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From: halong on 1 Feb 2010 17:33
In the old day when we point the camera at a CRT monitor we see hum
noise, something like horizontal bars rolling up/down

Today when pointing the same camera at the LCD monitor we don't see
such thing anymore

Why ?

From: Sjouke Burry on 1 Feb 2010 21:57
halong wrote:
> In the old day when we point the camera at a CRT monitor we see hum
> noise, something like horizontal bars rolling up/down
>
> Today when pointing the same camera at the LCD monitor we don't see
> such thing anymore
>
> Why ?
>
Because the pixels are dead slowly switching, compared to a crt.
The crt pixel fades in milli(?micro)seconds, and thats the reason
for the bad videocamera picture.
The slow pixels in lcd displays are responsible for badly visible
fast moving things on screen.
From: halong on 1 Feb 2010 22:17
On Feb 1, 8:57 pm, Sjouke Burry <burrynulnulf...(a)ppllaanneett.nnll>
wrote:
> halong wrote:
> > In the old day when we point the camera at a CRT monitor we see hum
> > noise, something like horizontal bars rolling up/down
>
> > Today when pointing the same camera at the LCD monitor we don't see
> > such thing anymore
>
> > Why ?
>
> Because the pixels are dead slowly switching, compared to a crt.
> The crt pixel fades in milli(?micro)seconds, and thats the reason
> for the bad videocamera picture.
> The slow pixels in lcd displays are responsible for badly visible
> fast moving things on screen.

we don't talk about the motion video. I recall in the old RCT monitor,
even with still images there's also rolling hum-noise.

In other words, if a fly watches the LCD monitor what would the fly
seeing ?

Ps. the fly'eyes can see much faster than human eyes

From: Sjouke Burry on 1 Feb 2010 22:49
halong wrote:
> On Feb 1, 8:57 pm, Sjouke Burry <burrynulnulf...(a)ppllaanneett.nnll>
> wrote:
>> halong wrote:
>>> In the old day when we point the camera at a CRT monitor we see hum
>>> noise, something like horizontal bars rolling up/down
>>> Today when pointing the same camera at the LCD monitor we don't see
>>> such thing anymore
>>> Why ?
>> Because the pixels are dead slowly switching, compared to a crt.
>> The crt pixel fades in milli(?micro)seconds, and thats the reason
>> for the bad videocamera picture.
>> The slow pixels in lcd displays are responsible for badly visible
>> fast moving things on screen.
>
> we don't talk about the motion video. I recall in the old RCT monitor,
> even with still images there's also rolling hum-noise.
>
> In other words, if a fly watches the LCD monitor what would the fly
> seeing ?
>
> Ps. the fly'eyes can see much faster than human eyes
>
The fly would only have a problem with the crt.
From: Beryl on 2 Feb 2010 03:07
halong wrote:
> On Feb 1, 8:57 pm, Sjouke Burry <burrynulnulf...(a)ppllaanneett.nnll>
> wrote:
>> halong wrote:
>>> In the old day when we point the camera at a CRT monitor we see hum
>>> noise, something like horizontal bars rolling up/down
>>> Today when pointing the same camera at the LCD monitor we don't see
>>> such thing anymore
>>> Why ?
>> Because the pixels are dead slowly switching, compared to a crt.
>> The crt pixel fades in milli(?micro)seconds, and thats the reason
>> for the bad videocamera picture.
>> The slow pixels in lcd displays are responsible for badly visible
>> fast moving things on screen.
>
> we don't talk about the motion video. I recall in the old RCT monitor,
> even with still images there's also rolling hum-noise.

LCD monitors don't refresh the screen like CRTs do, they don't need to.

I used the highest refresh rate available with my CRT monitor, 85 Hz.
That made the flicker imperceptible (except to a camera that
periodically blinks at the same time that a horizontal line on the
screen does).

With my LCD, I use the lowest, 60 Hz.

> In other words, if a fly watches the LCD monitor what would the fly
> seeing ?

A steady image.

> Ps. the fly'eyes can see much faster than human eyes

Then the fly sees the CRT like rows of strobe lights.
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Prev: Essentials of Modern Business Statistics 4th Edition 2009 . Anderson, Sweeney Solution manual and Test Bank is available at affordable prices. Email me at allsolutionmanuals11[at]gmail.com if you need to buy this. All emails will be answered ASAP.
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