The capacitive touch screen panel uses the current induction of the human body to work. The capacitive touch screen panel is a four-layer composite glass screen. The inner surface of the glass screen and the interlayer are each coated with a layer of ITO. The outer layer is a thin layer of silica glass protective layer, the interlayer ITO coating is used as the working surface, and four electricity is drawn from the four corners. The inner ITO is a shielding layer to ensure a good working environment. When the finger touches the metal layer.
Due to the electric field of the human body, a coupling capacitance is formed between the user and the surface of the touch screen. For high-frequency currents, capacitors are direct conductors. Then the finger draws a small current from the contact point. This current flows from the electricity on the four corners of the touch screen. And the current flowing through these four electricity is proportional to the distance from the finger to the four corners. The controller passes the accurate calculation of the proportions of these four currents. Get the location of the touch point.
This touch screen uses pressure sensing for control. The main part of the resistive touch screen is a resistive film screen that fits well with the surface of the display. This is a multi-layer composite film, which uses a glass or hard plastic plate as the base layer. The surface is coated with a transparent oxide metal conductive layer. It is covered with a layer of hardened outer surface, smooth and anti-scratch plastic layer. Its inner surface is also coated with a layer of coating. There are many small (less than 1/1000 inch) transparent isolation points between them to separate and insulate the two conductive layers.
When a finger touches the screen, the two conductive layers are connected at the touch point. , The resistance changes, and signals are generated in both directions. Then send it to the touch screen controller. The controller detects this contact and calculates the position of (X, Y). Then it operates according to the way of simulating a mouse. This is the basic principle of resistive technology touch screens.
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