Is it possible to get screen burn on a 68k powerbook lcd if a machine is left on (without backlighting) 24/7? I know this can happen with a crt, but what about an lcd?
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Powerbook 1xx lcd: screen burn?
- Thread starter beachycove
- Start date
Usually they don't burn, but the backlight will obviously die faster (unless it's dimmed), and the display may respond a bit slower than normal if it's changed quickly after a long stint of sameness, but usually return to normal eventually.
However, tunnel vision (where the edges of the display turn dark before the darkness totally envelops the whole screen) is terminal and, so far as I know, incurable. This usually only occurs on the active-matrix models, such the PB 170 (as it did on one of mine), and the 180/180c.
I'm not sure what causes the condition. I'd guess it's a deterioration of the contacts between the display's control board and the contacts on the liquid crystal panel...
However, tunnel vision (where the edges of the display turn dark before the darkness totally envelops the whole screen) is terminal and, so far as I know, incurable. This usually only occurs on the active-matrix models, such the PB 170 (as it did on one of mine), and the 180/180c.
I'm not sure what causes the condition. I'd guess it's a deterioration of the contacts between the display's control board and the contacts on the liquid crystal panel...
I know that the 170 and 180 get "tunnel-vision" (seen it myself), but I don't think it occurs to the 180c as well does it? Mine doesn't have it, and I've never heard of any other 180c's having it.
Oh well, in the event it does happen, I'm glad I have a spare 180c panel.
Oh well, in the event it does happen, I'm glad I have a spare 180c panel.
I was asking more about menu bars etc. permanently marking the screen if left on.
Yes... what he said ^^^.
My Mac Portable was left turned on, displaying basically the same image when it wasn't in use for (literally) a couple of years. After a few months, the black pixels would start to remain black - in other words, I'd drag a window and its outline would remain at the old location. Turning the computer off for a day or so, or displaying an all white image would fix the problem.
Nowadays, the Mac Portable is rarely used, but I can find no sign of long term damage to the display.
My Mac Portable was left turned on, displaying basically the same image when it wasn't in use for (literally) a couple of years. After a few months, the black pixels would start to remain black - in other words, I'd drag a window and its outline would remain at the old location. Turning the computer off for a day or so, or displaying an all white image would fix the problem.
Nowadays, the Mac Portable is rarely used, but I can find no sign of long term damage to the display.
I think it is possible to burn an LCD... but probably a lot harder than on a CRT. Why do you ask? Do you want to burn an LCD display?
I still use my PB 180... I have been writing a blog on my PB that I am planning to publish to the internet... I'm still looking for a way to transfer the files though.
I have a PB160 set up with a FileMaker database for regular but intermittent access, and was wondering if it would harm the machine to leave it on 24/7 (backlighting off and disk spun down as per the usual energy saving settings) rather than let it go to sleep. No, I don't want to burn menu bars and such onto the LCD.... :O
Hmm... My Powerbook 180 is on sleep 24/7, besides when I am actually using it. It doesn't seem to have any problems, but that is because the display is off. I image if you left it on, even with the backlighting off, the screen would eventually burn. Is there any way to put a screen saver on one of the early PB's?
Burn? No. Unlike a CRT, there's no energetic electron beam striking anything. There's no destructive momentum transfer in an LCD, only a gentle change in optical polarization.
What *can* happen, however, is for the liquid crystals to become a bit sticky. If forced to remain in a particular position for an extended period of time, they'll tend to favor it. This stickiness is not great, however, and it is easily overcome. Just leaving the display off for a day or two usually suffices. In the rare stubborn case, displaying an all-white and then perhaps an all-black screen (not by manipulating the backlight state) for a day or so will fix it.
What *can* happen, however, is for the liquid crystals to become a bit sticky. If forced to remain in a particular position for an extended period of time, they'll tend to favor it. This stickiness is not great, however, and it is easily overcome. Just leaving the display off for a day or two usually suffices. In the rare stubborn case, displaying an all-white and then perhaps an all-black screen (not by manipulating the backlight state) for a day or so will fix it.
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