The Differences Between PCAP touch and Resistive touch

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2023-12-03 22:30:24

Capacitive touch screen is a layer of transparent special metal conductive material pasted on the glass surface. When the finger touches the metal layer, the capacitance of the contact will change, making the frequency of the oscillator connected to it change. The touch position can be determined by measuring the frequency change to obtain information. Because the capacitance varies with temperature, humidity or grounding conditions, its stability is poor, and often leads to drift.

The 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 metal oxide) coating. ITO has good conductivity and transparency. When touching, the ITO on the lower layer of the film will contact the ITO on the upper layer of the glass. The corresponding electrical signal will be sent out through the sensor and sent to the processor through the conversion circuit. It will be converted into the X and Y values on the screen through calculation, and the click action will be completed and displayed on the screen.

working principle:

The CTP (Capacity Touch Panel) of the capacitive technology touch screen works by using the current sensing of the human body. The capacitance screen is a four-layer composite glass screen. The inner surface and interlayer of the glass screen are coated with a layer of ITO (nano indium tin metal oxide). The outermost layer is a protective layer of silica glass with a thickness of 0.0015mm. The interlayer ITO coating is used as the working surface, four electrodes are drawn from four corners, and the inner ITO is used as the screen layer to ensure the working environment.