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Difference Between LCD and LED Televisions

lcd_amLCD vs LED Televisions

The LCD television is a flat-panel television which utilizes a Liquid Crystal Display technology. It has two layers of glass which are polarized and stuck together. The liquid crystals are held in one of the layers. These liquid crystals pass, or block the light, to produce images on the screen when the electric current passes through it.

However, the crystals do not produce their own light. The light comes from the series of fluorescent lamps at the back of the screen. There are millions of shutters arranged in a grid, which open and close to release and trap some of the light that is not needed to create images. Then each shutter is paired with a colored filter which produces a sub-pixel. These are so small, that when they combine, they create a single pixel, which appears to be a single spot of color on the screen. With the help of the fluorescent lamps, the images created by the liquid crystals become visible to the viewer.

LCD television produces high image quality. They can be made very thin, which makes them less space-consuming, and the user can hang them anywhere. This makes them appealing to buyers.

LED TV’s are actually very much like LCD TV’s. They also have a flat-screen which utilizes Liquid Crystal Display technology. The only difference is their source of light, which is at the back of the screen. The LCD TV uses fluorescent lamps, and the LED TV uses LED (Light Emitting Diodes).

There are two types of LED backlighting. One is referred to as Edge lighting, and the other is called Full-Array lighting. With the Edge lighting, the series of diodes are arranged along the outside edges of the screen. When there is power, the light is distributed across the screen. Alternatively, in Full-Array lighting, there are several rows of diodes behind the entire surface of the screen. They provide more control over brightness and dimming, because the diodes can be turned on and off independently.

LED TV’s are LCD TV’s with a new backlight system. They are newly developed for LCD’s, because Light Emitting Diodes are said to give more balance in color saturation, and use less power than the fluorescent lamps. LED TV’s are the newest version, and that’s why they are currently more expensive than the standard LCD TV’s.

Summary:

LED TV’s are still LCD TV’s. They are just considered to be the newer LCD TV version because of the new backlight system used. The LED TV uses Light Emitting Diodes, while the standard LCD TV uses fluorescent lamps. Although they both still use Liquid Crystal Display technology. The main difference is the part behind their screen, which is the backlight.


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181 Comments

  1. actually when i gone to reliance digital shop in hubli i found huge difference btwn lcd and led tv’s now i got the thing by reading this page ……thanks 4 sharing

  2. which is good led or lcd?

  3. thank you verrry much for the inofrmation
    especially the movie
    that was great
    now i know what to buy

    keep up the work

  4. Real good and too the point article! Appreciate it, thanks,

  5. thanks for the info.. I’m working in appliance center but still confuse and hard to explain bout the diff. of LED and LCD TV…i thank u, it will helping me to explain more easy to the customers..

  6. Magnificent web site. A lot of useful information here.

    I’m sending it to a few pals ans additionally sharing in delicious. And obviously, thanks for your effort!

  7. explained in very neat and simple manner which was very easy to understand.

  8. Real good…..Appreciate!!!

  9. Thanks for the Info. So that’s why. I bought an Sony LED TV last month and I was surprised in manual it was an LCD TV. I thought i was fooled but now it is making sense LED TV are LCD TV with LED backlights.

  10. Good article with great explanation. Thanks for sharing information.

  11. Thanks……..the explanation is awesome:-)

  12. very nice and satisfactory explanation.

  13. Thanks !
    very useful . once again thanks !

  14. now i know… thanks for d’ info.

  15. LCD vs LED -deceiving vs decieving, article vs artical. Too much television at too little quality reading.

  16. thanks for the info…very useful

  17. GOOD LIVE EXAMPLE. THANKS.

  18. This is very resourceful and down to earth.

  19. Very nicely explained….Thankks

  20. The guestion is…what’s better for our world? I guess LED’s?
    Lesser heat is lesser watts, or am i wrong?

    • helmut groen wrote:

      > The question is…what’s better for our world? I guess LED’s?
      Lesser heat is lesser watts, or am i wrong?

      You are not wrong. The first generation of LCD TVs used as much as a couple of hundred watts of electricity. Behind the LCD panel was a large florescent light, which often looked like a big bright spot that was annoyingly obvious behind the TV’s LCD panel.

      You might have heard, even for general lighting, that florescents — such as the new spiral-shaped CFLs (compact florescent lights) — are already being replaced with LEDs for even better energy efficiency. Also, florescents have a spot of Mercury inside their tubes; multiplied by millions of CFLs, and that’s a bad pollution problem. I have never seen LEDs being named as a pollution hazard, at least not any worse than the general electronics entering the waste stream, but they certainly are not manufactured with mercury.

      Anyway, back to power. At the moment, I’m using an old laptop and a 27″ LED monitor plugged into a power-usage meter. Together, they’re using 65 watts. I have measured the 27″ LED display using 25 watts by itself at normal brightness. Better than LCD’s 100 to 200 watt consumption.

      PS: My power usage meter is a Kill-O-Watt Meter. Search Amazon for item # B00009MDBU The price keeps going up and down; I wouldn’t spend too much more than $25 for one of these. Read the reviews for usage pointers.

      • 200 Watts for an LCD? I have a 37″ HDTV CRT TV, and depending on how much white is on the screen, ranges between 150 & 225 Watts. (I do have one of those kill-o-watt things myself)

        • Turns out I was a bit of on those numbers. It was the 29″ NEC 1024×768 display that was using 200-250 watts. The Mitsubishi Megaview uses 255 to 350 watts, depending on how much white is on the screen. I custom built a stand for it and it weighs about 200lbs. My bro and I lifted it up there. It turns 20 this year and still working fine. Hopefully 4k OLED is cheap by the time the thing fails.

  21. The color and brightness and white level can be changed on either one. You can’t just plug and critique as if that’s the way it is.

  22. thnx for giving me such inf. for my project

  23. Which company’s led is better?

  24. This is very useful…now i buy led thanks.

  25. The best of LED are so emitting display picture is clearly.

  26. Yeah it’s awsm very simply explanation to understand LEd is GooD

  27. Yeah it’s awsm very simply explanation to understand LEd is GooD

  28. remarkable thing………..
    very understable…iii

  29. I wish they would quit calling them “LED” TVs. They aren’t, and there are actual true LED TVs out there. Those signs you see outside of businesses…those are LEDs, true LED where there is no LCD and each pixel does all the lighting.

  30. Nicely explain, thank you.

  31. I feel,both LED & LCD are better

  32. Hi Matt Hill.

    Yeh, the first generation of those LCD TVs was a long time ago, but I remember being surprised and frustrated at how much power they used. One trick I had was to go into a store that sells lots of TVs and put my hand over the back of each one to see which ones were giving off less heat.

    (The other test was to see which display didn’t show a big bright spot in the middle of the screen from the florescent light inside, a problem that LED TVs don’t have.)

    There was more frustration trying to find current-draw specs on the TVs. Sometimes, even going to the manufacturers’ website wouldn’t help uncover the desired data.

    I found one, it’s a 55″ LCD TV, which is a little bigger than what I wanted to use as an example, but. Search Newegg for item # 9SIA9563GP9161 , it’s a “Vizio 55″ Class (54.64″ Diag.) 1080p 120Hz LCD HDTV VF550M” In the specifications, it says is uses 244 watts average.

    I can see you getting the Kill-O-Watt especially for the CRT TV, especially 37″. It sounds like a thing of beauty, but your inquiring mind wanted to know how much power it uses.

    I also remember when a few hundred dollars was a lot to spend on a CRT TV. And then when the LCDs came out, they were a few hundred dollars or even more, and it was hard to justify getting rid of Big Beauty. The LCD’s best selling point was that you get a lot more picture for the same power usage, assuming you got a model that had a good picture.

    Here’s a 55″ inch LED Vizio for comparison, Newegg item # N82E16889262406 . They provide specifications, and they say it’s 59.3W(!). “Power Consumption: 59.3W Standby Power Consumption: <0.5W" Not 59.4, not 59.2., but "59.3." See the significant figures. Feel the significant figures. Love the significant figures. Send an email to the FTC about there being too many significant figures.

    The takeaway is that there are still TVs on the market that use a lot of power and generate a lot of heat and electricity bills, and that might not be desirable for some people, so Power Consumption should be taken into consideration.

    More recently, I read a comment that LCD TVs have better color saturation than LEDs. It's something to research, but I wouldn't get disillusioned about LEDs because of it.

    The plummet in LCD prices took a very long time to happen, dramatic drops didn't happen until the last year or two. Probably will be even more drops on great 1080 LEDs now that 4k TVs have arrived and they're trying to push them, now.

    Also, the 55" Vizo LED (which I pulled out of a hat without doing any comparison shopping) costs $639. (Not $638…) For 55", it wasn't too long ago it would have cost over $2000. Granted, if our brains are calibrated in 1995-dollars, $639 will still seem like an absurd amount of money to spend for a TV. Of course, 1995 is getting to be a long time ago.

    When the time comes to move your 37" TV, call a moving company and ask for a couple of strong guys to help. It's not worth the hernia, and the arthroscopic surgery, etc.

  33. The explanation given is excellent for even an lay man to understand. I look forward to see more such articles.

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