A capacitive touch screen is a layer of transparent special metal conductive material attached to the surface of the glass. When the finger touches the metal layer, the capacitance of the contact changes, so that the frequency of the oscillator connected to it changes, and the position of the touch can be determined by measuring the frequency change. Since the capacitance varies with temperature, humidity, or grounding conditions, its stability is poor, and drift often occurs.
Resistive touch screen is a kind of sensor, which is basically a film plus glass structure. The adjacent side of the film and glass is coated with ITO (nano-indium tin oxide) coating. ITO has good conductivity and transparency. Sex. When the touch operation is performed, the ITO under the film contacts the ITO on the upper layer of the glass, and the corresponding electrical signal is transmitted through the inductor, sent to the processor through the conversion circuit, and converted into X and Y values ​​on the screen by calculation, and the completion point is completed. The selected action is presented on the screen.
working principle:Capacitive Touch Panel CTP (Capacity Touch Panel) uses the current sensing of the human body to work. The capacitive screen is a four-layer composite glass screen. The inner surface of the glass screen and the interlayer are coated with a layer of ITO (nano-indium tin oxide). The outermost layer is a 0.0015mm thick bauxite protective layer with an interlayer ITO coating. As the working surface, four corners lead to four electrodes, and the inner layer of ITO is the screen layer to ensure the working environment.
The working principle of the resistive touch screen is mainly to realize the operation and control of the screen content through the principle of pressure sensing. The touch screen body part is a multi-layer composite film which is very compatible with the surface of the display, wherein the first layer is glass or plexiglass. The bottom layer, the second layer is a partition layer, the third layer is a multi-resin surface layer, and the surface is also coated with a transparent conductive layer, and the surface is covered with a plastic layer with a hardened surface and a smooth scratch-resistant outer surface.
In general, a capacitive touch screen is a human-computer interaction method that supports multi-touch, and a conventional resistive touch screen can only perform single-point touch.
For example: Apple iphone, Nokia N8, Nokia E7 is a capacitive touch screen, you can use both hands to touch the screen at the same time to operate, web page browsing and other operations
Nokia 5800, n97; HTC d600 s90, 5230, etc. are resistive touch screens, which can only be operated at a single point.
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