General > General Technical Chat
Why do Digital Displays have a Screen saver. When CRT's Don't?
Someone:
CRTs and LCDs do have burn in, and it varies wildly between different panels/drivers. There are a range of mitigation methods used in products that make it less noticeable, or reduce the accumulation. Screen savers are brute force methods when you don't have anything better.
For the high contrast images displayed by test equipment you'll likely never notice the small variations. But in a smooth gradient that same burn in will jump out obviously.
langwadt:
--- Quote from: Someone on June 06, 2020, 10:55:57 pm ---CRTs and LCDs do have burn in, and it varies wildly between different panels/drivers. There are a range of mitigation methods used in products that make it less noticeable, or reduce the accumulation. Screen savers are brute force methods when you don't have anything better.
For the high contrast images displayed by test equipment you'll likely never notice the small variations. But in a smooth gradient that same burn in will jump out obviously.
--- End quote ---
yep, we used som 7" lcds and they were basically scrap after about month of showing the same picture
james_s:
I've seen image retention on LCD panels but usually it fades after a while if you show something else. I've also seen panels that displayed the same image for many years and never showed any kind of retention. There's zero reason to have a screensaver on a LCD scope, although many newer scopes are Windows PCs under the hood so it would not surprise me if the standard Windows screensaver framework can be enabled. I've also heard people refer to the wallpaper or lock screen image on a phone as a screensaver which never made any sense to me, I figured it must be people too young to remember what a screensaver is.
IMO the only time screensavers ever made sense was on all-in-one CRT based computers like the compact Macs. Anything with a separate monitor it has always made sense to just turn off the monitor if you won't be using it for a while. If anything, screensavers encourage people to leave a monitor on unnecessarily. I do have fond memories of watching the flying toasters float by though.
David Hess:
The only LCD panels where I have seen image burn were either high intensity projection displays or defective displays. Projection displays are what I was thinking of when I mentioned exceptions.
NiHaoMike:
--- 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/
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