LED screens use more advanced technologies every day and the distance between pixels is being reduced considerably to such an extent that the LEDs of the panels are so small that it is difficult to see them with the naked eye. When using such a high pixel density it is advisable to use systems that protect the LEDs and make them more resistant. For this purpose, there are two solutions for small pixels. The AOB and GOB solutions provide additional resistance to the LED panels to make them more resistant and easier to handle.
AOB literally means “admixture on board” referring to an adhesive resin. A layer of resin is sprayed covering the bottom of the LED and the top of the PCB so that it strengthens the bond between the LED and the board. In addition, this system does not affect the display quality at all.
–Improves the impact resistance of the LEDs. Thanks to the AOB resins, the resistance of the junction of the LEDs with the board is multiplied by 6. Protecting much better against scratches, impacts and scratches that may occur during the process of handling, installation and use of the screen.
–Improves the front sealing of the LED module by protecting the soldering points against water and dust.
–Allows LED boards with smaller pixels and wider viewing angles.
–Slightly improves the color consistency and contrast of the boards by coating the sides and soldering feet of the LED with a resin.
–Reduces the rate of defective LEDs during manufacturing by providing more secure and durable joints and improving board reliability.
AOB is the last process in the SMD system of electronic board manufacturing. After component placement and soldering, the LED module is subjected to a 72-hour series of performance tests to ensure good color balance and uniformity. This allows correcting or discarding any factory defect before applying the resin protection. Finally, after passing the performance tests, a layer of polymer resin is dispersed on the surface of the module which will build up between the LEDs, reinforcing their bond with the board and providing additional protection.
Visually you will notice a matte translucent black resin layer between the LEDS and the LED module PCB. This resin layer provides some enhancements to the contrast and reflectivity of the display. The matte black color allows for an enhanced contrast effect comparable to using black front side SMD LEDs. In addition the reflectivity of the resin slightly improves the viewing angles of the display. This is achieved by improving the reflectivity alleviating color consistency losses when viewing the display from a wide viewing angle.
A patented transparent resin is used to cover the entire module or LED panel on its upper part. This system has the advantage of protecting the LED panels much better against manipulation and transport, preventing LEDs from breaking or jumping out of the screen when receiving a scratch or accidental impact. These events are a much more common factor than it may seem and cause most of the maintenance interventions of a LED display. Buying a screen with GOB protection guarantees a foolproof resistance of the screen surface. The only drawback is that this resin may lose its properties over time and slightly affect the display quality.
GOB LED modules are especially useful for installing screens that are highly exposed to elements that can damage the integrity of the screen: weather conditions, contact with the public, accidental impacts, etc.
The best protection available for your display. This is achieved by completely sealing the front of the LED module. This technology creates a tough transparent resin layer on top of the LEDS protecting them from impact, dust and weathering in the most effective way.
Increased durability. Avoids breakage of LEDs during installation, transportation and use. Increased reliability of the LEDs is remarkable since the resin is only applied on tested and verified LED boards.
Better contrast: The matte finish of the resin coating slightly increases the contrast of the image and reduces reflections on the screen surface.
Better image consistency: The resin coating acts as a lens that improves the light diffusion of the screen, resulting in greater image consistency and uniformity and wider viewing angles.
Improved screen flatness. GOB protection results in a totally flat LED module surface that provides a uniform and robust appearance to the display.
Avoidance of maintenance. The superior strength of these LED modules means far fewer module replacements in a display, which is much more common in displays that do not have this protection system.
Reduction of blue light: The screens with GOB resin emit very little blue light and are less aggressive than traditional LEDs.
Difficulty of repair. In the event that a GOB module requires repair on the front of the module, this will be much more complicated or impossible because the protective resin will be permanently bonded. In these cases the costs of part replacement versus repair must be evaluated.
Alteration of the transparency of the resin over time. Over the years the surface of the resin may lose transparency due to wear caused by the heat of the LEDS themselves. The appearance of this problem is very variable and depends on the environmental conditions in which the screen works.
Loss of flatness of the screen. Temperature differences over the years can cause slight deformations in the resin layer showing a less flat appearance than at the beginning of its useful life.
The application methodology is similar between the 2 systems, but with a different resin formulation resin is used since in the case of GOB a total coating of the LED is performed. This creates a totally uniform resin layer that protects the entire screen surface.
For very small pixels such as P1.9 and below (P0.9, P1.2 and P1.5) we recommend GOB. In these cases the extra protection of the GOB system is more than justified by the cost of the modules for these types of pixels. With such small LED sizes, the force required to cause damage to the display surface is very low and the risk of damage to the LEDs is very high. To mitigate this risk, the use of LED modules with GOB protection is highly recommended.
For P2.5 pixels and larger we recommend AOB. It is an excellent protection system that will protect your investment without adding excessive overhead. These LEDs already have a larger contact area, but it is still highly recommended to protect your investment.
Of course you can also choose the level of protection you want for your project as we offer custom made screens. If you need more information please contact us.
The LED display screen produced by LEGIDATECH is made of 1.5mm thick galvanized iron plate. The advantage is low manufacturing cost, and it can be customized to produce outdoor LED display screens of different shapes according to the needs of different scenes, such as outdoor cylindrical LED display screens, spherical LED display screens, etc. This means that the size of such LED display screens can be freely customized.
Die-cast aluminum cabinets are often used in outdoor LED display screens. They are characterized by high strength and precision, light weight, and more importantly, seamless splicing, which can have better effects on screen display. The die-cast aluminum LED display screen adopts one-time molding of the mold, and the flatness of the cabinet is more guaranteed, which basically solves the problem of cabinet joints; the humanized design is more convenient and lighter to install, and the cabinet joints and connecting wires are more reliable; the weight is light, and the hoisting structure is adopted, which is more convenient and firm to install; the signal and power connection between the cabinets adopts concealed connection, and no traces of connecting wires can be seen after installation. (OK series cabinet pictures can be placed)
Magnesium alloy is an alloy composed of magnesium and other elements. The characteristics of outdoor LED display screens made of magnesium-aluminum alloy are: low density, high strength, good heat dissipation, good shock absorption, greater impact load bearing capacity than aluminum alloy, and good resistance to organic and alkali corrosion. Magnesium alloy is used as outdoor LED display cabinet with high cost performance, easy installation, and excellent heat dissipation, which makes the product more market-advantaged. The disadvantage is that the cost of magnesium alloy cabinet is also higher than other cabinets.
The outdoor LED display project is a comprehensive project integrating electronics, optics, communications, computers, networks, structures, civil engineering and decoration.
Hunan LEGIDATECH Technical Engineering will elaborate on outdoor LED display solutions for you. According to the solution of outdoor LED display, you can easily estimate and purchase outdoor LED display.
When surveying the site, first determine the installation location of the display screen.
The key point is to determine on-site whether to install it on a certain wall, under a beam, between columns, etc.
This is reflected in the drawing by determining the column and beam numbers on the left and right sides of the screen in the plan view. Determine the bottom elevation of the screen in the elevation view.
Determining the location of the control room is to determine where the control room is and how far it is from the outdoor LED screen.
Through on-site observation, questioning relevant personnel of Party A, and consulting relevant construction and civil engineering drawings, determine the stress-bearing points (surfaces) of the screen.
Ensure that the building structure can bear the weight of the outdoor LED display.
Through on-site observation and consulting drawings related to strong and weak current pipelines in buildings, determine the direction and length of strong and weak current cables, and whether wire troughs or wire conduits need to be laid.
Because the length of cables and communication signal lines determines the solution for the outdoor LED display control system.
Determine the installation positions of power distribution cabinets, cabinets, audio, and main consoles with users. Different installation positions affect the difficulty of construction.
Environmental requirements for outdoor LED display screens: waterproof, moisture-proof, shock-proof, anti-collision, anti-electromagnetic interference, anti-low temperature, etc.
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This requires our outdoor LED display to have good waterproof and moisture-proof properties.
According to different environmental requirements, when purchasing outdoor LED displays, special attention should be paid to the key technical parameters of outdoor LED displays.
① External environmental factors: areas with high temperature and humidity, areas exposed to ultraviolet rays, extremely cold areas, coastal areas, earthquake-prone areas, and lightning-prone areas.
② Internal environmental factors: various sports venues (basketball hall, volleyball hall, football hall, swimming pool, ice hockey hall), electromagnetic radiation sensitive areas, noise sensitive areas.
③ Construction environment factors: airports, highways, skyscrapers, mobile vehicle screens, etc.
① The outdoor display screen is installed outdoors and is often exposed to the sun, rain, wind and dust, and the working environment is harsh.
If electronic equipment is wet or severely dampened, it may cause short circuit or even fire, resulting in losses.
② Outdoor displays may be attacked by strong electricity and magnetism caused by lightning.
③ The ambient temperature changes greatly. Outdoor displays generate a certain amount of heat when working.
If the ambient temperature is too high but the heat dissipation is poor, the integrated circuit may not work properly or even be burned, causing the display system to fail to work properly.
④ Outdoor display screens have a wide audience, require long viewing distance, wide field of view, large changes in ambient light, and may be exposed to direct sunlight in particular.
① The joint between the outdoor LED screen and the building must be strictly waterproof and leak-proof.
The screen must have good drainage measures so that once water accumulates, it can be drained smoothly.
② Install lightning protection devices on outdoor display screens and buildings.
The main body and shell of the outdoor display screen should be well grounded, and the ground resistance should be less than 32Ω, which can discharge large currents caused by lightning in a timely manner.
③ Install ventilation equipment to cool down so that the internal temperature of the screen is between -10~40°C.
An axial flow fan is installed on the back and top of the outdoor LED display screen to discharge heat.
④ The outdoor LED display uses industrial-grade integrated circuit chips with an operating temperature between -40~80°C to prevent the display from being unable to start due to low temperatures in winter.
⑤ In order to ensure long-distance visibility in strong light environments, outdoor LED displays must use ultra-high brightness LEDs.
⑥ The outdoor LED display uses SMD LED lamp beads, which have wide viewing angles, pure colors, consistent and coordinated colors, and a lifespan of over 100,000 hours.
When making outdoor LED displays, we determine the dimensions of the outdoor LED displays on site. Suppose we measure 10 meters long and 6 meters wide.
Our LED display cabinet size is 960mm*960mm. We can determine the number of boxes for outdoor LED displays.
10m*÷960mm≈10.≈10
6m*÷960mm≈6.25≈6
Then the actual size of the outdoor LED display is: length 960mm*10=mm
Width 960mm*6=mm
Since there are many types of outdoor LED display steel structures, LEGIDATECH here shows you the outdoor column steel structure drawings for your reference.
Structural diagram of outdoor single-column LED display steel frame
If there are generally two control system solutions for outdoor LED display screens, one is a synchronous control system and the other is an asynchronous control system.
It is recommended to use an asynchronous LED control system for small-area outdoor LED displays, and to use a synchronous control system for large-area outdoor LED displays.
LEGIDATECH recommends using Nova synchronous control system, as shown below:
Outdoor LED display synchronous control system diagram
Here, LEGIDATECH takes the OK series outdoor P10 LED display as an example:
Required size: 9.6M long × 5.76M high = 55.296㎡
Module size: 480mm (width) × 320mm (height)
Cabinet size: 960mm (width) × 960mm (height)
Box arrangement: 10 pcs (length) × 6 pcs (height) = 60 pcs
Actual display size: 5.12m (width) × 3.84m (height) = 55.296㎡
Outdoor LED displays need to choose different types of outdoor LED displays according to different outdoor environments, and then determine the installation dimensions of the LED display and the steel structure design drawings of the outdoor LED display.
Recommend outdoor LED display control systems to customers based on their specific needs and provide customers with quotation plans for outdoor LED displays.
I hope this complete outdoor LED display solution can provide you with a reference to help you quickly formulate an outdoor LED display quotation plan.
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