Touch screen and display device
By setting the first ground electrode in the touch area of the touch screen and communicating with the power ground when interfering with the signal, the electrical interference problem during suspended operation is solved, the touch accuracy and anti-interference ability are improved, and the product quality and user experience are improved. .
Patent Information
- Application Number
- CN202420896054.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-26
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-04-26
AI Technical Summary
Existing touch screens are susceptible to electrical interference when operating in suspended space, resulting in low touch accuracy and false points, affecting product quality and user experience.
A touch screen is designed, including a touch area and a non-touch area. The touch area is provided with a base, a plurality of touch electrodes and a first ground electrode. The touch chip controls the first ground electrode when detecting an interference signal. In communication with the power ground, the capacitive impedance between the human body GND and the power ground is reduced, and the phase difference of the interference signal is reduced.
It greatly improves touch accuracy and anti-interference ability, improves product quality and user experience, and improves electrostatic protection, especially in suspended touch situations.
Smart Images
Figure CN222232987U_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present disclosure relate to the field of touch control technology, and in particular to a touch screen and a display device. Background Art
[0002] Touch screens have been widely used in the field of display technology. With the continuous improvement of technology, the requirements for touch accuracy are also constantly increasing. When there is electrical interference (especially common film interference) on the existing touch screen, there is capacitive impedance (where GND is the abbreviation of Ground in English for the ground terminal) between the screen body GND (screen body ground) and the human body GND (human body ground), which causes the interference signal to produce a phase difference between the screen body GND and the human body GND (human body ground), thereby affecting the scanning signal of the touch screen, resulting in inaccurate touch or false points; this situation is more likely to occur and is more serious when the touch screen is in a suspended operation (for example: placing the touch screen on a bracket), thereby greatly reducing product quality and user experience. Utility Model Content
[0003] The embodiments of the present disclosure provide a touch screen and a display device, which can significantly improve the problem of low touch accuracy caused by electrical interference, thereby improving anti-interference capability and touch accuracy, and significantly improving product quality and user experience.
[0004] According to some embodiments of the present disclosure, the embodiments of the present disclosure provide a touch screen, comprising: a touch area and a non-touch area connected to the touch area;
[0005] The touch control area is provided with a substrate and a plurality of touch control electrodes and a plurality of first ground electrodes located on the substrate; the touch control electrodes and the first ground electrodes are correspondingly arranged and insulated from each other; the touch control electrodes are provided with a first hollow area, and the orthographic projection of the first ground electrode on the substrate is located within the orthographic projection of the edge of the first hollow area of the corresponding touch electrode on the substrate;
[0006] The non-touch area is provided with a touch chip and a power ground; the touch chip is used to control the first ground electrode to be connected to the power ground when an interference signal is detected during the touch stage.
[0007] According to the touch screen provided by the embodiment of the present disclosure, the touch electrode and the first ground electrode are arranged in the same layer, and the first ground electrode is arranged in the first hollow area of the touch electrode.
[0008] According to the touch screen provided by the embodiment of the present disclosure, the first ground electrode is a transparent conductive electrode.
[0009] According to the touch screen provided by the embodiment of the present disclosure, the plurality of touch electrodes are arranged in an array, and the touch area further comprises a plurality of ground wires insulated from the touch electrodes;
[0010] The grounding wire is arranged between any two adjacent rows of the touch electrodes; the touch chip is also used to control the grounding wire to be connected to the power ground when an interference signal is detected during the touch stage.
[0011] According to the touch screen provided by the embodiment of the present disclosure, the first ground electrode and the ground line are not connected to each other.
[0012] According to the touch screen provided by the embodiment of the present disclosure, the touch electrodes are sensing electrodes, and the touch area is further provided with a plurality of driving electrodes; the sensing electrodes and the driving electrodes are insulated from each other;
[0013] The driving electrodes are used to send driving signals under the control of the touch control chip, and the sensing electrodes are used to receive sensing signals and transmit the sensing signals to the touch control chip.
[0014] According to the touch screen provided by the embodiment of the present disclosure, the plurality of driving electrodes and the plurality of sensing electrodes are arranged in the same layer.
[0015] According to the touch screen provided by the embodiment of the present disclosure, the driving electrode is provided with a second hollow area, the touch area is further provided with a plurality of second grounding electrodes, and the second grounding electrodes are provided in the second hollow area;
[0016] The touch control chip is further used to control the second ground electrode to be connected to the power ground when an interference signal is detected during the touch control stage.
[0017] According to the touch screen provided by the embodiment of the present disclosure, the second ground electrode is a transparent conductive electrode.
[0018] According to some embodiments of the present disclosure, another aspect of the present disclosure provides a display device, comprising the above-mentioned touch screen.
[0019] The embodiments of the present disclosure provide a touch screen and a display device. When the touch chip detects an interference signal during the touch stage, it controls the first ground electrode to be connected to the power ground. Then, when the user touches the touch electrode of the touch screen body, he will touch the first ground electrode at the same time. At this time, the first ground electrode is connected to the power ground, and the human body GND (i.e. Figure 1 The Earth GND shown in the figure is connected to the power ground, thereby greatly reducing the capacitive impedance between the human body GND and the power ground (i.e. Figure 1Cd and Cg shown in the figure), so that the phase difference of the interference signal (especially the common membrane interference signal) between the human body GND and the power ground can be almost ignored, which can ultimately greatly improve the problem of low touch accuracy caused by electrical interference, greatly improve the anti-interference ability and touch accuracy, and greatly improve product quality and user experience. In addition, by connecting the first ground electrode to the power ground, the static electricity of the touch area can be timely discharged, which is conducive to improving electrostatic protection (ESD); if the touch screen is used for suspended touch, the anti-interference ability of suspended touch can also be improved by connecting the first ground electrode to the power ground. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings, and these exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the pictures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the traditional technology, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0021] Figure 1 A schematic diagram of the principle of electrical interference in a touch screen provided by an embodiment of the present disclosure;
[0022] Figure 2 One of the structural schematic diagrams of the touch screen provided in the embodiment of the present disclosure;
[0023] Figure 3 This is a second structural schematic diagram of the touch screen provided in an embodiment of the present disclosure. DETAILED DESCRIPTION
[0024] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the technical solutions of the present disclosure will be clearly and completely described below in combination with the specific embodiments of the present disclosure and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.
[0025] In the description of the embodiments of the present disclosure, “plurality” means two or more than two, unless otherwise clearly and specifically defined.
[0026] In the description of the embodiments of the present disclosure, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0027] In the description of the embodiments of the present disclosure, words such as "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. This is only for the purpose of clearly describing the technical solutions of the embodiments of the present disclosure and shall not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.
[0028] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0029] In the description of the embodiments of the present disclosure, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to the specific circumstances.
[0030] refer to Figure 1 As shown in the figure, when there is electrical interference (especially common film interference) on the touch screen, the screen GND ( Figure 1 Power GND) and human body GND ( Figure 1 There are capacitive impedances Cd and Cg between Earth and GND, which can affect the control chip of the touch screen (such as Figure 1 The scanning signal output by the MCU shown in the figure may cause inaccurate touch or false points. Figure 1 In the figure, TPSensor represents the touch sensor, Rs and Rh are inductive impedances, Cp is the electrode capacitance, Ct is the touch capacitance, and Ch is the human body capacitance.
[0031] Based on the above, the present disclosure provides a touch screen, referring to Figure 2 As shown, it includes: a touch area TA and a non-touch area NA connected to the touch area TA;
[0032] The touch area TA is provided with a substrate 1 and a plurality of touch electrodes 2 and a plurality of first ground electrodes 3 located on the substrate 1; the touch electrodes 2 and the first ground electrodes 3 are correspondingly arranged and insulated from each other; the touch electrodes are provided with a first hollow area, and the orthographic projection of the first ground electrode on the substrate is located within the orthographic projection of the edge of the first hollow area of the corresponding touch electrode on the substrate;
[0033] The non-touch area NA is provided with a touch chip 4 and a power ground 5; the touch chip is used to control the first ground electrode to be connected to the power ground when an interference signal is detected during the touch stage.
[0034] The above-mentioned touch area refers to the area where the user can realize the touch function after touching it, and is provided with touch sensors such as touch electrodes; the non-touch area is used to set touch wiring, touch chips, etc., and the user cannot realize the touch function by touching this area. The non-touch area can be set around the touch area, or the non-touch area is connected to part of the touch area, which is not limited here. The shape of the boundary between the above-mentioned touch area and the non-touch area is not limited, for example, refer to Figure 2 As shown, the shape of the boundary between the touch area and the non-touch area can be a rectangle, and the non-touch area can be connected to one side of the touch area. The above-mentioned substrate can be made of insulating material, and the specific material is not limited. For example, it can be glass, polyimide (PI), silicon nitride or silicon oxide.
[0035] The arrangement, size and shape of the above-mentioned multiple touch electrodes are not limited. For example, the multiple touch electrodes can be arranged in an array. The above-mentioned multiple touch electrodes can all be driving electrodes (also called TX electrodes, where TX is the abbreviation of Transmit in English); or, the multiple touch electrodes can all be sensing electrodes (also called RX electrodes, where RX is the abbreviation of Receive in English); or, among the multiple touch electrodes, some are driving electrodes and the rest are sensing electrodes, which is not limited here.
[0036] The size and shape of the first hollow area of the touch electrode are not limited. The size of the first ground electrode needs to be smaller than the size of the first hollow area, and its shape is not limited and can be determined according to actual conditions.
[0037] The orthographic projection of the first grounding electrode on the substrate refers to the projection of the first grounding electrode on the substrate in a direction perpendicular to the substrate; the orthographic projection of the edge of the first hollow area of the touch electrode on the substrate refers to the projection of the edge of the first hollow area of the touch electrode on the substrate in a direction perpendicular to the substrate. The orthographic projection of the first grounding electrode on the substrate is located within the orthographic projection of the edge of the first hollow area of the corresponding touch electrode on the substrate, so that when the user touches the touch electrode, the first grounding electrode is touched at the same time. Here, the first grounding electrode and the touch electrode can be set in the same layer, or in different layers, which is not limited in the embodiments of the present disclosure.
[0038] The above-mentioned touch chip can be a single-chip microcomputer, ARM (Advanced RISC Machines) or FPGA (Field Programmable Gate Array) and other chips, which can be determined according to actual design requirements. The specific method of the touch chip controlling the connection between the first ground electrode and the power ground is not limited. For example, a switch can be set between the first ground electrode and the power ground, and the touch chip controls the connection between the first ground electrode and the power ground by controlling the opening and closing of the switch. It should be noted that Figure 2 The structure and position relationship of the touch electrode, the first ground electrode, the touch chip and the power ground are only schematically illustrated, and the specific electrical connection relationship and control relationship of the corresponding structures are not reflected.
[0039] The above power ground is the screen GND, that is Figure 1 In the touch screen provided by the embodiment of the present disclosure, when the touch chip detects an interference signal during the touch stage, it controls the first ground electrode to be connected to the power ground. Then, when the user touches the touch electrode of the touch screen body, he will touch the first ground electrode at the same time. At this time, the first ground electrode (equivalent to the virtual GND) is connected to the power ground, and the human body GND (i.e. Figure 1 The Earth GND shown in the figure is connected to the power ground, thereby greatly reducing the capacitive impedance between the human body GND and the power ground (i.e. Figure 1 Cd and Cg shown in the figure), so that the phase difference of the interference signal (especially the common membrane interference signal) between the human body GND and the power ground can be almost ignored, which can ultimately greatly improve the problem of low touch accuracy caused by electrical interference, greatly improve the anti-interference ability and touch accuracy, and greatly improve product quality and user experience. In addition, by connecting the first ground electrode to the power ground, the static electricity of the touch area can be timely discharged, which is conducive to improving electrostatic protection (ESD); if the touch screen is used for suspended touch, the anti-interference ability of suspended touch can also be improved by connecting the first ground electrode to the power ground.
[0040] In order to ensure that the user touches the touch electrode and the first ground electrode at the same time, and avoid the influence of other film layers on the first ground electrode, in one or more embodiments, the touch electrode and the first ground electrode are arranged in the same layer, and the first ground electrode is arranged in the first hollow area of the touch electrode.
[0041] The above-mentioned same-layer arrangement refers to the use of a one-time patterning process. A one-time patterning process refers to a process of forming a required layer structure through one exposure. A one-time patterning process includes masking, exposure, development, etching and stripping processes.
[0042] When the touch screen is applied to a display device, in order not to affect the aperture ratio and the display effect, in one or more embodiments, the first ground electrode is a transparent conductive electrode. For example, the first ground electrode may be an ITO (Indium Tin Oxide) electrode.
[0043] In one or more embodiments, reference Figure 3 As shown, multiple touch electrodes 2 are arranged in an array, and the touch area also includes multiple grounding wires 6 insulated from the touch electrodes 2; the grounding wires are arranged between any two adjacent rows of touch electrodes; the touch chip is also used to control the grounding wires to be connected to the power ground when an interference signal is detected during the touch stage.
[0044] Any two adjacent rows of touch electrodes mentioned above may refer to any two adjacent lines of touch electrodes and / or any two adjacent columns of touch electrodes, which are not specifically limited here. Figure 3 The illustration is based on the example that a ground line is provided for any two adjacent rows and any two adjacent columns of touch electrodes. The specific method of controlling the connection between the ground line and the power ground by the touch chip is not limited. For example, a switch can be provided on the connection line between the ground line and the power ground, and the touch chip controls the connection between the ground line and the power ground by controlling the opening and closing of the switch.
[0045] It should be noted that the grounding wire is arranged between the two original rows of touch electrodes, and there is no need to increase the distance between the two rows of touch electrodes. That is, the grounding wire is arranged without changing the original structure as much as possible.
[0046] By setting a grounding wire, when the user touches the touch electrode of the touch screen body, he will also touch the grounding wire at the same time. In this way, when interference occurs, the human body GND can be connected with the power ground more quickly, thereby reducing the influence of the interference signal more quickly.
[0047] If the first grounding electrode and the grounding wire are connected, the different first grounding electrodes and grounding wire connections are very likely to form a U-shaped connection structure, resulting in an island effect (i.e., a phenomenon in which there is a current path in a certain area but no current actually flows through it), thereby affecting the connectivity between the human body GND and the power ground. In order to prevent the island effect, in one or more embodiments, the first grounding electrode and the grounding wire are not connected to each other.
[0048] In one or more embodiments, the touch electrode is a sensing electrode (RX electrode), and the touch area is also provided with a plurality of driving electrodes (TX electrodes); the sensing electrode and the driving electrode are insulated from each other; the driving electrode is used to send a driving signal under the control of the touch chip, and the sensing electrode is used to receive the sensing signal and transmit the sensing signal to the touch chip.
[0049] Since the sensing electrode transmits the received sensing signal to the touch chip, and the touch chip determines the touch position and other touch information according to the sensing signal, the user touches the first ground electrode and the sensing electrode at the same time, which can more effectively reduce the capacitive impedance between the human body GND and the power ground. The relative position relationship between the sensing electrode and the driving electrode is not limited and can be selected according to actual requirements.
[0050] In order to reduce the number of manufacturing processes and simplify the process, in one or more embodiments, the plurality of driving electrodes and the plurality of sensing electrodes are arranged in the same layer.
[0051] In order to further improve the efficiency of reducing the capacitive impedance between the human body GND and the power ground, in one or more embodiments, the driving electrode is provided with a second hollow area, and the touch area is also provided with a plurality of second grounding electrodes, and the second grounding electrodes are provided in the second hollow area; the touch chip is also used to control the second grounding electrode to be connected to the power ground when an interference signal is detected during the touch stage. In this way, when the user touches the sensing electrode and the driving electrode at the same time, he can also touch the first grounding electrode and the second grounding electrode at the same time, so as to quickly achieve the connection between the human body GND and the power ground, further improving the anti-interference ability.
[0052] It should be noted that a ground line may be provided between the driving electrodes, or may not be provided, which is not limited here. The specific manner in which the touch chip controls the connection between the second ground electrode and the power ground is not limited. For example, a switch may be provided on the connection line between the second ground electrode and the power ground, and the touch chip controls the connection between the second ground electrode and the power ground by controlling the opening and closing of the switch.
[0053] When the touch screen is applied to a display device, in order not to affect the aperture ratio and the display effect, in one or more embodiments, the second ground electrode is a transparent conductive electrode. For example, the second ground electrode may be an ITO electrode.
[0054] The embodiment of the present disclosure also provides a display device, including: the above-mentioned touch screen. The display device can be a rigid display device or a flexible display device (i.e., bendable and foldable); its type can be a TN (Twisted Nematic) type, VA (Vertical Alignment) type, IPS (In-Plane Switching) type, or ADS (Advanced Super Dimension Switch) type, etc., liquid crystal touch display device, or an OLED (Organic Light-Emitting Diode) touch display device, or a Micro LED touch display device or a Mini LED touch display device, as well as any product or component with a display function including these touch display devices, such as a television, a digital camera, a mobile phone, a tablet computer, etc.
[0055] The above-mentioned display device may also include a display module, and the relative positions of the display module and the touch screen are not limited. For example, the touch screen can be mounted on the display module to form an OGS (One Glass Solution) touch display device. For example, the touch screen can be fixed to the display module in a fully-fitting manner. Alternatively, the touch electrodes of the touch screen can also be embedded in the display module to form an In Cell touch display device or an On Cell touch display device. The difference between the InCell touch display device and the On Cell touch display device is that the positions where the touch electrodes are embedded are different. The embodiments of the present disclosure do not limit this.
[0056] Those skilled in the art can understand that the above-mentioned embodiments are specific examples for realizing the present disclosure, and in practical applications, various changes can be made to them in form and details without departing from the spirit and scope of the present disclosure. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, so the protection scope of the present disclosure shall be based on the scope defined in the claims.
Claims
1. A touch screen, characterized in that: include: A touch area and a non-touch area connected to the touch area; The touch control area is provided with a substrate and a plurality of touch control electrodes and a plurality of first ground electrodes located on the substrate; The touch electrode and the first ground electrode are arranged correspondingly and insulated from each other; the touch electrode is provided with a first hollow area, and the orthographic projection of the first ground electrode on the substrate is located within the orthographic projection of the edge of the first hollow area of the corresponding touch electrode on the substrate; The non-touch area is provided with a touch chip and a power ground; the touch chip is used to control the first ground electrode to be connected to the power ground when an interference signal is detected during the touch stage.
2. The touch screen according to claim 1, characterized in that: The touch electrode and the first ground electrode are arranged in the same layer, and the first ground electrode is arranged in the first hollow area of the touch electrode.
3. The touch screen according to claim 1, characterized in that: The first ground electrode is a transparent conductive electrode.
4. The touch screen according to any one of claims 1 to 3, characterized in that: The plurality of touch electrodes are arranged in an array, and the touch area further comprises a plurality of ground wires insulated from the touch electrodes; The grounding wire is arranged between any two adjacent rows of the touch electrodes; the touch chip is also used to control the grounding wire to be connected to the power ground when an interference signal is detected during the touch stage.
5. The touch screen according to claim 4, characterized in that: The first ground electrode and the ground line are not connected to each other.
6. The touch screen according to claim 4, characterized in that: The touch control electrodes are sensing electrodes, and the touch control area is further provided with a plurality of driving electrodes; the sensing electrodes and the driving electrodes are insulated from each other; The driving electrodes are used to send driving signals under the control of the touch control chip, and the sensing electrodes are used to receive sensing signals and transmit the sensing signals to the touch control chip.
7. The touch screen according to claim 6, characterized in that: The plurality of driving electrodes and the plurality of sensing electrodes are arranged in the same layer.
8. The touch screen according to claim 7, characterized in that: The driving electrode is provided with a second hollow area, and the touch control area is further provided with a plurality of second grounding electrodes, and the second grounding electrodes are provided in the second hollow area; The touch control chip is further used to control the second ground electrode to be connected to the power ground when an interference signal is detected during the touch control stage.
9. The touch screen according to claim 8, characterized in that: The second ground electrode is a transparent conductive electrode.
10. A display device, characterized in that: include: The touch screen according to any one of claims 1 to 9.