Outdoor LED full color display brightness inconsistency is what reason? According to LED electronic display manufacturers for many years of experience, summed up the following three factors can lead to LED full color display brightness inconsistency.
1, light-emitting element
LED full color display LED components that LED tube, in the production process is inconsistent brightness is inevitable. But the LED electronic display manufacturers to adopt the countermeasure is completed in the production after the sub-file, adjacent to the difference between the brightness of the two smaller, the better the consistency, but the formation of low yield and high inventory of the more severe appearance. Thus, the manufacturers are adjacent to the brightness difference between the two orders at 20% or so.
2, drive components
LED full color display driver components are usually constant current driver chip, such as MBl5026 and so on. These chips include 16 constant current drive output, you can use the resistance to set the current output value, the same chip output error control within 3%, not the same chip output error control within 6%. LED full color display panel between the 25% brightness error is normal, if the use of LED tube is not the same level, type full color LED display, will make the brightness error rose to 40% or more.
Also worth noting is that full-color LED display brightness is inconsistent, is the root cause of the formation of Huaping, can not use the late proofreading equipment to correct, as long as the manufacturers led by the production process to achieve. So the purchase of inconsistencies to the brightness of the screen, please contact your service provider or factory needs to solve.
3, the display in the production process mixed with the material, with a different batch of lattice.
How to solve the LED electronic display color is different?
The first method is to change the current flowing through the LED, the general LED tube allows continuous current at 20 mA or so, in addition to the red LED saturation phenomenon, the other LED brightness is basically proportional to the flow of current;
The second method: the use of human eye visual inertia, with the pulse width modulation method to achieve gray-scale control, that is, periodically change the optical pulse width (ie duty cycle), as long as the repetition of the light cycle is short enough The frequency is high enough), the human eye does not feel the luminous pixels in jitter. As the pulse width modulation is more suitable for digital control, so in the general use of microcomputer to provide LED display content today, almost all of the LED electronic display are using pulse width modulation to control the gray level.