Capacitive screen
Capacitive touch screens work using the body's current sensing. 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 capacitance, because the working surface is connected with a high-frequency signal, so the finger absorbs a very small current, this current flows out from the electrodes on the four corners of the screen respectively, and theoretically the current flowing through the four electrodes is proportional to the distance from the finger to the four corners, and the controller obtains the position through the precise calculation of the four current proportions.
Compared with resistive screens, capacitive screens only need to be touched without pressure to generate a signal, and capacitive touch screens only need to be corrected once or not at all after production, and are also superior to resistive technology in terms of light loss and system power consumption. Overall, capacitive technology is wear-resistant, long-lasting, low-maintenance, and multi-touch.