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

Abstract

The invention relates to an electromagnetic shielding and sealing structure and method of a display screen with an external touch screen. Conductive foam on a liquid crystal screen is conducted with an enclosure and is in overlap joint with the enclosure, the conductive foam is compressed and deformed after a press force of a press device is received, so that a shielding thin film is in favorableoverlap joint with the enclosure, a complete electromagnetic shielding isolation layer is formed for the liquid crystal screen by overlap joint between the shielding thin film and the enclosure by theconductive foam, the external touch screen or a glass plate is fixedly connected with the enclosure for achieving sealing by a pasting mode, the installation operation difficulty can be reduced by separate processing of electromagnetic shielding and sealing, the electromagnetic shielding and sealing reliability of the display screen with the external touch screen is improved, the index requirement of national military standard on electromagnetic compatibility is met very well, and the demand of rain prevention is satisfied.

Description

technical field [0001] The invention relates to the technical field of touch screens, in particular to an electromagnetic shielding and sealing structure and method for a 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. The reinforced computer products need to meet the requirements of the harsh electromagnetic compatibility environment, and ordinary touch screens cannot meet the needs. For this reason, a resistive touch screen is mentioned in patent CN201110393137.4, which meets electromagnetic compatibility requirements by adding shielding glass inside the touch screen and combining a filter circuit; patent CN201510493246.1 mentions a touch screen with shielding function and its manufacturing method ...

AI Technical Summary

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

Images