A
Arpan
Do screensavers prolong the life of PC monitors? If yes, is the effect appreciable?
Thanks,
Arpan
Thanks,
Arpan
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B
Bob I
Nope, they are now "entertainment". They originally were useful to
prevent image "burnin" on "long persistence phosphor" screens. Monitors
are now much less susseptable to this and so screensavers are just
pretty now. (the security aspect is a side effect that is better
acomplished by locking the desktop)
prevent image "burnin" on "long persistence phosphor" screens. Monitors
are now much less susseptable to this and so screensavers are just
pretty now. (the security aspect is a side effect that is better
acomplished by locking the desktop)
G
Guest
Hi,
In the old days, monitors had a screen made of phosphor which emits light
when struck by electrons. The monitor had an electron gun at the back which
fired electrons on areas which had to be 'lit'. When an electron hits the
screen it glows in the form of a dot. Many such dots can form your lines and
curves.
So if a particular area of the screen were to be left lit for a long time,
the phosphor in the lit area would get sort of 'used up' leaving that area to
appear darker permanently.
In order to "save" these old-day "screens", screensavers were invented,
which wil animate the screen to prevent such darkening.
Modern day screens (such as LCD) do not require such protection. In fact
screensavers have now evolved into a form of fancy for many users.
Shijaz Abdulla
B.Tech(IT), MCSE, MCDBA, CCNA, MCSD
In the old days, monitors had a screen made of phosphor which emits light
when struck by electrons. The monitor had an electron gun at the back which
fired electrons on areas which had to be 'lit'. When an electron hits the
screen it glows in the form of a dot. Many such dots can form your lines and
curves.
So if a particular area of the screen were to be left lit for a long time,
the phosphor in the lit area would get sort of 'used up' leaving that area to
appear darker permanently.
In order to "save" these old-day "screens", screensavers were invented,
which wil animate the screen to prevent such darkening.
Modern day screens (such as LCD) do not require such protection. In fact
screensavers have now evolved into a form of fancy for many users.
Shijaz Abdulla
B.Tech(IT), MCSE, MCDBA, CCNA, MCSD
A
Arpan
Thanks, Shijaz, for the explanation but I couldn't exactly follow it! You have said that if a particular area of the screen was to be lit for a long time, the phosphor in the lit area would get used up making that area appear darker. To overcome this, screensavers were introduced....OK....fine till here.....but a screensaver on a monitor means that the different areas of the monitor are still being fired with electrons & this is what "light up" those areas. This is turn means that phosphor on the monitor is still getting used up when a screensaver is working. So this should make the monitor appear darker which is exactly what we don't want! From this, one can conclude that screensavers make the monitor appear darker (as the screensaver uses up more phophor present on the screen monitor) & in the process shortens the life of the monitors! So in what way are screensavers helping to prolong the life of PC monitors?
Thanks once again & thanks to Bob as well,
Regards,
Arpan
Hi,
In the old days, monitors had a screen made of phosphor which emits light
when struck by electrons. The monitor had an electron gun at the back which
fired electrons on areas which had to be 'lit'. When an electron hits the
screen it glows in the form of a dot. Many such dots can form your lines and
curves.
So if a particular area of the screen were to be left lit for a long time,
the phosphor in the lit area would get sort of 'used up' leaving that area to
appear darker permanently.
In order to "save" these old-day "screens", screensavers were invented,
which wil animate the screen to prevent such darkening.
Modern day screens (such as LCD) do not require such protection. In fact
screensavers have now evolved into a form of fancy for many users.
Shijaz Abdulla
B.Tech(IT), MCSE, MCDBA, CCNA, MCSD
Thanks once again & thanks to Bob as well,
Regards,
Arpan
Hi,
In the old days, monitors had a screen made of phosphor which emits light
when struck by electrons. The monitor had an electron gun at the back which
fired electrons on areas which had to be 'lit'. When an electron hits the
screen it glows in the form of a dot. Many such dots can form your lines and
curves.
So if a particular area of the screen were to be left lit for a long time,
the phosphor in the lit area would get sort of 'used up' leaving that area to
appear darker permanently.
In order to "save" these old-day "screens", screensavers were invented,
which wil animate the screen to prevent such darkening.
Modern day screens (such as LCD) do not require such protection. In fact
screensavers have now evolved into a form of fancy for many users.
Shijaz Abdulla
B.Tech(IT), MCSE, MCDBA, CCNA, MCSD
D
Dan Seur
The chemistry of CRT phosphors has improved since the old days, and
they have little or no "memory" resulting from repeated illumination.
In other words, no "burned-in after-images" occur now, as was once
the case. In those days, screensavers would kick in, and since they
move their imagery around, they prevented that "burn-in."
Phosphors don't really wear out or get used up during the lifetime of
a typical CRT these days. That's not a problem.
Screensavers these days are more a matter of privacy, and eye candy.
Having a clock you can read from a distance can be useful, too.
they have little or no "memory" resulting from repeated illumination.
In other words, no "burned-in after-images" occur now, as was once
the case. In those days, screensavers would kick in, and since they
move their imagery around, they prevented that "burn-in."
Phosphors don't really wear out or get used up during the lifetime of
a typical CRT these days. That's not a problem.
Screensavers these days are more a matter of privacy, and eye candy.
Having a clock you can read from a distance can be useful, too.
G
Guest
Arpan,
If we leave only a few dots lit for a long time only that area will get
darkened as compared to the rest of the screen. Screensaver allows uniform
darkening of all areas.
The truth is that all old screens darken over time, screensavers make sure
that all areas get darkened uniformly instead of allowing the electron gun to
concentrate only on a particular area, which usually occurs when the computer
is not being used for long periods of time.
If we leave only a few dots lit for a long time only that area will get
darkened as compared to the rest of the screen. Screensaver allows uniform
darkening of all areas.
The truth is that all old screens darken over time, screensavers make sure
that all areas get darkened uniformly instead of allowing the electron gun to
concentrate only on a particular area, which usually occurs when the computer
is not being used for long periods of time.