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| 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 are television sets that use LCD technology, just like in the computer LCD monitors, tuned up for video and television display. Many features of LCD Television rendered it more practical than CRT TVs and thus LCD TVs began to gain instant popularity among the consumers.
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 are referred to as "transmissive display", because light is not emitted by the liquid crystals themselves. A light source behind the panels emits light that gets redirected by a white panel to the rear of LCD, which distributes the light evenly to generate uniform image. This is the basic principle behind the working of LCD televisions.
The LCD TV display has a liquid crystal solution sandwiched between two polarizing transparent crystals. In order to form a template for the liquid crystal, the front layer glass of the display is etched on the inside in a grid pattern. These crystals bend light in response to an electric current and each crystal behaves like a shutter either allowing light to pass through or blocking it. So a pattern of dark and transparent crystal are formed that generates the image.
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 per fluorocarbon gas that it replaced. LCD televisions remain popular and comprise a large segment of the commercial television set market.
LCD televisions have their own set of advantages and disadvantages. The LCD TVs do not have a rapid pixel response time and thus in cases of fast moving objects exhibit motion lag. Improvements have been made to overcome this defect, however this works only if your screen size is lesser than 35 inch. The bigger the screen gets, fast action videos create more of ghosting effect and they video becomes highly indistinct. Since LCD TVs use LCD panels, many LCD televisions do not have the capacity to go fully black, rather blacks appear to be darker gray.
LCD TVs are also quite expensive compared to their CRT counterparts. Especially when it comes to sizes over 35 inch and the ones with a 16:9 aspect ratio are very expensive. However with continuous research and improvement, the manufacturing price of the LCD televisions fell and eventually LCD TVs began to dominate the market.
Though LCD TVs suffer quite a few drawbacks, there are more advantages that cancels out the few imperfections. The major and obvious advantage is that LCD televisions are easier to watch. LCDs offer more brightness and contrast than CRT televisions and perform well under almost every light atmosphere. Even under bright light ambiance, the images of the display do not appear washed out. Also, the display does not suffer glare due to surrounding lights. Since most flat screen LCD television displays can have a viewing angle of 160 degrees, the video will look agreeable from anywhere under 80 degrees on both sides.
Unlike plasma televisions, you will not have to worry about image burn-in, ideal for gaming usage. This is because colors are created using filters and the display screen is not coated with phosphor dots. Also LCD televisions are multifunctional; you can use them either as an HDTV player, home video player or as a monitor for your PC.
Description: LCD Televisions
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ItemReviewed: LCD Televisions
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 are referred to as "transmissive display", because light is not emitted by the liquid crystals themselves. A light source behind the panels emits light that gets redirected by a white panel to the rear of LCD, which distributes the light evenly to generate uniform image. This is the basic principle behind the working of LCD televisions.
The LCD TV display has a liquid crystal solution sandwiched between two polarizing transparent crystals. In order to form a template for the liquid crystal, the front layer glass of the display is etched on the inside in a grid pattern. These crystals bend light in response to an electric current and each crystal behaves like a shutter either allowing light to pass through or blocking it. So a pattern of dark and transparent crystal are formed that generates the image.
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 per fluorocarbon gas that it replaced. LCD televisions remain popular and comprise a large segment of the commercial television set market.
LCD televisions have their own set of advantages and disadvantages. The LCD TVs do not have a rapid pixel response time and thus in cases of fast moving objects exhibit motion lag. Improvements have been made to overcome this defect, however this works only if your screen size is lesser than 35 inch. The bigger the screen gets, fast action videos create more of ghosting effect and they video becomes highly indistinct. Since LCD TVs use LCD panels, many LCD televisions do not have the capacity to go fully black, rather blacks appear to be darker gray.
LCD TVs are also quite expensive compared to their CRT counterparts. Especially when it comes to sizes over 35 inch and the ones with a 16:9 aspect ratio are very expensive. However with continuous research and improvement, the manufacturing price of the LCD televisions fell and eventually LCD TVs began to dominate the market.
Though LCD TVs suffer quite a few drawbacks, there are more advantages that cancels out the few imperfections. The major and obvious advantage is that LCD televisions are easier to watch. LCDs offer more brightness and contrast than CRT televisions and perform well under almost every light atmosphere. Even under bright light ambiance, the images of the display do not appear washed out. Also, the display does not suffer glare due to surrounding lights. Since most flat screen LCD television displays can have a viewing angle of 160 degrees, the video will look agreeable from anywhere under 80 degrees on both sides.
Unlike plasma televisions, you will not have to worry about image burn-in, ideal for gaming usage. This is because colors are created using filters and the display screen is not coated with phosphor dots. Also LCD televisions are multifunctional; you can use them either as an HDTV player, home video player or as a monitor for your PC.
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1 Respones to "LCD Televisions"
led and lcd televisions.
I truly like to read your LCD Televisions.Thank you so much for taking the time to share such a nice information.
August 27, 2013 at 11:17 PM
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