VIDEO WALL - EXCESSIVE WASTE OR OBJECTIVE NEED?
A video wall is a product consisting of professional displays connected together. Most often, to maintain the original aspect ratio of the source, close to 16: 9, it is necessary to build walls with the same number of displays horizontally and vertically. For example, two displays vertically and two horizontally (professionals talk about the dimension of a video wall like 2X2), three displays vertically and three horizontally (three-by-three dimension), and so on.
This combination of displays was chosen not only because of the resolution of the source, but also on the basis of another important factor. The manufacturers, knowing the standard combinations of displays in the video wall, have integrated processors into professional displays to help its creator. With their help, the construction of standard video walls is simplified as much as possible. And the next step for manufacturers was to add the ability to transmit the source signal sequentially to each of the displays in the video wall. These steps significantly increased the attractiveness of video walls and made them easier, eliminating the need for the owner to buy an expensive external video wall processor. Which drastically reduced the cost of creation and the cost of ownership.
After installing on the mounts, in accordance with the dimension of the video wall, and connecting the displays in series with the video cables, the engineer only needs to enter the total number of displays in the video wall and the number (location) of the specific display in this video wall into the processor of each display. And the processor of each display will cut out a piece of the image corresponding to the position of the display in the wall, creating a single, large picture. Do this most often using the remote control.
To organize remote control of the video wall, it may be necessary to connect the control computer using its COM port connections to the COM IN connector of the display receiving the signal from the source. The remaining displays are connected in series using the COM OUT connector of the current display, connecting it to the COM IN of the next display. Having access via a network or the Internet to such a computer, through a special program that transmits control codes to the COM ports of displays, you can control the video sequence and the way each display is displayed in the video wall. COM port came to us from the distant past of the IT industry and looks quite archaic. Therefore, manufacturers, trying to simplify the switching process, go to interesting engineering solutions. For example, when creating EliteBoard displays, the COM port connector was made in the form of a technologically advanced and affordable RJ-45 connector. New models of professional EliteBoard displays are supplied with both a remote control and a cable for connecting to the COM port of the control computer. This gives the customer a wide field of choice for the installation method and remote control of the operation of video walls on EliteBoard displays.
I would like to pay attention on the three most important rules for placing displays in a video wall relative to each other and surrounding objects, as well as transporting displays.
1. Between each surface adjoining the other display that surrounds the display of the metal case or the side of the seamless panel, a gap of at least 0.5 mm must be left. This is due to two factors:
a) thermal expansion of the metal
b) the load of the upper display on the lower.
Thermal expansion of the neighboring display with close contact creates pressure and mechanical stress, which is dangerous for the integrity of the screen, the sad result of which could be the destruction of the matrix. The same danger is created by the “lying” on the lower display;
2. Also, the thermal gap should be between the video wall and the surrounding objects. For example, if you place a video wall in a deep niche, then on each side of the video wall and behind it you must leave at least 15 cm of free space for heat dissipation;
3. Equally important is the technology for transporting and moving displays. The thin frames of the displays are intended only to protect the package of different matrix layers from dust and light touches when carrying. These frames will not save from shock, or from a heavy load when lowering the display on either side to a hard surface. These effects will result in chips or cracks in the matrix. Most professional displays are equipped with carrying handles and only they can be used. There is another option - the use of "suction cups" designed to carry large-sized flat objects such as glasses or mirrors, if this is possible in the instructions. It is forbidden to take the professional display when carrying or removing it from the packaging for the bottom side and will lead to destruction of the screen. Displays may only be transported in an upright position.
The only correct position of the display (unless otherwise specified in the instructions) for mounting is to place the display face down on a soft elastic surface that overlaps the size of the display perimeter (so that no part of the frame is in the air). The degree of protection of the screen is determined by the manufacturer. For example, professional EliteBoard displays, in addition to a special anti-reflective coating, also use a layer that protects from scratches and increases the resistance of the screen to external influences.
What exactly are video walls for? There is an undeniable and unambiguous niche that competitive devices are not yet able to occupy. This refers to a video demonstration in brightly lit rooms with high image quality. Video projectors are good in resolution, but cannot, until at a comparable price, overexposure the sun, and LED displays that cope with high illumination, at a comparable cost, can not boast of high resolution. Such places are most often found in shopping centers or large chain stores, train stations and airports. Receptions of large companies also often use video walls to create creative designs.
Another right area, densely occupied by video walls, are situational centers, control rooms and video surveillance rooms. Due to a combination of indicators: low cost of ownership, high fault tolerance, high MTBF, high resolution, wide viewing angles, high contrast and resistance to illumination by spurious sources, there is no alternative to video walls in this segment.
Seeing the relatively slow pace of development of video projectors and LED displays, a revolution in this segment should not be expected. So in the short term, you can safely use video walls in projects as the optimal solution in terms of price / functionality / quality.
© ELITEBOARD RUS LLC, Scherbak Nikolay, Business Development Manager.