LED diodes came into existence in 1962 and were primarily red in color for the first decade. The first practical LED was invented by Nick Holonyak, Jr., in 1962 while he was at General Electric.
Early models were monochromatic by design. The efficient
Blue LED completing the color triad did not commercially arrive until the late 1980s.
In the late 1980s, 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 needed a power station to run it. It was only when Shuji Nakumura, 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 1997. 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 2009. Later, at
CES 2012, 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.
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 1977. Initial public recognition came from the Westinghouse Educational Foundation Science Talent Search group, a Science Service organization.
[3] The paper entry was named in the "Honors Group" publicized to universities on January 25, 1978.
[4] The paper was subsequently invited and presented at the Iowa Academy of Science at the University of Northern Iowa.
[5][6] The operational prototype was displayed at the Eastern Iowa SEF
[7] on March 18 and obtained a top "Physical Sciences" award and IEEE recognition. The project was again displayed at the 29th International SEF at the Anaheim Ca. Convention Center on May 8–10.
[8] The ¼-inch thin miniature flat panel modular prototype, scientific paper, and full screen (tiled LED matrix) schematic with video interface were displayed at this event.
[9][10] It received awards by
NASA[11] and
General Motors Corporation.
[12][13][14] This project marked some of the earliest progresses 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 a NTSC television RF video format. Mitchell's paper projected the future replacement of CRTs and included foreseen applications to battery operated devices due 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 simplifies matrix scanning complexity and has helped the modern television adapt to digital communications and shrink into its current thin form factor.
The 1977 model was monochromatic by design.
We are also making lighting and everything.
Signage is the design or use of
signs and symbols to communicate a message to a specific group, usually for the purpose of marketing or a kind of advocacy.
[1][2] A signage also means signs
collectively or being considered as a group.
[3] The term
signage is documented to have been popularized in 1975 to 1980.
[2]
The main purpose of signs is to communicate, to convey information designed to assist the receiver with decision-making based on the information provided. Alternatively, promotional signage may be designed to persuade receivers of the merits of a given product or service. Signage is distinct from
labeling, which conveys information about a particular
product or service.
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