On the display screen, part of the image is not bright, or the place that should be bright is not bright, and the place that should not be bright is still on. Yes, yes, these can be caused by the pixel out of control of the full-color LED display. Then the reason What is it and how to solve it?
Out-of-control pixels of a full-color LED display is a common problem. What is the reason for this imagination and how to solve it? The following is the information shared by Winbond:
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In general, the common display pixel components are 2R1G1B (2 red lights, 1 green light, and 1 blue light, the same as below) and 1R1G1B, and out of control is generally not the red, green, and blue in the same pixel All the lights 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 pixel out-of-control of the full-color LED display is the out-of-control of the 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 method.
LED failure cannot be found in the routine inspection and testing of LEDs. Under severe conditions such as high temperature, low temperature, and rapid temperature changes, it is caused by the difference in thermal expansion coefficients of materials such as LED chips, epoxy resin, brackets, inner leads, bonding glue, PPA cups, etc., which cause different internal stresses. The mechanism of LED failure caused by electrostatic discharge is very complicated. Equipment, tools, utensils and human body may be charged with static electricity and discharge it. This static electricity can range from a few hundred volts to tens of thousands of volts, and the discharge time is in the order of nanoseconds. level.
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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, under different occasions, the actual requirements for the pixel out-of-control rate are different. The indicators of full-color LED display screens are required to be controlled within one percent; the indicators of monochrome LED display screens are required to be controlled within one-tenth.
