The quality of LED display
How to Distinguish The Quality of LED Screens?
Let us learn the following points about the quality of a full-color LED display.
The flatness of the surface of a LED display should be within ±1mm to ensure that the display image does not distort, and the local bulge or indentation can cause a blind angle in the viewing angle of the display. The production process determined The flatness mainly.
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 5500cd/m2 to ensure the normal operation of the display. Otherwise, the brightness will be too low and it will be difficult to see the displayed image. The quality of the LED die determined the size of the brightness mainly . The size of the viewing angle directly determines the audience of the display screen, so bigger viewing angle is better. The packaging method of the die mainly determined the viewing angle.
White balance effect
White balance effect is one of the most important indicators of a LED display. In color science, when the ratio of the three primary colors of red, green, and blue is 1:4.6:0.16, pure white is displayed. If the actual ratio slightly deviates, there will be a white balance deviation. Generally, it should be noted whether the white color is bluish or yellowish. Green phenomenon. The control system of the LED display determined the quality of white balance mainly. The die also influences the reducibility of color.
Reducibility of color
The reduction of color refers to the reduction of the color of the LED display screen. And, the color of the display screen of the LED display must be highly consistent with the color of the playback source, so as to ensure the realism of the image.
Is there a mosaic or dead point phenomenon?
Mosaic refers to the light or dark four squares appearing on the LED display screen. It is not only the quality of the connectors used in the LED display but the quality of the connectors.
The dead point refers to the single point of the light or darkness that appears on the LED display. The quality of the die determined the number of dead spots mainly.
There is no color block
The color patches refer to the obvious color difference between adjacent modules. The color patching phenomenon is mainly caused by the poor control system, low gray level, and low scanning frequency.
Blind spot rate control
The blind spot rate is usually bright spots, dead spots and dark spots. The blind spot rate of outdoor screens should be less than 3/10000, and the blind spot rate of indoor screens should be controlled at 2/10000.