P3.91 outdoor /indoorled screen modules.What are the factors that affect the contrast of LED display screens?

　　Screen flatness and screen surface reflectance

　　Local protrusions or recesses in LED display screens can cause blind corners in the visual angle of the display screen, and the surface flatness should be within ± 1mm to ensure that the displayed image does not distort. At the same time, reducing the reflectivity of LED panels can improve the contrast of the display screen, making the image clearer.

　　LED display screen grayscale level

　　The higher the grayscale level, the richer and more vibrant the colors are. On the contrary, the display color is single and the changes are simple. The increase in grayscale level can greatly enhance color depth, resulting in an increase in the geometric number of display levels of image colors.

　　Point spacing

　　The smaller the dot spacing, the more delicate the display and the corresponding increase in contrast.

　　Light source intensity, light source angle, and testing instrument angle

　　These three basic variable factors together determine the final published LED display screen contrast. It is not appropriate to compare the test results of different products unless the tests of different displays are unified. In the real viewing and testing environments, these three variables still have a certain correspondence.

　　Lamp bead quality and failure rate

　　LED display screens are composed of tens of thousands or even hundreds of thousands of red, green, and blue LED beads. The brightness of LED beads will gradually decrease with increasing usage time, which will also affect the contrast of LED displays.

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