CCFL-based LCD TVs compared to LED TVs - AVS Forum
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post #1 of 4 Old 11-10-2012, 11:44 PM - Thread Starter
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I decided to buy a new TV for my bedroom to replace the CCFL-based LCD TV that I had there. I didn't want to get an enormous plasma TV so I bought a 32-inch LED TV. I even read somewhere that this TV has a dynamic contrast ratio of 3000000:1-they didn't say what its static contrast ratio is. My old LCD TV had a static contrast ratio of 4000:1, which is pretty good. The new TV is Samsung by the way. This new TV has full-array LEDs, it doesn't have local dimming and it is not edge-lit.

But now I am wondering. I read in Wikipedia that when dynamic contrast is turned on on an LCD, which is an added feature of the TV (LEDs are still LCD technology), when there is even a small super bright object on the TV screen the contrast is affected. So, I guess, even a 3000000:1 dynamic contrast ratio goes out the window. Also, as these new LED TVs have an extremely bright picture, I don't know what happens to the static contrast ratio (which is actually more important).

Of course, LED TVs with local dimming really do have great contrast. But the manufacturers have decided to cheap out and make the other LEDs because local dimming is expensive.
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post #2 of 4 Old 11-11-2012, 01:13 AM
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Those numbers are Dynamic ratios that have been blown out of proportions to entice the ill informed mass consumers into thinking they are getting a far superior product than that which has a less advertised contrast ratio. These are used differently by each manufacturer, therefore this is NOT a universal guideline to compare between different televisions and brand names. It is simply a marketing gimmick, as there is no standard way of measuring contrast ratio.

If anything, native contrast ratios are the more proper way of comparing, which is the ratio of how dark and how bright the display can go simultaneously. (Inherent of the display itself) Dynamic is simply a way to increase one aspect while sacrificing the other. (Like edge dimming, which would decrease brightness to give the appearance of lower blacks but at the expense of a lower bright ratio.)

It's a tough call, professional reviewers can always fluctuate when measuring ANSI ratios. And they also differ from who is the one measuring it and what methods are used. A reviewer might get 4000:1 ANSI ratio rated as excellent, but another reviewer might have 800:1 ratio on the same TV and also call it excellent as well.

Tough life my friend, I know.
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post #3 of 4 Old 11-11-2012, 09:23 PM
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Also keep in mind LED backlight impacts viewing angles negatively, my old CCFL IPS LG set is superb in color reproduction to LED-based Sharp but viewing angles is where I see the difference. All LED sets that I checked from Samsung and LG have major fall off on the viewing angles.
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post #4 of 4 Old 11-11-2012, 09:38 PM
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The 50%-brightness life-time of CCFL is not as long as modern PDP panel. Especially the red colors often drop quickly after 2 ~ 3 years usage. It is almost gone after 5 years usage.

The W-LED's 50%-brightness life-time might not be even on pair with CCFL's. It is still based on Green / Blue color phosphors while only the Red color spectrum is produced by LED.

My PDP is a 5 year's old Hitachi ALiS model, which shows very few color degradation if compared my old CCFL's LCD TV. I can say such phosphor's life time is quite impressive. The old day's PDP (10 ~ 12 years ago) gets almost wash-out colors after 1~2 year's usage.
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