LCD screens - to dim or to switch off?
Thread Starter
Joined: Aug 2002
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From: Switzerland, Singapore
LCD screens - to dim or to switch off?
Most of us have learned through the years that CRT (cathod ray tubes) - conventional screens in cockpits - shouldn't be turned off but dimmed. For enhanced life (or other reasons?).
Now with new aircraft arriving more and more with nice flat LCD screens, what do you do when you leave the flight deck?
Serious opinion and technical facts required.
Thanks guys,
Dani
Now with new aircraft arriving more and more with nice flat LCD screens, what do you do when you leave the flight deck?
Serious opinion and technical facts required.
Thanks guys,
Dani
Last edited by Dani; 6th June 2006 at 07:50.
Joined: Jul 1999
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From: Big Sky Country
CRT's were dimmed to prevent screen burn through. LCD's dont suffer from this problem buts its still good practice to dim the screens. I don't think you'll be able to turn them off, not on a Boeing anyway.
Bottums Up
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From: dunnunda
Dani
I was told the other day that having the LCDs set to about 2/3 brightness as opposed to full brightness, doubles their life. At 2/3 they're quite bright enough to see easily.
I do not know the source of the information.
I was told the other day that having the LCDs set to about 2/3 brightness as opposed to full brightness, doubles their life. At 2/3 they're quite bright enough to see easily.
I do not know the source of the information.
Joined: May 2006
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From: EDI-MCT
As LME said, CRTs were dimmed to prevent screen burn-in. It was not recommended to turn off CRTs as continually switching them on and off stresses the high voltage circuits and could result in premature failure. Better to keep them running. This was true of most applications for CRTs, not just in cockpits.
LCDs are much more reliable and can be left on for as long as you like. I would guess that it is "good practice" to dim them when not used is either to save power by turning the backlight down, or avoiding the distraction of brightly glowing screens in an otherwise dark and empty flight deck.
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cj
-I wish life had a "pause" button
LCDs are much more reliable and can be left on for as long as you like. I would guess that it is "good practice" to dim them when not used is either to save power by turning the backlight down, or avoiding the distraction of brightly glowing screens in an otherwise dark and empty flight deck.
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cj
-I wish life had a "pause" button
Joined: Jan 2000
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From: ???
I believe on the Airbus aircraft there was a sofware issue that caused the displays to go into "self test" mode after a certain amount of hours powered up. This could make all displays useless for 20-30 seconds. This could be the reason that some operators turn the DU's off.
Psychophysiological entity
Joined: Jun 2001
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From: Walton on the Naze Essex.
I'm not sure of the methods used on the flight-deck, but to compare to modern T/Vs, the LCD component takes very little current, but the illuminating bulb is very much a ‘lifed' component.
The bulbs on a 50-60 inch screen used to cost $1,000, but now are around $350. One T/V shop in Essex does not leave the big Sonys on display because of the life of the bulb.
If there is a similarity in the method of displaying LCD information, it would be safe to assume that to under-run the back-light would give it more life.
The bulbs on a 50-60 inch screen used to cost $1,000, but now are around $350. One T/V shop in Essex does not leave the big Sonys on display because of the life of the bulb.
If there is a similarity in the method of displaying LCD information, it would be safe to assume that to under-run the back-light would give it more life.
