Everyone knows that LED displays are customized products. They are not a simple buying and selling process like general electronic consumer products. Instead, they involve the implementation of a whole set of system design schemes, from pre-sales including design of other related industries to after-sales construction. Installation and maintenance often require integrators to complete. The small picture below will share with you the matters needing attention in the field survey before LED display sales.
led display
1. Preparation before site survey
It is necessary to communicate with users before departure to understand their specific requirements:
① The type and size of the display screen.
②Installation environment.
③Display content and method.
④Communication method.
How to determine the model of the display?
a) Display area, if the customer needs to achieve 2K effect (2048 1080 resolution, total pixels is about 2.21 million), divide 2.21 million pixels by the area to get the pixel density, and then compare the pixel density of the product to get the correlation Display model. Conversely, the required display area can be deduced by the display model and the required pixels.
B) Viewing distance, the calculation method of the visual distance of the LED display:
The smallest viewing distance can display smooth images
Visual distance of LED display = pixel pitch (mm)1000 (unit: meter)
The most suitable viewing distance The distance at which the viewer can see a highly clear picture
The best viewing distance of LED display = pixel pitch (mm) 3000 (unit: meter)
The farthest viewing distance: the farthest viewing distance of the LED display = screen height (m) 10 (times)
②Installation environment.
③Display content and method.
④Communication method.
2. Site survey content
① The state of the wall, the installation method (inlaid, floor-standing, hanging, wall-mounted, supporting, column-type) and the force of the location where the display is installed.
And according to the specific size of the display screen, confirm whether there are obstacles at the installation site hindering the installation of the display screen. In the case of inlaid installation, whether the reserved installation slot is suitable; if the wall has decorative partitions, you must ask the user about the condition of the wall and whether the solid wall behind the isolation board can bear the weight; if it is a column screen installation, it must be Understand the geological conditions clearly. (If there is mud and sand at the bottom of the geological layer, it will cause the risk of sinking or even collapsing of the column and the screen body for a long time, so you must not look at it like a horse.)
②The power supply situation on site. The capacity of the computer room or AC transformer, whether the cables need to be re-arranged, or whether the wire diameter of the laid-out cables meets the requirements; if it is single-phase power, whether there is a grounding wire; if it is three-phase power, whether it is three-phase five-wire . If you need to re-wiring, you need to accurately measure the length of the power cord on site.
③Understand the control position of the display screen and whether the communication line is unblocked. The length of the communication line required on site, and whether there are other devices that need to be connected to the display control terminal or understand the switching method of the on-site signal channel; if the user does not understand anything, at least the user's application needs must be understood, especially the theater Class users. If the user has already wired, ask whether the length and quantity of the wiring are appropriate; the normal synchronization system should use a super five network cable should be less than 120 meters, and the length of the non-super five network cable should be lower; if the number is not enough, the corresponding number of network cables must be increased. If it is too long, you must use a suitable optical cable. Use multi-mode fiber within 500 meters, and use single-mode fiber if it exceeds 500 meters. Regardless of whether it is the network cable or the number of optical fibers, there must be a spare.
④ Tools that need to be carried, such as tape measure or laser ruler. Do you need scaffolding or user-provided scaffolding. Whether the computer is provided by the user.
⑤The external environment of the site. Do you need to pay attention to moisture-proof when installed indoors, and whether you need to pay attention to the details of waterproof and lightning protection measures when installed outdoors; whether the location is close to the sea, close to a chemical plant, and how salt, alkali, and acid the air is. In addition, outdoor screen users need to observe the viewing distance of the audience, the height of the screen, and the direction of the sun. The viewing distance determines the minimum viewing distance and the best viewing distance to determine the model. The direction of sunlight determines the brightness and heat dissipation of the screen (direct sunlight has higher requirements for the brightness and heat dissipation of the screen).
⑥ Try to take photos with cameras as much as possible for all situations encountered on the scene, shooting in place with different angles and different details.
⑦ Whether the user has special requirements, whether it can be realized if there are special requirements, and the difficulty of the project.
⑧ If the merchant is responsible for the construction of the structure, it must be constructed in accordance with the construction drawings provided by us.
Three. Special considerations for outdoor screens
① In the maintenance method, the outdoor display screen considers waterproof and heat dissipation. Most of the outdoor display screens are installed in a box type. There is an apron between the unit board and the box body, which is fixed by screws. The unit board cannot be taken out from the front, only maintenance can be performed from the back of the display screen. Therefore, the thickness of the screen structure is about 80 cm.
② Heat dissipation problems, the display screen is installed outdoors, often exposed to the sun and rain, wind and dust cover, and the working environment is harsh. As a sealed structure, heat dissipation is usually carried out by air-conditioning active cooling or fans for air convection heat dissipation.
③ Other issues, for example, a relatively high display screen needs to be considered for lightning strikes, surge protection equipment needs to be added to the distribution box, and the screen itself needs to be grounded. To prevent damage to the screen due to lightning strikes.
