What if the pixels of full-color LED display are out of control
Sep 28, 2021
The display screen shows that some images on the other side 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 runaway pixels of the full-color LED display screen, so what is the reason and how to solve it?
Pixel out of control of full-color LED display is a common problem. What is the reason for this phenomenon and how to solve it? The following is the information shared by Royal Display:
Generally, the common display pixels consist of 2R1G1B (two red lights, one green light and one blue light, the same below) and 1R1G1B. Generally, out of control will 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 this pixel is out of control.
Therefore, it can be concluded that the main reason for the out of control of pixels of full-color LED display screen is the out of control of LED lights. The main causes of LED lamp failure can be divided into two aspects: first, the poor quality of LED itself, the second is the improper use of methods.
Led failure cannot be found in the routine inspection and test of LED. Under bad conditions such as high temperature, low temperature and rapid temperature change, due to the difference of thermal expansion coefficient of LED chip, epoxy resin, support, inner lead, solid crystal adhesive, PPA cup and other materials, it is caused by the difference of internal stress. The mechanism of LED failure caused by electrostatic discharge is very complex. Equipment, tools, utensils and human body may carry static electricity and discharge it. This static electricity is as low as hundreds of volts, as high as tens of thousands of volts, and the discharge time is at the nanosecond level.
If the blue-green tube fails, it is often that the led-pn junction is electrically punctured by electrostatic discharge. Due to the complex production process of LED display screen, electrostatic discharge prevention is impossible. Therefore, electrostatic protection must run through the whole production process.
In addition, the actual requirements of pixel out of control rate are different in different occasions, and the index of full-color LED display screen is required to be controlled within 1%; The indicators of monochrome LED display screen shall be controlled within one tenth.
