LED display how to avoid electrostatic method - in use LED display - knowledge

by:Xinyao LCD     2020-04-25
Display in daily work often need to deal with customers to use all kinds of problems appeared in the process of LED display. There are some problem is easy to be ignored, the results are often time-consuming. Today just to say to you a LED display easily neglected problems, static electricity. Attaches great importance to anti-static measures, the following is for electrostatic and anti-static several description: LED display the causes of static electricity: from microscopic, according to the theory of atomic physics, electrical neutral substance in the electrical balance state, due to the different material of electronic contact the gain and loss, the balance of material lost electricity, produce electrostatic phenomena. Reasons: objects between the friction heat production, stimulate the electron transfer; Objects of the contact and separation between electron transfer; Electromagnetic induction cause unbalanced distribution of surface charge; The friction and the synthetical effects of the electromagnetic induction. Electrostatic voltage is made up of different kinds of material and touch each other and separation. This effect is known as triboelectrification, generated by the voltage depends on the mutual friction characteristics of the material itself. Due to the LED display in the actual production process mainly is the human body and the related components of direct contact and indirect contact with static electricity. So according to the characteristics of the industry, we can do some corresponding measures to prevent static electricity. The main source of electrostatic affect circuit are human body, plastic products and related equipment instrument, including static power from using the environment has the following several: objects, materials, work tables and chairs overalls, packaging container floor wax paint or surface, organic and glass fiber materials. Cement floor paint or waxing floor, plastic floor tile or plastic flooring. Chemical fiber clothes, not conductive work shoes, clean cotton overalls. Plastic, packing box, box, bag, disc, foam padding. Static discharge failure of sudden failure and potential failure. Static electricity failure in using the environment above 90 for the potential failure, show the circuit resistance electric stress ability weakened, shorten service life. How to avoid static LED display? A, grounding, grounding is directly to the electrostatic discharge via wire connection on the earth, this is the most direct the most effective in anti-static measures, for usually use the method of grounding conductors, we require artificial using the tools of grounding, grounding anti-static hand ring, and working mesa grounding, etc. ( 1) In the process of production, requirement worker must wear grounding electrostatic bracelet. Especially in the feet, plug-in, after debugging and welding process, and inspection, quality personnel must be at least once every two hours to do the bracelet static test, test record. ( 2) When welding, soldering iron should be used as antistatic low constant temperature soldering iron, and maintain a good grounding resistance. ( 3) In the process of assembly, as far as possible, use the low voltage dc electric screwdriver with ground wire ( Commonly known as electric group) 。 ( 4) Ensure the production machine, glue machine, aging aircraft effective grounding, etc. ( 5) We require a production environment do laying copper grounding, such as floors, walls, ceiling, etc. , and some situations should be anti-static materials used. Often, even ordinary gypsum and lime paint metope can, but it is prohibited to use plastic ceiling and ordinary wall paper or plastic wallpaper. Second, anti-static ground wire embedding: ( 1) Factory building lightning rod reinforced concrete building and the general welding together properly grounded, when lightning occurs, the ground of the ground and the whole building will be high voltage heavy current discharge points. It is generally believed in the discharge ground within the scope of 20 m will be 'step, namely in the range is no longer the ideal zero potential. In addition, the zero line of three-phase power supply due to could not have absolute balance will have the unbalance current produced and into the zero line of the ground, so the anti-static ground wire embedding point should be 20 metres away from buildings and equipment. ( 2) Embedding method: in order to ensure the reliable grounding, less due to three points above ground, namely every 5 m 1. More than 5 m deep pit, will be more than 2 m iron pipe or Angle into the pit, The Angle iron inserted into the underground for more than 2 m) , again with a 3 mm thick copper platoon this three welded together, with 16 m2 introduces indoor for main line on the insulated copper wire welding. ( 3) Pit with a moderate amount of charcoal powder and industrial salt, in order to increase the soil electrical conductivity, the landfill after measured with grounding resistance tester, grounding resistance should be less than 4 Ω, and tested at least once a year.
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