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Principle of capacitive touch screen

Pubdate : 2020-05-22 Clicks: Author : admin

A simple capacitive touch screen is a four-layer composite glass plate with a layer of ITO material. ITO is an indium tin oxide material, which is transparent and conductive, and is suitable for manufacturing touch screens.

When a finger touches a certain part on the screen, it will form a coupling capacitor with the ITO material and change the capacitance at the contact point. There will be wires in the four corners of the screen. Because alternating current can pass through the capacitor, the current of the four wires will run to the contact, and the current is related to the distance to the contact. The chip inside the mobile phone can analyze the current of the four corners, and the position of the contact can be obtained by calculation.


The finer capacitive screen is a projected capacitive screen. It uses an ITO array of eroded candles, and these ITO layers form multiple horizontal and vertical electrodes by erosion. Each part of the ITO component also has a sensing function.

When a finger touches a certain part, it is coupled with the array capacitor, which changes the electric field on the screen, and the sensor and chip analyze the current change in the electric field, and the position of the contact can be sensed. Compared with the previous four-corner current capacitive screen, this capacitive screen can realize multi-touch and is more widely used.
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