1. Flatness The flatness of the surface of the display
screen should be within ±1mm to ensure that the displayed image is not distorted, and local protrusions or recesses will cause a blind spot in the viewing angle of the display screen. The gap between the box and the box, and the gap between the module and the module should be within 1mm. If the gap is too large, the boundary of the display screen will be obvious and the vision will be uncoordinated. The quality of flatness is mainly determined by the production process. 2. Brightness and viewing angle The brightness of the indoor LED full-color screen must be above 800cd/m2, and the brightness of the outdoor full-color screen must be above 5000cd/m2 to ensure the normal operation of the display, otherwise it will be difficult to see because the brightness is too low. The displayed image. The brightness of the 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 quickly, and the life of the display will drop rapidly. The manufacturer can be required to provide a parameter report to confirm. The brightness of the screen is mainly determined by the quality of the LED die. Viewing angle refers to the maximum angle at which you can see the content of the entire screen from the two measurements of the screen. The size of the viewing angle directly determines the audience 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 die. 3. White balance effect The white balance effect is one of the most important indicators of the led display. 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 a little different, the white balance will be deviated. Generally, pay attention to whether the white is blue or yellow. Green phenomenon. When monochromatic, the brightness difference and wavelength difference between the LEDs are as small as possible. Standing on the side of the screen, there is no color difference or color cast, and the consistency is better. The quality of the white balance is mainly determined by the LED die brightness wavelength ratio and the control system of the display. The die also has an impact on the color reproduction. 4. The reducibility of color The reducibility of color refers to the reducibility of the display screen, which means that 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. Whether there is mosaic or dead spots. Mosaic refers to the small four squares that are always bright or black that appear on the display. It is the phenomenon of module necrosis. The main reason is that the quality of the IC or connectors used in the display is not good enough. Dead spot refers to a single spot that is always bright or black that appears on the display screen. The number of dead spots is mainly determined by the quality of the die and whether the manufacturer's anti-static measures are perfect. 6. With or without color block 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 scanning Caused by lower frequency. 7. The stability of the display screen refers to the reliable quality of the screen in the aging stage after it is made into a finished product. It can be judged by asking the manufacturer for the aging record to get the status of the screen body during aging. 8. Security The screen is composed of multiple boxes, and each box must be grounded for outsiders, and the grounding resistance should be less than 0.1 ohm. 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. 9. Packaging and transportation of screens are valuable goods, and the weight is very large. The packaging method used by the manufacturer is very important. Generally, it is packaged in a single box, and each side of the box must be protected by a buffer, and there is not much room for internal movement during the transportation of the box. The outer packing box must be clearly marked. The first choice for full-color [Technology] manufacturer-About City Technology Co., Ltd. is committed to the overall solution of large-screen , focusing on indoor , outdoor , full-color , indoor full-color , etc., the industry's first third-generation COB display technology, and a leading domestic full-color integrated operation service provider, providing customers with professional and first-class services!
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