How to distinguish the led screen is good or bad?
A full-color display is good or bad can be signed from the following aspects:
Display surface flatness within ± 1mm to ensure that the displayed image is not distorted, locally raised or recessed cause the viewing angle of the display to dead ends. The quality of flatness is determined mainly by the production process.
2 brightness and viewing angle
Indoor full color brightness above 800cd/m2, outdoor full color brightness 1500cd/m2 in order to ensure the normal operation of the display because the brightness is too low, otherwise it will not see the image displayed. The size of the brightness of the LED die is good or bad decision.
Display the number of audience directly determine the size of the viewing angle, and therefore the bigger the better. The size of the viewing angle is mainly determined by the die package.
3 WB results
The white balance effect is one of the most important indicators in the display. Color science, when the proportion of the three primary colors of red, green and blue for 1:4.6:0.16 hours to appear pure white, if the actual proportion of any deviation occurs the white balance bias, generally pay attention to whether the white bluish, yellowish green phenomenon. The white balance is good or bad is determined mainly by the control system of the display tube core also have an impact on the reduction of color.
4 color reduction
The reduction of color is the color you want to display on the reduction of color, both display shows highly consistent with the source color, so as to ensure the realism of the image.
Whether the mosaic dead point phenomenon
Mosaic appears on the display are always lit or black box, both modules necrosis, mainly due to the display connector quality, but off.
Dead point is to appear on the display is lit or normally black single point, the number of dead point determined mainly by the good and bad of the tube core.
(6) whether the blocks of color
Blocks of color are more obvious color difference between adjacent modules, color transition module units, color phenomenon caused by poor control system, the gray level is not high, the lower scanning frequency caused.