In the autumn and winter seasons, the weather is getting dry day by day, which is the season when static electricity is most likely to occur. In a dry environment, static electricity on the human body can usually reach several thousand volts or even tens of thousands of volts. Although electrostatic discharge (ESD) does not cause life danger to the human body, it can easily cause fatal damage to semiconductor products such as LED displays.
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The hazards of electrostatic discharge (ESD)
ESD (Electrostatic Discharge) often occurs at any link in the process of LED display production, transportation, installation, etc. Due to the irregular operation, the product is broken down by static electricity, causing sudden damage and potential damage to the LED display product.
Sudden damage reduces product yield and increases enterprise costs. Sudden damage refers to the fact that the voltage between two or more pins of the LED product component exceeds the breakdown strength of the component medium, causing the component to be severely damaged and lose its function. This kind of damage can usually be found in the quality inspection during the production process and will not directly affect the customer's use. However, if the manufacturer is subject to static electricity for a long time, it will increase the production cost.
Potential damage affects the service life of the product and causes losses to customers. Potential damage accounts for a higher proportion of electrostatic discharge (ESD) damage, reaching more than 90 percent , and because the pulse energy of static electricity causes local heating of the lamp or IC, the breakdown of the lamp and IC is being detected. Can not be found. However, the product became unstable, and the phenomenon of dead lights appeared one after another in the subsequent use of customers, which greatly affected the service life of the LED display and caused losses to customers.
Electrostatic discharge (ESD) prevention
To minimize the damage of static electricity to LED displays, manufacturers, distributors and customers must strictly implement the ESD20.20 standard during production, transportation and use. In production, the static electricity is directly discharged to the ground through the wire connection, which is the most direct and effective anti-static measure.
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Prevention of static electricity at the production side: Conduct training on static electricity knowledge and related techniques for personnel who use static sensitive circuits.
In the production process, workers are required to wear a grounded electrostatic wristband. Especially during the cutting, plug-in, debugging, and post-welding processes, and for monitoring, the quality personnel must do a bracelet static test at least every two hours and make a test record.
When soldering, the electric soldering iron should use anti-static low-voltage constant temperature soldering iron as much as possible, and keep good grounding. In the assembly process, use a low-voltage DC electric screwdriver (commonly known as electric screwdriver) with a ground wire as much as possible. Ensure the effective grounding of the production pull table, glue potting table, and aging rack. The production environment is required to be grounded with copper wires, such as floors, walls, and ceilings used in some occasions, all of which should use anti-static materials. In daily operation, LED display products should always be stored in anti-static bags or containers.
Static electricity prevention on the transportation side: During transportation, the transportation vehicle should be grounded, and the box or other equipment has conductive wheels or drag links. When touching LED products, keep the correct method of handling and do not directly touch the PCB board and the electronic components on it.
Client-side static prevention: When installing the screen, customers and engineering companies must also strictly follow the anti-static operation, and do not directly touch the core electronic components of the product without protective measures. When installing the steel structure of the screen body, make effective grounding and lead the screen body static electricity to the ground.
