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Why do Digital Displays have a Screen saver. When CRT's Don't?
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Labrat101:

--- Quote from: NiHaoMike on June 07, 2020, 03:57:37 am ---
--- Quote from: james_s on June 06, 2020, 11:25:42 pm ---I do have fond memories of watching the flying toasters float by though.

--- End quote ---
Ported to several modern platforms.
https://www.jwz.org/xscreensaver/


--- End quote ---
Interesting . puts a whole new light on magic smoke.
  This was not quite what I was referring to . . But to screen blanking .screen protection to stop image burn.
 Which seem to be under the title of screen saver. on many system.
 
     After Dark was far better .. ( The man on a desert island )  :-+  Never did do any work just sat and watched it  ..
SiliconWizard:
As said above, just blanking the CRT display would have been an easy way to avoid screen burns.

On old analog scopes which basically had no "fixed" area of the display, the problem would be minor unless the user left the exact same signal on display for a very long time. Probably not that much of a problem in practice.

The problem started to appear when scopes started to have on-screen display of extra information. I guess automatically blanking the screen after a defined amount of time would have solved the issue, but OTOH that could have been pretty annoying for many use cases. Detecting the user is NOT actually using a scope (as opposed to a computer when you can more or less safely assume that if the user doesn't take any action for a while, they're probably not using the computer) is not that trivial. In some cases, you may work with a scope for extended periods of times without touching it, but still looking at it. Guess vendors didn't bother to add this optional feature. And screen burns can be pretexts to buy new gear anyway...

It's not a "digital display" (I guess LCD?) vs CRT matter IMHO, more a matter of history. When LCD displays became the norm on scopes, screen savers were already popular on computers, so that became more obvious. Still, I've used quite a few modern scopes that didn't have any screen saver feature (at least that I've known of.)
Labrat101:
Very True.
I have 2 analog scopes which I prefer over my digital .
Both Have the grid on the screen its self and not on a glass over lay . And both have a visible
Burn marks and I can see the grid even when I turn the display Grid Off.
Yes I always turn the brightness down if I am leaving my bench for any length of time.
Hp Agilent @ & the big old Tektronix which I repaired and re calibrated Both not so long ago.
I did even wonder about putting a small button and relay on the brightness control just to dim the screen to minimum .. Push & Go ..But As every one knows if its working don't fix it. . :-BROKE

Thanks for all the feed back . I thought that this thread would never get any replies .  :scared:
As being a Engineer/Tech My self it was one of those thoughts that I came up with while stuck Looking at My screens and wondering why the savers or Blanker were invented nearly 10 years after they were not really Needed. 
  ...Lock down has a lot to answer for ..  ::)
I See by all the feed back, this has open a whole new portal .
 Its the simple things in life that are so Pleasing
 I would Love to Get "After Dark" Back    :popcorn:

RNS
TimFox:
On IPS computer monitors from -hp-, they do not warranty against burn-in caused by a stationary display.  They specifically warn against the use of those monitors in a security/surveillance application, where the scene does not change for hours at a time.  For that reason, I switched the power settings on my desktop computer to blank the screen after a reasonable dead time.
james_s:
Most of the CRT based DSOs and other instruments I've encountered have some screen burn but I don't think it really matters, it's not something you notice in regular use. Burn is an issue on computer displays and arcade games where the display shows vastly different images at different points in time, I remember seeing a lot of computers with a login screen burned in and arcade games typically have "GAME OVER" and scores and such burned in. A scope though always displays roughly the same thing, a graticule, menu grid, maybe some text. It's rare that large areas of the screen are illuminated which would make the burn visible. 
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