1. Flatness
The surface flatness of the LED display screen should be within 0≤a≤1mm to ensure that the displayed image is not distorted, and local protrusions or recesses will lead to a dead angle in the viewing angle of the display screen. The quality of flatness is mainly determined by three aspects: 1. production process and materials; 2. on-site steel engineering construction; 3. the quality of the installation and construction of the display installation team.
2. Brightness and viewing angle
The brightness of the indoor full-color LED display should be above 800cd/m2, and the brightness of the outdoor full-color LED display should be above 1500 cd/m2 to ensure the normal display of the LED display, otherwise the brightness will be too low and it will be difficult to see everything. displayed image. The level of brightness is mainly determined by the quality of the LED die.
The size of the viewing angle directly determines the visible area of the LED display, so the bigger the better. The size of the viewing angle is mainly determined by the LED chip.
3. White balance effect
White balance effect is one of the most important indicators of LED display. In terms of color, pure white will be 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 bluish or yellowish. green phenomenon. The quality of the white balance is mainly determined by the LED chip, and the LED chip also has an impact on the reproducibility of the color.
4. Color reducibility
Color reducibility refers to the color reducibility of the LED display, that is, the color displayed by the LED display 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, dead point phenomenon
Mosaic refers to the small squares that are always bright or always black on the LED display, which is the phenomenon of module necrosis. The light is not set up; ③ the sealant process is unqualified. The dead point refers to a single point that is often black on the LED display, and the number of dead points is mainly determined by the quality of the LED chip.
6. With or without color blocks
The color block refers to the lack of color in a small area; the main reason is to control the IC and power supply, and to control the quality of the circuit wiring.
7. Display appearance
Appearance of the display screen: It is the most intuitive and the most primitive to make the most preliminary evaluation of the quality of the product. The appearance quality can reflect the quality of the manufacturer's production process and materials.
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