Manufacturers suggest you how to solve the LED display color brightness difference

A good led full-color display must adapt to different temperatures, different weather, can be used normally in various occasions, and also have a good effect for the far and near light, especially in large-scale concerts, special effects lighting must be particularly excellent, but sometimes we will find that the LED brightness is not the same, What is the reason for the inconsistent brightness of LED full-color display?
1. Light emitting element
Led full-color display light-emitting elements, namely LED light-emitting tubes, in the production process, brightness inconsistency is inevitable. However, the countermeasures adopted by LED electronic display manufacturers are to classify the products after production. The smaller the brightness difference between the two adjacent products, the better the consistency. However, the more severe the appearance of low yield and high inventory will be.
2. Driving element
The driving elements of LED full-color display are usually constant current driving chips, such as mbl5026. These chips include 16 constant current drive outputs, and the current output value can be set by resistance. The error control of each output of the same chip is less than 3%, and that of different chips is less than 6%. It’s on.
In addition, it is worth noting that the brightness of full-color LED display is inconsistent, which is the fundamental reason for the formation of flower screen. It can not be corrected by the later proofreading equipment, as long as it depends on the production process of LED display manufacturers. So if you buy a screen with different brightness, please contact your service provider or manufacturer.
3. In the production process, different batches of dot matrix 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 working current to be about 20 mA. Except that the red LED is saturated, the brightness of other LEDs is basically proportional to the current flowing through;
The second method: using the visual inertia of human eyes, using pulse width modulation method to achieve gray control, that is, periodically changing the light pulse width (i.e. duty cycle), as long as the cycle of repeated lighting is short enough (i.e. the refresh frequency is high enough), human eyes can not feel the light-emitting pixels shaking. As PWM is more suitable for digital control, it is widely used in today’s computer to provide the content of LED display screen. Almost all LED electronic display screens use PWM to control the gray level.