LEDs instantly respone to turning on/off, so the LED SMD screen does not have the “loop” effect that can observed in the dynamic image of some LCD panels. Their life cycle does not depend on the number of on/off switches. None of the existing video screens (LCD, CRT, plasma, projection) can compete in sunlight in terms of contrast and viewing angle with LED screens.
The lifespan of LEDs is usually specified up to 50% loss of brightness. This means that the SMD screen will continue to work, but at a lower brightness.
An LED screen (or ice screen) is a display that forms an image using LEDs.
LED panels or modules are the component segments from which an LED SMD screen is assemble. All LED screens produce in the form of standard modules, from which the screen of the require size is then assemble. The dimensions of the modules differ depending on the manufacturer and type of screen. Therefore, when ordering a screen, you need to prepare for the fact that the size may differ slightly from the requested one. Of course, you can make custom-made modules of non-standard sizes, but this will affect the price of the screen.
Sometimes LED panels are call LCD panels with LED backlight. This is a misnomer because they use LEDs only to create the backlight, and the image is formed by a liquid crystal display (LCD) matrix.
In addition to rigid modules, flexible modules of stable quality have now become available. Using them you can assemble curved screens.
For screens of the first type, individual LEDs of different colors are combined into groups of several pieces. Each such group forms one pixel. There is at least one red, blue, and green LED in a group. By mixing these three basic colors you can get the entire spectrum. SMD Screens made using RGB technology are brighter and are design for outdoor use.
Screens of the second type consist of SMD LEDs, in which semiconductors of different “colors” are sealed into one housing. Each LED is a pixel and is capable of reproducing the entire spectrum of colors. Visually, screens of the second type have a more even and smooth surface. SMD screens have lower brightness but higher resolution. They are use both outdoors and indoors.
The third type is COB/GOB. It appeared relatively recently and is designed for screens with a very fine pixel pitch. This technology allows us to achieve a much higher pixel density per unit area.
The brightness of an LED screen is measured in nits (or cd/m²).
For a screen installed in a hallway, 600 nits of brightness may be sufficient. An exhibition, show or concert may require higher brightness. For a television studio, on the other hand, you may need to lower the brightness. The advantage of SMD-type screens is that when the brightness decreases, the color gamut remains the same.
For an outdoor LED screen, the brightness should be at least 2000 nits. To ensure readability in direct sunlight – at least 5000 nits. Some DIP models reach 12,000 nits of brightness, which improves their visibility from a distance – this is critical if the screen is viewed from afar. In this case, the brighter the screen, the higher the audience coverage. It is also important that the ice screen can reduce brightness as dusk approaches automatically.
LED screen resolution.
When talking about screen resolution, the term “Pixel Pitch” is use (P3, P4, P6 …. P25).
Pixel pitch is the distance between the centers of adjacent pixels (groups of LEDs or SMD diodes). The smaller the pixel pitch, the denser the LEDs are located, the higher the screen resolution, the shorter the comfortable viewing distance. The pixel pitch is usually denot the Latin letter “P” + a certain value. For example, P6 means a screen with a pixel pitch of 6 mm. The minimum pixel pitch for LED screens at the time of writing is 1.6 mm, which allows you to get full HD resolution on a screen just over 3 meters wide. The maximum pixel pitch for serial screens is 50 mm; its use in translucent screens to create large-area media facades.
Pixel pitch, or resolution, is one of the most important characteristics when choosing an LED screen. It greatly influences the cost and the viewer’s perception of the screen. It is important to choose the optimal pixel pitch so as not to overpay for pixels that no one will see, and at the same time provide the best image quality for viewers and advertisers.
What pixel pitch do you need?
You can roughly estimate it as follows. The pixel pitch is directly proportional to the comfortable viewing distance. In other words, a screen with a pitch of 16mm (P16) is most comfortable to view from a distance of 16 meters.
- From 10 meters it is already possible to distinguish individual pixels – the image will not be uniform, but as if consisting of dots.
- From 50 meters, on the contrary, you will not be able to distinguish small details, and such resolution will be unnecessary.
Therefore, to select the optimal pixel pitch, you first need to assess from what distance the majority of your audience will look at the LEYARD SMD Screen. If from 25 meters and further – it doesn’t make sense to overpay for a 10mm pitch – you need a screen with a pitch of P25 or more.
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