What is the cause of static electricity on LED screens? What hazards does static electricity bring to LED display screen production? In recent years, the production technology of LED display screens has gradually matured in China, and the widespread application and popularization have become a trend. But currently, most LED display screen manufacturers do not fully possess the true ability to produce modified products, which has brought hidden dangers to LED electronic displays and even affected the entire market.
Causes of static electricity generation:
From a microscopic perspective, according to the theory of atomic physics, when a substance is electrically neutral, it is in an equilibrium state. Due to the gain or loss of electrons generated by the contact of different substances’ electrons, the substance loses its electrical balance and generates electrostatic phenomena.
From a macro perspective, the reasons are: friction between objects generates heat, which stimulates electron transfer; Contact and separation between objects generate electron transfer; Electromagnetic induction causes uneven 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 types of substances. This effect is known as frictional electrification, and the voltage generated depends on the characteristics of the materials that are rubbing against each other. Due to the fact that LED display screens mainly generate static electricity through direct and indirect contact between the human body and related components in the actual production process. So based on the characteristics of this industry, we can take some targeted electrostatic prevention measures.
The harm of static electricity in the production process of LED display screens
If anti-static measures are ignored at any stage of production, it will cause electronic equipment malfunction or even damage.
When semiconductor devices are placed separately or installed in circuits, even without power, static electricity may cause permanent damage to these devices. As we all know, LED is a semiconductor product. If the voltage between two or more pins of 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 driving ICs to static electricity. For example, insufficient solder, quality issues with solder itself, and so on, can lead to serious leakage paths and cause destructive damage.
Another type of fault is caused by the temperature of the node exceeding the melting point of semiconductor silicon (1415 ℃). The pulse energy of static electricity can generate local heating, resulting in direct breakdown of the lamp tube and IC. Even if the voltage is lower than the breakdown voltage of the medium, this fault can occur. A typical example is that an LED is a diode composed of a PN junction, and the breakdown between the emitter and base will cause a sharp decrease in current gain. After the LED itself or various ICs in the driver circuit are affected by static electricity, functional damage may not occur immediately. These potentially damaged components are usually manifested during use, so the impact on the lifespan of the display screen is fatal.
Therefore, during the installation and use of LED display screens, sufficient attention should be paid to changes in environmental humidity and temperature, and the idea of prevention first, strengthened management, and strict inspection should be adhered to to to ensure the normal use of LED display screens.