27" iMac display question - is this normal for led displays?

instabusto

macrumors member
Original poster
Nov 21, 2009
31
0
This is my first led-backlit display and the first big glossy display I have used. First of all, the display is amazing because of how accurate it is and I love using it. Then to the question:

The display is sort of alive, stick with me i'll try to explain it as best as I can, english is not my native language :p
It kinda makes this very little brightness pumping that old crt tv's and monitors did. Same kind of effect but in a lot smaller effect, but you can sorta notice it's there. I have had none of those display image disappearance/flicker problems at all, display is working very well but I'm wondering if this kind of effect is normal with LED displays and does the glossy display enhance it/let more through? I'm thinking this might add to eye strain in long use but not sure(just like crt's did).

Someone mentioned in another thread something about "pulse width modulation of the LEDs." but my technical knowledge of led monitors is zero so I don't know what that looks like in real life and do not know if this is that. Sorry for the very vague explanation but I dont know how to explain it better. Please chime in :rolleyes:
 

instabusto

macrumors member
Original poster
Nov 21, 2009
31
0
Anyone else noticing the same coming from a matte lcd to a glossy led one?
 
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instabusto

macrumors member
Original poster
Nov 21, 2009
31
0
I had an issue with my 27 iMac... I white line intermittently flashed across the screen.

Had it replaced and is now fine.
I don't have any lines or that on/off flickering, it's more of a "very minor brightness pump" and has something to do with the backlighting but i don't know if it's a fault or character of this display. I have also gotten some eye straing after using this computer for the weekend, the kind of eye strain i never get from my matte screens.

What do you guys think, will apple take it back and give me a refund if I'm just not compatible with the machine? I ordered it from their webstore so there was no way for me to 'test' it before it got here.

I also think one thing I could say is they marketed it wrongly when they said you can use it as an external display, they shouldve also said the actual imac has to be powered and in os x to use it as an external display(isnt this the case?)
 
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frenchie0101

macrumors 6502
Jul 3, 2009
283
6
I don't have any lines or that on/off flickering, it's more of a "very minor brightness pump" and has something to do with the backlighting but i don't know if it's a fault or character of this display. I have also gotten some eye straing after using this computer for the weekend, the kind of eye strain i never get from my matte screens.

What do you guys think, will apple take it back and give me a refund if I'm just not compatible with the machine? I ordered it from their webstore so there was no way for me to 'test' it before it got here.

I also think one thing I could say is they marketed it wrongly when they said you can use it as an external display, they shouldve also said the actual imac has to be powered and in os x to use it as an external display(isnt this the case?)
you can use the 27" as a standalone monitor (i think thats what you trying to ask)
 
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instabusto

macrumors member
Original poster
Nov 21, 2009
31
0
you can use the 27" as a standalone monitor (i think thats what you trying to ask)
Ok just to be clear: you can use the imacs display as a stand alone monitor even if the computer is otherwise shut down?

I was under the assumption from reading other threads here that osx needs to be running for the imac to be able to work as a monitor to other devices.
 
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