The structure of capacitive touch screen is mainly to coat the glass screen with a transparent film body layer, and then add a protective glass outside the conductor layer. The double glass design can completely protect the conductor layer and the sensor.
Capacitive touch screen is plated with long and narrow electrodes on all four sides of the touch screen to form a low voltage ac electric field in the conductive body. When touching the screen, due to the electric field of the human body, a coupling capacitance will be formed between the finger and the conductor layer. The current from the four-side electrode will flow to the electric shock, and the current strength is proportional to the distance between the finger and the electrode. The controller behind the touch screen will calculate the proportion and strength of the current and accurately calculate the position of the touch point. The double glass of the capacitive touch screen can not only protect the conductor and the sensor, but also prevent the 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.
Capacitive touch screens are glass coated with a transparent layer of special metal conductive material. When a finger touches the metal layer, the capacitance of the contact changes, causing the frequency of the oscillator connected to it to change. By measuring the frequency change, the position of the touch can be determined to obtain information. Because the capacitance varies with temperature, humidity or grounding conditions, its stability is poor, and drift often occurs.
