A lot of new contact LED display friends are curious, why in the visit to many LED display workshop, are required to bring shoe covers, electrostatic ring, wear electrostatic clothing and other protective equipment. To understand this problem, we have to mention the knowledge related to static electricity protection in the production and transportation of LED display. In fact, many LED displays appear dead or not bright, mostly due to static electricity.
Sources of static electricity in the production of LED displays:
1. Objects, materials.
2. Flooring, work tables and chairs.
3. Work clothes and packing containers.
4. Painted or waxed surfaces, organic and fiberglass materials.
5. Concrete floors, painted or waxed floors, plastic tiles or floor leather.
6. Chemical fiber work clothes, non-conductive work shoes, clean cotton work clothes.
7, Plastic, packaging boxes, boxes, bags, trays, foam liner.
If anti-static is neglected at any point in production, it will cause electronic devices to malfunction or even damage them. When semiconductor devices are placed individually or loaded into a circuit, even if they are not energized, permanent damage to these devices may occur due to static electricity. As you know well, LED is a semiconductor product, if the voltage between two or more pins of the LED exceeds the breakdown strength of the component dielectric, it will cause damage to the component. The thinner the oxide layer, the greater the sensitivity of the LED and driver IC to static electricity. For example, the lack of fullness of the solder, problems with the quality of the solder itself, etc., can create serious leakage paths that can cause devastating damage.
Another type of failure is caused when the temperature of the node exceeds the melting point of semiconductor silicon (1415°C). The pulsed energy of static electricity can produce localized local heating, so that a fault occurs that directly penetrates the lamp and the IC. This failure can occur even if the voltage is below the breakdown voltage of the dielectric. A typical example is that the LED is a PN junction composition of the diode, the emitter and base of the breakdown between the current gain will be sharply reduced. LED itself or the driver circuit in the various in the IC by the impact of static electricity, may not immediately appear functional damage, these potentially damaging components are usually in the use of the process will only be shown, so the impact of the life of the LED product are fatal.
LED display production process is a very rigorous, subtle process, each link can not be omitted. Display of electrostatic protection is also an important part of the production of LED display, the industry is still not deep enough to understand the electrostatic protection, much less to meet the needs of professional LED display production, but also need more professionals to continue to study and discuss together.
How to prevent static electricity in the production of LED display:
1. The use of electrostatic sensitive circuit personnel to carry out electrostatic knowledge and related technology training.
2. The establishment of anti-static work area, the use of static discharge floor, anti-static workbench, anti-static grounding leads and anti-static appliances, and will go to the relative humidity control in more than 40.
3. The hazards posed by static electricity to electronic equipment can be released anywhere from the manufacturer to the equipment in the field. Hazards are caused by inadequate, effective training and equipment manipulation failures.LEDs are static-sensitive devices.INGAN wafers are usually considered "first" in terms of susceptibility to interference. INGAN chips are generally considered "first" in terms of susceptibility, while ALINGAPLEDSSHI is "second" or better.
4. ESD damaged devices can show dim, fuzzy, off, short or low VF or VR. ESD damaged devices should not be confused with electronic overloads, such as: due to faulty current design or drive, wafer hookup, wire shield grounding or encapsulation, or common environmental induced stress.
5. ESD safety and control procedures: most electronic and electro-optical companies are very similar to the ESD, and has successfully implemented so the equipment of ESD control, manipulation and master program. These programs have been used since the ancient times to detect the quality effects of ESD instruments. ISO-9000 certification also includes him in the normal control procedures.
Post time: Jul-17-2023