With the progress of social science and technology and the development of outdoor advertising, people have higher and higher requirements for display screen. A good display screen not only involves the improvement of the quality of life, but also involves whether the advertising effect can be effectively spread. So how to choose good quality LED screen has become a problem that many buyers need to consider. This problem is analyzed from the following key factors:
1. The flatness
The surface flatness of the LED display should be within 0≤ A ≤1mm to ensure that the display image does not distort. Local convex or concave will lead to dead Angle of the display. The quality of flatness is mainly determined by three aspects: (1) production technology and materials; ② On-site steel engineering construction; ③ Decision of installation and construction quality of display panel installation team.
2. Brightness and viewing Angle
The brightness of indoor full-color LED display should be above 800cd/m2, and that of outdoor full-color LED display should be above 5500 CD /m2 to ensure the normal display of LED display. Otherwise, it will be difficult to see the displayed image due to the low brightness. The brightness level is mainly determined by the quality of the LED tube core.
The size of the visual Angle directly determines the amount of LED display visual area space, so the bigger the better. The size of the viewing Angle is mainly determined by the LED chip.
3. White balance
White balance effect is one of the most important indicators of LED display. In chromology, when the proportion of red, green and blue primary colors is 1:4:6:0.16, pure white will be displayed. If the actual proportion has a little deviation, there will be a deviation of white balance. Generally, attention should be paid to whether white is blue or yellow-green. The quality of white balance is mainly determined by THE LED chip, and the LED chip also has an effect on the reducibility of color.
4.LED color reduction
Color reducibility refers to the color reducibility of LED display, that is, the color displayed by LED display should be highly consistent with the color of the source, so as to ensure the sense of reality of the image.
5. Whether there are mosaics and dead spots
Mosaic refers to the small four squares that appear on the display screen are always on or often black, which is the phenomenon of module necrosis. The main reasons are: (1) the connector quality used by the LED display screen is not good enough to have a raised or concave phenomenon; The LED lamp is not adjusted; The sealing glue process is unqualified. Dead point refers to the LED display often black single point, the number of dead point is mainly determined by the quality of LED chip.
6. There is no color block
A color block is a small area that lacks color; The main reason is to control IC and power supply, control the quality of circuit layout
7. Display appearance
Screen appearance: is the most intuitive, the most original quality of the product to do the most preliminary evaluation. Appearance quality can reflect the manufacturer’s production technology and material quality.