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Capacitive touch screen works
Dec 14, 2017

Capacitive screen to achieve multi-touch, by increasing the mutual capacitance of the electrode, simply put, that is, the screen is divided into blocks, in each region to set a group of mutual capacitance modules are working independently, so the capacitive screen can be independent Detection of the touch of the region, for processing, simply multi-touch.

Capacitive Technology Touch Panel CTP (Capacity Touch Panel) is the use of the human body's current sensing work. Capacitive screen is a four-layer composite glass screen, the inner surface of the glass screen and the interlayer coated with a layer of ITO (nano-indium tin metal oxide), the outermost layer is only 0.0015mm thick silica glass protective layer, laminated ITO coating Working face, the four corners lead to four electrodes, the inner layer of ITO to ensure that the working environment.

When the user touches the capacitive screen, the user's finger and the working surface form a coupling capacitor due to the human body electric field. Because the working surface is connected with a high-frequency signal, the finger absorbs a very small current, which flows respectively from the four corners of the screen On the electrode outflow, and in theory the current flowing through the four electrodes is proportional to the distance from the finger to the corners, the controller through the precise calculation of the four current ratio, come to the position. Can achieve 99% accuracy, with less than 3ms response speed.


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