The capacitive touch screen industrial technology uses the current induction of the human body to work. The capacitive touch screen is a four-layer composite glass screen. The inner surface of the glass screen and the interlayer are each coated with a layer of ITO. The outermost layer is a thin protective layer of silica glass. The sandwich ITO coating serves as the working surface. Four electrodes are drawn from the four corners. The inner ITO is a shielding layer to ensure a good working environment. When a finger touches the metal layer, due to the electric field of the human body, a coupling capacitance is formed between the user and the surface of the touch screen.
For high-frequency currents, capacitors are direct conductors. Then 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 passes the accurate calculation of the proportions of these four currents. Get the location of the touch point.
Use the capacitor's blocking function. In addition to the DC signal at the input of the capacitor, there is also AC or pulsating DC. Capacitors are for pure direct current, as opposed to open circuits. And some other non-DC signals are mixed or added to the input signal. (Mainly for high frequency signals). However, it passes through the capacitor and acts as a bypass. When the capacitor is used for filtering, it is generally connected in parallel at both ends of the power supply to be filtered.
Explanation: AC power can pass through the capacitor. But when you connect the capacitor to the AC circuit. Due to the continuous charging and discharging of capacitors. Therefore, the charge on the plate of the capacitor has an obstructive effect on the charge that moves in a direction. In physics, we call this hindering effect is capacitive reactance. Therefore, the capacitor still has an obstructive effect on the alternating current.
We call the obstructive effect of capacitors on alternating current is capacitive reactance. The electric capacity is large, and the alternating current can easily pass through the capacitor.Also it shows that the capacitance is large, and the obstructive effect of the capacitor is small. The frequency of alternating current is high, and alternating current can easily pass through the capacitor. It shows that the frequency is high, and the obstructive effect of the capacitor is also small.
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