Capacitive Touch Screen Structure

- May 09, 2018-

Capacitive touch screens are coated with elongated electrodes on the four sides of the touch screen to form a low-voltage alternating-current electric field in the conductive body. When touching the screen, due to the human body electric field, a coupling capacitor is formed between the finger and the conductor layer, the current from the four-sided electrode will flow to the contact, and the current intensity is proportional to the distance from the finger to the electrode, and the controller located behind the touch screen The proportion and strength of the current are calculated and the position of the touch point is accurately calculated. The double glass of the capacitive touch screen not only protects the conductor and the sensor, but also effectively prevents external environmental factors from affecting the touch screen. Even if the screen is stained with dirt, dust or oil, the capacitive touch screen can still accurately calculate the touch position.