time：2022-03-17 source：ZJ Lighting Views：163
In recent years, LED display production technology has gradually matured in our country, and the application field is widely and popularized as a trend. However, at present, most LED display manufacturers do not fully have the real ability to produce such products, which brings hidden dangers to LED display products and even affects the entire market. Static electricity is one of them. So, what is the cause of static electricity in the led display? Why does static electricity harm the led display? This article will explain it in detail for you.
1. Causes of static electricity
From a microscopic perspective, according to the theory of atomic physics, a substance is in a state of electrical equilibrium when it is electrically neutral. Due to the gain and loss of electrons generated by the contact of electrons in different substances, the substance loses its electrical balance and produces static electricity.
Macroscopically, the reasons are as follows: friction between objects generates heat and stimulates electron transfer; contact and separation between objects produce electron transfer; electromagnetic induction causes unbalanced distribution of surface charges on objects; the combined effect of friction and electromagnetic induction.
Electrostatic voltage is generated by the contact and separation of different kinds of substances. This effect is known as triboelectric electrification, and the resulting voltage depends on the properties of the materials that are rubbing against each other. In the actual production process of the led display screen, static electricity is mainly generated by the direct and indirect contact between the human body and related components. Therefore, according to the characteristics of this industry, some targeted electrostatic preventive measures can be taken.
2. The harm of static electricity in the production process of led display
If anti-static is ignored in any part of production, it will cause the electronic equipment to malfunction or even damage it.
When semiconductor devices are placed alone or incorporated into circuits, static electricity can cause permanent damage to these devices, even if they are not powered. It is well known that LEDs are semiconductor products, and if the voltage between two or more pins of the LED exceeds the breakdown strength of the element's dielectric, it will cause damage to the element. The thinner the oxide layer, the greater the sensitivity of the LED and the driver IC to static electricity. For example, the solder is not full, the quality of the solder itself has problems, etc., which will cause serious leakage paths, resulting in devastating damage.
Another failure is caused when the temperature of the node exceeds the melting point of semiconductor silicon (1415°C). The pulse energy of static electricity can generate local heat, so there is a failure to directly break down the lamp and IC. This failure occurs even when the voltage is lower than the breakdown voltage of the medium. A typical example is that the LED is a diode composed of a PN junction, and the breakdown between the emitter and the base will drastically reduce the current gain. After the LED itself or the ICs in the driving circuit are affected by static electricity, functional damage may not occur immediately. These potentially damaged components usually only show during use, so it will affect the life of the LED display. are fatal.