Talking about the effect of static electricity on LED display
Static electricity is actually a kind of voltage, which is produced by the contact and separation of different kinds of substances. This is the well-known frictional electrification, because the voltage generated is not large, so we usually do not have the feeling of electric shock. But for the LED production industry, the impact is very large. What effect does static electricity have on the LED display?
Because the LED large screen in the actual production process is mainly the direct contact and indirect contact between the human body and related components to generate static electricity. Therefore, according to the characteristics of the industry, we can do some targeted static precautions.
When semiconductor devices are placed alone or loaded into a circuit, permanent damage to these devices may occur due to static electricity even if power is not applied. LEDs are semiconductor products that can damage components if the voltage between the two pins or more of the LEDs exceeds the breakdown strength of the component media. The thinner the oxide layer, the greater the sensitivity of the LED and the driving ic to static electricity. For example, the solder is not full, the quality of the solder itself is problematic, etc., and a serious leak path will occur, causing devastating damage! Another type of failure is caused by the temperature of the node exceeding the melting point of semiconductor silicon (1415 ° C).
Electrostatic pulse energy can generate localized heat, so there is a direct breakdown of the lamp and ic. This failure occurs even if the voltage is lower than the breakdown voltage of the medium. A typical example is that LED is a diode composed of a pn junction, and the breakdown between the emitter and the base causes a sharp drop in current gain. After the LED itself or the ic in the driver circuit is affected by static electricity, functional damage may not occur immediately. These potentially damaged components are usually displayed during use, so the lifetime of the LED large screen is affected. It is fatal.