In most cases, what customers care most about the performance parameters of LED display products is the display and performance parameters, such as the color, brightness, chip, power supply, refresh and other issues of the LED display. Few people pay attention to the LED display. The knowledge of screen static electricity, in fact, the impact of static electricity in electronic products such as LED display screens is still great, and sometimes it can be fatal, so it is still necessary to understand.
The LED display screen body will have static electricity during the production process. The occurrence of static electricity will cause harm to the production link of the LED display. Therefore, in order to avoid hidden hazards, LED display manufacturers must understand the source of static electricity and take precautions. If it doesn't happen, respond promptly after it appears.
Indoor led display
Here we first introduce the source of static electricity on the led display:
The sources of static electricity that affect the circuit are mainly the human body, plastic products and related equipment and instruments. The static electricity from the environment of use includes objects and materials; floors, work tables and chairs; work clothes, packaging containers; painted or waxed surfaces, organic and Glass fiber materials; cement floors, painted or waxed floors, plastic floor tiles or floor leather; chemical fiber work clothes, non-conductive work shoes, clean cotton work clothes; plastics, boxes, boxes, bags, plates, foam pads.
The source of static electricity for led display screens can be generated in many details during the production process, such as: objects, materials, floors, work tables and chairs, work clothes, packaging containers, painted or waxed surfaces, organic and glass fiber materials, cement floors, paints Or waxed floors, plastic floor tiles or floor leather, chemical fiber work clothes, non-conductive work shoes, clean cotton work clothes, plastic, packing boxes, boxes, bags, trays, foam pads.
Electrostatic discharge failure: sudden failure and potential failure. In the use environment, the electrostatic failure of 90 or more is a potential failure, which is manifested as the weakening of the circuit's anti-electric overstress ability and the shortening of the service life.
The harm caused by static electricity in the LED display production process:
Ignoring anti-static in any link of led display production will cause electronic equipment to malfunction or even damage it. When semiconductor devices are placed alone or in a circuit, even if they are not powered on, static electricity may cause permanent damage to these devices. As we all know, LEDs are semiconductor products. If the voltage between two or more pins of the 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 driver ICs to static electricity. For example, the lack of solder, the quality of the solder itself, etc., will cause serious leakage paths and cause devastating damage.
Another type of failure is caused when the temperature of the node exceeds the melting point of semiconductor silicon (1415 degree ). The pulse energy of static electricity can generate local heat generation, so there is a direct breakdown of the lamp and IC. This kind of failure occurs even if the voltage is lower than the breakdown voltage of the medium. 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 occur immediately. These potentially damaged components usually show up during use, so the life of the LED product will be affected. Is fatal.
Anti-static measures: conduct training on electrostatic knowledge and related technologies for personnel who use electrostatic sensitive circuits; establish an anti-static work area, use anti-static floor, anti-static workbench, anti-static grounding lead and anti-static appliances in the area, and install The relative humidity should be controlled above 40; the damage caused by static electricity to electronic equipment may be released anywhere from the manufacturer to the field equipment. The hazard is caused by insufficient and effective training and malfunction of equipment. LED is a device sensitive to static electricity. INGAN chips are generally considered to be the "first" susceptible to interference. And ALINGAPLEDSSHI "second place" or better; ESD damaged equipment can show dim, fuzzy, extinguished, short or low VF or VR. ESD damaged equipment should not be confused with electronic overload, such as: incorrect current design or drive, chip mounting, wire shielding grounding or packaging, or ordinary environmental induced pressure, etc.; ESD safety and control procedures: most The ESD of electronic and electro-optical companies is very similar, and has successfully implemented the ESD control, manipulation and main program of all equipment. These procedures have been used as instruments for testing quality effects because of ESD ancient times. ISO-9000 certification also lists him as a normal control procedure.
Transportation and packaging: In daily operations, ESD sensitive equipment should always be stored in anti-static bags or containers. This includes inventory storage, shipping and WIP. Precautions during transportation include consumable fleets, boxes or other equipment, such as conductive wheels or drag links, and grounding the ESD equipment when transporting; LED displays are currently the most widely used display products for large screens on the market, because It is a high-end display product, and the production cost is relatively high. LED display manufacturers need to train their employees on anti-static knowledge, and at the same time control the relative humidity above 40, to minimize the damage rate of the LED display during transportation.
The LED display screen production process is a very rigorous and subtle process, and every link must not be overlooked. The electrostatic protection of display screens is also an important part of the production of LED display screens. At present, people in the industry do not have a deep enough understanding of electrostatic protection, let alone meet the needs of professional LED electronic display production. More professionals need to continue to study, Discuss together. Mastering the anti-static knowledge of LED display screens can help improve the production efficiency of LED display screen products, and also reduce the occurrence of safety accidents.
