The quality of a full-color display can be signed from the following aspects:
1. Flatness
The surface flatness of the display screen should be within ±1mm to ensure that the displayed image is not distorted, and local protrusions or recesses will cause a blind spot in the viewing angle of the display screen. The quality of flatness is mainly determined by the production process.
2. Brightness and viewing angle
The brightness of the indoor full-color screen must be above 800cd/m2, and the brightness of the outdoor full-color screen must be above 1500 cd/m2 to ensure the normal operation of the display, otherwise the displayed image will not be clear because the brightness is too low. The brightness is mainly determined by the quality of the LED die. The size of the viewing angle directly determines the audience of the display screen, so the larger the better. The size of the viewing angle is mainly determined by the packaging method of the die.
3. White balance effect
The white balance effect is one of the most important indicators of the display. In color science, 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 the actual ratio is a little different, there will be a deviation of white balance. Generally, pay attention to whether the white is blue or yellow. Green phenomenon. The quality of the white balance is mainly determined by the control system of the display, and the die also has an impact on the color reproduction.
4. Color reproducibility
Color reproducibility refers to the reproducibility of the color of the display screen, that is, the color displayed on the display screen must be highly consistent with the color of the playback source, so as to ensure the realism of the image.
5. Whether there is mosaic or dead spots
Mosaic refers to the small four squares that are always bright or black that appear on the display screen, which is the phenomenon of module necrosis. The main reason is that the quality of the connectors used in the display screen is not good enough. The dead point refers to a single point that is always bright or black that appears on the display. The number of dead points is mainly determined by the quality of the die.
6. Whether there are color blocks
Color block refers to the obvious color difference between adjacent modules. The color transition is based on the module. The color block phenomenon is mainly caused by poor control system, low gray level, and low scanning frequency.
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