The working principle of Dongguan capacitive screen

Dongguan capacitive screen uses the current induction of the human body to work. The capacitive touch screen is a four-layer composite glass screen. The inner surface and the interlayer of the glass screen are each coated with a layer of ITO. The outermost layer is a tomographic silica glass protective layer. The interlayer ITO coating is used as the working surface, and the four tops are drawn out. Four electrical levels, the inner ITO is used as a shielding layer to ensure a good office environment.
When a finger touches the metal layer, due to the electric field of the human body, the user and the surface of the touch screen form a coupling capacitor. For high-frequency current, the capacitor is an immediate electrical conductor, so the finger draws a small current from the contact point. This current is discharged from the electrical levels on the four corners of the touch screen, and the current flowing through these four electrical levels is positively correlated with the distance between the finger and the four corners. The control board calculates the proportion of these four currents based on accurate calculations. Touch the spot.
The basic structure of the capacitive touch screen is: the substrate is a single-layer plexiglass, and a layer of fully transparent conductive plastic film is forged on the inner and outer surfaces of the plexiglass. Each of the four transparent conductive plastic films on the outer surface There is a long and narrow electrical level on the upper cone. The principle is: when a finger touches the capacitive touch screen, a high-frequency data signal is connected to the working surface. At this time, the finger and the touch screen working surface form a coupling capacitor, which is equivalent to an electrical conductor. Because the working surface has high-frequency data signals, the finger touches When a small current is drawn at the touch point, this small current is discharged from the electrical levels on the four corners of the touch screen. The current flowing through the four electrical levels is proportional to the linear distance from the finger to the four corners. The calculation of the proportions of the four currents can get the coordinate value of the contact point.
The above explained is the working principle of Dongguan capacitive screen, I hope it will be helpful to you after reading it. If you want to know more about Dongguan capacitive screen related information, please contact customer service online or call our company's service hotline ( The upper right corner of the website) for consultation, we will wholeheartedly provide you with quality service!