Basketball Perimeter LED display
Humanistic, athlete protected Basketball Perimeter LED display is one of the most high end application of our products which is widely used for various Basketball matches. ERALED Basketball Perimeter LED display is also available in fixed and rental application and realizes the most multi-functional multiple use purpose.
Basketball Perimeter LED display is normally very long in length and short in height. The most typical length of the large Basketball Perimeter LED display is 100-300 meters depending on the size of the sports stadium, meanwhile the most typical height is a more or less 0.8meter-1.28meters . The available pixel pitch is 10mm, 8mm, 6.67mm, 6mm, 5mm, 4mm and 3mm pixel pitch depending on the resolution requirement. The most hot selling Basketball Perimeter LED display model is energy saving P10mm with 1/2 scanning method, high fresh frequency driving IC, high brightness gold wires LED lamps, soft top cover and soft mask for protecting the player, angle adjustable mounting legs for adjusting the viewing angle, waterproof PLC power distribution box, dual power and data backup system, etc. Meanwhile the old conventional P12mm, P16mm and P20mm is washed out from the market step by step since customer need higher and higher resolution to improve the image quality. Furthermore, the Basketball Perimeter LED display need to be able to use as rental LED display or fixed installation LED display to create more advertising or renting revenues since for many sports stadium, there's only very few sports
0events each year. Which means the Basketball Perimeter LED display is just using in the stadium for very limited time which may be less than 10-20 days per year. So during the time which there's no sports event, the sports stadium LED display also should have the capability to be used as moveable rental use, fixed installation use, etc.
Comparing to other products, the LED display is a long term investment, the amount of the investement also much larger than other products. If your direction is correct, you will get a lot from this investment also. If direction is wrong, then there will also be many more troublesome and headache:-(
In order to maximize the your investment on the Basketball Perimeter LED display, it's really worth to equip with rental moveable equipment and choose a smaller pixel model, like 4mm, 5mm, 6mm, 8mm, 10mm pixel pitch Basketball Perimeter LED display. Then, after the sports event using, you can use our Basketball Perimeter LED display as rental display or for other purpose. In this way, you will get higher revenues and make your ROI time be as short as possible. Your farsighted investment will be proved to be wise in a very short time after the sports event using!
Furthermore, our Basketball Perimeter LED display also have the advantage of Ultra slim and lightweight which is 50% thinner, 40% lighter than conventional iron cabinet, 20% lighter than conventional aluminum cabinet, which will definitely save the cost of assemble disassemble and transportation; Handle detachable and soft cushion protect people from bump injury; Easy and tool-free maintenance, etc:
Everyday thousands of sports games (eg, Basketball game, Football game, Baseball game, Softball game, Hockey game, Soccer game, Tennis game, Track field game, Volleyball game, Wrestling game, Curling game, Motor Sports game, Cricket game, Lacrosse game, Pari-mutuel game, Rodeo game, Squash game, Natatorium game etc.) are being played throughout the world. ERALED is the best manufacturer bringing the ultimate game-day experience to sports games fans everywhere. Our wide variety of Basketball Perimeter LED display showing the details clearly while Basketball Perimeter LED display bring the game to life, giving fans the information and entertainment they crave.
The combination of sports and commercial advertising can be traced back to the late 19th century. The advertising media evolves from athletes to the Basketball Perimeter LED display. The Basketball Perimeter LED display as a specific advertising media is generally used on the giant gymnasium, like Basketball stadium, Basketball stadium, Baseball stadium, Softball stadium, Hockey stadium, Soccer stadium, etc., where full of mass audience. So, to place Basketball Perimeter LED display there is cost-effective. Comparing with the traditional ad. Media, Basketball Perimeter LED display is much more attractive and can show much more advertising information, and it can be cyclic utilization, which make it an absolutely first choice for sports sponsors.
Dual Data & Power hot backup system improving stability:
Dual data and power hot backup system, to avoid any communication risks during the game; ensuring safer and more stable work. Adopt dual backup design of data and power system, when the current using data and power system breaks down, the hot backup data and power system will automatically started to ensure the stable working of display screen, reliable and worry-free;
Wide application and short ROI:
With the easy installation, convenient management and maintenance features, ERALED perimeter saves much more cost for advertisers; "Human-oriented Design" could protect players in 360°. It is widely accepted in numerous world class events such as Basketball match, Football match, Baseball match, Softball match, Hockey match, Soccer match, Tennis match, Track field match, Volleyball match, Wrestling match, Curling match, Motor Sports match, Cricket match, Lacrosse match, Pari-mutuel match, Rodeo match, Squash match, Natatorium match etc,. Besides, ERALED perimeter LED display is also available in fixed and rental installation and realizes most multi-functional multiple use purpose.
ERALED Basketball Perimeter LED display show continuous advertising messages on the Basketball Perimeter LED display across the entire perimeter of a sports stadium. Our Basketball Perimeter LED display for Basketball, basketball stadiums are convenient to install and disassemble. With external signal and power sockets our Basketball Perimeter LED display also include interlocking systems.
Front surface to protect athletes from injuries; Top part with a special Player protected Soft Cushion Design: Special soft Cushion design, even by external attack, it can protect the player's safety. Angled LED configuration with tilted foot system for multiple setup scenarios, striking a perfect balance between live audiences and broadcast camera. Multiple uses as both perimeter system and commercial display when stacked.
High resolution with perfect display performance, new generation UHD LED display technology, the pixel pitch is as small as 3mm which is the world smallest pixel pitch outdoor waterproof Basketball Perimeter LED display.
EMC, TUV-EMC approval:
Totally meets UEFA stadium standard requirement, TUV-EMC certificated, widely used in one of the five top world Basketball League
High Contrast, High Frequency and high Color Capacity:
Stadium LED display need very high fresh frequency since it 4800: 1 Contrast Ratio- a very high level to ensure a vivid image of our LED displays system. 4800HZ High Frequency- a very high level to ensure a non-flicking video rebroadcasting and ideally for live event broadcasting.
16 bit, 281 trillion color Capacity-a very high gray grade to create a vivid live video effect. Stadium LED display's viewing distance is normally much shorter than the large fixed permanent installation LED display. So, the only way to improve the viewing distance and video quality is improving the Stadium LED display's resolution and, the contract, frequency and gray grade.
60% Energy saving:
Energy saving Stadium LED display use less electricity, less oil, less money spent, less operation fee and higher profit, shorter ROI time. Energy saving also means low power consumption, low heat generation, much longer lifetime, long lifetime high brightness and low failure pixels.
First-class LED chip:
Supplied by Next-generation Nichia LED from Japan, CREE LED from USA, Nationstar LED from China best LED Stock Listed Company to ensure high brightness, uniform colors and the long lifetime our LED display system.
Sun-Cutting Long-term high Calibrated Brightness and Brightness:
9000 nits brightness capacity creating the only true daylight viewable solution, ensuring Clear vivid image quality even in direct, full-on sunlight to ensure you attracts more audience to get short ROI of your LED display's investment. Featuring high brightness, wide viewing angles and stunning video quality, Basketball Perimeter LED display application is specially designed for exceptional performance in large sports arenas. The extreme durability and new safety features enable ERALED's Basketball Perimeter LED display appear to most famous sport arenas worldwide. This state-of-the-art Basketball Perimeter LED display also boasts a modular, lightweight design with an adjustable stand, creating it even more flexible.
Easy Installation, operation, servicing and easily transportable:
Special fast lock design guarantees quick & easy installation, only need 20 second to complete the installation of one cabinet. Easy and simple installation interface and user friendly software to ensure the user friendly interface of the LED display system. Easily transportable display system with a quick and easy setup;
Seamless splicing after Compact CNC processing, high precision die-casting cabinet achieves high flatness and seamless matching of the whole display.
Adjustable cabinet angle:
0-30 °Adjustable cabinet angle to ensure the widest possible viewing spot for TV cameras and the viewers of the live audience.
Other Unique designs:
Fast cooling: excellent heat dissipation performance to protect the module circuit
Anti-interference: Special anti-electromagnetic interference function
High stability and reliability prolong the lifespan of LED display.
Anti-collision beam and soft louvers design, protect athletes from crashing
Unique base rack design, effectively prevents water accumulation on the display
Extra wide viewing angle of 160° for exceptional picture quality under all circumstances.
Independent ground support structure, more stable than you think: Adjustable independent ground support structure, even by external attack, still no problem.
Rear service in 30 seconds, faster and more convenient: It only takes 30 seconds to take place one module from the rear side, simple and easy.
Modular design, simple maintenance: Modular design of the module and cabinet frame simplifies the complex wiring, ensure the fast maintenance, taking place one module in a very short time.
Strong stability and reliability
Accurate precision calibration
High protection grade
Super Slim: 30% thinner than conventional aluminum cabinet
Super lightweight: 40% lighter than conventional aluminum cabinet
Basketball Perimeter LED display Technical parameter
LED lamp's encapsulationtype
Module Total Resolution(L×H)(unit: pixel)
Module Total Dimension(L×H)(unit: mm)
Cabinet Total Dimension(L×H)(unit: mm)
1.Concept or define of the LED chip: LED chip is a semiconductor which can converts electric energy into visible light. The chemical compound used within an LED determines its color, brightness and power efficiency.
2.Concept or define of LED lamps: LED is short for 3 words: Light Emitting Diode
According to the LED chip's encapsulation type, LED lamps have several different types, like:
SMD(Surface Mountinging Device), DIP(Dual In Line package),Dot matrix, etc.
Generally speacking the LED lamps come in two basic forms:SMD and DIP.
SMD LED display is more and more popular since the Advantages of perfect: color blending capability, no color shift at extreme angles, much wider viewing angle comparing to DIP. More important reason why SMD is more popular is the resolution of SMD LED display is much higher than DIP LED display. For example, the smallest pixel for DIP LED display is 10mm. However, the smallest pixel pitch for SMD LED display is 3.2mm which means 9 times resolution higher than DIP LED displays. Furthermore, the SMD LED display is more energy saving and cost is also lower than DIP LED display
Acoording to the SMD LED's encapsulation size, SMD LED can be classified to several models, like: 0606 SMD,0808 SMD,0909 SMD,1010 SMD,1515 SMD, 2020 SMD,2121 SMD,3528 SMD,1921 SMD,2525 SMD,2727 SMD,3535 SMD,5050 SMD etc
SMD 1921, 2525, 2727, 3535, 5050 is used for outdoor waterproof models, others is used for indoor non-waterproof models.
Acoording to the SMD LED's encapsulation color:, SMD LED can be classified to Black LED lamps and white LEDs.
SMD Black LED lamps:
SMD white LED lamps:
Black SMD is 50% lower brightness, but can be viewed more clearly under the sunshine because the contrast ratio is higher, gray grade is higher as you can see from the below 2 SMD white LED display and SMD Black LED display's actual comparison under the sunshine condition. Below picture to show: left is white SMD LED display, right is total black SMD LED display:
Each SMD LED lamp contains red, green and blue LED chip, meanwhile each DIP LED lamps only contains one color LED chip of either red color LED chip, green color LED chip or blue color LED chip.
Dual In Line LED lamps
Dual In Line LED lamps use a reflector cup and an epoxy lens package with dual legs, that is why it's called DIP. This combination as well as the type of chip used, plays a role in determining the elliptical viewing angle produced. A Dual In Line LED's reflector cup focuses the light emitted by the chip into a specific viewing area.
DIP LED display is very popular before the year of 2015, 90% of outdoor full color LED video display were made of DIP LED lamps. However, SMD LED display taking place of the DIP LED lamps rapidly after the year of 2016. Nowadays, 95% of the full color LED display is made of SMD LED lamps.
3.Concept or define of LED pixel: Pixel is short for picture elements, are points of light that illuminate to form letters, words, graphics, animations and video images. One pixel can be made up of a single LED lamp, multiple LED lamps of the same color or multiple LED lamps of different colors. They are the smallest elements of the electronic display system that can be individually controlled and turned off or on at various brightness levels. Pixel is also called dot, is also the most basic and smallest unit of resolution. For example, when we say HD, UHD resolution: normally refers to how many pixels or dots in length and how many pixels or dots in height. HD means the resolution should be 1920 pixels in length, 1080 pixels in height. UHD means the resolution should be 3840 pixels in length, 2160 pixels in height, or even 7680 pixels in length, 4320 pixels in height. LED pixel is also the basic and smallest unit of LED module since each module is composed by a certain amount of LED pixels.
4.Concept or define of pixel pitch: pixel pitch means the distance between the 2 most close neighboring pixels in line and column. For example, if the distance between the 2 closest neighboring pixels in line and column is 8mm and 3mm, then we call this LED display model: pixel pitch Indoor Rental LED display . Pixel Pitch is normally just called PH, or P. So, PH8mm equals to P3mm.
5.Concept or define of LED module: LED module is the basic unit of LED cabinet which were composed by a certain amount of LED pixels.
6.Concept or define of LED cabinet: LED cabinet is basic unit of LED display which were composed by a certain amount of LED modules.
7.Concept or define of LED display: LED display is the final product which were composed by a certain amount of LED cabinets.
8.Concept or define of LED display models: all the LED display products' model is normally classified and defined by the pixel pitch. ERALED display products' Pixel pitch typically ranges from 1.2mm up to 20mm for indoor and outdoor LED displays. Our indoor LED display model list: P1.25mm, P1.562mm, P1.667mm, P1.875mm, P1.923mm, P2.0mm, P2.5mm, P2.88mm, P2.98mm, P3mm, P3.91mm, P8mm, P4.81mm, P5mm, P5.95, P8mm,P6.25mm; Our outdoor LED display model list: P3mm, P3.2mm, P3.338mm,P3.91mm, P8mm, P4.81mm, P5mm, P5.95, P8mm,P6.25mm, P6.8mm, P6.667mm, P8mm, P10mm, P10.68mm, P12mm, P18mm, P20mm.
Pixel pitch directly correlates your display resolution and optimal viewing distance. The smaller the pixel pitch, the higher the pixel density, the higher the resolution, the more pixels used to make up the image on your display, thus improving the resolution and optimal viewing distance. What does this mean in more simple and plain terms? The smaller the pixel pitch, the closer a viewer can stand to your display and still have a very good image quality.
Theoretically speaking, the smaller pixel pitch, the better. However, we are living in the realistic world which have many limitations, especially the resources and money. The smaller pixel pitch LED display always have better image quality, but also increase the cost since the smaller the pixel pitch, the higher the pixel density, the higher the LED lamps quantity needed. Each LED lamps is not so expensive. However, when the pixel pitch is very small, like 1.25mm pixel pitch, each square meter LED display area need 640000 LED lamps which is more than half a million LED lamps. So the cost is also extremely high! So, even 1.25mm pixel pitch indoor LED display and 3.2mm pixel pitch outdoor LED display is the smallest pixel pitch LED display among all models. However, 98% customer still choose other bigger pixel pitch LED display to match their demand and balance their ROI time. For example, using 1.875-8mm pixel pitch indoor LED display and 3.91-10mm pixel pitch outdoor LED display. By having a smaller pixel pitch, you increase the number of LED pixels for your display. The more LED pixels in your display, the higher your expense. You can cut your costs and still have a fantastic display by going with a larger pixel pitch if your audience isn't too close to your screen. If your display is in a space where your target audience will be closer to the display screen, such as in a shopping mall's retail environment, a 1.2-2.5 mm pixel pitch LED display is probably better suited to your needs. If you are hanging your display higher and in turn further from your target, for a project such as airport signage, a 2.5-5mm pixel pitch LED display may be best for you.
9.Concept or define of LED display resolution? LED display resolution is defined by how many pixels or dots in length and how many pixels or dots in height on the physical area of the LED display. HD LED display means the resolution should be 1920 pixels in length, 1080 pixels in height. UHD LED display resolution means the resolution should be 3840 pixels in length, 2160 pixels in height, or even 7680 pixels in length, 4320 pixels in height. Resolution is mainly determined by pixel pitch and LED display size. The smaller the pixel pitch, the higher the resolution; the larger the LED display size, the higher the resolution. So, there's 2 ways to increase the LED display resolution: using smaller pixel pitch technology or increasing the LED display size: When the LED display pixel pitch is certain, then increasing the LED display size to increase the resolution; When the LED display size is certain, then using smaller pixel pitch LED display size to increase the resolution.
10.Concept or define of the viewing distances:Viewing distances are calculated based on the display type and the distance from the display. Each display will have a minimum and a maximum viewing distance that may vary based on application and intended use. A large character will have a longer viewing distance while a small character will have a shorter viewing distance. ERALED uses 50 feet for every one inch of character distance as a general point of reference. Character spacing, also known as pixel pitch, will vary between indoor and outdoor display applications.
11.Concept or define of LED display viewing angle: the viewing angle is the viewing angle where the measured light intensity is 50% of its maximum value(seeing from the middle front). Measuring brightness or luminosity is done by using a spectroradiometer. Spectroradiometers typically take measurements of spectral irradiance and spectral radiance, which spectral data can be used to calculate luminosity (cd/m²). When choosing a display, consider where it will be installed and the angle at which the display will be viewed. Image quality will be at it's best within the viewing angle of the display—where your primary intended audience should be located. Readability angle or viewing angle will normally exceed the optimum viewing angle depending on site-specific circumstances and ambient light conditions.
12.The Relationship between LED display Brightness and Viewing Angle
What is the difference between a LED display' brightness and viewing angle. Well depending on the environment (indoor or outdoor) where a LED display is installed, the requested brightness of a LED display is different according to the environmental contrast ratio.
Difference between Indoor LED display and Outdoor LED display Brightness and Viewing Angle
Indoor LED display request a lower brightness but request a high viewing angle. On the other hand outdoor LED display' request a higher brightness, and also a much better better grey grade. Therefore the outdoor LED display' viewing angle request is not as high as an indoor LED display, generally between ± 35--± 50 degrees.
Relationship between LED display' Brightness and Viewing Angle
If the viewing angle of the LED display becomes lower, the LED display brightness will be higher, or vice versa. If the contrast ratio between LED display' brightness and environmental brightness is higher, the LED display' showing performance will be more colorful. However, if the brightness of the LED display is too high, it is bad for the human eye, and much more power consumption will be wasted. Also much more heat will be produced, and then the temperature becomes much higher. For that the led chip's brightness decreases much faster, and of course, its lifespan will become shorter.
13. Refresh Rate and Frame-Changing Frequency of LED Displays
A LED Display is a full digital equipment which is driven by the impulse current. The Gray-scale and Brightness is realized by PWM (pulse-width-modulation) and the illumination of a LED is a pulse-type. When the frequency of pulse repeating is not fast enough, the human sight would feel twinkling.
Ferry Porter Rule and Critical Fusion Frequency
So, how high the frequency can eliminate the twinkling? Ferry-Porter rule points out, when watching a pulse illumination, coming with the improvement of the pulse repeating frequency, there is a critical point for human eyes. People will feel the illumination continuous, when the frequency is higher than the critical point. That's we call Critical Fusion Frequency.
Refresh Rates for Full Color LED display and LED Display s
A refresh Rate defines how many times the content on the LED Display repeats in each second. According to the Ferry-Porter rule, and our experience, to eliminate the image twinkling, the refresh rate for full color LED Display should be higher than 240Hz, and for full color LED Display with a brightness higher than 4000nits, the refresh rate must be higher than 400Hz.
Refresh Rates for Full Color LED display for Camera Recording
If there is a camera catching the image and video on the LED Display , or when relaying a TV broadcast (LED display for stages, arenas, events, etc.), it's necessary to enhance the refresh rate to 2000Hz+. For LED Display and LED display, it is enough to ensure the smooth image and video with the 50/60Hz Frame-Changing Frequency. And the meaning is not so big to improve further.
Disadvantage High Refresh Rates for LED display
As a disadvantage of high refresh rate, the LED Display lifetime would be short, to a certain extent.
14.How does the LED display work?
A LED display that is 60 feet (20 meters) high has to do the same thing that a normal television set does -- it has to take a video signal and convert it into points of light. If you have read How Television Works, then you know how a television that uses a cathode ray tube (CRT) does this.
Here is a quick summary of how a black-and-white TV works:
The electron beam in a CRT paints across the Display one line at a time. As it moves across the Display, the beam energizes small dots of phosphor, which then produce light that we can see.
The video signal tells the CRT beam what its intensity should be as it moves across the Display. You can see in the following figure the way that the video signal carries the intensity information.
The initial five-microsecond pulse at zero volts (the horizontal retrace signal) tells the electron beam that it is time to start a new line. The beam starts painting on the left side of the Display, and zips across the Display in 42 microseconds. The varying voltage following the horizontal retrace signal adjusts the electron beam to be bright or dark as it shoots across.
The electron beam paints lines down the face of the CRT, and then receives a vertical retrace signal telling it to start again at the upper right-hand corner.
A color Display does the same thing, but uses 3 separate electron beams and 3 dots of phosphor (red, green and blue) for each pixel on the Display. A separate color signal indicates the color of each pixel as the electron beam moves across the display. As the electron beam paints across the Display, it is hitting the phosphor on the Display with electrons. The electrons in the electron beam excite a small dot of phosphor and the Display lights up. By rapidly painting 480 lines on the Display at a rate of 30 frames per second, the TV Display allows the eye to integrate everything into a smooth moving image.
CRT technology works great indoors, but as soon as you put a CRT-based TV set outside in bright sunlight, you cannot see the display anymore. The phosphor on the CRT simply is not bright enough to compete with sunlight. Also, CRT displays are limited to about a 36-inch Display. You need a different technology to create a large, outdoor Display that is bright enough to compete with sunlight. LEDs may be little, but new high-brightness models are producing a considerable amount of light.
First used as status and indicator lamps, and more recently in under-shelf illumination, accent lighting, and directional marking applications, high-brightness LEDs have emerged within the last six years. But only recently have they been seriously looked upon as a feasible option in general purpose lighting applications. Before you recommend or install this type of lighting system, you should understand the basic technology upon which these devices are based.
Light-emitting diodes (LEDs) are solid-state devices that convert electric energy directly into light of a single color. Because they employ "cold" light generation technology, in which most of the energy is delivered in the visible spectrum, LEDs don't waste energy in the form of non-light producing heat. In comparison, most of the energy in an incandescent lamp is in the infrared (or non-visible) portion of the spectrum. As a result, both fluorescent and HID lamps produce a great deal of heat. In addition to producing cold light, LEDs:
Can be powered from a portable battery pack or even a solar array.
Can be integrated into a control system.
Are small in size and resistant to vibration and shock.
Have a very fast "on-time" (60 nsec vs 10 msec for an incandescent lamp).
Have good color resolution and present low, or no, shock hazard.
The centerpiece of a typical LED is a diode that is chip-mounted in a reflector cup and held in place by a mild steel lead frame connected to a pair of electrical wires. The entire arrangement is then encapsulated in epoxy. The diode chip is generally about 0.25 mm square. When current flows across the junction of two different materials, light is produced from within the solid crystal chip. The shape, or width, of the emitted light beam is determined by a variety of factors: the shape of the reflector cup, the size of the LED chip, the shape of the epoxy lens and the distance between the LED chip and the epoxy lens. The composition of the materials determines the wavelength and color of light. In addition to visible wavelengths, LEDs are also available in infrared wavelengths, from 830 nm to 940 nm.
The definition of "life" varies from industry to industry. The useful life for a semiconductor is defined as the calculated time for the light level to decline to 50% of its original value. For the lighting industry, the average life of a particular lamp type is the point where 50% of the lamps in a representative group have burned out. The life of an LED depends on its packaging configuration, drive current, and operating environment. A high ambient temperature greatly shortens an LED's life.
Additionally, LEDs now cover the entire light spectrum, including red, orange, yellow, green, blue, and white. Although colored light is useful for more creative installations, white light remains the holy grail of LED technology. Until a true white is possible, researchers have developed three ways to deliver it:
Blend the beams. This technique involves mixing the light from multiple single-color devices. (Typically red, blue, and green.) Adjusting the beams' relative intensity yields the desired color.
Provide a phosphor coating. When energized photons from a blue LED strike a phosphor coating, it will emit light as a mixture of wavelengths to produce a white color.
Create a light sandwich. Blue light from one LED device elicits orange light from an adjacent layer of a different material. The complementary colors mix to produce white. Of the three methods, the phosphor approach appears to be the most promising technology.
Another shortcoming of early LED designs was light output, so researchers have been working on several methods for increasing lumens per watt. A new "doping" technique increases light output several times over compared to earlier generations of LEDs. Other methods under development include:
Producing larger semiconductors.
Passing larger currents with better heat extraction.
Designing a different shape for the device.
Improving light conversion efficiency.
Packaging several LEDs within a single epoxy dome.
One family of LEDs may already be closer to improved light output. Devices with enlarged chips produce more light while maintaining proper heat and current management. These advances allow the units to generate 10 times to 20 times more light than standard indicator lights, making them a practical illumination source for lighting fixtures.
Before LEDs can enter the general illumination market, designers and advocates of the technology must overcome several problems, including the usual obstacles to mainstream market adoption: Industry-accepted standards must be developed and costs must be reduced. But more specific issues remain. Things like lumen-per-watt efficacy and color consistency must be improved, and reliability and lumen maintenance should be addressed. Nevertheless, LEDs are well on their way to becoming a viable lighting alternative.
There are two big differences between a LED display Display that you see at a stadium and the TV in your home:
Obviously, it is gigantic compared to your TV. It might be 60 feet (20 meters) high instead of 18 inches (0.5 meters) high.
It is incredibly bright so that people can see it in sunlight.
To accomplish these feats, almost all large-Display outdoor displays use light emitting diodes (LEDs) to create the image. LEDs are, essentially, little colored light bulbs. Modern LEDs are small, extremely bright and use relatively little power for the light that they produce. Other places you now see LEDs used outdoors are on traffic lights and automobile brake lights.
On a color CRT television set, all of the colors are produced using red, green and blue phosphor dots for each pixel on the Display:
In a LED display, red, green and blue LEDs are used instead of phosphor. A "pixel" on a LED display is a small module that can have as few as three or four LEDs in it (one red, one green and one blue). In the biggest LED displays, each pixel module could have dozens of LEDs. Pixel modules typically range from 4 mm to 4 cm (about 0.2 to 1.5 inches) in size.
To build a LED display, you take thousands of these LED modules and arrange them in a rectangular grid. For example, the grid might contain 640 by 480 LED modules, or 307,200 modules. The size of the ultimate Display depends on the size of the LED modules
15.LED Display Color depth
"Dimming" and "shading" refer to entirely different functions and the terms should not be interchanged. The word "dimming" refers to a uniform brightness adjustment across the entire display to correct the intensity for ease of reading different ambient light conditions. "Shading" or color depth, affects the light output variations of each individual red, green and blue LED to create images within the display.
Color depth chat
Bits per color
Resulting shades per color
Resulting RGB color capability
25 * 25 * 25 = 32,768 colors
Calculation explanation: Each individual red, green and blue LED be in one of two states, either on or off. This example uses a color data processing of 5 bits for each color is 2 to the 5th power and multiplying each color's depth provides the overall color depth of 32,768 colors.
Although "dimming" and "shading" have different meanings, some manufacturers will combine greyscale shading values with dimming values to create a color specification that appears more impressive on paper than it is capable of producing in the field.Combining shading values with overall dimming values is a deceiving and misleading practice. Below is an incorrect calculation that includes dimming as part of the color depth:
25 * 25 * 25*32 dimming = 1 million colors
16.What LED lamps brand to choose when buying a LED display
The LED's are surely the most important quality criteria when it comes to LED video displays. They determine the image quality of the display and are decisive in determining how the image quality is retained over time. The quality characteristics for LED's are very diverse, and, here too, the maxim applies: the most expensive choice is not always the best choice. To highlight an example from the automobile industry: You are sure to be able to spontaneously list a variety of luxury sedans, though you may not generally consider these when selecting a new vehicle. Price and purpose play major roles in the decision of which model to choose. And also, luxury sedans differ in many ways, although they often all meet the highest quality standards.
The quality of an LED is determined primarily by the chip used. It determines the service life of the LED and how the lighting behavior of the LED changes over time. The mayor Chip manufacturers of LED's are:
The prevailing opinion on the market today is that LED's made by Nichia are the best for use in LED video displays. However, they are also undeniably the most expensive LED's on the market by a wide margin. The price of LED's varies on average from less than one cent per LED to up to 15 cents and more, depending on the type of LED (RGB LED's with three chips in one housing are often more expensive). An extensive price difference can arise in manufacturing, depending on the LED's used.
The most important factor for purchasing a LED display and determining which LED's to choose are:
•Brightness: The brightness of the LED's is measured in mcd (milli-candela). The higher the brightness, the better. You can run the display at a lower brightness, thus increasing the service life or increasing visibility during the day when the sun is shining.
•Electrostatic Discharge(ESD): The LED chips produced by various manufacturers differentiate themselves through a varying sensitivity to the effects of electrostatic discharge (for example due to contact). Display failures caused by electrostatic discharges can be prevented by implementing safeguarding measures against ESD in the production process. The following LED chips listed are indicating the voltages that the LED's can withstand in case of electrostatic discharges:
●Taiwanese LED Chips: 800V
●Chinese LED Chips: 200~800V
•Sensitivity to Temperature Variations: Poor LED chips can fade faster, i.e. their service life can shorten, if they are exposed to high temperature variations. Depending on the country, temperatures can become extremely hot or cold during the summer or winter months, respectively. As a result, a poor LED quality could cause premature fading of the overall, expensive LED display.
•General Service Life: The general service life of the LED's often lies between 50,000 and 100,000 hours. (100,000 hours equates to 10 years of continuous display operation at full white, if no other factors exist which reduce the service life; such as increased heat in the display housing, or operating the LED's at overvoltage in order to balance brightness reduction.
•Brightness Reduction due Aging: Below is a table indicating the lighting reductions which arise within the first 10,000 hours: LED brightness reduction after the first 10,000 hours, sorted by manufacturer:
For the advertising screens we recommend always Silan LED's, or the Cree LED's which are a little more expensive than the Silan LED's. Nichia LED's, which are at least twice as expensive than Silan LED's, for LED display is mostly used for the professional industry like on stages or for television programs where quality is of high importance due to the high brightness and longer lifetime, and professionals invest a higher amount to have the screen performance and quality optimal at all times if not they are out of business and glamour is important in those industries. For advertising screens which are placed outside that quality is not necessary to be as optimal as the professional industry like stages or television programs because the screen is seen as an investment to shorten the ROI to less than 1 year and using the screen for advertising for over a period of at least 5 years to 8 years and gain 5 to 7 years from advertising.
If investing in Silan LED's the initial investment is about 25%(Cree) to 50%(Nichia) lower than investing in Cree and Nichia LED's. So for that Silan LED's will have an ROI of around 1 year depending on the portfolio of clients that the screen owner has, the place where it is placed and price of the advertisements. When advertisers want to publish their products on the screen, of course quality is important but in practical terms the selling price of the commercial space on the screen will be the same if used Nichia or Silan or Cree LED's because they don't care about the lifetime and differences of brightness between Nichia, Silan or Cree LED's, they just want to be seen and promote their products and or services on the screen. What is important for the publicity clients is the resolution, if it doesn't look pixelated they do see that as a plus and will attract more advertisers because the better the resolution the higher the impact of the advertisement and the higher the company's goodwill of the product announced. Also for Nichia and Cree LED's the ROI is one and a half to twice the time in comparison to Silan LED's which is two years at least.
Normally Silan and Cree LED's need 100,000 hours to reach around 40% of its total original brightness, Nichia will need 100,000 hours to reach 60% of its total original brightness. This is because the materials used are much more expensive for the Nichia LED's than for the Cree and Silan LED's and are better conductors. Besides Nichia uses around 50% of the energy used to burn the LED's in comparison to the Silan and Cree LED's. For example 1sqm of 16mm pixel pitch Silan and Cree LED's consumes around 1200W/m2 and Nichia 575w/m2 which is less than 50% to get the same amount of brightness.
Many of the quality factors for LED's play a role in how they behave over time. Nichia LED's are the only ones for which it is generally known that they thoroughly meet the required criteria, positively setting themselves apart from other LED's on the market. The long-term values for some of the other manufacturers were not available. Many developments in the LED field are so new that long-term values over five, ten, or more years don't exist yet. If price and performance should be balanced, we recommend LED's with Silan chips. In terms of overall service life, Silan LED's are 1/3 weaker than Nichia LED's but they cost significantly less. With the service life of Silan LED's, you can run your display for 6 years of continuous operation at full white, although running the screen at full white is never done in reality. In displaying average video image content, the effective service life increases by two to four times as much, that is, 14 to 28 years, depending on the image content. In contrast to the still very expensive Cree LED's, Silan LED's age more evenly and also don't have as much lighting reduction after 10,000 hours. This proves particularly lucrative when exchanging individual pixel cards, since the calibration requirement is lower.