Difference between CRT, Plasma , LCD and LED TV And How do they work

 There are different technology of Televisions are provided in market like Plasma TV, LCD TV and LED TV etc. Here in this post i will try to differentiate between all these TV technology which will help you to choose the best TV technology.
 

•  There was a time when all TVs contained a cathode ray tube (CRT) and, as a result, were bulky and heavy. CRT TV  work by firing a stream of negatively charged particles, called electrons, at a phosphor screen. When an electron strikes a phosphor atom, the atom becomes excited and emits light of a certain colour, hence creating one picture element, or “pixel”, of a TV picture.

These boxy sets take up a lot of space, cannot be viewed clearly from all angles and don’t display high-definition picture. I agree that the CRT TV dominated the market in the second half of the 20th century, but the search for a thinner, lighter and more energy efficient alternative dramatically reduce the demand of CRT TV.

 

• Plasma TV technology is same as basic principle of CRT TV insofar as it relies on excited phosphor atoms to produce each pixel of a TV picture. However, instead of using a CRT, a plasma TV screen lights each pixel with a hot, ionized gas, consisting of atomic nuclei and electrons. This method allows every pixel in the display to be turned on or off at the same time and the absence of a CRT means that plasma TVs can be much thinner and lighter than their CRT counterparts.

Plasma televisions have excellent picture quality and use less electricity than traditional CRTs. The colors are very sharp and the televisions also display very deep blacks. The screen can sometimes experience a “color burn” if they get a lot of use. When the television is turned off, a shadow of images may stay on the screen, and the color may be slightly faded in the areas that are burned. One of the primary drawbacks of plasma technology is its cost. These TVs are somewhat heavier than others of their kind. They are also prohibitively expensive to repair and sometimes cannot be repaired at all. Plasma TVs also look much better in low light than in bright light.

•  liquid crystal display (LCD) TV technology, although  LCD panels don’t, by themselves, generate any light of their own. Liquid crystal molecules twist and untwist when a voltage is applied or removed, so they’re simply used to regulate the passage of light from a traditional light source. If light is allowed to pass through a particular pixel, the pixel is “on” and appears light on the TV screen; if not, the pixel is “off” and appears dark.

LCD TVs are a good choice for people looking for an affordable HDTV. They have a much better picture quality and they’re relatively light-weight. They’re also ideal for watching television in any light condition; they work equally well in dark or well-lit rooms. One problem that some people have with LCD technology is that it is limited when compared to other types of HDTVs. The display has a low contrast ratio, and there is no way to get “true” black on the screen. This leads to LCD TVs having a slightly washed-out look that some people do not like. Additionally, some of the crystals in the display can burn out, leading to “dead pixels” on the screen. These blank flecks are irreparable and can be very distracting.

 

• The latest type of HDTV use LED technology, known as light emitting diode (LED) TV is actually a special case of LCD TV. An LED is a tiny electronic device that emits light when a current passes through it. LEDs can be used to light LCD panels, either by means of an array positioned directly behind the panel or by housing them on the sides of the screen.

LED TVs have better color contrast and brightness than other type of TV technology. The display is bright enough to watch in any light. They also draw less power than either LCD or plasma displays, and the energy efficiency helps to compensate for the technology’s fairly high cost.
The greatest drawback of an LED TV is its cost. Because the technology is new, it is more expensive than its competition. Additionally, LED TVs still sometimes suffer from the “dead pixel” issue that haunts LCD screens.


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