Causes of led screen large-scale static electricity: From a macroscopic point of view, the reasons are: friction between the objects to generate heat, triggering electron transfer; contact and separation between objects to produce electron transfer; electromagnetic induction causes imbalance of surface charge of the object; friction and electricity The combined effect of magnetic induction.
Microscopically, according to the theory of atomic physics, when electricity is neutral, the substance is in an electrical equilibrium state. Because of the gain and loss of electrons generated by the contact of different substances, the material loses its electrical balance and generates static electricity.
The electrostatic voltage is generated by the contact and separation of different kinds of substances. This effect is known as triboelectric charging, and the voltage generated depends on the nature of the material itself that rubs against each other. In the actual production process, the LED electronic display mainly generates static electricity by direct contact and indirect contact between the human body and related components. Therefore, according to the characteristics of the industry, we can do some targeted static precautions.
The harm of static electricity in the production process of LED electronic display:
If you ignore anti-static at any point in production, it will cause the electronic device to malfunction or even damage it.
When semiconductor devices are placed alone or loaded into a circuit, permanent damage to these devices may occur due to static electricity even if power is not applied. As we all know, LED is a semiconductor product. If the voltage between two pins or more pins of the LED exceeds the breakdown strength of the component medium, it will cause damage to the component. The thinner the oxide layer, the greater the sensitivity of the LED and driver IC to static electricity.
Another type of failure is caused by the temperature of the node exceeding the melting point of semiconductor silicon (1415 ° C). The pulse energy of static electricity can generate localized heat, so there is a direct breakdown of the lamp and the IC. This failure occurs even if the voltage is lower than the breakdown voltage of the medium. After the LED itself or the IC in the driver circuit is affected by static electricity, functional damage may not occur immediately. These potentially damaged components are usually displayed during use, so the life of the display is affected. It is fatal.
Therefore, in the process of daily operation, we must pay attention to the impact of static electricity on the LED electronic display.