• Go Green: Save Power with LED Technology

    Go Green: Save Power with LED Technology

    Roydon Cerejo, Jun 24, 2009 1330 hrs IST

    Find out if LED technology is really environment friendly

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Expert Review

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One of the main advantages of LED backlighting is low cost, longer life, low operational voltage, immunity to vibration and more precise control over the intensity. There are two methods of implementing this technology; one is Edge lit and the other Array lit. Fortunately we've happened to test both these technologies and see them working first hand.


 




 


First up is the Samsung 40-inch LED TV that uses the Array Lit LED technique. Here the LEDs are mounted uniformly behind the display, which then pass through a diffuser to spread the light evenly. Since there is no cathode lamp, the overall width of the panel is considerably reduced. And because of the array of LEDs, when a dark scene is displayed the LEDs in that area can be dimmed or turned off, thus saving you power and giving you a deeper black. The disadvantage is the slightly more power needed to drive these LEDs as compared to Edge lit.


 




In order to achieve the 'slimmest TV in the world' title, Sony went for the Edge lit technique in the Sony BRAVIA 40-inch LED TV. The LEDs here are mounted on the side and focused on to a diffuser. It consumes lower power and is slimmer, but the backlight is not as even as an Array-lit LCD. You'll clearly notice small patches of light around the edges, especially with a black background.



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Discussion Board
(7) Comments
Sparks
,India, on Jun 26, 2009 07:16 PM
And let me add up, Rather than using these Goofy LCD TVs, Get LCD monitors and a External TV tuner. A 24 inch Full HD panel costs about 15k and eats only 30W of power. On the other hand, even a 26 inch NON HD Stupid LCD TV Costs over twice and eats much more watts!!! These LCD TV brands are just LOOTING US UP.
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Sparks
,India, on Jun 26, 2009 07:11 PM
Mr, Bhavani Prasad, I appreciate your comment- thanks for pointing out the facts. Lets not forget that LED is currently insanely expensive, which washes out all the power savings. And, LED has CRI (colour rendering Index) of 80 or less. CCFL can have over 95 CRI. and good old CRT has 97+ CRI! ha ha. Old is gold.
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Faisal Shaikh
,mumbai, on Jun 26, 2009 11:36 AM
It would have been more interesting to see the difference between SONY LCD, Samsung LCD V/S SONY LED and Samsung LED. Another reson is as per your last article SONY is using the same Bravio engine in its LED model. So it will be interesting to see the actual difference in LDC v/s LED. I am sure you guys will also agree.
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Faisal Shaikh
,Mumbai, on Jun 26, 2009 11:29 AM
It would have been more interesting to see the difference between SONY LCD, Samsung LCD V/S SONY LED and Samsung LED. Another reson is as per your last article SONY is using the same Bravio engine in its LED model. So it will be interesting to see the actual difference in LDC v/s LED. I am sure you guys will also agree.
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Kunal Vyas
,Mumbai, on Jun 26, 2009 10:57 AM
OLED has already come in commercial market in 11" size by SONY. its 1 year more for complete 30" size to hit the market. It is actually the lowest power consuming TV and contrast ratio in millions.
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Bhavani Prasad
,Bangalore, on Jun 25, 2009 03:33 PM
The review fails to consider the initial cost. Second: The LED consumes a lot of energy for its manufacture. Third: The life of LED is definitely more; But the rate of reduction of output with the standard drive is different with different colors. As such LED which is giving white today may give varius different tinge or masking as it ages over a period of 3 years. Eventhough the picture is there it may be seriously difficienmt in color balance as it ages. It is unfortunate that the manufacturers are suppressing the information about the practical or useable life of LED systems. Please consider these aspects and give a complete review.
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Lalatendu
,Bangalore, on Jun 25, 2009 10:01 AM
The LG scarlet 2 has got another energy saving option by which one can save upto 50 % power on normal consumption. If that option is turned off then it is 160 W as mentioned above else it will come to somewhere in the range of 80 W - 100 W, which is again very less !!
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