[時事閒聊] How does the phone screen recognize touch?

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The application of mobile phone touch screen is mainly based on resistive touch screen and capacitive touch screen.

The resistive touch screen uses the voltage divider principle to generate voltages representing the X coordinate and the Y coordinate, and then the software recognizes the coordinate change and performs the corresponding function. smart phone news ,        The resistive touch screen has many layers and poor light transmittance. Only single touch is supported during use. Although it is durable, it has a poor sense of use and cannot meet the needs of use.

Capacitive touch screen is the mainstream configuration of mobile phone screen. Support multi-touch, high sensitivity, sensitive induction, more convenient to use. The capacitive touch screen can sense the current when the finger touches in time. The finger current flows to the contact point and forms a coupling capacitance with the conductor layer. After the screen controller receives the current, it can calculate the current strength and operate accordingly.

Capacitive touchscreens are widely used in mobile phones and tablets. The capacitive touch screen can work only when it senses the current of the human body, avoiding the touch of other items, and has better performance in terms of dustproof, waterproof and wear-resistant. The capacitive touch screen has a long life and can generate a signal without pressure, just touch it directly.

However, there will be some interference factors in the use of the touch screen of the mobile phone. Electrostatic discharge, strong magnetic field, oil, sweat, water vapor and other conductive substances on the screen may cause permanent damage to the phone screen. When the ambient temperature and humidity are not in line with the working environment, or factors such as low voltage, instability, physical shock and vibration, it will cause damage to the mobile phone touch screen, resulting in the phone screen being scrapped. Therefore, it is necessary to test the touch screen of the mobile phone.



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