Touch panel, touch device, display assembly and touch circuit
By employing an alternating arrangement of short contact control electrodes and mutual capacitance electrodes in the touch panel, the number of touch traces is reduced, solving the problems of electrode blind spots and manufacturing difficulties in self-capacitance touch panels, thereby improving touch performance and reducing costs.
Patent Information
- Application Number
- CN202210720698.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-06-22
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2042-06-22
AI Technical Summary
Existing self-capacitance touch panels suffer from poor touch performance due to the increased number of touch traces, which leads to larger blind zones between electrodes, increased bonding difficulty, lower product yield, and higher chip costs.
The touch panel design includes a first and second touch electrode that are shorted together. The number of touch traces is reduced by alternating the electrodes. A mutual capacitance electrode is set between the first electrode layer and the second electrode layer. The first and second touch traces are used to transfer self-capacitance and mutual capacitance to achieve precise positioning.
This reduces the space occupied by touch traces on the panel, improves touch performance, reduces bonding process difficulty and chip cost, and increases product yield.
Smart Images
Figure CN115167700B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of touch technology, and in particular to a touch panel, a touch device, a display component, and a touch circuit. Background Art
[0002] With the development of touch technology, touch panel technology has been applied to many scenarios as a human-computer interaction method due to its convenience, especially self-capacitive touch technology, which has been widely used in wearables, mobile phones and other fields.
[0003] To prevent ghost points and enable multi-touch, existing self-capacitive touch panels often use a one-to-one connection between touch electrodes and touch traces. That is, each touch electrode requires a touch trace, and the touch trace corresponding to each row or column of touch electrodes is connected to the touch electrode in that row or column and the touch electrode in the adjacent row or column. Therefore, higher resolution touch panels require more touch electrodes, and therefore more touch traces.
[0004] However, existing self-capacitive touch panels have more touch lines, which cause them to occupy a larger space on the panel, resulting in an increase in blind areas between electrodes, resulting in poor touch performance, increased difficulty in the bonding process, resulting in a decrease in product yield, and increased difficulty in the touch circuit chip process, resulting in increased chip costs. Summary of the Invention
[0005] The touch panel, touch device, display component and touch circuit provided in this application are intended to solve the problems of existing self-capacitive touch panels, such as the large number of touch lines that occupy a large space on the panel, resulting in an increase in the blind area between electrodes and poor touch performance, an increase in the difficulty of the bonding process, resulting in a decrease in product yield, and an increase in the difficulty of the touch circuit chip process, resulting in an increase in chip cost.
[0006] To solve the above technical problems, the first technical solution adopted by this application is to provide a touch panel. The touch panel includes:
[0007] The first electrode layer includes a plurality of touch control groups, each of which includes a short-circuited first touch control electrode and a second touch control electrode;
[0008] a second electrode layer, insulated and disposed on one side of the first electrode layer; the second electrode layer includes a first mutual capacitance electrode; the first touch electrode and the first mutual capacitance electrode are disposed correspondingly to generate a first mutual capacitance, and the second touch electrode and the first mutual capacitance electrode are disposed offset to generate no mutual capacitance;
[0009] A plurality of first touch lines corresponding one to each of the plurality of touch groups; one end of the first touch line is electrically connected to the touch group, and the other end is used to bind a touch circuit;
[0010] a second touch line; one end of the second touch line is electrically connected to the first mutual capacitance electrode, and the other end is used to bind the touch circuit.
[0011] The plurality of touch groups are arranged in an array, and the plurality of first touch electrodes are arranged in a plurality of columns spaced apart along a first direction, the plurality of second touch electrodes are arranged in a plurality of columns spaced apart along the first direction, and the plurality of first touch electrodes and the plurality of second touch electrodes are arranged in a plurality of rows spaced apart along a second direction; wherein the first direction is an extension direction of the rows of the array, and the second direction is an extension direction of the columns of the array;
[0012] Optionally, the first touch electrodes and the second touch electrodes are alternately arranged in sequence along the first direction.
[0013] Wherein, the first mutual capacitance electrode comprises:
[0014] a plurality of first extension portions arranged at intervals; the first extension portions extending along the second direction and being arranged corresponding to each column of the first touch electrodes;
[0015] A first short-circuit portion; the first short-circuit portion is disposed at the ends of the plurality of first extension portions and is connected to the ends of the first extension portions.
[0016] The second electrode layer further includes a second mutual capacitance electrode; the second mutual capacitance electrode is arranged corresponding to each column of the second touch electrodes to generate a second mutual capacitance, and the second touch electrodes in each column are staggered with the second mutual capacitance electrode to generate no mutual capacitance; the two second touch traces are electrically connected to the first mutual capacitance electrode and the second mutual capacitance electrode in a one-to-one correspondence;
[0017] Optionally, the second mutual capacitance electrode includes:
[0018] a plurality of second extension portions arranged at intervals, the second extension portions extending along the second direction and arranged corresponding to each column of the second touch electrodes; the first extension portions and the second extension portions being alternately arranged in sequence along the first direction;
[0019] a second short-circuit; the second short-circuit is arranged at the ends of the plurality of second extensions and is connected to the ends of the second extensions; and the first short-circuit is arranged on one side of the array, and the second short-circuit is arranged on a side of the array away from the first short-circuit.
[0020] Wherein, the touch group further includes a third touch electrode, and the third touch electrode is short-circuited with the second touch electrode and / or the first touch electrode;
[0021] The plurality of third touch electrodes are arranged into a plurality of columns spaced apart along the first direction, and the plurality of first touch electrodes, the plurality of second touch electrodes and the plurality of third touch electrodes are arranged into a plurality of rows spaced apart along the second direction;
[0022] Optionally, the first touch electrodes, the second touch electrodes and the third touch electrodes are alternately arranged in sequence along the first direction; the third touch electrodes are staggered with the first mutual capacitance electrodes and the second mutual capacitance electrodes so as not to generate mutual capacitance;
[0023] Optionally, the third touch electrode does not generate mutual capacitance with any mutual capacitance electrode.
[0024] The second touch electrode does not generate mutual capacitance with any mutual capacitance electrode.
[0025] The touch panel further includes an insulating layer, which is disposed between the first electrode layer and the second electrode layer, so that the first electrode layer and the second electrode layer are insulated.
[0026] To solve the above technical problems, the second technical solution adopted by this application is to provide a touch device. The touch device includes:
[0027] A touch panel, wherein the touch panel is the touch panel involved in the above technical solution;
[0028] A touch circuit is electrically connected to the first touch trace and the second touch trace, respectively, and is used to detect and output positioning information of a touch point.
[0029] To solve the above technical problems, the third technical solution adopted by this application is to provide a display component. The display component includes:
[0030] Display panel;
[0031] A touch panel is arranged on one side of the display panel; the touch panel is the touch panel involved in the above technical solution.
[0032] To solve the above technical problems, the fourth technical solution adopted by this application is to provide a touch circuit. The touch circuit is used to locate the touch point through the touch panel involved in the above technical solution; wherein, the touch circuit includes:
[0033] a first touch control unit, configured to obtain the self-capacitance of the first electrode layer;
[0034] a second touch control unit, configured to obtain a mutual capacitance between the first electrode layer and the second electrode layer;
[0035] A data processing unit is configured to obtain positioning information of the touch group corresponding to the touch point based on the self-capacitance, and to obtain positioning information of the touch electrode corresponding to the touch point based on the mutual capacitance.
[0036] The touch panel, touch device, display component and touch circuit provided in the embodiments of the present application are characterized in that the touch panel includes multiple touch groups in the first electrode layer, each touch group includes a short-circuited first touch electrode and a second touch electrode, and multiple first touch lines correspond one-to-one to the multiple touch groups, so that the first touch electrode and the second touch electrode in each touch group reuse the same first touch line, thereby reducing the number of first touch lines by half. This not only reduces the space occupied by the first touch lines on the touch panel, thereby reducing the blind area between the touch electrodes and improving the touch performance, but also avoids the problems of increased difficulty in the touch line bonding process leading to a decrease in product yield and increased difficulty in the touch circuit chip process leading to an increase in chip cost. At the same time, the touch panel is provided with a second electrode layer insulated from the first electrode layer, and the first mutual capacitance electrode of the second electrode layer is provided corresponding to the first touch electrode, so that the first touch electrode and the first mutual capacitance electrode generate a first mutual capacitance; and one end of the second touch line is connected to the first mutual capacitance electrode, and the other end is bound to the touch circuit, so that the other end of the first touch line electrically connected to the touch group at one end is also bonded to the touch circuit, so that the touch circuit can accurately locate the touch point through the self-capacitance of the touch group transmitted by the first touch line and the first mutual capacitance transmitted by the second touch line, and can achieve accurate positioning of multiple touch points. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] Figure 1 A schematic structural diagram of a touch control device provided in one embodiment of the present application;
[0038] Figure 2 A schematic structural diagram of a touch panel provided in the first embodiment of the present application;
[0039] Figure 3 for Figure 2 A schematic cross-sectional view taken along the AA line of a touch panel provided in an embodiment;
[0040] Figure 4 A schematic structural diagram of a first mutual capacitance electrode and a second mutual capacitance electrode provided in the first embodiment of the present application;
[0041] Figure 5 A schematic diagram of the positions of different touch points on the touch panel provided in the first embodiment of the present application;
[0042] Figure 6 A schematic structural diagram of a touch panel provided in the second embodiment of the present application;
[0043] Figure 7A schematic diagram of the positions of different touch points on a touch panel provided in the second embodiment of the present application;
[0044] Figure 8 A schematic structural diagram of a touch panel provided in the third embodiment of the present application;
[0045] Figure 9 A schematic diagram of the positions of different touch points on a touch panel provided in the third embodiment of the present application;
[0046] Figure 10 A schematic structural diagram of a display assembly provided in one embodiment of the present application. DETAILED DESCRIPTION
[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0048] The terms "first," "second," and "third" in this application are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of such features. In the description of this application, "multiple" means at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications in the embodiments of this application (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications also change accordingly. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products, or devices.
[0049] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0050] The present application is described in detail below with reference to the accompanying drawings and embodiments.
[0051] See also Figure 1 , Figure 1 This is a structural diagram of a touch device provided in one embodiment of the present application. This embodiment provides a touch device. The touch device includes a touch panel 1 and a touch circuit 2.
[0052] The touch panel 1 is used to receive the user's touch action and transmit the self-capacitance and / or mutual capacitance generated by the touch electrodes corresponding to the touch point to the touch circuit 2 through the touch traces. Specific details of the structure and function of the touch panel 1 are described below.
[0053] The touch circuit 2 is used to locate the touch point through the touch panel 1. Specifically, the touch circuit 2 obtains the self-capacitance and / or mutual capacitance generated by the touch electrode corresponding to the touch point through the touch trace, and then performs data processing based on the obtained self-capacitance and / or mutual capacitance to obtain the precise coordinate information of the touch point, thereby achieving the positioning of the touch point. In a specific embodiment, the touch circuit 2 includes a first touch unit 201, a second touch unit 202, and a data processing unit 203. The first touch unit 201 is used to obtain the self-capacitance generated by the touch electrode corresponding to the touch point, and the second touch unit 202 is used to obtain the mutual capacitance generated by the touch electrode corresponding to the touch point. The data processing unit 203 performs data processing based on the self-capacitance obtained by the first touch unit 201 and the mutual capacitance obtained by the second touch unit 202 to obtain the coordinate information of the touch electrode corresponding to the touch point on the touch panel 1, thereby achieving the precise positioning of the touch point.
[0054] See also Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the touch panel provided in the first embodiment of the present application. Figure 3 for Figure 2 AA cross-sectional view of a touch panel provided in an embodiment; this embodiment provides a touch panel 1 , which includes a first electrode layer, a second electrode layer, a first touch trace 41 and a second touch trace 42 .
[0055] In this embodiment, the first electrode layer includes a plurality of touch groups, and each touch group includes a short-circuited first touch electrode 11 and a second touch electrode 12. Specifically, the plurality of touch groups are arranged in an array; it should be noted here that the embodiment of the present application defines the first direction X as the extension direction of the rows in the array, and defines the second direction Y as the extension direction of the columns in the array, and this is the case in the following embodiments. In this embodiment, the plurality of touch groups are arranged in an array, and in the array, the plurality of first touch electrodes 11 are arranged into a plurality of columns spaced apart along the first direction X, and the plurality of second touch electrodes 12 are arranged into a plurality of columns spaced apart along the second direction Y; at the same time, in the array, the plurality of first touch electrodes 11 and the plurality of second touch electrodes 12 are arranged into a plurality of rows spaced apart along the second direction Y. Further, the first touch electrodes 11 and the second touch electrodes 12 are alternately arranged in sequence along the first direction X.
[0056] like Figure 2 As shown, in an array formed by a plurality of touch groups, in the first direction X, each row of touch electrodes is arranged in an alternating manner with the first touch electrodes 11 and the second touch electrodes 12; in the second direction Y, each column of touch electrodes is arranged in an alternating manner with the first touch electrodes 11 or the second touch electrodes 12; it can be seen that along the first direction X, every two touch electrodes in each row of touch electrodes form a touch group, and the two touch electrodes in each touch group are arranged in the first direction X as the first touch electrode 11 and the second touch electrode 12. Of course, in other embodiments, the touch electrodes in each row can also be arranged in an alternating manner with the second touch electrodes 12 and the first touch electrodes 11; thus, along the first direction X, every two touch electrodes in each row of touch electrodes form a touch group, and the two touch electrodes in each touch group are arranged in the first direction X as the second touch electrode 12 and the first touch electrode 11.
[0057] Specifically, in the first electrode layer, the shapes of the first touch electrode 11 and the second touch electrode 12 can be set according to actual needs. For example, the first touch electrode 11 and the second touch electrode 12 can be rectangular, square, diamond, circular, polygonal or other shapes. The first touch electrode 11 and the second touch electrode 12 can be a whole electrode or an electrode with a hollow pattern, and can be set specifically according to needs. In the embodiments of the present application, a square whole electrode is taken as an example, but it does not mean that the first touch electrode 11 and the second touch electrode 12 are limited to square whole electrodes in this application.
[0058] Among them, the multiple first touch lines 41 correspond one-to-one to the multiple touch groups, and one end of each first touch line 41 is electrically connected to the corresponding touch group. Specifically, one end of each touch line is electrically connected to the first touch electrode 11 or the second touch electrode 12 in the corresponding touch group, and the other end is used to bind the touch circuit 2, that is, the other end is electrically connected to the touch circuit 2. It is easy to understand that the number of first touch lines 41 is the same as the number of touch groups. It can be understood that the first electrode layer includes multiple first touch electrodes 11 and multiple second touch electrodes 12, and the multiple first touch electrodes 11 and the multiple second touch electrodes 12 are arranged as follows Figure 2 In the electrode array shown, in each row of the electrode array, each adjacent first touch electrode 11 and second touch electrode 12 form a touch group, and each touch group corresponds to a first touch trace 41. Compared to the method in which each touch electrode corresponds to a touch trace, the number of first touch traces 41 in this embodiment can be reduced by half. This not only reduces the space occupied by the first touch traces 41 on the touch panel 1, thereby reducing the blind area between touch electrodes and improving touch performance, but also avoids the problems of reduced product yield due to increased difficulty in the touch trace bonding process, and increased chip cost due to increased difficulty in the chip manufacturing process of the touch circuit 2.
[0059] In this embodiment, the touch panel 1 further includes a second electrode layer, which is insulated and disposed on one side of the first electrode layer. The second electrode layer includes a first mutual capacitance electrode 21 and a second mutual capacitance electrode 22. Specifically, the first touch electrode 11 and the first mutual capacitance electrode 21 are disposed in correspondence to each other to generate a first mutual capacitance, while the second touch electrode 12 and the first mutual capacitance electrode 21 are disposed in a staggered manner so as not to generate a mutual capacitance. The second touch electrode 12 and the second mutual capacitance electrode 22 are disposed in correspondence to generate a second mutual capacitance, while the first touch electrode 11 and the second mutual capacitance electrode 22 are disposed in a staggered manner so as not to generate a mutual capacitance. It should be noted that the corresponding arrangement of the first touch electrode 11 and the first mutual capacitance electrode 21 means that the projections of the first touch electrode 11 and the first mutual capacitance electrode 21 in a direction perpendicular to the touch panel 1 at least partially overlap, so that the first touch electrode 11 and the first mutual capacitance electrode 21 are opposite to each other and generate a first mutual capacitance; similarly, the corresponding arrangement of the second touch electrode 12 and the second mutual capacitance electrode 22 means that the projections of the second touch electrode 12 and the second mutual capacitance electrode 22 in a direction perpendicular to the touch panel 1 at least partially overlap, so that the second touch electrode 12 and the second mutual capacitance electrode 22 are opposite to each other and generate a second mutual capacitance.
[0060] See Figure 4 , Figure 4Schematic diagram of the structure of the first mutual capacitance electrode and the second mutual capacitance electrode provided in the first embodiment of the present application; specifically, the first mutual capacitance electrode 21 includes a plurality of first extension portions 212 arranged at intervals, and the first extension portions 212 extend along the second direction Y and are arranged corresponding to each column of the first touch electrodes 11; in this embodiment, the first extension portions 212 are elongated strips extending along the second direction Y; it is easy to understand that the projection of the portion of the elongated first extension portion 212 corresponding to the first touch electrode 11 in a direction perpendicular to the touch panel 1 at least partially overlaps with the first touch electrode 11; the shape of the elongated strip can be specifically set as needed.
[0061] The first mutual capacitance electrode 21 further includes a first short-circuit portion 211, which is disposed at the ends of the plurality of first extension portions 212 and connected to the ends of the first extension portions 212. In this embodiment, the first short-circuit portion 211 is in the shape of an elongated strip extending along the first direction X to connect to the ends of the plurality of first extension portions 212. Specifically, the plurality of first extension portions 212 and the first short-circuit portion 211 may be an integral structure.
[0062] Specifically, the second mutual capacitance electrode 22 includes a plurality of second extension portions 222 arranged at intervals, the second extension portions 222 extending along the second direction Y and being arranged corresponding to each column of the second touch electrodes 12; in the present embodiment, the second extension portions 222 are in the shape of an elongated strip extending along the second direction Y; it is easy to understand that the projection of the portion of the elongated second extension portion 222 corresponding to the second touch electrode 12 in a direction perpendicular to the touch panel 1 at least partially overlaps with the second touch electrode 12; the shape of the elongated strip can be specifically set as needed.
[0063] The second mutual capacitance electrode 22 further includes a second shorting portion 221, which is disposed at the ends of the plurality of second extension portions 222 and connected to the ends of the first extension portion 212. In this embodiment, the second shorting portion 221 is in the shape of an elongated strip extending along the first direction X to connect to the ends of the plurality of second extension portions 222. Specifically, the plurality of second extension portions 222 and the second shorting portion 221 may be an integral structure.
[0064] In this embodiment, corresponding to the arrangement of the first touch electrodes 11 and the second touch electrodes 12, the first extensions 212 and the second extensions 222 are alternately arranged along the first direction X, thereby generating a first mutual capacitance between the first touch electrodes 11 and the first extensions 212, and a second mutual capacitance between the second touch electrodes 12 and the second extensions 222 in each touch group. Furthermore, the first shorting portion 211 is disposed on one side of the array, and the second shorting portion 221 is disposed on a side of the array away from the first shorting portion 211. That is, the first shorting portion 211 and the second shorting portion 221 are respectively disposed on opposite sides of the array, so that the first mutual capacitance electrodes 21 and the second mutual capacitance electrodes 22 form an interdigitated structure. This interdigital structure allows the first mutual capacitance electrode 21 and the second mutual capacitance electrode 22 to be arranged on the same layer, thereby reducing the thickness of the touch panel 1. It also allows the first short-circuit portion 211 and the second short-circuit portion 221 to be staggered with the array, so that the first touch electrode 11 and the second touch electrode 12 do not generate mutual capacitance with the first short-circuit portion 211 and the second short-circuit portion 221, thereby avoiding interference when detecting and locating the touch point.
[0065] Furthermore, the touch panel 1 further includes an insulating layer 30, which is disposed between the first electrode layer and the second electrode layer to insulate the first electrode layer from the second electrode layer. Specifically, the insulating layer 30 can be made of polyethylene terephthalate (PET), polyimide (PI), or an inorganic material.
[0066] The first mutual capacitance electrode 21 and the second mutual capacitance electrode 22 are electrically connected to the touch circuit 2 via two second touch traces 42, respectively. Specifically, one end of the two second touch traces 42 is electrically connected to the first mutual capacitance electrode 21 and the second mutual capacitance electrode 22, respectively, and the other end is used to bind the touch circuit 2, respectively. Thus, the touch circuit 2 can detect the first mutual capacitance and the second mutual capacitance via the second touch traces 42. It can be seen that compared to the method in which each touch electrode corresponds to one touch trace, the touch panel 1 provided in this embodiment only requires half the number of first touch traces 41 and two second touch traces 42 to achieve precise positioning of the touch point, significantly reducing the number of touch traces. This not only reduces the space occupied by the touch traces on the touch panel 1, thereby reducing the blind area between touch electrodes and improving touch performance, but also avoids the problems of decreased product yield due to increased difficulty in the touch trace bonding process, and increased chip cost due to increased difficulty in the touch circuit 2 chip process.
[0067] In this embodiment, the principle of positioning detection of touch points is as follows:
[0068] First, it can be understood that when a touch object (such as a finger) touches the touch electrode (the first touch electrode 11 or the second touch electrode 12), the touched area on the touch electrode will be concave downward, causing the self-capacitance and / or mutual capacitance of the touched area to change, thereby causing the self-capacitance and / or mutual capacitance of the entire touch electrode to change. Wherein, the self-capacitance is the capacitance formed between the touch electrode and the system ground (GND) of the touch panel 1, the first touch electrode 11 and GND generate a first self-capacitance, and the second touch electrode 12 and GND generate a second self-capacitance; the mutual capacitance is the capacitance formed between the touch electrode and the corresponding mutual capacitance electrode, the first touch electrode 11 and the first mutual capacitance electrode 21 generate a first mutual capacitance, and the second touch electrode 12 and the second mutual capacitance electrode 22 generate a second mutual capacitance.
[0069] When the touch object has a large touch area and touches multiple adjacent touch electrodes, the larger the area of the touched area, the greater the change in the self-capacitance and mutual capacitance of the corresponding touch electrodes. That is, the change in the self-capacitance and mutual capacitance of the touch electrode is proportional to the area of the touched area of the touch electrode. Therefore, the data processing unit 203 of the touch circuit 2 can compare the changes in the self-capacitance and / or mutual capacitance of the multiple touch electrodes and locate the coordinate position of the touch electrode with the largest change in self-capacitance and / or mutual capacitance (i.e., the largest touched area) as the coordinate position of the touch point.
[0070] See Figure 5 , Figure 5 Schematic diagram of the positions of different touch points on the touch panel provided in the first embodiment of the present application; touch point M1 and touch point M3 corresponding to different touch groups, because they correspond to different touch groups, different touch groups correspond to different first touch traces 41, that is, the touch circuit 2 detects the self-capacitance of the corresponding touch group through different first touch traces 41, and therefore can distinguish and determine the coordinate positions of touch point M1 and touch point M3. Corresponding to the touch point M1 and touch point M2 of the same touch group, the touch point M1 corresponds to the first touch electrode 11 in the touch group, and the touch point M2 corresponds to the second touch electrode 12 in the touch group. The first touch electrode 11 and the first mutual capacitance electrode 21 form a first mutual capacitance, and the second touch electrode 12 and the second mutual capacitance electrode 22 form a second mutual capacitance. The touch circuit 2 can detect the change in the first mutual capacitance and the second mutual capacitance through the corresponding different second touch traces 42, thereby distinguishing the positions of the first touch electrode 11 and the second touch electrode 12, and therefore can distinguish and judge the coordinate positions of the touch point M1 and the touch point M2.
[0071] Specifically, the first touch control unit 201 in the touch control circuit 2 detects the self-capacitance of the first electrode layer via the first touch trace 41, namely, the first self-capacitance corresponding to the first touch electrode 11 and the second self-capacitance corresponding to the second touch electrode 12 in the first electrode layer, thereby enabling the data processing unit 203 to obtain the change in the self-capacitance of the corresponding touch group. The second touch control unit 202 in the touch control circuit 2 detects the mutual capacitance between the first and second electrode layers via the second touch trace 42, namely, the first mutual capacitance formed between the first touch electrode 11 and the first mutual capacitance electrode 21 and the second mutual capacitance formed between the second touch electrode 12 and the second mutual capacitance electrode 22, thereby enabling the data processing unit 203 to obtain the change in the first and second mutual capacitances. Based on the obtained change in self-capacitance, the data processing unit 203 determines the touch group corresponding to the touch point, and based on the change in the first and second mutual capacitances, determines the touch electrode corresponding to the touch point, thereby obtaining positioning information of the touch electrode corresponding to the touch point.
[0072] See Figure 6 , Figure 6 This is a schematic diagram of the structure of a touch panel provided in a second embodiment of the present application. This embodiment provides a second touch panel 1. Unlike the first embodiment, each touch group of the touch panel 1 further includes a third touch electrode 13, and the third touch electrode 13 is short-circuited with the first touch electrode 11 and / or the second touch electrode 12. Specifically, the plurality of third touch electrodes 13 are arranged in a plurality of columns spaced apart along a first direction X, and the plurality of first touch electrodes 11, the plurality of second touch electrodes 12, and the plurality of third touch electrodes 13 are arranged in a plurality of rows spaced apart along a second direction Y.
[0073] In a specific embodiment, the first touch electrodes 11, the second touch electrodes 12, and the third touch electrodes 13 are alternately arranged in sequence along the first direction X. The arrangement order of the first touch electrodes 11, the second touch electrodes 12, and the third touch electrodes 13 along the first direction X can be set as needed; for example, in this embodiment, the arrangement order of the touch electrodes in each touch group is the first touch electrode 11, the third touch electrode 13, and the second touch electrode 12; in each row of the array, the first touch electrodes 11, the third touch electrodes 13, and the second touch electrodes 12 are alternately arranged in this order.
[0074] Specifically, the third touch electrode 13 is staggered with the first mutual capacitance electrode 21 and the second mutual capacitance electrode 22, and does not generate mutual capacitance. Furthermore, the third touch electrode 13 does not generate mutual capacitance with any mutual capacitance electrodes. It is understood that the third touch electrode 13 forms a third self-capacitance only with the system ground GND of the touch panel 1, and does not generate mutual capacitance with other mutual capacitance electrodes, thereby avoiding interference during touch point positioning detection.
[0075] Compared with the first embodiment, the touch panel 1 provided by this embodiment has three touch electrodes forming a touch group, that is, one first touch line 41 is reused for every three touch electrodes, so that the number of first touch lines 41 of the touch panel 1 is further reduced, and the space occupied by the touch lines on the touch panel 1 is further reduced, thereby reducing the blind area between the touch electrodes, effectively improving the touch performance, and further effectively avoiding the problems of decreased product yield due to increased difficulty in the touch line bonding process and increased chip cost due to increased difficulty in the touch circuit 2 chip process.
[0076] Optionally, the first electrode layer and the second electrode layer are both made of metal or transparent metal conductive oxide. Specifically, the metal may include one or more of molybdenum (Mo), aluminum (Al), copper (Cu), titanium (Ti), and chromium (Cr); and the transparent metal conductive oxide may be indium tin oxide (ITO).
[0077] Optionally, there is insulation between the first electrode layer and the second electrode layer, or an insulating layer 30 is set between the first electrode layer and the second electrode layer. The material of the insulating layer 30 can be an elastic insulating material, such as rubber, or the insulating material such as PET, PI, inorganic matter, etc. described in the above embodiments.
[0078] See Figure 7 , Figure 7 Schematic diagram of the positions of different touch points on the touch panel provided in the second embodiment of the present application; corresponding to touch point P1, touch point P2 and touch point P3, the touch electrodes corresponding to the three touch points form respective self-capacitances with the system ground terminal GND, touch point P1 forms a first mutual capacitance with the corresponding first mutual capacitance electrode 21, touch point P3 forms a second mutual capacitance with the corresponding second mutual capacitance electrode 22, and touch point P2 has no mutual capacitance. Because the first touch electrode 11, the second touch electrode 12 and the third touch electrode 13 are short-circuited, the respective self-capacitances formed by the three touch electrodes and the system ground terminal GND are the same, but the first mutual capacitance formed by the first touch electrode 11 and the first mutual capacitance electrode 21 and the second mutual capacitance formed by the second touch electrode 12 and the second mutual capacitance electrode 22 are different, and the third touch electrode 13 has no mutual capacitance. Therefore, the touch electrode corresponding to the touch point can be distinguished by mutual capacitance.
[0079] In a specific embodiment, when touch point P1 and touch point P2 are touched simultaneously, a first mutual capacitance formed between the first touch electrode 11 corresponding to touch point P1 and the first mutual capacitance electrode 21 changes, and the touch circuit 2 obtains the change in the first mutual capacitance. Since the change in the mutual capacitance is proportional to the area of the touched region of the touch point, the data processing unit 203 can determine the touch position by the change in the first mutual capacitance. For example, when the change in the first mutual capacitance is less than a preset threshold, that is, the area of the touched region of the first touch electrode 11 corresponding to touch point P1 is small, the touch position is determined to be touch point P2; when the change in the first mutual capacitance is greater than the preset threshold, that is, the area of the touched region of the first touch electrode 11 corresponding to touch point P1 is large, the touch position is determined to be touch point P1.
[0080] See Figure 8 , Figure 8 This is a schematic structural diagram of the touch panel provided in the third embodiment of the present application; this embodiment provides a third touch panel 1, which is different from the first embodiment in that the second touch electrode 12 in each touch group in the touch panel 1 does not generate mutual capacitance with any mutual capacitance electrode. Specifically, each touch group of the touch panel 1 includes a short-circuited first touch electrode 11 and a second touch electrode 12; the second electrode layer includes a first mutual capacitance electrode 21, the first touch electrode 11 and the first mutual capacitance electrode 21 are arranged correspondingly to generate a first mutual capacitance, and the second touch electrode 12 and the first mutual capacitance electrode 21 are staggered and do not generate mutual capacitance. In this embodiment, the structure and arrangement of the first touch electrode 11 and the second touch electrode 12 in the first electrode layer are the same or similar to those in the first embodiment, and the structure, shape and other characteristics of the first mutual capacitance electrode 21 are also the same or similar to those in the first embodiment. For details, please refer to the above and will not be repeated here.
[0081] Compared with the method in which each touch electrode corresponds to a touch trace, the touch panel 1 provided in this embodiment only requires half the number of first touch traces 41 and two second touch traces 42 to achieve precise positioning of the touch point, which greatly reduces the number of touch traces. It can not only reduce the space occupied by the touch traces on the touch panel 1, thereby reducing the blind area between the touch electrodes and improving the touch performance, but also avoid the problems of increased difficulty in the touch trace bonding process leading to a decrease in product yield and increased chip cost due to increased difficulty in the touch circuit 2 chip process.
[0082] See Figure 9 , Figure 9A schematic diagram of the positions of different touch points on the touch panel provided in the third embodiment of the present application; corresponding to touch point P4 and touch point P5, touch point P4 corresponds to the first touch electrode 11, and touch point P5 corresponds to the second touch electrode 12. Since the first touch electrode 11 and the second touch electrode 12 are short-circuited, the self-capacitance generated by each of them and the system ground terminal GND is the same, but the first touch electrode 11 and the first mutual capacitance electrode 21 form a first mutual capacitance, and the second touch electrode 12 has no mutual capacitance. The touch circuit 2 can distinguish the first touch electrode 11 and the second touch electrode 12 based on the first mutual capacitance.
[0083] Specifically, when the touch point P4 and / or the touch point P5 is touched, the corresponding first self-capacitance and / or the second self-capacitance will change, and the first mutual capacitance generated by the corresponding first touch electrode 11 and the first mutual capacitance electrode 21 will also change at the same time. The touch circuit 2 locates the touch position according to the obtained change in self-capacitance and mutual capacitance. The specific positioning principle is the same or similar to the positioning principle of the touch point involved in the first and second embodiments, and will not be repeated here.
[0084] See Figure 10 , Figure 10 This is a schematic diagram of the structure of a display assembly provided in one embodiment of the present application. This embodiment provides a display assembly comprising a display panel 3 and a touch panel 1. The touch panel 1 is disposed on one side of the display panel 3, specifically on the display surface of the display panel 3. The touch panel 1 can be used as an input device for human-computer interaction, and input commands inputted to the touch panel 1 can be displayed via the display panel 3. It will be understood that the touch panel 1 is generally made of a transparent material so that the image displayed on the display panel 3 can be seen through the touch panel 1. Specifically, the display panel 3 can be any display panel 3 known in the art.
[0085] The touch panel 1 is the touch panel 1 provided in any of the above embodiments. Specifically, the touch panel 1 is connected to the touch circuit 2 via a first touch trace 41 and a second touch trace 42. The touch circuit 2 can be provided in a control module of a driver substrate. In a specific embodiment, the display panel 3 and the touch panel 1 can be connected together to the driver substrate to achieve human-computer interaction.
[0086] The above description is only an implementation method of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A touch panel, characterized in that: include: The first electrode layer includes a plurality of touch control groups, each of which includes a short-circuited first touch control electrode and a second touch control electrode; a second electrode layer, insulated and disposed on one side of the first electrode layer; the second electrode layer includes a first mutual capacitance electrode; the first touch electrode and the first mutual capacitance electrode are disposed correspondingly to generate a first mutual capacitance, and the second touch electrode and the first mutual capacitance electrode are disposed offset to generate no mutual capacitance; A plurality of first touch lines corresponding one to each of the plurality of touch groups; one end of the first touch line is electrically connected to the touch group, and the other end is used to bind a touch circuit; a second touch line; one end of the second touch line is electrically connected to the first mutual capacitance electrode, and the other end is used to bind the touch circuit; The first mutual capacitance electrode comprises: a plurality of first extension portions arranged at intervals; the first extension portions extending along the second direction and being arranged corresponding to each column of the first touch electrodes; A first short-circuit portion; the first short-circuit portion is disposed at the ends of the plurality of first extension portions and is connected to the ends of the first extension portions.
2. The touch panel according to claim 1, wherein: The plurality of touch groups are arranged in an array, and the plurality of first touch electrodes are arranged into a plurality of columns spaced apart along a first direction, the plurality of second touch electrodes are arranged into a plurality of columns spaced apart along the first direction, and the plurality of first touch electrodes and the plurality of second touch electrodes are arranged into a plurality of rows spaced apart along the second direction; wherein the first direction is an extension direction of the rows of the array, and the second direction is an extension direction of the columns of the array.
3. The touch panel according to claim 2, wherein: The first touch electrodes and the second touch electrodes are alternately arranged in sequence along the first direction.
4. The touch panel according to claim 2, wherein: The second electrode layer also includes a second mutual capacitance electrode; the second mutual capacitance electrode is arranged corresponding to each column of the second touch electrodes to generate a second mutual capacitance, and the first touch electrodes and the second mutual capacitance electrodes in each column are staggered to not generate mutual capacitance; the two second touch traces are electrically connected to the first mutual capacitance electrode and the second mutual capacitance electrode in a one-to-one correspondence.
5. The touch panel according to claim 4, wherein: The second mutual capacitance electrode comprises: a plurality of second extension portions arranged at intervals, the second extension portions extending along the second direction and arranged corresponding to each column of the second touch electrodes; the first extension portions and the second extension portions being alternately arranged in sequence along the first direction; a second short-circuit; the second short-circuit is arranged at the ends of the plurality of second extensions and is connected to the ends of the second extensions; and the first short-circuit is arranged on one side of the array, and the second short-circuit is arranged on a side of the array away from the first short-circuit.
6. The touch panel according to claim 4, wherein: The touch group further includes a third touch electrode, and the third touch electrode is short-circuited with the second touch electrode and / or the first touch electrode; The plurality of third touch electrodes are arranged into a plurality of columns spaced apart along the first direction, and the plurality of first touch electrodes, the plurality of second touch electrodes and the plurality of third touch electrodes are arranged into a plurality of rows spaced apart along the second direction.
7. The touch panel according to claim 6, wherein: The first touch electrodes, the second touch electrodes and the third touch electrodes are alternately arranged in sequence along the first direction; the third touch electrodes are staggered with the first mutual capacitance electrodes and the second mutual capacitance electrodes so as not to generate mutual capacitance.
8. The touch panel according to claim 6, wherein: The third touch electrode does not generate mutual capacitance with any mutual capacitance electrode.
9. The touch panel according to claim 1, wherein: The second touch electrode does not generate mutual capacitance with any mutual capacitance electrode.
10. The touch panel according to claim 1, wherein: The touch panel further includes an insulating layer, which is disposed between the first electrode layer and the second electrode layer so as to insulate the first electrode layer from the second electrode layer.
11. A touch device, characterized in that: include: A touch panel, wherein the touch panel is the touch panel according to any one of claims 1 to 10; A touch circuit is electrically connected to the first touch trace and the second touch trace, respectively, and is used to detect and output positioning information of a touch point.
12. A display component, characterized in that: include: Display panel; A touch panel is arranged on one side of the display panel; the touch panel is the touch panel according to any one of claims 1 to 10.
13. A touch circuit for locating a touch point using the touch panel according to any one of claims 1 to 10; characterized in that: The touch control circuit includes: a first touch control unit, configured to obtain the self-capacitance of the first electrode layer; a second touch control unit, configured to obtain a mutual capacitance between the first electrode layer and the second electrode layer; A data processing unit is configured to obtain positioning information of the touch group corresponding to the touch point based on the self-capacitance, and to obtain positioning information of the touch electrode corresponding to the touch point based on the mutual capacitance.
Citation Information
Patent Citations
Touch screen, touch positioning method and display device
CN114115613A