What to do if the pixels of full color LED display are out of control

The display shows that some of the images are not bright, or the bright areas are not bright, the bright areas are still bright, yes, yes, these can be caused by the pixels of the full color LED display being out of control, then the reason What is it, and how can it be solved?

In general, common display pixel components are 2R1G1B (2 red lights, 1 green light, and 1 blue light, the same applies below) and 1R1G1B, and out of control will not usually be red, green, and blue in the same pixel. The lights are all out of control at the same time, but as long as one of the lights is out of control, we consider that the pixel is out of control.

Therefore, it can be concluded that the main cause of the out-of-control pixels of full-color LED display screens is the out-of-control LED lights. The main reasons for the failure of LED lights can be divided into two aspects: one is the poor quality of the LED itself; the other is the improper use of the LED.

LED failure cannot be found in the regular inspection test of LED. Under severe conditions such as high temperature, low temperature, and rapid temperature changes, due to the differences in thermal expansion coefficients of materials such as LED chips, epoxy resins, brackets, inner leads, solid-state adhesives, and PPA cups, the internal stresses are different. The mechanism of LED failure caused by electrostatic discharge is very complicated. Equipment, tools, utensils, and human bodies may carry static electricity and discharge it. This static electricity ranges from hundreds of volts to tens of thousands of volts. The discharge time is in the nanosecond range. Level.

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

In addition, the actual requirements for the out-of-control rate of the pixels are different in different occasions. Full-color LED display indicators are required to be controlled within one percent; monochrome LED display indicators are required to be controlled within one-tenth.