With the advancement of social science and technology and the development of outdoor advertising, people have higher and higher requirements for display screens. A good display screen not only involves the improvement of the quality of life but also whether the advertising effect can be effectively disseminated. So how to choose a good quality LED large screen has become a problem that many buyers need to consider. Next, analyze this issue from the following key factors:

1. Flatness

The surface flatness of the LED display should be within 0≤a≤1mm to ensure that the displayed image is not distorted, and local protrusions or recesses will cause dead angles in the viewing angle of the display. The quality of the flatness is mainly determined by three aspects: ① production technology and materials; ② on-site steel engineering construction; ③ the installation and construction quality of the display installation team.

2. Brightness and viewing angle

The brightness of the indoor full-color LED display should be above 500cd /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 it will be difficult to see clearly because the brightness is too low The displayed image. The level of brightness is mainly determined by the quality of the LED tube core.

The size of the viewing angle directly determines the size of the viewing 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 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 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 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 reproduction of the color.

4. Color reduction

The color reproduction refers to the color reproduction of the LED display, that is, the color displayed on the LED display 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, dead point phenomenon

Mosaic refers to the small squares that are always bright or dark on the LED display, which is the phenomenon of module necrosis. The main reasons are: ①The quality of the connectors used in the LED display is not good enough, and there are protrusions or depressions; ②LED The lamp is not set right; ③The 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

Display appearance: it is the most intuitive and original to make the most preliminary evaluation of product quality. The appearance quality can reflect the quality of the manufacturer's production process and materials.