About the static safeguard procedures in LED display screen production process
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In recent years, LED display screen production technology is ripe gradually in China, the application is extensive and popularizes becoming the trend. But most real capability for producing this kind of product of manufacturer’s still not complete possession of LED display screen at present, thus has brought the hidden danger to LED display screen products, so that influence the whole market. How to normalize production, how to produce the real low LED display screen products that decay, long-lasting This text only discusses the danger that static of this course brings and protects the method in terms of static protection of LED display screen production process.
Reason why the static produces
From microcosmic, according to the physical theory of atom, the material is in electric balance state when the electricity is neutral, the electronic gain and loss that arise from different electronic contact of material, make the material lose the electric balance, produce the static phenomenon.
Speaking from the macroscopic, the reason is as follows, rub the generation of heat among the objects, stimulate electron transport; Contact and separation among the objects produced electron transport; The ones that cause electric surface charge of object in electromagnetic induction no equilibrium distribution; Rub and electromagnetic induced comprehensive effect.
The electrostatic voltage is emerging by different types of materials are kept in touch and separated each other. This kind of effect is triboel ectrification that everybody knows very well, the characteristic that the voltage produced depends on the mutual tribological material. Because mainly the human body and relevant direct contact and indirect contact of components and parts produced the static in LED display screen is in the real production process. So we can do some pertinence static precautionary measures according to the characteristic of this trade.
Danger while LED display screen produces of static
If is producing and ignoring anti-electrostatically on any link, it will cause the electronic device not to work even make it damage.
When the semiconductor device is put or packed into the circuit alone, even there is no power up, because the static may cause the irremediable defect of these devices. Everybody knows very well, LED is the semi-conductive products, if the voltage between two stitches or more stitches of LED exceeds the breakdown strength of the component medium, will cause damage to the component. The thinner the oxide layer is, then LED and drives IC the bigger to static sensibility, for example flux is not energetic, own quality existing problem of flux,etc., will all produce the severe leakage path, thus cause crushing destruction.
Another trouble because nodal temperature exceed semi-conductive fusing point of silicon ‘ 1415 ) Cause hour. Static pulse energy can produce some place and generate heat, so the trouble of puncturing modulator tube and IC directly. Even if the voltage is lower than the spark-over voltage of the medium, this kind of trouble will take place. A typical example is, LED is a constituent diode of PN junction, emitter and group interpolar puncture will make current gain reduce sharply. LED, or every in the driving circuit hit IC, influence by static, may not present functional damage immediately either, these receive potential spoiled component will show in the course of using usually, so impacts on life-span of the display screen are all fatal.
About the static safeguard procedures in LED display screen production process
First, earth
It is to discharge the static to the earth to earth through the wire coupling, it is the most direct and most valid while arranging that this is anti-electrostatic, as to the thing that conductor use earthy method usually, we tool used manually to demand earth and tape earth anti-electrostatic hand-ring and table top earth etc..
( 1) In process of production, require workers to wear and earth the static hand-ring. Especially at pin-cutting, card, debugging and after weld by process at,and it is monitor to finish, quality personnel must make a hand-ring static test the least every two hours, finish test to note down.
( 2) During welding, the electric iron should adopt the thermostatical flatiron of anti-electrostatic undervoltage as much as possible, and keep the good earthing.
( 3) In equipment, use the undervoltage direct current with earth lead to move the opener (commonly called as the electricity to criticize) as much as possible .
( 4) Guarantee to produce and draw the platform, irritate the adhesive tape dispenser, aging shelf etc. to earth effectively.
( 5) We require the production environment to make sure to lay the copper wire to earth, such as floor, wall, and ceiling,etc. where some occasions used, should all use the anti-electrostatic material. Usually, even ordinary gypsum plate and lime coating wall are all right, but forbid using plastic products ceiling and ordinary wall paper or plastic wall paper.
The burying underground of second, anti-electrostatic ground wire:
(1) The lightning arrester of the BLDG of factory building is generally welded with the BLDG iron concrete together and earthed properly, when striking by lightning and happening, the ground of touch-down point and even the whole building will become discharging some of electric current of high pressure. It is generally acknowledged have in discharging the touch-down point 20M range ” Step forward voltage ” Produce, namely no longer ideal zero potential in this range. In addition, the zero line of the three phase supply will have unbalance current to emerge and flow into a collinear touch-down point too because of can not absolutely equilibrate ing, to bury, it sets up an office to be should from BLDG and the intersection of apparatus and 20 of place anti-electrostatic ground wire.
(2) Bury the method underground: For guarantee earthy and reliable, cause, lack, should have three the intersection of point and the above earth, namely dig the intersection of 1.5m and dark hole the above through 5m while being every, throw into above 2m iron pipe or angle iron in the hole (angle iron is inserted in underground above 2m) ,Reuse 3mm thick copper gang to weld these three places together, it is a trunk line to burn on and introduce into the indoor with 16m2 insulating copper core wire.
(3) Construct it with right amount of charcoal powder and industry salt in the hole, in order to increase the soil conductivity, measure with the ground resistance test set after landfill, the earthing resistance should be smaller than 4, and test once at least every year.
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