Re: Plasma burn-in
- From: "alien" <nofenders@xxxxxxxxxxxxxxx>
- Date: Thu, 14 Feb 2008 21:29:54 GMT
"G-squared" <stratus46@xxxxxxxxx> wrote in message
On Feb 14, 10:37 am, "www.locoworks.com" <videoc...@xxxxxxx> wrote:
Old tube-type television cameras had a similar problem and a
solution. If a camera had inadvertantly shot a light, or sat on anfocus,
art card for a long time, the image would be burnt in to the tubes.
To fix the problem, the camera was put on a white card, out of
with the iris opened up. After a while, the image was burnt off ofimage,
Since nothing good is without bad consequences, this fixed the
at the expense of tube life, similar to your scrolling loop fix,
removing the burn in at the expense of two hours of screen life.
When I worked at the TV station from '76 to '85, we would sometimes do
just that. Later when I did camera alignment at Sony and worked with a
guy who had worked for Amperex (major manufacturer at the time) in the
camera tube division, I found that the white card trick was an urban
myth and simply hastens the demise of the tubes. During alignment of a
new set of tubes which would be on the chart for about 2 hours, there
would be a retained image and the customer was sometimes a little
concerned. Turned off in the storage case it was always gone by the
If I had a plasma, I would never try to 'fix' it with a flat white
field. If it doesn't go away in a few days, well, that's what they do.
The suggestion of a 'break-in' period is a good one.
My Dell 42" plasma has a setting called "plasma conditioning" that IS, as
far as I can tell, a blank white screen. I ran it for about a half hour a
couple of months ago. Not because there was a problem, I just wanted to see
what it did. The TV is 18 months old and still looks great. It does get
image retention when viewing 4:3 and switching to 16:9. You can see a faint
line for about 30 seconds or so and then it disappears.
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