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What is An LCD TV?
Added: (Sat Sep 20 2008)
An LCD TV is a television with an LCD screen. In other words the screen is not CRT or cathode ray tube, but made up of two panes of glass between which is liquid crystal material. LCD technology is also used in wristwatches, computer monitors and calculators. It is popular and practical because it is so much lighter and less bulky than the CRT screen.
It was in 1888 that the study of liquid crystals was first noted. Austrian botanist Friedrich Reinitzer found that the material, cholesteryl benzoate had two separate and distinct melting points. The two different types of LCD are called passive and active. Of the two, active is considered to be the superior display. Each pixel in the active matrix display contains an additional element called a thin film transistor (TFT) to maintain its state between scans.
The passive display has many limitations that the active display does not suffer from. For example the active display can be viewed from an angle of 45%. The active display does however require a more intense light to counteract the opacity of the TFT; gate and source lines used which tend to block some of the light. LCD screens are more expensive because during manufacture there are many that cannot be used due to faulty pixels. The others must then absorb the cost of their manufacture.
Mel writes about lcd tv and laptops to help you stay informed and updated at http://au.shopping.com/xGS-lcd_tv
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Submitted by:
Andrew Kapinga