I'm trying to figure out the reasoning why a monitor manufacturer, would bother to include the option to mirror the OSD? I was thinking, perhaps if the monitor was mounted in some cabinet that bounces off a mirror, so the image looked correct, however, it only flips the OSD, not the video signal itself.

So with that, I'm not sure why it's there then, why flip the OSD, but not the video signal itself? Seems kind of pointless, but I am sure someone will prove to me why it's there. ;)

I think since the OSD is generated in the monitor, but the content is generated in the source, you are expected to use this with a mirror (as you imagine) and flip the content in the source.

Hmm ok. I'm actually surprised though that with the scaler and video processor contained in the monitor, it couldn't flip the image though also, but I can understand if perhaps the processor in the monitor is only just capable of showing and upscaling an image, but not flipping it entirely on it's own.

Medium-sized monitors may be used in traditional on-camera teleprompter setups, which require a reversed image for a right-reading display thru the angled "mirror" glass. Prompter text itself is reversed before output from the prompter.

The same technique is used for 'people-prompting' in remote-interview situations, so that each participant can maintain direct eye contact with the camera and the other participant during the interview. Used in both broadcast and video conference set-ups. (In this case, image reversing not required because it's a talking head.)

If it's tiny, it may be configured to be used in a heads-up automotive display, with the image reflected via the windshield. (For GPS mapping data, or virtual instrument panel.) Image reversal in each case would be by the host device rather than the display.

Both of these potential uses would occasionally require menu access.

Chip