Touch panel and display device
By adding auxiliary touch electrodes to the touch panel and setting a hollow part, the relative area between the touch electrodes is increased, and the sensitivity difference caused by small capacitance value is solved, and more accurate touch signal detection is achieved.
Patent Information
- Application Number
- CN202420643011.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-03-29
AI Technical Summary
In the prior art, the distance between the touch electrodes is larger and the relative area is smaller, resulting in a smaller capacitance value, and the detection of touch signal is susceptible to display noise, reducing the sensitivity of touch testing.
By adding an auxiliary touch electrode electrically connected to the first touch electrode in the touch panel, and a hollow part is provided around the second touch electrode, the auxiliary touch electrode is nested in the hollow part, and the relative area between the first touch electrode and the second touch electrode is increased, thereby increasing the capacitance value.
It improves the sensitivity of touch testing, reduces the impact of other noises, and makes touch signal detection more accurate.
Smart Images
Figure CN222653385U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display technology, and in particular to a touch panel and display device. Background Technology
[0002] With the continuous development of science and technology, touch screen electronic devices are being used more and more widely in people's daily lives and work.
[0003] In related technologies, both types of touch electrodes are set with a diamond pattern. When touched, capacitance is generated between the finger and the two types of touch electrodes to determine the position information of the touch.
[0004] However, in related technologies, the distance between the two touch electrodes is relatively large, resulting in a small relative area and a small capacitance value between them, i.e., a small mutual capacitance value at a single point. As a result, touch signal detection is easily affected by display noise, reducing the sensitivity of touch testing. Summary of the Invention
[0005] This application aims to provide a touch panel and display device to solve the technical problems in the related art where touch signal detection is easily affected by display noise and touch test sensitivity is poor.
[0006] In a first aspect, embodiments of this application propose a touch panel, including a substrate and a plurality of touch electrodes arranged in an array on the substrate. The plurality of touch electrodes include a plurality of first touch electrodes continuously distributed along a first direction and a plurality of second touch electrodes continuously distributed along a second direction. The first direction and the second direction intersect. The first touch electrodes and the second touch electrodes are spaced apart and insulated from each other. The touch electrodes also include auxiliary touch electrodes electrically connected to the first touch electrodes. The second touch electrodes are provided with a plurality of hollow portions. The plurality of auxiliary touch electrodes around the second touch electrodes and electrically connected to the first touch electrodes are respectively nested in the hollow portions, and the auxiliary touch electrodes are spaced apart and insulated from the edges of the hollow portions.
[0007] In one possible implementation, both the first touch electrode and the second touch electrode are rhomboid in shape, and an auxiliary touch electrode is provided on each of the four sides of the first touch electrode, and the ratio of the area of the auxiliary touch electrode to the area of the second touch electrode is less than 1 / 4.
[0008] In one possible implementation, the auxiliary touch electrode has the same shape as the first touch electrode.
[0009] In one possible implementation, it further includes a first connecting bridge, a second connecting bridge, and an auxiliary connecting bridge, wherein two adjacent first touch electrodes along a first direction are electrically connected through the first connecting bridge; two adjacent second touch electrodes along a second direction are electrically connected through the second connecting bridge; and the first touch electrodes and the auxiliary touch electrodes are electrically connected through the auxiliary connecting bridge.
[0010] In one possible implementation, the touch panel further includes a first metal layer, an insulating layer, and a second metal layer sequentially formed on a substrate; wherein a first touch electrode, a second touch electrode, an auxiliary touch electrode, a first connecting bridge, and an auxiliary connecting bridge are formed on the first metal layer, and the second connecting bridge is located on the second metal layer.
[0011] In one possible implementation, it further includes a first touch trace and a second touch trace located on the second metal layer extending along a second direction; the insulating layer is provided with vias, the first touch trace is electrically connected to the first touch electrode through the vias, and the second touch trace is electrically connected to the second touch electrode through the vias.
[0012] In one possible implementation, the orthographic projection of a portion of the first touch trace on the substrate coincides with the orthographic projection of the first touch electrode on the substrate, and the length of the first touch trace in the overlapping portion accounts for at least one-third of the total length of the first touch trace; the second touch trace is arranged parallel to the second connecting bridge.
[0013] In one possible implementation, the number of first touch traces is at least two, and the two first touch traces are electrically connected to the first touch electrodes located at both ends of the same row.
[0014] In one possible implementation, the widths of the auxiliary connecting bridge, the first connecting bridge, and the second connecting bridge are all equal.
[0015] Secondly, embodiments of this application provide a display device, including: a display panel and a touch panel as mentioned above, located on the light-emitting side of the display panel or embedded inside the display panel.
[0016] This application provides a touch panel and a display device. The touch panel includes a substrate and a plurality of touch electrodes arranged in an array on the substrate. The plurality of touch electrodes includes a plurality of first touch electrodes continuously distributed along a first direction and a plurality of second touch electrodes continuously distributed along a second direction. The first and second directions intersect. The first touch electrodes and the second touch electrodes are spaced apart and insulated from each other. The touch electrodes also include auxiliary touch electrodes electrically connected to the first touch electrodes. The second touch electrodes are provided with a plurality of hollow portions. The plurality of auxiliary touch electrodes around the second touch electrodes and electrically connected to the first touch electrodes are nested in the hollow portions, and the auxiliary touch electrodes are spaced apart and insulated from the edges of the hollow portions. This application increases the auxiliary touch electrodes electrically connected to the first touch electrodes, increases the relative area between the first touch electrodes and the second touch electrodes, increases the capacitance value between the first touch electrodes and the second touch electrodes, that is, increases the single-point mutual capacitance value, reduces the influence of other noise, and improves the sensitivity of touch testing. Attached Figure Description
[0017] The features, advantages, and technical effects of exemplary embodiments of the present application will now be described with reference to the accompanying drawings. In the drawings, the same components are referred to by the same reference numerals. The drawings are not drawn to scale and are only used to illustrate relative positions. The layer thicknesses in some areas are exaggerated for ease of understanding; the layer thicknesses in the drawings do not represent actual layer thickness proportions.
[0018] Figure 1 A top view showing the structure of a touch panel according to the first embodiment of this application;
[0019] Figure 2 A side view showing the structure of a touch panel according to the first embodiment of this application is shown;
[0020] Figure 3 This illustration shows a flowchart of a method for manufacturing a touch panel according to a second embodiment of this application;
[0021] Figure 4 This is a schematic diagram of the structure of a display device provided in the third embodiment of this application.
[0022] Figure label:
[0023] 100. Display device; 10. Touch panel; 101. Substrate
[0024] 11. First touch electrode;
[0025] 12. Second touch electrode; 121. Hollowed-out section;
[0026] 13. Auxiliary touch electrodes;
[0027] 14. First connecting bridge;
[0028] 15. Second connecting bridge;
[0029] 16. Auxiliary connecting bridge;
[0030] 17. First metal layer;
[0031] 18. Insulating layer; 181. Via;
[0032] 19. Second metal layer; 191. First touch trace; 192. Second touch trace;
[0033] 20. Display panel. Detailed Implementation
[0034] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of the regional structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.
[0035] In related technologies, the distance between touch electrodes is relatively large, resulting in a small relative area and a small capacitance value between them, i.e., a small mutual capacitance value at a single point. This makes touch signal detection susceptible to display noise, reducing the sensitivity of touch testing.
[0036] In view of this, the present application provides a touch panel and display device, which increases the relative area between the first touch electrode and the second touch electrode by adding an auxiliary touch electrode electrically connected to the first touch electrode, increasing the single-point mutual capacitance value, reducing the influence of other noise, and improving the sensitivity of touch testing.
[0037] The specific structure and process of the touch panel and display device provided in each embodiment of this application are described below with reference to the accompanying drawings.
[0038] First Embodiment
[0039] Figure 1 This is a top view showing the structure of a touch panel 10 provided in the first embodiment of this application.
[0040] like Figure 1As shown, a touch panel 10 provided in the first embodiment of this application includes a substrate 101 and a plurality of touch electrodes arranged in an array on the substrate 101. The plurality of touch electrodes include a plurality of first touch electrodes 11 continuously distributed along a first direction X and a plurality of second touch electrodes 12 continuously distributed along a second direction Y. The first direction X and the second direction Y intersect, and the first touch electrodes 11 and the second touch electrodes 12 are spaced apart and insulated from each other.
[0041] Optionally, the multiple touch electrodes are self-capacitance type, meaning each touch electrode forms a capacitor with ground. Each touch electrode is connected to the control chip via touch leads. These leads transmit touch drive signals from the control chip to each touch electrode and also transmit touch sensing signals generated by the touch electrodes back to the control chip via the same leads. The multiple touch electrodes receive pulse information signals from the control chip to form a phase-shifting network across the entire plane.
[0042] Optionally, the multiple touch electrodes are of mutual capacitance type, meaning that a capacitor is formed at the intersection of the first touch electrode 11 and the second touch electrode 12. Either the first touch electrode 11 or the second touch electrode 12 is a touch driving electrode, and the other is a touch sensing electrode. When an excitation signal is applied to the touch driving electrode, due to the mutual capacitance, this excitation signal can be sensed and received on the touch sensing electrode. The magnitude and phase shift of the received signal are related to the frequency of the excitation signal and the magnitude of the mutual capacitance. In other words, the touch position is determined based on the capacitance between the touch driving electrode and the touch sensing electrode.
[0043] For ease of explanation, each embodiment of this application is described using an example of multiple touch electrodes being of mutual capacitance type.
[0044] The touch electrode also includes an auxiliary touch electrode 13 electrically connected to the first touch electrode 11. The second touch electrode 12 is provided with a plurality of hollow portions 121. The plurality of auxiliary touch electrodes 13 around the second touch electrode 12 and electrically connected to the first touch electrode 11 are nested in the hollow portions 121 (the dotted part in the figure), and the auxiliary touch electrodes 13 are spaced apart from and insulated from the edges of the hollow portions 121.
[0045] The working principle of the touch panel 10 is as follows: When a finger approaches or touches the plane containing multiple touch electrodes, the finger acts as a conductor, and the capacitance of the finger is superimposed on the capacitance of the flexible touch panel 10, increasing the capacitance of the touch panel 10. During touch detection, the touch panel 10 sequentially detects multiple first touch electrodes 11 and multiple second touch electrodes 12. Based on the change in capacitance before and after the touch, the coordinates along the first direction X and the second direction Y are determined respectively, and then combined to form the touch coordinates of the plane. This is equivalent to projecting the touch point on the touch panel 10 onto the X and Y axes respectively, calculating the coordinates in the X and Y axes respectively, and finally combining them to form the coordinates of the touch point.
[0046] If the capacitance between the first touch electrode 11 and the second touch electrode 12 is too small, it will be difficult to detect the change in capacitance before and after touching, and it will be easily drowned out by display noise, reducing the test sensitivity.
[0047] This application adds an auxiliary touch electrode 13 electrically connected to the first touch electrode 11. This increases the relative area between the auxiliary touch electrode 13 and the second touch electrode 12, thereby increasing the capacitance between them and thus increasing the single-point mutual capacitance. Display noise has less impact on larger single-point mutual capacitance values, making it easier to detect changes in capacitance before and after touch, thus improving the accuracy of touch testing.
[0048] For example, if the side length of the first touch electrode 11 and the second touch electrode 12 is 4mm, and the auxiliary touch electrode 13 is not provided, the single-point mutual capacitance between them is 0.624pF, and the change after touch is -0.062pF. With the auxiliary touch electrode 13 provided, and the side length of the auxiliary touch electrode 13 being 1mm, the single-point mutual capacitance between the first touch electrode 11 and the second touch electrode 12 is 1.248pF, and the change after touch is -0.17pF. The signal change is significantly increased after the auxiliary touch electrode 13 is provided, thereby improving the sensitivity of the touch test.
[0049] In some embodiments, the first touch electrode 11 and the second touch electrode 12 are both rhomboid in shape, and an auxiliary touch electrode 13 is provided on each of the four sides of the first touch electrode 11, and the ratio of the area of the auxiliary touch electrode 13 to the area of the second touch electrode 12 is less than 1 / 4.
[0050] In some embodiments, the auxiliary touch electrode 13 has the same shape as the first touch electrode 11, and the shapes of the auxiliary touch electrode 13 and the first touch electrode 11 can be any one of rhombus, rectangle, circle, or polygon.
[0051] Correspondingly, the shapes of the plurality of hollow portions 121 of the second touch electrode 12 are the same as the shapes of the auxiliary touch electrode 13.
[0052] The shapes of the plurality of hollow portions 121 of the auxiliary touch electrode 13 and the second touch electrode 12 may include, but are not limited to, the above-mentioned shapes. This application does not limit the shapes of the plurality of hollow portions 121 of the auxiliary touch electrode 13 and the second touch electrode 12.
[0053] In some embodiments, the system further includes a first connecting bridge 14, a second connecting bridge 15, and an auxiliary connecting bridge 16. Two adjacent first touch electrodes 11 along a first direction X are electrically connected via the first connecting bridge 14; two adjacent second touch electrodes 12 along a second direction Y are electrically connected via the second connecting bridge 15; and the first touch electrodes 11 and the auxiliary touch electrodes 13 are electrically connected via the auxiliary connecting bridge 16. This allows the first touch electrodes 11, the second touch electrodes 12, and the auxiliary touch electrodes 13 to be interconnected to form a mesh structure.
[0054] Figure 2 This is a side view showing the structure of a touch panel 10 provided in the first embodiment of this application.
[0055] like Figure 2 As shown, the touch panel 10 also includes a first metal layer 17, an insulating layer 18, and a second metal layer 19 sequentially formed on the substrate 101; wherein the first touch electrode 11, the second touch electrode 12, the auxiliary touch electrode 13, the first connecting bridge 14, and the auxiliary connecting bridge 16 are formed on the first metal layer 17, and the second connecting bridge 15 is located on the second metal layer 19.
[0056] Specifically, it also includes a first touch trace 191 and a second touch trace 192 located on the second metal layer 19 extending along the second direction Y; the insulating layer 18 is provided with a via 181, the first touch trace 191 is electrically connected to the first touch electrode 11 through the via 181, and the second touch trace 192 is electrically connected to the second touch electrode 12 through the via 181.
[0057] This application sets the first touch trace 191, the second touch trace 192, and the second connecting bridge 15 on the same layer, thereby reducing the overall thickness of the touch panel 10.
[0058] In some embodiments, the orthographic projection of a portion of the first touch trace 191 onto the substrate 101 coincides with the orthographic projection of the first touch electrode 11 onto the substrate 101, and the length of the first touch trace 191 with the overlapping orthographic projection is at least one-third of the total length of the first touch trace 191; the second touch trace 192 is arranged in parallel with the second connecting bridge 15.
[0059] Figure 1As shown, the orthographic projection of a portion of the first touch trace 191 onto the substrate 101 coincides with the orthographic projection of the first touch electrode 11 onto the substrate 101. The second touch trace 192 is parallel to the second connecting bridge 15. The first touch trace 191 and the second touch trace 192 only cover the edges of the first touch electrode 11 and the second touch electrode 12, and do not cover the first touch electrode 11 and the second touch electrode 12, so as to avoid the situation where the user presses the first touch electrode 11 or the second touch electrode 12 when touching the display panel, thereby reducing the sensitivity of the touch panel 10.
[0060] In some embodiments, the number of first touch traces 191 is at least two, and the two first touch traces 191 are electrically connected to the first touch electrodes 11 located at both ends of the same row. By configuring the display panel with double-sided driving traces, the signal line impedance is reduced and the touch response speed is improved.
[0061] In some embodiments, the width of the auxiliary connecting bridge 16 is equal to the width of the first connecting bridge 14 and the width of the second connecting bridge 15. With all three having equal widths, the signal transmission speed is consistent, ensuring fast response.
[0062] In this embodiment, by adding an auxiliary touch electrode 13 electrically connected to the first touch electrode 11, the relative area between the first touch electrode 11 and the second touch electrode 12 is increased, thus increasing the capacitance value between them, i.e., increasing the single-point mutual capacitance value, reducing the influence of other noise, and improving the sensitivity of touch testing. The first touch trace 191, the second touch trace 192, and the second connecting bridge 15 are arranged in the same layer, reducing the overall thickness of the touch panel 10. The first touch trace 191 and the second touch trace 192 only cover the edges of the first touch electrode 11 and the second touch electrode 12, avoiding situations where the user presses the first touch electrode 11 or the second touch electrode 12 when touching the display panel, reducing the sensitivity of the touch panel 10. Furthermore, by setting the display panel to use dual-sided driving traces, the signal line impedance is reduced, improving the touch response speed.
[0063] Second Embodiment
[0064] Figure 3 This illustration shows a flowchart of a method for manufacturing a touch panel according to a second embodiment of this application.
[0065] like Figure 3 As shown in the second embodiment of this application, a method for manufacturing a touch panel is provided, the method comprising:
[0066] Step S101: Provide a substrate.
[0067] Step S102: A plurality of touch electrodes are formed on a substrate, wherein the touch electrodes include a plurality of first touch electrodes continuously distributed along a first direction and a plurality of second touch electrodes continuously distributed along a second direction. The touch electrodes also include auxiliary touch electrodes electrically connected to the first touch electrodes. The second touch electrodes are provided with a plurality of hollow portions, and the auxiliary touch electrodes are nested in the hollow portions respectively, and the auxiliary touch electrodes are spaced apart from and insulated from the edges of the hollow portions.
[0068] In this embodiment, by providing an auxiliary touch electrode electrically connected to the first touch electrode, the relative area between the auxiliary touch electrode and the second touch electrode is increased, thereby increasing the relative area between the first and second touch electrodes and increasing the capacitance value between them, i.e., increasing the single-point mutual capacitance value. Display noise has little impact on larger single-point mutual capacitance values, making it easier to detect changes in capacitance before and after touch, thus improving the accuracy of touch testing.
[0069] Third Embodiment
[0070] Figure 4 This is a schematic diagram of the structure of a display device 100 provided in the third embodiment of this application.
[0071] like Figure 4 As shown, the display device 100 includes:
[0072] The display panel 20 and the touch panel 10, as mentioned above, are located on the light-emitting side of the display panel 20 or embedded inside the display panel 20. For external display devices, the touch panel 10 is located on the light-emitting side of the display panel 20; for integrated display devices, the touch panel 10 is located inside the display panel 20.
[0073] It is understood that the display layer technical solutions provided in the embodiments of this application can be widely used in various liquid crystal display units, such as VA (Vertical Alignment) display panels and MVA (Multi-Domain Vertical Alignment) display panels.
[0074] It should be readily understood that the terms “on,” “above,” and “on top of” in this application 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).
[0075] The term "layer" as used herein can refer to a portion of material comprising a region of thickness. A layer may extend over the entire underlying or overlying structure, or may have a extent smaller than that of the underlying or overlying structure. Furthermore, a layer may be a region of a homogeneous or non-homogeneous continuous structure, with a thickness less than that of the continuous structure. For example, a layer may be located between the top and bottom surfaces of a continuous structure, or between any pairs of lateral planes at the top and bottom surfaces. A layer may extend laterally, vertically, and / or along a tapered surface. A substrate may be a layer, and may include one or more layers, and / or may have one or more layers located on, above, and / or below it. A layer may include multiple layers. For example, an interconnect layer may include one or more conductor and contact layers (forming contacts, interconnects, and / or vias therein) and one or more dielectric layers.
[0076] 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, comprising a substrate and a plurality of touch electrodes arranged on the substrate in an array, wherein the plurality of touch electrodes include a plurality of first touch electrodes continuously distributed along a first direction and a plurality of second touch electrodes continuously distributed along a second direction, wherein the first direction intersects with the second direction, and the first touch electrodes are spaced and insulated from the second touch electrodes, wherein: The touch electrode also includes an auxiliary touch electrode electrically connected to the first touch electrode. The second touch electrode is provided with a plurality of hollow portions. The plurality of auxiliary touch electrodes electrically connected to the first touch electrode around the second touch electrode are respectively nested in the hollow portions, and the auxiliary touch electrodes are spaced and insulated from edges of the hollow portions.
2. The touch panel according to claim 1, characterized in that: The first touch electrode and the second touch electrode are both rhombus-shaped, one auxiliary touch electrode is disposed at each of the four sides of the first touch electrode, and the ratio of the area of the auxiliary touch electrode to the area of the second touch electrode is less than 1 / 4.
3. The touch panel according to claim 2, characterized in that: The shape of the auxiliary touch electrode is the same as that of the first touch electrode.
4. The touch panel according to claim 1, characterized in that: It also includes a first connection bridge, a second connection bridge and an auxiliary connection bridge. Two first touch electrodes adjacent to each other along the first direction are electrically connected via the first connection bridge; two second touch electrodes adjacent to each other along the second direction are electrically connected via the second connection bridge; and the first touch electrode and the auxiliary touch electrode are electrically connected via the auxiliary connection bridge.
5. The touch panel according to claim 4, characterized in that: The touch panel also includes a first metal layer, an insulating layer, and a second metal layer formed in sequence on the base substrate; wherein the first touch electrode, the second touch electrode, the auxiliary touch electrode, the first connecting bridge, and the auxiliary connecting bridge are formed in the first metal layer, and the second connecting bridge is located in the second metal layer.
6. The touch panel according to claim 5, characterized in that: It also includes a first touch routing and a second touch routing located on the second metal layer and extending along the second direction; the insulating layer is provided with a via hole, the first touch routing is electrically connected to the first touch electrode through the via hole, and the second touch routing is electrically connected to the second touch electrode through the via hole.
7. The touch panel according to claim 6, characterized in that: The orthographic projection of part of the first touch line on the base substrate coincides with the orthographic projection of the first touch electrode on the base substrate, and the length of the first touch line of the overlapping part of the orthographic projection accounts for at least one third of the total length of the first touch line; the second touch line is arranged parallel to the second connecting bridge.
8. The touch panel according to claim 7, characterized in that: The number of the first touch control wirings is at least two, and the two first touch control wirings are electrically connected to the first touch control electrodes at two ends of the same line, respectively.
9. The touch panel according to claim 4, characterized in that: The width of the auxiliary connection bridge, the width of the first connection bridge and the width of the second connection bridge are equal.
10. A display device, characterized in that: include: Display panel, and The touch panel according to any one of claims 1 to 9, is located on the light emitting side of the display panel or is embedded inside the display panel.