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Since the launch of the first batch of national smart city pilots in 2012, smart city construction has been put on the agenda. In 2014, the eight ministries and commissions including the National Development and Reform Commission, the Ministry of Science and Technology, and the Ministry of Public Security jointly issued the "Guiding Opinions on Promoting the Healthy Development of Smart Cities" and proposed that by 2020, a group of smart cities with distinct characteristics will be built, which will once again accelerate the pace of smart city construction.
Affected by this, various government departments have successively invested in the construction of informatization, visualization, and intelligent command office platforms, which have, to a certain extent, promoted the increase in demand for large-screen displays in the room, coupled with the gradual maturity of large-pitch products and huge technological advantages, making small Pitch LED products have increased rapidly in many fields such as security, weather, and transportation.
With the gradual advancement of smart city construction, the application of LED displays as digital display devices in smart transportation, information communities, smart medical care, etc. will continue to increase, adding to the LED display market expansion.
At present, led display in the market has matured, in our lives and work will be used to led display, there are many landmark buildings with led display is the finishing touch, icing on the cake. The perfect match with the building is to demonstrate the superb technology and art of LED display. However, if the selected led display often has problems, the picture quality is not high, and even a security problem arises. It's not just a matter of blocking people, it's a terrible thing. Therefore, it is very important to choose a high-quality led display.
Surface roughness
According to the conventional standard, the flatness of the surface should be within ±1mm. The purpose of this is to ensure that the display image does not distort, and that the local bulge or indentation will cause a blind angle in the viewing angle of the display screen.
Color reproduction
Color is a standard that can best reflect the quality of the LED display. The reproducibility of the color, that is, the color of the display screen should be highly consistent with the color of the playback source, so as to ensure the realism of the image.
brightness
Indoor LED full-color display brightness to 800cd/m2 above, outdoor LED full-color display brightness to 1500cd/m2 or more, in order to ensure the normal operation of the display, otherwise it will be too low to see the brightness is not clear Image. The brightness is mainly determined by the quality of the LED die, so the quality of the LED chip is very important.
Viewing angle
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 LED die.
White balance effect
The ratio of red, green and blue primary colors to 1:4.6:0.16 will show pure white. A slight deviation will lead to an imbalance, which is a very important factor in the late use.
There is no mosaic, dead point phenomenon
Mosaic refers to the light or dark four squares appearing on the display screen, that is, the phenomenon of module necrosis. The main reason is that the quality of the IC or the connector used in the display is not excessive. The dead point refers to a single point that appears on the display screen, either constantly or normally. The number of dead spots is mainly determined by the quality of the die and the manufacturer's anti-static measures.
There is no color block
The color patches refer to the obvious color difference between adjacent modules. The color transition is based on the module. The color patching phenomenon is mainly caused by poor control system, low gray level, and low scanning frequency.
safety
Led display is composed of multiple boxes, each box must be done outside the ground protection, grounding resistance should be less than 0.1 euro. And can withstand high pressure, 1500V1min does not breakdown. Marks and slogans must be warned at the high voltage input and at the high voltage connection of the power supply.
In addition to these above, there is a very important and very necessary aspect is the led display power supply, wire, PCB board. Poor power supplies can cause the power supply to run overloaded, cause frequent screen failures, and even cause fires. PCB board if the material is inferior, the copper coating is thin, the design is unreasonable, and the poor technology leads to the phenomenon of short circuit in the copper wire, which becomes the root cause of fire hazards. The quality of wire rods on the market is uneven. Many wire rods are copper clad aluminum. The appearance of copper wires is actually aluminum alloy wire. This wire is generally used for temporary use and cannot be used on regular products. Although the formal led display manufacturers will not appear these issues in terms of materials, but can not ignore this issue, can not rule out poor manufacturers shoddy, disrupt the market, deceive consumers.