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Television - Wikipedia. This article is about television as a medium. For the appliance itself, see television set. Flat- screen televisions for sale at a consumer electronics store in 2.

A Television (TV) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in colour, and in two or three dimensions and sound. The term can refer to a television set, a television program ("TV show"), or the medium of television transmission. Television is a mass medium for entertainment, education, news, politics, gossip, and advertising. Television became available in crude experimental forms in the late 1. After World War II, an improved form of black- and- white TV broadcasting became popular in the United States and Britain, and television sets became commonplace in homes, businesses, and institutions. During the 1. 95.

In the mid- 1. 96. US and most other developed countries.

The availability of multiple types of storage media such as Betamax, VHS tape, local disks, DVDs, flash drives, high- definition Blu- ray Discs, and digital video recorders have enabled viewers to watch prerecorded material—such as movies— at home on their own time schedule. For many reasons, the storage of television and video programming now occurs on the cloud. At the end of the first decade of the 2. Another development was the move from standard- definition television (SDTV) (5. HDTV), which provides a resolution that is substantially higher.

HDTV may be transmitted in various formats: 1. Since 2. 01. 0, with the invention of smart television, Internet television has increased the availability of television programs and movies via the Internet through streaming video services such as Netflix, Amazon Video, i. Player, Hulu, Roku and Chromecast.

In 2. 01. 3, 7. 9% of the world's households owned a television set.[2] The replacement of early bulky, high- voltage cathode ray tube (CRT) screen displays with compact, energy- efficient, flat- panel alternative technologies such as plasma displays, LCDs (both fluorescent- backlit and LED), and OLED displays was a hardware revolution that began with computer monitors in the late 1. Most TV sets sold in the 2. LEDs. Major manufacturers announced the discontinuation of CRT, DLP, plasma, and even fluorescent- backlit LCDs by the mid- 2.

In the near future, LEDs are expected to be gradually replaced by OLEDs.[6] Also, major manufacturers have announced that they will increasingly produce smart TVs in the mid- 2. Smart TVs with integrated Internet and Web 2. Television signals were initially distributed only as terrestrial television using high- powered radio- frequency transmitters to broadcast the signal to individual television receivers. Alternatively television signals are distributed by coaxial cable or optical fiber, satellite systems and, since the 2.

Internet. Until the early 2. A standard television set is composed of multiple internal electronic circuits, including a tuner for receiving and decoding broadcast signals. A visual display device which lacks a tuner is correctly called a video monitor rather than a television. Watch Apollo 18 Full Movie on this page. Etymology. The word television comes from Ancient Greekτῆλε (tèle), meaning 'far', and Latinvisio, meaning 'sight'. The first documented usage of the term dates back to 1.

Russian scientist Constantin Perskyi used it in a paper that he presented in French at the 1st International Congress of Electricity, which ran from 1. August 1. 90. 0 during the International World Fair in Paris. The Anglicised version of the term is first attested in 1.

It was ".. formed in English or borrowed from French télévision."[1. In the 1. 9th century and early 2. The abbreviation "TV" is from 1.

The use of the term to mean "a television set" dates from 1. The use of the term to mean "television as a medium" dates from 1.

The slang term "telly" is more common in the UK. The slang term "the tube" or the "boob tube" refers to the bulky cathode ray tube used on most TVs until the advent of flat- screen TVs. Another slang term for the TV is "idiot box".[1. History. Mechanical.

The Nipkow disk. This schematic shows the circular paths traced by the holes that may also be square for greater precision. The area of the disk outlined in black shows the region scanned. Facsimile transmission systems for still photographs pioneered methods of mechanical scanning of images in the early 1. Alexander Bain introduced the facsimile machine between 1. Frederick Bakewell demonstrated a working laboratory version in 1.

Willoughby Smith discovered the photoconductivity of the element selenium in 1. As a 2. 3- year- old German university student, Paul Julius Gottlieb Nipkow proposed and patented the Nipkow disk in 1. This was a spinning disk with a spiral pattern of holes in it, so each hole scanned a line of the image.

Although he never built a working model of the system, variations of Nipkow's spinning- disk "image rasterizer" became exceedingly common.[1. Constantin Perskyi had coined the word television in a paper read to the International Electricity Congress at the International World Fair in Paris on 2. August 1. 90. 0. Perskyi's paper reviewed the existing electromechanical technologies, mentioning the work of Nipkow and others.[1. However, it was not until 1. Lee de Forest and Arthur Korn, among others, made the design practical.[1. The first demonstration of the live transmission of images was by Georges Rignoux and A. Watch Sharpay`S Fabulous Adventure Download Full here. Fournier in Paris in 1.

A matrix of 6. 4 selenium cells, individually wired to a mechanical commutator, served as an electronic retina. In the receiver, a type of Kerr cell modulated the light and a series of variously angled mirrors attached to the edge of a rotating disc scanned the modulated beam onto the display screen.

A separate circuit regulated synchronization. The 8x. 8 pixel resolution in this proof- of- concept demonstration was just sufficient to clearly transmit individual letters of the alphabet. An updated image was transmitted "several times" each second.[1. In 1. 92. 1 Edouard Belin sent the first image via radio waves with his belinograph. In 1. 91. 1, Boris Rosing and his student Vladimir Zworykin created a system that used a mechanical mirror- drum scanner to transmit, in Zworykin's words, "very crude images" over wires to the "Braun tube" (cathode ray tube or "CRT") in the receiver. Moving images were not possible because, in the scanner: "the sensitivity was not enough and the selenium cell was very laggy".[1. Baird in 1. 92. 5 with his televisor equipment and dummies "James" and "Stooky Bill" (right).

By the 1. 92. 0s, when amplification made television practical, Scottish inventor John Logie Baird employed the Nipkow disk in his prototype video systems. On 2. 5 March 1. 92.

Baird gave the first public demonstration of televised silhouette images in motion, at Selfridge's Department Store in London.[1. Since human faces had inadequate contrast to show up on his primitive system, he televised a ventriloquist's dummy named "Stooky Bill", whose painted face had higher contrast, talking and moving. By 2. 6 January 1.

This is widely regarded as the first television demonstration. The subject was Baird's business partner Oliver Hutchinson. Baird's system used the Nipkow disk for both scanning the image and displaying it. A bright light shining through a spinning Nipkow disk set with lenses projected a bright spot of light which swept across the subject.