Displays using LEDs

Displays based on light-emitting diodes (LEDs) are discussed in this article. Those who need LED-backlit displays might see LED-backlit LCD. As for matrixed text displays, they might see Dot-matrix display. To avoid confusion with the vacuum fluorescent display, there are seven-segment displays, nine-segment displays, fourteen-segment displays, and sixteen-segment displays.

LED displays use light-emitting diodes as pixels for displaying video. They can be used outdoors for store signs and billboards, since their brightness allows them to be seen in the sun. A common application of these signs in recent years has been destination signs on public transportation vehicles, as well as variable-message signs on highways. In addition to visual display, displays can provide general illumination, such as when used for stage lighting or other decorative (as opposed to informational) purposes. In addition to offering better contrast ratios than traditional projectors, Led ekran can also be used to create large, uninterrupted video walls (without visible bezels between individual screens). LED displays with microLEDs present significant development challenges due to their smaller LEDs.

Historiography

In the first decade, LEDs were predominantly red and were introduced in 1962. In 1962, Nick Holonyak created the first practical LED at General Electric, while he was there.

LED displays were developed by HP (Hewlett-Packard) and introduced in 1968.[2] The development was headed by Howard C. Borden and Gerald P. Pighini at HP Associates and HP Labs, who had conducted research on practical LED displays between 1962 and 1968. A year after the Nixie tube was replaced by these units, HP introduced the 5082-7000 numeric indicator. [3] This was the first LED device to use integrated circuit technology (integrated LED circuit); it was also the first display to use intelligent LEDs, thus becoming the basis for subsequent LED displays. It was not until the late 1980s that Blue LEDs completed the color triad.

LEDs made of Aluminium Indium Gallium Phosphide appeared in the late 1980s. Displays of information relied on them for a reliable source of red and amber. Still, full colour was not possible. A “green” that was available was barely green at all – mostly yellow, and a blue that was available had high power consumption. In 1997, Mark Fisher’s design for U2’s “Popmart” tour created a major shift in how LEDs could be used. Shuji Nakamura, at Nichia Chemical, developed the blue (and later green) LED based on Indium Gallium Nitride, opening the door to big video displays using LEDs. He realized that images can be very large at night, particularly if viewed at a long distance, by using a wide pixel spacing. A mesh arrangement that could be rolled up for transport was used because the system needed to be suitable for touring. In total, the display covered a span of 52m (170ft) wide and 17m (56ft) tall. 150,000 pixels were displayed on the screen.the screen. SACO Technologies of Montreal, the company that supplied the LED pixels and their control system, had never before designed a video system. They previously built mimic panels for power station control rooms.

A wide array of colors can be seen on large displays today due to the use of high-brightness diodes. The Sony XEL-1 OLED screen was introduced in 2009, after three decades and organic light-emitting diodes. On the other hand, Sony later presented Crystal LED, a TV with a true LED display, instead of LEDs providing backlighting to other forms of display, such as the LED-backlit LCDs common to LED TVs.

 

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