Touch query one machine is one of the most convenient, simple, natural and practical human-computer interaction equipment. Today's knowledge: touch query one machine capacitive screen.
Touch-forespørgselsmaskine
Capacitive technology touch screen CTP (CapacityTouchPanel) uses the current induction of the human body to work. The capacitive screen is a four{{0}}layer composite glass screen. The inner surface and the interlayer of the glass screen are each coated with a layer of ITO (Nano Indium Tin Metal Oxide). The outermost layer is a protective layer of silica glass with a thickness of only 0.0015mm, and an interlayer ITO coating. As the working surface, four electrodes are drawn from the four corners, and the inner layer of ITO is the screen layer to ensure the working environment.
When the user touches the capacitive screen, due to the electric field of the human body, the user's finger and the working surface form a coupling capacitor. Because the working surface is connected to a high-frequency signal, the finger absorbs a small current, which flows from the four corners of the screen. In theory, the current flowing through the four electrodes is proportional to the distance from the finger tip to the four corners. The controller calculates the position of the four current ratios accurately. It can reach 99 percent accuracy and has a response speed of less than 3ms.
