What should I do if the pixels of the full color LED display are out of control?

The display screen shows that some of the images are not bright, or the places that should be bright are not bright, and the places that should not be bright are still bright. Yes, yes, these can be caused by the loss of control of the pixels of the full-color LED display, then the reason What is it and how to solve it?

Full-color LED display pixels are out of control is a relatively common problem, what is the reason for this imagination, and how to solve it?

Common display pixels are composed of 2R1G1B (2 red lights, 1 green light and 1 blue light, the same as the following) and 1R1G1B, and out of control generally will not be all red, green and blue lights in the same pixel at the same time. Out of control, but as soon as one of the lights is out of control, we consider this pixel out of control.

It can be concluded that the main reason for the loss of control of the pixels of the full-color LED display is that the LED lights are out of control. 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 method.

LED failures cannot be detected during routine inspection testing of LEDs. Under harsh conditions such as high temperature, low temperature, and rapid temperature changes, due to the difference in thermal expansion coefficients of LED chips, epoxy resin, brackets, inner leads, die-bonding glue, 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 bodies may have static electricity and discharge it. This static electricity is as little as a few hundred volts and as high as tens of thousands of volts, and the discharge time is in nanoseconds. Level.

If the blue-green tube fails, it is often caused by the breakdown of the LED-PN junction by electrostatic discharge. Due to the complicated production process of LED display screens, electrostatic discharge is difficult to prevent. Therefore, electrostatic protection must run through the entire production process.

In addition, in different occasions, the actual requirements of the pixel out-of-control rate are different. The full-color LED display index is required to be controlled within one percent; the monochrome LED display index is required to be controlled within one-tenth. At present, there is no good solution for the pixels of the full-color LED display. Return to the factory for maintenance. If the maintenance cost is too high, you can consider replacing the module unit board in question.

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