F.A.Q.s


THE ANSWERS YOU ARE LOOKING FOR

QUESTIONS

Is it possibile to purchase a Custom Size giant screen?
Is it possible to visualize a Video on the LED display?
Can variable message led signs read GIF images?
Can you see the images on both sides of a led screen?
What are the differences between Indoor and Oudoor led walls?
What's the difference among screens with same dimension but different pitch?
What is the difference bertween SMD and PTH LEDs?
Does LED really have a lifespan of 11 years (100.000 hours)?
Do you need a permission from the City Hall for a led billboard?
Do you need a permission from the City Hall for a pharmacy cross?
How much does a led giant screen costs?
How much is the led energy consumption?
What are the minimum and maximum Viewing Distances of a LED giant screen?
What are the Color Levels?
What is a LED?
What is a Pixel?
What is the 16 bit Technology?
What is the Carring Structure of a LEDwall?
What is the Color Temperature and why is it important?
What is the Contrast level of a led billboard?
What is the Definition of a LED display?
What is the IP rate (acronym of ingress protection) and what does it measure?
What is the Modular System?
What is the Pitch (or “dot pitch” or “pixel pitch”)?
What is a led screen Refresh Rate and why is important?
What is the Resolution of a led display?
What is the Viewing Angle of a led wall?
What is the Virtual Pixel Technology?
What is Variable Message Sign or VMS?
Where can I find the Spare Parts for my led screen?
Why is the Pure White created with LEDs of 3 colors?

Is it possibile to purchase a Custom Size giant screen?

Of course, yes. Thanks to the Euro Display’s modular design and state-of-the-art technology, there are no limits in shape, dimensions and definition. The only difference is the cost. That is the reason why Euro Display always suggests its customers to optimize the screen’s size following the recommendations of our technical department.

Is it possible to visualize a Video on the LED display?

Of course yes. LED displays have their main application field in the live video visualization during concerts, sports events and TV shows (only later such an advanced technology entered the advertising field too). For the video visualization it is important to be aware of the fact that, to obtain a satisfactory quality of the images, it is necessary to utilize a display with a minimum resolution of 192 x 128 pixels. Euro Display’s digital billboards function as huge monitors and they are able to visualize in real-time anything is visualized on the PC monitor, from the mouse cursor to a video downloaded from internet, from the icons on the desktop to a DVD or a live performance.

Can variable message led signs read GIF images?

No. Alphanumerical signs can visualize text, numbers and several pre-edited icons. Some models are provided with a simple graphic editor that allows you to create your own customized icons. In order to visualize fixed and moving images, the best product is a LED screen.

Can you see the images on both sides of a led screen?

Not on a single screen. On electronic billboards, LEDs are mounted on a support called printed circuit and they are fixed on one single side. To see the images on both sides it is necessary to have two screens, standing one against the other by the rear side.

What are the differences between Indoor and Oudoor led walls?

From a general point of view the difference between indoor and outdoor screens are the following:

  1. Resolution: as the outdoor screens are usually watched from greater distances, they do not need the highest resolution (from great distance the human eye do not discriminate small details anyways). The cost due to the big dimensions is therefore compensated by the lower resolution needed to provide a good image quality.
  2. IP level and cooling system: outdoor screens are treated with a particular “tropicalization” technique that grants an excellent resistance to water, salty air and corrosive intrusions typical of the outdoor installations. Moreover a particular forced-ventilation system guarantees that the temperature inside the module remains constant and does not pass the critical levels.
  3. Against-sun and against-vandalism protection system: outdoor LED billboards are provided of a special protection system that has the double function of protecting the screens from the sun (increasing the contrast levels and obtaining a better image) and from vandalism acts.
  4. Brightness: the outdoor usage requires high brightness components in order to be visible from greater distances and most of all to contrast the direct sunlight.

What's the difference among screens with same dimension but different pitch?

The difference is the optimal viewing distance. The LED maxi screen with an higher definition (therefore a the smaller pitch and a greater number of LEDs per m2) has an higher image’s quality, ideal even for short viewing distance. The screen with a lower definition (therefore with a bigger pitch and a smaller number of LEDs per m2) has a lower image’s quality, ideal for greater viewing distance.
It is important to clarify that the definition is determined by the LED screen’s viewing distance once it will be installed: if a maxi screen will be observed from 300 meters, it doesn’t need an high definition because of a biological reason: the human eye can not discriminate small details from larger distances anyways. On the other side, a maxi screen observed from 30 meters needs a higher definition because from such a short distance the human eye is able to recognize even small details.
To provide a comparison, in the table below are represented two hypothetical screens of the same dimensions but with different definition: the first (fig. 1) has a higher definition and is therefore ideal even for short viewing distances. The second one (fig. 2) has a lower definition and it is ideal for greater viewing distances. To better understand the “viewing distance” concept, please look at the pictures from few centimeters and then from 3 meters: even if the images have a different definition, if observed from 3 meters distance, they seem to have the same quality.

What is the difference bertween SMD and PTH LEDs?

SMD is the acronym of Surface Mounting Device and it is the new frontier of the electronic visualization technology: the revolution created by the SMD technology is represented by the miniaturization of all the electronic components, LEDs included. The SMD components are mounted on the surface of the electronic board, without passing through it as any other electronic component utilizing the former technology, called PHT (acronym of “Plating Through Holes”).
The SMD TOP LED is therefore mounted on the external part of the board (without the anode and cathode passing through holes), as described in the image below (proportions are real): LEDs utilizing the SMD technology are different from the PHT LEDs for another important characteristic: thanks to the miniaturization indeed it is possible to put 3 LEDs of different colors within the same case (as in the picture on the top-right), resulting in a three colors LED.
The possibility to visualize three colors at the same time (Red, Green and Blue) on a single LED allow to create digital billboards with an even smaller pitch (the distance between pixels) therefore resulting in a higher resolution and quality image.

Does LED really have a lifespan of 11 years (100.000 hours)?

To guarantee 100.000 hours lifetime, LED producers state clearly two fundamental conditions that must be met, the internal temperature and the power intensity. These measures have different values depending on LED type, but to provide a limit of comparison we can say that:

  1. the LED internal temperature must be below 120 °C (measured in a 25°C environment)
  2. the power must be below 20 mA If both these conditions are met, the LED producer guarantees that after 100.000 hours (about 11 years always turned on) the LED brightness will be reduced by 50% of the initial value.
Being aware of the importance of these parameters, during the years Euro Display invested in technological solutions able to manage automatically and keep constant both these values with a series of devices and controls as:
  1. a special forced ventilation electronic system,
  2. specific chip that manage every single LED,
  3. a special system of heat sinks.

Do you need a permission from the City Hall for a led billboard?

Most probably, yes. In most of the European and American countries though, its not difficult to get this permission. In most cases it is enough to present a plan for the installation of the electronic billboard (taking into account the environmental impact) and simply paying the related "public installation" fee which is usually paid yearly.

Do you need a permission from the City Hall for a pharmacy cross?

Most probably, yes. But in most cases if you already have a normal pharmacy cross (a neon or a unlit one) you already have the required permission.

How much does a led giant screen costs?

The final cost of a LED billboard depends on two main factors:

  •     The resolution (meaning the total number of LEDs present on each square meter)
  •     The size of the maxi screen (meaning the number of square meters needed to create the screen)

Because of the great variability of both these factors depending on the customer's needs, it is impossible to determine in advance the cost of a LED maxi screen. To provide a term of comparison though, we can say that the PRICE OF EACH SQUARE METER of a maxi screen, is included between the cost of a scooter and a the cost of a powerful motorbike, depending on the resolution required.

As a consequence, the total cost of a maxi screen can be calculated multipling the cost of a single square meter by the total number of square meters needed.

In the LED video wall field, usually the bigger is the screen, the better: big size maxi screens have a higher number of vertical and horizontal pixels. Higher is the number of pixels available, higher is the screen's definition and therefore better is the image quality. Obviously, the larger the screen the greater the cost.

How much is the led energy consumption?

The LED consumption depends on the Manufacturer, on the color and on the power that we supply to the diode. As indication we can say that a LED consumption is between 15 and 100 ma (milliampere) and its power can vary from 0,1 and 1 Watt.

What are the MINIMUM and MAXIMUM viewing distances of a LED giant screen?

The minimum and maximum viewing distances of a LED screen are measured depending on two fundamental characteristics of the screen: the pixel pitch and the screen’s dimension.

  1. the minimum distance is calculated converting into meters the pixel pitch. For example, a maxi screen with 10mm pitch has a minimum viewing distance of 10 meters, while a 20mm pitch screen has a minimum viewing distance of 20 meters.
  2. the maximum distance instead, depends on the screen’s dimension and it can be calculated multiplying x10 and converting into meters the number of maxi-screen’s square meters. For example a 4x3 meters (=12sq) can be viewed from 120 meters distance.

While talking about maximum distance, there are two concepts to clarify, “readability” and “visibility”. “Readability” identifies the distance within the images broadcasted on the maxi screen are readable, thus clearly recognizable. “Visibility” identifies the distance within the images showed are able to attract the human eye’s attention, even if the images are not perfectly identifiable. The visibility of a digital billboard is usually the double of its readability (in our former example: readability 120 meters = visibility 240 meters). Regarding the written texts, the readability depends on the fonts’ size.
Generally, it is possible to say that every centimeter can be read from about 5-meter distance. For example, 10 cms texts can be read from about 50 meters.

What are the Color Levels?

Color’s levels are the touches that any color can have. In the LED visualization field are kept into consideration the color’s levels of the three primary colors: Red, Green and Blue. The number of color’s levels define the number of touches needed to pass from the lowest level (turned off) to the highest (lighted at maximum power). It is obvious that higher are the number of touches available, higher is the quality and the naturalness of the visualized image.

What is a LED?

LED is the acronym of Light Emitting Diode and it is a semiconductor that emits visible light when electricity pass through it. The emission of light depends on electrons flowing between anode and cathode and the color of the visual emission (that can be Red, Green, Blue, Amber, White…) depends on the material utilized.

What is a Pixel?

By definition, the pixel is the “luminous dot” present on every LED device, from the simple alphanumerical Single Line display to FullColor maxi screens. This luminous dot can be formed by 1 or more LEDs depending on dimensions and features of the device. For example, on a small-size Single Line display, the pixel is formed by 1 single LED while on the king-size model the pixel can be formed by 20 LEDs. In some products, the pixel can be composed by up to 36 LEDs.

What is the 16 bit Technology?

Displays utilizing a 8 bit technology, that degrades the image during the video elaboration phase, are able to visualize 256 color’s levels for each of the three primary colors. This means that are able to visualize 256 x 256 x 256 = 16,8 millions colors in total. Euro Display’s maxi-screens instead utilize a 16 bit technology for each color that allows to manage the video without altering the quality in a perceptible way (so the human eye does not notice it). After this elaboration (called Gamma Correction) it is possible to visualize 65.000 color’s levels for each of the three primary colors. This means that it is possible to visualize on your electronic billboard 65.000 x 65.000 x 65.000 = 280 trillions colors in total.

What is the Carring Structure of a LEDwall?

LED billboards are installed with different carrying structure depending on the applications. They can be installed on:

  • truck
  • on the side of a building or structure
  • on streestanding feet
  • on a pole
  • on goal post structure
  • hanging (for indoor applications)

What is the Color Temperature and why is it important?

As an international convention defined by the CIE (International Commission of Illumination) states, while evaluating the properties of any source of light, it is used a measure that it takes into account their chromatic content. Such measure of reference is called “color’s temperature” and it is expressed in Kelvin degrees (°K).
Low levels of color’s temperature correspond to color’s tones stretching out to the red, while high levels correspond to color’s tones stretching out to the blue. In LED maxi-screen is fundamental to keep constant this measure to visualize high quality and naturalness pictures. Euro Display’s LED video walls are provided with an electronic system of colors’ equalization that manage these parameters automatically, depending on the environmental brightness, in order to obtain always a constant color’s temperature both at days and nights.

What is the Contrast level of a led billboard?

It’s the difference between the light emitted by the display and the environmental light reflected by the screen’s surface. Minor is the light reflected, higher is the contrast and therefore the cleanliness and naturalness of the images. To increase the contrast Euro Display’s LED screens are provided with particular anti-reflex flyers that split the light and reflect it in different directions, increasing the visibility of the screen even in direct Sun light.

What is the Definition of a LED display?

The “definition” is the number of vertical and horizontal pixels that are on the entire digital billboard. For example, some standard definitions are 96x64 pixels (=low definition); 256x192 pixels (=medium definition): 640x480 pixels (=high definition). The definition is therefore related to the pixel pitch, the distance between the pixels.
To simplify and clarify the terminology, it is possible to say that the RESOLUTION is referred to the single module, while the DEFINITION is referred to the entire screen, once that all modules have been mounted.

What is the IP rate (acronym of ingress protection) and what does it measure?

The IP rate identifies the Ingress Protection against humidity and dust. The IP level is described by 2 two figures: the first one is referred to the protection level against dust, the second against water. The Ingress Protection level is an international standard and it is utilized to measure the waterproof ness of any electronic products. Devices with a higher IP level keep the internal components safe and clean.
Euro Display’s electronic billboards guarantee a IP65, the highest reachable in the LED visualization field. In the table below are summarized the different IP levels and their description.

What is the Modular System?

It is a system that allows to build LED billboards of big dimensions mounting together several base-modules, depending on thee customer’s specific needs. Euro Display’s base modules have different sizes, depending on the application.
These modules are fixed together with a Dual-Lock system and the perfect alignment of the pixels is guaranteed by an auto-centering system that avoids the awful conjunction lines. Euro Display’s modular system offer huge vantages: it allows an easy transportation and a simple mounting procedure, it permits an easy maintenance, doesn’t put any limit in shape, size and resolution and moreover allows the future upgradeability of the LED video wall.

What is the Pitch (or “dot pitch” or “pixel pitch”)?

The pitch of a LED screen defines the distance between the pixels, expressed in millimeters. This fundamental measure determines the characteristics and the performances of a LED maxi screens: the pitch indeed is a defining factor of a screen’s viewing distance:

  1. The smaller is the pitch, the shorter is the minimum viewing distance, the higher is the total number of pixels present on the screen (and therefore higher is the screen’s cost per area).
  2. The bigger is the pitch, the longer is the minimum viewing distance, the lower is the total number of pixels present on the digital billboard (and therefore lower is the screen’s cost per area) The pixel pitch therefore determines the LEDs density, which is usually called Resolution. It is important to notice that while reducing the pixel pitch, the LED density increase exponentially: for example, reducing the pitch by the 50% on the number of pixels grow of 4 times.

What is a led screen Refresh Rate and why is important?

The refresh rate indicates the number of times that the image refreshes every second. For example, a PC monitor has a refresh rate of 72 Hertz (Hz) and therefore refresh all the pixels of the electronic billboard, from top to bottom, 72 times every second. The refresh rate is fundamental because determines the image’s quality: if it is too low, the human eye can see a flicker that causes headache and eye’s damages.
To provide a comparison, most of the TV monitors have a refresh rate of 50Hz and only few products of the last generation have a 100Hz refresh rate. Euro Display’s screens have a 240 Hz refresh rate, which is almost triple of the most advanced cathode tube technologies. This measure is ulterior prove of Euro Displays’ quality and state-of-the-art technology, result of years of research in the laboratories and on the field.

What is the Resolution of a led display?

The resolution is nothing else but the number of pixels present on each square meter. The resolution is therefore opposite proportional to the pixel pitch: smaller is the distance between two pixels, higher is the resolution (because on the surface of the LED billboard is present an higher number of LEDs).
For example a 20 mm pitch screen has a resolution of 2304 pixels: this measure is obtained dividing the total length of a single module (975 mm) by the pixel pitch (in this case 20 mm) resulting in the number of pixels on a single line: 975:20 = 48 pixels. Multiplying the number of pixels present on a single line by the total number of lines the result is the total number of pixels present on the screen’s surface, also called Resolution. In our example, 48 x 48 = 2304 pixel in total. Given this formula, it is possible to calculate that a 30 mm pitch screen has a resolution of 1024 pixel per module, while a 10 mm pitch screen has a resolution of 9216 pixels per module. It is important to notice that reducing of only few millimeters the pixel pitch, the LED density (and therefore the resolution) increase exponentially.
Remember: Smaller is the pitch » Shorter is the minimum viewing distance » Higher is the total number of pixels present on the LED video wall » Higher is the quality image » Higher is the screen’s cost per area.

What is the Viewing Angle of a led wall?

The visibility angle of a screen is by convention the angle within which the brightness of a display is equal to the 50% of the frontal luminosity.
For example, a LED screen with 5000 NIT frontal luminosity (NIT = millicandels/sq) has a visibility angle equal to the angle by which the brightness is reduced to 2500 NIT. This visibility angle can vary depending on the LED and the technical features of the display.

What is the Virtual Pixel Technology?

The Virtual Pixel is a technology of image management that allows visualizing pictures of a definition higher than the physical one, thanks to a technique called “pixel interpolation”. Euro Display’s Virtual Pixel technology is able to control every single LED: this particular and exclusive screen management feature allows overlying every single pixel to the next one, creating a so-called “virtual pixel” (a pixel that does not exist but is perceptible by the human eye).
The digital billboard’s definition is one of the characteristics that define images’ quality and naturalness: higher is the resolution, higher is the picture’s quality. Euro Display’s maxi-screens with virtual pixel technology can visualize images with a definition four times higher than the physical definition of the display; therefore, images are more detailed and realistic.

What is Variable Message Sign or VMS?

LED Displays, Digital Signage, Dynamic Displays, electronic billboards are all different names for the VMS (Variable Message Signs). VMS are generally used to broadcast visual communications (messages) consisting of text, graphics, video and/or audio.

Where can I find the Spare Parts for my led screen?

For each LED billboard, Euro Display provides a number of spare parts sufficient to cover the ageing due to the normal usage, without any cost for the customer. Moreover, if it is the case, any reparation made within the warranty period will be totally free.

Why is the Pure White created with LEDs of 3 colors?

Because the human eye has three types of receptors for the vision during the day and each one of them correspond to a primary color. Any other color is the result of the simultaneous stimulation of these three types of receptors, after a phenomenon called addition synthesis (that mix the chromatic components captured by the eye). The mix of the three primary colors, in different percentages, therefore generates each color. The color of reference, the pure white, is obtainable mixing the primary colors in the percentage of about 50% green, 30% red and 20% blue Euro Display’s technology allows, varying these values, to obtain 280 billion colors. This huge palette is guarantee of a superior image quality and unbeatable visualization capacity.

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