Touch substrate and display panel

Abstract

The present invention provides a touch control substrate and a display panel. The touch control substrate includes a plurality of touch control units, each of which has a first electrode and a second electrode. The first electrode includes a first main electrode and a plurality of first branch electrodes. The first main electrode is parallel to a first direction. The first branch electrodes are arranged on both sides of the first main electrode. Therefore, the first branch electrodes extend outward with the first main electrode as the center and form a radial structure. The second electrode includes a second main electrode and a plurality of first branch electrodes. The second main electrode is parallel to a second direction. The second branch electrodes are arranged on both sides of the second main electrode. The first branch electrodes and the second branch electrodes are alternately arranged to form an interlocking structure.

Description

Technical Field

[0001] The present invention relates to the field of display devices, and in particular to a touch control substrate and a display panel. Background Art

[0002] Capacitive touch screens are widely used in various electronic interactive scene devices due to their high durability, long life, and support for multi-touch functions. Capacitive touch screens detect the specific location of a finger touch by detecting the change in capacitance at the finger touch location. Therefore, when the capacitance change caused by touch is small, traditional capacitive touch screens may not be able to accurately detect whether there is a touch input. Since the structural design of the touch screen is a very important factor in detecting the capacitance change, it is very necessary to develop a touch screen design that can detect smaller capacitance changes.

[0003] At present, for flexible AMOLED (Active-Matrix Organic Light-Emitting Diode) display screens, the touch electrode pattern usually needs to be directly made on the upper surface of the thin film packaging layer. However, since the packaging layer is relatively thin (usually about 10um thick), the distance between the touch electrode and the cathode is small, resulting in a large parasitic capacitance between TX (driving electrode) / RX (sensing electrode) and the cathode, which in turn leads to a large RC delay and reduces the touch sensitivity. In addition, the material of the touch electrode in the current flexible AMOLED display screen is usually a hollow metal mesh material, and its conductive area is relatively small compared to the touch electrode of the traditional whole transparent ITO material. The actual effective conductive electrode area is smaller, so the mutual capacitance induction between the touch electrodes TX and RX is very small, resulting in a smaller capacitance change caused by a finger touch, which is not easily detected by the touch chip. Summary of the invention

[0004] The object of the present invention is to provide a touch substrate and a display panel to solve the problem in the prior art that the parasitic capacitance between the touch electrode and the cathode is large, thereby reducing the sensitivity and accuracy of the touch substrate.

[0005] To achieve the above object, the present invention provides a touch control substrate, the touch control substrate comprising a plurality of touch control units, each of the touch control units having a first electrode and a second electrode, the first electrode extending along a first direction, and the second electrode extending along a second direction perpendicular to the first direction.

[0006] The first electrode includes a first trunk electrode and a plurality of first branch electrodes. The first trunk electrode is parallel to the first direction. The first branch electrodes are arranged on both sides of the first trunk electrode. Therefore, the first branch electrodes extend outwards with the first trunk electrode as the center, and form a radial structure.

[0007] The second electrode includes a second trunk electrode and a plurality of first branch electrodes. The second trunk electrode is parallel to the second direction. The second branch electrodes are arranged on both sides of the second trunk electrode. The first branch electrodes and the second branch electrodes are alternately arranged to form an interlocking structure.

[0008] Further, the first electrode further comprises a first stem electrode, the first stem electrode is arranged on both sides of the first main stem electrode, a first angle is formed between the first main stem electrode and the first stem electrode, and the angle of the first angle is less than 90°. The first branch electrode is arranged on a side of the first stem electrode away from the first main stem electrode, and a second angle is formed between the first branch electrode and the first main stem electrode, and the second angle is less than 90°.

[0009] Furthermore, the first primary stem electrode includes at least two first sub-secondary stem electrodes, and each two of the first sub-secondary stem electrodes are connected to each other and surround an opening with the first stem electrode. At least three first branch stem electrodes are arranged on the side of each first sub-secondary stem electrode away from the opening, and the distance between two adjacent first branch stem electrodes is equal. The farther the first branch stem electrode is from the first main stem electrode, the longer the length of the first branch stem electrode is.

[0010] Furthermore, the touch control unit further has a first virtual electrode, which is disposed in the opening and electrically insulated from the first electrode.

[0011] Furthermore, each of the first branch electrodes is provided with a second branch electrode on both sides, and the farther the second branch electrode is from the first main electrode, the longer the second branch electrode is.

[0012] Furthermore, there is a gap between the first branch electrode and the second branch electrode. The touch control unit further comprises a second virtual electrode, which is arranged in the gap and is electrically insulated from the first electrode and the second electrode.

[0013] Furthermore, the first trunk electrode includes two first sub-trunk electrodes, and the first sub-trunk electrodes are respectively located on both sides of the second trunk electrode and are bridged by at least one conductive bridge.

[0014] Furthermore, the second electrode further comprises a second stem electrode, the second stem electrode is arranged on both sides of the second main stem electrode and is parallel to the second main stem electrode. A plurality of the first branch electrodes are arranged on one side of the second stem electrode close to the first branch electrode.

[0015] Furthermore, the touch control unit further includes a third virtual electrode, which is disposed on a side of the second electrode away from the first trunk electrode and is electrically insulated from the second electrode.

[0016] Furthermore, the minimum width of the branch electrodes in the first electrode and the second electrode is greater than the size of two sub-pixels.

[0017] Furthermore, the first electrode and the second electrode are made of a metal grid or a transparent conductive material.

[0018] Further, the touch control substrate comprises a plurality of first electrode groups and a plurality of second electrode groups. The first electrode groups are arranged along the second direction and extend along the first direction. The second electrode groups are arranged along the first direction and extend along the second direction.

[0019] The touch control unit array is arranged in the touch control substrate. In the first direction, the first electrodes in two adjacent touch control units are electrically connected to each other, and a plurality of the first electrodes electrically connected to each other are combined into a first electrode group. In the second direction, the second electrodes in two adjacent touch control units are electrically connected to each other, and a plurality of the second electrodes electrically connected to each other are combined into a second electrode group.

[0020] The present invention further provides a display panel, which includes the touch control substrate as described above.

[0021] The advantages of the present invention are: a touch control substrate and a display panel of the present invention make the distribution of the mutual capacitance electric field in each touch control unit more uniform through the radial branch electrode distribution structure, and increase the bite length between the first electrode and the second electrode in a limited space, greatly increase the area facing each other between the first electrode and the second electrode, and then increase the change in the parasitic capacitance between the first electrode and the second electrode after the touch occurs, effectively improving the sensitivity and accuracy of the touch control substrate in identifying the touch position. At the same time, the first branch electrode and the second branch electrode that bite each other can reduce the impedance in the first electrode and the second electrode, thereby reducing the RC delay in the touch control unit and improving the reporting rate of the touch control substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 is a schematic diagram of the structure of a touch substrate in an embodiment of the present invention;

[0024] Figure 2 is a plan view schematic diagram of a touch control unit in an embodiment of the present invention;

[0025] Figure 3 is an enlarged schematic diagram of the first area in the touch unit in an embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the layered structure of the conductive bridge in an embodiment of the present invention;

[0027] Figure 5 is a plan view schematically showing four touch control units arranged in an array in an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the layers between the metal wiring and the light-emitting device in an embodiment of the present invention;

[0029] Figure 7 is a plan view schematic diagram of a metal mesh structure in an embodiment of the present invention;

[0030] Figure 8 FIG. 4 is a schematic diagram of a layered structure of a display panel in an embodiment of the present invention.

[0031] The components in the figure are shown as follows:

[0032] first direction x; second direction y;

[0033] Touch control substrate 1; Touch control area 1A;

[0034] Non-touch area 1B; First electrode group 11;

[0035] A second electrode group 12; A driving chip 13;

[0036] Signal wiring 14; Touch control unit 15;

[0037] A first center line L1; A second center line L2;

[0038] The first zone 15A; The second zone 15B;

[0039] The third zone is 15C; The fourth zone is 15D;

[0040] A first electrode 100; A first trunk electrode 110;

[0041] A first sub-trunk electrode 111; A conductive bridge 112;

[0042] First dry electrode 120; First sub-dry electrode 121;

[0043] A first dry electrode 130; an opening 140;

[0044] A second electrode 200; A second trunk electrode 210;

[0045] A second dry electrode 220; A second dry electrode 230;

[0046] Gap 240; First virtual electrode 310;

[0047] A second virtual electrode 320; A third virtual electrode 330;

[0048] Metal trace 400; fracture 410;

[0049] Insulating layer 500; Display panel 1000;

[0050] Substrate layer 2; Array substrate 3;

[0051] Light-emitting layer 4; Light-emitting device 41;

[0052] Thin film encapsulation layer 5; Polarizer 6;

[0053] Cover plate 7. DETAILED DESCRIPTION

[0054] The preferred embodiments of the present invention are described below with reference to the drawings in the specification to prove that the present invention can be implemented. The embodiments of the invention can fully introduce the present invention to those skilled in the art, making its technical content clearer and easier to understand. The present invention can be embodied through many different forms of embodiments of the invention, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0055] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[0056] In addition, the following descriptions of the various embodiments of the invention are made with reference to the attached diagrams to illustrate specific embodiments of the invention that the present invention can be implemented with. The directional terms mentioned in the present invention, such as "upper", "lower", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer description and understanding of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0057] When some components are described as being "on" another component, the component may be directly placed on the other component; there may also be an intermediate component on which the component is placed, and the intermediate component is placed on the other component. When a component is described as being "mounted on" or "connected to" another component, the two may be understood to be directly "mounted on" or "connected", or one component may be indirectly "mounted on" or "connected to" another component via an intermediate component.

[0058] In an embodiment of the present invention, a touch control substrate 1 is provided. Figure 1 As shown, the touch substrate 1 has a touch area 1A and a non-touch area 1B connected to the touch area 1A.

[0059] In the touch control area 1A, the touch control substrate 1 includes a plurality of first electrode groups 11 and a plurality of second electrode groups 12. The first electrode groups 11 extend along a first direction x and are arranged along a second direction y, and each first electrode group 11 includes a plurality of first electrodes 100 electrically connected to each other. The second electrode groups 12 extend along a second direction y and are arranged along the first direction x, and each second electrode group 12 includes a plurality of second electrodes 200 electrically connected to each other. The first direction x is perpendicular to the second direction y, so that the first electrode group 11 intersects with the second electrode group 12, and the first electrode group 11 and the second electrode group 12 are insulated from each other.

[0060] In the non-touch area 1B, the touch substrate 1 includes a plurality of signal traces 14, and the signal traces 14 are used to electrically connect the first electrode group 11 and the second electrode group 12 to the driver chip 13, so as to transmit the capacitance data generated in the touch area 1A to the driver chip 13 for processing, thereby generating a touch signal. Each signal trace 14 is electrically connected to one of the first electrode groups 11 or one of the second electrode groups 12, so as to transmit the capacitance data generated in each row and each column of the electrode group to the driver chip 13.

[0061] In the intersecting first electrode group 11 and the second electrode group 12, the first electrode 100 at the intersecting position and the corresponding cross-arranged second electrode 200 form a touch unit 15. The intersection between the plurality of first electrode groups 11 and the plurality of second electrode groups 12 forms a plurality of touch units 15, and the plurality of touch units 15 are arranged in an array in the touch substrate 1 along the first direction x and the second direction y.

[0062] like Figure 2As shown, each touch unit 15 has the first electrode 100 and the second electrode 200. The touch unit 15 is an axisymmetric structure and a centrosymmetric structure, and has a symmetry center and a first center line L1 and a second center line L2 passing through the symmetry center and perpendicular to each other. The first center line L1 is parallel to the first direction x, and the second center line L2 is parallel to the second direction y. The first electrode 100 and the second electrode 200 are both symmetrical about the first center line L1, and the first electrode 100 and the second electrode 200 are both symmetrical about the second center line L2.

[0063] According to the first center line L1 and the second center line L2, the touch unit 15 is divided into four array-arranged repeating areas, and the repeating areas are the first area 15A, the second area 15B, the third area 15C and the fourth area 15D. In the first direction x, the first area 15A and the fourth area 15D and the second area 15B and the third area 15C are axially symmetrical with the first center line L1 as the axis. In the second direction y, the first area 15A and the second area 15B and the third area 15C and the fourth area 15D are axially symmetrical with the second center line L2 as the axis. The first area 15A and the third area 15C and the second area 15B and the fourth area 15D are centrally symmetrical with the symmetry center as the center point.

[0064] like Figure 2 As shown, the first electrode 100 includes a first main electrode 110, four first sub-main electrodes 120 and a plurality of first branch electrodes 130. The first main electrode 110 extends from the first area 15A and the second area 15B to the third area 15C and the fourth area 15D along the first direction x, and corresponds to the first center line L1, that is, the touch unit 15 is a left-right axisymmetric structure with the first main electrode 110 as the axis.

[0065] The first primary dry electrodes 120 are disposed on both sides of the first main dry electrode 110, and each repeated region has a first primary dry electrode 120, and each first primary dry electrode 120 includes two first sub-secondary dry electrodes 121. Figure 3As shown, in the first area 15A, one ends of the two first sub-sub-stem electrodes 121 are electrically connected to each other, and the other ends of the two first sub-sub-stem electrodes 121 are electrically connected to the first main electrode 110 respectively, and surround a triangular structure with the first main electrode 110, and the triangular structure has an opening 140. Preferably, the first sub-sub-stem electrodes 121 located in the same repeating area have the same length, so that the triangular structure surrounded is an isosceles triangle structure, and the symmetry axis of the isosceles triangle structure is parallel to the second center line L2.

[0066] like Figure 3 As shown, the first sub-sub-stem electrodes 121 are inclined to the first main electrode 110 and form a first angle, and the first angle is less than 90°. Preferably, the first angle between the first sub-sub-stem electrode 121 and the first main electrode 110 is 45°. Therefore, the triangular structure formed by the first sub-sub-stem electrode 121 and the first main electrode 110 is an isosceles right triangle structure.

[0067] The first branch electrode 130 is disposed on a side of the first primary electrode 120 away from the first primary electrode 110 and is electrically connected to the first primary electrode 120. Each touch control unit 15 also has the first branch electrode 130. Figure 3 As shown, in the first area 15A, each first sub-sub-stem electrode 121 is provided with the first branch stem electrode 130, and the number of the first branch stem electrodes 130 on each first sub-sub-stem electrode 121 is the same. Preferably, each first sub-sub-stem electrode 121 is provided with three first branch stem electrodes 130, and the distance between two adjacent first branch stem electrodes 130 is equal.

[0068] On the same first sub-sub-stem electrode 121, the ends of the first branch electrodes 130 away from the first sub-sub-stem electrode 121 are all located on the same straight line, and the straight line is parallel to the second direction y. Since the first sub-sub-stem electrode 121 is obliquely connected to the first main stem electrode 110, the distances between different positions on the first sub-sub-stem electrode 121 and the straight line are also different, which makes the lengths of the first branch electrodes 130 different. Specifically, the greater the distance between the first branch electrode 130 and the first main stem electrode 110, the longer the length of the first branch electrode 130, that is, the first branch electrode 130 farthest from the first main stem electrode 110 has the longest length, and the first branch electrode 130 closest to the first main stem electrode 110 has the shortest length.

[0069] The first branch electrode 130 is inclined to the first main electrode and forms a second angle, which is greater than 0° and less than 90°. There is a third angle between the first branch electrode 130 and the first sub-sub-stem electrode 121, and the third angle is not equal to 0° or 180°. Preferably, the first angle between the first branch electrode 130 and the first main electrode 110 is 45°, and the third angle between the first branch electrode 130 and the first sub-sub-stem electrode 121 is 90°.

[0070] like Figure 2 As shown, in the second area 15B, the third area 15C and the fourth area 15D, the structure of the first electrode 100 is the same as that in the first area 15A. In addition, according to the principle of geometric symmetry, the first electrode 100 in the second area 15B is axially symmetrical with the first electrode 100 in the first area 15A with the first center line L1 as the axis, the first electrode 100 in the third area 15C is centrally symmetrical with the first electrode 100 in the first area 15A with the symmetry center as the center point, and the first electrode 100 in the fourth area 15D is axially symmetrical with the first electrode 100 in the first area 15A with the second center line L2 as the axis.

[0071] like Figure 2 As shown, the second electrode 200 includes a second main electrode 210, four second main electrodes 220 and a plurality of second branch electrodes 230. The second main electrode 210 extends from the second area 15B and the third area 15C to the first area 15A and the fourth area 15D along the second direction y, and corresponds to the second center line L2, that is, the touch unit 15 is in a vertically symmetrical structure with the second main electrode 210 as the axis.

[0072] The second stem electrode 220 is disposed on both sides of the second main stem electrode 210, and each repeated region has a second stem electrode 220. Figure 3 As shown, in the first area 15A, the second secondary trunk electrode 220 is located at one end of the first branch electrode 130 away from the second trunk electrode 210 , and the second secondary trunk electrode 220 is parallel to the second trunk electrode 210 .

[0073] The second branch electrode 230 is disposed on a side of the second main electrode 210 and the second secondary branch electrode 220 close to the first branch electrode 130. Figure 3As shown, in the first area 15A, the first branch electrodes 130 and the second branch electrodes 230 are alternately arranged, and each first branch electrode 130 has a second branch electrode 230 on both sides. The end of the second branch electrode 230 away from the first stem electrode 120 is connected to the second stem electrode 220 or the second main stem electrode 210, so as to form a half-enclosed structure, and the first branch electrode 130 is surrounded in the half-enclosed structure, but the first branch electrode 130 and the second branch electrode 230 are insulated from each other and have a gap 240. The second branch electrode 230 on the second main stem electrode 210 that is farthest from the first main stem electrode 110 is electrically connected to the second branch electrode 230 on the second stem electrode 220 that is farthest from the first main stem electrode 110, so that the second main stem electrode 210 is electrically connected to the second stem electrode 220.

[0074] Specifically, in the same touch unit 15, the distances between two adjacent second branch electrodes 230 located on the same second trunk electrode 210 or the same second sub-trunk electrode 220 are equal. The second branch electrode 230 is parallel to the first branch electrode 130. There is a fourth angle between the second branch electrode 230 and the second trunk electrode 210, and the angle of the fourth angle is the same as the angle of the first angle. In addition, since the lengths of the first branch electrodes 130 on the same first sub-sub-trunk electrode 121 are different, the lengths of the second branch electrodes 230 on the same second trunk electrode 210 or the same second sub-trunk electrode 220 in the same touch unit 15 are also different, and the length of the second branch electrode 230 also increases with the increase of the distance between it and the first trunk electrode 110, that is, the second branch electrode 230 farthest from the first trunk electrode 110 has the longest length, and the second branch electrode 230 closest to the first trunk electrode 110 has the shortest length.

[0075] like Figure 2 As shown, in the second area 15B, the third area 15C and the fourth area 15D, the structure of the second electrode 200 is the same as that in the first area 15A. In addition, according to the principle of geometric symmetry, the second electrode 200 in the second area 15B is symmetrical with the second electrode 200 in the first area 15A with the first center line L1 as the axis, the second electrode 200 in the third area 15C is symmetrical with the second electrode 200 in the first area 15A with the symmetry center as the center point, and the second electrode 200 in the fourth area 15D is symmetrical with the second electrode 200 in the first area 15A with the second center line L2 as the axis.

[0076] Further, the width of the first branch electrode 130 is smaller than the width of the first main electrode 110 and the first sub-stem electrode 120, the width of the second branch electrode 230 is smaller than the width of the second main electrode 210 and the second sub-stem electrode 220, and the width of the first branch electrode 130 is equal to the width of the second branch electrode 230. In addition, the minimum width of the branch electrodes in the first electrode 100 and the second electrode 200 is greater than the size of two sub-pixels, that is, the minimum width of the first branch electrode 130 and the second branch electrode 230 is greater than the size of two sub-pixels.

[0077] The first electrode 100 and the second electrode 200 are insulated from each other. Figure 2 and Figure 4 As shown, the first electrode 100 and the second electrode 200 are located in the same metal layer, the first trunk electrode 110 includes two first sub-trunk electrodes 111, the two first sub-trunk electrodes 111 are respectively arranged on both sides of the second trunk electrode 210, and the two first sub-trunk electrodes 111 are electrically connected to each other through the bridging of the conductive bridge 112, thereby avoiding the electrical connection between the first electrode 100 and the second electrode 200. Among them, an insulating layer 500 is provided between the conductive bridge 112 and the second trunk electrode 210, and the first sub-trunk electrode 111 passes through the insulating layer 500 to be electrically connected to the conductive bridge 112 located below the second trunk electrode 210. The present invention does not limit the number and structure of the connecting bridge, and it can be used as follows Figure 2 In the double bridge structure shown in , the two conductive bridges 112 are independent and not connected to each other, and the two conductive bridges 112 are also symmetrical with respect to the first center line L1.

[0078] Furthermore, if Figure 5 As shown, in the first direction x, the two first trunk electrodes 110 in two adjacent touch control units 15 are electrically connected to each other, and the two second electrodes 200 in two adjacent touch control units 15 in the first direction x are insulated from each other, thereby forming a first electrode group 11 extending along the first direction x. In the second direction y, the two second trunk electrodes 210 in two adjacent touch control units 15 are electrically connected to each other, and the two first electrodes 100 in two adjacent touch control units 15 in the second direction y are electrically insulated from each other, thereby forming a second electrode group 12 extending along the second direction y.

[0079] In the embodiment of the present invention, the first electrode 100 is a driving electrode, and the second electrode 200 is a sensing electrode. When a finger touches the display device provided with the touch substrate 1 in the embodiment of the present invention, the parasitic capacitance between the first electrode 100 and the second electrode 200 at the point where the finger touches increases, thereby generating a mutual capacitance signal, and the driving chip 13 detects the specific position touched by the finger by obtaining the change in parasitic capacitance before and after the touch. Therefore, when the capacitance change caused by the touch is small, the traditional capacitive touch screen may not be able to accurately detect whether there is a touch input.

[0080] However, in the embodiment of the present invention, Figure 2 As shown, one end of the first branch electrode 130 is electrically connected to the first primary branch electrode 120, and the other end thereof extends toward the second main electrode 210 or the second secondary main electrode 220, and a plurality of the first branch electrodes 130 form a radial structure extending outward from the first main electrode 110 as the center. Correspondingly, one end of the second branch electrode 230 is electrically connected to the second secondary branch electrode 220 or the second main electrode 210, and the other end thereof extends toward the first main electrode 110, and the second branch electrode 230 and the first branch electrode 130 of the radial structure are alternately arranged and interlocked with each other, so that the second electrode 200 surrounds the first electrode 100 and each branch electrode of the first electrode 100, and the interlocking length between the first electrode 100 and the second electrode 200 is increased in a limited space, which can greatly increase the facing area between the first electrode 100 and the second electrode 200, thereby increasing the parasitic capacitance between the first electrode 100 and the second electrode 200 and the parasitic capacitance variation, thereby improving the sensitivity of the touch substrate 1 in identifying the touch position.

[0081] At the same time, the radial distribution of the branch electrodes makes the mutual capacitance electric field distribution in each touch unit 15 more uniform, which is more conducive to improving the resolution and accuracy of the touch substrate 1 in identifying the touch position. In addition, the multiple first branch electrodes 130 arranged on both sides of the first trunk electrode 110 can reduce the impedance of the first electrode 100 compared to only setting the first trunk electrode 110. Similarly, the multiple second branch electrodes 230 arranged on both sides of the second trunk electrode 210 can also reduce the impedance of the second electrode 200. The reduction of the impedance in the first electrode 100 and the second electrode 200 can further reduce the RC delay in the entire touch unit 15, thereby improving the reporting rate of the touch substrate 1.

[0082] Furthermore, each touch control unit 15 has virtual electrodes, and the virtual electrodes include a first virtual electrode 310, a second virtual electrode 320, and a third virtual electrode 330. Figure 3As shown, in the first area 15A, the first virtual electrode 310 is arranged in the opening 140, and the first virtual electrode 310 is electrically insulated from the first main electrode 110 and the first first main electrode 120, and is not connected to each other. The second virtual electrode 320 is arranged in the gap 240 between the first branch electrode 130 and the second branch electrode 230, and the second virtual electrode 320 is also electrically insulated from the first branch electrode 130 and the second branch electrode 230. The third virtual electrode 330 is arranged on the side of the second electrode 200 away from the first main electrode 110, that is, on the side of the second branch electrode 230 with the longest length away from the first branch electrode 130, and the third virtual electrode 330 is also electrically insulated from the second branch electrode 230. No electrical signal is loaded in the first virtual electrode 310, the second virtual electrode 320 and the third virtual electrode 330. The first virtual electrode 310 and the third virtual electrode 330 are used to reduce the parasitic capacitance of the first electrode 100 and the second electrode 200 to the cathode in the display panel 1000. The second virtual electrode 320 is used to increase the change in parasitic capacitance between the first electrode 100 and the second electrode 200 when a finger touches, further improving the sensitivity of the touch substrate 1. At the same time, the second virtual electrode 320 can also electrically isolate the adjacent first electrode 100 and the second electrode 200 to prevent short circuits between them.

[0083] like Figure 2 As shown, in the second area 15B, the third area 15C and the fourth area 15D, the structure of the virtual electrode is the same as that in the first area 15A. In addition, according to the principle of geometric symmetry, the virtual electrode in the second area 15B is symmetrical with the virtual electrode in the first area 15A with the first center line L1 as the axis, the virtual electrode in the third area 15C is symmetrical with the virtual electrode in the first area 15A with the symmetry center as the center point, and the virtual electrode in the fourth area 15D is symmetrical with the virtual electrode in the first area 15A with the second center line L2 as the axis.

[0084] Furthermore, the materials of the first electrode 100, the second electrode 200 and the dummy electrode can be metal materials or transparent conductive materials, such as one of titanium, aluminum, molybdenum, silver, copper, indium tin oxide (ITO) or aluminum zinc oxide (AZO). When a metal material is used, in order to prevent the touch substrate 1 from affecting the light output of the display panel 1000, the first electrode 100, the second electrode 200 and the dummy electrode are all metal grid structures. Figure 6As shown, the orthographic projection of the metal wiring 400 in the metal grid structure on the display panel 1000 is located between two adjacent light emitting devices 41. Figure 7 As shown, the metal wiring 400 in the metal grid structure is provided with breaks 410 , and the first electrode 100 , the second electrode 200 and the virtual electrode can be electrically insulated through the multiple breaks 410 .

[0085] Specifically, experiments were conducted on the touch control unit in the prior art and the touch control unit 15 provided in the embodiment of the present invention under the same power-on environment, and relevant data as shown in Table 1 were obtained.

[0086]

[0087] Table 1

[0088] Based on the contents in Table 1, it can be known that for the touch control unit 15 provided in the embodiment of the present invention, when the finger does not touch the touch control unit 15, the parasitic capacitance of the first electrode 100 and the second electrode 200 is 0.317 pf, and when the finger touches the touch control unit 15, the parasitic capacitance of the first electrode 100 and the second electrode 200 is 0.378 pf, that is, the change in the parasitic capacitance of the first electrode 100 and the second electrode 200 is 0.061 pf, that is, the ratio of the change in parasitic capacitance to the parasitic capacitance is 16.06%.

[0089] For a conventional touch control unit, when a finger does not touch the conventional touch control unit, the parasitic capacitance of the driving electrode and the sensing electrode in the conventional touch control unit is 0.69 pf, and when a finger touches the touch control unit, the parasitic capacitance of the driving electrode and the sensing electrode in the conventional touch control unit is 0.74 pf, that is, the change in the parasitic capacitance of the driving electrode and the sensing electrode in the conventional touch control unit is 0.05 pf, that is, the ratio of the change in parasitic capacitance to the parasitic capacitance can be 6.76%.

[0090] In summary, using Figure 2 The touch unit 15 configured in the manner shown can reduce the parasitic capacitance of the driving electrode and the sensing electrode by 0.362 pf, and the parasitic capacitance variation of the driving electrode and the sensing electrode can increase by 0.011 pf when a finger touches the touch unit 15. Therefore, the present solution can achieve that the first electrode 100 and the second electrode 200 have a smaller parasitic capacitance and a larger parasitic capacitance variation, thereby improving the ratio of the parasitic capacitance variation to the parasitic capacitance, and further improving the touch accuracy and sensitivity of the touch panel.

[0091] The embodiment of the present invention further provides a display panel 1000, which can be one of different types of light-emitting display panels 1000, such as an OLED (organic light-emitting diode) display panel, an AMOLED (active matrix organic light-emitting diode) display panel, a Mini-LED (mini light-emitting diode) display panel, or a Micro-LED (micro light-emitting diode) display panel. Figure 8 As shown, the display panel 1000 includes a substrate layer 2, an array substrate 3, a light-emitting layer 4, a thin film encapsulation layer 5, a polarizer 6, a cover plate 7, and the touch substrate 1 as described above. The substrate layer 2, the array substrate 3, the light-emitting layer 4, and the thin film encapsulation layer 5 are stacked in sequence, and the touch substrate 1 is arranged on a surface of the thin film encapsulation layer 5 away from the light-emitting layer 4. The polarizer 6 and the cover plate 7 are stacked in sequence on a surface of the touch substrate 1 away from the thin film encapsulation layer 5. Among them, the light-emitting device 41 is located in the light-emitting layer 4, and the light-emitting device 41 can be a light-emitting body such as OLED, Mini-LED or Micro-LED according to needs.

[0092] A touch substrate and a display panel provided in the embodiments of the present invention make the distribution of the mutual capacitance electric field in each touch unit more uniform through the radial branch electrode distribution structure, and increase the bite length between the first electrode and the second electrode in a limited space, greatly increase the area facing each other between the first electrode and the second electrode, and then increase the change in the parasitic capacitance between the first electrode and the second electrode after the touch occurs, effectively improving the sensitivity and accuracy of the touch substrate in identifying the touch position. At the same time, the first branch electrode and the second branch electrode that bite each other can reduce the impedance in the first electrode and the second electrode, thereby reducing the RC delay in the touch unit and improving the reporting rate of the touch substrate.

[0093] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A touch substrate, characterized in that: The invention comprises a plurality of touch control units, each of which has: A first electrode extending along a first direction; a second electrode extending along a second direction perpendicular to the first direction; The first electrode comprises: A first trunk electrode, parallel to the first direction; A plurality of first branch electrodes, arranged on both sides of the first main electrode; Therefore, the first branch electrode extends outwards with the first main electrode as the center, and forms a radial structure; The second electrode comprises: A second main electrode, parallel to the second direction; A plurality of second branch electrodes are arranged on both sides of the second main electrode; The first branch electrodes and the second branch electrodes are alternately arranged to form an interlocking structure; Wherein, the first electrode further comprises: A first stem electrode is disposed on both sides of the first main electrode, and a first angle is formed between the first main electrode and the first stem electrode, and the angle of the first angle is less than 90°; The first branch electrode is disposed on a side of the first primary trunk electrode away from the first main trunk electrode, and a second angle is formed between the first branch electrode and the first main trunk electrode, and the second angle is less than 90°.

2. The touch substrate according to claim 1, wherein: The first primary stem electrode comprises at least two first sub-sub-sub-stem electrodes, and every two of the first sub-sub-sub-stem electrodes are connected to each other and surround an opening with the first primary stem electrode; At least three first branch stem electrodes are disposed on a side of each of the first sub-sub-stem electrodes away from the opening, and the distance between two adjacent first branch stem electrodes is equal; The farther the first branch electrode is from the first main electrode, the longer the first branch electrode is.

3. The touch substrate according to claim 2, wherein: The touch control unit also has: The first virtual electrode is disposed in the opening and is electrically insulated from the first electrode.

4. The touch substrate according to claim 1, wherein: A second branch electrode is disposed on both sides of each of the first branch electrodes, and the farther the second branch electrode is from the first main electrode, the longer the second branch electrode is.

5. The touch substrate according to claim 4, characterized in that: There is a gap between the first branch electrode and the second branch electrode; the touch control unit further comprises: The second virtual electrode is disposed in the gap and is electrically insulated from the first electrode and the second electrode.

6. The touch substrate according to claim 1, wherein: The first trunk electrode includes two first sub-trunk electrodes, which are respectively located on both sides of the second trunk electrode and are bridged by at least one conductive bridge.

7. The touch substrate according to claim 1, wherein: The second electrode further comprises: A secondary trunk electrode, disposed on both sides of the second trunk electrode and parallel to the second trunk electrode; A plurality of the second branch stem electrodes are disposed on one side of the second branch stem electrode close to the first branch stem electrode.

8. The touch substrate according to claim 1, wherein: The touch control unit further includes: The third virtual electrode is disposed on a side of the second electrode away from the first main electrode and is electrically insulated from the second electrode.

9. The touch substrate according to claim 1, wherein: The minimum width of the branch electrodes in the first electrode and the second electrode is greater than the size of two sub-pixels.

10. The touch substrate according to claim 1, wherein: The first electrode and the second electrode are made of a metal grid or a transparent conductive material.

11. The touch substrate according to claim 1, wherein: include: A plurality of first electrode groups are arranged along the second direction and extend along the first direction; A plurality of second electrode groups arranged along the first direction and extending along the second direction; The touch control unit array is arranged in the touch control substrate; In the first direction, the first electrodes in two adjacent touch control units are electrically connected to each other, and a plurality of the first electrodes electrically connected to each other are combined into a first electrode group; In the second direction, the second electrodes in two adjacent touch-sensing units are electrically connected to each other, and a plurality of second electrodes electrically connected to each other are combined into a second electrode group.

12. A display panel, characterized in that: It comprises a touch control substrate as claimed in any one of claims 1 to 11.

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