An LED display (light-emitting diode, i.e. “light-emitting diode display”) is a display device based on light-emitting diodes.
Three types of light-emitting diode displays can be distinguished
– which consist of individual, discrete, dot-shaped, inorganic single-crystalline LEDs.
– which are composed of single, discrete, elongated, inorganic single-crystalline LEDs.
– OLEDs are composed of organic light-emitting diodes in thin-film technology on a common substrate as integrated matrices.
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History and overview
The first commercially used LED displays of the types 1 and 2 defined above were made from monolithic gallium arsenide single crystal wafers by sawing and contacting. These were used, among other things, to realize digit displays consisting of seven LED segments each (seven-segment displays, type 2), which were used as red luminous displays in products such as the first digital watches or pocket calculators in the early 1970s. These were replaced around the beginning of the 1980s by LCD displays, which had much lower power consumption.
This was later followed by red-colored alphanumeric small displays consisting of discrete, dot-shaped LEDs of type 1 arranged in a matrix. One application example is ticker displays (dynamic type displays), which are still used today, for example, by retailers or small service providers in shop windows, but also at train stations.
After different color displays became possible by combining different colored LEDs (additive color mixing of red, green and blue), the need for large displays of type 1 arose, especially in the advertising industry and in sports stadiums. In the meantime, thanks to the progressive miniaturization of LEDs, this technology allows pixel pitches smaller than 1 mm, which means that small-format displays from 82″ in full HD resolution can also be produced for indoor use.
The devices are mostly suitable for displaying HDR video and are characterized by durability and a brilliance that surpasses even OLEDs. For a more detailed description, see Video Wall.
JumboTron, sometimes called jumbovision, is a video monitor that uses widescreen television (video wall) technology. The original technology was developed in the early 1980s by Mitsubishi Electric and Sony, who used JumboTron as a trademark in 1985. Mitsubishi Electric marketed its version of this technology as Diamond Vision.
It was commonly used in sports stadiums and concert venues to show close-ups of events or even other sporting events taking place at the same time, as well as in outdoor public spaces (such as Times Square, for example).
The Jumbotron was invented in Japan in the 1980s[, but there is dispute between two competing Japanese companies, Mitsubishi Electric and Sony. In 1980 Mitsubishi introduced the first large-scale video card, the Diamond Vision, which was a large screen that used cathode ray tube technology, similar to tube televisions. They introduced this technology during the 1980 Major League Baseball All-Star Game at Los Angeles Stadium.
At Panasonic it was Astro Vision technology on fluorescent discharge lamps. They were just three competitors in the big screen industry.
But it was Sony that introduced Daktronics into the world of professional and college sports, because Sony sold Daktronics scoreboards and controllers exclusively with its video cards. Eventually Daktronics completely replaced Sony in this area.
In 1985 Sony introduced the term “JumboTron” to refer to its large-scale video cards. JumboTron was the trademark for the large-scale video boards originally produced by Sony, and was considered one of the largest non-projectable video displays ever produced. The author of the JumboTron is Sony director Yasuo Kuroki, who was previously involved in the development of the Walkman.
It was introduced at Expo ’85, held in Tsukuba, Ibaraki, in May 1985. At that time it had a screen resolution of 450,000 pixels and used the new Sony Trini-lite technology. This was a microprocessor lamp developed by one of Kuroki’s colleagues, Betamax chief engineer Yuji Watanabe. Trini-lite technology provided screen sharpness and computer control, laying the foundation for Sony’s first JumboTron.
Also read: Using Text To Speech for Presentations