Touch panel and display device

Abstract

The application provides a touch panel and a display device, relates to the technical field of display, and is used for solving the technical problem that the touch panel is prone to touch failure and false point reporting. The touch panel comprises a substrate and a plurality of touch units. The plurality of touch units are arranged in an array on the substrate. Each touch unit comprises two first touch electrodes and a second touch electrode located between the two first touch electrodes. The two first touch electrodes are connected. An isolation gap is arranged between the first touch electrode and the second touch electrode. A floating electrode is arranged in the isolation gap. The floating electrode is insulated from the first touch electrode and the second touch electrode. The touch display panel and the display device provided by the application are used for realizing touch and display functions.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a touch panel and display device. Background Technology

[0002] Capacitive touch panels are widely used in various electronic interactive devices due to their durability, long lifespan, and support for multi-touch.

[0003] Capacitive touch panels work by detecting fluctuations in the coupling capacitance between touch electrodes to sense touch actions. The coupling capacitance includes near-end capacitance and far-end capacitance. Since changes in the dielectric constant of a capacitive touch panel have a greater impact on the near-end capacitance than on the far-end capacitance.

[0004] When the user's touch action ends, the dielectric constant of the touch location changes due to the temperature of the finger, causing large fluctuations in the near-end capacitance. This affects the accuracy of the coupling capacitance detection of the touch electrode, leading to problems such as unresponsive touch and random touch detection in capacitive touch panels. Summary of the Invention

[0005] In view of the above problems, the touch panel and display device provided in this application embodiment can reduce the influence of dielectric constant change on the coupling capacitance of the touch electrode and improve the accuracy of coupling capacitance detection, so as to avoid the touch panel from being unresponsive or reporting random points.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] A first aspect of this application provides a touch panel, including a substrate and a plurality of touch units; the plurality of touch units are arranged in an array on the substrate, each touch unit including two first touch electrodes and a second touch electrode located between the two first touch electrodes, the two first touch electrodes being connected; in the same touch unit, there is an isolation gap between the first touch electrodes and the second touch electrodes, a floating electrode is disposed in the isolation gap, and the floating electrode is insulated from the first touch electrodes and the second touch electrodes respectively.

[0008] The touch panel provided in this application embodiment includes multiple touch units arranged in an array. Each touch unit includes two first touch electrodes, one second touch electrode, and a floating electrode disposed on the same layer. The second touch electrode is located between the two first touch electrodes, and the two first touch electrodes are connected. A floating electrode is disposed in the isolation gap between the first touch electrode and the second touch electrode, and the floating electrode is insulated from both the first touch electrode and the second touch electrode, thereby increasing the gap between the first touch electrode and the second touch electrode.

[0009] In related technologies, the gap between the first touch electrode and the second touch electrode is small. Therefore, the near-end capacitance between the first touch electrode and the second touch electrode is large, and the far-end capacitance is small. When the dielectric constant of the touch panel changes with temperature, the near-end capacitance fluctuates greatly with temperature changes. This causes the waveguide of the entire touch panel's coupling capacitance to become larger due to temperature changes, affecting the accuracy of the coupling capacitance detection of the touch electrode and thus affecting the normal operation of the touch panel.

[0010] However, the touch panel provided in this application embodiment has an isolation gap between the first touch electrode and the second touch electrode to increase the distance between them, thereby reducing the near-end capacitance and increasing the far-end capacitance. This reduces fluctuations in near-end capacitance caused by temperature changes, minimizing the impact of temperature variations on the touch panel's touch function, preventing touch malfunctions and erroneous callouts, and ensuring normal operation of the touch panel.

[0011] Furthermore, in this embodiment of the application, while increasing the isolation gap between the first touch electrode and the second touch electrode, a floating electrode is placed within the isolation gap. Through the shielding effect of the floating electrode, the near-end capacitance between the first touch electrode and the second touch electrode is further reduced; and the floating electrode can provide a uniform visual effect for the isolation gap, preventing a large isolation gap from being visible to the naked eye, thereby improving the display uniformity effect.

[0012] In one possible implementation, within the same touch unit, the second touch electrode includes a first electrode region and two second electrode regions; along a second direction, the two second electrode regions are respectively located on both sides of the first electrode region; the two first touch electrodes are arranged along a first direction, and the first and second directions intersect; a floating electrode is provided in the isolation gap between the first electrode region, the second electrode region and the first touch electrode.

[0013] In one possible implementation, within the same touch unit, a bridge connecting the two first touch electrodes is disposed at the junction of the first electrode region and the second electrode region.

[0014] In one possible implementation, within the same touch unit, along the second direction, the size of the first electrode region first increases and then decreases in the first direction; within the same touch unit, along the direction from the second electrode region to the first electrode region, the size of the second electrode region gradually decreases in the first direction; optionally, the first electrode region is rhomboid, circular, or elliptical; optionally, the second electrode region is triangular; optionally, the side of the first touch electrode closer to the second touch electrode is M-shaped.

[0015] In one possible implementation, the edges of the isolation gaps form boundaries with the first touch electrode and the second touch electrode, respectively; the extension direction of the floating electrode is consistent with the extension direction of the boundary, and along the extension direction perpendicular to the boundary, there are insulating gaps between the two sides of the floating electrode and the first touch electrode and the second touch electrode, respectively.

[0016] Within the same touch unit, the floating electrode between the second touch electrode and at least one first touch electrode includes multiple sub-electrodes, which are arranged sequentially at intervals along the extension direction of the boundary.

[0017] Compared to having a continuous floating electrode between the first and second touch electrodes, this configuration, which sets the floating electrode as multiple sub-electrodes, means that when the floating electrode is affected by interference signals, each sub-electrode has a smaller impact on the near-end capacitance between the first and second touch electrodes, thereby improving the accuracy of the coupling capacitance detection of the touch panel.

[0018] In one possible implementation, along a first direction, two first touch electrodes located within the same touch unit are symmetrically arranged on both sides of a second touch electrode; one side of the edge of the isolation gap forms an M-shaped boundary with the first touch electrode, and the other side of the isolation gap forms an M-shaped boundary with the second touch electrode; a bridge is provided between the vertices of the M-shaped boundaries of the two first touch electrodes that are close to each other.

[0019] With this configuration, when the touch area of ​​the touch unit is the same, the boundary between the first touch electrode and the second touch electrode in the related technology is U-shaped, that is, the second touch electrode is disposed within part of the first touch electrode, and the boundary between the two is U-shaped. In the embodiment of this application, the edge of the isolation gap forms an M-shaped boundary with the first touch electrode and the second touch electrode, which can reduce the coupling area between the first touch electrode and the second touch electrode, thereby reducing the near-end capacitance of the first touch electrode and the second touch electrode, so as to reduce the impact of temperature changes on the normal operation of the touch panel.

[0020] Optionally, along the direction from the second electrode region to the first electrode region, the M-shaped boundary of the first touch electrode includes a first boundary edge, a second boundary edge, a third boundary edge, and a fourth boundary edge connected sequentially along the second direction, wherein the second boundary edge and the third boundary edge are opposite to the first electrode region via an isolation gap; the first boundary edge and the fourth boundary edge are opposite to the two second electrode regions respectively via isolation gaps.

[0021] A first vertex is formed between the first boundary edge and the second boundary edge, and a second vertex is formed between the third boundary edge and the fourth boundary edge. Within the same touch unit, a bridge is arranged between the first vertices of the M-shaped boundaries of the two first touch electrodes that are opposite each other along a first direction, and a bridge is arranged between the second vertices of the M-shaped boundaries of the two first touch electrodes that are opposite each other along a first direction. With this arrangement, the two first touch electrodes are connected through two bridges, which can reduce the resistance between the first touch electrodes.

[0022] In one possible implementation, the first boundary, the second boundary, the third boundary, and the fourth boundary are each configured as straight line segments, and a sub-electrode is provided on one side of each boundary, and the sub-electrode is a straight line electrode.

[0023] With this configuration, for the same length of floating electrode, compared to the wavy or sawtooth shape of the edge contour of the floating electrode projected onto the substrate in related technologies, it can reduce the coupling area between the first touch electrode and the second touch electrode, thereby reducing the proximal capacitance of the first touch electrode and the second touch electrode, so as to reduce the impact of temperature changes on the normal operation of the touch panel.

[0024] In one possible implementation, the width of the floating electrode is greater than or equal to 80 μm and less than or equal to 120 μm along the extension direction perpendicular to the boundary.

[0025] Optionally, the width of the insulating gap between the floating electrode and the first touch electrode and the second touch electrode is greater than or equal to 5 μm and less than or equal to 10 μm.

[0026] In one possible implementation, the ratio L1 / L2 of the length L1 of the touch unit along the first direction to the length L2 of the touch unit along the second direction is greater than or equal to 0.95 and less than or equal to 1.05.

[0027] Optionally, the length L3 of the first electrode region in the first direction is greater than or equal to 0.6L1 and less than or equal to 0.7L1.

[0028] Optionally, the length L4 of the first electrode region in the second direction is greater than or equal to 0.4L2 and less than or equal to 0.6L2.

[0029] Optionally, within the same touch unit, the projected area of ​​all first touch electrodes on the substrate is greater than or equal to 45% of the area of ​​the entire touch unit and less than or equal to 55% of the area of ​​the entire touch unit.

[0030] Optionally, within the same touch unit, the projected area of ​​the second touch electrode on the substrate is greater than or equal to 35% of the area of ​​the entire touch unit and less than or equal to 45% of the area of ​​the entire touch unit.

[0031] Optionally, within the same touch unit, the projected area of ​​all floating electrodes on the substrate is greater than or equal to 7% of the total area of ​​the touch unit and less than or equal to 10% of the total area of ​​the touch unit.

[0032] A second aspect of this application provides a display device, including the touch panel of the first aspect. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A top view of the touch panel provided in the embodiments of this application;

[0035] Figure 2 Schematic diagram of the arrangement of the floating electrode between the first touch electrode and the second touch electrode provided in the embodiments of this application Figure 1 ;

[0036] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0037] Figure 4 A schematic diagram showing the boundaries of the first touch electrode and the second touch electrode located in the same touch unit, as provided in an embodiment of this application;

[0038] Figure 5 Schematic diagram of the arrangement of the floating electrode between the first touch electrode and the second touch electrode provided in the embodiments of this application Figure 2 .

[0039] Explanation of reference numerals in the attached figures:

[0040] 10 - First touch electrode;

[0041] 20 - Second touch electrode;

[0042] 21 - First electrode region; 22 - Second electrode region;

[0043] 30 - Floating electrode;

[0044] 31-Sub-electrode;

[0045] 40-Cable tray;

[0046] 50-Boundary;

[0047] 51 - First boundary; 52 - Second boundary; 53 - Third boundary;

[0048] 54 - Fourth boundary; 55 - First vertex; 56 - Second vertex;

[0049] 101 - Touch unit;

[0050] 100-Touch panel. Detailed Implementation

[0051] As described in the background section, touch panels in related technologies are prone to issues such as unresponsive touch and erroneous touch detection. The applicant's research has revealed that this problem arises because capacitive touchscreens operate on the principle of detecting fluctuations in the coupling capacitance between touch electrodes to sense touch actions. This coupling capacitance includes near-end capacitance and far-end capacitance. Since the dielectric constant of capacitive touch panels is highly sensitive to temperature changes, even slight variations in the dielectric constant can cause significant fluctuations in the near-end capacitance, while having a smaller impact on the far-end capacitance.

[0052] When a finger is not touching the screen, the dielectric of the far-end capacitor is mainly the air outside the screen, while the dielectric of the near-end capacitor is mainly the screen material. When a finger touches the screen, the temperature of the screen material changes. After the finger leaves the screen, the temperature of the screen material cannot recover immediately, causing the dielectric constant of the near-end capacitor to be significantly affected by temperature.

[0053] For example, when the screen is at a high temperature, touching the screen with a finger has a two-fold combined effect on the coupling capacitance. Firstly, the finger's proximity to the screen reduces the coupling capacitance. Secondly, the heat at the touched area is absorbed, lowering its temperature and consequently reducing the dielectric constant of the screen material, thus decreasing the near-end capacitance. In this case, the temperature difference has a positive effect on touch and does not cause touch problems. However, when the finger is lifted and removed from the touch area, the temperature of the previously touched area does not immediately recover. The near-end capacitance remains smaller than before the touch, causing the original touch location to still register a touch action after the finger is lifted. This affects the accuracy of coupling capacitance detection between the touch electrodes, making the touch panel prone to false triggering.

[0054] Furthermore, when the screen is at a low temperature, touching the screen with a finger has a two-fold combined effect on the coupling capacitance. Firstly, the proximity of the finger to the screen reduces the coupling capacitance. Secondly, the touched area absorbs heat from the finger, causing the temperature at the touch point to rise, which in turn increases the dielectric constant of the screen material and thus the near-end capacitance. In this case, temperature difference has an inverse effect on touch. When the increase in near-end capacitance caused by temperature difference is greater than or equal to the decrease in capacitance caused by finger touch, it will result in no touch response. Therefore, the temperature change of the touch panel during finger touch operation causes a change in the dielectric constant of the screen material, leading to large fluctuations in near-end capacitance. This affects the accuracy of coupling capacitance detection between the touch electrodes, making the touch panel prone to unresponsive touch and false triggering.

[0055] To address the aforementioned technical problems, this application provides a touch panel and display device. By providing an isolation gap between a first touch electrode and a second touch electrode, and arranging a floating electrode within the isolation gap, the distance between the first and second touch electrodes can be increased, thereby reducing the near-end capacitance and increasing the far-end capacitance between the first and second touch electrodes. Furthermore, the shielding effect of the floating electrode further reduces the near-end capacitance between the first and second touch electrodes. This arrangement reduces fluctuations in near-end capacitance caused by temperature changes, minimizing the impact of temperature variations on the touch panel's touch function, preventing unresponsive touches and erroneous callouts, and ensuring the normal operation of the touch panel.

[0056] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0057] The display device provided in this application embodiment may include a touch panel, a display screen, an optical adhesive layer, and a cover plate, wherein the touch panel is disposed on the light-emitting side of the display screen, and an optical adhesive layer is disposed between the cover plate and the touch panel, and the two are bonded together by the optical adhesive layer.

[0058] like Figure 1 As shown, the touch panel 100 provided in this embodiment includes a substrate and a plurality of touch units 101 disposed on the substrate, wherein the plurality of touch units 101 are arranged in an array on the substrate. For ease of description of the embodiments of this application, Figure 1 The X direction shown is the first direction, and the Y direction shown is the second direction.

[0059] like Figures 2 to 4 As shown, each touch unit 101 includes two first touch electrodes 10 arranged along a first direction and a second touch electrode 20 arranged along a second direction. Along the first direction, the second touch electrode 20 is disposed between the two first touch electrodes 10. The first touch electrode 10 can be a driving electrode, and the second touch electrode 20 can be a sensing electrode; alternatively, the first touch electrode 10 can be a sensing electrode, and the second touch electrode 20 can be a driving electrode. The first touch electrode 10 and the second touch electrode 20 can be arranged in the same layer or in different layers, and the two first touch electrodes 10 are connected.

[0060] Furthermore, in the same touch unit 101, an isolation gap exists between the first touch electrode 10 and the second touch electrode 20. The two sides of the isolation gap form boundaries 50 with the first touch electrode 10 and the second touch electrode 20, respectively, that is, the first touch electrode 10 and the second touch electrode 20 are kept insulated by the isolation gap. In this embodiment, a floating electrode 30 is disposed within the isolation gap between the first touch electrode 10 and the second touch electrode 20. Optionally, the floating electrode 30 is disposed in the same layer as at least one of the first touch electrode 10 and the second touch electrode 20.

[0061] See Figure 3 and Figure 4 The floating electrode 30 is disposed within the isolation gap, and the extending direction of the floating electrode 30 is consistent with the extending direction of the boundary 50, that is, the floating electrode 30 is disposed parallel to the boundary 50. Along the extending direction perpendicular to the boundary 50, the floating electrode 30 maintains an insulating gap of greater than or equal to 5 μm and less than or equal to 10 μm between itself and the first touch electrode 10 and the second touch electrode 20, respectively. By setting the insulating gap, the floating electrode 30 is insulated from the first touch electrode 10 and the second touch electrode 20, respectively.

[0062] Optionally, the width of the floating electrode 30 along the extension direction perpendicular to the boundary 50 can be greater than or equal to 80 μm and less than or equal to 120 μm. By setting a larger width for the floating electrode 30, the near-end capacitance can be reduced.

[0063] With this configuration, the present embodiment of the application, by setting an isolation gap between the first touch electrode 10 and the second touch electrode 20, can significantly increase the distance between the first touch electrode 10 and the second touch electrode 20, reduce the proximal capacitance, and at the same time, the floating electrode 30 can also provide a uniform visual effect for the isolation gap, preventing a large isolation gap from being visible to the naked eye, thereby improving the display uniformity. The shielding effect of the floating electrode 30 further reduces the proximal capacitance between the first touch electrode 10 and the second touch electrode 20.

[0064] In related technologies, an insulating gap of 5μm to 10μm is maintained between the first touch electrode 10 and the second touch electrode 20. This results in a larger near-end capacitance and a smaller far-end capacitance between the first touch electrode 10 and the second touch electrode 20. When the dielectric constant of the touch panel changes with temperature, the near-end capacitance is greatly affected by the temperature change. This causes the waveguide of the entire touch panel 100 to become larger due to temperature changes, affecting the accuracy of the coupling capacitance detection of the touch electrodes and thus affecting the normal operation of the touch panel 100.

[0065] The touch panel 100 provided in this embodiment has an isolation gap between the first touch electrode 10 and the second touch electrode 20, increasing the distance between them and thus reducing the near-end capacitance and increasing the far-end capacitance. Furthermore, the shielding effect of the floating electrode 30 further reduces the near-end capacitance between the first touch electrode 10 and the second touch electrode 20. Therefore, fluctuations in near-end capacitance caused by temperature changes can be reduced, minimizing the impact of temperature variations on the touch function of the touch panel 100, preventing touch malfunctions and erroneous reporting, and ensuring normal operation of the touch panel 100.

[0066] See Figure 2 and Figure 3 As shown in the embodiment of this application, within the same touch unit 101, along the first direction X, two first touch electrodes 10 are respectively disposed on both sides of the second touch electrode 20, that is, the first touch electrodes 10 are arranged along the first direction X on both sides of the second touch electrode 20.

[0067] Optionally, the second touch electrode 20 includes a first electrode region 21 and two second electrode regions 22, wherein along the second direction Y, the two second electrode regions 22 are respectively located on both sides of the first electrode region 21, that is, the first electrode region 21 is disposed between the two second electrode regions 22. It should be noted that the first direction X intersects the second direction Y, for example, the first direction X and the second direction Y are perpendicular. Optionally, the second touch electrode 20 is funnel-shaped.

[0068] Optionally, a floating electrode 30 is disposed in the isolation gap between the first electrode region 21 and the first touch electrode 10, and / or a floating electrode 30 is disposed in the isolation gap between the second electrode region 22 and the first touch electrode 10. Optionally, a floating electrode 30 is disposed in the isolation gap between the first electrode region 21 and the second electrode region 22 and the first touch electrode 10, so as to further reduce the proximal capacitance between the first touch electrode 10 and the second touch electrode 20.

[0069] In this embodiment, the first electrode region 21 and the second electrode region 22 are respectively separated from the first touch electrode 10 by isolation gaps; in other words, the boundary regions of the first electrode region 21, the second electrode region 22 and the first touch electrode 10 are respectively provided with isolation gaps, the above-mentioned floating electrode 30 is disposed in the isolation gap, and the floating electrode 30 and the first touch electrode 10 maintain a certain gap so that the floating electrode is insulated from the first touch electrode.

[0070] For example, within the same touch unit 101, along the second direction Y, the size of the first electrode region 21 in the first direction X first increases and then decreases; and along the direction from the second electrode region 22 to the first electrode region 21, the size of the second electrode region 22 in the first direction X gradually decreases.

[0071] For example, in this embodiment, the first electrode region 21 is rhomboid, circular, or elliptical, and this embodiment is not limited to this. Optionally, the second electrode region 22 is triangular. Optionally, this embodiment is described using the example of the first electrode region 21 being rhomboid and the second electrode region 22 being triangular.

[0072] Optionally, along the second direction Y, two second electrode regions 22 located within the same touch unit 101 are symmetrically arranged on both sides of the first electrode region 21.

[0073] Based on the above embodiment, the first electrode region 21 is rhomboid, and the second electrode region 22 is located on one side of the first electrode region 21 and is triangular, and the first electrode region 21 and the second electrode region 22 are connected; then the first touch electrode 10, the second touch electrode 20 and the two sides of the isolation gap respectively form M-shaped boundaries 50. Optionally, the first touch electrode is M-shaped.

[0074] like Figure 4 As shown, for ease of description of the embodiments of this application, the M-shaped boundary 50 of the first touch electrode includes a first boundary 51, a second boundary 52, a third boundary 53, and a fourth boundary 54 connected sequentially along a second direction. The second boundary 52 and the third boundary 53 are opposite to the first electrode region 21 via isolation gaps; the first boundary 51 and the fourth boundary 54 are opposite to the two second electrode regions 22 via isolation gaps, respectively.

[0075] The orthographic projection of the edge contour of the first electrode region 21 onto the substrate is rhomboid, that is, the first electrode region 21 is a rhomboid region. Along the first direction X, the two sides of the first electrode region 21 located on the same side are opposite to the second boundary edge 52 and the third boundary edge 53 through the isolation gap.

[0076] The orthographic projection of the second electrode region 22 on the substrate is triangular, that is, the second electrode region 22 is a triangular region. Along the second direction, the second electrode region 22 located on one side of the first electrode region 21 has its hypotenuse facing the first boundary 51 in the M-shaped boundary 50 through the isolation gap; the second electrode region 22 located on the other side of the first electrode region 21 has its hypotenuse facing the fourth boundary 54 in the M-shaped boundary 50 through the isolation gap.

[0077] With this configuration, given the same touch area of ​​the touch unit 101, compared to the U-shaped boundary between the first touch electrode 10 and the second touch electrode 20 in related technologies, the M-shaped boundary formed by the first touch electrode 10, the second touch electrode 20, and the edge of the isolation gap can reduce the coupling area between the first touch electrode 10 and the second touch electrode 20, thereby reducing the near-end capacitance of the first touch electrode 10 and the second touch electrode 20, and reducing the impact of temperature changes on the normal operation of the touch panel 100.

[0078] Optionally, within the same touch unit 101, a bridge 40 connecting the two first touch electrodes 10 is disposed at the junction of the first electrode region 21 and the second electrode region 22. Within the same touch unit 101, two bridges 40 are disposed between the two first touch electrodes 10. Each bridge 40 is disposed between the vertices of the M-shaped boundaries 50 of the two first touch electrodes 10 that are close to each other, and both ends of each bridge 40 are connected to the two first touch electrodes 10, that is, the two first touch electrodes 10 are bridged through the bridge 40.

[0079] Specifically, the first vertex 55 is formed between the first boundary edge 51 and the second boundary edge 52, and the second vertex 56 is formed between the third boundary edge 53 and the fourth boundary edge 54.

[0080] Optionally, along the first direction X, two first touch electrodes 10 located within the same touch unit 101 are symmetrically arranged on both sides of the second touch electrode 20. The two first touch electrodes 10 are symmetrically arranged about the second touch electrode 20, and each of the two first touch electrodes 10 forms an M-shaped boundary 50 on the side facing the second touch electrode 20.

[0081] Within the same touch unit 101, a bridge 40 is arranged between the first vertices 55 of the M-shaped boundaries of the two first touch electrodes 10 that are opposite each other along the first direction X, and a bridge 40 is arranged between the second vertices 56 of the M-shaped boundaries of the two first touch electrodes 10 that are opposite each other along the first direction X. Located within the same touch unit 101, one bridge 40 is provided between the two first vertices 55, and another bridge 40 is provided between the two second vertices 56, with each bridge 40 having its two ends connected to the two first touch electrodes 10 respectively.

[0082] In other words, since the first electrode region 21 is connected to the second electrode region 22, one bridge 40 can be disposed at the connection between the first electrode region 21 and the second electrode region 22 located on one side, and the other bridge 40 can be disposed at the connection between the second electrode region 22 and the second electrode region 22 located on the other side. With this arrangement, the two first touch electrodes 10 are connected through the two bridges 40, which can reduce the resistance between the first touch electrodes 10.

[0083] It should be noted that the touch panel 100 may include a bottom metal layer, an insulating layer (e.g., an optical adhesive layer), and a patterned metal layer. The bridge 40 may be formed on the bottom metal layer, and the first touch electrode 10 and the second touch electrode 20 may be formed on the patterned metal layer, which is located above the bottom metal layer. The insulating layer has through-holes at the bridging locations. The patterned metal layer and the bottom metal layer are connected through conductive structures within the through-holes, thus completing the bridging. Within the same touch unit 101, each first touch electrode 10 may be a grid-shaped electrode, and / or each second touch electrode 20 may be a grid-shaped electrode, and / or each floating electrode 30 may be a grid-shaped electrode, to avoid obstructing the display light-emitting unit of the screen and thus avoid affecting the display. The mesh sizes of the first touch electrode 10, the second touch electrode 20, and the floating electrode 30 may be the same or different.

[0084] Optionally, in this embodiment, the length e of the bridge 40 in the first direction can be greater than or equal to 200 μm and less than or equal to 300 μm. This can prevent the gap between the two first touch electrodes 10 from being too small, thereby increasing the proximal capacitance between the first touch electrode 10 and the second touch electrode 20. Furthermore, it can prevent the connection area between the first electrode region 21 and the second electrode region 22 from being too small, thereby increasing the conduction resistance between the first electrode region 21 and the second electrode region 22.

[0085] See Figure 3 and Figure 5 As shown, based on the above embodiment, within the same touch unit 101, the floating electrode 30 between the second touch electrode 20 and at least one first touch electrode 1 (for example, the second touch electrode 20 and any first touch electrode 1) includes a plurality of sub-electrodes 31, which are arranged sequentially and at intervals along the extension direction of the boundary 50.

[0086] Specifically, the floating electrode 30 is arranged along the extension direction of the M-shaped boundary 50. The floating electrode 30 includes multiple sub-electrodes 31. The M-shaped boundary 50 includes four consecutive boundary edges, namely the first boundary edge 51, the second boundary edge 52, the third boundary edge 53 and the fourth boundary edge 54.

[0087] For example, the floating electrode 30 includes four sub-electrodes 31, each sub-electrode 31 is arranged along the extension direction of each boundary, and two adjacent sub-electrodes 31 can be disconnected at the vertex of the boundary, that is, two adjacent sub-electrodes 31 are disconnected to maintain a gap.

[0088] Compared to having a continuous floating electrode 30 between the first touch electrode 10 and the second touch electrode 20, this configuration, which sets the floating electrode 30 into multiple sub-electrodes 31, means that when the floating electrode 30 is affected by interference signals, each sub-electrode 31 has a smaller impact on the near-end capacitance between the first touch electrode 10 and the second touch electrode 20, thereby improving the accuracy of coupling capacitance detection of the touch panel 100.

[0089] Optionally, in this embodiment of the application, the first boundary 51, the second boundary 52, the third boundary 53, and the fourth boundary 54 are each configured as straight segments. A sub-electrode 31 is provided on one side of each boundary, and each sub-electrode 31 is configured as a straight electrode, meaning that the orthographic projection of each boundary on the substrate is a straight segment. Correspondingly, each sub-electrode 31 of the floating electrode 30 is configured as a straight electrode with a certain width. Further, each sub-electrode 31 maintains a certain insulating gap with the first touch electrode 10 and the second touch electrode 20.

[0090] With this configuration, for the same boundary length, compared to the wavy or sawtooth shape of the orthographic projection of the boundary in the prior art, the boundary edges in this embodiment are configured as straight segments, which can reduce the coupling area between the first touch electrode 10 and the second touch electrode 20, thereby reducing the near-end capacitance of the first touch electrode 10 and the second touch electrode 20, so as to reduce the impact of temperature changes on the normal operation of the touch panel 100.

[0091] It should be noted that each of the sub-electrodes 31 described above can be a straight wire disposed within an insulating gap to form a straight electrode; for example, the sub-electrode 31 can be a straight metal wire. Or, as... Figure 5 As shown, each of the sub-electrodes 31 can be a grid-shaped wire disposed in the isolation gap to form a grid-shaped electrode. For example, the sub-electrode 31 can be a grid-shaped metal wire. With this arrangement, the sub-electrode 31, the first touch electrode 10, and the second touch electrode 20 are all grid-shaped, which facilitates manufacturing.

[0092] Continue reading Figure 2 and Figure 3Based on the above embodiments, the ratio L1 / L2 of the extension length L1 of each touch unit 101 in the first direction to the extension length L2 of the touch unit 101 in the second direction is greater than or equal to 0.95 and less than or equal to 1.05. That is, the extension length L1 (maximum dimension in the first direction X) of the touch unit 101 in the first direction X is approximately equal to the extension length L2 (maximum dimension in the second direction Y) of the touch unit 101 in the second direction Y. The touch unit 101 can be rectangular, for example, it can be square.

[0093] Optionally, along the first direction X, the length L3 of the first electrode region 21 is greater than or equal to 0.6L1 and less than or equal to 0.7L1. Here, L1 is the extension length of the touch unit 101 in the first direction X. By increasing the size of the first electrode region 21 in the first direction X, the area of ​​the first electrode region 21 is increased, thereby increasing the far-end capacitance and reducing the impact of temperature changes on the touch function.

[0094] Optionally, along the second direction Y, the length L4 of the first electrode region 21 is greater than or equal to 0.4L2 and less than or equal to 0.6L2. Here, L2 is the extension length of the touch unit 101 in the second direction Y. By increasing the size of the first electrode region 21 in the second direction Y, the area of ​​the first electrode region 21 is increased, thereby increasing the far-end capacitance and reducing the impact of temperature changes on the touch function. Optionally, along the second direction Y, the length L4 of the first electrode region 21 is equal to 0.5L2.

[0095] With this configuration, the projected area of ​​all the first touch electrodes 10 on the substrate within the same touch unit 101 is greater than or equal to 45% of the area of ​​the entire touch unit 101, and less than or equal to 55% of the area of ​​the entire touch unit 101.

[0096] Within the same touch unit 101, the projected area of ​​the second touch electrode 20 on the substrate is greater than or equal to 35% of the area of ​​the entire touch unit 101, and less than or equal to 45% of the area of ​​the entire touch unit 101.

[0097] Within the same touch unit 101, the projected area of ​​all floating electrodes on the substrate is greater than or equal to 7% of the total area of ​​the touch unit 101, and less than or equal to 10% of the total area of ​​the touch unit 101.

[0098] Therefore, within the same touch unit 101, the first electrode area 21 has a larger area to avoid the situation where the area of ​​the first electrode area 21 is too small, which would cause the second touch electrode 20 to be unable to sense when the user touches the first electrode area 21 with their finger, thus affecting the balance of the entire far-end capacitance and the normal operation of the touch panel 100.

[0099] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0100] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0101] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0102] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A touch panel, characterized by, The substrate and a plurality of touch units are included. The plurality of touch units are arranged in an array on the substrate, each of the touch units includes two first touch electrodes and a second touch electrode between the two first touch electrodes, and the two first touch electrodes are connected. In the same touch unit, the first touch electrode and the second touch electrode have an isolation gap therebetween, and a floating electrode is arranged in the isolation gap and insulated from the first touch electrode and the second touch electrode. In the same touch unit, the second touch electrode includes a first electrode region and two second electrode regions. In a second direction, the two second electrode regions are respectively located on two sides of the first electrode region, and the two first touch electrodes are arranged in a first direction, and the first direction intersects the second direction. The first electrode region and the second electrode region are both provided with the floating electrode in the isolation gap between the first touch electrode and the second touch electrode. In the same touch unit, in the second direction, the size of the first electrode region in the first direction first increases and then decreases. In the same touch unit, in the direction of the second electrode region pointing to the first electrode region, the size of the second electrode region in the first direction gradually decreases. The side of the first touch electrode close to the second touch electrode is in an M shape. The edges of the isolation gap respectively form boundaries with the first touch electrode and the second touch electrode. The extension direction of the floating electrode is consistent with the extension direction of the boundary, and along the extension direction perpendicular to the boundary, the two sides of the floating electrode respectively have an insulating gap between the first touch electrode and the second touch electrode. In the same touch unit, the floating electrode between the second touch electrode and at least one first touch electrode includes a plurality of sub-electrodes, and the plurality of sub-electrodes are sequentially and spaced arranged along the extension direction of the boundary. The edge of the isolation gap on one side forms an M-shaped boundary with the first touch electrode, and the other side of the isolation gap forms an M-shaped boundary with the second touch electrode. The M-shaped boundary of the first touch electrode includes a first boundary edge, a second boundary edge, a third boundary edge and a fourth boundary edge sequentially connected in a second direction, wherein the second boundary edge and the third boundary edge are opposite to the first electrode region through the isolation gap, and the first boundary edge and the fourth boundary edge are respectively opposite to the two second electrode regions through the isolation gap. The first boundary edge, the second boundary edge, the third boundary edge and the fourth boundary edge are respectively configured as straight line segments, and one sub-electrode is arranged on one side of each boundary edge, and the sub-electrode is a straight line electrode. The ratio L1 / L2 of the length L1 of the touch unit in the first direction to the length L2 of the touch unit in the second direction is greater than or equal to 0.95 and less than or equal to 1.

05. The length L3 of the first electrode region in the first direction is greater than or equal to 0.6L1 and less than or equal to 0.7L1. The length L4 of the first electrode region in the second direction is greater than or equal to 0.4L2 and less than or equal to 0.6L2.

2. The touch panel according to claim 1, wherein The bridge connecting the two first touch electrodes is arranged at the communication position of the first electrode region and the second electrode region.

3. The touch panel according to claim 1, wherein The first electrode region is in a shape of a rhombus, a circle or an ellipse.

4. The touch panel according to claim 3, wherein The second electrode region is in a shape of a triangle.

5. The touch panel according to claim 1, wherein The two first touch electrodes in the same touch unit are symmetrically arranged on both sides of the second touch electrode along the first direction. The bridge is arranged between the mutually close vertices of the M-shaped boundary of the two first touch electrodes.

6. The touch panel of claim 5, wherein, The first boundary and the second boundary form a first vertex, and the third boundary and the fourth boundary form a second vertex; the bridge is arranged between the first vertex of the M-shaped boundary of the two first touch electrodes opposite to each other along the first direction and between the second vertex of the M-shaped boundary of the two first touch electrodes opposite to each other along the first direction in the same touch unit.

7. The touch panel according to claim 1, wherein The width of the floating electrode along the extension direction of the boundary is greater than or equal to 80μm and less than or equal to 120μm. The width of the insulating gap between the floating electrode and the first touch electrode and the second touch electrode is greater than or equal to 5μm and less than or equal to 10μm.

8. The touch panel according to claim 1, wherein The total projected area of the first touch electrodes on the substrate in the same touch unit is greater than or equal to 45% of the area of the entire touch unit and less than or equal to 55% of the area of the entire touch unit. The projected area of the second touch electrode on the substrate in the same touch unit is greater than or equal to 35% of the area of the entire touch unit and less than or equal to 45% of the area of the entire touch unit. The total projected area of the floating electrodes on the substrate in the same touch unit is greater than or equal to 7% of the area of the entire touch unit and less than or equal to 10% of the area of the entire touch unit.

9. The touch panel according to claim 1, wherein The coupling capacitance between the touch electrodes includes a near-end capacitance and a far-end capacitance, the dielectric of the far-end capacitance includes air outside the screen body, and the dielectric of the near-end capacitance includes the screen body material; compared with the far-end capacitance, the dielectric coefficient of the near-end capacitance is greatly affected by temperature.

10. A display device, characterized by comprising: The display device further comprises a display screen, an optical adhesive layer and a cover plate, the touch panel is arranged on the light-emitting side of the display screen, the optical adhesive layer is arranged between the cover plate and the touch panel, and the cover plate is bonded by the optical adhesive layer.

11. The display device according to claim 10, wherein The display device further comprises a display screen, an optical adhesive layer and a cover plate, the touch panel is arranged on the light-emitting side of the display screen, the optical adhesive layer is arranged between the cover plate and the touch panel, and the cover plate is bonded by the optical adhesive layer.

Images