How can a layman distinguish the quality of the LED display? In general, it is difficult to convince the user based on the salesman’s self-justification. There are several simple methods to identify the quality of the full color LED display screen.
The surface flatness of the LED display screen should be within ±0.1mm to ensure that the displayed image is not distorted. Partial protrusions or recesses will lead to a dead angle in the viewing angle of LED display screen. Between the LED cabinet and LED cabinet, the gap between the module and module should be within 0.1mm. If the gap is too large, the border of LED display screen will be obvious and the vision will not be coordinated. The quality of flatness is mainly determined by the production process.
The brightness of the indoor LED screen should be above 800cd/m2, and the brightness of the outdoor LED display should be above 5000cd/m2 to ensure visual effect of the LED display screen, otherwise the displayed image will be unclear because the brightness is too low. The brightness of the LED display screen is not as bright as possible, it should match the brightness of the LED package. Blindly increasing the current to increase the brightness will cause the LED to decrease too fast, and the life of LED display will decrease rapidly. The brightness of the LED display is mainly determined by the quality of the LED lamp.
3. Viewing angle
The viewing angle refers to the maximum angle at which you can see the entire LED screen content from the LED video screen. The size of the viewing angle directly determines the audience of the LED display screen, so the bigger the better, the viewing angle should be more than 150 degrees. The size of the viewing angle is mainly determined by the packaging method of the LED lamps.
4. White balance
White balance effect is one of the most important indicators of LED display. In terms of color, pure white will be displayed when the ratio of the three primary colors of red, green and blue is 1:4.6:0.16. 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 bluish or yellowish. green phenomenon. In monochrome, the smaller the difference in brightness and wavelength between LEDs, the better. There is no color difference or color cast when standing on the side of the screen, and the consistency is better. The quality of the white balance is mainly determined by the ratio of the brightness and wavelength of the LED lamp and the control system of the LED display screen.
5. Color reducibility
Color reducibility refers to the color displayed on the LED display must be highly consistent with the color of the playback source, so as to ensure the authenticity of the image.
6. Whether there is mosaic and dead spot phenomenon
Mosaic refers to the small squares that are always bright or always black on the LED display, which is the phenomenon of module necrosis. The main reason is that the quality of the IC or lamp beads used in the LED display is not good. Dead point refers to a single point that is always bright or always black on the LED display. The number of dead points is mainly determined by the quality of the die and whether the manufacturer’s anti-static measures are perfect.
7. 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 the poor control system, low gray level and low scanning frequency.
8. Display stability
Stability refers to the reliable quality of the LED display in the aging step after it is finished.
The LED display is composed of multiple LED cabinets, each LED cabinet must be grounded, and the grounding resistance should be less than 0.1 ohms. And can withstand high voltage, 1500V 1min without breakdown. Warning signs and slogans are required at the high-voltage input terminal and the high-voltage wiring of the power supply.
10. Packing and Shipping
The LED display screen is a valuable commodity with a large weight, and the packaging method used by the manufacturer is very important. Generally, it is packaged in a single LED cabinet, and each surface of the LED cabinet must have protective objects to buffer, so that the LED has little space for internal activities during transportation.
Post time: Sep-13-2022