In modern society, besides newspapers, radio and other traditional media and emerging media such as the Internet, television is one of the most important ways for people to obtain information. Life without television is really unimaginable. The development of television is also changing with each passing day. I remember when I was a child, I stayed in front of the 14 inch black and white TV at home every day, waiting for the Journey to the West to start. In just ten or twenty years, large screen, high definition and ultra-thin have become popular elements of TV, and the quality and quantity of TV programs have also made a great leap. Here, I will show you the history, present situation and future trend of TV development.
In modern society, besides newspapers, radio and other traditional media and emerging media such as the Internet, television is one of the most important ways for people to obtain information. Life without television is really unimaginable. The development of television is also changing with each passing day. Bian Xiao still remembers watching 14 inch black-and-white TV at home every day when he was a child, waiting for the Journey to the West to start. In just ten or twenty years, large screen, high definition and ultra-thin have become popular elements of TV, and the quality and quantity of TV programs have also made a great leap. Bian Xiao will show you the history, present situation and future trend of TV development.
The Past of Television: Pukov Disc, Mechanical Television and Electronic Television have achieved three milestones.
1883, the German electrical engineer Paul Nipkow used the Nipkow disk he invented to transmit images by mechanical scanning for the first time. Each picture has 24 lines, and the image is quite blurred. "Ni Pukov Disc" has also become the originator of television.
The first real TV appeared in 1925. On the basis of the NiePukov disc, British inventor john baird invented the mechanical scanning television camera and receiver, which transmitted the "cross" image for the first time at a distance of 4 feet, announcing the birth of the world's first television, so Baird was called "the father of television". However, mechanical TV has a fatal defect of low definition and sensitivity, and it was quickly replaced by electronic TV.
193 1 year, the American scientist Zvorruijin manufactured a relatively mature photoelectric camera tube, namely a TV camera. In an experiment, the image composed of 240 scanning lines was transmitted to a TV set four miles away, and then the image of a 9-inch kinescope was reflected by a mirror to the TV set, thus completing the process of shooting and developing the TV camera completely electronically. With the application of electronic technology in television, television began to go out of the laboratory and enter public life, becoming a real information dissemination medium. Cathode ray tube (CRT) has also become the core component of TV, and it has been used ever since. Television using cathode ray tube as imaging element is called cathode ray tube television for short.
The following are some representative ancient models in the history of TV development:
Baird Falkirk transmitted at 1926.
GE octagonal 1928
1929 semi-shutter
GE hm 17 1 in 1939
RCA62 1946+0TS
Admiral19111at 65438.
Tesla 4 102U inch 1957
Salac in 1969
Panasonic TR-005 is in 197 1 year.
Magnavox desktop in 1980
Present situation of TV: CRT is gradually eliminated, and LCD and plasma seize the market.
Nowadays, the televisions in ordinary people's homes, whether in definition or color, have made a great leap forward compared with the old ones. At present, the mainstream TV types in the market, except CRT TV, are slowly fading out of the market, and LCD TV and plasma TV are rapidly becoming the favored objects of consumers.
1888, Austrian botanists discovered a white viscous liquid. Later, German physicists discovered that it is an organic compound with regular molecular arrangement between solid and liquid. If heated, it will appear transparent liquid state, and after cooled, it will appear turbid solid state of crystal particles, hence the name liquid crystal, that is, liquid crystal. Liquid crystal display devices are also called LCD (liquid crystal display). The basic principle of LCD TV is to apply voltage to the liquid crystal between two pieces of glass, so as to control the arrangement and tortuous changes of molecules. The screen creates a picture through the collision of electron groups, and forms an image through the perspective reflection of external light. The first LCD device in the world appeared in the early 1970s. Nowadays, LCD TV has occupied the largest share of the flat-panel TV market.
Schematic diagram of LCD TV
Typical LCD TV
1964 In July, scientists from Illinois State University put forward the concept of PDP plasma display for the first time. The full name of PDP is plasma display panel, which is what we call plasma. PDP is a display device that uses inert gas ionization discharge to emit light. Like LCD, PDP is a matrix display device. The panel consists of regularly arranged pixel units, and each pixel unit corresponds to a plasma tube sealed cavity filled with neon-xenon mixed gas as a light-emitting element. When a high voltage is applied between the electrodes of the plasma tube, the gas in the chamber will discharge plasma and generate ultraviolet light, which will further excite the red, green and blue phosphors coated on the inner surface of the front panel to emit corresponding visible light to form an image.
Schematic diagram of plasma TV
Typical plasma TV
The future of TV: organic light-emitting diodes are ready to go. Many technologies have their own strengths.
The development speed of modern science and technology is beyond imagination. What will TV be like in the future? This topic is not only challenging, but also mysterious. People's pursuit of quality of life is endless. In the future, TV will certainly meet the different needs of all kinds of people: it may be intelligent, portable and oversized ... the imagination is endless, and nothing is too demanding.
Three-dimensional holographic image television
Stereo TV oversized TV
Portable TV
In the foreseeable future, TV will continue to develop in several directions, such as oversize, portability, thinness, energy saving and environmental protection. At present, the organic light emitting diode (OLED) which is promising to become the next generation display standard is the organic light emitting diode. Organic light-emitting diode (OLED) is active light-emitting, its anode is a thin and transparent indium tin oxide (ITO), its cathode is a metal component, and its organic material layer (including hole transport layer, light-emitting layer, electron transport layer, etc.). ) are sandwiched inside to form a "sandwich". When the current is switched on, the holes in the anode and the charges in the cathode will combine to generate light in the luminescent layer. According to the different organic materials sandwiched in it, it will emit different colors of light. OLED TV has the characteristics of thin thickness, high contrast, rich colors, high resolution and wide viewing angle.