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Is The External Screen of The Capacitive Touch Screen Made of Glass?


Published by JFCVision July 04,2019

Is the external screen of the capacitive touch screen made of glass? How does a capacitive touch screen implement touch functionality? Next, we will answer this question for you.


capacitive touch screen glass


The external screen of the capacitive touch screen is glass, and the capacitive touch screen technology uses the current sensing of the human body to work.

The capacitive touch screen is a four-layer composite glass screen. The inner surface and the interlayer of the glass screen are coated with a layer of ITO, the outer layer is a thin layer of glass protective layer, the interlayer ITO coating is used as the working layer, and the four corners are led out four electrodes. the inner layer of ITO is a shielding layer to ensure a good working environment.


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When the finger touches the metal layer, due to the human body electric field, the user and the surface of the touch screen form a coupling capacitor. For high-frequency current, the capacitor is a direct conductor, so the finger sucks a small current from the contact point.

This current The current flows from the electrodes on the four corners of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the position of the touch point by accurately calculating the ratio of the four currents.

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