As we all know,there are two types of touch screen,one is resistance touch screen,another is capacitance touch screen.This news mainly introduce the principle of capacitive touch screen,and the novel 19.3inch capacitive touch screen.
Unlike the resistive touch screens, the capacitive touch screens work with the current sensing of human beings.The sensor screen of the capacitive touch screen is a four-layer composite glass screen. The inner surface and the interlayer of the glass screen are each coated with a conductive layer, and the outermost layer is a thin layer of bauxite glass protective layer. When we touch the finger on the sensor screen, the electric field of the human body forms a coupling capacitor between the finger and the surface of the touch screen. For high-frequency current, the capacitor is a direct conductor, so the finger sucks a small current from the contact point. . This current is discharged from the electrodes on the four corners of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the position of the touch point by accurately calculating the ratio of the four currents.
Nowaday, more and more auto manufacturers are beginning to use LCD car monitors, and integrate multimedia navigation entertainment systems on the dashboard. This news maninly introduce a 19.3-inch capacitive touch screen LCD display ,which is mounted in the co-pilot position so as not to distract the attentions of driver.
The car monitor lcd display is mainly used for playing video, TV, games and entertainment, it is with touch function, which can give passengers a wonderful experience.
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