Touch panel with electrostatic protection and touch device
By setting up an ESD leakage circuit and a ring grounding structure on the touchpad PCB, the problem of static electricity accumulation in laptops with plastic bodies was solved, enabling rapid static electricity release and improved device stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2026-03-27
AI Technical Summary
In the existing technology, when a laptop with a plastic body is subjected to electrostatic discharge, static charge easily accumulates on the surface and can be coupled or directly conducted to the internal circuitry, leading to malfunctions or hardware damage. There is a lack of effective electrostatic protection design.
An ESD leakage circuit is set on the PCB of the touchpad. The grounding wires of the main control system and the touch chip are connected to the common grounding point through current limiting resistors. The ESD leakage circuit is connected to the grounding grid of the main control system to form a large-area leakage path, avoiding local voltage accumulation, and quickly releasing static electricity through ESD grounding and exposed copper blocks.
It effectively releases static electricity, reducing direct impact on the touch chip and main control system. It is suitable for laptops made of plastic materials, improving the reliability and stability of the device and reducing the failure rate.
Smart Images
Figure CN224052628U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to touchpad technical field especially touchpad with static electricity protection and touch equipment. BACKGROUND
[0002] In recent years, notebook computer as portable electronic equipment's core product, its material selection and electromagnetic compatibility design directly influence user experience and product reliability. In high-end market, metal material (such as aluminium alloy, magnesium alloy etc.) because of its excellent mechanical strength, heat dissipation performance and electromagnetic shielding characteristic, still is the first choice of shell material. The natural conductive characteristic of metal body provides the efficient discharge path for electrostatic discharge (ESD) : when user contacts touchpad, static charge can be quickly guided into the ground through metal shell, avoids the risk of instantaneous high voltage breakdown caused by charge accumulation.
[0003] In the ESD protection design of traditional touchpad, usually adopts the strategy of partition grounding to balance signal integrity and anti-interference ability. Specifically, it is to set up the ESD discharge circuit and the ground network (paving ground) of main control system independently, however, the protection efficiency of this design is highly dependent on the conductivity of the whole machine. If the metal structure of the body is complete, static charge can be quickly guided. Conversely, if there is an insulating area (such as joint, decoration), local discharge problem may still occur.
[0004] In order to reduce the cost, plastic and composite material (such as carbon fiber reinforced polymer) because of the advantages of low cost, light weight, plasticity and environmental protection easy recovery, has been widely used in low-end notebook computer shell. However, the insulation characteristics of such materials result in the whole machine cannot form an effective static discharge path. When the user touches the plastic shell or touchpad, static charge is easy to accumulate on the surface, and through coupling or direct conduction to the internal circuit. Because the discharge area of conventional ESD protection design is limited, the charge may bypass the protection circuit, directly impact the main control system or sensor, cause functional abnormalities and even hardware damage. Existing tests show that the notebook computer with plastic body under the contact discharge 8kV (IEC 61000-4-2 standard), the touchpad failure rate is significantly higher than that of metal body product.
[0005] In the process of realizing the utility model, the applicant finds that there are at least the following problems in the prior art:
[0006] At present, there is an urgent need for a touchpad with electrostatic protection function that can be applied to plastic body. UTILITY MODEL CONTENTS
[0007] The utility model discloses a purpose at providing a kind of touchpad with electrostatic protection and touch device, to solve the technical problem of the touchpad with electrostatic protection function that can be applied to plastic fuselage in prior art currently, urgently needed.
[0008] To achieve the above object, the utility model provides the following technical scheme:
[0009] The utility model provides a kind of touchpad with electrostatic protection, comprising: PCB board, ESD discharge circuit, main control system, touch chip and insulating shell;The ESD discharge circuit, main control system, touch chip are all set on the PCB board;The ground grid of the main control system and the ground wire of the touch chip are connected with the same common ground point by first connecting element;The ground grid of the main control system is laid on the PCB board;The ESD discharge circuit is connected with the ground grid of the main control system;The PCB board, ESD discharge circuit, main control system, touch chip are all set in insulating shell.
[0010] Optionally, the ESD discharge circuit includes ESD ring ground;The ESD ring ground is set around the edge of the PCB board, and is connected with the ground grid of the main control system.
[0011] Optionally, the ESD discharge circuit further includes at least one ESD copper block;The ESD copper block is covered and set on the ground grid of the main control system.
[0012] Optionally, the outer edge of the ESD ring ground and the edge of the PCB board have a distance of 0.1mm-1mm.
[0013] Optionally, the inner edge of the ESD ring ground and the ground grid of the main control system have a distance of 0.1mm-1mm.
[0014] Optionally, the outer edge of the ESD copper block and the ground grid of the main control system have a distance of 0.1mm-1mm.
[0015] Optionally, the ESD copper block is connected with the ESD ring ground by first bridging line.
[0016] Optionally, the ESD copper block is connected with the ground grid of the main control system by second bridging line or second connecting element.
[0017] Optionally, the material of the insulating shell is resin or plastic.
[0018] A kind of touch device, including the touchpad with electrostatic protection of any one described above.
[0019] The technical scheme in the above technical scheme of the utility model has the following advantages or beneficial effects:
[0020] The touch panel provided by the utility model separates the grounding grid of the main control system and the grounding wire of the touch chip, the grounding wires of the two are separately connected to the common grounding point through the current-limiting resistor, then the static electricity can be quickly released only through the ESD discharge circuit, the local voltage accumulation is avoided, so that the touch panel can also be applied to the notebook computer made of plastic material, and the grounding grid of the main control system and the grounding wire of the touch chip are connected through the resistor to realize single-point common grounding connection, the resistor can limit the size of the ESD circuit current, so that the direct impact on the touch chip and the main control system is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to make the technical scheme of the utility model embodiments more clearly, the following will briefly introduce the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor, and in the drawings:
[0022] Figure 1 It is the first structure schematic diagram of the touch panel with static electricity protection of the utility model embodiment;
[0023] Figure 2 It is the second structure schematic diagram of the touch panel with static electricity protection of the utility model embodiment;
[0024] In the drawing: 1, PCB board;2, ESD discharge circuit;21, ESD ring ground;22, ESD copper block;3, main control system;31, grounding grid;4, touch chip;5, first connecting element;6, second connecting element;7, first bridging line;8, second bridging line. DETAILED DESCRIPTION
[0025] In order to make the technical scheme of the utility model embodiments more clearly, the following will briefly introduce the drawings needed to be used in the embodiment description, obviously, the drawings in the following description are only some embodiments of the utility model, for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor, and in the drawings:
[0026] In the description of the utility model, need understanding, the term "center", "longitudinal", "lateral" etc. Indicate is based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the element must have a specific orientation, with a specific orientation structure and operation. The term "first", "second" etc. Is only for the purpose of description, and can not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. The term "a plurality of" means two or more. The term "connected", "connection" should be broadly understood, for example, it can be fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, communication connection, direct connection, indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. The term "and / or" includes any and all combinations of one or more related listed items. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0027] In order to illustrate the technical scheme described in the utility model, the following specific embodiments are described, only the part related to the embodiment of the utility model is shown.
[0028] Embodiment one:
[0029] As Figure 1 Indicated, the utility model provides a touch panel with static protection, include: PCB board 1, ESD discharge circuit 2, main control system 3, touch chip 4 and insulating shell, ESD discharge circuit 2, main control system 3, touch chip 4 all are arranged on PCB board 1, the ground grid 31 of main control system 3 and the ground wire of touch chip 4 all are connected with the same common ground point through first connecting element 5, the ground grid 31 of main control system 3 is laid on PCB board 1, ESD discharge circuit 2 is connected with the ground grid 31 of main control system 3, PCB board 1, ESD discharge circuit 2, main control system 3, touch chip 4 all are arranged in insulating shell. The first connecting element in this embodiment is resistance or magnetic bead, through resistance or magnetic bead can connect the ground of main control system 3 and the ground of touch chip 4, and the magnetic bead can always high frequency noise and signal interference.
[0030] The touchpad provided by the embodiment separates the ground grid 31 of the host system 3 and the ground wire of the touch chip 4, and the ground wires of the two are separately connected to a common ground point through a connecting element, and then the static electricity can be quickly released through the ESD discharge circuit 2, the local voltage accumulation is avoided, and the touchpad can also be applied to a notebook computer made of plastic material; and the ground grid 31 of the host system 3 and the ground wire of the touch chip 4 are connected through a resistor to realize single-point common grounding, and the resistor can limit the size of the ESD circuit current, thereby reducing the direct impact on the touch chip 4 and the host system 3.
[0031] As an alternative embodiment, as shown in Figure 1 The ESD discharge circuit 2 includes an ESD ring ground 21; the ESD ring ground 21 quickly and uniformly discharges the static electricity possibly generated in the working area to the ground through a ring-shaped ground line to maintain the balance and stability of the static electricity potential in the working area, reduce the risk of static electricity discharge, and protect the quality of the touchpad and the normal operation of the equipment in the production process. The ESD ring ground 21 is arranged around the edge of the PCB board 1 and connected to the ground grid 31 of the host system 3. The ESD discharge circuit 2 also includes at least one ESD copper exposure block 22 (the touchpad of the embodiment is provided with two ESD copper exposure blocks 22); the copper exposure refers to the part of the copper foil on the surface of the circuit board exposed. The ESD copper exposure block 22 is an exposed copper block area for processing static electricity discharge problem, which plays a role in static electricity discharge. When static electricity is generated, the static electricity can be quickly guided to the ground through the copper exposure block, avoiding the influence of static electricity on sensitive electronic elements on the circuit board, thereby protecting the stability and reliability of the electronic equipment. The ESD copper exposure block 22 is arranged on the ground grid 31 of the host system 3. According to Ohm's law V = IR, V is voltage, I is current, and R is resistance; reducing the resistance and improving the static electricity discharge efficiency, the smaller the resistance R of the discharge path, the easier the current I to pass through, so the speed of charge discharge is related to the impedance and area of the discharge path. A larger discharge area and a lower impedance can shorten the charge accumulation time and reduce the risk of static electricity discharge. Therefore, the ground grid 31 of the host system 3, the ESD ring ground 21 and the ESD copper exposure block 22 are arranged in the same line in the embodiment to form a large ground plane, thereby increasing the area of the discharge path of the ESD discharge circuit 2, and the resistance is smaller, so that the discharge current is easier to pass through. It should be noted that the ESD ring ground 21 and the ESD copper exposure block 22 are both made of copper exposure process.
[0032] As an alternative embodiment, as shown in Figure 2As shown, the outer edge of the ESD ring ground 21 is 0.1mm-1mm away from the edge of the PCB board 1. The inner edge of the ESD ring ground 21 is 0.1mm-0.1mm away from the ground grid 31 of the main control system 3. The outer edge of the ESD copper block 22 is 0.1mm-0.1mm away from the ground grid 31 of the main control system 3. The ESD copper block 22 is connected to the ESD ring ground 21 through the first bridging line 7. The ESD copper block 22 is connected to the ground grid 31 of the main control system 3 through the second bridging line 8 or the second connecting element 6 (the second connecting element is a resistor or a magnetic bead). The bridging line can be made of copper or a wire. By connecting the ESD copper block 22, the ESD ring ground, and the ground grid 31 of the main control system 3 through the bridging line or the connecting element, the discharge path area of the ESD discharge circuit 2 can be increased, which helps to disperse the electric charge and reduce the impedance of the discharge circuit to improve the discharge efficiency. The static electricity is no longer discharged through the metal shell of the touchpad, and the risk of static electricity accumulation and discharge can be effectively reduced even in an insulating shell, thereby improving the reliability and stability of the device.
[0033] As an alternative embodiment, the material of the insulating shell is resin or plastic. Compared with the metal shell, the touchpad made of resin or plastic is lighter and thinner, and has a lower cost.
[0034] The embodiment is only an example and does not mean that the utility model is limited to this implementation.
[0035] Embodiment two:
[0036] The difference between the embodiment two and the embodiment one is that the touch device includes the touchpad with the static electricity protection according to any one of the embodiment one. The touch device includes a notebook computer, a gamepad, and the like. The touch device of the embodiment adopts the touchpad provided in the embodiment one. The touchpad has a strong ESD static electricity discharge capacity, can effectively reduce the risk of static electricity discharge, avoids damage of components in the touchpad caused by static electricity impact, has a low cost, and is suitable for mass production.
[0037] The above description is only a preferred embodiment of the utility model, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the utility model. In addition, the features and embodiments can be modified to adapt to specific conditions and materials under the guidance of the utility model without departing from the spirit and scope of the utility model. Therefore, the utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the application belong to the protection scope of the utility model.
Claims
1. A touchpad with electrostatic discharge protection, characterized by, It comprises a PCB board (1), an ESD discharge circuit (2), a main control system (3), a touch chip (4) and an insulating shell. The ESD discharge circuit (2), the main control system (3) and the touch chip (4) are all arranged on the PCB board (1); the grounding grid (31) of the main control system (3) and the grounding wire of the touch chip (4) are both connected to a common grounding point through a first connecting element (5); the grounding grid (31) of the main control system (3) is laid on the PCB board (1); the ESD discharge circuit (2) is connected to the grounding grid (31) of the main control system (3). The PCB board (1), the ESD discharge circuit (2), the main control system (3) and the touch chip (4) are all arranged in the insulating shell. The ESD discharge circuit (2) comprises an ESD ring ground (21); the ESD ring ground (21) is arranged around the edge of the PCB board (1) and is connected to the grounding grid (31) of the main control system (3).
2. The touchpad with electrostatic discharge protection of claim 1, wherein, The ESD discharge circuit (2) further comprises at least one ESD copper exposure block (22); the ESD copper exposure block (22) is arranged on the grounding grid (31) of the main control system (3).
3. The touchpad with electrostatic discharge protection of claim 2, wherein, The outer edge of the ESD ring ground (21) is 0.1mm-1mm away from the edge of the PCB board (1).
4. The touchpad with electrostatic discharge protection of claim 3, wherein, The inner edge of the ESD ring ground (21) is 0.1mm-1mm away from the grounding grid (31) of the main control system (3).
5. The touchpad with electrostatic discharge protection of claim 3, wherein, The outer edge of the ESD copper exposure block (22) is 0.1mm-1mm away from the grounding grid (31) of the main control system (3).
6. The touchpad with electrostatic discharge protection of claim 3, wherein, The ESD copper exposure block (22) is connected to the ESD ring ground (21) through a first bridging line (7).
7. The touchpad with electrostatic discharge protection of claim 6, wherein, The ESD copper exposure block (22) is connected to the grounding grid (31) of the main control system (3) through a second bridging line (8) or a second connecting element (6).
8. The touchpad with electrostatic discharge protection of claim 6, wherein, The material of the insulating shell is resin or plastic.
9. The touchpad with electrostatic discharge protection of claim 1, wherein, A touch panel with electrostatic protection comprising any one of claims 1-9.
10. A touch device, characterized by