LED video wall

The LED video wall or LED screen is a direct vision LED display. In it, LEDs are used not as a source of light but as separate elements of a picture (pixels). Previously, manufacturers could not make a matrix with a small pitch of small LEDs, so LED screens were used on large venues, for sports scoreboards, large exhibition displays, concerts where high picture quality is not required. However, to date, manufacturers already offer various versions of LED displays, designed for around-the-clock use in video walls for a more custom format, in control rooms and situational centers. Their main advantage is high image brightness, low noise level, a thinner body, almost no visible seam and greater color uniformity.

To opt for one of the options for the implementation of the video wall, you must first understand whether the benefits from the introduction of the LED video wall overlap the negative aspects, and whether such a video wall will fully meet your objectives.

Pixel pitch

The pixel pitch primarily affects the perception of the displayed content from a specified distance. But it is not unimportant to consider that the pixel pitch of the video wall also affects the amount of information that can be displayed on the screen.

Often the pixel pitch is confused with the screen resolution. The pixel pitch measures the distance between the center points of two adjacent pixels, and the resolution is the total number of pixels in width and height of the screen. If you increase the diagonal of the display, the pixel pitch also increases, provided that the overall screen resolution remains constant.

Acceptable pixel pitch must be in the range of 0.6 to 1.3 mm. If the pixel pitch is too large, the fonts will be read worse, and the amount of information that can be displayed on the video wall will be limited. The pixel pitch may increase so much that viewers will be able to distinguish individual pixels and the space between them, which will adversely affect the ability to perceive information.

Price

On average, when calculating the cost of video walls, it can be assumed that the LED version of a video wall with a step of 1.5 mm costs about three times more than projection cubes of comparable size and brightness. It is also necessary to take into account the complexity of the installation of the LED video wall and, therefore, the cost will be higher than the installation of projection cubes. For mounting the LED screen requires a complex installation design.

Life time

The service life of LED screens is often much shorter compared to the video walls of other performance technologies. For many new models, it is significantly less than 100 thousand hours. For comparison: LED projection cubes are designed for 80-100 thousand hours. In other words, if the panel is designed for 50 thousand hours of work, then a threefold difference in price will actually mean an increase in expenses by 4-6 times.

To date, the LED screen remains a very expensive technology.

Power consumption

Manufacturers of LED displays talk about low power consumption of their devices, but you need to bring everything to a common denominator.

Different levels of brightness can be set on LED screens and projection cubes, so you should compare the same brightness and size. As a result, it turns out that projection cubes consume slightly less energy than LED displays. However, let's not forget that to display the same image, you will need a larger LED video wall. If you use a display with a pixel pitch of 3 mm, you will need 17 times more surface area and about 27 times higher power to display images with the same resolution as on the video cube.

Thus, the energy consumption of LED-systems in comparison with LED projection cubes is still excessively high.

Heat transfer

Heat dissipation affects the size and cost of the required air conditioning installation. When using the LED display on the existing control room, the total amount of generated heat will increase significantly, which will require replacement or upgrading of the cooling equipment. But it is also worth noting that since the LEDs of the LED displays are located on the outside of the screen, they do not need their own ventilation system.

Shell thickness

The undoubted advantage of LED displays is the smaller thickness of the shell when compared with video walls based on projection cubes. However, it should be noted that video cubes usually have front access, while on the LED display market, only models with rear access are being offered, which is why you have to design the mounting frame, taking into account the distance of several tens of centimeters from the wall. Therefore, the installation of these displays requires a distance not less and sometimes more than the width of the video wall based on projection cubes.

Thus, today LED technology has several advantages, however, it is necessary to take into account the calculation of the rationality of the use of such a video wall. It should also be understood for what purposes such a video wall will be primarily useful.

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