Many friends who are new to outdoor LED displays are curious as to why, when visiting many outdoor LED display workshops, they are required to bring protective equipment such as shoe covers, electrostatic rings, and electrostatic clothes. To understand this problem, it is necessary to mention the knowledge about electrostatic protection in the production and transportation of LED display screens; many LED display screens have dead lights or do not light, most of which are caused by static electricity.
Sources of static electricity during Omaha LED display production
1.Objects and materials
2. Floors, work tables and chairs
3.Work clothes and packaging containers;
4. Painted or waxed surfaces, organic and fiberglass materials.
5. Cement floor, painted or waxed floor, plastic floor tile or floor leather.
6, chemical fiber work clothes, non-conductive work shoes, clean cotton work clothes.
7, plastic, box, box, bag, plate, foam plastic liner.
Hazard of static electricity in the production process of LED display. If anti-static is neglected at any stage of production, it will cause electronic equipment to malfunction or even damage it. When semiconductor devices are placed alone or incorporated into a circuit, they can be permanently damaged due to static electricity, even if they are not powered. As everyone knows, LEDs are semiconductor products. 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, there is a problem with the quality of the solder itself, etc., there will be serious leakage paths, which will cause devastating damage.
Another failure is caused when the temperature of the node exceeds the melting point (1415 ° C) of the semiconductor silicon. The pulsed energy of static electricity can generate local heating, so there is a failure to directly break down the lamp and IC. This failure can occur even if the voltage is below the dielectric breakdown voltage. 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 driving circuit are affected by static electricity, functional damage may not immediately occur. These potentially damaged components usually show up during use, so the impact on the life of LED products is Is deadly.
The production process of Omaha LED display is a very rigorous and delicate process, and every link must not be overlooked. The electrostatic protection work of the display is also an important part of the production of LED displays. At present, the industry's understanding of electrostatic protection is not deep enough, and it cannot meet the needs of professional LED display production. discuss.
How to prevent static electricity in Omaha LED display production:
(1) Train static electricity knowledge and related technologies for personnel using electrostatic sensitive circuits.
(2) Establish an anti-static work area, use an anti-static floor, an anti-static workbench, an anti-static grounding lead, and an anti-static appliance in this area, and control the relative humidity above 40.
(3) The harm caused by static electricity to electronic equipment may be released anywhere from the manufacturer to the field equipment. Hazards are caused by inadequate, effective training and malfunctioning equipment operations. LEDs are static-sensitive devices. INGAN chips are generally considered to be 'first place' susceptible to interference. And ALINGAPLEDSSHI 'second place' or better.
(4) Devices with ESD damage can show dim, blurry, extinguished, short or low VF or VR. ESD damaged equipment should not be confused with electronic overload, such as: due to incorrect current design or drive, chip mounting, wire shield grounding or packaging, or ordinary environmentally induced stress.
(5) ESD safety and control procedures: The ESD of most electronic and electro-optical companies is very similar, and has successfully implemented the ESD control, manipulation and main procedures of all equipment. These procedures have been used since ancient times for instruments that detect quality effects. ISO-9000 certification also includes him in normal control procedures.