　　 What is the reason for the inconsistency of the brightness of the outdoor LED full-color display ? According to the experience of the LED electronic display manufacturer for many years, the following three factors can be summarized to cause the brightness of the LED full-color display to be inconsistent.
1, light-emitting components
The outdoor LED full-color display light-emitting component, that is, the LED light-emitting tube, is inconsistent in brightness during the production process. However, the countermeasure adopted by the LED electronic display manufacturer is to perform binning after the completion of production. The smaller the difference in brightness between the adjacent two files, the better the consistency, but the more stable the yield and the higher the inventory, the more severe the appearance. Therefore, each manufacturer has controlled the brightness difference between two adjacent gears at 20%.
2, the drive components
LED full color display drive components are usually constant current drive chips, such as MBl5026. These chips include 16 constant current drive outputs, which can be used to set the current output value. The error of each output of the same chip is controlled within 3%, and the output error of the chip is controlled within 6%. It is normal for the LED full-color display to show 25% brightness error between pixels. If the LED light-emitting tube is not the same level and type of full-color LED display, the brightness error will rise to more than 40%.
It is also worth noting that the brightness of the full-color LED display is inconsistent, which is the fundamental reason for the formation of the flower screen. It cannot be corrected by the late proofreading equipment, as long as it is produced by the LED display manufacturer. Therefore, if you purchase a screen with inconsistent brightness, please contact your service provider or manufacturer for solution.
3. The display screen is mixed in the production process, and different batches of dots are used .
How to solve the color difference of LED electronic display ?
The first method is to change the current flowing through the LED. Generally, the LED tube allows the continuous operating current to be around 20 mA. In addition to the saturation of the red LED, the brightness of the other LEDs is substantially proportional to the current flowing through;
The second method: using the visual inertia of the human eye, using the pulse width modulation method to achieve gray control, that is, periodically changing the optical pulse width (ie, duty cycle), as long as the period of repeated lighting is short enough (ie, refresh) The frequency is high enough) that the human eye does not feel that the illuminating pixels are shaking. Since pulse width modulation is more suitable for digital control, today, with the widespread use of microcomputers to provide and display indoor LED display content, almost all LED electronic displays use pulse width modulation to control gray levels.
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