How to judge the quality of LED video display screen

At present, LED electronic screen is entering millions of families. When choosing LED display, it is often difficult to choose the right product. How to buy LED products? This paper introduces the judgment standard of LED electronic screen.
1. Flatness
The flatness of the display surface must be within 1 mm to prevent distortion of the display image. If part of the surface is convex or concave, the visual angle of the display may become dead angle. The flatness is mainly determined by the production process.
2. Brightness and visual angle
The brightness of indoor full-color LED electronic screen is 800cd / m2 or higher, and that of outdoor full-color LED electronic screen must be 1500cd / m2 or higher, so that the display screen can work normally. Otherwise, the brightness is too low, and the displayed image is not obvious. The brightness is mainly determined by the quality of LED chip.
The size of the viewing angle directly determines the number of viewers on the LED electronic screen, so the larger the better. The size of the viewing angle is mainly determined by the packaging method of the die.
LED light electronic screen
3. White balance effect
White balance effect is one of the most important indicators of LED electronic screen. Chromatics is the ratio of red, green and blue primary colors. Only when the ratio is 1:4.6:0.16, it will show pure white. If the actual ratio is slightly deviated, there will be a deviation of white balance. Generally, we should pay attention to whether white is biased and yellow green. The quality of white balance is mainly determined by the display control system, and the chip affects the color reduction.
4. Color reduction
The color recovery ability can ensure the authenticity of the image, because the color displayed on the LED electronic screen matches the color of the playback source very well.
Is there mosaic or dead corner
Mosaic is the four bright and often black small squares on the LED electronic screen. The biggest cause of module necrosis is that the quality of the connecting device used on the display screen is turned off.
The dead point mainly depends on the quality of the die, which is the bright or often black single point on the LED electronic screen.
6. Whether there are color patches
The color difference between the adjacent modules is obvious, and the color conversion is based on the module. Therefore, the color block phenomenon is mainly due to the poor control system, low gray level and low scanning frequency.