Simply put, the quality of a full-color LED display can be identified from the following aspects:
1. Flatness The surface flatness of the LED display should be within ± 1mm ​​to ensure that the displayed image is not distorted, and local protrusions or recesses will cause the viewing angle of the display to appear dead. The quality of the 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 1500cd / m2 to ensure the normal operation of the display, otherwise the brightness will be too low to see clearly The displayed image. The brightness is mainly determined by the quality of the LED die.
The size of the viewing angle directly determines the number of display screen audiences, 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 White balance effect is one of the most important indicators of the display screen. Chromatically, pure white is displayed when the ratio of the three primary colors of red, green and blue is 1: 4.6: 0.16. If there is a slight deviation in the actual ratio, there will be a deviation in white balance. Generally, it is necessary to 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 screen, and the die also has an effect on the color reproduction.
4. Color reducibility Color reproducibility refers to the color reducibility 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 authenticity of the image.
5. The presence or absence of mosaic and dead spots Mosaic refers to the small four squares that are always bright or often black appearing on the display, which is the phenomenon of module necrosis. The main reason is that the quality of the connectors used in the display is not close.
The dead point refers to a single point that is always bright or often black appearing on the LED display. The amount of the dead point is mainly determined by the quality of the die.
6. The presence or absence of color blocks. Color blocks refer to the obvious color difference between adjacent modules. The color transition is based on the module. The color block phenomenon is mainly caused by the poor control system, the gray level is not high, and the scan Caused by lower frequency.
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