How to control and improve the quality of LED full color display Full color LED display directly related to the display of the user, the audience, in order to obtain the perfect experience, you need to control and improve the quality of the LED display. So, how to control and improve the quality of LED full color display? LED full color LED display reflects the important indicator of what is the quality? LED devices as the most critical part of the full-color LED display for three reasons: First of all, LED is the most used key device in the full color screen machine, which will use thousands to tens of thousands of LEDs per square meter. Secondly, LED is the main body that determines the performance of the entire screen optical display, which directly affects the audience's evaluation on the display screen. Again, the largest proportion of LED in the overall cost of the display, ranging from 30% to 70%. LED choice determines the entire screen more than 50% of the quality. If you can not choose a good LED, no matter how good the other components of the display screen can not make up for the quality defects. LED full color LED display reflects the important indicators of quality are: First, the failure rate As the full-color display by tens of thousands or even hundreds of thousands of red, green and blue composed of three kinds of LED components of the yuan, the failure of any color LED will affect the overall visual display screen. In general, according to industry experience, the failure rate before LED display starts assembling to 72 hours aging should not be higher than three ten thousandths (referring to the failure caused by LED device itself). Second, anti-static ability LED is a semiconductor device, sensitive to static electricity, can easily lead to static electricity failure, so anti-static ability of the life of the display is crucial. In general, LED human body static mode test failure voltage should not be less than 2000V. Third, consistency Full-color display is composed of countless red, green and blue LED components composed of each color LED brightness, wavelength consistency determines the consistency of the entire screen brightness, white balance consistency, color consistency. In general, display manufacturers require device suppliers to provide LEDs in the 5nm wavelength range and 1: 1.3 brightness range, which can be graded by the device supplier through a spectrophotometer. Voltage consistency is generally not required. Fourth, brightness LED brightness is an important determinant of display brightness. The higher the LED brightness, the greater the current margin, to save power and maintain LED stability is good. LED has different angle values, the chip brightness has been set, the smaller the angle, the brighter LED, but the smaller the viewing angle of the display. General should choose 100 LED to ensure that the screen enough perspective. For different point spacing and different line of sight of the display, brightness, angle and price should find a balance point. Fifth, the attenuation characteristics Red, green, and blue LEDs all have the property of decaying brightness as working time increases. The merits of LED chips, the quality of auxiliary materials and the level of packaging technology determines the level of LED decay rate. In general, 1000 hours, 20 milliampere normal temperature light test, the red LED attenuation should be less than 10%, blue, green LED attenuation should be less than 15% Red, green and blue attenuation of the consistency of the full-color LED display The future of the white balance of a great impact, thereby affecting the display fidelity display.
One is a special type of ship. It has a flat, square head, side shoots, shallow draft, the ratio of length to width, has the characteristics of wide, large, flat, shallow. This type of ship is not afraid of the beach, can sail in the sea of sandy seabed, but also in the rivers and lakes in the navigation. Sand flat bottom can sit beach, not afraid to run aground. In the wind and waves are also safe. In particular, the wind direction is not at the same time, due to the shallow draft shallow, by the impact of the tide is relatively small, relatively safe
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Two is a superior performance in offshore navigation. How many ship mast sail can sail upwind, can sail in the ocean. Sand mast tall, high mast sail high, for the wind, and it has a shallow draft, low resistance, so fast sea voyage. Sand can sail with the wind, the wind can also sail upwind, even top water can sail, good seaworthiness. Ship navigation performance, seven wind sail smoothly, while the waves, so the sand can sail.
Three is a heavy load. General recorded that sand load is four thousand to six thousand stone stone (about five hundred to eight hundred tons). Also said that the sand carrying capacity is 2000 stone to 3000 stone (about 250 tons to 400 tons), the Yuan Dynasty ocean ship 9000 stone (1200 tons and above).
The disadvantage of sand
1, the shortcomings of sand is affected by water area. Due to the bow for the tablet, slower. Therefore, on both sides of the boat in the middle of the added water board [waist camel], on both sides of the bow adding Mizuki stems, in the stern of the hanging basket of peace [in case of large waves fashion rocks the boat], greatly enhances the stability. Especially after installed flashings, ability makes the wind sail already have driving is enhanced. This ship can still drive safely in the case of wind seven.
2, sand waves ability, inland water transport has a large transport capacity, can adapt to the characteristics of river shore shoal. But it reflects great weakness in offshore Hainan airlines. During the Yuan Dynasty, the government from the Yangtze River mobilized consisting of more than 900 boats Barge fleet against the Japanese, in western Japan Sea typhoon after almost annihilated. Since then, the Japanese call typhoon "kamikaze", is from here. Therefore, it is generally used in inland waterway transport and in the special seasons for the use of transport supply ships.
Because of the sand has the characteristics, so it in inland civil transport use is very extensive, along the coast have traces of sand. During the western Zheng He, Zheng He of the fleet of treasure ships have sand ship. At the same time, Zheng He's treasure ship is in the area of Nanjing treasure shipyard, built there is mostly sand ship ship.
Sand in China lasted for a long time in history, Emperor Daoguang's reign of the Qing Dynasty, Shanghai has sand 5000 ships, it is estimated that when the sand in the total number of more than million vessels. Sand occupies an important position in the history of China shipping.
Sand Barge Transport Sand Barge,Floating Crane Barge,Deck Barge,Split Hopper Barge Unisite Group Ltd. , http://www.unisitemarine.com