Why do we use LED displays?

What is a LED display system?

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Components of a LED display system

Comparison of LED display systems to traditional displays

Benefits of using LED display systems

Modern applications of LED display systems

No wonder, LED display systems have become an integral part of everyday lives. You can find them in major places such as sports arenas, shopping malls, billboards, etc. So, what are LED displays and their structure? Are there benefits of using them? Let's find the answers in this post.

 

What is a LED display system?

 

Typically, an LED display is referred to as a screen display technology. This technology uses panels of LEDs as the main source of light. Electronic devices regardless of big and small are using LED display technology. These are used for interaction between the users and the display systems.

 

For commercial use, an LED display system constitutes the main screen display that you find around displaying advertisements everywhere. LED displays are known for their low power consumption and efficiency. In a massive LED display, you can find plenty of LED panels that consist of several LEDs.

 

Apart from using low energy, LED displays come with greater light intensity. Additionally, they have amazing brilliance as well. This is the reason why they are used in public places as commercial products.

 

Components of a LED display system

 

Led display systems have two important parts: An LED panel and a controller. The primary LED panel comes with multiple display units of LEDs, referred to as LED panels or LED cabinets. They are connected and constitute the main body of the LED display system.

 

So, that was everything about the LED panel. Speaking about the controller, it can be segregated into two parts. The controller includes the control board that represents the hardware and the control system that represents the software. A small computer, a receiving card, and a sending card are the components that you will find on the control board.

 

A wide range of cabinet units or display panels with separate controllers and specifications can become a part of the LED displays. They come with different control technologies and fulfill the demands of different types of applications in various environments. Some examples could include multifunction cards and video processors.

 

Comparison of LED display systems to traditional displays

 

When it comes to comparison between traditional displays and LED display systems, the main difference is in the backlights. While traditional displays use fluorescent backlights, LED displays use light-emitting diodes in place of backlights. As such, LEDs will have a better picture quality and be available in varying configurations.

 

Traditional displays give mediocre to poor visual performance when not viewed within the right viewing angles. The image produced on the display will consist of blurry lines, unsettling brightness, and poor contrast. Although LED displays have fewer viewing angles compared to traditional displays, LEDs influence the image quality to a great extent.

 

The power used by traditional displays and LEDs will depend on certain factors such as the brightness of the display, build quality, screen size, resolution, power-saver settings, etc. There is no denying that bigger displays with large resolutions will consume more power. Still, LED displays are more efficient than the traditional displays.

 

Benefits of using LED display systems

 

Below listed are the benefits of using LED display systems.

 

LED systems use high-end technology that not only gives performance but also is extremely reliable. These systems that are designed for digital billboards have changed the way things were a few years ago.

 

These display systems are lightweight and provide realistic, high-quality images.

 

Low energy consumption is what makes these systems amazing. They are eco-friendly options and help businesses reduce costs.

 

There is no limit to the size of LED display systems when it comes to installation. In terms of delivering advertisement messages, they can display as big as you want them to be.

 

An LED display system will have a prolonged lifespan compared to traditional systems.

 

Modern applications of LED display systems

 

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The main purpose of LED display systems is to illuminate places and objects with advertisements. Because of their massive sizes, low energy consumption, flexibility in usage, and extended lifetime, LED displays are almost everywhere these days.

 

Therefore, they are widely seen in LED display boards. These commercial, massive boards are a common sight these days and you can find them almost everywhere. Also, these boards are used outdoors as storage signs, storage signs, billboards, etc. On sign boards, you can find several languages that convey the signals. You can find these LED systems in airports, arenas, shopping malls, and many more.

Display technology

This article is about light-emitting diode (LED) based displays. For LED-backlit displays, see LED-backlit LCD . For matrixed text displays, see Dot-matrix display

Not to be confused with Vacuum fluorescent display

Detail view of an LED display with a matrix of red, green and blue diodes

A LED display is a flat panel display that uses an array of light-emitting diodes (LEDs) as pixels for a video display. Their brightness allows them to be used outdoors where they are visible in the sun for store signs and billboards. In recent years, they have also become commonly used in destination signs on public transport vehicles, as well as variable-message signs on highways. LED displays are capable of providing general illumination in addition to visual display, as when used for stage lighting or other decorative (as opposed to informational) purposes. LED displays can offer higher contrast ratios than a projector and are thus an alternative to traditional projection screens, and they can be used for large, uninterrupted (without a visible grid arising from the bezels of individual displays) video walls. microLED displays are LED displays with smaller LEDs, which poses significant development challenges.[1]

A LED video cube above the ice rink at Nokia Arena in Tampere, Finland.

Their use in cinemas to replace projectors and projection screens has been explored.[2][3][4]

History

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Light-emitting diodes (LEDs) came into existence in and were primarily red in color for the first decade. The first practical LED was invented by Nick Holonyak in while he was at General Electric.[5]

The first practical LED display was developed at Hewlett-Packard (HP) and introduced in .[6] Its development was led by Howard C. Borden and Gerald P. Pighini at HP Associates and HP Labs, who had engaged in research and development (R&D) on practical LEDs between and . In February , they introduced the HP Model - Numeric Indicator.[7] It was the first LED device to use integrated circuit (integrated LED circuit) technology,[7] and the first intelligent LED display, making it a revolution in digital display technology, replacing the Nixie tube and becoming the basis for later LED displays.[8]

Early models were monochromatic by design. The efficient Blue LED completing the color triad did not commercially arrive until the late s.[1]

In the late s, Aluminium Indium Gallium Phosphide LEDs arrived. They provided an efficient source of red and amber and were used in information displays. However, it was still impossible to achieve full colour. The available "green" was hardly green at all ' mostly yellow, and an early blue had excessively high power consumption. It was only when Shuji Nakamura, then at Nichia Chemical, announced the development of the blue (and later green) LED based on Indium Gallium Nitride, that possibilities opened for big LED video displays.

The entire idea of what could be done with LED was given an early shake up by Mark Fisher's design for U2's PopMart Tour of . He realized that with long viewing distances, wide pixel spacing could be used to achieve very large images, especially if viewed at night. The system had to be suitable for touring so an open mesh arrangement that could be rolled up for transport was used. The whole display was 52m (170ft) wide and 17m (56ft) high. It had a total of 150,000 pixels. The company that supplied the LED pixels and their driving system, SACO Technologies of Montreal, had never engineered a video system before, previously building mimic panels for power station control rooms.

Today, large displays use high-brightness diodes to generate a wide spectrum of colors. It took three decades and organic light-emitting diodes for Sony to introduce an OLED TV, the Sony XEL-1 OLED screen which was marketed in . Later, at CES , Sony presented Crystal LED, a TV with a true LED-display, in which LEDs are used to produce actual images rather than acting as backlighting for other types of display, as in LED-backlit LCDs which are commonly marketed as LED TVs.

Large video-capable screens

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The UEFA Champions League Final match between Manchester United and Barcelona was broadcast live in 3D format in Gothenburg (Sweden), on an EKTA screen. It had a refresh rate of 100 Hz, a diagonal of 7.11 m (23 ft 3.92 in) and a display area of 6.192×3.483 m, and was listed in the Guinness Book of Records as the largest LED 3D TV.[9][10]

Development

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Early prototypes

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A claim for the 'first all-LED flat panel television screen' is presented in this section. It was possibly developed, demonstrated and documented by James P. Mitchell in . Initial public recognition came from the Westinghouse Educational Foundation Science Talent Search group, a Science Service organization.[11][verification needed] The paper entry was named in the "Honors Group" publicized to universities on January 25, .[12] The paper was subsequently invited and presented at the Iowa Academy of Science at the University of Northern Iowa.[13][14] The operational prototype was displayed at the Eastern Iowa SEF[15] on March 18 and obtained a top "Physical Sciences" award and IEEE recognition. The project was again displayed at the 29th International SEF at Anaheim Ca. Convention Center on May 8'10.[16] The ¼-inch thin miniature flat panel modular prototype, scientific paper, and full screen (tiled LED matrix) schematic with video interface was displayed at this event.[17][18] It received awards by NASA[19] and General Motors Corporation.[20][21][22] This project marked some of the earliest progress towards the replacement of the 70+-year-old high-voltage analog CRT system (cathode-ray tube technology) with a digital x-y scanned LED matrix driven with an NTSC television RF video format. Mitchell's paper and operational prototype projected the future replacement of CRTs and included foreseen applications to battery operated devices due to the advantages of low power consumption. Displacement of the electromagnetic scan systems included the removal of inductive deflection, electron beam and color convergence circuits and has been a significant achievement. The unique properties of the light-emitting diode as an emissive device simplify matrix scanning complexity and have helped the modern television adapt to digital communications and shrink into its current thin form factor.

The model was monochromatic by design.

Recent developments

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MicroLED displays are currently under development by numerous major corporations such as Sony, Apple, Samsung, and LG.

These displays are easily scalable, and offer a more streamlined production process. However, production costs remains a limiting factor.[23]

The 40m large LED display at the Armin Only event in April in the Jaarbeurs Utrecht

See also

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References

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• LED displays at Wikimedia Commons

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