LED quality inspection is a very complicated operation. Again, with GaN-based LEDs, electrostatic discharge is the single biggest cause of failure. Electrostatic discharge LED failure caused by the mechanism is very complex, equipment, things, utensils and the human body can carry static electricity and its discharge, this kind of static electricity at the few hundred volts, high tens of thousands of volts, the discharge time in the nanosecond level . We produce in the display, installation, use the process of blue-green tube failure, often is the LED-PN junction was electrostatic discharge breakdown. World Electrostatic Society rules the rules of severe electrostatic discharge form, mainly divided into the human body discharge form (HBM) and machine discharge form (MM). Our country electrostatic discharge sensitivity of equipment (ESDS) is divided into three levels (human form): 1 for the 0 ~ 1999V; 2 for 2000 ~ 3999V; 3 for the 4000V above.
Under normal circumstances, the electrostatic discharge sensitivity LED in human form in the hundreds of volts ~ tens of thousands of volts, while in the form of machines as long as tens of volts to five hundred volts or so. LED display because of the production process is complicated, electrostatic discharge is very hard to detect, therefore, LED electrostatic discharge sensitivity should be selected 2 or more appropriate (human form), and electrostatic protection is necessary throughout the production process.