In recent years, LED display technology in China is becoming increasingly mature, widely used and popular in the field of the trend. However, at present, most LED display manufacturers are not fully capable of producing such products, which brings hidden dangers to LED display products and even affects the whole market. Static electricity is one of them. So, what is the cause of LED display static electricity? What harm does static electricity bring to LED display screen production? This article will explain in detail.
1. Causes of static electricity
From the micro point of view, according to the theory of atomic physics, when the material is in an electrical equilibrium state, due to the gain and loss of electrons generated by the contact of different materials, the material loses its electrical balance and produces electrostatic phenomenon.
From the macro point of view, the reasons are: friction between objects heat, stimulate electron transfer; Contact and separation between objects results in electron transfer; The unbalanced distribution of surface charge is caused by electromagnetic induction. The combined effects of friction and electromagnetic induction.
Electrostatic voltage is produced by the contact and separation of different kinds of substances. This effect is known as triboelectrification, and the resulting voltage depends on the properties of the material itself. Because LED display screen in the actual production process is mainly the human body and related components of direct contact and indirect contact to generate static electricity. So according to the characteristics of the industry can do some targeted static prevention measures.
2. Harm of static electricity in the production process of LED display screen
If antistatic is neglected in any process of production, it will cause failure or even damage of electronic equipment.
When semiconductor devices are placed alone or loaded into a circuit, static electricity may cause permanent damage to these devices, even if they are not charged. 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 element medium, the element will be damaged. The thinner the oxide layer, the greater the sensitivity of LED and drive IC to static electricity, such as insufficient solder, solder itself quality problems, etc., will produce serious leakage path, resulting in devastating damage.
Another fault is caused when the temperature of the node exceeds the melting point of the semiconductor silicon (1415℃). Electrostatic pulse energy can generate local heat, so direct breakdown of the lamp and IC failure. This fault occurs even when the voltage is lower than the breakdown voltage of the medium. A typical example is that leds are diodes made up of PN junctions, where a breakdown between the emitter and the base causes a sharp decrease in current gain. LED itself or each IC in the drive circuit may not be immediately damaged by static electricity. These potentially damaged components are usually shown in the process of use, so the impact on the life of the display screen is fatal.