Do 768 LCD's have same banding and clouds issues as 1080p sets - AVS Forum
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post #1 of 9 Old 01-18-2007, 09:02 AM - Thread Starter
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I apologize for asking this question but I've tried to get an answer in two other posts and evidently, my wording was too vague to elicit the answer. I'm unable to determine from my searches if the Sharp, Sony, and Samsung 768p models have the same banding and clouding issues as the 1080p sets. Virtually all the threads are about the newer 1080p models. Or as some have suggested, be safe and go plasma. If anyone could comment on the LCD's, I'd be most appreciative.
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post #2 of 9 Old 01-18-2007, 09:15 AM
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The potential for banding exists on ANY LCD, irespective of size and resolution. Banding (to my understanding) is caused by the backlights being of inconsistent brightness.

(As for resolution & siuze influence ...) It is more likely to be noticeable with a 'black' screen on a larger LCD, and one with more backlights (e.g. my 1080p 42" has 7 backlights, as opposed to some 40" LCDs that had 5, IIRC)

*ashu*
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post #3 of 9 Old 01-18-2007, 09:56 AM - Thread Starter
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Thanks Ashutoshsm for the reponse. That helps me to understand what's going on a little bit better.
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post #4 of 9 Old 01-19-2007, 05:21 PM
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The clouds are nonuniformed pressure from the backlight assembly and/or the enclosure. Size and resolution is not a factor.

With all due respect Ashutoshsm, the fluorescent tubes are not directly the cause.
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post #5 of 9 Old 01-19-2007, 06:11 PM
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Agreed - mine was an overly simplistic explanation

I just implied that the MORE backilghts there are, the higher the possibility, assuming a certain failure/pressure issue percentage, that there may be more banding. So I merely addressed the size/resolution part of it loosely.

Thanks for the clarification.

*ashu*
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post #6 of 9 Old 01-19-2007, 06:20 PM
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Perhaps. When I say it is a uniformity issue I am saying that the LCD as a "light shutter" will do a splotch job at blocking light if the LCD gap (inside the display) is uneven. Given that the gap is only 3-4 micron, it will not take too much pressure from the light guide or enclosure to goof it up.

It is unlikely to spot the actual CCFL light output uniformity.

Clouds are a sign of poor workmanship, not the LCD display.

17 years with the LCD mfg industry and a owner of a Sony V2500. And even I have clouds. I just know where they come from. Turning down the backlight a bit and adjusting the "black" level (contrast) to "hide the problem.

DB
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post #7 of 9 Old 01-19-2007, 10:26 PM
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Quote:
Originally Posted by Capecodhack View Post

I apologize for asking this question but I've tried to get an answer in two other posts and evidently, my wording was too vague to elicit the answer. I'm unable to determine from my searches if the Sharp, Sony, and Samsung 768p models have the same banding and clouding issues as the 1080p sets. Virtually all the threads are about the newer 1080p models. Or as some have suggested, be safe and go plasma. If anyone could comment on the LCD's, I'd be most appreciative.

Don't just be safe ... be better. Go look closely at a reasonably adjusted plasma in lighting similar to your home focusing on PQ. You may come to the conclusion that you no longer need to worry about LCD issues.

Let us know what you see.

Cheers,

Gary
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post #8 of 9 Old 01-20-2007, 04:47 AM
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Quote:
Originally Posted by itigap View Post

Don't just be safe ... be better. Go look closely at a reasonably adjusted plasma in lighting similar to your home focusing on PQ. You may come to the conclusion that you no longer need to worry about LCD issues.

Let us know what you see.

Cheers,

Gary

Just an entirely different set of issues.........

Unless someone has developed the "perfect" flat panel, and has not bothered to tell us, both technologies come with problems/issues.

As for the OP's question - There are many 720/768p sets on the market and in homes today, many more than 1080p sets. If we are not reading about cloud and banding issues from the 720/768p owners I would guess its because they are not experiencing these problems.

BTW "banding" is not limited to LCD technology. Do a search on "banding" in the plasma forum . . you will find page after page of users discussing color banding issues.
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post #9 of 9 Old 01-20-2007, 12:03 PM
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Banding is caused by different levels of BLACK from the different feed on the same screen. Black on the 4:3 area of a 16:9 can be at a different level than the "digital" section on the sides. All technologies can show a difference but LCDs since they are trying to block the backlight to make black, shows up more than plasma.

DB
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