The LED screen is a flat-panel display, which uses an array of light-emitting diodes as pixels for video display. Their brilliance allows them to be used outdoors where they are seen in the sun for signs of shops and billboards, and in recent years they have also become commonly used in destination signs on public transport vehicles, as well as signs message-variable on the highway. LED displays provide general illumination in addition to visual display, such as when used for stage lighting or other decorative purposes (as opposed to information).
Video LED display
History
The first real-time all-LED flat screen television may have been developed, demonstrated and documented by James P. Mitchell in 1977. Early public recognition came from the Westinghouse Science Talent Search Group, a Science Service organization. The paper entries named in "Honors Group" were published to the university on January 25, 1978. This paper was later invited and presented at the Iowa Academy of Science at the University of Northern Iowa. The operational prototype was shown at Eastern Iowa SEF on March 18 and was awarded the "Physical Science" and the IEEE recognition. The project was re-displayed at SEF International 29 in Anaheim Ca. Convention Center on May 8-10. The ¼ inch thin flat-panel miniature prototype prototype, scientific paper, and full screen (tiled LED matrix) schematic with video interface are displayed on the show. It received the award by NASA and General Motors Corporation. This project marks some early progress towards the replacement of a 70 year old high voltage analogue CRT system (cathode ray tube technology) with a digital x-y scan matrix LED-driven NTSC video format RF video. The Mitchell paper projects future CRT replacements and includes anticipated applications to battery-operated devices due to low power overload. The displacement of an electromagnetic scanning system includes the removal of inductive deflection, electron beam and color convergence circuits and has become a significant achievement. The unique properties of light-emitting diodes as emitting devices simplify the complexity of matrix scanning and have helped modern television adapt to digital communications and shrink into the thin form factor of today.
The 1977 model is monochromatic based on design. The Blue LEDs efficiently complete the color triad, not coming for a decade. The large screen now uses a high-brightness diode to produce a wide spectrum of colors. It takes three decades and organic light-emitting diodes for Sony to introduce OLED TVs, Sony XEL-1 OLED screens marketed in 2009. Then, at CES 2012, Sony brings Crystal LEDs, TVs with true LED screens (where LEDs are used for produces an actual image rather than acting as a backlight for other types of screens, as in LED-backlit LCDs commonly marketed as LED TVs).
The 2011 UEFA Champions League Final between Manchester United and Barcelona is broadcast live in 3D format in Gothenburg (Sweden), on the EKTA screen. It has a refresh rate of 100 Hz, a diagonal of 7.11 m (23Ã, 3.92 ft) and a display area of ​​6,192ÃÆ'â € "3,483 m, and is listed in the Guinness Book of Records as the largest 3D LED TV.
Maps LED display
See also
- AMOLED
- QLED
References
External links
- Media associated with LED displays on Wikimedia Commons
Source of the article : Wikipedia
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