Absorbing materials solve electromagnetic interference of electronic touch screens

The main function of the absorbing material is to absorb the coupled electromagnetic waves to prevent the superposition of electric waves and eliminate the redundant electric waves in the intelligent electronic system. The absorbing material can be cut into shape and attached to the back of the touch panel or cable to resist electromagnetic interference EMI and optimize the performance of the touch screen. .

The projected capacitive touch screen of smart electronic devices is susceptible to electromagnetic interference, and the EMI voltage from internal and external electromagnetic interference will be capacitively coupled to the touch screen device. These electromagnetic interference voltages can cause phone movement in the touch screen, which may confuse the measurement of charge movement when the finger touches the screen, and affect the sensitivity and touch accuracy of the touch screen. The solution can be to use absorbing materials to absorb electromagnetic waves and eliminate interference.

The interference coupling path involves parasitic effects. For many smart electronic devices, the battery charger constitutes the main interference source of the touch screen. When a finger touches the touch screen, the generated capacitance causes the charger interference coupling circuit to be closed, and the charger is internally shielded. The quality of the design and whether there is a proper charger grounding design are the key factors that affect the coupling interference of the charger.

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