There are many reasons for the loss of control of full-color LED display screens, among which the most important one is "LED failure".

    The main reasons for the failure of full-color LED displays can be divided into two aspects: First, the quality of the full-color LED display itself is poor; The second is improper usage methods. Based on this, we have summarized the corresponding relationship between the failure modes of full-color LED displays and the above two factors. Many of the faults of full-color LED displays mentioned above are often undetectable in the routine inspection and testing of full-color LED displays. Apart from improper uses such as electrostatic discharge, high current (causing excessively high junction temperature), and external forces, many failures of full-color LED displays occur in harsh environments like high and low temperatures, and rapid temperature changes. Due to the different thermal expansion coefficients of materials such as LED chips, epoxy resins, brackets, guide wires, die bonding adhesives, and PPA cup bodies, the internal stresses they cause also vary. Therefore, the quality inspection of full-color LED display screens is very complicated.

  In addition, for full-color LED displays, static discharge is the biggest cause of their failure. Due to the complex causes of full-color LED display screen failure, equipment, tools, utensils and the human body may all bring in static electricity and discharge it, and this static discharge only lasts for a few thousand volts, a few thousand volts and nanoseconds. The blue-green pipe faults that occur in the displays produced, installed and used by our company are often caused by the breakdown of the LED-PN junction due to electrostatic discharge.

  ISA has strictly regulated the standard electrostatic discharge modes, which are mainly divided into human body discharge mode (HBM) and mechanical discharge mode (MM). In China, electrostatic discharge sensitivity (ESDS) is classified into three levels for the human body: Level 1, 0 to 1999V; Class 2:2000-3999V Level 3: Above 4000V.

Generally, the sensitivity of full-color LED displays to electrostatic discharge is several hundred to tens of thousands of volts in human body mode, while it is only tens to 500 volts in machine mode. Due to the complex production process, the anti-static ability of full-color LED displays is relatively weak. Therefore, the static sensitivity of full-color LED displays should be selected at level 2 or higher (for human body type), and static protection must run through the entire production process.