----- HDTV Magazine Tips List -----
Most units I have sold have had that for awhile. It can be turned on or off.
-----Original Message-----
From: Dan Vining
Sent: Wednesday, August 17, 2005 10:37 PM
To: HDTV Magazine
Subject: Re: Lots of Good HD Info
----- HDTV Magazine Tips List -----
Most new plasma displays also use an image shifting technology that shifts
the image in a manner that is not visible to the naked eye but supposedly
helps prevents burn in. But it can't shift image enough to prevent static
images from burning in that are displayed for long periods of time it simply
helps to blur the burn in by the amount of pixel shifting that it does.
------------------------------------
Vining Audio & Video
Daniel R. Vining
LLC Member
[email protected]
30 Spring Street
Danbury, CT 06810
www.viningaudio.com
------------------------------------
-----Original Message-----
From: HDTV Magazine On Behalf Of
Steve Martin
Sent: Wednesday, August 17, 2005 10:01 PM
To: HDTV Magazine
Subject: Re: Lots of Good HD Info
----- HDTV Magazine Tips List -----
It just occurred to me that the fact that the black level had
increased over time may actually be "burn in". Since they likely
kept a non static image going on the screen for the 4 weeks, that
gradually raised the overall black level of the display by "burning
in" every pixel evenly (perhaps even just the short term type of
image persistence I was talking about. I wonder if they turned it of
for a few days, then remeasured, perhaps the original black level may
have been restored.
On Aug 17, 2005, at 8:55 PM, Hugh Campbell wrote:
> ----- HDTV Magazine Tips List -----
>
> Thanks Steve, that's pretty much what I concluded in a layman's
> fashion from reading the report. I always thought the burn in
> problem was caused by a continuous exposure to a condition (like a
> logo) rather than just a quick exposure followed by no exposure.
>
> Hugh
>
>
> ----- Original Message ----- From: "Steve Martin"
> <
[email protected]>
> To: "HDTV Magazine" <
[email protected]>
> Sent: Wednesday, August 17, 2005 9:41 PM
> Subject: Re: Lots of Good HD Info
>
>
>
>> ----- HDTV Magazine Tips List -----
>>
>> There are so many things wrong with that report that I don't know
>> where to begin.
>>
>> They counter image persistence issues with a study that shows that
>> if you "wash it" with 24 hours of moving image, no persistent
>> image is visible. One problem I have with most plasma's is images
>> that persist for 30 seconds or so after a static image has been
>> displayed for a similar amount of time, that was not addressed.
>> When I calibrate, I often put up a white window and then
>> afterward a black screen. The white window can take a while to
>> fade out. I'm also really not sure what their test shows with
>> regard to burn in of things like station logos that happen over
>> months.
>>
>> They address light output lifespan with two data points. Brand
>> new and 4 weeks later. Then make lifespan claims. With out more
>> data points we know very little about how fast they initially
>> dimmed and then how much it leveled off or not. The lamp based
>> displays can have their lamps replaced and return to their
>> original brightness which is not an option for the plasmas and
>> amazingly not mentioned. For all we know in their test, the lamp
>> based displays lost all their brightness the first day and
>> flattened out, while the plasma stayed steady for a couple of
>> weeks and then started dropping fast. One will never know from
>> their test.
>>
>> They say the black level is darker than the "reference CRT"
>> display but never quote any numbers from the "reference CRT".
>> They indicate the black level INCREASED over time on the plasma
>> display. That sounds very unlikely and is worthy of further
>> investigation. It is frightening to think the black level is
>> getting worse over time (lighter) as the brightness is
>> decreasing. Do they meet in the middle at some point?
>>
>> I have yet to comprehend what they are talking about with regard
>> to color accuracy at varying saturation levels, etc. It sounds
>> like they have detected varying levels of non-linear color
>> decoding on the various sets. That is a design/implementation
>> issue that I wouldn't think would be technology related, but
>> again, it is hard to tell exactly what they were testing.
>>
>> At least the viewing angle tests and color purity across the
>> screen tests seemed reasonable.
>>
>> Pioneer is placing a lot of eggs in the plasma basket. Pioneer
>> funded the study. Draw your own conclusions.
>>
>>
>>
>> On Aug 17, 2005, at 8:13 PM, Hugh Campbell wrote:
>>
>>
>>> ----- HDTV Magazine Tips List -----
>>>
>>> The link posted below includes a "white paper" on a series of
>>> tests done on plasma, LCD and microdisplay screens regarding
>>> black levels and burn in to name a couple. I hope that someone
>>> will read this over and confirm or rebuke what the tests appear
>>> to "prove". It seems that burn in and black levels are not a
>>> problem with the newer plasma sets. This was prepared for
>>> Pioneer....gee what a surprise.
>>>
>>> Hugh
>>>
>>>
>>> ----- Original Message ----- From: <
[email protected]>
>>> To: "HDTV Magazine" <
[email protected]>
>>> Sent: Wednesday, August 17, 2005 8:16 PM
>>> Subject: Lots of Good HD Info
>>>
>>>
>>>
>>>
>>>> ----- HDTV Magazine Tips List -----
>>>>
>>>> _http://broadcastengineering.com/newsletters/hd_tech/20050817/_
>>>> (
http://broadcastengineering.com/newslet ... /20050817/) #
>>>>
>>>>
>>>> Good HD reading!!
>>>>
>>>>
>>>> Enjoy...
>>>>
>>>>
>>>> Don, W4WJ
>>>>
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>>
>> --
>> Steve Martin
http://www.cheezmo.com/
>> Smart Calibration, LLC
http://www.smartcalibration.com/
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--
Steve Martin
http://www.cheezmo.com/
Smart Calibration, LLC
http://www.smartcalibration.com/
The Widescreen Movie Center
http://www.widemovies.com/
Letterboxed Movie TV Schedule
http://www.widemovies.com/lbx.html
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