Resistance touch screen

Abstract

The invention discloses a resistance touch screen, belonging to an electronic field. The outermost layer of the resistance touch screen is a touchpad and then a piece of shielding glass is arranged below the touchpad; a liquid crystal display is covered by a shielding net; the touchpad is further connected with a filtering circuit; and the filtering circuit is internally provided with a feed-through capacitor and is used for filtering an output signal of the touchpad. According to the invention, the touchpad is arranged on the outermost layer of a chassis display window and the shielding glass is arranged on the second layer, so that the touch can be realized by directly contacting the touchpad; when the touchpad is pressed, the problem that generated contact points are inaccurate is avoided and the precision of the touch screen is improved. Furthermore, the shielding net and the filtering circuit are arranged and the filtering circuit is internally provided with the feed-through capacitor, so that higher harmonics which are higher than cut-off frequencies of the resistance touch screen are filtered out and signals are effectively shielded.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a resistive touch screen. Background technique [0002] Existing touch screens can be generally divided into several types according to their working principles: resistive, capacitive, infrared, surface acoustic wave, electromagnetic, and pressure sensing. At present, resistive and capacitive touch screens are the most widely used. [0003] The interface circuit of the resistive touch screen is mainly a serial port data circuit and a USB data interface circuit, generally there are four-wire system and five-wire system and other types. The screen body of the resistive touch screen is a multi-layer composite film. The four-wire resistive touch screen is covered with two layers of transparent conductive layer ITO between the surface protective coating and the base layer. The two layers correspond to the X and Y axes respectively. The transparent insulating particles are insulated, and th...

AI Technical Summary

Problems solved by technology

[0006] In the touch screen of the prior art, the user directly touches the shielding glass to realize the touch, and the shielding glass is exposed to the outside and is easily deformed, resulting in unevenness of the shielding glass. When the shielding glass is pressed, the problem of inaccurate contact points will occur, which will affect the accuracy of the touch screen.

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