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Full-color LED display pixels out of control? How to solve blind spots and frequent bright spots?
by：Demo
2021-07-01
The pixel out of control of LED full-color display is a common problem. What is the reason for this imagination and how to solve it? Let's learn about it today.
What is pixel out of control?
Pixel out of control rate refers to the proportion of the smallest imaging unit (pixel) of the display that is not working properly (out of control).
The ratio of the number of out of control pixels to the total number of pixels in the full screen, we call it the 'full screen pixel out of control rate'. In addition, in order to avoid the concentration of out-of-control pixels in a certain area, we propose the 'regional pixel out-of-control rateThis indicator quantifies the requirement that 'out-of-control pixels are discretely distributed' in the 'General Specification for LED Displays' SJ/T11141-2003, which is convenient and intuitive.
Two modes of pixel out-of-control
One is the blind spot, that is, the blind spot. It does not shine when it needs to be bright, which is called the blind spot.
The second is a constant bright spot, which is always on when it is not bright, which is called a constant bright spot. Generally, the composition of pixels includes 2R1G1B (2 red lights, 1 green LED Light module, and 1 blue light, the same applies to the following), 1R1G1B, 2R1G, 3R6G, and so on.
Out-of-control usually does not mean that the red, green, and blue lights in the same pixel are all 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. For the sake of simplicity, we perform statistics and calculations of out-of-control pixels according to the primary colors of the LED display (ie, red, green, and blue), and take the maximum value as the pixel out-of-control rate of the display.
What should I do if the pixels of the LED full-color display are lost?
Generally, the common display pixel components are 2R1G1B (2 red lights, 1 green LED Light module and 1 blue light, the same as below) and 1R1G1B, and out of control is generally not the red, The green and blue lights are all 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 can not be found in the regular inspection and test of LED. 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 to it. Such static electricity can range from hundreds of volts to tens of thousands of volts. The discharge time is in the order of 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 for the pixel out-of-control rate are different. 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. At present, there is no good solution for the pixels of the full-color LED display. It is recommended to contact your service provider and return to the factory for repair. If the repair cost is too high, you can consider replacing the defective module unit board.
At present, the domestic LED display screen will be aging (baking machine) before leaving the factory, and the LED lights of the out-of-control pixels will be repaired and replaced. The 'whole screen pixel out of control rate' is controlled within 1/104, and the 'area pixel out of control' It’s no problem to control the “rate” within 3/104. Some individual manufacturers’ corporate standards require that no out-of-control pixels are allowed before leaving the factory, but this will inevitably increase the manufacturer’s manufacturing and maintenance costs and extend the delivery time. In different applications, the actual requirements for the pixel out-of-control rate can be quite different. Generally speaking, LED display screens are used for video playback, and the index requirements are acceptable and reachable within 1/104; If it is used for simple character information publishing, it is reasonable to control the indicator within 12/104.
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What is pixel out of control?
Pixel out of control rate refers to the proportion of the smallest imaging unit (pixel) of the display that is not working properly (out of control).
The ratio of the number of out of control pixels to the total number of pixels in the full screen, we call it the 'full screen pixel out of control rate'. In addition, in order to avoid the concentration of out-of-control pixels in a certain area, we propose the 'regional pixel out-of-control rateThis indicator quantifies the requirement that 'out-of-control pixels are discretely distributed' in the 'General Specification for LED Displays' SJ/T11141-2003, which is convenient and intuitive.
Two modes of pixel out-of-control
One is the blind spot, that is, the blind spot. It does not shine when it needs to be bright, which is called the blind spot.
The second is a constant bright spot, which is always on when it is not bright, which is called a constant bright spot. Generally, the composition of pixels includes 2R1G1B (2 red lights, 1 green LED Light module, and 1 blue light, the same applies to the following), 1R1G1B, 2R1G, 3R6G, and so on.
Out-of-control usually does not mean that the red, green, and blue lights in the same pixel are all 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. For the sake of simplicity, we perform statistics and calculations of out-of-control pixels according to the primary colors of the LED display (ie, red, green, and blue), and take the maximum value as the pixel out-of-control rate of the display.
What should I do if the pixels of the LED full-color display are lost?
Generally, the common display pixel components are 2R1G1B (2 red lights, 1 green LED Light module and 1 blue light, the same as below) and 1R1G1B, and out of control is generally not the red, The green and blue lights are all 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 can not be found in the regular inspection and test of LED. 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 to it. Such static electricity can range from hundreds of volts to tens of thousands of volts. The discharge time is in the order of 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 for the pixel out-of-control rate are different. 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. At present, there is no good solution for the pixels of the full-color LED display. It is recommended to contact your service provider and return to the factory for repair. If the repair cost is too high, you can consider replacing the defective module unit board.
At present, the domestic LED display screen will be aging (baking machine) before leaving the factory, and the LED lights of the out-of-control pixels will be repaired and replaced. The 'whole screen pixel out of control rate' is controlled within 1/104, and the 'area pixel out of control' It’s no problem to control the “rate” within 3/104. Some individual manufacturers’ corporate standards require that no out-of-control pixels are allowed before leaving the factory, but this will inevitably increase the manufacturer’s manufacturing and maintenance costs and extend the delivery time. In different applications, the actual requirements for the pixel out-of-control rate can be quite different. Generally speaking, LED display screens are used for video playback, and the index requirements are acceptable and reachable within 1/104; If it is used for simple character information publishing, it is reasonable to control the indicator within 12/104.
If you are looking to get started with About Us, it's important to find a quified . Let Demo Photoelectric Technology (Wuxi) Co., Ltd. be your provider. Visit us at Demo Led Module.
If you need About Us solution, you should always consult a professional provider. Demo Photoelectric Technology (Wuxi) Co., Ltd. is one such a competent provider that is highly qualified to offer a wide range of products and services. Visit today!
Offering a loyalty program not only makes customers feel valued, but it allows Demo Photoelectric Technology (Wuxi) Co., Ltd. to easily collect important information about customers.
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