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| The Technology Behind 42-Inch LED TVs |
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.
Description: The Technology Behind 42-Inch LED TVs
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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.
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42 Inch,
LED TV
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