Does your display have this issue too? We need your help! - AVS Forum
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post #1 of 9 Old 12-02-2008, 05:22 AM - Thread Starter
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The question is simple: take a step back and squint your eyes, does your TV or PC screen display the following pattern as more or less faint grayish bars or does it display it as differently-colored bars?

(if your display has trouble displaying the test pattern or if you prefer JPEG files, use the 1080p alternate pattern or the 720p alternate pattern)

I'd like to create a comprehensive list of what displays pass or do not pass this test.

List of displays who FAILED the test:
  • [plasma tv] Panasonic PZ81E (dark Green-dark Cyan-Yellow)

List of displays who PASSED the test:
  • [plasma tv] Pioneer PDP-5020
  • [lcd tv] LG 32LB9B
  • [lcd monitor] various laptops: multiple Toshiba, Apple MacBook, Acer Aspire
  • [lcd monitor] Dell Studio 1535
  • [crt monitor] Panasync E50i

Please perform the test and report the results in this thread, I'll try to keep this list updated.

(note: for technical details visit this other thread I created in the plasma section)

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post #2 of 9 Old 12-02-2008, 08:57 AM
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Quote:
Originally Posted by hocifer View Post

The question is simple: take a step back and squint your eyes, does your TV or PC screen display the following pattern as more or less faint grayish bars or dose it display it as differently-colored bars?

I'd like to create a comprehensive list of what displays pass or do not pass this test.

List of displays who FAILED the test:
  • [plasma] Panasonic PZ81E (dark Green-dark Cyan-Yellow)

List of displays who PASSED the test:
  • [lcd] Various Toshiba laptops
  • [crt] Panasync E50i

Please perform the test and report the results in this thread, I'll try to keep this list updated.

(note: for technical details visit this other thread I created in the plasma section)

That seriously looks weird on my 5020, it looks almost like it's trying to lock on to it and the pattern gets progressively dark and lighter for a few seconds. Once it's done the bars are light gray.

Be a fan of displays, not companies or technologies!
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post #3 of 9 Old 12-02-2008, 01:08 PM - Thread Starter
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Thanks You can use this pattern if your screen struggles with displaying fine details:

The drawback is that you will have to squint your eyes more because of the coarser structure... if you have trouble doing that you can try taking an out-of-focus photo with a manual focus camera.

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post #4 of 9 Old 12-02-2008, 02:29 PM
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my macbook screen passes! woo
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post #5 of 9 Old 12-03-2008, 08:26 AM
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The screen of my crappy Acer Aspire 3680 laptop at work passes
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post #6 of 9 Old 12-03-2008, 11:45 AM
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Quote:
Originally Posted by hocifer View Post

The question is simple: take a step back and squint your eyes, does your TV or PC screen display the following pattern as more or less faint grayish bars or does it display it as differently-colored bars?

Perhaps another thread or poll is needed to keep track of whether people watch test patterns or movies, sports and TV shows.

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post #7 of 9 Old 12-03-2008, 01:01 PM
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Dell Studio 1535 with 1900x1200 panel passes
LG 32LB9B passes

and the real life equivalent would be what? or is this just for bragging rights that "A" can do a test pattern and "B" cannot? and just to really make this "poll" meaningful you also will need the build dates for all the sets as running production changes may change the results.

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post #8 of 9 Old 12-03-2008, 01:02 PM
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Quote:
Originally Posted by Doug Blackburn View Post

Perhaps another thread or poll is needed to keep track of whether people watch test patterns or movies, sports and TV shows.

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post #9 of 9 Old 12-03-2008, 04:54 PM - Thread Starter
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Thanks people for taking the time to do the test, it's very helpful! Looks like this is a rather isolated problem... (although D-Nice did report that his display had similar issues, which prompted me to do a broader search for affected displays)

Some people have asked me to provide JPEG files for use in TVs, I added them to the first post. They should be relatively immune to poor cabling or deinterlacing.


In general, I agree that test patterns are not necessarily representative of reality. For example, my TV blinks considerably when displaying certain pixel patterns, and clearly they never happen in normal programming so this is not an issue at all and nobody in their right mind should pay attention to such theoretical junk. But the test pattern I gave is not in that kind of league, because the underlying problem is really serious and has an impact on everyday viewing. In the case of the PZ81, this means washed out grays and "fluorescent" reds in dark areas of the picture, and bright whites contrasting with dark blues in bright areas of the picture. The reason for providing a test pattern is that you can't ask people to look for this issue and hope that the results will be reliable -- therefore the test pattern is a very convenient way for everybody to be able to objectively measure the behaviour of their TV so that we can map out the full extent of the problem. The pattern is just a means, not an end.

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