What is the structure of the multipoint capacitive screen

- Dec 14, 2018 -


The construction method of multi-point capacitive screen, the construction of capacitive touch screen is mainly to coat the glass screen with a transparent thin film conductor layer, and then add a protective glass layer on top of the conductor layer, double glass design can completely protect the conductor layer and sensor.Capacitive touch screen is coated with thin electrodes on all sides of the touch screen to form a low voltage ac electric field in the conductive body.When touching the screen, due to the human electric field, a coupling capacitor will be formed between the finger and the conductor layer, and the current emitted by the four-side electrode will flow to the contact point. The strength of the current is proportional to the distance between the finger and the electrode, and the controller behind the touch screen will calculate the proportion and strength of the current and accurately calculate the position of the touch point.Capacitive screens are expensive, and they work by using the electrical current generated when the device is in contact with the screen, so you can manipulate them with your fingers, but not with non-living things like nails or pens.In addition, the precision of capacitive touch screen can reach several pixels in theory, but in fact the effective range is about 1 square centimeter.