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Tft capacitive touch manufacturers take you to understand: capacitive touch screen to achieve multi-touch


The manufacturer of Tft capacitive touch tells you that the capacitive touch screen is composed of driving electrodes and receiving electrodes. The driving electrodes emit low-voltage and high-frequency signals and project them to the receiving electrodes to form a stable current. When the human body touches the capacitive screen, because the human body is grounded, the fingers are connected to the capacitor. The screen forms an equivalent capacitance.

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The manufacturer of Tft capacitive touch tells you that high-frequency signals can flow into the ground through this equivalent capacitance, so the amount of charge received by the receiving end is reduced. The manufacturer of Tft capacitive touch tells you that when the finger is close to the transmitter, the charge drops more obviously. Finally, the contact point is determined according to the current intensity received by the receiving end. As for multi-touch, to put it simply, the screen is divided into blocks. Each group of mutual capacitance modules in each area work independently, and the capacitive screen can independently detect the touch situation of each area, and multi-touch can be realized after processing.
Tft capacitive touch manufacturers tell you that the touch screen ctp (capacitive touch screen) uses current sensors from the human body. The capacitive screen is a four-layer composite glass screen. The inner surface and the middle layer of the glass screen are respectively coated with ito (nano indium tin oxide). The manufacturer of Tft capacitive touch tells you that the outer layer is a 0.0015mm thick quartz glass protective layer, the middle layer is coated with an ito working surface, the four corners form four electrodes, and the inner layer is a shielding layer to ensure the working environment.
The manufacturer of Tft capacitive touch tells you that when the user touches the capacitive screen, due to the action of the electric field, the user’s finger forms a coupling capacitance with the working surface. Because there are high-frequency signals on the working surface, the finger absorbs very small currents and flows out from the electrodes at the four corners of the screen. , The current flowing through the four electrodes is theoretically proportional to the distance from the finger to the four corners. The response speed is less than 3ms, and the accuracy can reach 99%.

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