Several Tips To Identify The Quality Of LED Display

The surface flatness of the display screen should be within ±1mm to ensure that the displayed image is not distorted. Local convexity or concaveness will cause blind spots in the viewing angle of the display screen. The gap between the cabinet and the module should be within 1mm. If the gap is too large, the boundary of the display screen will be obvious and the visual coordination will be inconsistent. The quality of flatness is mainly determined by the production process.

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 5000cd/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 of the display screen is not the brighter the better, it should match the brightness of the LED package. Increasing the current to increase the brightness will cause the LED to lose its brightness too quickly and the life of the display screen will drop rapidly. You can ask the manufacturer to provide a parameter report to confirm. The brightness of the screen is mainly determined by the quality of the LED tube core.

The viewing angle refers to the maximum angle at which you can see the entire screen content from both sides of the screen. The size of the viewing angle directly determines the number of audiences of the display screen, so the larger the better. The viewing angle should be above 150 degrees. The size of the viewing angle is mainly determined by the packaging method of the tube core.

The white balance effect is one of the most important indicators of the display screen. In color science, 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 the actual ratio is slightly deviated, there will be a deviation in the white balance. Generally, attention should be paid to whether the white is blue or yellow-green. When the display is monochrome, the smaller the brightness and wavelength difference between the LEDs, the better. When standing on the side of the screen, there is no color difference or color cast, and the consistency should be good. The quality of white balance is mainly determined by the brightness and wavelength ratio of the LED tube core and the control system of the display screen. The tube core also affects the color reproduction.

Color reproduction refers to the color reproduction of the display screen, that is, the color displayed by the display screen must be highly consistent with the color of the playback source, so as to ensure the realism of the image.

Mosaic refers to the small square blocks that are always bright or always black on the display screen, that is, the module necrosis phenomenon, the main reason is that the quality of the IC or connector used in the display screen is not up to standard. Dead point refers to a single point that is always bright or always black on the display screen. The number of dead points is mainly determined by the quality of the tube core and whether the manufacturer's anti-static measures are perfect.

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 grayscale level and low scanning frequency.

Stability refers to the quality reliability of the LED display screen during the aging stage after it is made into a finished product. You can ask the manufacturer for aging records to get the number of conditions that occur during the aging of the screen to determine.

The LED display screen is composed of multiple boxes. Each box must be grounded externally, and the grounding resistance should be less than 0.1 ohm. And it can withstand high voltage, 1500V 1min without breakdown. Warning signs and slogans must be placed at the high-voltage input end and the high-voltage wiring of the power supply.

The LED display screen is a valuable commodity with a large weight. The packaging method used by the manufacturer is very important. Generally, it is packaged as a single box. Each side of the box must have protective materials to act as a buffer. The internal activity space of the box is not large during transportation. The outer packaging box must be clearly marked.