I guess I'm not alone in wanting to do this?
I've been doing my homework, and apparently this is not
possible, either in any version of Windows OS, or on a single video card (I chatted with a tech from ATI, and he said that simultaneous output of multiple resolutions were not possible).
Now, our IT guy where I work states emphatically that he has run multiple resolutions using PowerStrip, but I've installed the software, and I don't see how that's possible. I think Windows overrides any attempts to force a "duplicate" monitor/desktop output, at different resolutions.
Seems the only real solution is to use a scaler capable of 1080p input, and down-convert the signal for the small LCD display. I hate to invest any more money in this, but it looks to be the only way. THIS
appears to be about the most reasonably priced solution, though it has the most flexibility of most I've looked at.
To address the digital/analog question Davinleeds brought up... The LCD display, even though it has a VGA (15-pin D-sub) connector, does
take a digital signal. I'm currently running it with a simple DVI-to-VGA adapter (with no conversion) right off my video card (I don't know if the card senses an analog device connected, and can switch based on display type attached, but I doubt it). At any rate, the scaler I linked to above, can do either digital or analog output, so it's not a worry.
Boy!! Does the investment in this hobby ever end???
(That's a rhetorical question, BTW...
On edit: There's one other device I've been looking at: THIS.
But, in looking at the specs, I don't see whether or not it has enough bandwidth to accept a 1080p input signal. If it did, this would be an ideal piece, as I'd strip it down and actually fit it into my PC case (so there's no extra peripheral device or cabling).