In recent years, LED display production technology has gradually matured in our country, and the wide range and popularization of applications have become a trend. However, most of the LED display manufacturers currently do not have the true 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 the static electricity of the LED display? What harm does static electricity bring to the production of LED display?
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Causes of static electricity
From a microscopic point of view, according to the theory of atomic physics, matter is in a state of electrical equilibrium when it is electrically neutral, and the gains and losses of electrons generated by the contact of different matter electrons cause the matter to lose electrical balance and generate static electricity.
From a macro point of view, the reasons are: friction between objects generates heat, which stimulates electron transfer; contact and separation between objects produce electron transfer; electromagnetic induction causes an unbalanced distribution of charges on the surface of an object; 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 triboelectricity, and the voltage generated depends on the characteristics of the materials rubbing against each other. Because the LED display screen is mainly in the actual production process, the direct and indirect contact between the human body and related components generates static electricity. Therefore, according to the characteristics of the industry, some targeted electrostatic prevention measures can be taken.
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The harm of static electricity in the production process of LED display
If anti-static is neglected in any aspect of production, it will cause electronic equipment to malfunction or even damage it.
When semiconductor devices are placed alone or in a circuit, even if they are not powered on, static electricity may cause permanent damage to these devices. As we all know, LEDs are semiconductor products. If the voltage between two 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 LEDs and driver ICs to static electricity. For example, the lack of solder, the quality of the solder itself, etc., will cause serious leakage paths and cause devastating damage.
Another type of failure is caused when the temperature of the node exceeds the melting point of semiconductor silicon (1415 degree ). The pulse energy of static electricity can generate local heat generation, so there is a direct breakdown of the lamp and IC. This kind of failure occurs even if 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 cause the current gain to decrease sharply. After the LED itself or the ICs in the drive circuit are affected by static electricity, functional damage may not appear immediately. These potentially damaged components usually only appear during use, so the life of the display screen will be affected. Is fatal.
