The flatness of the display screen should be within ±1mm to ensure that the displayed image is not distorted, and local projections or recesses will cause the viewing angle of the display screen to appear dead angle. The quality of the 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/sqm, and the brightness of the outdoor full-color screen must be above 1500cd/sqm to ensure the normal operation of the display screen, or the displayed image will not be clear because the brightness is too low. The brightness is mainly determined by the quality of the LEDs. The size of the viewing angle directly determines the audiences quantity, so the larger the better. The size of the viewing angle is mainly determined by the packaging method of the LEDs.
3. White balance effect
White balance effect is one of the most important indicators of the display screen. Chromatically, the pure white will be displayed when the ratio of the three primary colors of red, green and blue is 14.60.16. If the actual ratio is slightly deviated, the deviation of white balance will appear. It is necessary to pay attention to whether the white is bluish or yellowish green. The quality of the white balance is mainly determined by the control system of the display screen, and the LEDs also has an effect on the color reproduction.
4. Color reducibility
The color reproducibility refers to the color reproducibility of the display screen. The color must be highly consistent with the color of the playback source, so as to ensure the authenticity of the image.
5. Whether there is mosaic or dead spots
Mosaic refers to the small squares that are always bright or often black appearing 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 enough.
Dead point refers to a single point that is always bright or often black appearing on the display. The number of dead points is mainly determined by the quality of the LEDs.
6. If there is color blocks
Color block refers to the existence of relatively high color difference between adjacent modules. The color transition is caused by the module as a unit. The color block phenomenon is mainly caused by poor control system, low gray level and low scanning frequency.
Contact Person: Mr. Warren Wang