Analyze the relationship between LED and static electricity
The PN junction inside the LED is applied to the manufacturing, assembly screening, testing, packaging, storage and transportation of the electronic product, and installation and use. It is inevitable that the induced charge will not be affected by the electrostatic induction.
If the charge is not released in time, a higher potential difference will be formed on the two electrodes. When the charge energy reaches the LED's tolerance limit (this is the LED antistatic index value), the charge will be released instantaneously.
Discharges between the two electrodes of the LED chip in a very short time (nanosecond level), and instantaneously will be between the two electrodes (where the resistance is the smallest, often around the electrode), the conductive layer, the light-emitting layer, etc. The internal material produces a local high temperature, and the temperature is as high as 1400 ° C. At this extreme high temperature, the material layer between the two electrodes is melted and melted into a small hole, thereby causing various abnormalities such as leakage, dead light and darkening.
The anti-static of LED chips of different enterprises, different processes, different substrate materials and different designs is also very different. The current anti-static height of the market is very different and the eyes are mixed.
The antistatic level of the LED is independent of the package of the LED, depending on the chip itself. Some companies use the Zener diode to protect it. This is a remedy adopted in the early days. Now, the LED chip process continues to improve, and this method is gradually becoming costly and operability is weak. Antistatic ability test below:
Once the enterprise encounters LED dead lights, such as dark leakage, the idea is often to strengthen the static management of their production workshop, such as grounding, laying static table mats, ion fans, etc., but this is not a cure, static is nowhere No, it can be said that 'hidden the first day can not hide fifteen'. Because the LED antistatic index used is low, it is difficult to cure a newborn with a health defect.
The company chooses LEDs (chips) with high anti-static index, which will completely solve the leakage accidents such as leakage and dead lights of LED caused by static electricity. Because of the high anti-static LED, it can adapt to various environments, such as LED anti-static. Above 2000V, it can generally withstand the static electricity in our ordinary environment. LEDs above 3000V can shine in the environment without deliberately strengthening the static control.
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