Do aircraft displays get burn in? (Or more accurately for LCDs, do they get image persistence?) I've never seen one. Are they designed to withstand the effect or they just get replaced very often? But replacing them is very expensive...

LCD's do not burn in.  That was a trait of the CRT with phosphorus screen that occurred when the same area on the screen was constantly illuminated by the electron beam.  LCD's: No electron beams, no phosphorus screen, no heat.  The same amount of light is always present, but you only see what the crystal allows to pass.

LCD's do not burn in.  That was a trait of the CRT with phosphorus screen that occurred when the same area on the screen was constantly illuminated by the electron beam.  LCD's: No electron beams, no phosphorus screen, no heat.  The same amount of light is always present, but you only see what the crystal allows to pass.

 

Early LCD screen could get a faint amount of image persistence, I have seen this on old LCD screens that always showed the same image for very long periods, servers as an example, I had one old screen where you could clearly see a faint outline of the Windows taskbar etc. But you are right generally on modern screens  it is not an issue.

 

 

Early LCD screen could get a faint amount of image persistence

 

I've heard of that but had never had it substantiated, by which of course I mean you have done that for me.  Interesting. Must had something to do with the liquid crystal obtaining a memory of sorts.  It's been a long time since screen savers actually saved screens... I do remember early monochrome CRTs could easily get burned, seen it on plenty of oscilloscopes and a few radar PPIs.

A bigger problem is that over the years displays get really scratched up and foggy because there is allways some smart guy who tries to clean them with unappropriate detergents (spit) or cloth.

 

When the sun hits the LCD at the right angle this is really annoying!

I've heard of that but had never had it substantiated, by which of course I mean you have done that for me.  Interesting. Must had something to do with the liquid crystal obtaining a memory of sorts.  It's been a long time since screen savers actually saved screens... I do remember early monochrome CRTs could easily get burned, seen it on plenty of oscilloscopes and a few radar PPIs.

 

Yeah, the LCD TVs we had at IAD with Independence Air got it BAAAAAAAAAD after years of showing the same gate info screens.

I saw it a few times in the 737. The one I remember best was a former PFD was in the lower DU position. You could see the attitude indicator and where the speed and altitude tapes were quite clearly.

A bigger problem is that over the years displays get really scratched up and foggy because there is allways some smart guy who tries to clean them with unappropriate detergents (spit) or cloth.

 

When the sun hits the LCD at the right angle this is really annoying!

 

My pet hate is anyone touching an LCD screen, especially with fingers. I abhor it. Much like Robert Randazzo, the fingerprints on the NGX screens cause me a great deal of despair in the right light. I want to reach for my approved LCD cleaning fluid and give them a good clean but alas! I can't.. :blink:

 

 

 

Yeah, the LCD TVs we had at IAD with Independence Air got it BAAAAAAAAAD after years of showing the same gate info screens.

 

Its the GUI isn't it? The borders and graphics that don't ever change. I can imagine a gate screen. Recently we switched to a different CCTV monitoring screen and one of my enterprising technicians decided to claim one of the old 40" as his own. Apparently he sat down to watch a movie that night and Quell horreur! a lovely overlay of 4x4 CCTV camera boxes complete with camera numbers.

 

 

I saw it a few times in the 737. The one I remember best was a former PFD was in the lower DU position. You could see the attitude indicator and where the speed and altitude tapes were quite clearly.

 

Makes you wonder why they don't rotate them every so often.

 

Although I would like to think on modern panels this issue has been resolved.

My pet hate is anyone touching an LCD screen, especially with fingers. I abhor it. Much like Robert Randazzo, the fingerprints on the NGX screens cause me a great deal of despair in the right light. I want to reach for my approved LCD cleaning fluid and give them a good clean but alas! I can't.. :blink:

Change the fluid ;-)