Is overscan bad for a monitor?

MaximRecoil

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If you use the height and width controls to adjust the image slightly outside the bounds of the screen in order to make it fill the screen completely with no black borders around it, does this cause any harm? I seem to remember reading somewhere that this was harmful, but I can't remember where. I think it was in a monitor or machine manual.

I know that there is "overscan" built into most signals that are sent to TVs, but TVs have a bezel that covers part of the tube (while arcade monitors don't necessarily), so I don't know if there is really overscan going on, or if the image is still within the bounds of the screen, and only appearing to be overscan due to being partially covered by the bezel.
 
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For most arcade monitors, I wouldn't think this would be a problem. The circuits are designed for an approximate range of the expected signal. Now, if you were to apply an improper signal - like a medium resolution signal to a standard resolution chassis - then it can cause damage if ran for too long (and the picture wouldn't display properly....
 
Okay, I remember where I read that now. It was in a manual, but not a manual for arcade machines or monitors. However, when I read it, I wondered if the same thing would apply to arcade monitors, since it was talking about CRTs.

From the BarcoGraphics 808s install manual:

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