A LED full-color display is good or bad, mainly from the following aspects to sign:
The surface roughness of the display screen should be within + 1mm, so as to ensure that the display image does not distort, and that the local projection or concavity causes the visual angle of the display screen to appear dead angle. The flatness is mainly determined by the production process.
Two brightness and visual angle
Indoor full color brightness to above 800cd/m2, the brightness of outdoor full color in 1500cd/m2 above, in order to ensure the normal work of the image display, or because the brightness is too low and can not see the show. The brightness is mainly determined by the quality of the LED core.
The size of the visual angle directly determines how much the screen audience, so the bigger the better. The size of the viewing angle is determined mainly by the way the core is encapsulated.
Three. White balance effect
The white balance effect is one of the most important indicators of the display. Color on the popular green colors of the ratio of 1:4.6:0.16 only shows the pure white, there is a deviation if the actual percentage point deviation will appear white balance, the general attention to the bias of blue and white or yellowish green. The quality of white balance is decided by the control system of LED full-color display screen, and the core has influence on the reducibility of color.
Four. Color reduction
The reduction of color means the reduction of color to the screen. Both the color displayed on the screen and the color of the source must be highly consistent, so as to ensure the reality of the image.
Five. Are there mosaic or dead center phenomenon?
Mosaic refers to the display of often bright or often black small squares, both die necrosis phenomenon, the main reason for the display of the connector quality is not pass.
Dead center refers to the display of the usual bright or often black single point, the number of dead center is mainly determined by the quality of the core.
Six. With or without color blocks
Color block refers to the obvious difference between the adjacent modules, the color transition to modules as a unit, causing the phenomenon of color blocks, mainly due to poor control system, gray scale is not high, low scanning frequency caused.