LED packaging companies and manufacturers of LED lighting will encounter LED the dead lights phenomenon, as the LED engineers how to analyze and solve these problems?
The LED dead lights mainly due the following two points:
1) the leakage current of the LED is too large to cause PN junction failure, not bright LED light points, this generally does not affect the work of other LED lights
2) LED lights internal connection lead off, causing the LED current through a dead lights, this case will affect the normal work of the other LED lights
How prevention LED die lights?
Static LED lights are a danger to the great devil, the world countless electrostatic damage to electronic components, resulting in tens of millions of dollars in economic losses. So to prevent electrostatic damage to electronic components, the electronics industry is a very important work, the LED package and application companies do not take it lightly. Any aspect of the problem, will cause damage to the LED, the LED performance deterioration or even failure. We know that the human body (ESD) Static electricity can reach about three kV enough to breakdown damage to the LED chip, LED packaging production line, the compliance with the requirements of the various types of equipment grounding resistance, which is very important, general requirements for grounding resistance Ohm, some require high occasions grounding resistance even to achieve ≤ 2 ohms.
Human body electrostatic damage to the LED is a big, the electrostatic ring antistatic work should wear anti-static clothing, equipped with a wrist strap, a wrist strap should be well grounded, there is a need to ground effect is not good, do not recommend the use of wear the product, if the staff mishandling, you should accept the warning education, also notices the others. How much of the body with static electricity, and people wearing clothes of different fabrics, and human physique, autumn and winter night we undress it is easy to see the clothes between the discharge phenomenon, there are three such electrostatic discharge voltage kV.
Some companies hand soldering, the use of 40-watt ordinary soldering iron, soldering temperature can not control the temperature of the iron in the 300-400 ℃, excessive soldering temperature can also cause death lights the LED lead in the high temperature expansion coefficient than about 150 ℃ several times higher coefficient of expansion, internal gold wire solder welding points opened because of excessive expansion and contraction caused by the phenomenon of dead lights.
In response to these phenomena, LED packaging manufacturers and LED lighting applications manufacturers should develop a strict standard of LED user manual to put an end to the on-line phenomenon occurred in the production process.