What if the pixels of full-color LED display screen are out of control?

　　Generally, the common display screen pixels consist of 2R1G1B (2 red lights, 1 green light and 1 blue light, the same below) and 1R1G1B. The out of control generally does not mean that all the red, green and blue lights in the same pixel are out of control at the same time, but as long as one of the lights is out of control, we think that the pixel is out of control.

　　Therefore, it can be concluded that the main reason for the out of control pixel of full-color led display screen is the out of control LED lamp. The main causes of LED lamp failure can be divided into two aspects: first, LED's own quality is poor; Second, improper use methods.

　　LED failure cannot be found in the routine inspection and test of LED. Under harsh conditions such as high temperature, low temperature and rapid temperature change, due to the difference of thermal expansion coefficient of LED chips, epoxy resins, brackets, inner leads, solid crystal adhesives, PPA cups and other materials, the internal stress is different. The mechanism of LED failure caused by electrostatic discharge is very complex. Equipment, tools, utensils and human body may have static electricity and discharge it. This static electricity ranges from hundreds of volts to tens of thousands of volts, and the discharge time is at the nanosecond level.

　　If the blue-green tube fails, the LED-PN junction is often broken down by electrostatic discharge. Due to the complicated production process of LED display screen, electrostatic discharge cannot be prevented. Therefore, electrostatic protection must run through the whole production process.

　　In addition, under different circumstances, the actual requirements of pixel out of control rate are different, and the indicators of full-color LED display screen are required to be controlled within 1%; The indicators of monochrome LED display shall be controlled within one tenth. At present, there is no good solution for the pixels of full-color LED display screen. It is recommended to contact your service provider and return to the factory for repair. If the repair cost is too high, you can consider replacing the faulty module unit board.

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