Externally-mounted touch screen high-strength electrostatic discharge protection structure
By integrating the shielding film and conductive pad design on the touch screen and combining the ESD protection circuit, the damage problem of the touch screen in a high-static environment is solved, and high-intensity electrostatic discharge protection and electromagnetic compatibility are improved to protect the touch IC.
Patent Information
- Application Number
- CN202422072686.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-26
AI Technical Summary
Modern semiconductor devices are sensitive to electrostatic discharge (ESD). Especially in high-thermal dry wild environments, touch screens are susceptible to damage, and existing protective measures are insufficient, resulting in IC damage.
A high-strength electrostatic discharge protection structure of an external touch screen is designed, including a shielding film, conductive pad and ESD protection circuit, which enhances the electrostatic protection capability through continuous conductive overlap and the shell conduction.
Effectively prevent the touch screen from being damaged under electrostatic discharge up to 25KV, protect the touch IC, improve electromagnetic compatibility, and reduce the impact of external electromagnetic harassment on the internal circuits of the equipment.
Smart Images
Figure CN223080206U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of rugged computer technology, and relates to an external touch screen high-strength electrostatic discharge protection structure. Background Art
[0002] At present, the scale of modern semiconductor devices is increasing day by day, while their operating voltage is gradually decreasing. This trend has led to a significant increase in the sensitivity of semiconductor devices to external electromagnetic interference. Problems such as interference caused by electrostatic discharge (ESD) to circuits, damage to components, CMOS circuits, and interface circuits have attracted extensive attention. In the field of military electronic equipment, ESD is even regarded as an important part of electromagnetic compatibility testing.
[0003] During the production and use of electronic products, the operator is the most important static electricity source that cannot be ignored. When a person wears fabrics made of insulating materials and their shoes are also insulated from the ground, static charges may accumulate when the person moves on the ground. When these charged bodies come into contact with components or devices connected to the ground, electrostatic discharge will occur. In particular, in the usage scenario of rugged tablets, military personnel are often in hot and dry field environments, where static electricity is more likely to be generated, and the static voltage may even reach up to 25 KV. The first to be affected is the touch screen of the tablet. If the electrostatic discharge protection measures of the touch screen are not well designed, it is extremely easy to cause damage, especially the touch IC may suffer irreversible damage. This is because the area of each component in the IC is very small, and the parasitic capacitance is also correspondingly small (usually the circuit function requires a very small parasitic capacitance), so a small amount of static charge can generate a very high static voltage. At the same time, the power tolerance of each component is usually very small, so electrostatic discharge can easily damage the IC.
[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Utility Model
[0005] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.
[0006] The embodiments of the present disclosure provide an external touch screen high-strength electrostatic discharge protection structure, which effectively improves the electrostatic discharge protection ability of the touch screen through innovative structural design and protection mechanisms, and ensures the stable operation of the rugged tablet in harsh environments.
[0007] In some embodiments, the external-mounted touch screen high-intensity electrostatic discharge protection structure includes: a touch screen, a shielding film, a conductive gasket, and a display panel; a three-layer stepped layer is designed at the connection between the touch screen and the display panel, a shielding film is provided at the step of the touch screen, the display panel is adhesively fixed to the touch screen through the outermost step, and the display panel fixes the shielding film through the inner two layers of steps. A conductive gasket is further provided at the connection between the display panel and the touch screen, and the conductive gasket is located at the inner two layers of steps.
[0008] Optionally, the display panel is adhesively fixed to the touch screen through a fixing adhesive.
[0009] Optionally, the conductive gasket is a Z-shaped conductive gasket, which realizes conductive continuous lap joint with the shielding film on the touch screen.
[0010] Optionally, the touch screen is designed with an FPC circuit board of a touch IC, and an ESD protection circuit is designed on the circuit board.
[0011] Optionally, the display panel fixes the shielding film through an OCA adhesive.
[0012] An external-mounted touch screen high-intensity electrostatic discharge protection structure provided by an embodiment of the present disclosure can achieve the following technical effects:
[0013] High-intensity electrostatic discharge protection: Through the design of a shielding film with high-efficiency electromagnetic shielding efficiency and a "Z"-shaped conductive gasket, the utility model can effectively prevent the reinforced flat touch screen from being damaged during the electrostatic discharge process, especially providing high-intensity protection against electrostatic discharge up to 25 KV.
[0014] Improved electromagnetic compatibility: The utility model not only focuses on the protection of electrostatic discharge, but also enhances the electromagnetic compatibility of the whole machine display window through designs such as conductive continuous lap joint and housing conduction, reducing the influence of external electromagnetic interference on the internal circuit of the device.
[0015] Protect the touch IC from damage: Since the components in the touch IC have small area, small parasitic capacitance and low power tolerance, they are particularly sensitive to electrostatic discharge. The utility model can effectively protect the touch IC from electrostatic discharge damage and avoid irreversible damage by designing an ESD protection circuit in the FPC circuit board of the touch IC and adding a touch IC ESD protection mechanism at the system level.
[0016] The above general description and the following description are only exemplary and explanatory, and are not used to limit this application. Description of the Drawings
[0017] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and wherein:
[0018] Figure 1 is a schematic structural diagram of an external touch screen high-strength electrostatic discharge protection structure provided by an embodiment of the present disclosure.
[0019] Reference numerals: 1, touch screen; 2, shielding film; 3, conductive gasket; 4, fixing glue; 5, display panel. Detailed implementation manners
[0020] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the drawings. The attached drawings are only for reference and illustration purposes and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner.
[0021] In the embodiments of the present disclosure, terms such as "first", "second", etc. in the specification, claims and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.
[0022] In the embodiments of the present disclosure, the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and their embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.
[0023] In addition, the terms "arranged", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. 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 specific circumstances.
[0024] Unless otherwise specified, the term "plurality" means two or more.
[0025] Combined with Figure 1 As shown, the embodiments of the present disclosure provide an externally mounted touch screen high-strength electrostatic discharge protection structure. First, a shielding film with high-efficiency electromagnetic shielding performance is integrated on the touch screen. A "Z"-shaped conductive gasket is used to make the touch screen with the shielding film and the reinforced flat display panel conductively continuous, and the conduction is increased with the shell through the conductive surface lap joint to increase the redundancy of static electricity; secondly, an ESD protection circuit is designed in the FPC circuit board of the touch IC of the touch screen.
[0026] Specifically, it includes: a touch screen, a shielding film, a conductive gasket, and a display panel; three stepped layers are designed at the connection between the touch screen and the display panel. A shielding film is arranged at the stepped part of the touch screen. The display panel is fixedly pasted to the touch screen through the outermost stepped layer, and the shielding film is fixed by the inner two stepped layers of the display panel. A conductive gasket is also arranged at the connection between the display panel and the touch screen, and the conductive gasket is located at the inner two stepped layers.
[0027] In some embodiments, the display panel is fixedly pasted to the touch screen through a fixing adhesive.
[0028] In some embodiments, the conductive gasket is a "Z"-shaped conductive gasket, which realizes conductive continuous lap joint with the shielding film on the touch screen.
[0029] In some embodiments, the touch screen is designed with an FPC circuit board of a touch IC, and an ESD protection circuit is designed on the circuit board.
[0030] In some embodiments, the display panel bonds the shielding film through an OCA adhesive.
[0031] It should be noted that the specific working process of the ESD protection circuit is as follows: After the machine is turned on and runs, the touch IC is normally powered on and initialized. A monitoring and protection process for the normal operation of the touch IC is added to the system, and the working state of the IC is detected at any time. If it works normally, the IC is not reset. If the work is abnormal, especially after applying high-strength static electricity, the touch IC is reset to keep the touch IC working normally at any time. The IC detection time can be set according to the actual situation.
[0032] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or substituted for parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.
Claims
1. An external-mounted touch screen high-strength electrostatic discharge protection structure, characterized in that It includes a touch screen (1), a shielding film (2), a conductive gasket (3) and a display panel (5); at the connection between the touch screen (1) and the display panel (5), three stepped layers are designed. The shielding film (2) is arranged at the stepped part of the touch screen (1). The display panel (5) is fixedly pasted to the touch screen (1) through the outermost stepped layer, and the shielding film (2) is fixed by the inner two stepped layers of the display panel (5). A conductive gasket (3) is also arranged at the connection between the display panel (5) and the touch screen (1), and the conductive gasket (3) is located at the inner two stepped layers.
2. The external-mounted touch screen high-intensity electrostatic discharge protection structure according to claim 1, wherein The display panel (5) is fixedly pasted to the touch screen (1) through a fixing glue (4).
3. The external-mounted touch screen high-strength electrostatic discharge protection structure according to claim 1, wherein, The conductive gasket (3) is a Z-shaped conductive gasket, which realizes conductive continuous lap joint with the shielding film (2) on the touch screen (1).
4. The external-mounted touch screen high-intensity electrostatic discharge protection structure according to claim 1, characterized in that The touch screen (1) is designed with an FPC circuit board of a touch IC, and an ESD protection circuit is designed on the circuit board.
5. The external touch screen high-intensity electrostatic discharge protection structure according to claim 1, characterized in that The display panel (5) fixes the shielding film (2) through an OCA glue.