Capacitive touch screen, smart tablet and touch detection method

Abstract

The embodiment of the application discloses a capacitive touch screen, a smart tablet and a touch detection method. The capacitive touch screen comprises a cover plate, a driving electrode layer, a first sensing electrode layer and a second sensing electrode layer. The first sensing electrode layer is arranged between the cover plate and the driving electrode layer. The driving electrode layer is arranged between the first sensing electrode layer and the second sensing electrode layer. The first sensing mechanism formed by the first sensing electrode layer and the driving electrode layer is used for sensing a first touch signal. The second sensing mechanism formed by the second sensing electrode layer and the driving electrode layer is used for sensing a second touch signal. The touch signal corresponding to a touch operation is obtained by superimposing the first touch signal and the second touch signal. The technical problem of inaccurate detection of the capacitive touch screen can be solved, and the accuracy of touch position detection is improved.

Description

Technical Field

[0001] This application relates to the field of capacitive touch technology, and in particular to a capacitive touch screen, a smart tablet, and a touch detection method. Background Technology

[0002] With the rapid development of smartphones and tablets, touchscreens have become widely used in daily life. Due to their ease of operation and high sensitivity, capacitive touchscreens have become the preferred choice for touch devices. Capacitive touchscreens primarily work by recognizing finger touch points and accurately calculating the position information of the touch point by acquiring the capacitance changes of the electrodes along the X-axis and Y-axis.

[0003] In capacitive touchscreens, a driving electrode layer and a sensing electrode layer are typically provided. If the sensing electrode layer is located near the contact surface, i.e., the display panel, it is not easy to detect screen interference, which can lead to problems such as inaccurate touch position detection or detection delay. If the sensing electrode layer is located near the display panel, i.e., far from the contact surface, the sensed touch signal is weak, which can also lead to inaccurate touch position detection. Summary of the Invention

[0004] This application provides a capacitive touchscreen, a smart tablet, and a touch detection method, which can solve the technical problem of inaccurate detection of capacitive touchscreens and improve the accuracy of touch position detection.

[0005] In a first aspect, embodiments of this application provide a capacitive touchscreen, including a cover plate, a driving electrode layer, a first sensing electrode layer, and a second sensing electrode layer;

[0006] The first sensing electrode layer is disposed between the cover plate and the driving electrode layer;

[0007] The driving electrode layer is disposed between the first sensing electrode layer and the second sensing electrode layer;

[0008] The first sensing mechanism, composed of the first sensing electrode layer and the driving electrode layer, is used to sense the first touch signal. The second sensing mechanism, composed of the second sensing electrode layer and the driving electrode layer, is used to sense the second touch signal. The touch signal corresponding to the touch operation is obtained by superimposing the first touch signal and the second touch signal.

[0009] As described above, by setting a first sensing electrode layer and a second sensing electrode layer, the touch signal corresponding to the touch operation is a superposition of the first touch signal and the second touch signal based on the setting of the two sensing electrode layers. This increases the signal quantity of the total touch signal detected, thereby improving the accuracy and sensitivity of touch position detection, and thus improving the accuracy of touch operation sensing. Furthermore, based on the setting of the two sensing electrode layers, the accuracy of interference detection can be improved, thereby improving the accuracy of the operating frequency to avoid interference, further improving the accuracy of touch position detection, and thus improving the overall user experience.

[0010] In one embodiment, the driving electrode layer includes driving electrodes arranged along a first direction, the first sensing electrode layer includes first sensing electrodes arranged along a second direction, and the second sensing electrode layer includes second sensing electrodes arranged along a second direction.

[0011] The first direction is perpendicular to the second direction.

[0012] As described above, by setting the first direction corresponding to the driving electrode and the second direction corresponding to the sensing electrode (i.e., the first sensing electrode and the second sensing electrode) to be perpendicular to each other, a two-dimensional network can be formed. When a touch operation occurs, the position point of the touch operation on the touch surface can be determined according to the two-dimensional network, thereby determining the accuracy and comprehensiveness of touch detection.

[0013] In one embodiment, the positions and numbers of the first sensing electrode and the second sensing electrode correspond.

[0014] As described above, by matching the positions and numbers of the first and second sensing electrodes, the corresponding touch signals during a touch operation are all superimposed on the first and second touch signals, thereby improving the comprehensiveness and accuracy of touch detection.

[0015] In one embodiment, the position and number of the second sensing electrode correspond to the odd-numbered columns of the first sensing electrode in the first sensing electrode layer;

[0016] Alternatively, the position and number of the second sensing electrode correspond to the even-numbered columns of the first sensing electrode in the first sensing electrode layer.

[0017] As described above, based on the premise that the number and position layout of the first sensing electrodes meet the requirements for comprehensive detection, the second sensing electrode is set to correspond to the position and number of the first sensing electrodes in the odd or even columns of the first sensing electrode layer. The interference value that the second sensing electrode layer can detect is more accurate, thereby improving the accuracy of interference detection, which in turn improves the accuracy of the working frequency to avoid interference, and further enhances the accuracy of touch position detection.

[0018] In one embodiment, the capacitive touchscreen further includes a sensing bus, a driving bus, and a control module;

[0019] The driving electrodes are connected sequentially along a first direction via a first wire, and one end of the first wire is connected to the first end of the driving bus.

[0020] The first sensing electrode is connected in sequence along the second direction via the second wire, and the second sensing electrode is connected in sequence along the second direction via the third wire;

[0021] The second and third wires at corresponding positions are connected at one end, and then connected to the first end of the sensing bus through a wire.

[0022] The second end of the drive bus and the second end of the sensing bus are connected to the control module.

[0023] The connection settings of the drive bus and the sensing bus described above can ensure the accuracy and reliability of touch detection for capacitive touchscreens.

[0024] In one embodiment, the control module includes a drive module, a sensing module, and a main control module;

[0025] The first end of the driver module is connected to the second end of the driver bus, and the second end of the driver module is connected to the main control module.

[0026] The first end of the sensing module is connected to the second end of the sensing bus, and the second end of the sensing module is connected to the main control module.

[0027] The main control module is used to send drive signals to the drive electrode layer through the drive module, and to receive touch signals detected by the first and second sensing electrode layers through the sensing module, and to determine the touch position point and touch interference value based on the received touch signals.

[0028] In one embodiment, the capacitive touchscreen further includes a glass substrate;

[0029] The first sensing electrode layer is disposed between the cover plate and the glass substrate;

[0030] The driving electrode layer is disposed between the glass substrate and the second sensing electrode layer, and is attached to the second sensing electrode layer by adhesive.

[0031] As described above, by setting a first sensing electrode layer and a second sensing electrode layer, the touch signal corresponding to the touch operation is a superposition of the first touch signal and the second touch signal based on the setting of the two sensing electrode layers. This increases the signal quantity of the total touch signal detected, thereby improving the accuracy and sensitivity of touch position detection, and thus improving the accuracy of touch operation sensing. Furthermore, based on the setting of the two sensing electrode layers, the accuracy of interference detection can be improved, thereby improving the accuracy of the operating frequency to avoid interference, further improving the accuracy of touch position detection, and thus improving the overall user experience.

[0032] In one embodiment, the capacitive touchscreen further includes a first polymer material substrate and a second polymer material substrate;

[0033] The first sensing electrode layer is disposed between the cover plate and the first polymer material substrate;

[0034] The driving electrode layer is disposed between the first polymer substrate and the second polymer substrate.

[0035] The second sensing electrode layer is attached to the second polymer material substrate by adhesive.

[0036] As described above, by setting a first sensing electrode layer and a second sensing electrode layer, the touch signal corresponding to the touch operation is a superposition of the first touch signal and the second touch signal based on the setting of the two sensing electrode layers. This increases the signal quantity of the total touch signal detected, thereby improving the accuracy and sensitivity of touch position detection, and thus improving the accuracy of touch operation sensing. Furthermore, based on the setting of the two sensing electrode layers, the accuracy of interference detection can be improved, thereby improving the accuracy of the operating frequency to avoid interference, further improving the accuracy of touch position detection, and thus improving the overall user experience.

[0037] In one embodiment, the first sensing electrode layer and the driving electrode layer are deposited on the interface between the cover plate and the first sensing electrode layer through a micron-scale multilayer structure;

[0038] The driving electrode layer is attached to the second sensing electrode layer by adhesive.

[0039] As described above, by setting a first sensing electrode layer and a second sensing electrode layer, the touch signal corresponding to the touch operation is a superposition of the first touch signal and the second touch signal based on the setting of the two sensing electrode layers. This increases the signal quantity of the total touch signal detected, thereby improving the accuracy and sensitivity of touch position detection, and thus improving the accuracy of touch operation sensing. Furthermore, based on the setting of the two sensing electrode layers, the accuracy of interference detection can be improved, thereby improving the accuracy of the operating frequency to avoid interference, further improving the accuracy of touch position detection, and thus improving the overall user experience.

[0040] In a second aspect, embodiments of this application provide a smart tablet, including the capacitive touchscreen described above.

[0041] In a third aspect, embodiments of this application provide a touch detection method for the smart tablet described in the second aspect, comprising:

[0042] The touch signal is received and is obtained by superimposing the first touch signal sensed by the first sensing electrode layer and the second touch signal sensed by the second sensing electrode layer.

[0043] Determine the touch location and touch interference value based on the touch signal;

[0044] The system performs corresponding interactive operations based on the touch location and adjusts the operating frequency of the drive sensor based on the touch interference value.

[0045] As described above, in a capacitive display screen, by setting up two layers of sensing electrodes, the touch signal corresponding to a touch operation is a superposition of the first touch signal and the second touch signal. Therefore, the signal quantity of the touch signal received by the main control module is increased. The main control module processes and analyzes the touch signal with a higher signal quantity, which can improve the detection accuracy of touch position points and touch interference values. Based on the improved detection accuracy of touch interference values, the accuracy of the operating frequency to avoid interference can be improved, thereby improving the overall accuracy of touch position detection. Therefore, it can improve the user's touch experience. Attached Figure Description

[0046] Figure 1 This is a first schematic diagram of a capacitive touchscreen provided in an embodiment of this application;

[0047] Figure 2 This is a second schematic diagram of a capacitive touchscreen provided in an embodiment of this application;

[0048] Figure 3 This is a third schematic diagram of a capacitive touchscreen provided in an embodiment of this application;

[0049] Figure 4 This is a fourth schematic diagram of a capacitive touchscreen provided in an embodiment of this application;

[0050] Figure 5 This is a fifth schematic diagram of a capacitive touchscreen provided in an embodiment of this application;

[0051] Figure 6 This is a schematic diagram of an equivalent circuit for touch operation provided in an embodiment of this application;

[0052] Figure 7 This is a flowchart of a touch detection method provided in an embodiment of this application. Detailed Implementation

[0053] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0054] Capacitive touchscreens primarily work by recognizing finger touch points and accurately calculating the position information of the touch point by acquiring the capacitance changes of the electrodes along the X-axis and Y-axis directions.

[0055] In capacitive touchscreens, a driving electrode layer and a sensing electrode layer are typically provided. If the sensing electrode layer is located near the contact surface, i.e., the display panel, it is not easy to detect screen interference, which can lead to problems such as inaccurate touch position detection or detection delay. If the sensing electrode layer is located near the display panel, i.e., far from the contact surface, the sensed touch signal is weak, which can also lead to inaccurate touch position detection.

[0056] Based on this, the embodiments of this application provide a capacitive touchscreen by setting a first sensing electrode layer near the contact surface, a second sensing electrode layer near the display panel, and a driving electrode layer between the first and second sensing electrode layers. A first sensing mechanism composed of the first and driving electrode layers is used to sense a first touch signal, and a second sensing mechanism composed of the second and driving electrode layers is used to sense a second touch signal. When a touch operation occurs on the contact surface, the touch signal corresponding to the touch operation is obtained by superimposing the first and second touch signals. Compared to the related technologies that only have one sensing electrode layer, the two sensing electrode layers provided in this embodiment, with the first sensing electrode layer near the contact surface, can improve the accuracy of touch operation sensing, thereby improving the accuracy of touch position detection; and with the second sensing electrode layer near the display panel, can improve the accuracy of interference detection, thereby improving the accuracy of the operating frequency to avoid interference, and thus improving the overall accuracy of touch position detection. Furthermore, by setting up two layers of sensing electrodes, the touch signal corresponding to the touch operation is the superposition of the first touch signal and the second touch signal, which increases the signal quantity of the total touch signal detected, thereby improving the accuracy and sensitivity of touch position detection, and thus enhancing the overall user experience.

[0057] Figure 1 This is a first schematic diagram of a capacitive touchscreen provided in an embodiment of this application, referring to... Figure 1This embodiment uses a capacitive touchscreen with a G+G structure as an example for explanation. The capacitive touchscreen includes a cover plate 10, a first sensing electrode layer 20, a glass substrate 30, a driving electrode layer 40, and a second sensing electrode layer 50. The first sensing electrode layer 20 is disposed between the cover plate 10 and the glass substrate 30, with the side of the cover plate 10 opposite to the first sensing electrode layer 20 serving as the contact surface for touch operation. For example, the first sensing electrode layer 20 is attached between the cover plate 10 and the glass substrate 30 using adhesive. The driving electrode layer 40 is disposed between the glass substrate 30 and the second sensing electrode layer 50, and is attached to the second sensing electrode layer 50 using adhesive. The first sensing mechanism formed by the first sensing electrode layer 20 and the driving electrode layer 40 is used to sense a first touch signal, and the second sensing mechanism formed by the second sensing electrode layer 50 and the driving electrode layer 40 is used to sense a second touch signal. The touch signal corresponding to the touch operation is obtained by superimposing the first touch signal and the second touch signal.

[0058] Figure 2 This is a second schematic diagram of a capacitive touchscreen provided in an embodiment of this application, referring to... Figure 2 This embodiment uses a capacitive touchscreen with a G+FF structure as an example for explanation. The capacitive touchscreen includes a cover plate 10, a first sensing electrode layer 20, a driving electrode layer 40, a second sensing electrode layer 50, a first polymer substrate 60, and a second polymer substrate 70. The first sensing electrode layer 20 is disposed between the cover plate 10 and the first polymer substrate 60, with the side of the cover plate 10 opposite to the first sensing electrode layer 20 serving as the contact surface for touch operation. The driving electrode layer 40 is disposed between the first polymer substrate 60 and the second polymer substrate 70. The second sensing electrode layer 50 is attached to the second polymer substrate 70 using adhesive. The first sensing mechanism formed by the first sensing electrode layer 20 and the driving electrode layer 40 is used to sense a first touch signal, and the second sensing mechanism formed by the second sensing electrode layer 50 and the driving electrode layer 40 is used to sense a second touch signal. The touch signal corresponding to the touch operation is obtained by superimposing the first touch signal and the second touch signal.

[0059] Figure 3 This is a third schematic diagram of a capacitive touchscreen provided in an embodiment of this application, referring to... Figure 3This embodiment uses a capacitive touchscreen with an OGM / OGS structure as an example for explanation. The capacitive touchscreen includes a cover plate 10, a driving electrode layer 40, a first sensing electrode layer 20, and a second sensing electrode layer 50. The first sensing electrode layer 20 is disposed between the cover plate 10 and the driving electrode layer 40, with the side of the cover plate 10 opposite to the first sensing electrode layer 20 serving as the contact surface for touch operation. The driving electrode layer 40 is disposed between the first sensing electrode layer 20 and the second sensing electrode layer 50. The first sensing electrode layer 20 and the driving electrode layer 40 are deposited on the interface between the cover plate 10 and the first sensing electrode layer 20 using a micron-level multilayer structure. The driving electrode layer 40 is attached to the second sensing electrode layer 50 using adhesive. The first sensing mechanism formed by the first sensing electrode layer 20 and the driving electrode layer 40 is used to sense a first touch signal, and the second sensing mechanism formed by the second sensing electrode layer 50 and the driving electrode layer 40 is used to sense a second touch signal. The touch signal corresponding to the touch operation is obtained by superimposing the first touch signal and the second touch signal.

[0060] For example, when the capacitive touchscreen has an OGM structure, the material plated in the multi-layer structure is a metal mesh material; when the capacitive touchscreen has an OGS structure, the material plated in the multi-layer structure is an ITO material.

[0061] In one embodiment, the second sensing electrode layer 50 is attached to a glass substrate or a third polymer material substrate (i.e., ...) by an adhesive. Figure 1-3 (80) of them.

[0062] The cover plate 10 can be a glass cover plate, a PMMA (polymethyl methacrylate) cover plate, or a PET (polyethylene terephthalate) cover plate. The bonding adhesive includes OCA optical adhesive, silicone (SCA / AB silicone), acrylic adhesive, or polyurethane adhesive.

[0063] This embodiment provides a capacitive touchscreen, including a cover plate, a driving electrode layer, a first sensing electrode layer, and a second sensing electrode layer. The first sensing electrode layer is disposed between the cover plate and the driving electrode layer; the driving electrode layer is disposed between the first sensing electrode layer and the second sensing electrode layer. A first sensing mechanism formed by the first sensing electrode layer and the driving electrode layer is used to sense a first touch signal, and a second sensing mechanism formed by the second sensing electrode layer and the driving electrode layer is used to sense a second touch signal. The touch signal corresponding to the touch operation is obtained by superimposing the first touch signal and the second touch signal. It is applicable to various capacitive touchscreens such as G+G structure, G+FF structure, and OGM / OGS structure.

[0064] As described above, in a capacitive touchscreen, a first sensing electrode layer 20 is disposed near the contact surface, a second sensing electrode layer 50 is disposed near the display panel, and a driving electrode layer 40 is disposed between the first sensing electrode layer 20 and the second sensing electrode layer 50. The first sensing mechanism formed by the first sensing electrode layer 20 and the driving electrode layer 40 is used to sense a first touch signal, and the second sensing mechanism formed by the second sensing electrode layer 50 and the driving electrode layer 40 is used to sense a second touch signal. When a touch operation occurs on the contact surface, the touch signal corresponding to the touch operation is obtained by superimposing the first touch signal and the second touch signal. Compared with the related technology that only a single sensing electrode layer is disposed, the two sensing electrode layers provided in this embodiment, with the first sensing electrode layer 20 disposed near the contact surface, can improve the accuracy of sensing touch operations, thereby improving the accuracy of touch position detection; and with the second sensing electrode layer 50 disposed near the display panel, can improve the accuracy of detecting interference, thereby improving the accuracy of the operating frequency to avoid interference, and thus improving the overall accuracy of touch position detection. Furthermore, by setting up two layers of sensing electrodes, the touch signal corresponding to the touch operation is the superposition of the first touch signal and the second touch signal, which increases the signal quantity of the total touch signal detected, thereby improving the accuracy and sensitivity of touch position detection, and thus enhancing the overall user experience.

[0065] Figure 4 This is a fourth schematic diagram of a capacitive touchscreen provided in an embodiment of this application, referring to... Figure 1-4In the capacitive touchscreen provided in this embodiment, the driving electrode layer 40 includes driving electrodes 401 arranged along a first direction, the first sensing electrode layer 20 includes first sensing electrodes 201 arranged along a second direction, and the second sensing electrode layer 50 includes second sensing electrodes 501 arranged along a second direction. The first direction and the second direction are perpendicular. Specifically, the first direction can be horizontal, in which case the second direction is vertical; or the first direction can be vertical, in which case the second direction is horizontal; or the first direction is at a certain angle to a horizontal or vertical reference line, in which case the second direction is perpendicular to the first direction, meaning the second direction also has an angle to the horizontal or vertical reference line. For example, if the first direction has a 30° angle to the horizontal reference line, then the second direction has a 120° angle to the horizontal reference line, thus the first and second directions are perpendicular to each other. The intersection points of the driving electrode 401 and the first sensing electrode 201, as well as the intersection points of the driving electrode 401 and the second sensing electrode 501, are collectively referred to as nodes. A node is not the actual connection point between the driving electrode 401 and the sensing electrode (i.e., the first sensing electrode 201 or the second sensing electrode 501), but rather the intersection point of their projected images. Based on the driving signal transmitted by the driving electrode 401, at each node, the sensing electrode (i.e., the first sensing electrode 201 or the second sensing electrode 501) can sense (receive) the corresponding touch signal (e.g., capacitance). When the sensed touch signal changes, it indicates that a touch operation has occurred. Therefore, by setting the first direction corresponding to the driving electrode 401 and the second direction corresponding to the sensing electrode (i.e., the first sensing electrode 201 and the second sensing electrode 501) to be perpendicular to each other, a two-dimensional network can be constructed. When a touch operation occurs, the position point of the touch operation on the touch surface can be determined according to this two-dimensional network, thereby determining the accuracy and comprehensiveness of touch detection.

[0066] In this embodiment, the first direction is horizontal and the second direction is vertical, which is used as an example for explanation. The total number of rows of driving electrodes and the total number of columns of the first sensing electrode and the second sensing electrode can be set according to actual conditions, and are not limited in this embodiment.

[0067] In one embodiment, the positions and numbers of the first and second sensing electrodes correspond. This is achieved by setting the positions and numbers of the first and second sensing electrode layers to be identical, meaning the number of first and second sensing electrodes is the same, and each first sensing electrode and its corresponding second sensing electrode overlap in projection. For example, Figure 4In the first column, the number of first sensing electrodes 201 and the number of second sensing electrodes 501 are the same, and their positions are opposite. As described above, the first sensing mechanism, composed of the first sensing electrode layer and the driving electrode layer, senses the first touch signal, and the second sensing mechanism, composed of the second sensing electrode layer and the driving electrode layer, senses the second touch signal. By corresponding the positions and numbers of the first and second sensing electrodes, when a touch operation occurs on the contact surface, the corresponding touch signal is always a superposition of the first and second touch signals, thereby improving the comprehensiveness and accuracy of touch detection.

[0068] In one embodiment, the second sensing electrode corresponds to the position and number of the first sensing electrodes in the odd-numbered columns of the first sensing electrode layer. Alternatively, the second sensing electrode corresponds to the position and number of the first sensing electrodes in the even-numbered columns of the first sensing electrode layer. As described above, the first sensing mechanism, composed of the first sensing electrode layer and the driving electrode layer, senses the first touch signal. By placing the first sensing electrode layer near the contact surface, a stronger touch signal can be detected through the first sensing electrode layer when a touch operation occurs on the contact surface, thereby improving the accuracy of touch position detection. Furthermore, based on the premise that the number and positional layout of the first sensing electrodes satisfy comprehensive detection, the second sensing electrode is set to correspond to the position and number of the first sensing electrodes in the odd-numbered or even-numbered columns of the first sensing electrode layer. Since the second sensing electrode layer is placed near the display panel, the interference value detected by the second sensing electrode layer is more accurate, thereby improving the accuracy of interference detection, and further improving the accuracy of the operating frequency to avoid interference, thus further enhancing the accuracy of touch position detection. When the touch operation is located at the projection position where both the first and second sensing electrodes are present, the corresponding final detected (sensed) touch signal is the superposition of the first and second touch signals, which further increases the signal quantity of the detected touch signal, thereby improving the overall detection accuracy of the touch position based on the increase in signal quantity.

[0069] In one embodiment, the driving electrode, the first sensing electrode, and the second sensing electrode are configured as rhombuses, rectangles, triangles, hexagons, or other custom shapes.

[0070] In one embodiment, the materials of the driving electrode layer, the first sensing electrode layer, and the second sensing electrode layer are ITO (Indium Tin Oxide), copper mesh materials, silver nanomaterials, or other conductive materials.

[0071] Figure 5 This is a fifth schematic diagram of a capacitive touchscreen provided in an embodiment of this application, referring to... Figure 5The capacitive touchscreen also includes a drive bus 60, a sensing bus 70, and a control module 80. Drive electrodes 401 are sequentially connected along a first direction via first wires 601, one end of which is connected to the first end of the drive bus 60. First sensing electrodes 201 are sequentially connected along a second direction via second wires 701, and second sensing electrodes 501 are sequentially connected along a second direction via third wires 702. One end of corresponding second wires 701 and third wires 702 is connected and then connected to the first end of the sensing bus 70 via a wire. The second ends of the drive bus 60 and the sensing bus 70 are connected to the control module 80. For example, when the positions and numbers of the first sensing electrodes 201 and the second sensing electrodes 501 correspond, one end of each second wire 701 and third wire 702 is connected and then connected to the first end of the sensing bus 70 via a wire. When the position and number of the second sensing electrode 501 correspond to the odd-numbered columns of the first sensing electrodes 201 in the first sensing electrode layer 20, one end of the second wire 701 in each odd-numbered column is connected to one end of the corresponding third wire 702, and then connected to the first end of the sensing bus 70 via a wire. Similarly, one end of the second wire 701 in each even-numbered column is connected to the first end of the sensing bus 70. Alternatively, when the position and number of the second sensing electrode 501 correspond to the even-numbered columns of the first sensing electrodes 201 in the first sensing electrode layer 20, one end of the second wire 701 in each even-numbered column is connected to one end of the corresponding third wire 702, and then connected to the first end of the sensing bus 70 via a wire. Similarly, one end of the second wire 701 in each odd-numbered column is connected to the first end of the sensing bus 70.

[0072] As described above, the drive signals generated by the control module 80 are transmitted to the drive electrodes 401 of each first wire 601 via the drive bus 60. These drive signals form an electric field on the drive electrode layer 40, which is sensed (detected) by the corresponding sensing electrodes (i.e., the first sensing electrode 201 and the second sensing electrode 501) and transmitted to the control module 80 via the sensing bus 70. When a finger or other conductive object touches the contact surface of the capacitive touchscreen, it changes the distribution of the electric field formed by the aforementioned drive electrode layer 40. This change in electric field distribution is detected by the first sensing electrode 201 and / or the second sensing electrode 501 and converted into a touch signal, which is transmitted back to the control module 80 via the sensing bus 70. The control module 80 processes and analyzes the received touch signal to determine the touch position and touch interference value. The connection between the drive bus 60 and the sensing bus 70 ensures the accuracy and reliability of touch detection for the capacitive touchscreen.

[0073] The control module 80 includes a drive module 801, a sensing module 802, and a main control module 803. The first end of the drive module 801 is connected to the second end of the drive bus 60, and the second end of the drive module 801 is connected to the main control module 803. The first end of the sensing module 802 is connected to the second end of the sensing bus 70, and the second end of the sensing module 802 is connected to the main control module 803. The main control module 803 is used to send drive signals to the drive electrode layer 40 through the drive module 801, and to receive touch signals detected by the first sensing electrode layer 20 and the second sensing electrode layer 50 through the sensing module 802, and to determine the touch operation position and touch interference value based on the received touch signals. The drive module 801 performs orderly transmission of drive signals, and the sensing module receives touch signals detected by the sensing electrode layers (i.e., the first sensing electrode layer 20 and the second sensing electrode layer 50) and transmits them to the main control module 803. The main control module 803 determines the touch operation position and touch interference value based on the received touch signals according to a preset touch processing method.

[0074] Figure 6 This is a schematic diagram of an equivalent circuit for touch operation provided in an embodiment of this application, with reference to... Figure 6 The equivalent circuit of the first sensing mechanism, consisting of the first sensing electrode layer and the driving layer, will be used as an example for explanation. The touch operation will be illustrated using a finger touch as an example. When there is no finger touch on the contact surface, the capacitance value of the driving layer and the first sensing electrode layer is Cm, and the capacitance value between the first sensing electrode layer and the display panel is Cpyd. When there is a finger touch on the contact surface, since the finger is a conductor, Figure 6 The ellipse in the image represents the finger acting as a conductor, connecting with the electric field within the capacitive touchscreen. This causes a change in the electric field, resulting in a new capacitance value Cmx between the finger and the driving layer, and a new capacitance value Cmy between the finger and the first sensing electrode layer. This alters the overall capacitance value; specifically, the capacitance values ​​Cm and Cpyd between the driving layer and the first sensing electrode layer, as well as between the first sensing electrode layer and the display panel, all change. The corresponding change value is... △ C1, the △ C1 represents the first touch signal. Similarly, when a finger touches the sensor, the corresponding change value in the second sensing electrode layer is... △ C2, the △ C2 is the second touch signal. Based on the connection between the second wire corresponding to the first sensing electrode in the corresponding column and the third wire corresponding to the second sensing electrode, it is connected to the drive bus. Therefore, the touch signal transmitted to the drive bus is... △ C = □C1 + □C2.

[0075] As described above, in a capacitive touchscreen, a first sensing electrode layer is disposed near the contact surface, a second sensing electrode layer is disposed near the display panel, and a driving electrode layer is disposed between the first and second sensing electrode layers. A first sensing mechanism composed of the first and driving electrode layers is used to sense a first touch signal, and a second sensing mechanism composed of the second and driving electrode layers is used to sense a second touch signal. When a touch operation occurs on the contact surface, the touch signal corresponding to the touch operation is obtained by superimposing the first and second touch signals. Compared with the related technology that only sets one sensing electrode layer, the two-layer sensing electrode layer provided in this embodiment, with the first sensing electrode layer disposed near the contact surface, can improve the accuracy of touch operation sensing, thereby improving the accuracy of touch position detection; and with the second sensing electrode layer disposed near the display panel, can improve the accuracy of interference detection, thereby improving the accuracy of the operating frequency to avoid interference, and thus improving the overall accuracy of touch position detection. Furthermore, by setting up two layers of sensing electrodes, the touch signal corresponding to the touch operation is the superposition of the first touch signal and the second touch signal, which increases the signal quantity of the total touch signal detected, thereby improving the accuracy and sensitivity of touch position detection, and thus enhancing the overall user experience.

[0076] This application also provides a smart tablet, including the capacitive touchscreen described above.

[0077] Figure 7 This is a flowchart illustrating a touch detection method provided in an embodiment of this application. The touch detection method provided in this embodiment can be executed by a touch detection device, which can be implemented through software and / or hardware. The touch detection device can consist of two or more physical entities, or it can consist of a single physical entity. Generally, the touch detection device can be an electronic device, such as a smart tablet, tablet computer, smart TV, learning machine, or mobile phone.

[0078] The following description uses a smart tablet as an example to illustrate the touch detection method. (Refer to...) Figure 7 This touch detection method, used in the main control module of the aforementioned smart tablet, specifically includes:

[0079] S101. Receive touch signal, the touch signal is obtained by superimposing the first touch signal sensed by the first sensing electrode layer and the second touch signal sensed by the second sensing electrode layer.

[0080] When a touch operation occurs on the contact surface of the capacitive touchscreen, the first sensing electrode layer senses a first touch signal, and the second sensing electrode layer senses a second touch signal. The first and second touch signals are superimposed to obtain the touch signal corresponding to the touch operation. The touch signal is transmitted to the main control module via the sensing bus. The main control module receives the touch signal and performs corresponding analysis and processing based on it.

[0081] S102. Determine the touch position point and touch interference value based on the touch signal.

[0082] The main control module in the smart tablet determines the touch location and touch interference value based on a preset touch analysis and processing method and the received touch signal. The touch interference value can be understood as the operating frequency or scanning frequency when significant interference exists. The two-layer sensing electrode configuration provided in this embodiment, with the first sensing electrode layer positioned close to the contact surface, improves the accuracy of touch operation sensing, thereby enhancing the accuracy of touch location detection. Through the two-layer sensing electrode configuration, the touch signal corresponding to the touch operation is a superposition of the first and second touch signals, thus increasing the signal strength of the touch signal received by the main control module. The main control module processes and analyzes the touch signal with a higher signal strength, resulting in a more accurate touch location and a more accurate touch interference value.

[0083] S103. Perform corresponding interactive operations based on the touch location point, and adjust the operating frequency of the drive sensor based on the touch interference value.

[0084] Based on the aforementioned touch operation, corresponding interactive operations are performed at the determined touch position points, and the operating frequency or scanning frequency of the drive sensor is adjusted according to the touch interference value, so as to avoid the operating frequency or scanning frequency corresponding to the touch interference value, thereby reducing touch interference and improving the overall accuracy of touch position detection.

[0085] As described above, in a capacitive display screen, by setting up two layers of sensing electrodes, the touch signal corresponding to a touch operation is a superposition of the first touch signal and the second touch signal. Therefore, the signal quantity of the touch signal received by the main control module is increased. The main control module processes and analyzes the touch signal with a higher signal quantity, which can improve the detection accuracy of touch position points and touch interference values. Based on the improved detection accuracy of touch interference values, the accuracy of the operating frequency to avoid interference can be improved, thereby improving the overall accuracy of touch position detection. Therefore, it can improve the user's touch experience.

[0086] This application embodiment also provides a storage medium for storing computer-executable instructions. When executed by a computer processor, the computer-executable instructions are used to perform a touch detection method. The touch detection method includes: receiving a touch signal, the touch signal being obtained by superimposing a first touch signal sensed by a first sensing electrode layer and a second touch signal sensed by a second sensing electrode layer; determining a touch position point and a touch interference value based on the touch signal; performing a corresponding interactive operation based on the touch position point; and adjusting the operating frequency of the driving sensor based on the touch interference value.

[0087] Storage medium – any type of memory device or storage device. The term “storage medium” is intended to include: mounting media, such as CD-ROM, floppy disk, or magnetic tape devices; computer system memory or random access memory, such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (e.g., hard disk or optical storage); registers or other similar types of memory elements, etc. Storage medium may also include other types of memory or combinations thereof. Furthermore, storage medium may reside in a first computer system in which the program is executed, or it may reside in a different second computer system connected to the first computer system via a network (such as the Internet). The second computer system can provide program instructions to the first computer for execution. The term “storage medium” can include two or more storage media residing in different locations (e.g., in different computer systems connected via a network). Storage medium may store program instructions (e.g., specifically implemented as a computer program) executable by one or more processors.

[0088] Of course, the computer-executable instructions provided in the embodiments of this application are not limited to the touch detection method described above, but can also perform related operations in the touch detection method provided in any embodiment of this application.

[0089] The smart tablet and storage medium provided in the above embodiments can execute the touch detection method provided in any embodiment of this application. For technical details not described in detail in the above embodiments, please refer to the touch detection method provided in any embodiment of this application.

[0090] The above description is merely a preferred embodiment and the technical principles employed in this application. This application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions that can be made by those skilled in the art will not depart from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the claims.

[0091] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0092] In this application, unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0094] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the horizontal surface of the first feature is higher than that of the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the horizontal surface of the first feature is lower than that of the second feature.

[0095] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and application concept of this application, should be included within the scope of protection of this application.

Claims

1. A capacitive touchscreen, characterized in that, Includes a cover plate, a driving electrode layer, a first sensing electrode layer, and a second sensing electrode layer; The first sensing electrode layer is disposed between the cover plate and the driving electrode layer; The driving electrode layer is disposed between the first sensing electrode layer and the second sensing electrode layer; The first sensing mechanism, formed by the first sensing electrode layer and the driving electrode layer, is used to sense the first touch signal. The second sensing mechanism, formed by the second sensing electrode layer and the driving electrode layer, is used to sense the second touch signal. The touch signal corresponding to the touch operation is obtained by superimposing the first touch signal and the second touch signal.

2. The capacitive touchscreen according to claim 1, characterized in that, The driving electrode layer includes driving electrodes arranged along a first direction, the first sensing electrode layer includes first sensing electrodes arranged along a second direction, and the second sensing electrode layer includes second sensing electrodes arranged along a second direction. The first direction and the second direction are perpendicular.

3. The capacitive touchscreen according to claim 2, characterized in that, The positions and numbers of the first sensing electrode and the second sensing electrode correspond.

4. The capacitive touchscreen according to claim 2, characterized in that, The second sensing electrode corresponds to the position and number of the first sensing electrodes in the odd-numbered columns of the first sensing electrode layer; Alternatively, the second sensing electrode corresponds to the position and number of the first sensing electrodes in the even-numbered columns of the first sensing electrode layer.

5. The capacitive touchscreen according to claim 2, characterized in that, It also includes a sensing bus, a drive bus, and a control module; The driving electrodes are connected sequentially along a first direction via a first wire, and one end of the first wire is connected to the first end of the driving bus. The first sensing electrode is connected sequentially along the second direction via a second wire, and the second sensing electrode is connected sequentially along the second direction via a third wire; The second and third wires at corresponding positions are connected at one end, and are connected to the first end of the sensing bus through a wire; The second end of the drive bus and the second end of the sensing bus are connected to the control module.

6. The capacitive touchscreen according to claim 5, characterized in that, The control module includes a drive module, a sensing module, and a main control module; The first end of the drive module is connected to the second end of the drive bus, and the second end of the drive module is connected to the main control module. The first end of the sensing module is connected to the second end of the sensing bus, and the second end of the sensing module is connected to the main control module. The main control module is used to send driving signals to the driving electrode layer through the driving module, and to receive touch signals detected by the first sensing electrode layer and the second sensing electrode layer through the sensing module, and to determine the touch position point and touch interference value based on the received touch signals.

7. The capacitive touchscreen according to any one of claims 1-6, characterized in that, It also includes glass substrates; The first sensing electrode layer is disposed between the cover plate and the glass substrate; The driving electrode layer is disposed between the glass substrate and the second sensing electrode layer, and is attached to the second sensing electrode layer by adhesive.

8. The capacitive touchscreen according to any one of claims 1-6, characterized in that, It also includes a first polymer material substrate and a second polymer material substrate; The first sensing electrode layer is disposed between the cover plate and the first polymer material substrate; The driving electrode layer is disposed between the first polymer substrate and the second polymer substrate; The second sensing electrode layer is attached to the second polymer substrate by adhesive.

9. The capacitive touchscreen according to any one of claims 1-6, characterized in that, The first sensing electrode layer and the driving electrode layer are deposited on the interface between the cover plate and the first sensing electrode layer through a micron-level multilayer structure; The driving electrode layer is attached to the second sensing electrode layer by adhesive.

10. A smart tablet, characterized in that, Including the capacitive touchscreen as described in any one of claims 1-9.

11. A touch detection method, characterized in that, The smart tablet according to claim 10 includes: The system receives touch signals, which are obtained by superimposing a first touch signal sensed by a first sensing electrode layer and a second touch signal sensed by a second sensing electrode layer. The touch location and touch interference value are determined based on the touch signal; The system performs corresponding interactive operations based on the touch location and adjusts the operating frequency of the drive sensor based on the touch interference value.

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