Capacitive Touch Screen

According to the type of sensor, the Touch screen is roughly divided into infrared type, resistance type, surface acoustic wave type and Capacitive Touch Screen four kinds. The design of capacitive touch screen is reasonable, but the problem of image distortion is difficult to be solved.

Capacitive Touch Screen

The touch screen works by using the body's current induction process. A special transparent metal conductive substance is coated on the surface of the glass. When a conductive object touches the glass, it changes the capacitance of the contact, so as to detect the position of the touch. But touching a non-conductive object with a gloved hand or hand does not respond because of the addition of a more insulating medium.

Capacitive touch screen can sense light and fast touch, anti-scratch, not afraid of dust, water and dirt influence, suitable for harsh environment. However, capacitance varies with temperature, humidity or environmental electric field, so its stability is poor, low Resolution and easy to drift.