Monday, December 5, 2011

The Way The LCD TVs Work

By Andrew Johnson

Liquid-crystal display televisions, or LCD TVs, are common televisions which use an uncommon displaying method. Compared to the cathode ray tube televisions, the liquid-crystal display televisions are lighter, thinner, and they have a huge variety of sizes available.

Maybe you remember the old televisions that you used to watch when you were a kid. That kind of televisions are called cathode ray tube televisions. The one you probably have now, the liquid-crystal display television, works with cold cathode fluorescent lamps, that spread light, and so, the colored and black images filter the it. This way, only the needed amount of light is provided, and so, the resulted image is clear, and colorful.

You can just say that sub-pixel is a little part of a pixel. It cannot be seen by humans eye, even if you are close to the screen and you look, you will not make the difference. When you watch TV, you see colors, millions of colors, all at the same time on the same screen. These colors are made of pixel, and each little dot represents a pixel. A pixel is made of several sub-pixel, that combined, form the colored dot that you see on the screen.

The amazing width that the television has is the result of layers made of rod-shaped polymers. The screen is made of such several layers, which are kept together by nematic liquid crystals. It is amazing how the nematic liquid crystals position themselves with materials that got grooves in them. These materials are called directors.

The screens of LCD TVs are basically a big, thin, cybernetic sandwich. This sandwich comprises of a certain number of layers that are placed between two glass sheets, if the screen is over 30 inches, but if it is smaller than 30 inches, the glass sheets are usually replaced with thin plastic sheets. This is the basic the screen that a liquid-crystal display television has.

The polarizing film which the rear sheet starts with, along with the addressing electrodes, the glass sheet, the director, and last but not least, the active matrix components are the lower part of the sandwich. The upper part of the sandwich, or the front sheet, is almost the same, but it has a few differences though. The main difference is the active matrix components, which practically do not exist, because they are replaced by color filters components.

There is a huge obstacle that makes this challenge so difficult, and that is the deposition of the active matrix components. Their failure rate is quite high, this being the reason why the process is a really hard thing to achieve. But this problem was solved, and the prices dropped drastically. Today, many people enjoy their LCD TVs and the good quality images they provide.

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