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What is the technical principle of the touch screen

The touch screen senses the touch of our fingers because when a finger touches a specific location on the screen, it is equivalent to sending a precise electronic signal to the screen. There are many types of touch screens, roughly divided into resistive touch screens and capacitive touch screens. The most widely used at present is " capacitive touch screen ".

The first layer of our mobile phone is the protective layer, and the bottom layer is the touch sensor layer. The touch sensor layer is coated with a thin layer of conductive metal, such as indium tin oxide. This touch sensor layer is actually composed of two layers, each layer has tiny electrodes at regular intervals. The two layers overlap each other to form a checkerboard-like grid that fills the screen. Of course, this The spaces in it are much denser than a chessboard.

We can't see them from offscreen because they're mostly transparent and fill the entire screen. Each grid on these "chessboards" is an electrode, and they all have a different "charge" number. Without touching the screen, they are in a balanced state. Once your finger touches the screen, because the finger is a conductor, it will bring "disturbance" to the electrodes under the screen, that is, it will bring new charges, which will destroy the original balance.

We're using a capacitive touchscreen as an example here, so the upshot of this balance is that your finger changes the "capacitance" at the point it touches the screen. The change in capacitance will be sensed by the chip inside the phone. Chips and sensors calculate a series of changes in electric fields, currents, etc., and then calculate the position of the point where your finger touches the screen.

So the premise of all this is that your finger is a conductor, but the glove is not, it is an insulator, so there is no response to touching the screen.