1. Flatness  The flatness of the surface of the display screen of the LED publicity vehicle should be within ±1mm to ensure that the display image does not distort, and the local raised or recessed leads to a blind angle of the viewing angle of the display screen. The flatness is mainly determined by the production process. . The founder of Liansen has 20 years of experience in the industry and is the earliest leader in research and development of LED electronic screens in China. Our company has an independent research and development department and a quality inspection department. We have a strong ability to innovate and strive for excellence in the production process. 2. Brightness and viewing angle   Indoor full-color screen brightness should be 800 cd/m 2 -2000 cd/m 2 , outdoor full-color screen brightness should be 6000cd/m 2 or more, LED brightness requirements: outdoor sun ≥ 7000 cd/m 2 ; outdoor back ≥ 4000 cd /m 2 ; To ensure the normal operation of the display, otherwise it will not see the displayed image because the brightness is too low. The brightness is mainly determined by the quality of the LED die. The size of the viewing angle directly determines the number of display audiences, so the bigger the better. The size of the viewing angle is mainly determined by the packaging method of the die. Liansen cooperates with a number of LED chip makers, all of which use original large-screen die brands such as the original American Corey, Nichia Japan, Taiwan wafer, Taiwan Guanglei, Hangzhou Silan, etc. to ensure LED color chips from the source. quality. Outdoor LED large screen has relatively high brightness requirements, especially in summer, the sunlight is very strong. Therefore, without sufficient brightness support, the color LED display will be grayed out and the viewing effect will be greatly reduced. Our company selected LED red tubes, pure green tubes, and pure blue tubes to reach the national standard. The brightness of the entire screen can reach 6000-8000cd/m2. 3. White balance effect   The white balance effect is one of the most important indicators of the display. In color science, when the ratio of the three primary colors of red, green, and blue is 3:6:1, pure white will be displayed. If the actual proportion is a little biased, there will be a white balance deviation. Generally, it should be noted whether the white color is bluish or yellowish. Green phenomenon. The quality of white balance is mainly determined by the display's control system, and the die also has an impact on the reproducibility of color. 4. reducing color   The reproducibility of color refers to the reproducibility of the display screen to color, and the color of the display screen must be highly consistent with the color of the playback source, so as to ensure the realism of the image. 5 there is no mosaic, dead point phenomenon   Mosaic refers to the light or dark four squares appearing on the display screen. This is due to the necrosis of the module. The main reason for this is that the quality of the connectors used in the display is not critical. The dead point refers to the single point of the light or darkness that appears on the display screen. The number of dead spots is mainly determined by the quality of the die. According to the SJ/T11141-2003 industry standard, the out-of-control ratio of pixels in the indoor screen should not be greater than 3/10000, and the out-of-control ratio of pixels in the outdoor screen should not be greater than 2/1000, and it should be a discrete distribution. At present, the uncontrolled quality of pixels in the Unicolor full-color display screen is strictly controlled within the industry standard, not only to meet customer requirements, but also to pursue the perfection of its own product quality. 6. There is no color block    Color refers to the presence obvious color difference between adjacent modules, the color transition of module units, causing poor color phenomenon is mainly by the control system, the gray level is not high, due to a lower scanning frequency. Spur Gear,High Precision Spur Gear,Small Heat Pump Water Heater,Ce Small Heat Pump Water Heater Taizhou Hongxiang Power Machinery Co.,Ltd , https://www.tzhxcamshaft.com