The production principle of mobile phone display

The inner surface and the middle layer of the glass screen are coated with a layer of ITO, the outermost layer is a thin protective layer of quartz glass, the middle layer of ITO coating is used as the working surface, screen manufacture，the four electrodes lead out four corners, and the inner layer of ITO is the shielding layer. layer. Ensure a good working environment.

When a finger touches the metal layer, a coupling capacitance will be formed between the user and the surface of the touch screen due to the electric field of the human body. Capacitors are direct conductors and the fingers draw a small current from the point of contact.

This current flows 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 finger to the four corners. The controller obtains the position of the touch point by accurately calculating the ratio of these four currents.

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