LCD Televisions – History And More Informations

LCD Televisions

Televisions have come a long way since their invention by Philo Taylor Farnsworth in 1928. Today, Liquid Crystal Display sets, known as LCD televisions, are one of the most up to date types of televisions you can purchase. They are competing with other types of televisions, including Projection TV, Light Emitting Diode (LED) televisions, Plasma TV, HDTV, and new Organic Light Emitting Diode (OLED) television sets.

LCD televisions today are full color televisions sets. They produce images using liquid crystal display technology, which also allows them to be quite a bit thinner and also lighter than the old cathode ray tube sets. The screen displays can be much larger than those allowed by CRT technology. With falling costs of production, the LCD televisions seemed destined to overtake the industry. Other large television formats, such as rear projection television and plasma television are losing market share to the new LCD televisions. There is, however, new competition against LCD televisions by Organic Light Emitting Display televisions and others on the horizon.

LCD televisions work with white light, and filtering that light to display a colored image on the screen. This requires backlighting by cold cathode fluorescent lamps on most sets. Some use LED lighting instead for the white backlighting. LCD technology is inefficient in that most of the light, about 90% of light produced never reaches the viewer as it is used or distracted prior to reaching the viewing screen. They take a lot of power, which adds to the inefficiency and they are similar in power use to the CRT televisions.

This television uses a system of LCD shutters in a grid, which allow different amounts of light to pass by opening and closing the shutters. There is a colored filter with each shutter that removes unnecessary colors, all by the red, green and blues, from the white light passing through the shutter system. These work to form a tiny pixel, and the shade of each color is adjusted by changing the light intensity. There are millions of shutters in a display. Voltage controls turning shutters on or off. The liquid crystals form thin layers that make up thin plates. These plates allow polarization of the light and control of light passing through the shutters. Improvements in technology have addressed some problems with blurring and response times, and the first commercial LCD televisions hit the market in 1988. By 2004, the first 42" sets were being purchased quickly, and in later years prices dropped. LCD televisions were competitive against plasma sets because they have higher resolutions, and therefore better pictures. By 2007, screen display panel sizes were offered up to 108" in size.

There was some concern with environment effects of the nitrogen trifluoride used in production of LCD screens, as it is a potent greenhouse gas, but critics point out that actual amounts released to the atmosphere are far less than the perfluorocarbon gas that it replaced. LCD televisions remain popular and comprise a large segment of the commercial television set market.   

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