Capacitive touch screen is in the glass surface affixed to a layer of transparent special metal conductive material. 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 touch position information can be determined by measuring the frequency change. As the capacitance with temperature, humidity or ground conditions vary, so the stability of poor, often produce drift phenomenon.
Resistive touch screen is a sensor, basically a thin film plus glass structure, film and glass adjacent to the side are coated with ITO (nano indium tin oxide oxide) coating, ITO has a good conductivity and transparency Sex. When the touch operation, the bottom of the ITO ITO will touch the glass on the ITO, the sensor through the corresponding electrical signal, through the conversion circuit to the processor, through the operation into the screen X, Y value, and complete the point Select the action and present it on the screen.
Capacitive technology Touchscreen CTP (Capacity Touch Panel) is the use of the body's current sensing work. The 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, sandwich ITO coating For the face, four corners lead to four electrodes, the inner layer of ITO screen layer to ensure that the working environment.
Resistive touch screen works mainly through the principle of pressure sensing to achieve the operation of the screen content and control, this touch screen screen part is a very consistent with the display surface of the multi-layer composite film, which is the first layer of glass or plexiglass The bottom layer, the second layer for the compartment, the third layer for the multi-resin surface, the surface is also coated with a layer of transparent conductive layer, and then covered with a layer of the outer surface of the hardened, smooth scratch plastic layer.
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What is the difference between capacitive touch screen and resistive touch screen?
Popular capacitive touch screen is to support multi-touch human-computer interaction, ordinary resistive touch screen can only be a single point of touch.
For example: Apple iphone, Nokia N8, Nokia E7 for the capacitive touch screen, you can use both hands at the same time touch the screen to operate, web browsing and other operations.
Nokia 5800, n97; HTC d600 s90,5230, etc. for the resistive touch screen, only a single point of operation.