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Capacitive Touch Screen--Chenghao manufacturer

September 25, 2023

Capacitive touch screen technology utilizes the human body's current sensing for operation. A capacitive touch screen is a four layer composite glass screen, with an ITO coating on the inner surface and interlayer respectively. The outermost layer is a thin layer of silica glass protective layer, and the interlayer ITO coating serves as the working surface. Four electrodes are introduced from the four corners, and the inner ITO is a shielding layer to ensure a good working environment. When a finger touches a metal layer, due to the human electric field, a coupling capacitor is formed between the user and the touch screen surface. For high-frequency current, the capacitor is a direct conductor, so the finger absorbs a small amount of current from the contact point. This current flows out from the electrodes on the four corners of the touch screen, and the current flowing through these four electrodes is proportional to the distance from the fingers to the four corners. The controller accurately calculates the proportion of these four currents to determine the position of the touch point.Today, I will share with you some small content about capacitive touch. If you need to learn more, please contact us.


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      September 25, 2023

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