Panasonic 720p plasma

"Wes Newell" wrote in message
...
On Sat, 12 Sep 2009 08:16:16 -0700, Stewart wrote:

Of
course for many, working under fluorescent lighting with CRT's at
60hz
refresh was quite annoying.

I wouldn't think it would be any more annoying as working under
fluorescent lighting with CRT's at 50Hz in countries where that's
the AC
freq. It may even be worse at 50Hz.

--
Want the ultimate in free OTA SD/HDTV Recorder? http://mythtv.org
My Tivo Experience http://wesnewell.no-ip.com/tivo.htm
Tivo HD/S3 compared http://wesnewell.no-ip.com/mythtivo.htm
AMD cpu help http://wesnewell.no-ip.com/cpu.php

Yeah, I guess staring at a timing light for hours sucks at either
frequency.

" wrote in message
news:aa56f490-2a1a-4125-9a24-

Well, not trying to argue, but the eyes adjust. Like flicker on
American CRTs that we don't notice but drives Euros crazy.

What???
Why would a 60Hz refresh bother a Euro used to 50Hz PAL and SECAM?
Not to mention that modern HD flatpanels refresh at much higher rates.

I lived in Germany from 80-81, and the 50Hz flicker was noticeable.

In article Wes Newell writes:
On Sat, 12 Sep 2009 08:16:16 -0700, Stewart wrote:

Of
course for many, working under fluorescent lighting with CRT's at 60hz
refresh was quite annoying.

I wouldn't think it would be any more annoying as working under
fluorescent lighting with CRT's at 50Hz in countries where that's the AC
freq. It may even be worse at 50Hz.


Remember, folks, the fluorescent lighting flickers at *TWICE* the power line
frequency. The tube lights on both positive and negative half cycles. It is
also on for a lot longer percentage of the cycle each time, so the dark periods
are even shorter.

The 50 Hz CRT has light only 50 times per second, and most of that 1/50 second
is dark.


Alan

On Sat, 12 Sep 2009 22:52:30 -0400, "DockScience"
wrote:

Well, not trying to argue, but the eyes adjust. Like flicker on
American CRTs that we don't notice but drives Euros crazy.

What???
Why would a 60Hz refresh bother a Euro used to 50Hz PAL and SECAM?
Not to mention that modern HD flatpanels refresh at much higher rates.
I lived in Germany from 80-81, and the 50Hz flicker was noticeable.

For me 85Hz flicker is noticeable on my CRT computer monitor.

On Sep 12, 10:10*pm, (Alan) wrote:
In article Wes Newell writes:
On Sat, 12 Sep 2009 08:16:16 -0700, Stewart wrote:

* Of
course for many, working under fluorescent lighting with CRT's at 60hz
refresh was quite annoying.

I wouldn't think it would be any more annoying as working under
fluorescent lighting with CRT's at 50Hz in countries where that's the AC
freq. It may even be worse at 50Hz.

* Remember, folks, the fluorescent lighting flickers at *TWICE* the power line
frequency. *The tube lights on both positive and negative half cycles. *It is
also on for a lot longer percentage of the cycle each time, so the dark periods
are even shorter.

* The 50 Hz CRT has light only 50 times per second, and most of that 1/50 second
is dark.

* * * * Alan

U thought those crappy ballasts were outlawed years ago. The
electronic ballats in our current house and previous house switches
around 20KHz so 40K flickers/second. No more headaches, more efficient
and instant on of the lamps. And the better news is they are not
expensive or difficult to install.

G²

On Sep 12, 10:22*pm, Ken wrote:
snip
For me 85Hz flicker is noticeable on my CRT computer monitor.

CRTs continuously 'paint' the screen with an electron beam. LCDs,
plasmas and DLPs update the display but even if it was a 1 Hz rate, it
wouldn't flicker, it would just be terribly 'choppy'.

G²

In article writes:
On Sep 12, 10:22=A0pm, Ken wrote:
snip
For me 85Hz flicker is noticeable on my CRT computer monitor.

CRTs continuously 'paint' the screen with an electron beam. LCDs,
plasmas and DLPs update the display but even if it was a 1 Hz rate, it
wouldn't flicker, it would just be terribly 'choppy'.

If I remember correctly, Plasma paints in a manner similar to CRT,
doesn't it, though by scanning the address lines. LCD is on all the
time, updated at a defined rate, while DLP also is flickering the whole
screen, though possibly at a rate rather faster than the information
update rate.

Alan

On Sun, 13 Sep 2009 22:47:14 -0700 (PDT), wrote:

On Sep 12, 10:22*pm, Ken wrote:
snip
For me 85Hz flicker is noticeable on my CRT computer monitor.

CRTs continuously 'paint' the screen with an electron beam. LCDs,
plasmas and DLPs update the display but even if it was a 1 Hz rate, it
wouldn't flicker, it would just be terribly 'choppy'.

Not true for plasmas. The intensity (brightness) is varied using a
sort of PWM. The frequency is obviously not so high. There is a
noticable difference in blinking between 50Hz and "100Hz Dual Scan"
versions. This is visible with a still image so it is not due to
motion handling.

Different strategies of blinking the back light are also used in some
LCD models. The objective is to minimise the motion blur that is
created in our eyes when we follow a moving object that jumps from
position to position but stays lit too long at each place.
/Jan

On Sun, 13 Sep 2009 22:47:14 -0700 (PDT), wrote:

For me 85Hz flicker is noticeable on my CRT computer monitor.

CRTs continuously 'paint' the screen with an electron beam. LCDs,
plasmas and DLPs update the display but even if it was a 1 Hz rate,
it wouldn't flicker, it would just be terribly 'choppy'.

Plasmas flicker a lot.
I could never use a plasma screen.

"Jan B" wrote in message
...
On Sun, 13 Sep 2009 22:47:14 -0700 (PDT), wrote:

On Sep 12, 10:22 pm, Ken wrote:
snip
For me 85Hz flicker is noticeable on my CRT computer monitor.

CRTs continuously 'paint' the screen with an electron beam. LCDs,
plasmas and DLPs update the display but even if it was a 1 Hz rate, it
wouldn't flicker, it would just be terribly 'choppy'.

Not true for plasmas. The intensity (brightness) is varied using a
sort of PWM. The frequency is obviously not so high. There is a
noticable difference in blinking between 50Hz and "100Hz Dual Scan"
versions. This is visible with a still image so it is not due to
motion handling.

Different strategies of blinking the back light are also used in some
LCD models. The objective is to minimise the motion blur that is
created in our eyes when we follow a moving object that jumps from
position to position but stays lit too long at each place.
/Jan

Plasma PWM is very high frequency... it used to jam the 30-60khz FSK IR
remote control frequencies until they put IR filters on the screens.