Evaluate the quality of the LED display
The evaluation of LED display screen mainly pays attention to the following aspects:
The surface flatness of the display screen should be within ±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 screen. The quality of flatness is mainly determined by the production process.
2. Brightness and viewing angle
The brightness of the indoor full-color screen must be above 800cd/m2, and the brightness of the outdoor full-color screen must be above 1500 cd/m2 to ensure the normal operation of the display screen, otherwise the displayed image will not be clear due to the low brightness. The brightness is mainly determined by the quality of the LED tube core.
The size of the viewing angle directly determines the audience of the display screen, so the bigger the better. The size of the viewing angle is mainly determined by the packaging method of the die.
3. White balance effect
The white balance effect is one of the most important indicators of the 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 control system of the display screen, and the die also affects the reproduction of the color.
4. Color reduction
The color reproduction refers to the color restoration of the display screen, that is, the color displayed on the display screen must be highly consistent with the color of the playback source, so as to ensure the realism of the image.
5. Is there any mosaic and dead spots?
Mosaic refers to the small squares that are always bright or dark on the display screen, which is the phenomenon of module necrosis. The main reason is that the quality of the connectors used in the display screen is not good enough.
The dead point refers to a single point that is always bright or dark on the display screen. The number of dead points is mainly determined by the quality of the die.
6. With or without color blocks
Color block refers to the obvious color difference between adjacent modules. The color transition is based on the module. The color block phenomenon is mainly caused by poor control system, low gray level and low scanning frequency.