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From: halong on 2 Feb 2010 20:34
On Feb 2, 2:07 am, Beryl <fo...(a)road.net> wrote:
> 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.

Thanks you guys, that make sense now, ...about our little fly
friend ;-)

But I still wonder why it happens way? It's because, I know the video
sent to the LCD is the same as it has been sent to the CRT monitor.
That means, the video is scanned line by line, pixel by pixel, left to
right top to bottom. So, how can the image appears as a still image
at once ?

Hmmm why ?
From: Jasen Betts on 3 Feb 2010 07:07
On 2010-02-03, halong <ccon67(a)netscape.net> wrote:
> On Feb 2, 2:07 am, Beryl <fo...(a)road.net> wrote:
>> 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.
>
> Thanks you guys, that make sense now, ...about our little fly
> friend ;-)
>
> But I still wonder why it happens way? It's because, I know the video
> sent to the LCD is the same as it has been sent to the CRT monitor.
> That means, the video is scanned line by line, pixel by pixel, left to
> right top to bottom. So, how can the image appears as a still image
> at once ?
>
> Hmmm why ?

Remeber the RADAR screens in movies made in the 70s and 80s where the
bright stripe moves around the display leaving behind an image that
gradually fades?

With a TV screen the bright line is horizontal and moves vertically
at a much higer rate and the fading is also much quicker.

the bright line itself consists of a dot produced by the scanning beam,
but as each pass across the screen takes less than 0.1ms I don't think
even the fly can resolve that motion.


with an LCD there's no fading between scans the pixels just update in
order and stay the same until the next update

--- news://freenews.netfront.net/ - complaints: news(a)netfront.net ---
From: halong on 3 Feb 2010 23:15
On Feb 3, 6:07 am, Jasen Betts <ja...(a)xnet.co.nz> wrote:
> On 2010-02-03, halong <cco...(a)netscape.net> wrote:
>
>
>
> > On Feb 2, 2:07 am, Beryl <fo...(a)road.net> wrote:
> >> 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.
>
> > Thanks you guys, that make sense now, ...about our little fly
> > friend ;-)
>
> > But I still wonder why it happens way? It's because, I know the video
> > sent to the LCD is the same as it has been sent to the CRT monitor.
> > That means, the video is scanned line by line, pixel by pixel, left to
> > right top to bottom.  So, how can the image appears as a still image
> > at once ?
>
> > Hmmm why ?
>
> Remeber the RADAR screens in movies made in the 70s and 80s where the
> bright stripe moves around the display leaving behind an image that
> gradually fades?
>
> With a TV screen the bright line is horizontal and moves vertically
> at a much higer rate and the fading is also much quicker.
>
> the bright line itself consists of a dot produced by the scanning beam,
> but as each pass across the screen takes less than 0.1ms I don't think
> even the fly can resolve that motion.
>
> with an LCD there's no fading between scans the pixels just update in
> order and stay the same until the next update
>
> --- news://freenews.netfront.net/ - complaints: n...(a)netfront.net ---


Oh, I see.

So, if I heard you right, each pixel on the LCD screen somehow has its
own memory, or a capacitor to hold up the charge, even the scanning
time or "charging time" for each pixel is just a few nano second
according to the video signal

Hmmm, that's sound possible but I don't know they people make it, or
there's a real memory like DRAM or SDRAM???

Wonder whatever it is...

Thanks,
From: halong on 3 Feb 2010 23:29
On Feb 3, 10:15 pm, halong <cco...(a)netscape.net> wrote:
> On Feb 3, 6:07 am, Jasen Betts <ja...(a)xnet.co.nz> wrote:
>
>
>
> > On 2010-02-03, halong <cco...(a)netscape.net> wrote:
>
> > > On Feb 2, 2:07 am, Beryl <fo...(a)road.net> wrote:
> > >> 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.
>
> > > Thanks you guys, that make sense now, ...about our little fly
> > > friend ;-)
>
> > > But I still wonder why it happens way? It's because, I know the video
> > > sent to the LCD is the same as it has been sent to the CRT monitor.
> > > That means, the video is scanned line by line, pixel by pixel, left to
> > > right top to bottom.  So, how can the image appears as a still image
> > > at once ?
>
> > > Hmmm why ?
>
> > Remeber the RADAR screens in movies made in the 70s and 80s where the
> > bright stripe moves around the display leaving behind an image that
> > gradually fades?
>
> > With a TV screen the bright line is horizontal and moves vertically
> > at a much higer rate and the fading is also much quicker.
>
> > the bright line itself consists of a dot produced by the scanning beam,
> > but as each pass across the screen takes less than 0.1ms I don't think
> > even the fly can resolve that motion.
>
> > with an LCD there's no fading between scans the pixels just update in
> > order and stay the same until the next update
>
> > --- news://freenews.netfront.net/ - complaints: n...(a)netfront.net ---
>
> Oh, I see.
>
> So, if I heard you right, each pixel on the LCD screen somehow has its
> own memory, or a capacitor to hold up the charge, even the scanning
> time or "charging time" for each pixel is just a few nano second
> according to the video signal
>
> Hmmm, that's sound possible but I don't know they people make it, or
> there's a real memory like DRAM or SDRAM???
>
> Wonder whatever it is...
>
> Thanks,

I think it all makes clear now,

http://www.ercservice.com/learning/tft-device-design.html

Thanks guys for sharing your knowledge

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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.
Next: Magnet Damage to LCD