The "mosaic" phenomenon in the full-color LED display has always been a problem that has plagued LED display manufacturers. Its manifestation is the inconsistency of the brightness of the display surface in different regions. From the phenomenon point of view, the phenomenon of "mosaic" of the LED display screen is manifested as the brightness of the display surface, that is, the uniformity is poor. The poor uniformity of the LED display screen includes two aspects: poor brightness uniformity and poor chromaticity uniformity. Poor uniformity, "mottling" or "mosaic" phenomenon will seriously affect the viewing effect of the image. The root cause of the mosaic is the consistency of the lamp itself and the consistency defects during use.  

 

　1. What is the mosaic phenomenon of LED display? The LED module is a product composed of LEDs (light emitting diodes) arranged together according to certain rules and then packaged, plus some waterproof treatment. The main view of the quadrilateral module may be provided with a decorative structure for blurring the boundaries of module splicing. From the perspective of vision and optics, the utility model of LED module COB light source LED surface light source makes straight lines form dislocation short lines. Using the linearity of vision, the human eye cannot take into account the two dislocations at the same time when scanning from top to bottom (or left and right). strips, it is bound to form countless dislocation discontinuous short line segments, thus completely eliminating the mosaic phenomenon of LED display screens formed by gaps between modules.  

 

　　

LED modules are widely used in LED products. There are also great differences in structure and electronics. The simple thing is to use a circuit board and shell with LEDs to become an LED module. On some controls, constant current source and related heat dissipation treatment make LED life and luminous intensity better.

 

2. How to solve the "mosaic" problem of LED display? Use the same batch of red, green and blue LED lights on the LED display manufacturer, and re-classify the red, green and blue of this batch of LED lights . The constant current device is divided into 5 grades, and the constant current source of each grade is evenly distributed to the whole screen for LED unit board production. Standard production fixtures are used to ensure that the LED lights are in the same module. the same equilibrium position.

 

Control the mold making process to ensure that all LED lights in the module are not abnormally offset horizontally, up and down, and front and back. After the glue is poured, use the standard front cover to fix the light. Each LED unit board performs single-module brightness adjustment, that is, white balance fine-tuning, to ensure uniform white balance between modules.

 

Assemble the modules into a box. The box body adopts the steel reinforced structure, and the reinforcement is added in the appropriate position. Ensure the rigidity and flatness of the box plane. The punching and bending of the box is formed by CNC equipment at one time, and the CNC punching machine is used to ensure the accuracy of the module installation. And there is an appropriate margin to eliminate accumulated errors.