Hangzhou Xuhong Technology Co.,Ltd
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The interference problem of capacitive screens may be caused by various factors, including static electricity, high temperature, conductive media such as oil and sweat, magnetic field, and unstable voltage. To address these issues, the following methods can be used:
1. Design virtual wiring: Add virtual wiring to the blank area of the touch screen panel and connect the virtual wiring to form a virtual circuit. Then connect the virtual circuit to the grounding part of the touch chip to form a shielding circuit. This design can eliminate interference from temperature, humidity, environmental electric field, reflection and other factors on capacitive touch screens, solving interference problems at low cost and high efficiency.
2. Use capacitive coupling and circuit design: For electromagnetic interference, anti-interference of capacitive touch screens can be achieved by rectifying the circuit. For example, connect a Y-shaped capacitor between a strong and weak ground, and select an appropriate voltage withstand value. Meanwhile, compensating for interference coupling paths and parasitic effects through effective circuit design.
3. Apply conductive film: Apply conductive film to the touch screen and ground it to reduce interference.
4. Use a common mode choke coil: Connecting a common mode choke coil in series between the positive and negative terminals of the touch power supply can help reduce interference.
5. Choose appropriate inductance: In the power supply section, 100-200 milliohms of inductance can be connected in series to further reduce interference.
Please note that the above methods are not all solutions, and the specific methods may vary depending on the device and application scenario. Therefore, when solving the interference problem of capacitive screens, it is recommended to analyze and try based on specific situations to achieve the best effect.
capacitive screens:https://www.auo-lcd.com/products/touch/capacitive/
