There are many electronic products around, so we often come into contact with capacitive touch screens. I wonder if you know about it? It doesn’t matter if you don’t understand, let’s take a look today. Capacitive touch screens use the current induction of the human body to work. The capacitive touch screens glass is a four-layer composite glass screen. The inner and outer surfaces of the glass screen and the interlayer are each coate with a layer of ITO. The outermost layer is a thin layer of silica glass protective layer, and the interlayer ITO coating is used as the working surface. Four electrodes are drawn on the four corners, and the inner ITO is a shielding layer to ensure an outstanding working environment.
When the finger touches the metal layer, because of the electric field of the human body, the user and the surface of the touch screen form a coupling capacitor. For high-frequency currents, capacitors are direct conductors. So the finger draws a small current from the contact point. This current flows from the electrodes on the four corners of the touch screen. And the current flowing through these four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position of the contact point by accurately calculating the four current shares.
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