Touch display panel and display device

Abstract

Disclosed in the present invention are a touch display panel and a display device, for use in improving the touch accuracy and linearity of an active stylus. The touch display panel provided by the present invention supports touch operation on the basis of the active stylus. The touch display panel comprises: a display substrate; multiple touch conductive layers located on a display side of the display substrate. The orthographic projections of the multiple touch conductive layers on the display substrate form multiple touch units arranged in an array in a first direction and a second direction; the touch units comprise multiple touch sub-units arranged in n rows × n columns, wherein n is an integer greater than or equal to 2; the first direction intersects with the second direction; the extension direction of each row of touch sub-units is the first direction, and the extension direction of each column of touch sub-units is the second direction; and the width h1 of the touch sub-units in the first direction, the width h2 of the touch sub-units in the second direction, and the diameter D of the tip of the active stylus satisfy: formulas (1) and (2).

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 Intellectual Property Office of the People's Republic of China on February 26, 2024, with application number 202410211738.6 and invention name "Touch Display Panel and Display Device", the entire content of which is 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 touch technology, capacitive touch screens can now be controlled by stylus pens in addition to the common finger touch. Stylus pens are divided into passive pens and active pens. Active pens have a smaller tip and combine pen pressure, hover touch, and button functions, offering a wider range of applications and prospects than passive pens.

[0005] 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, the accuracy and linearity of touch control using active pens on medium and large-sized touchscreens are intertwined, affecting touch performance. Summary of the Invention

[0006] Embodiments of the present disclosure provide a touch display panel and a display device to improve the touch accuracy and linearity of an active stylus.

[0007] An embodiment of the present disclosure provides a touch display panel, which is touch-controlled based on an active stylus. The touch display panel includes:

[0008] display substrate;

[0009] A multi-layer touch conductive layer is located on a display side of a display substrate; an orthographic projection of the multi-layer touch conductive layer on the display substrate is divided into: a plurality of touch units arranged in an array along a first direction and a second direction; the touch units include a plurality of touch sub-units arranged in n rows by n columns, where n is an integer greater than or equal to 2; the first direction intersects the second direction, the touch sub-units in each row extend in the first direction, and the touch sub-units in each column extend in the second direction; a width h1 of the touch sub-units in the first direction, a width h2 of the touch sub-units in the second direction, and a tip diameter D of the active stylus satisfy the following conditions:

[0010] In some embodiments, 1 mm ≤ D ≤ 1.2 mm;

[0011] n = 3, 1.2 ≤ h1 ≤ 1.4, 1.2 ≤ h2 ≤ 1.4.

[0012] In some embodiments, 1 mm ≤ D ≤ 1.2 mm;

[0013] n = 4, 0.9 ≤ h1 ≤ 1.05, 0.9 ≤ h2 ≤ 1.05.

[0014] In some embodiments, 1.2 mm < D ≤ 1.5 mm;

[0015] n = 3, 1.2 ≤ h1 ≤ 1.4, 1.2 ≤ h2 ≤ 1.4;

[0016] In some embodiments, 1.2 mm < D ≤ 1.5 mm;

[0017] n = 2, 1.9 ≤ h1 ≤ 2.1, 1.9 ≤ h2 ≤ 2.1.

[0018] In some embodiments, the touch conductive layer includes: a metal grid structure formed by interweaving multiple metal wires;

[0019] The multi - layer touch conductive layer includes a first touch conductive layer and a second touch conductive layer; the orthographic projection of the first touch conductive layer on the display substrate and the orthographic projection of the second touch conductive layer on the display substrate have an overlapping area;

[0020] The line width of the metal wires of the first touch conductive layer in the overlapping area is less than the line width of the metal wires of the first touch conductive layer in the remaining areas;

[0021] The line width of the metal wires of the second touch conductive layer in the overlapping area is less than the line width of the metal wires of the second touch conductive layer in the remaining areas.

[0022] In some embodiments, the touch sub - unit includes: a first electrode structure and a second electrode structure arranged cross -wise; the first electrode structure includes two first sub - electrodes arranged along the second direction and a bridging electrode electrically connecting the two first sub - electrodes; the second electrode structure includes two second sub - electrodes arranged along the first direction;

[0023] The first sub - electrode and the second sub - electrode are located in the same touch conductive layer, and the bridging electrode is located in a different touch conductive layer from the first sub - electrode and the second sub - electrode;

[0024] The orthographic projection of the bridging electrode on the display substrate and the orthographic projection of the second sub - electrode on the display substrate have an overlap.

[0025] In some embodiments, the touch unit includes n rows of second electrode structures and n columns of first electrode structures;

[0026] The multiple rows of second electrode structures located in the same row of touch units are electrically connected to each other, and the multiple columns of first electrode structures located in the same column of touch units are electrically connected to each other;

[0027] Alternatively, multiple rows of second electrode structures located in the same row of touch units are used to access the same touch signal, and multiple columns of first electrode structures located in the same column of touch units are used to access the same touch signal.

[0028] In some embodiments, the touch conductive layer includes metal lines;

[0029] The bridging electrode includes m metal wires arranged along a first direction; m is an integer greater than 2.

[0030] In some embodiments, the touch conductive layer includes metal lines;

[0031] In an area where an orthographic projection of the bridging electrode on the display substrate overlaps with an orthographic projection of the second sub-electrode on the display substrate, the second sub-electrode includes k metal wires arranged along the second direction; k is an integer greater than 2.

[0032] In some embodiments, the touch conductive layer includes metal lines whose extension direction intersects both the first direction and the second direction;

[0033] The shape formed by the orthographic projection of the metal wires of the bridge electrode on the display substrate is a rectangle.

[0034] In some embodiments, a distance between the first sub-electrode and the second sub-electrode is greater than or equal to 40 micrometers and less than or equal to 80 micrometers.

[0035] In some embodiments, the outline of the touch subunit is rectangular;

[0036] The outline of the first sub-electrode close to the second sub-electrode and the outline of the second sub-electrode close to the first sub-electrode are both broken lines.

[0037] In some embodiments, the outline of the first sub-electrode close to the second sub-electrode and the outline of the second sub-electrode close to the first sub-electrode both include multiple alternating first line segments and second line segments, the first line segments extend along the first direction, and the second line segments extend along the second direction.

[0038] In some embodiments, the first sub-electrode includes a first rectangular region and a first region located on one side of the first rectangular region in the second direction;

[0039] The second sub-electrode includes a second rectangular area and a second area located on one side of the second rectangular area in the first direction;

[0040] The outline of the pattern consisting of two first areas located between two first rectangular areas in the second direction and two second areas located between two second rectangular areas in the first direction is a rectangle.

[0041] An embodiment of the present disclosure provides a display device, which includes the touch display panel provided by the embodiment of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 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.

[0043] FIG1 is a schematic structural diagram of a touch display panel provided by an embodiment of the present disclosure;

[0044] FIG2 is an enlarged schematic diagram of a touch unit in the structure of a touch display panel provided by an embodiment of the present disclosure;

[0045] FIG3 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0046] FIG4 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0047] FIG5 is a cross-sectional view along line EE' in FIG4 provided by an embodiment of the present disclosure;

[0048] FIG6 is a cross-sectional view along line FF′ in FIG4 provided by an embodiment of the present disclosure;

[0049] FIG7 is a schematic structural diagram of a touch display panel provided by the related art;

[0050] FIG8 is a schematic diagram of the positions of standard coordinates and algorithm coordinates of a touch display panel provided by the related art;

[0051] FIG9 is a schematic diagram of the positions of standard coordinates and algorithm coordinates of a touch display panel provided by an embodiment of the present disclosure;

[0052] FIG10 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0053] FIG11 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0054] FIG12 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0055] FIG13 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0056] FIG14 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0057] FIG15 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0058] FIG16 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0059] FIG17 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0060] FIG18 is a schematic diagram showing electrical connections of a first electrode structure or a second electrode structure of a touch display panel provided by an embodiment of the present disclosure;

[0061] FIG19 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0062] FIG20 is a schematic diagram showing electrical connections of a first electrode structure or a second electrode structure of another touch display panel provided by an embodiment of the present disclosure;

[0063] FIG21 is a schematic structural diagram of another touch display panel provided by an embodiment of the present disclosure;

[0064] FIG22 is a schematic structural diagram of another touch display panel provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0065] 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.

[0066] 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.

[0067] 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.

[0068] In related technologies, the diameter of the tip of the active stylus is significantly different from the size of the touch sub-unit. When the active stylus is used to perform touch operations on the touch display panel, the signal amount sensed by the touch electrodes in different areas may change suddenly, resulting in a large deviation between the actual sensed touch position and the actual touch position, and poor touch accuracy and linearity.

[0069] The present disclosure provides a touch display panel 1, as shown in FIG1 , FIG2 , and FIG3 . The touch display panel 1 is touch-controlled based on an active stylus 2 . The touch display panel 1 includes:

[0070] Display substrate 3;

[0071] A multilayer touch conductive layer 4 is located on the display side of the display substrate 3. The orthographic projection of the multilayer touch conductive layer 4 on the display substrate 3 is divided into: a plurality of touch units 5 arranged in an array along a first direction X and a second direction Y. The touch units 5 include a plurality of touch sub-units 501 arranged in n rows by n columns, where n is an integer greater than or equal to 2. The first direction X intersects the second direction Y, and the touch sub-units 501 in each row extend in the first direction X, while the touch sub-units 501 in each column extend in the second direction Y. The width h1 of the touch sub-units 501 in the first direction X, the width h2 of the touch sub-units 501 in the second direction Y, and the tip diameter D of the active stylus 2 satisfy the following conditions:

[0072] It should be noted that when Less than 0.7, If the active stylus tip diameter is less than 0.7, the active stylus tip diameter is larger than the width of the touch subunit in the first direction and the width in the second direction, and the size difference between the touch subunit and the active stylus tip diameter is too large. When the active stylus is used to touch different areas, there will be a large deviation between the actual sensed touch position and the actual touch position due to the sudden change of the signal. Similarly, when Greater than 1.8, If the width of the touch subunit in the first direction and the width in the second direction are greater than the diameter of the active stylus tip, the size difference between the touch subunit and the diameter of the active stylus tip will be too large. When the active stylus is used to touch different areas, there will be a large deviation between the actual sensed touch position and the actual touch position due to the sudden change in the signal amount. equal to 0.7, equal to 0.7. Even if the tip diameter of the active stylus is greater than the width of the touch sub-unit in the first direction and the width in the second direction, since the difference between the tip diameter of the active stylus and the size of the touch sub-unit is small, there will be no sudden change in the signal volume when the active stylus passes through different regions, and the deviation between the actually sensed touch position and the actual touch position is not large. Similarly, when equal to 1.8, equal to 1.8. Even if the width of the touch sub-unit in the first direction and the width in the second direction are greater than the tip diameter of the active stylus, since the difference between the tip diameter of the active stylus and the size of the touch sub-unit is small, there will be no sudden change in the signal volume when the active stylus passes through different regions, and the deviation between the actually sensed touch position and the actual touch position is not large. When it can satisfy that the difference between the size of the touch sub-unit and the tip diameter of the active stylus is small, which can avoid sudden changes in the signal volume when the active stylus passes through different regions, avoid large deviations between the actually sensed touch position and the actual touch position, and can improve touch accuracy and linearity.

[0073] It should be noted that FIG. 2 is an enlarged schematic diagram of a touch unit.

[0074] It should be noted that the tip of the active stylus is a part of a spherical surface, and the tip diameter of the active stylus refers to the diameter of the spherical surface.

[0075] In some embodiments, h1 = h2.

[0076] In some embodiments, 1 mm ≤ D ≤ 1.2 mm;

[0077] n = 3, 1.2 ≤ h1 ≤ 1.4, 1.2 ≤ h2 ≤ 1.4.

[0078] In some embodiments, 1 mm ≤ D ≤ 1.2 mm;

[0079] n = 4, 0.9 ≤ h1 ≤ 1.05, 0.9 ≤ h2 ≤ 1.05.

[0080] In some embodiments, 1.2 mm < D ≤ 1.5 mm;

[0081] n = 3, 1.2 ≤ h1 ≤ 1.4, 1.2 ≤ h2 ≤ 1.4;

[0082] In some embodiments, 1.2 mm < D ≤ 1.5 mm;

[0083] n = 2, 1.9 ≤ h1 ≤ 2.1, 1.9 ≤ h2 ≤ 2.1.

[0084] In some embodiments, as shown in FIG2 , the touch sub-unit 501 includes: a first electrode structure 601 and a second electrode structure 602 arranged in a cross pattern, that is, the two electrode structures form a bridge structure 6; the first electrode structure 601 includes two first sub-electrodes 6011 arranged along a second direction Y, and a bridge electrode 6012 electrically connecting the two first sub-electrodes 6011; the second electrode structure 602 includes two second sub-electrodes 6021 arranged along a first direction X;

[0085] The first sub-electrode 6011 and the second sub-electrode 6021 are located in the same touch conductive layer 4 , and the bridge electrode 6012 and the first sub-electrode 6011 and the second sub-electrode 6021 are located in different touch conductive layers 4 ;

[0086] The orthographic projection of the bridging electrode 6012 on the display substrate 3 overlaps with the orthographic projection of the second sub-electrode 6021 on the display substrate 3 .

[0087] In some embodiments, as shown in FIG2 , two adjacent first sub-electrodes 6011 located in different bridge structures 6 are integrally connected;

[0088] The second sub-electrodes 6021 located in the same row are connected as one.

[0089] In some embodiments, the touch unit 5 includes n rows of second electrode structures 602 and n columns of first electrode structures 601 .

[0090] In some embodiments, multiple rows of second electrode structures 602 located in the same row of touch units 5 are electrically connected to each other, and multiple columns of first electrode structures 601 located in the same column of touch units 5 are electrically connected to each other;

[0091] Alternatively, multiple rows of second electrode structures 602 located in the same row of touch units 5 are used to access the same touch signal, and multiple columns of first electrode structures 601 located in the same column of touch units 5 are used to access the same touch signal.

[0092] In a specific implementation, for a solution in which multiple rows of second electrode structures 602 located in the same row of touch units 5 are electrically connected to each other and multiple columns of first electrode structures 601 located in the same column of touch units 5 are electrically connected to each other, it is possible to enable multiple rows of second electrode structures 602 located in the same row of touch units 5 to access the same touch signal and multiple columns of first electrode structures 601 located in the same column of touch units 5 to access the same touch signal.

[0093] In a specific implementation, if the multiple rows of second electrode structures 602 located in the same row of touch units 5 are not electrically connected to each other, and the multiple columns of first electrode structures 601 located in the same column of touch units 5 are not electrically connected to each other, it can still be set as follows: the multiple rows of second electrode structures 602 located in the same row of touch units 5 are connected to the same touch signal, so that the multiple columns of first electrode structures 601 located in the same column of touch units 5 are connected to the same touch signal.

[0094] In some embodiments, as shown in FIG1 , the touch display panel 1 includes a display area AA and a peripheral area NA surrounding the display area AA; the touch unit 5 is located in the display area AA;

[0095] The touch display panel 1 also includes: multiple binding electrodes 8 located in the peripheral area NA, and multiple touch signal lines 7; the touch signal line 7 extends from the display area AA to the peripheral area NA, one end of the touch signal line 7 is electrically connected to the touch unit 5, and the other end of the touch signal line 7 is electrically connected to the binding electrode 8.

[0096] In a specific implementation, the binding electrode is used to bind to the driving chip.

[0097] In some embodiments, as shown in Figure 1, the multiple touch signal lines 7 include multiple first touch signal lines 701 and multiple second touch signal lines 702; the first touch signal lines 701 are electrically connected to the multiple columns of first electrode structures 601 within a column of touch units 5, and the second touch signal lines 702 are electrically connected to the multiple rows of second electrode structures 602 within a row of touch units 5.

[0098] In some embodiments, as shown in FIG. 1 , two ends of a row of touch units 5 are electrically connected to two second touch signal lines 702 , respectively; and one end of a column of touch units 5 close to the binding electrode 8 is electrically connected to the first touch signal line 701 .

[0099] In some embodiments, the display area includes a plurality of sub-pixels; the plurality of sub-pixels include, for example, a plurality of red sub-pixels, a plurality of blue sub-pixels, and a plurality of green sub-pixels.

[0100] In some embodiments, as shown in FIG3 , the display substrate 3 specifically includes: a base substrate 301, a driving circuit layer 303 located on one side of the base substrate 301, a pixel definition layer 305 and a plurality of light-emitting devices 304 located on the side of the driving circuit layer 303 away from the base substrate 301, and an encapsulation layer 302 located on the side of the light-emitting device 304 away from the base substrate; wherein the light-emitting devices 304 correspond one-to-one to the sub-pixels.

[0101] In some embodiments, as shown in Figure 3, the light-emitting device 304 includes an anode 3041, a light-emitting functional layer 3042, and a cathode 3043 that are stacked together. The pixel definition layer 305 includes a plurality of sub-pixel opening areas 3051. The pixel definition layer 305 covers the edge of the anode 3041. The orthographic projection of the sub-pixel opening area 3051 on the substrate 301 falls within the orthographic projection of the anode 3041 on the substrate 301. The light-emitting functional layer 3042 is located on the side of the anode 3041 and the pixel definition layer 305 that is away from the substrate 301. The cathode 3043 is located on the side of the light-emitting functional layer 3042 that is away from the substrate 301.

[0102] 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.

[0103] In some embodiments, as shown in FIG3 , the driver circuit layer 303 includes a pixel driver circuit that corresponds one-to-one with the light-emitting device 304 and drives the light-emitting device 304 to emit light. The pixel driver circuit includes, for example, a thin-film transistor 3031 and a capacitor 3032. It should be noted that FIG3 only shows one thin-film transistor 3031 and one capacitor 3032. In specific implementations, the pixel driver circuit may also include a larger number of thin-film transistors and capacitors.

[0104] It should be noted that FIG3 illustrates a top-gate thin-film transistor 3031, where the gate G is located on the side of the active layer 30311 facing away from the base substrate 301. A first electrode 30321 of the capacitor 3032 is provided on the same layer as the gate G, and a second electrode 30322 of the capacitor 3032 is located between the film layer containing the gate G and the film layers containing the source S and drain D. The display substrate 3 further includes: a first buffer layer 3033 located between the base substrate 301 and the active layer 30311; a first gate insulating layer 3034 located between the gate G and the active layer 30311; a second gate insulating layer 3035 located between the first electrode 30321 and the second electrode 30322; an interlayer insulating layer 3036 located between the second electrode 30322 and the source S and drain D; and a first planarization layer 306 located between the source S and drain D and the anode 3041.

[0105] In some embodiments, the anode is connected to the drain through a via hole penetrating the first planarization layer.

[0106] Alternatively, in some embodiments, as shown in FIG3 , the display substrate 3 further includes a switching electrode 3039 located between the source electrode S, the drain electrode D, and the anode 3041, a passivation layer 3037 located between the source electrode S, the drain electrode D, and the switching electrode 3039, and a second planarization layer 3038 located between the passivation layer 3037 and the switching electrode 3039. The anode 3041 is connected to the switching electrode 3039 via a via hole penetrating the first planarization layer 306, and the switching electrode 3039 is connected to the drain electrode D via a via hole penetrating the second planarization layer 3038 and the passivation layer 3037.

[0107] In some embodiments, as shown in Figures 4 to 6 , the multi-layer touch conductive layer 4 includes a first touch conductive layer 4-1 and a second touch conductive layer 4-2; the second touch conductive layer 4-2 is located on a side of the first touch conductive layer 4-1 facing away from the display substrate 3. For example, the bridging electrode 6012 is located on the first touch conductive layer 4-1, and the first sub-electrode 6011 and the second sub-electrode 6021 are located on the second touch conductive layer 4-2.

[0108] It should be noted that Fig. 5 is a cross-sectional view along line EE' in Fig. 4, and Fig. 6 is a cross-sectional view along line FF' in Fig. 4. The film layer between the base substrate 301 and the encapsulation layer 302 is omitted in Figs. 5 and 6.

[0109] In some embodiments, as shown in FIG5 and FIG6 , the touch display panel 3 further includes: a second buffer layer 10 located between the first touch conductive layer 4-1 and the encapsulation layer 302, a touch insulating layer 12 located between the first touch conductive layer 4-1 and the second touch conductive layer 4-2, and a protective layer 11 located on a side of the second touch conductive layer 4-2 facing away from the base substrate 301;

[0110] The first sub-electrode 6011 is electrically connected to the bridge electrode 6012 through a via hole 13 penetrating the touch insulating layer 12 .

[0111] 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.

[0112] In some embodiments, as shown in FIG. 4 , the touch conductive layer 4 includes a metal grid structure 401 formed by interweaving a plurality of metal wires 4011 .

[0113] In some embodiments, as shown in FIG4 , the metal grid structure 401 is formed by interweaving a plurality of metal wires 4011 so that the metal grid structure 401 includes a plurality of grids 9, that is, the grid 9 is a polygon composed of a plurality of metal wires, or in other words, the metal grid structure 401 is formed by repeatedly and continuously setting up grids 9. As shown in FIG2 , the shape of the grid 9 surrounded by the metal wires 4011 is a rectangle. Alternatively, the shape of the grid surrounded by the metal wires can be a rhombus, a triangle, a hexagon, etc., or the shape of the grid 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 grid 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 grid pattern surrounded by the metal wires can be a regular shape or an irregular shape, and the edges of the grid can be straight lines or curves, which are not limited in the embodiments of the present disclosure. The edge of the metal grid structure can also include an incomplete grid pattern.

[0114] In a specific implementation, as shown in FIG4 , a plurality of cutouts 4012 may be provided on the grid 9. For portions located on the same touch conductive layer 4 and requiring mutual insulation, for example, when the grid 9 of the first sub-electrode 6011 and the grid 9 of the second sub-electrode 6021 are located on the same layer, the cutouts 4012 are provided in a pattern of the grid 9 provided on the entire surface to achieve isolation between the grid 9 of the first sub-electrode 6011 and the grid 9 of the second sub-electrode 6021.

[0115] The touch electrodes and touch signal lines provided in the disclosed embodiments include a metal mesh structure. The metal mesh structure of the touch conductive layer has advantages such as low resistance, thinness, and fast response speed. This can improve the sensitivity and accuracy of touch recognition. Furthermore, by providing cutouts 4012 in the entire mesh 9 pattern, the mesh 9 of the first sub-electrode 6011 is isolated from the mesh 9 of the second sub-electrode 6021, thereby improving the shadow elimination effect of the metal lines in the off state.

[0116] In some embodiments, as shown in FIG4 , the orthographic projection of the sub-pixel opening area 3051 on the substrate falls within the orthographic projection of the grid 9 on the substrate 301. That is, the orthographic projection of the metal line 4011 on the substrate does not overlap with the orthographic projection of the sub-pixel opening area 3051 on the substrate. This prevents the metal line 4011 from affecting the normal display of the display substrate.

[0117] In some embodiments, as shown in FIG2 and FIG4 , the outline of the touch sub-unit 501 is in the shape of a rectangle;

[0118] The outline of the first sub-electrode 6011 close to the second sub-electrode 6021 and the outline of the second sub-electrode 6021 close to the first sub-electrode 6011 are both broken lines 14 .

[0119] In some embodiments, as shown in Figure 4, when a cutout 4012 is set in the grid 9 to achieve isolation of the grid 9 of the first sub-electrode 6011 and the grid 9 of the second sub-electrode 6021, the connecting line at the cutout 4012 is the outline of the first sub-electrode 6011 close to the second sub-electrode 6021 and the outline of the second sub-electrode 6021 close to the first sub-electrode 6011, that is, the connecting line at the cutout 4012 is the broken line 14.

[0120] In some embodiments, as shown in Figures 2 and 4, the outline of the first sub-electrode 6011 close to the second sub-electrode 6021 and the outline of the second sub-electrode 6021 close to the first sub-electrode 6011 both include multiple alternating first line segments 1401 and second line segments 1402, the first line segments 1401 extend along the first direction X, and the second line segments 1402 extend along the second direction Y.

[0121] In some embodiments, the sum of the numbers of first line segments and second line segments included in the fold line is greater than 2. For example, as shown in FIG2 , the sum of the numbers of first line segments 1401 and second line segments 1402 included in the fold line 14 is 8.

[0122] It should be noted that, in the related art, as shown in FIG7 , the shape of the outline of two adjacent first sub-electrodes 6011 is roughly diamond-shaped, and the shape of the outline of two adjacent second sub-electrodes 6021 is roughly diamond-shaped, that is, the outline of the first sub-electrode 6011 close to the second sub-electrode 6021 and the majority of the outline of the second sub-electrode 6021 close to the first sub-electrode 6011 are oblique lines extending along the third direction X' or the fourth direction X", the third direction X' intersects with the fourth direction X", the third direction X' intersects with both the first direction X and the second direction Y, and the fourth direction X" intersects with both the first direction X and the second direction Y. The algorithm coordinates (the triangular position in FIG8 ) calculated by the algorithm for the touch electrode with a diamond outline and the standard coordinates (the circular position in FIG8 ) of the actual touch position of the active stylus are shown in FIG8 . However, the touch display panel provided by the embodiment of the present disclosure has the algorithm coordinates ( The standard coordinates of the actual touch position of the active stylus (the triangular position in FIG9 ) and the circle position in FIG9 are shown in FIG9 . The greater the distance between the triangular position and the circle position, the greater the touch deviation, and the worse the touch accuracy and linearity. Conversely, the worse the touch accuracy and linearity, the better. For the electrode with a diamond outline, the touch deviation is large because the signal amount of the first sub-electrode and the second sub-electrode at different positions of the active stylus tip is relatively different, as shown in FIG8 ; while the touch display panel provided by the embodiment of the present disclosure has a smaller difference between the size of the touch sub-unit and the diameter of the tip of the active stylus, and by setting the outline of the first sub-electrode close to the second sub-electrode and the outline of the second sub-electrode close to the first sub-electrode as multiple broken lines, the difference in the signal amount of the first sub-electrode and the second sub-electrode at different positions of the active stylus tip is further reduced. As shown in FIG9 , the touch deviation is small, and the touch accuracy and linearity can be improved.

[0123] It should be noted that FIG2 illustrates an example in which the sum of the number of first line segments 1401 and second line segments 1402 included in the fold line 14 is 8. The outline of the pattern formed by the two first sub-electrodes 6011 and the outline of the pattern formed by the two second sub-electrodes 6021 are approximately cross-shaped. Of course, when the fold line includes multiple alternating first and second line segments, the first and second sub-electrodes may also have other patterns.

[0124] In some embodiments, as shown in FIG10 , the first sub-electrode 6011 includes a first rectangular region 60111 and a first region 60112 located on one side of the first rectangular region 60111 in the second direction Y;

[0125] The second sub-electrode 6021 includes a second rectangular region 60211 and a second region 60212 located on one side of the second rectangular region 60211 in the first direction X;

[0126] The outline of the pattern formed by the two first areas 60112 located between the two first rectangular areas 60111 in the second direction Y and the two second areas 60212 located between the two second rectangular areas 60211 in the first direction X (ie, the outline of the H1 region) is a rectangle.

[0127] In some embodiments, as shown in FIG. 10 , the width of the H1 region in the second direction Y is equal to the width of the second rectangular area 60211 in the second direction Y.

[0128] In some embodiments, as shown in FIG10 , two adjacent second rectangular areas 60211 located in different touch sub-units 501 form a third rectangular area H2 ; a plurality of first rectangular areas 60111 located between two adjacent rows of second rectangular areas 60211 form a fourth rectangular area H3 .

[0129] In a specific implementation, as shown in Figure 4 , the orthographic projections of the metal lines 4011 in the first touch conductive layer 4-1 and the metal lines 4011 in the second touch conductive layer 4-2 on the display substrate (not shown) overlap. The orthographic projections of the bridging electrode 6012 and the second sub-electrode 6021 on the display substrate (not shown) overlap in region B. The line width of the metal lines 4011 is consistent across all regions. The meshes 9 in the first touch conductive layer 4-1 and the meshes 9 in the second touch conductive layer 4-2 are consistent in shape, size, and line width of the metal lines 4011.

[0130] In some embodiments, as shown in Figures 11 to 13 , the orthographic projection of the first touch conductive layer 4-1 on the display substrate (not shown) and the orthographic projection of the second touch conductive layer 4-2 on the display substrate (not shown) have an overlapping region B. That is, the orthographic projection of the bridging electrode 6012 on the display substrate (not shown) and the orthographic projection of the second sub-electrode 6021 on the display substrate (not shown) have an overlapping region B.

[0131] In some embodiments, as shown in FIG14 , the line width h3 of the metal line 4011 of the first touch conductive layer 4-1 (the metal line 4011 of the bridging electrode 6012) in the overlapping area B is smaller than the line width h4 of the metal line 4011 of the first touch conductive layer 4-1 (the metal line 4011 of the bridging electrode 6012) in the remaining area; and the line width h5 of the metal line 4011 of the second touch conductive layer 4-2 (the metal line 4011 of the second sub-electrode 6021) in the overlapping area is smaller than the line width h6 of the metal line 4011 of the second touch conductive layer 4-2 (the metal line 4011 of the second sub-electrode 6021) in the remaining area.

[0132] The touch display panel provided by the embodiment of the present disclosure is equivalent to reducing the line width of the metal line in the overlapping area, thereby reducing the parasitic capacitance between the two layers of metal lines in the overlapping area and improving the touch accuracy.

[0133] In some embodiments, h3 = h4 - 1 micron, and h5 = h6 - 1 micron.

[0134] In related technologies, as the screen size of large-scale touch display panels increases, the resistance and capacitance of the touch electrode channels also increase, leading to increased impedance and RC loading. The active stylus transmits signal through the coupling capacitance between the stylus and the touch electrode, passing through the RC loading of the touch display panel before reaching the operational amplifier of the driver chip (IC) and outputting it. This increased RC loading leads to increased signal attenuation from the active stylus, severely hindering its application in medium- and large-sized touch display products.

[0135] In some embodiments, as shown in FIG. 11 to FIG. 13 , the bridging electrode 6012 includes m metal wires 4011 arranged along the first direction X; m is an integer greater than 2; and / or,

[0136] In the area where the orthographic projection of the bridging electrode 6012 on the display substrate 3 overlaps with the orthographic projection of the second sub-electrode 6021 on the display substrate 3 , the second sub-electrode 6021 includes k metal wires 4011 arranged along the second direction Y, where k is an integer greater than 2.

[0137] In some embodiments, as shown in FIG. 11 to FIG. 13 , the touch conductive layer 4 includes metal lines 4011 extending along a first direction X and metal lines 4011 extending along a second direction Y.

[0138] In the touch display panel provided by the embodiment of the present disclosure, m is greater than 2, and / or k is greater than 2, thereby reducing the impedance of the first electrode structure and the second electrode structure.

[0139] In some embodiments, in FIG. 11 , m=4, k=2.

[0140] In some embodiments, in FIG12 , m=2, k=4.

[0141] In some embodiments, in FIG13 , m=4, k=4.

[0142] In a specific implementation, when m and k are both greater than 2, compared with the case where either of them is less than or equal to 2, the impedance of the two second sub-electrodes in the touch sub-unit can be further reduced, the active stylus signal attenuation can be reduced, and the touch signal quantity can be increased.

[0143] Next, we'll illustrate how increasing the number of metal lines in the overlapping area can reduce the impedance of the first and second electrode structures. As shown in Table 1, when m = 2 and k = 2, the impedance of the first electrode structure is 6.67 ohms (Ω), and the impedance of the second electrode structure is 4.83 Ω. When m = 4 and k = 4, the impedance of the first electrode structure is 4.72 Ω, a 29% reduction compared to when m = 2 and k = 2. The impedance of the second electrode structure is 3.14 Ω, a 35% reduction compared to when m = 2.

[0144] Table 1

[0145] In some embodiments, as shown in FIG. 11 to FIG. 13 , the orthographic projection of the sub-pixel opening region 3051 on the display substrate (not shown) is a rectangle, with one pair of sides of the rectangle parallel to the first direction X, and the other pair of sides parallel to the second direction Y. That is, the sides of the sub-pixel opening region 3051 are parallel to the metal line 4011 .

[0146] In a specific implementation, as shown in Figures 11 to 13, the plurality of opening areas 3014 include: a red sub-pixel opening area P2 corresponding to a red sub-pixel, a blue sub-pixel opening area P3 corresponding to a blue sub-pixel, and a green sub-pixel opening area P1 corresponding to a green sub-pixel. The green sub-pixel opening area P1 and the red sub-pixel opening area P2 are located in the same row, while the blue sub-pixel opening area P3, the green sub-pixel opening area P1, and the red sub-pixel opening area P2 are located in different rows. The blue sub-pixel opening area P3 is staggered relative to the green sub-pixel opening area P1 and the red sub-pixel opening area P2. For example, a pixel includes a green sub-pixel opening area P1, a red sub-pixel opening area P2, and a blue sub-pixel opening area P3.

[0147] Alternatively, in some embodiments, as shown in FIG15 , the touch conductive layer 4 includes a metal line 4011 whose extension direction intersects both the first direction X and the second direction Y;

[0148] As shown in Figures 15 and 16 , the orthographic projection of the metal wires 4011 of the bridging electrode 6012 on the display substrate 3 forms a rectangle. Thus, the number of metal wires in the bridging electrode remains at four, which can reduce the impedance of the first electrode structure. Furthermore, when the four metal wires of the bridging electrode form a rectangle, the bridging electrode and the first sub-electrode overlap in only four locations within a touch sub-unit. This reduces the overlapping area between the bridging electrode and the first sub-electrode, lowering the parasitic capacitance between them and improving touch accuracy.

[0149] In a specific implementation, as shown in FIG15 , the sub-pixel opening area 3051 is in the shape of a rectangle, and the sides of the rectangle are parallel to the metal line. A plurality of sub-pixel opening areas 3051 are arranged in an array along the third direction X' and the fourth direction X". The third direction X' intersects with the fourth direction X", the third direction X' intersects with both the first direction X and the second direction Y, and the fourth direction X" intersects with both the first direction X and the second direction Y. A row of sub-pixel opening areas 3051 arranged along the third direction X' includes alternating green sub-pixel opening areas P1 and red sub-pixel opening areas P2. A row of sub-pixel opening areas 3051 adjacent to the row of sub-pixel opening areas 3051 includes alternating blue sub-pixel opening areas P3 and green sub-pixel opening areas P1. For example, a pixel includes two green sub-pixel opening areas P1, one red sub-pixel opening area P2, and a blue sub-pixel opening area P3.

[0150] In the related art, as shown in Figure 17, the touch conductive layer 4 where the first sub-electrode 6011 and the second sub-electrode 6021 are located further includes: a dummy electrode dm; the dummy electrode dm is disconnected from the first sub-electrode 6011 and the second sub-electrode 6021; at least some of the dummy electrodes dm1~dm16 are located between two adjacent rows of first sub-electrodes 6011, and / or between two adjacent rows of second sub-electrodes 6012.

[0151] In a specific implementation, the dummy electrodes also include metal wires. The provision of the dummy electrodes can make the touch conductive layer include a metal grid structure in any area of ​​the display area, thereby improving display uniformity.

[0152] However, because the multiple rows of second electrode structures within the same row of touch cells are used to receive the same touch signal, and the multiple columns of first electrode structures within the same column of touch cells are used to receive the same touch signal, as shown in FIG18 , the multiple rows of second electrode structures 602 or the multiple columns of first electrode structures 601 (represented by a line segment in the figure) within the same row of touch cells (not shown) are electrically connected only in the peripheral area NA. That is, the multiple rows of second electrode structures 602 and the multiple columns of first electrode structures 601 are independent of each other in the display area AA, but are connected to the same touch signal line in the peripheral area NA. Therefore, if a path of one row of second electrode structures 602 in the display area AA is partially damaged due to process or reliability conditions (e.g., at Q1 in FIG18 ), the corresponding path will float, which will cause abnormal capacitance of the entire channel and affect touch accuracy.

[0153] In some embodiments, as shown in FIG19 , in a touch unit 5 , two adjacent rows of second electrode structures 602 are electrically connected, and are also electrically connected at the edge of the touch unit 5 ; and two adjacent columns of first electrode structures 601 are electrically connected. This is equivalent to the metal wires in the dm1 to dm4 regions between two adjacent rows of second electrode structures 602 in FIG17 being connected to the metal wires of the second electrode structures 602 , and the metal wires between two adjacent columns of first electrode structures 601 in FIG17 being electrically connected to the first electrode structures 601 .

[0154] In this way, in the display area, the paths of the first electrode structure are no longer independently set, and the paths of the second electrode structure are no longer independently set. Even if, as shown in Figure 20, the path of the first electrode structure 601 or the path of the second electrode structure 602 is locally damaged Q2 due to process or reliability conditions, the path of the first electrode structure 601 or the path of the second electrode structure 602 will not float, which can improve the yield and reliability of the touch display panel.

[0155] In some embodiments, as shown in FIG. 21 , the dummy electrode dm is further located between the first sub-electrode 6011 and the second sub-electrode 6021 .

[0156] It should be noted that, as shown in Table 2, when no dummy electrode is provided between the first and second sub-electrodes, the parasitic capacitance between them is 1.2 pF. When a dummy electrode is provided between the first and second sub-electrodes, the parasitic capacitance between them is 0.8 pF. In other words, the touch display panel provided in the present embodiment can reduce the parasitic capacitance between the first and second sub-electrodes 6011 and 6021 by providing dummy electrodes therebetween.

[0157] Table 2

[0158] In some embodiments, as shown in FIG22 , the distance h7 between the first sub-electrode 6011 and the second sub-electrode 6021 is greater than or equal to 40 micrometers and less than or equal to 80 micrometers. This can further reduce the parasitic capacitance between the two, increase the touch signal intensity, and thus improve touch accuracy.

[0159] An embodiment of the present disclosure provides a display device, which includes the touch display panel provided by the embodiment of the present disclosure.

[0160] The display device provided in the embodiments of the present disclosure is any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system. Other essential components of the display device are well understood by those skilled in the art and are not described here in detail, nor should they be construed as limitations of the present disclosure. The implementation of the display device can be referenced to the above-described display panel embodiments, and any repetitive details will not be repeated.

[0161] In summary, the touch display panel and display device provided by the embodiments of the present disclosure are: That is, the difference between the size of the touch subunit and the tip diameter of the active stylus is small, which can avoid sudden changes in the signal quantity when the active stylus passes through different areas, avoid large deviations between the actually sensed touch position and the actual touch position, and improve touch accuracy and linearity.

[0162] 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.

[0163] 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 is based on an active stylus for touch, and the touch display panel includes: A display substrate; A multi-layer touch conductive layer is located on the display side of the display substrate; the orthographic projection of the multi-layer touch conductive layer on the display substrate is divided into: a plurality of touch units arranged in an array along a first direction and a second direction; the touch units include a plurality of touch sub-units arranged in n rows by n columns, where n is an integer greater than or equal to 2; the first direction intersects the second direction, the touch sub-units in each row extend in the first direction, and the touch sub-units in each column extend in the second direction; a width h1 of the touch sub-unit in the first direction, a width h2 of the touch sub-unit in the second direction, and a tip diameter D of the active stylus satisfy the following conditions:

2. The touch display panel according to claim 1, wherein: 1 mm ≤ D ≤ 1.2 mm; n = 3, 1.2 ≤ h1 ≤ 1.4, 1.2 ≤ h2 ≤ 1.

4.

3. The touch display panel according to claim 1, wherein: 1 mm ≤ D ≤ 1.2 mm; n = 4, 0.9 ≤ h1 ≤ 1.05, 0.9 ≤ h2 ≤ 1.

05.

4. The touch display panel according to claim 1, wherein: 1.2 mm < D ≤ 1.5 mm; n = 3, 1.2 ≤ h1 ≤ 1.4, 1.2 ≤ h2 ≤ 1.

4.

5. The touch display panel according to claim 1, wherein: 1.2 mm < D ≤ 1.5 mm; n = 2, 1.9 ≤ h1 ≤ 2.1, 1.9 ≤ h2 ≤ 2.

1.

6. The touch display panel according to claim 1, wherein: The touch conductive layer includes: a metal grid structure formed by interweaving multiple metal wires; The multi-layer touch conductive layer includes a first touch conductive layer and a second touch conductive layer; the orthographic projection of the first touch conductive layer on the display substrate and the orthographic projection of the second touch conductive layer on the display substrate have an overlapping area; The line width of the metal wires of the first touch conductive layer in the overlapping area is smaller than the line width of the metal wires of the first touch conductive layer in the remaining areas; The line width of the metal wires of the second touch conductive layer in the overlapping area is smaller than the line width of the metal wires of the second touch conductive layer in the remaining areas.

7. The touch display panel according to any one of claims 1 to 6, wherein: The touch sub-unit includes: a first electrode structure and a second electrode structure arranged crosswise; the first electrode structure includes two first sub-electrodes arranged along the second direction, and a bridging electrode electrically connecting the two first sub-electrodes; the second electrode structure includes two second sub-electrodes arranged along the first direction; The first sub-electrode and the second sub-electrode are located in the same touch conductive layer, and the bridging electrode and the first sub-electrode as well as the second sub-electrode are located in different touch conductive layers; The orthographic projection of the bridging electrode on the display substrate and the orthographic projection of the second sub-electrode on the display substrate have an overlap.

8. The touch display panel according to claim 7, wherein: The touch unit includes n rows of the second electrode structures and n columns of the first electrode structures; The multiple rows of the second electrode structures located in the same row of the touch unit are electrically connected to each other, and the multiple columns of the first electrode structures located in the same column of the touch unit are electrically connected to each other; Alternatively, the multiple rows of the second electrode structures located in the same row of the touch unit are used to access the same touch signal, and the multiple columns of the first electrode structures located in the same column of the touch unit are used to access the same touch signal.

9. The touch display panel according to claim 7, wherein: The touch conductive layer includes metal wires; The bridging electrode includes m metal wires arranged along the first direction; m is an integer greater than 2.

10. The touch display panel according to claim 7, wherein: The touch conductive layer includes metal wires; In the area where the orthographic projection of the bridging electrode on the display substrate and the orthographic projection of the second sub-electrode on the display substrate have an overlap, the second sub-electrode includes k metal wires arranged along the second direction; k is an integer greater than 2.

11. The touch display panel according to claim 7, wherein: The touch conductive layer includes metal wires whose extending direction intersects both the first direction and the second direction; The shape enclosed by the orthographic projection of the metal wires of the bridging electrode on the display substrate is a rectangle.

12. The touch display panel according to claim 7, wherein: A distance between the first sub-electrode and the second sub-electrode is greater than or equal to 40 micrometers and less than or equal to 80 micrometers.

13. The touch display panel according to claim 7, wherein: The outline of the touch sub-unit is in the shape of a rectangle; An outline of the first sub-electrode close to the second sub-electrode and an outline of the second sub-electrode close to the first sub-electrode are both broken lines.

14. The touch display panel according to claim 13, wherein: The outline of the first sub-electrode close to the second sub-electrode and the outline of the second sub-electrode close to the first sub-electrode both include multiple alternating first line segments and second line segments, the first line segments extend along the first direction, and the second line segments extend along the second direction.

15. The touch display panel according to claim 13 or 14, wherein: The first sub-electrode includes a first rectangular area and a first area located on one side of the first rectangular area in the second direction; The second sub-electrode includes a second rectangular area and a second area located on one side of the second rectangular area in the first direction; The outline of the pattern formed by two first areas located between two first rectangular areas in the second direction and two second areas located between two second rectangular areas in the first direction is a rectangle.

16. A display device, wherein: The display device includes the touch display panel according to any one of claims 1 to 15.

Images