When we usually buy items, we usually shop around. Even if we decide which one to buy, we will choose carefully. The same is true when purchasing an LED display. So, when buying, how to distinguish the quality of the LED display? YONGS LED to tell you.
1. Flatness The surface flatness of the LED display should be within ±1mm to ensure that the displayed image will not be distorted, and local bulges or recesses will lead to a dead angle in the viewing angle of the display. The quality of flatness is mainly determined by the production process.
2. Brightness and viewing angle The brightness of the indoor full-color screen should be above 800cd/m2, and the brightness of the outdoor full-color screen should be above 1500cd/m2 to ensure the normal operation of the display, otherwise the brightness will be too low and it will be difficult to see everything. displayed image. The size of 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 bigger 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. In terms of color, pure white will be displayed only 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 bluish or yellowish. 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 impact on the reproducibility of the color.
4. Color reducibility The reducibility of color refers to the reducibility of the display screen to the color, 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. Whether there is mosaic or dead point Mosaic refers to the small squares that are always bright or always black 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. Dead point refers to a single point that is always bright or always black on the LED display, and the number of dead points is mainly determined by the quality of the die.
6. With or without color block 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 the poor control system, low gray level, scanning due to lower frequency.
