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

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Labrat101:
Here is The Question.
  That over 50 years in electronics no one has Yet given me a Good Answer .
     Why do Digital displays have a screen savers when CRT's Don't?

 All the CRT's and analog scopes . I have ever used or seen Don't have a screen savers .
 To stop that nasty screen burn. which plagues them All. Also the Plasma &  Phosphor screens suffer from screen burn .  :'(

  I have never seen screen burn on a Digital screen . ie LCD, LED,  But all have a screen saver .. Why.. ?? 

  Yes I know its a silly Question but does any one Know the Real Answer. 
     "To me its like inventing the Gate after the cows have all run out of the field . "

So I would like to hear from all .. WHY. ??    :popcorn: 

RNS

Zero999:
I've never seen a screensaver on any oscilloscope.

There won't be a screensaver on an analogue oscilloscope because it's not something which can easily be implemented using analogue circuitry.

If a modern digital oscilloscope has a screensaver, it will just be for marketing or a novelty.

Siwastaja:
Never seen one either, so the claim that "all" have it is not on a very stable ground.

IIRC, I think I have seen a screensaver on an Agilent digital storage oscillosscope, but that was a CRT.

Analog scopes could implement "screensaver" in a form of turning the thing off automatically after a set time of no setting changes, but people hate such auto-off features. Engineers want a reliable device that doesn't fuck with their work, because their worktime is more valuable than the fact that instruments wear out and must be replaced. Analog scopes require some understanding, you need to be quite stupid to really burn the phosphor. Most people understand not to do it.

0culus:
Tek scopes with an mcp crt (7104, 2467) have a protection circuit that (at least in the 7104) shuts off the crt based on a combination how bright the display is set and timing. The brighter you set it (I think it's actually looking at grid current or something), the faster it shuts off to protect the microchannel plate gain. The HP 53310A modulation domain analyzer (and I assume also o-scopes built in the same form factor, using a raster crt) has a screen saver. It's also important to note that electrostatic deflection analog scope crts are not the same as the raster crts that we know and love from televisions and computer monitors.

Bud:
Shutting off the crt on analog scopes is your screen saver. The fancy dancing stars and stuff on modern digital scope screens is a habit carried over from computers.

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