Tuesday, August 22, 2017

What is LED TV


Liquid crystal displays (LCDs) are present in all manner of electronic devices nowadays, mobile phones, digital cameras and, in particular, TVs. All LCD screens require a backlight to provide the light to illuminate the picture.
Until recently these backlights have used cold cathode fluorescent lamps (CCFLs). However, new LED TVs use light emitting diodes (LEDs) to provide the backlight and therefore differ significantly from ordinary LCD TVs.

Even in LED Televisions the TV still has an LCD panel, so although they are often only referred to as LED TVs, this really only refers to the technology of the backlight. The advantages of using LEDs to provide the backlight over CCFLs is that an LED-backlit LCD can produce a brighter picture, with more vivid colours and significantly better blacks in comparison to a standard LCD.

LED TVs consume less power

Furthermore, the power consumption of an LED TV is significantly less than that of standard CCFL LCD TV. This not only saves you money on your electricity bills, but also means that the TV is better for the environment and reduces your carbon footprint. Obviously it varies from set to set, but the energy saving is estimated to be around 40% in comparison to a standard CCFL LCD TV of the same size.

Blacker Blacks and Crisper Whites

Most of the improvement in viewing pleasure that is achieved from LED TV is due to the improved contrast ratio in comparison with standard LCD TV. To put this in more intuitive terms, think about what your LCD TV looks like when it is on, but it has no signal. Your answer is that it displays a black screen. Although this is true at first glance, if you take careful note you will see that there is a significant glow coming from CCFL behind the LCD panel and in reality the screen is grey not black – just compare it to the frame of your TV set, which is likely to be truly black.
It is almost impossible to display a pure deep black on a standard LCD because of this problem and, as such, TV personalities always appear to be wearing grey suits, not black ones and dark corners in games and films are grey and you can’t make out the detail in them. LED TV does not suffer from this problem so it has a much better contrast ratio and therefore can represent much better blacks as well as more vibrant colours.

Edgelit or Backlit LED Televisions

There are currently two types of LED TV, Full LED and Edge LED. The difference is in the location of the LEDs, either all over the panel (Full) or around the edges (Edge). The advantage of the Full LED is that the power consumption is slightly lower and it is a simpler method. Edge LED makes it more difficult to achieve a uniform picture on the screen, but enables the manufacture of ultra-thin TVs of around one-inch in thickness.

Conclusion

LED TV is basically a misnomer, it should really be called LED-backlit LCD TV, as that is what it actually is. Whatever it is called, it is an advancement over standard CCFL LCD TV, particularly in terms of contrast ratio and power consumption, as such it is likely to represent the future direction of LCD TV production.

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Comments

8 Responses to “What is LED TV”
  1. Nikhil Borkar says:

    Does LED TV have the Burn in Problem?

  2. admin says:

    The same applies to LED lit TV’s as they do to standard LCD panels in that they do not suffer from Burn In.
    Burn In is a problem that is associated with plasma screens.

  3. TJM says:

    Although edgelit allows thinner TV’s, is this likely to lose out to the “better” picture of backlit.

  4. admin says:

    It seem a bit of a trade off at the moment. I am sure that as LED technology progresses slimline sets with full backlighting will be available.

  5. Rich says:

    Does led get dead and stuck pixels like lcd?

  6. admin says:

    LED tellys are basically LCD panels with LED backlighting, so to answer your question, it is possible that LED panels may suffer also, but if you buy any TV, be it LCD of LED backit if there are any apparent dead or stuck pixels then the panel is at fault and should be replaced under warranty.

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