Many friends who have just touched the led display are curious as to why they are required to wear protective covers such as shoe covers, electrostatic rings and static clothes when visiting many LED display workshops. To understand this problem, it is necessary to mention the knowledge related to electrostatic protection in the production and transportation of led display screens - many led displays have dead lights or no lights, mostly due to static electricity.
The source of static electricity during the production of led display
1, objects, materials
2, floor, work desks and chairs
3, overalls, 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 overalls, non-conductive work shoes, clean cotton overalls.
7, plastic, box, box, bag, plate, foam pad.
The harm of static electricity in the production process of led display If it ignores anti-static at any stage of production, it will cause the electronic equipment to malfunction or even damage it. When semiconductor devices are placed alone or loaded into a circuit, permanent damage to these devices may occur due to static electricity even if power is not applied. As we all know, led is a semiconductor product. If the voltage between two pins 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 the LED and the driving ic to static electricity. For example, the solder is not full, the quality of the solder itself is problematic, etc., and a serious leakage path is generated, thereby causing devastating damage.
Another type of failure is caused by the temperature of the node exceeding the melting point of semiconductor silicon (1415 ° C). The electrostatic pulse energy can generate localized heating, so there is a direct breakdown of the lamp and ic. This failure occurs even if the voltage is lower than the breakdown voltage of the medium. A typical example is that LED is a diode composed of a pn junction, and the breakdown between the emitter and the base causes a sharp drop in current gain. After the LED itself or the driving circuit is affected by static electricity, functional damage may not occur immediately. These potentially damaged components are usually displayed during use, so the life effects of the LED products are affected. It is fatal.
The production process of the led display is a very rigorous and subtle process, and every link must not be overlooked. The static electricity protection of the display screen is also an important part of the LED display production. At present, people in the industry are not deeply aware of the electrostatic protection, and can not meet the needs of professional LED display production. More professionals are needed to continuously research and share discuss.
How to prevent static electricity in the production of small pitch led display:
1) Training of static electricity knowledge and related technologies for personnel using static sensitive circuits.
2) Establish an anti-static work area, use static-discharge floor, anti-static workbench, anti-static grounding lead and anti-static device in the area, and control the relative humidity to 40 or above.
3) 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, effective training and malfunction of equipment handling. Led is a device that is sensitive to static electricity. Ingan wafers are generally considered to be "first" susceptible to interference. And alingapledsshi "second place" or better.
4) Esd damaged device can show dim, blur, extinction, short or low vf or vr. Esd damaged equipment should not be confused with electronic overload, such as: faulty current design or drive, wafer hooking, wire shield grounding or packaging, or common environmental induced pressure.
5) esd security and control procedures: Most electronic and electro-optical companies have very similar esd and have successfully implemented the esd control, manipulation and main program of the device. These programs have been used to detect quality effects because of esd. The iso-9000 certification also included him in the normal control program.
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