hole penetrating the second planarization layer 1038 and the passivation layer 1037.

[0086] In some embodiments, as shown in FIG2 , the orthographic projection of the opening 1051 on the substrate falls within the orthographic projection of the grid 701 on the substrate 101. That is, the orthographic projection of the metal line 2011 on the substrate does not overlap with the orthographic projection of the opening 1051 on the substrate. This prevents the metal line 2011 from affecting the normal display of the display substrate.

[0087] In some embodiments, as shown in FIG3 , the touch layer 2 further includes: a second buffer layer 203 located between the first touch conductive layer (not shown) and the encapsulation layer 102 , and a protective layer 204 located on a side of the second touch conductive layer 201 - 2 facing away from the base substrate 101 .

[0088] The touch display panel provided in the embodiment of the present disclosure adopts the FMLOC process, that is, the touch layer is directly manufactured on the stacked light-emitting structure layer and the packaging layer, which can reduce the thickness of the touch display panel and is conducive to realizing the lightweight and thin touch display product.

[0089] In some embodiments, as shown in FIG6 , the touch layer further includes a plurality of touch traces 8 ; the plurality of touch traces 8 include: a plurality of first touch traces 801 and a plurality of second touch traces 802 ; the touch display panel further includes a plurality of binding electrodes 9 ;

[0090] The touch trace 8 extends from one end of the first touch electrode 5 or the second touch electrode 6 through the peripheral area NA and is electrically connected to the binding electrode 9 .

[0091] In some embodiments, the touch traces also include a metal grid structure formed by interweaving metal wires.

[0092] In some embodiments, the touch traces are located on at least one touch conductive layer.

[0093] In some embodiments, the touch traces are located in the first touch conductive layer or the second touch conductive layer.

[0094] Alternatively, in some embodiments, as shown in FIG7 , the touch trace 8 includes a first sub-trace 8-1 located in the first touch conductive layer 201-1 and a second sub-trace 8-2 located in the second touch conductive layer 201-2. The second sub-trace 8-2 is electrically connected to the first sub-trace 8-1 via a via penetrating the touch insulating layer 202. This means that the touch traces are arranged in two layers. By connecting the first and second sub-trace in parallel, the impedance of the touch traces can be reduced.

[0095] In some embodiments, the size of the touch display panel is less than 10 inches, and the width of the metal line is less than or equal to 4 micrometers (μm).

[0096] In some embodiments, the size of the touch display panel is greater than or equal to 10 inches, and the width of the metal line is greater than or equal to 5 μm and less than or equal to 6.5 μm.

[0097] Next, we'll illustrate how increasing the metal line width can reduce RC loading. In related art, the metal line width in medium- to large-sized touch display panels (i.e., touch display panels greater than or equal to 10 inches) typically ranges from 2.5μm to 4.5μm. As shown in Table 1, increasing the metal line width from 4μm to 6μm increases the capacitance of the touch electrode by only 4.46%, while reducing the resistance by 34.61%. This significantly reduces touch signal attenuation in medium- to large-sized touch display panels when an active stylus is used for touch control.

[0098] Table 1

[0099] In some embodiments, the thickness of the first touch conductive layer is greater than or equal to 0.34 μm, and the thickness of the second touch conductive layer is greater than or equal to 0.42 μm.

[0100] It should be noted that in conventional small-sized touch display panels, the thickness of the first touch conductive layer is approximately 0.25 μm, and the thickness of the second touch conductive layer is approximately 0.41 μm. However, when the size of the touch display panel increases, if the thickness of the touch conductive layer remains unchanged, the RC loading will be several times that of the small-sized touch display panel, resulting in significant attenuation of the active stylus signal. In the touch display panel provided in the embodiments of the present disclosure, the thickness of the first touch conductive layer is greater than or equal to 0.34 μm, and the thickness of the second touch conductive layer is greater than or equal to 0.42 μm. This is equivalent to increasing the thickness of the touch conductive layer, which can reduce the capacitance of the touch conductive layer, thereby reducing RC loading and reducing active stylus signal attenuation.

[0101] In some embodiments, as shown in Figures 8 and 9, the touch insulation layer 202 is an inorganic touch insulation layer 202-2; the thickness of the first touch conductive layer 201-1 is less than or equal to 0.42 μm, the thickness of the inorganic touch insulation layer 202-2 is greater than or equal to 0.35 μm and less than or equal to 0.43 μm, and the thickness of the second touch conductive layer 201-2 is less than or equal to 0.5 μm.

[0102] That is, when the touch insulating layer 202 is an inorganic touch insulating layer 202-2, the thickness of the first touch conductive layer 201-1 is greater than or equal to 0.34 μm and less than or equal to 0.42 μm, and the thickness of the second touch conductive layer 201-2 is greater than or equal to 0.42 μm and less than or equal to 0.72 μm.

[0103] It should be noted that, as shown in Figures 8 and 9, the side surfaces of the pattern of the first touch conductive layer 201-1 are inclined, meaning that the pattern of the first touch conductive layer 201-1 has a slope angle. In related art, the thickness of the touch insulating layer is approximately 0.33 μm. However, due to the increased thickness of the first touch conductive layer, if the touch insulating layer is too thin, a short circuit between the two touch conductive layers may occur at the slope angle.

[0104] In the touch display panel provided by the embodiment of the present disclosure, the thickness of the inorganic touch insulating layer is greater than or equal to 0.35 μm, that is, the thickness of the touch conductive layer is increased while the thickness of the touch insulating layer is increased accordingly, to avoid the touch insulating layer being unable to cover the slope angle of the touch conductive layer. In addition, since the surface of the inorganic material facing away from the substrate after being deposited on the metal pattern is not a flat surface, the formed inorganic insulating layer also has a slope angle at the slope angle of the metal line. If the thickness of the first touch conductive layer is too thick, the slope angle will be too large, making it difficult for the inorganic material to climb, and two touch conductive layers will still short-circuit. In the embodiment of the present disclosure, the thickness of the first touch conductive layer is less than or equal to 0.42 μm, which can avoid the short circuit caused by the difficulty of the inorganic insulating layer climbing due to the thickness of the first touch conductive layer being too thick. The yield rate of the touch display panel can be improved.

[0105] Alternatively, in some embodiments, as shown in Figures 10 and 11, the touch insulation layer 202 is an organic touch insulation layer 202-2; the thickness of the first touch conductive layer 201-1 is less than or equal to 0.72 μm, the thickness of the organic touch insulation layer 202-2 is greater than or equal to 1.4 microns and less than or equal to 1.8 μm, and the thickness of the second touch conductive layer 201-2 is less than or equal to 0.72 μm.

[0106] That is, when the touch insulating layer 202 is an organic touch insulating layer 202-2, the thickness of the first touch conductive layer 201-1 is greater than or equal to 0.34 μm and less than or equal to 0.72 μm, and the thickness of the second touch conductive layer 201-2 is greater than or equal to 0.42 μm and less than or equal to 0.72 μm.

[0107] In the touch display panel provided by the embodiment of the present disclosure, the thickness of the organic touch insulating layer is greater than or equal to 1.4 μm. That is, when the thickness of the touch conductive layer is increased, the thickness of the touch insulating layer is increased accordingly to prevent the touch insulating layer from failing to cover the slope angle of the touch conductive layer, thereby preventing the first touch conductive layer and the second touch conductive layer from short-circuiting at the slope angle. The thickness of the organic touch insulating layer is less than or equal to 1.8 μm to prevent the film layer from being too thick and affecting the coupling between the touch electrodes. In addition, after the organic material is coated on the metal pattern, the surface facing away from the base substrate is a flattened surface. The formed organic insulating layer is also a flattened surface above the slope angle of the metal line. Therefore, the thickness of the first touch conductive layer is relatively large and the line will not break at the slope angle. Compared with the case where the inorganic touch insulating layer covers the first touch conductive layer, the thickness of the first touch conductive layer can be further increased, reducing RC loading and reducing the attenuation of the active stylus signal.

[0108] In some embodiments, the thickness of the first touch conductive layer is equal to the thickness of the second touch conductive layer.

[0109] In a specific implementation, when the size of the touch display panel is greater than 10 inches and less than 15 inches, an inorganic touch insulating layer may be selected. When the size of the touch display panel is greater than or equal to 15 inches, an organic insulating layer may be selected.

[0110] In some embodiments, the touch conductive layer is a stack of titanium / aluminum / titanium. The thickness of the titanium layer is greater than or equal to 0.02 μm and less than or equal to 0.05 μm. When the touch insulating layer is an inorganic touch insulating layer, in the first touch conductive layer, the thickness of the aluminum layer is greater than or equal to 0.29 μm and less than or equal to 0.4 μm, and in the second touch conductive layer, the thickness of the aluminum layer is greater than or equal to 0.37 μm and less than or equal to 0.48 μm. When the touch insulating layer is an organic touch insulating layer, in the touch conductive layer, the thickness of the aluminum layer is greater than or equal to 0.29 μm and less than or equal to 0.7 μm, and in the second touch conductive layer, the thickness of the aluminum layer is greater than or equal to 0.37 μm and less than or equal to 0.7 μm.

[0111] Next, an example is given to illustrate that increasing the thickness of the touch conductive layer can reduce the active stylus signal attenuation. In the related art, when the thickness of the first touch conductive layer and the thickness of the second touch conductive layer are 0.25μm and 0.41μm respectively, the signal attenuation of the active stylus at 1.8 MHz is 30.3%, and the touch performance of the stylus cannot be guaranteed when the display is large. As shown in Table 2, when the thickness of the first touch conductive layer increases to 0.38μm and the thickness of the second touch conductive layer increases to 0.46μm, the signal attenuation of the active stylus at 1.8MHz is reduced to 12.73%. When the thickness of the first touch conductive layer and the thickness of the second touch conductive layer increase to 0.68μm, the signal attenuation of the active stylus at 1.8MHz is reduced to 4.8%, which can significantly reduce the attenuation of the touch signal.

[0112] Table 2

[0113] It should be noted that as product size increases, in addition to increasing RC loading and signal attenuation, as shown in Figures 12 and 13, the display signal da is coupled to the cathode, generating display noise. As product size increases, the intensity of the noise from the display signal da coupling to the cathode increases, and the coupling capacitance between the touch electrode and the cathode also increases, leading to higher noise levels in medium and large-sized touch display products. Furthermore, the touch display panel provided by the embodiments of the present disclosure can also be used for touch control using touch gloves.

[0114] In some embodiments, for an in-vehicle touch display product, as shown in FIG14 , a polarizer (POL), an optically clear adhesive (OCA), and a cover glass (CG) need to be stacked on the touch screen panel (TSP). The thickness of the POL is 191 μm, the OCA is 250 μm, and the CG is 1.3 mm. That is, the thickness of the light-transmitting film layer stacked on the TSP is relatively thick. When the touch glove Gl is used for touch, the distance between the finger Fi and the touch glove Gl and the TSP is relatively large, and problems such as ghost points and no point reporting may occur due to the signal-to-noise ratio (SNR) not meeting the standard.

[0115] In some embodiments, as shown in FIG3 , the encapsulation layer 102 includes at least one organic encapsulation layer 1023 on a side of the pixel definition layer 105 facing away from the base substrate 101 ;

[0116] In the display area, the difference between the minimum thickness of the organic encapsulation layer 1023 included in the encapsulation layer 102 in the direction perpendicular to the base substrate 101 and the size h2 of the touch display panel is greater than or equal to 1 micron; wherein, in the display area, the minimum thickness of the organic encapsulation layer 1023 included in the encapsulation layer 102 in the direction perpendicular to the base substrate 101 is the thickness of the organic encapsulation layer 1023 corresponding to the position where the pixel definition layer 105 is located in the direction perpendicular to the base substrate 101.

[0117] In the touch display panel provided by the disclosed embodiments, the difference between the minimum thickness of the organic encapsulation layer in the display area in a direction perpendicular to the base substrate and the size h2 of the touch display panel is greater than or equal to 1 micron. This allows the thickness of the organic encapsulation layer to be adjusted according to the size of the touch display panel. As the size of the touch display panel increases, the thickness of the organic encapsulation layer also increases, thereby increasing the distance between the touch conductive layer and the cathode, reducing the coupling capacitance between the touch electrode and the cathode, reducing noise, improving the signal-to-noise ratio, and enhancing touch accuracy. This avoids problems such as ghost points and non-point reporting caused by touch using an active stylus or touch gloves.

[0118] In some embodiments, as shown in FIG. 3 , the encapsulation layer 102 includes an organic encapsulation layer 1023 .

[0119] In some embodiments, as shown in Figure 3, the encapsulation layer 102 also includes: a first inorganic encapsulation layer 1021, and a second inorganic encapsulation layer 1022 located on the side of the first inorganic encapsulation layer 1021 away from the base substrate 101; at least one layer of organic encapsulation layer 1023 includes: a first organic encapsulation layer 1023-1 located between the first inorganic encapsulation layer 1021 and the second inorganic encapsulation layer 1022.

[0120] In some embodiments, in the display area, a difference between a minimum thickness h3 of the first organic encapsulation layer 1023 - 1 in a direction perpendicular to the base substrate 101 and a size h2 of the touch display panel is equal to 1 micrometer.

[0121] In the touch display panel provided by the disclosed embodiment, the difference between the minimum thickness of a single first organic encapsulation layer in a direction perpendicular to the base substrate and the size h2 of the touch display panel is equal to 1 micron. This allows the thickness of the first organic encapsulation layer to be adjusted according to the size of the touch display panel. As the size of the touch display panel increases, the thickness of the organic encapsulation layer also increases, thereby increasing the distance between the touch conductive layer and the cathode, reducing the coupling capacitance between the touch electrode and the cathode, reducing noise, improving the signal-to-noise ratio, and enhancing touch accuracy. This avoids problems such as ghost points and non-point reporting when using an active stylus or touch gloves for touch control.

[0122] In some embodiments, the size of the touch display panel is greater than 10 inches. In the display area AA, the minimum thickness h3 of the first organic encapsulation layer 1023 - 1 in a direction perpendicular to the base substrate 101 is greater than or equal to 14 microns and less than or equal to 18 microns.

[0123] In some embodiments, in the peripheral area, as shown in Figure 7, the touch display panel also includes a plurality of retaining walls 10, and the retaining walls 10 are projected on the base substrate 101 to surround the display area (not shown); the plurality of retaining walls 10 include: a first retaining wall 1001, and a second retaining wall 1002 located on the side of the first retaining wall 1001 away from the display area (not shown).

[0124] In some embodiments, the first organic encapsulation layer does not exceed the first barrier wall 1001 .

[0125] In the touch display panel provided by the embodiment of the present disclosure, when the size of the touch display panel is greater than 10 inches, the minimum thickness of the single-layer first organic encapsulation layer in a direction perpendicular to the base substrate is greater than or equal to 14 microns, which is beneficial for increasing the distance between the touch conductive layer and the cathode. The minimum thickness of the single-layer first organic encapsulation layer in a direction perpendicular to the base substrate is less than or equal to 18 microns, which can prevent the organic encapsulation layer from crossing the first barrier wall and reduce the process difficulty.

[0126] Alternatively, in some embodiments, as shown in Figures 15 and 16, the encapsulation layer 102 also includes: a first inorganic encapsulation layer 1021, and a second inorganic encapsulation layer 1022 located on the side of the first inorganic encapsulation layer 1021 away from the base substrate 101; at least one organic encapsulation layer 1023 includes: a first organic encapsulation layer 1023-1 located between the first inorganic encapsulation layer 1021 and the second inorganic encapsulation layer 1022, and a second organic encapsulation layer 1023-2 located on the side of the second inorganic encapsulation layer 1022 away from the first organic encapsulation layer 1023-1.

[0127] The touch display panel provided by the embodiment of the present disclosure includes two organic encapsulation layers, which can increase the overall thickness of the encapsulation layer, thereby increasing the distance between the touch conductive layer and the cathode, reducing the coupling capacitance between the touch electrode and the cathode, reducing noise, improving the signal-to-noise ratio, and improving touch accuracy.

[0128] In some embodiments, as shown in FIG. 15 , a minimum thickness h5 of the second organic encapsulating layer 1023 - 2 in the display area is less than a minimum thickness h3 of the first organic encapsulating layer 1023 - 1 in the display area.

[0129] In some embodiments, as shown in FIG16 , the orthographic projection of the second organic encapsulation layer 1023 - 2 on the base substrate 101 covers the orthographic projection of the first retaining wall 1001 on the base substrate 101 , and the orthographic projection of the second organic encapsulation layer 1023 - 2 on the base substrate 101 does not exceed the orthographic projection of the second retaining wall 1002 on the base substrate 101 .

[0130] In the touch display panel provided by the embodiment of the present disclosure, the minimum thickness of the second organic encapsulation layer in the display area is smaller than the minimum thickness of the first organic encapsulation layer in the display area, which can prevent the second organic encapsulation layer from crossing over the second retaining wall and reduce the process difficulty.

[0131] In some embodiments, the size of the touch display panel is greater than 10 inches, the minimum thickness of the first organic encapsulation layer 1023-1 in the display area AA is greater than or equal to 12 microns and less than or equal to 18 microns, and the minimum thickness of the second organic encapsulation layer 1023-2 in the display area AA is greater than or equal to 8 microns and less than or equal to 14 microns.

[0132] Next, an example is given to illustrate how the touch display panel provided by the embodiment of the present disclosure can increase the amount of touch signals when touched using an active stylus or a touch glove. Among them, A1 represents that the encapsulation layer includes a single organic encapsulation layer, and the minimum thickness of the organic encapsulation layer in the direction perpendicular to the base substrate is 12 μm. A2 represents that the encapsulation layer includes a single organic encapsulation layer, and the minimum thickness of the organic encapsulation layer in the direction perpendicular to the base substrate is 17 μm. A3 represents that the encapsulation layer includes a first organic encapsulation layer and a second organic encapsulation layer, and the minimum thickness of the second organic encapsulation layer in the direction perpendicular to the base substrate is 17 μm, and the minimum thickness of the first organic encapsulation layer in the direction perpendicular to the base substrate is 12 μm.

[0133] In related art, the minimum thickness of the organic encapsulation layer in a direction perpendicular to the base substrate of mobile phone products is approximately 8μm to 12μm. As shown in Table 3, when the encapsulation layer includes a single organic encapsulation layer and the minimum thickness of the organic encapsulation layer in the direction perpendicular to the base substrate is 12μm, the coupling capacitance of large-size products 13 inches and larger exceeds the specification limit (600pF). When the minimum thickness of the organic encapsulation layer in the direction perpendicular to the base substrate is increased to 17μm, the coupling capacitance of large-size products 13 inches and above is less than 600pF, meeting the specification limit. However, the coupling capacitance of large-size products 16 inches and larger exceeds the specification limit by exceeding 600pF. When the encapsulation layer includes a first organic encapsulation layer and a second organic encapsulation layer, the minimum thickness of the second organic encapsulation layer in the direction perpendicular to the base substrate is 17μm, and the minimum thickness of the first organic encapsulation layer in the direction perpendicular to the base substrate is 12μm. The coupling capacitance of large-size products of 13 inches and to 18 inches is less than 600pF, which meets the specification limits. In addition, the coupling capacitance of the double-layer organic encapsulation layer is 30% lower than the coupling capacitance of a single-layer organic encapsulation layer with a thickness of 17μm.

[0134] Table 3

[0135] Figure 17 shows a schematic diagram of touch control between the active stylus P1 and the first and second touch electrodes 5 and 6. Table 4 shows the coupling capacitance between the active stylus P1 and the first and second touch electrodes 5 and 6 at different locations (including the center region CT and the edge region Wr). Cp_t represents the coupling capacitance between the active stylus P1 and the second touch electrode 6, and Cp_r represents the coupling capacitance between the active stylus P1 and the first touch electrode 5. Capacitance is expressed in farads (fF). Table 4 shows that as the thickness and number of organic encapsulation layers increase, the coupling capacitance between the active stylus and the touch electrodes increases, which in turn increases the signal strength of the active stylus.

[0136] Table 4

[0137] Table 5 shows the active stylus signal attenuation for touch display panels of different sizes. This table indicates that in related art, when the encapsulation layer includes a single organic encapsulation layer with a minimum thickness of 12μm perpendicular to the substrate, the active stylus signal attenuation exceeds 30% for large-size touch display panels. This significant signal attenuation makes it impossible to guarantee the touch effect of the active stylus. As the thickness of the organic encapsulation layer increases to 17μm, the active stylus signal attenuation decreases significantly. When the encapsulation layer includes a double organic encapsulation layer, the active stylus signal attenuation decreases further.

[0138] Table 5

[0139] Table 6 shows the touch signal volume generated by a touch glove. As the thickness and number of organic encapsulation layers increase, the glove touch signal volume increases by approximately 30%. Furthermore, due to the reduced coupling capacitance, increasing the thickness and number of organic encapsulation layers can improve the SNR of the glove touch, enabling the application of in-vehicle glove touch products.

[0140] Table 6

[0141] In related technologies, as shown in Figures 12 and 13, the display signal da is coupled to the cathode, generating display noise. As the product size increases, the noise intensity of the display signal da coupled to the cathode increases, and the coupling capacitance between the touch electrode and the cathode also increases, resulting in higher noise in medium and large-sized touch display products. For automotive touch display products, as shown in Figure 14, a polarizer (POL), optically clear adhesive (OCA), and cover glass (CG) need to be stacked on the touch screen panel (TSP). The POL is 191μm, the OCA is 250μm, and the CG is 1.3mm. That is, the thickness of the transparent film layer stacked on the TSP is relatively thick. When using the touch glove Gl for touch control, the distance between the finger Fi and the touch glove Gl and the TSP is large, resulting in problems such as ghost points and non-reporting due to substandard SNR.

[0142] In view of this, an embodiment of the present disclosure provides a touch display panel, as shown in FIG3 and FIG15 , wherein the touch display panel includes a display area AA and a peripheral area NA surrounding the display area AA; the touch display panel includes:

[0143] Display substrate 1; the display substrate 1 comprises: a base substrate 101, a pixel definition layer 105 located on one side of the base substrate 101, and an encapsulation layer 102; the pixel definition layer 105 comprises a plurality of opening areas 1051, and the encapsulation layer 102 comprises at least one organic encapsulation layer 1023 on one side of the base substrate 101; the difference between the minimum thickness of the organic encapsulation layer 1023 included in the encapsulation layer 102 in the display area in a direction perpendicular to the base substrate 101 and a dimension h2 of the touch display panel is greater than or equal to 1 micron; wherein the minimum thickness of the organic encapsulation layer 1023 included in the encapsulation layer 102 in the display area in a direction perpendicular to the base substrate 101 is the thickness of the organic encapsulation layer 1023 corresponding to the position where the pixel definition layer 105 is located in the direction perpendicular to the base substrate 101;

[0144] The touch layer 2 is located on the display side of the display substrate 1 .

[0145] In the touch display panel provided by the embodiment of the present disclosure, the difference between the minimum thickness of the organic encapsulation layer in the display area in a direction perpendicular to the base substrate and the size h2 of the touch display panel is greater than or equal to 1 micron, so that the thickness of the organic encapsulation layer can be adjusted according to the size of the touch display panel. When the size of the touch display panel increases, the thickness of the organic encapsulation layer also increases, thereby increasing the distance between the touch conductive layer and the cathode, reducing the coupling capacitance between the touch electrode and the cathode, reducing noise, improving the signal-to-noise ratio, and improving touch accuracy.

[0146] In some embodiments, as shown in FIG. 3 , the encapsulation layer 102 includes an organic encapsulation layer 1023 .

[0147] In some embodiments, as shown in Figure 3, the encapsulation layer 102 also includes: a first inorganic encapsulation layer 1021, and a second inorganic encapsulation layer 1022 located on the side of the first inorganic encapsulation layer 1021 away from the base substrate 101; at least one layer of organic encapsulation layer 1023 includes: a first organic encapsulation layer 1023-1 located between the first inorganic encapsulation layer 1021 and the second inorganic encapsulation layer 1022.

[0148] In some embodiments, in the display area AA, a difference between a minimum thickness h3 of the first organic encapsulation layer 1023 - 1 in a direction perpendicular to the base substrate 101 and a size h2 of the touch display panel is equal to 1 micrometer.

[0149] In the touch display panel provided by the disclosed embodiment, the difference between the minimum thickness of a single first organic encapsulation layer in a direction perpendicular to the base substrate and the size h2 of the touch display panel is equal to 1 micron. This allows the thickness of the first organic encapsulation layer to be adjusted according to the size of the touch display panel. As the size of the touch display panel increases, the thickness of the organic encapsulation layer also increases, thereby increasing the distance between the touch conductive layer and the cathode, reducing the coupling capacitance between the touch electrode and the cathode, reducing noise, improving the signal-to-noise ratio, and enhancing touch accuracy. This avoids problems such as ghost points and non-point reporting when using an active stylus or touch gloves for touch control.

[0150] In some embodiments, the size of the touch display panel is greater than 10 inches. In the display area AA, the minimum thickness h3 of the first organic encapsulation layer 1023 - 1 in a direction perpendicular to the base substrate 101 is greater than or equal to 14 microns and less than or equal to 18 microns.

[0151] In some embodiments, in the peripheral area, as shown in Figure 7, the touch display panel also includes a plurality of retaining walls 10, and the retaining walls 10 are projected on the base substrate 101 to surround the display area (not shown); the plurality of retaining walls 10 include: a first retaining wall 1001, and a second retaining wall 1002 located on the side of the first retaining wall 1001 away from the display area (not shown).

[0152] In some embodiments, the first organic encapsulation layer does not exceed the first barrier wall 1001 .

[0153] In the touch display panel provided by the embodiment of the present disclosure, when the size of the touch display panel is greater than 10 inches, the minimum thickness of the single-layer first organic encapsulation layer in a direction perpendicular to the base substrate is greater than or equal to 14 microns, which is beneficial for increasing the distance between the touch conductive layer and the cathode. The minimum thickness of the single-layer first organic encapsulation layer in a direction perpendicular to the base substrate is less than or equal to 18 microns, which can prevent the organic encapsulation layer from crossing the first barrier wall and reduce the process difficulty.

[0154] Alternatively, in some embodiments, as shown in Figures 15 and 16, the encapsulation layer 102 also includes: a first inorganic encapsulation layer 1021, and a second inorganic encapsulation layer 1022 located on the side of the first inorganic encapsulation layer 1021 away from the base substrate 101; at least one organic encapsulation layer 1023 includes: a first organic encapsulation layer 1023-1 located between the first inorganic encapsulation layer 1021 and the second inorganic encapsulation layer 1022, and a second organic encapsulation layer 1023-2 located on the side of the second inorganic encapsulation layer 1022 away from the first organic encapsulation layer 1023-1.

[0155] The touch display panel provided by the embodiment of the present disclosure includes two organic encapsulation layers, which can increase the overall thickness of the encapsulation layer, thereby increasing the distance between the touch conductive layer and the cathode, reducing the coupling capacitance between the touch electrode and the cathode, reducing noise, improving the signal-to-noise ratio, and improving touch accuracy.

[0156] In some embodiments, as shown in FIG. 15 , a minimum thickness h5 of the second organic encapsulating layer 1023 - 2 in the display area is less than a minimum thickness h3 of the first organic encapsulating layer 1023 - 1 in the display area.

[0157] In some embodiments, as shown in FIG16 , the orthographic projection of the second organic encapsulation layer 1023 - 2 on the base substrate 101 covers the orthographic projection of the first retaining wall 1001 on the base substrate 101 , and the orthographic projection of the second organic encapsulation layer 1023 - 2 on the base substrate 101 does not exceed the orthographic projection of the second retaining wall 1002 on the base substrate 101 .

[0158] In the touch display panel provided by the embodiment of the present disclosure, the minimum thickness of the second organic encapsulation layer in the display area is smaller than the minimum thickness of the first organic encapsulation layer in the display area, which can prevent the second organic encapsulation layer from crossing over the second retaining wall and reduce the process difficulty.

[0159] In some embodiments, the size of the touch display panel is greater than 10 inches, the minimum thickness of the first organic encapsulation layer 1023-1 in the display area AA is greater than or equal to 12 microns and less than or equal to 18 microns, and the minimum thickness of the second organic encapsulation layer 1023-2 in the display area AA is greater than or equal to 8 microns and less than or equal to 14 microns.

[0160] The touch display panel provided by the embodiment of the present disclosure can improve the touch signal quantity by increasing the thickness of the organic encapsulation layer. Please refer to Tables 3 to 6 and related descriptions, which will not be repeated here.

[0161] In some embodiments, the multi-layer touch conductive layer includes a plurality of touch electrodes. As shown in FIG4 , in the display area AA, the plurality of touch electrodes include a plurality of first touch electrodes 5 and a plurality of second touch electrodes 6 ;

[0162] The plurality of first touch electrodes 5 are arranged along the first direction X and extend along the second direction Y. The first touch electrode 201 includes a plurality of first sub-electrodes 501 arranged along the second direction Y and a bridge electrode 502 electrically connecting two adjacent first sub-electrodes 501 .

[0163] The plurality of second touch electrodes 6 extend along the first direction X and are arranged along the second direction Y. The second touch electrodes 6 include a plurality of second sub-electrodes 601 arranged along the first direction X.

[0164] In some embodiments, as shown in FIG8 to FIG11 , the touch layer 2 includes a multi-layer touch conductive layer 201 ; the multi-layer touch conductive layer 201 includes: a first touch conductive layer 201 - 1 and a second touch conductive layer 201 - 2 located on a side of the first touch conductive layer 201 - 1 facing away from the display substrate 1 ;

[0165] The touch layer 2 further includes: a touch insulating layer 202 located between the first touch conductive layer 201 - 1 and the second touch conductive layer 201 - 2 ;

[0166] The first sub-electrode 501 and the second sub-electrode 601 are located in one touch conductive layer 201 , and the bridge electrode 502 is located in the other touch conductive layer 201 . The bridge electrode 502 is electrically connected to the first sub-electrode 501 through a first via 3 penetrating the touch insulating layer 202 .

[0167] It should be noted that Figure 8 is a cross-sectional view along EE' in Figure 2, Figure 9 is a cross-sectional view along FF' in Figure 2, Figure 10 is another cross-sectional view along EE' in Figure 2, and Figure 11 is another cross-sectional view along FF' in Figure 2. Figures 8 to 11 are exemplified by the example in which the first sub-electrode 501 and the second sub-electrode 601 are located in the second touch conductive layer 201-2 and the bridging electrode 502 is located in the first touch conductive layer 201-1.

[0168] In some embodiments, as shown in FIG2 , the metal mesh structure 7 is formed by interweaving a plurality of metal wires 2011 so that the metal mesh structure 7 includes a plurality of meshes 701, that is, the mesh 701 is a polygon formed by a plurality of metal wires, or in other words, the metal mesh structure 7 is formed by repeatedly and continuously setting up meshes 701. As shown in FIG2 , the shape of the mesh 701 surrounded by the metal wires 2011 is a rectangle. Alternatively, the shape of the mesh surrounded by the metal wires can be a rhombus, a triangle, a hexagon, etc., or the shape of the mesh surrounded by the metal wires can be a combination of multiple shapes, such as a combination of a pentagon and a hexagon, or the shape of the mesh surrounded by the metal wires can include any one or more of a triangle, a square, a rectangle, a rhombus, a trapezoid, a pentagon, and a hexagon. In a specific implementation, the mesh pattern surrounded by the metal wires can be a regular shape or an irregular shape, and the edges of the mesh can be straight lines or curves, which are not limited in the embodiments of the present disclosure. The edge of the metal mesh structure can also include an incomplete mesh pattern.

[0169] In a specific implementation, as shown in FIG2 , a plurality of cutouts 4 may be provided on the grid 701. For portions located on the same touch conductive layer 201 and requiring mutual insulation, for example, when the grid 701 of the first sub-electrode 501 and the grid 701 of the second sub-electrode 6011 are located on the same layer, the cutouts 4 may be provided on the entire surface of the grid 701 pattern to achieve isolation between the grid 701 of the first sub-electrode 501 and the grid 701 of the second sub-electrode 6011.

[0170] The touch electrodes provided in the embodiments of the present disclosure include a metal mesh structure. The first touch electrodes and the second touch electrodes in the metal mesh structure have advantages such as low resistance, small thickness, and fast response speed, which can improve the sensitivity and accuracy of touch recognition.

[0171] In a specific implementation, the grids in the first touch conductive layer and the grids in the second touch conductive layer have the same shape, size, and metal line width, and the orthographic projections of the grids in the first touch conductive layer and the grids in the second touch conductive layer on the base substrate have approximately overlapping areas.

[0172] In some embodiments, the display area AA includes multiple sub-pixels; as shown in Figure 3, the display substrate 1 specifically includes: a base substrate 101, a driving circuit layer 103 located on one side of the base substrate 101, a pixel definition layer 105 and a plurality of light-emitting devices 104 located on the side of the driving circuit layer 103 away from the base substrate 101; the encapsulation layer 102 is located on the side of the light-emitting device 104 away from the base substrate; wherein the light-emitting device 104 corresponds one-to-one to the sub-pixel.

[0173] In some embodiments, as shown in Figure 3, the light-emitting device 104 includes an anode 1041, a light-emitting functional layer 1042, and a cathode 1043 that are stacked together. The pixel definition layer 105 includes an opening area 1051 that corresponds one-to-one to the sub-pixels. The pixel definition layer 105 covers the edge of the anode 1041, and the orthographic projection of the opening area 1051 on the substrate 101 falls within the orthographic projection of the anode 1041 on the substrate 101. The light-emitting functional layer 1042 is located on the side of the anode 1041 and the pixel definition layer 105 that is away from the substrate 101, and the cathode 1043 is located on the side of the light-emitting functional layer 1042 that is away from the substrate 101.

[0174] In a specific implementation, if the light-emitting device is an organic light-emitting diode, the light-emitting functional layer includes at least an organic light-emitting layer, and may also include at least one of the following: an electron injection layer, a hole blocking layer, an electron transport layer, a hole transport layer, an electron blocking layer, and a hole injection layer.

[0175] In some embodiments, as shown in FIG3 , the driver circuit layer 103 includes a pixel driver circuit that corresponds one-to-one with the light-emitting device 104 and drives the light-emitting device 104 to emit light. The pixel driver circuit includes, for example, a thin-film transistor 1031 and a capacitor 1032. It should be noted that FIG3 only shows one thin-film transistor 1031 and one capacitor 1032. In specific implementations, the pixel driver circuit may also include a larger number of thin-film transistors and capacitors.

[0176] It should be noted that FIG3 illustrates a top-gate thin-film transistor 1031, where the gate G is located on the side of the active layer 10311 facing away from the base substrate 101. A first electrode 10321 of the capacitor 1032 is provided on the same layer as the gate G, and a second electrode 10322 of the capacitor 1032 is located between the film layer where the gate G is located and the film layer where the source S and drain D are located. The display substrate 1 further includes: a first buffer layer 1033 located between the base substrate 101 and the active layer 10311; a first gate insulating layer 1034 located between the gate G and the active layer 10311; a second gate insulating layer 1035 located between the first electrode 10321 and the second electrode 10322; and an interlayer insulating layer 1036 located between the second electrode 10322 and the source S and drain D. Furthermore, a first planarization layer 106 is located between the source S and drain D and the anode 1041.

[0177] In some embodiments, the anode is connected to the drain through a via hole penetrating the first planarization layer.

[0178] Alternatively, in some embodiments, as shown in FIG3 , the display substrate 1 further includes a switching electrode 1039 located between the source electrode S, the drain electrode D, and the anode 1041, a passivation layer 1037 located between the source electrode S, the drain electrode D, and the switching electrode 1039, and a second planarization layer 1038 located between the passivation layer 1037 and the switching electrode 1039. The anode 1041 is connected to the switching electrode 1039 via a via hole penetrating the first planarization layer 106, and the switching electrode 1039 is connected to the drain electrode D via a via hole penetrating the second planarization layer 1038 and the passivation layer 1037.

[0179] In some embodiments, as shown in FIG2 , the orthographic projection of the opening 1051 on the substrate falls within the orthographic projection of the grid 701 on the substrate 101. That is, the orthographic projection of the metal line 2011 on the substrate does not overlap with the orthographic projection of the opening 1051 on the substrate. This prevents the metal line 2011 from affecting the normal display of the display substrate.

[0180] In some embodiments, as shown in FIG3 , the touch layer 2 further includes: a second buffer layer 203 located between the first touch conductive layer (not shown) and the encapsulation layer 102 , and a protective layer 204 located on a side of the second touch conductive layer 201 - 2 facing away from the base substrate 101 .

[0181] The embodiment of the present disclosure adopts FMLOC technology, that is, the touch layer is directly manufactured on the stacked light-emitting structure layer and the packaging layer, which can reduce the thickness of the touch display panel and is conducive to realizing the lightweight and thin touch display product.

[0182] In some embodiments, as shown in FIG6 , the touch layer further includes a plurality of touch traces 8 ; the plurality of touch traces 8 include: a plurality of first touch traces 801 and a plurality of second touch traces 802 ; the touch display panel further includes a plurality of binding electrodes 9 ;

[0183] The touch trace 8 extends from one end of the first touch electrode 5 or the second touch electrode 6 through the peripheral area NA and is electrically connected to the binding electrode 9 .

[0184] In some embodiments, the touch traces also include a metal grid structure formed by interweaving metal wires.

[0185] In some embodiments, the touch traces are located on at least one touch conductive layer.

[0186] In some embodiments, the touch traces are located in the first touch conductive layer or the second touch conductive layer.

[0187] Alternatively, in some embodiments, as shown in FIG7 , the touch trace 8 includes a first sub-trace 8-1 located in the first touch conductive layer 201-1 and a second sub-trace 8-2 located in the second touch conductive layer 201-2. The second sub-trace 8-2 is electrically connected to the first sub-trace 8-1 via a via penetrating the touch insulating layer 202. This means that the touch traces are arranged in two layers. By connecting the first and second sub-trace in parallel, the impedance of the touch traces can be reduced.

[0188] An embodiment of the present disclosure provides a display device, which includes the touch display panel provided by the embodiment of the present disclosure.

[0189] The display device provided in the embodiments of the present disclosure is any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system. Other essential components of the display device are readily understood by those skilled in the art and are not described here in detail, nor should they be construed as limitations of the present disclosure. The implementation of the display device can be referenced to the aforementioned embodiments of the touch display panel, and any repetitive details will not be repeated.

[0190] In summary, the touch display panel and display device provided by the embodiments of the present disclosure, when h1>2.5, the line width h1 of the metal lines included in the touch layer and the size h2 of the touch display panel satisfy: 1.5≤h2 / h1≤3.6. The larger the size h2 of the touch display panel, the larger the line width h1 of the metal lines. Therefore, as the size of the touch display panel increases, the resistance of the touch conductive layer is reduced by correspondingly increasing the line width of the metal lines, thereby reducing the RC loading. When an active stylus is used for touch control, signal attenuation can be reduced, thereby improving the signal-to-noise ratio, hovering touch, linearity, and accuracy of the active stylus. In addition, h2 / h1≤3.6 avoids the situation where h2 / h1 exceeds 3.6 and the increase in line width cannot meet the RC loading required by the touch display panel size. 1.5≤h2 / h1 can prevent the metal lines from being too wide and blocking the opening area of ​​the display substrate, thereby avoiding affecting the light output rate of the touch display panel.

[0191] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0192] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. A touch display panel, wherein: The touch display panel includes: display substrate; The touch layer is located on the display side of the display substrate and includes a multi-layer touch conductive layer; the touch conductive layer includes: a metal grid structure formed by interweaving multiple metal wires; the line width h1 of the metal wire and the size h2 of the touch display panel satisfy: h1>2.5, 1.5≤h2 / h1≤3.6, wherein the unit of the line width h1 of the metal wire is micrometer, and the unit of the size h2 of the touch display panel is inch.

2. The touch display panel according to claim 1, wherein: The size of the display panel is less than 10 inches, and the width of the metal line is less than or equal to 4 microns.

3. The touch display panel according to claim 1, wherein: The size of the display panel is greater than or equal to 10 inches, and the width of the metal line is greater than or equal to 5 microns and less than or equal to 6.5 microns.

4. The touch display panel according to any one of claims 1 to 3, wherein: The multi-layer touch conductive layer includes: a first touch conductive layer and a second touch conductive layer located on a side of the first touch conductive layer facing away from the encapsulation layer; the touch layer further includes: a touch insulating layer located between the first touch conductive layer and the second touch conductive layer; The thickness of the first touch conductive layer is greater than or equal to 0.34 micrometers, and the thickness of the second touch conductive layer is greater than or equal to 0.42 micrometers.

5. The touch display panel according to claim 4, wherein: The touch insulating layer is an inorganic touch insulating layer; The thickness of the first touch conductive layer is less than or equal to 0.42 micrometers, the thickness of the inorganic touch insulating layer is greater than or equal to 0.35 micrometers and less than or equal to 0.43 micrometers, and the thickness of the second touch conductive layer is less than or equal to 0.5 micrometers.

6. The touch display panel according to claim 4, wherein: The touch insulating layer is an organic touch insulating layer; The thickness of the first touch conductive layer is less than or equal to 0.72 micrometers, the thickness of the organic touch insulating layer is greater than or equal to 1.4 micrometers and less than or equal to 1.8 micrometers, and the thickness of the second touch conductive layer is less than or equal to 0.72 micrometers.

7. The touch display panel according to claim 4, wherein: The thickness of the first touch conductive layer is equal to the thickness of the second touch conductive layer.

8. The touch display panel according to any one of claims 1 to 3 and 5 to 7, wherein: The touch display panel includes a display area and a peripheral area surrounding the display area; the display substrate includes: substrate; A pixel definition layer is located on one side of the base substrate and includes a plurality of opening areas; The encapsulation layer includes at least one organic encapsulation layer on the side of the pixel definition layer facing away from the base substrate; in the display area, the difference between the minimum thickness of the organic encapsulation layer included in the encapsulation layer in the direction perpendicular to the base substrate and the size h2 of the touch display panel is greater than or equal to 1 micron; wherein, in the display area, the minimum thickness of the organic encapsulation layer included in the encapsulation layer in the direction perpendicular to the base substrate is the thickness of the organic encapsulation layer corresponding to the position of the pixel definition layer in the direction perpendicular to the base substrate.

9. The touch display panel according to claim 8, wherein: The touch display panel has a size greater than 10 inches; the encapsulation layer further comprises: a first inorganic encapsulation layer, and a second inorganic encapsulation layer located on a side of the first inorganic encapsulation layer facing away from the base substrate; the at least one organic encapsulation layer comprises: a first organic encapsulation layer located between the first inorganic encapsulation layer and the second inorganic encapsulation layer; In the display area, a minimum thickness h3 of the first organic encapsulation layer in a direction perpendicular to the base substrate is greater than or equal to 14 micrometers and less than or equal to 18 micrometers.

10. The touch display panel according to claim 9, wherein: In the display area, a difference between a minimum thickness h3 of the first organic encapsulation layer in a direction perpendicular to the base substrate and a size h2 of the touch display panel is equal to 1 micron.

11. The touch display panel according to claim 8, wherein: The encapsulation layer also includes: a first inorganic encapsulation layer, and a second inorganic encapsulation layer located on the side of the first inorganic encapsulation layer facing away from the base substrate; at least one layer of the organic encapsulation layer includes: a first organic encapsulation layer located between the first inorganic encapsulation layer and the second inorganic encapsulation layer, and a second organic encapsulation layer located on the side of the second inorganic encapsulation layer facing away from the first organic encapsulation layer.

12. The touch display panel according to claim 11, wherein: The minimum thickness of the second organic encapsulation layer in the display area is smaller than the minimum thickness of the first organic encapsulation layer in the display area.

13. The touch display panel according to claim 12, wherein: The size of the touch display panel is greater than 10 inches; the minimum thickness of the first organic encapsulation layer in the display area is greater than or equal to 12 microns and less than or equal to 18 microns, and the minimum thickness of the second organic encapsulation layer in the display area is greater than or equal to 8 microns and less than or equal to 14 microns.

14. A touch display panel, wherein: The touch display panel includes a display area and a peripheral area surrounding the display area; The touch display panel includes: A display substrate; the display substrate comprises: a base substrate, a pixel definition layer and an encapsulation layer located on one side of the base substrate; the pixel definition layer comprises a plurality of opening areas, and the encapsulation layer comprises at least one organic encapsulation layer on a side of the pixel definition layer facing away from the base substrate; in the display area, the difference between the minimum thickness of the organic encapsulation layer in a direction perpendicular to the base substrate and the dimension h2 of the touch display panel is greater than or equal to 1 micron; wherein, in the display area, the minimum thickness of the organic encapsulation layer in a direction perpendicular to the base substrate is the thickness of the organic encapsulation layer in a direction perpendicular to the base substrate corresponding to the position where the pixel definition layer is located; The touch layer is located on the display side of the display substrate.

15. The touch display panel according to claim 14, wherein: The touch display panel has a size greater than 10 inches; the encapsulation layer further comprises: a first inorganic encapsulation layer, and a second inorganic encapsulation layer located on a side of the first inorganic encapsulation layer facing away from the base substrate; the at least one organic encapsulation layer comprises: a first organic encapsulation layer located between the first inorganic encapsulation layer and the second inorganic encapsulation layer; In the display area, a minimum thickness h3 of the first organic encapsulation layer in a direction perpendicular to the base substrate is greater than or equal to 14 micrometers and less than or equal to 18 micrometers.

16. The touch display panel according to claim 15, wherein: In the display area, a difference between a minimum thickness h3 of the first organic encapsulation layer in a direction perpendicular to the base substrate and a size h2 of the touch display panel is equal to 1 micron.

17. The touch display panel according to claim 14, wherein: The encapsulation layer also includes: a first inorganic encapsulation layer, and a second inorganic encapsulation layer located on the side of the first inorganic encapsulation layer facing away from the base substrate; at least one layer of the organic encapsulation layer includes: a first organic encapsulation layer located between the first inorganic encapsulation layer and the second inorganic encapsulation layer, and a second organic encapsulation layer located on the side of the second inorganic encapsulation layer facing away from the first organic encapsulation layer.

18. The touch display panel according to claim 17, wherein: The minimum thickness of the second organic encapsulation layer in the display area is smaller than the minimum thickness of the first organic encapsulation layer in the display area.

19. The touch display panel according to claim 18, wherein: The size of the touch display panel is greater than 10 inches; the minimum thickness of the first organic encapsulation layer in the display area is greater than or equal to 12 microns and less than or equal to 18 microns, and the minimum thickness of the second organic encapsulation layer in the display area is greater than or equal to 8 microns and less than or equal to 14 microns.

20. A display device, wherein: The display device includes the touch display panel according to any one of claims 1 to 19.

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