Uniformity is an important indicator to measure the pros and cons of LED display screens. If the LED display screen pixels and modules are not uniform, it will cause a little bit of splendor, and the phenomenon of brilliance will be caused. The professional term is "dust effect" and " Mosaic phenomenon".  

 

The root cause of the unevenness of the LED display is mainly the inconsistency of various performance parameters of the LED, the insufficient assembly accuracy of the LED display in the production and installation process, the insufficient consistency of the electrical parameters of other electronic components, and the inconsistent design of modules and PCBs. Specifications, etc. Among them, "the inconsistency of LED performance parameters" is the main cause. The inconsistencies of these performance parameters mainly include: inconsistent light intensity, inconsistent optical axis, inconsistent color coordinates, inconsistent light intensity distribution curves of each primary color, and inconsistent attenuation characteristics.  

 

So, how to solve the inconsistency of LED display performance parameters? At present, there are two main technical approaches in the industry: one is to improve the consistency of LED performance by further subdividing the LED specifications; the other is to improve the uniformity of the display through subsequent corrections. The follow-up calibration has also developed from the early module calibration and module calibration to today's point-by-point calibration. The correction technology has evolved from pure light intensity correction to light intensity color coordinate correction. But follow-up correction is not a panacea. Among them, inconsistent optical axis, inconsistent light intensity distribution curve, inconsistent attenuation characteristics, poor assembly accuracy, and irregular design cannot be eliminated by subsequent correction, and even such subsequent correction will cause light The inconsistency in shaft, attenuation, and assembly accuracy is even worse.

 

Through practice, it is known that the follow-up calibration is only to cure the meter, and the LED parameter subdivision is the root cause, and it is also the mainstream of the future development of the LED display industry.