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What is the difference between LCD and LED TV?


An LCD and LED screen are the same functionally. The LC in LCD is liquid crystal, which means a silicon crystal that moves when an electrical signal is applied. In this case, it twists when a signal is applied. Two crystals together then form a prism, with the color coming out of the prism being determined by how much the crystals twist. This then forms a pixel of a certain color, based on the signal applied.

 The difference between an LED and LCD screen is the back light behind the screen that generates the light that comes out of the prisms. An LCD screen uses a diffused bright white fluorescent lamp. An LED screen uses an array of bright white LEDs. The advantages are: If the fluorescent lamp burns out, the entire picture goes away (just black screen). But, if one LED goes out, you may not even notice it. The LEDs have much better even coverage across the screen. They also use a lot less energy, don't get as hot, and allow for a much thinner and lighter TV set.

 An LED is probably about 20% more expensive than an LCD TV. But, eventually, that will be the standard and you probably won't be able to even purchase an LCD TV any more.

 Summary:

  • LCD: Fluorescent back light
  • LED: LCD with White LED back light

Comments

  1. UnknownDecember 11, 2012 at 11:51 AM

    Actually LED is also a type of LCD but it's just improved version. Both are good as LED is expensive than LCD so it's little better than LCD.
    -------------------------------------
    Scootercity

    ReplyDelete
  2. Tech AdminDecember 11, 2012 at 12:17 PM

    http://pnperl.blogspot.in/2012/05/three-minute-tech-amoled.html

    ReplyDelete

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