As for the flatness of the display screen, this does not require professional instruments, and visual inspection is generally used. The normal flatness of the display should be guaranteed to be within ±1mm, so as to ensure that the picture played by the screen will not be distorted, but any local protrusion or depression will lead to a dead angle of the display. During the installation process, it is best to ensure that the module and There are no gaps between modules. Be aware of this especially when assembling displays below P3, as you will most likely see black lines.
2: Brightness and visual angle:
Tthe brightness of indoor full color screen shall be 800-2000cd/m2, and the brightness of outdoor full color screen shall be 5000-7500cd/m2, so as to ensure the normal operation of the display screen. Otherwise, the displayed image will not be clear because the brightness is too low or too high. The brightness is mainly determined by the crystal size of LED tube core. The visual angle directly determines the How much, so the bigger the angle, the better. Its size is mainly determined by the packaging method of the tube core.
3: White balance effect:
White balance effect is one of the important indicators of the display screen. In color theory, when the ratio of the three primary colors of red, green and blue is 1:4.6:0.16, pure white will be displayed. If there is a deviation in white balance, generally pay attention to whether the white is bluish or yellowish green. The quality of white balance is mainly determined by the control system of the display screen
It is decided that the die also has an effect on the reproducibility of the color.
4: Whether there is color block color difference:
color block refers to the large color difference between adjacent modules. The color transition is based on modules. The color block phenomenon is mainly caused by poor control system, low gray level and low scanning frequency.
5: Reducibility of color:
The color reversibility refers to the color reversibility of the display screen, that is, the color displayed on the display screen should be highly consistent with the color of the playback source, so as to ensure the authenticity of the image.
6: Mosaic and dead spot:
Mosaic refers to the effect that the color of the unit module is uneven on the display screen. The small four squares that are always bright or black, that is, the module is necrotic. The main reason is that the quality of the connectors used for the display screen is not up to standard. Dead point refers to a single point that is always bright or dark on the display screen. The number of dead points is mainly determined by the quality of the tube core.