Electromagnetic shielding and sealing structure and method of display screen with external touch screen

Abstract

An electromagnetic shielding and sealing structure and method for a display screen with an external touch screen. The conductive foam on the liquid crystal screen and the casing are conductively overlapped with each other. After receiving the pressing force of a pressing device, the conductive foam is Compression deformation, so that the shielding film forms a good overlap with the casing through the conductive foam, and the shielding film forms a complete electromagnetic shielding isolation layer for the LCD screen through the overlapping of the conductive foam and the casing, and the external touch screen or glass plate passes through The method of pasting is fixedly connected to the casing to achieve sealing. By treating the electromagnetic shielding and sealing separately, the difficulty of installation and operation can be reduced, and the reliability of the electromagnetic shielding and sealing of the display screen with the external touch screen can be improved. It can better meet the requirements of electromagnetic compatibility in the national military standard and meet the needs of rain protection.

Description

technical field [0001] The invention relates to the technical field of touch display screens, in particular to an electromagnetic shielding and sealing structure and method of a display screen with an external touch screen. Background technique [0002] In order to better meet the needs of operation and use, touch screens are widely used in human-computer interaction devices, especially external touch screens are widely used as display control devices because of their flat structure and beautiful appearance. For strengthening computer products, it is necessary to meet the requirements of the harsher electromagnetic compatibility environment, and ordinary touch screens cannot meet the needs. To this end, patent CN201110393137.4 mentioned a resistive touch screen, which meets the electromagnetic compatibility requirements by adding shielding glass inside the touch screen and combining filter circuits; patent CN201510493246.1 mentioned a touch screen with shielding function and...

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Problems solved by technology

The shielding method of the touch screen itself is mentioned in the above patents, but the patents CN201110393137.4 and CN201510493246.1 do not specify how to install it. Although the installation structure is mentioned in the patent CN201510509848.1, it is limited to the installation of the built-in touch screen and cannot be applied external touch screen

To sum up, the shielding treatment of the traditional external touch screen is to paste a conductive shielding film on the contact surface between the inside of the touch screen and the case, so that it overlaps with the case to form a shield. The shielding performance depends on the lapping effect. The smaller the resistance, the better the shielding effect. , but the external touch screen cannot increase the compression structure, and can only be installed by bonding, which can easily cause poor conductive contact and reduce the shielding performance. At present, there is no good solution

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