Television (TV) is a device that uses electronic technology to transmit moving pictures and audio signals, first invented by British engineer John Logie Baird in 1925, TV is recognized as "one of the most important inventions of the twentieth century.
TV is mainly composed of signal system, scanning system and power circuit, etc. Modern TV can be divided into five categories: WebTV, DTV, IPTV, mobile TV and outdoor TV.
The history of television
Christmas 1883
Nipkoff, a German electrical engineer, used his invention "Nipkoff disc" to make the first experiment of image emission using mechanical scanning method. Each image had 24 lines, and the image was quite blurred.
1908
Kemper Swinton, England Swinton, Russia, Rosenkov proposed the principle of electronic scanning, laying the theoretical foundation of television technology.
1923
One of the inventors of television, the Soviet-American Zvarikin (also translated as Vladimir Svorokin) invented electrostatic accumulation camera tube. 1923 invented the electronic sweep book tracing type picture tube, which is the pioneer of television camera technology.
1925
John Lodge, England Lodge. Baird, according to the "Nipkoff disc" carried out new research work, the invention of mechanical scanning television cameras and receivers. At that time, the picture resolution is only 30 lines, the scanner can only 5 times per second sweep through the scanning area, the picture itself is only 2 inches high, one inch wide. In a small store in London made a show to the public.
1926
Baird, one of the inventors of television, gave a performance of broadcasting and receiving television to the British press.
1927 - 1929
Baird makes the first electromechanical television trial via telephone cable; the first shortwave television trial; the British Broadcasting Corporation begins to broadcast television programs continuously over a long period of time.
1930
Simultaneous distribution of television pictures and sound is achieved.
1931
For the first time, the film was brought to the television screen. People in London enjoy live broadcasts of the famous local horse races in England on television. One of the inventors of television, American Ferrell Farnsworth, invented a tube television set that could project 25 images per second.
1936
The British Broadcasting Corporation adopted Baird's electromechanical television broadcasting, and for the first time broadcast television images with high definition, which entered the practical stage.
1939
The American Radio Company began broadcasting all-electronic television. The first black-and-white TV projector was invented in Switzerland by Phipp.
1940
American Gurma developed electromechanical color television system.
December 17, 1949
The first television cable between London and Souden, England, was opened for use. The first television cable between London, England and Souden-Corphyrt was opened.
1951
H. Lowe invented the three-gun shaded color picture tube and Lorenzo invented the single-gun color picture tube.
1954
The first all-transistor television receiver was developed by Texaco Instruments.
1966
Radio Corporation of America developed integrated circuit television sets, and three years later produced color television receivers with electronic tuning devices.
1972
Japan developed a color TV projector.
1973
Digital technology was used for television broadcasting, and experiments proved that digital television could be used for satellite communications.
1976
The UK completed research on the "TV Library" system, which allowed users to check news, books, newspapers and magazines directly on their TV sets.
1977
The first portable TV sets were developed in the UK.
1979
The world's first "cable TV" was launched in London. It was invented by the British Post Office. It transmits information from a computer over an ordinary telephone line and displays it on the user's television screen.
1981
Sony Japan developed a pocket-sized black-and-white TV set with an LCD screen of only 2.5 inches, powered by batteries.
1984
Japan's Panasonic launched the "Cosmic TV". The system's screen width of 3.6 meters, 4.62 meters high, equivalent to 210 inches, can be placed on a small truck, in the streets and squares and other places where needed to broadcast. The system uses Panasonic's exclusive "high luminance color light-emitting tubes," which provide bright, vivid colors even in daylight and outdoors.
March 17, 1985
At the Tsukuba Science World Expo in Japan, an ultra-small screen color TV wall built by Sony was unveiled. It is located in the central square, 40 meters long and 25 meters high, with an area of 1,000 square meters, and the whole building is as high as a 14-story building. Equivalent to a 1857-inch color TV. The ultra-small screen consists of 36 small luminous screens, each weighing 1 ton and 1.8 meters thick 4 lines of 9 works with a total of 450,000 colorful luminous elements. Through its top-mounted camera, it can display various activities at the venue at any time and play various advertising sex videos from Sony.
1985
British Telecom (BT) launched an integrated digital communications network. It provides users with voice, fast transmission of charts, faxes, slow-scan TV terminals, etc.
Nov. 25, 1991
Sony Japan's high-definition television began trial broadcasting: its scan lines for 1125, image quality increased by 100%; screen aspect ratio changed from the traditional 9:12 to 9:16, enhancing the viewer's sense of scene; flat-screen view from 10 degrees to 30 degrees, reflecting the picture more depth; TV surface image "pixel" from 280,000 to 1.27 million per unit area of the screen information increased by nearly four times ...... Therefore, the distance to watch high-definition television is not 7 times the screen height in the past but three times, and the accompanying sound is realistic, using 4-channel high-fidelity stereo sound, infectious.
1995
Sony Japan launched ultra-miniature color TV receiver (i.e., palm color TV), only as small as the palm of your hand, weighing 280 grams. With speakers, also has a headphone jack, LCD display about 5.5 cm, the picture seems small, but the image is clear, its most obvious feature is: the human body as an antenna to obtain the effect of viewing, watching TV will be two leads in the neck, you can obtain outdoor antenna-like effect.
1996
Sony Japan to market "wall-mounted" type TV: its length of 60 cm, 38 cm wide, while the thickness of only 3.7 cm, weighing only 1.7 kg, like a mural.
