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In recent years, the production technology of LED screen has gradually matured in my country, and the application field has become a trend. However, at present, most LED screen manufacturers do not fully have the real ability to produce such products, which brings hidden dangers to LED screen products and even affects the entire market. Static electricity is one of them. So, what is the cause of static electricity in the LED screen? What harm does static electricity bring to LED screen production? This article will explain it in detail for you.
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 screen, the direct and indirect contact between the human body and related components generates static electricity. Therefore, according to the characteristics of this industry, some targeted electrostatic preventive measures can be taken.
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 each IC in the drive circuit is affected by static electricity, functional damage may not occur immediately. These potentially damaged components usually only manifest during use, so the impact on the life of the display is fatal.
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