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flat panel displays - Ian Tierson Dr Karim Physics in...

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Ian Tierson 5/6/2009 Dr. Karim Physics in Modern Technology The world of visual display monitors is being developed further everyday. One of the more recent and significant developments is the flat panel display. Flat panel displays are a slimmer and increasingly more attractive alternative to the classic cathode ray tube (CRT) television sets. The principle idea behind a flat panel display is to make the screen a flat panel and thus save space in the consumers’ homes. There are several ways to achieve this. The first is to utilize an organic crystal, discovered in the 19th century by the Austrian botanist, Friedrich Reinitzer. These crystals are composed of molecules that are rod shaped. These rods are easily influenced by finely grooved surfaces; therefore, one can control the alignment, or misalignment, of the molecules. These molecules will transfer light between them and when the have voltage applied o them they align vertically. When perpendicular polarized filters are applied to pieces of glass at opposite sides of the crystals, one can control how much light passes through the crystals. This is because a polarized filter is
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based on the idea that if you have parallel lines you can control the light waves that pass through. Therefore, if these lines are perpendicular then no light will pass through unless it is “bent” or “twisted” between the two filters. This is where the transferal properties of the crystals’ molecules come in.
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