With the complexity and price of LED displays, you need a partner with strong expertise and experience. Ad Art has made it our mission to equip our clients and resellers with the requisite information in order to make and informed decision regarding the technology, and substantial benefits of LED signs.

 

Ad Art sets itself apart because we see it as our duty to educate the customer. The Ad Art LED Academy is constantly updated with new products and offers continuous education programs.

 

 

 

 

Components

 

 

LED

 

LED

A light-emitting diode (LED) is a semiconductor device that illuminates when electricity passes through it. While LEDs contain an anode and cathode, they do not contain filaments like regular light bulbs. Accordingly, they do not have delicate parts that break or burn out over time. Industry standard LEDs are rated at 100,000 hours (11+ years) of constant use.

The Ad Art Difference
Ad Art sources and matches only use the highest quality LEDs that meet our stringent Quality Control guidelines for output uniformity, brightness, color and lifespan.

 

 

 

 

 

 

ControllerController

An LED controller is the “brain” of the LED display. In reality, the controller is merely a industrial-rated pc with high temperature tolerances for extended use. The LED display controller contains a Sending Card (see below) which serves as the interface between the PC and the LED display. Ad Art LED Display controllers come pre-loaded & pre-configured with the Scala player application.

The Ad Art Difference
Our StadiaVision and ArenaVision LED displays include powerful and rugged PCs for maximum performance and                                                                                                                longevity.

 

 

 

 

LED moduleLED Module

 An LED module is the smallest common denominator in building an LED display. A single LED module contains several rows and columns of pixels (typically 8×16, 16×16, 20×20, 32×32). The LED modules are assembled into watertight cabinets which when assembled together edge-to-edge on a frame form an LED display.                                                                                                                                                                                                                                                                                                                                      The Ad Art Difference                                                                                                                                                                            Most of our modules conform to certain size standards (320mm x 320mm) and can be upgraded, along with the power supplies, to a higher pixel pitch module at a later time for increased resolution.

 

 

 

 

 

LED CabinetLED Cabinet

An LED cabinet is the waterproof metal enclosure that contains a group of modules, power supplies and a receiver card. Typically, these sections are about 10 square feet in area depending on the modules size. This critical structure protects the sensitive electronics inside from weather intrusion, debris and vandalism. Ad Art’s LED cabinets have IP65 ratings for ingress protection.

 

The Ad Art Difference
Our all cabinets are UL or ETL listed for safety.

 

 

 

 

 

 

Power supply

Power Supply

A device that converts incoming AC power (120-240 volts) to the correct voltage DC power, and distributes it to electronic components. Several power supplies are typically required per LED display, with the number dependent on the size of the display.

 

The Ad Art Difference
Ad Art uses Mean Well brand units; the industry leader in high quality power supplies.

 

 

 

 

 

light sensorLight Sensor

A device that detects the ambient light levels around the LED display, and adjust the display’s brightness accordingly. This prevents the sign from being too dim in the daytime, and too bright at night.

 

The Ad Art Difference
All of our light sensors undergo thorough testing at third-party facilities.

 

 

 

 

 

receiver card

 Receiver Card

A receiver card converts the digital video stream from the LED controller sender card over a single CAT6 cable. Each receiver card is factory programmed to captures a specific pixel area of the entire display and output to the modules contained within its cabinet. The signal stream is relayed, via CAT 6, to the next LED receiver card down to the last card in the display face.

 

The Ad Art Difference
All of our receiver cards undergo thorough testing at third-party facilities.

 

 

 

 

sender card

 

Sender Card

The sender card takes captures the desktop of the controller PC, typically from the PC’s HDMI or DVI input, and broadcasts the stream to the receiver cards that make up a portion of the display. There is typically a single sender card per display with exception of very large displays which contain more pixels than an High Definition (1080) monitor.

 

The Ad Art Difference
All of our sender cards undergo thorough testing at third-party facilities.

 

 

 

 

 

 

Definitions

 

 

 

LED Display    An LED display is a variable message center utilizing Light Emitting Diode Technology, LED displays can be single or double-sided, single color or full color, and come in many sizes.

 

Pixel    A pixel is a point of light usually mapped to a specified X/Y coordinate. An LED display is made up of an array of pixels, which together form a graphic output device. These pixels light up in different combinations, forming text, images and video clips on the display. A pixel can be as small as one LED or it may contain a cluster of LEDs that act as a unit.

 

Pixel Pitch    The pixel pitch or center-to-center measurement is the distance from the center of one pixel to the center of the adjacent pixel. Pixel pitch is typically measured in millimeters, such as 10mm, 16mm or 20mm.

 

Matrix    The matrix of a sign is the number of pixels vertically by the number of pixels horizontally. For example, if a sign has a matrix of 32×96, this means it has 32 pixels from top to bottom and 96 pixels from left to right. A larger matrix allows more text and more of a graphic to appear on the display at the same time. The matrix may also be referred to as the resolution of the display.

 

Millicandela ( MCD)    A millicandela is a unit of measurement for the brightness of a single LED. A millicandela is equal to 1/1000 of a candela, which is comparable to a single candle’s brightness.

 

Pixel Sharing    This technology allows you to maximize your display through the sharing individual LEDs from adjacent pixels, resulting in a virtual matrix that doubles the matrix height and width and increases the resolution by 400%. Pixel sharing also increases the definition of the display – an LED display with a 20mm pixel pitch has a virtual pixel pitch of 10mm.

This technology enhances graphics, video clips and text by smoothing out the pixilation that can occur with curved lines to make them appear jagged. Text, images and video clips are dramatically improved, increasing the effectiveness and visual appeal of the sign. While a display utilizing pixel sharing will not look as crisp as its true matrix equivalent, when comparing two LED displays with equal dimensions the investment in the virtual matrix option will be 3 to 4 times less!

 

Full Color    A full color display uses a combination of red, green and blue LED light to create any color. Combined with the overall intensity of the full pixel, an enormous range of colors are possible. Our full color displays are capable of showing 281 quintillion different color combinations.

 

Nit    A nit is a unit of measurement for the brightness over one square meter of a display. This value takes into account the number of LEDs per pixel, pixel pitch and millicandelas. Your sign’s nit rating can help you determine which sign is a better value when comparing products and companies.

 

Viewing Angle & Viewing Cone    The viewing angle is the maximum angle that text and images can be seen on a display. A narrow viewing angle causes the text or image to “disappear” from the display as a viewer moves away from a position directly in front of the sign. The viewing cone is simply double the amount of the viewing angle.

 

Master/ Master and Master / Slave Configuration    On a two sided display, the sides can be configured to operate independently or together. In a master/master configuration, the two sides can either show the same message or can show different messages at the same time. In a master/slave configuration, one side always sends a signal to the other; resulting in the same message on both sides.

 

Grayscale    A grayscale display only shows shades of a certain color, usually red. Our grayscale displays show 4,096 shades, far exceeding the industry average. With two LEDs per pixel for most modules, our grayscale displays are typically brighter as well.

 

 

 

Why Does Brightness Matter

 

 

 

There are two important things to consider related to sign brightness: how well and how long it will compete with the sun. Our LEDs are among the brightest available to provide you with a sign that will be visible 24 hours a day for years into the future.

 

How well a sign competes with the sun.

Ensuring that your sign is readable during the day is vital to the success of having passers by read your sign. The brighter the display, the better able it is to compete with the sun.

 

How long a sign competes with the sun.

LEDs do not burn out, however they do grow dimmer with use. The closer an LED gets to 1500MCD, the less effective it is at competing with the sun. Starting with a brighter display ensures that your investment will be readable for many years into the future.

 

 

 

How to Choose a Size

 

 

One of the most important decisions when purchasing an LED sign is its size. Size can be influenced by several factors including distance from the road, the speed of traffic and other considerations. We recommend that you speak with an Ad Art representative to gain a full understanding of how a size should be selected.

 

 

 

 

 

Optimizing LED Graphics

 

LED signs are amazing pieces of technology. They are capable of showing text, images, animations and video visible from far away and under harsh outdoor conditions. Despite this, all LEDs have limits when it comes to the amount of detail they can display.

The reason for this limitation has to do with the number of pixels, or points of light, that make up the display. Each pixel is controlled as either on or off – and in some LED signs, each pixel can produce different levels of light output. The difference in light output is what creates a three dimensional image on the display itself. Text messages education_optimizing_exampletransmitted dir
ectly onto a sign are typically using pixels that are either on or off to make up each character in the message itself.Pixels are arranged in rows that go across the length of the display,
and columns that go up/down the height of the display. This forms the pixel matrix, typically written as height by width. For example, a 32×128 pixel display is 32 pixels high and 128 pixels wide, for a total of 4096 pixels.Commonly, only display height in pixels is used for comparison purposes. This is because the height is typically smaller than the width, and is therefore more of a deciding factor for display capabilities. LEDs are typically presented longer rather than taller so that the user has the option to include text messages from left to right on the display.
A typical LED display may be between 32 and 96 pixels in height. In comparison, high definition TV is 1080 pixels high and a 5 mega-pixel image is 1920 pixels high.

Clearly, this amount of detail connot be replicated on an LED display. So how does someone take their won image or video and make it look good on their sign? The answer is to find an optimal way to change its size to fit the display. When it comes to placing an image or video onto an LED display, there are three ways to make it fit:
    • Resizing ( shrinking the image or video to fit on the display)
    • Cropping ( selecting only a portion of the image or video to be displayed)
    • A combination of the two

We will be using this example image that is currently 250 pixels high by 400 pixels wide. It is in color, but the following instructions also apply to red or amber displays. They also apply equally to   video as well as images.


 

Resizing

 

The least desirable way to put an image or video on your display is to simply resize it. In essence, you are combining many pixels into one, resulting in a loss of detail. The larger the original image, the more pixels that need to be combined to fit onto the available LED matrix. Here we see our example image (which is 250 pixels high by 400 pixels wide) resized for a 32×128 display matrix.

 

education_optimizing_resizing

 

You will notice two differences from the original image. The first is that the image is how pixilated, meaning that the individual pixels that make up the image are now visible. Pixilation is  unavoidable on an LED display due to the limited number of pixels available. However the gradation, or difference in color between adjacent pixels, plays a large part in making the image look good. we will see this in the next example.

The second difference is that the aspect ratio of the image has changed, making the image look “stretched.”. This is because the height had to be reduced almost twice as much as the width to make the original image fit into 32 by 128 pixels.

 

Cropping

education_optimizing_cropping

 

A more acceptable way of fitting an image to a display is to crop it. This simply means selecting a 32 by 128 pixel area in our original image and removing the rest. Here we see our example image cropped to 32 by 128.

The negative to this approach is that only a very small area of the original image could be used. However, you will notice that the image still maintains its original aspect ratio ( it doesn’t look “stretched” or ” scrunched”), and that the smooth gradation makes the image look much better. Try viewing the large examples at a distance to see the difference.

 

 

Resizing and Cropping

 

education_optimizing_both

 

The best approach is to find a middle ground that gives us some of the benefits of both. This is done by resizing the image first ( to something larger than the display and without changing the original aspect ratio) and then cropping, or by performing both simultaneously. Here we see our example image that has been both resized and cropped.

Here we have resized the image to include more of the subject, but have also cropped to reduce the amount of detail. The result is an image that will look good on the display.

 

 

Choosing the Right Image or Video

 

education_optimizing_choosing

 

While these tips can be used for any image or video, starting with the right one can make things much easier. Choose subjects that do not contain a lot of detail and have a smooth gradation of shades or color.

Images or video that start with a high amount of detail will have many adjacent pixels combined into one, resulting in a loss of clarity of the original subject.