The anti-interference problem of capacitive touch screens is a very headache for touch screen manufacturers now. The anti-interference of capacitive touch screens is one of the performance requirements of touch screens. If the anti-interference is weak, it will affect the switchboard's touch screen effect, such as insensitive and inaccurate touch. The problem is very affected by the outside world.
We must first understand the structure of the capacitive touch screen and the principle of the capacitive touch screen, and then look for the reasons for the anti-interference of the capacitive touch screen. What is the general impact? The anti-interference problems of the capacitive touch screen are: screen jumping, inaccurate touch, or complete failure. Then first determine whether there are external factors, such as the power supply is not timely, the signal is weak, the antenna signal is not strong, these are common, only need to detect whether there are above phenomena, and adjust.
To solve the problem of anti-interference when designing a capacitive touch screen, the following adjustments must be made:
First, add virtual wiring in the blank area on the touch screen panel, that is, fill the wiring outside the display area, and connect the added virtual wiring to form a virtual circuit;
Secondly, the virtual circuit is connected with the ground part of the touch chip to form a shielding circuit. This design eliminates the interference of temperature, humidity, environmental electric field, reflection and other factors on the capacitive touch screen, and has low cost and high efficiency.
