What should I do if the LED display pixel is out of control?

　　Pixel out of control rate refers to the percentage of the smallest imaging unit (pixel) of the display screen that does not work properly (out of control).

　　The ratio of out of control pixels to the total number of full screen pixels is called "out of control rate of full screen pixels". In addition, in order to avoid out of control pixels concentrated in a certain area, we propose "out of control rate of regional pixels", that is, at 100 × The ratio of the number of out of control pixels to the total number of regional pixels (i.e. 10000) in a 100 pixel region. This index quantifies the requirement of "uncontrolled pixels are distributed in discrete form" in General Specification for LED Displays SJ/T11141-2003, which is convenient and intuitive.

　　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 coefficients of LED chips, epoxy resins, brackets, inner leads, solid crystal adhesives, PPA cups and other materials, their internal stresses are 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.

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