The “mosaic” phenomenon has always been a problem that has plagued LED display manufacturers. From the phenomenon point of view, the phenomenon of “mosaic” of LED display screen is manifested as inconsistency of the brightness sub-region of the display surface, that is, poor uniformity. The root cause of the mosaic is actually the consistency of the lamp itself and the consistency defect during use.
What is the mosaic phenomenon of LED display?
The LED module is actually a product formed by arranging LEDs (light emitting diodes) together according to certain rules and then encapsulating them, plus some waterproof treatment, which is the LED module. The quadrilateral module may be provided with a decorative structure on the main view surface 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 dislocated short lines. Using visual linearity, human vision cannot scan from top to bottom (or left and right). Taking into account the two dislocations at the same time, it is bound to form numerous dislocation discontinuous short line segments, thus completely eliminating the LED display mosaic phenomenon formed by the gaps between the modules.
LED modules are widely used in LED products. There are also relatively large differences in structure and electronics. A simple module uses a circuit board and a housing with LEDs to become an LED module. The module is added with some control, constant current power supply and related heat dissipation treatment to make the LED life and luminous intensity better.
How to solve the “mosaic” problem?
The same batch of red, green, and blue LEDs should be used on each LED display, and the red, green, and blue of this batch of LEDs need to be reclassified. For constant current devices, it is necessary to perform inter-chip grading, which 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, and standard production fixtures are used to ensure that the LED lights are uniform in the same module. in the same equilibrium position.
When controlling the mold making process, it is necessary 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, the light is fixed with the standard front cover. Each LED unit board needs to perform 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 needs to adopt the steel reinforced structure, and reinforce the reinforcement in the appropriate position. Ensure the rigidity and flatness of the box plane. The numerical control equipment used for punching and bending the box is formed at one time, and the numerical control punching machine is used to ensure the accuracy of the module installation. And there is an appropriate margin to eliminate accumulated errors.
Post time: Sep-23-2022