Senin, 23 Januari 2012

Technology Behind LED TVs and why they are the best choice

More buyers are now choosing LED TVs, particularly the very popular 42" LED TVs. Their picture quality rivals (some say even surpasses) the very best that plasma TVs can offer, at a more efficient level of energy consumption. A 42" LED TV is also superior to the standard LCD TV in terms of overall picture quality.What gives a 42" LED TV an edge is, of course, the more sophisticated LED technology. "LED" refers to light emitting diodes, which provide illumination to the display and produce the picture. LEDs are better than the cold cathode fluorescent lights (CCFLs) found in standard LCD TVs, in that they deliver better, more vivid images.In addition, some 42" LEDs have a feature called "local dimming." This means that when a picture in a scene requires it, some LEDs are turned off completely. As a result, some parts of the screen are in total darkness while others continue to be lit. This produces very dramatic, deep blacks. An LCD TV is simply incapable of this, because the fluorescent light tubes are always on, and so the blacks in a picture are never completely black.

There are two ways that the LEDs may be laid out at the back of a 42" LED. In "full-array" configuration, the LEDs are laid out behind the entire display. In the "edge-lit" configuration, the LEDs are placed only on the sides or edges of the panel. But still, even if only edge-lit, the lighting can reach all parts of the display including the middle, using what are called "light guides".Thus, some 42" TVs may be full-array with or without local dimming, while others may be edge-lit, again with or without local dimming. The most common in the market are those that are edge-lit without local dimming, which are also the thinnest models. The ones that perform best are the full-array with local dimming type, the original type of LED TVs that came out.Buying a TV has become a lot more complicated than it was years ago. There are so many things to consider, starting with what kind of TV to get. Should one go for LCD or plasma? LED or OLED? And what size is best? Which brand stands out from the rest?The latest TV technology is the OLED, or Organic Light Emitting Diode. 

OLED TVs are the thinnest and offer the best picture quality, but they are the most expensive as well. Their life span is also not as long as that of other TVs, hence an OLED TV is not a very practical choice...unless you don't mind throwing away a hefty sum of money for something that's excellent but won't last very long.Next are the LED TVs, less pricey but a cut above standard LCD TVs. LED stands for Light Emitting Diode, referring to the light used to illuminate the screen and produce a picture. Standard LCD TVs use fluorescent tubes, which give limited color saturation with no deep blacks.With 42-inch LED TVs, you get very clear and crisp pictures, with wide color variety and superb contrast. Compared to their LCD and plasma counterparts, they are also more energy efficient.All things considered, 42-inch TVs are the best choice. They provide excellent picture quality at reasonable prices. True, they are usually more expensive than LCD TVs, but the enhanced picture quality is worth the extra dollars.Many brands offer their own models of 42-inch TVs. The top sellers are Samsung, Sony, LG and Vizio. Samsung's 42-inch TVs are stylishly thin, and they are among the most highly recommended.

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