http://www.matrox.com/graphics/en/special/..._lppci_lvds.php

Some information:
Bus interface PCI 32-bit / 33 and 66 MHz
Dimensions Low profile, small footprint PCI card: 5.2"± X 2.536"±
Weight 86g (0.19 pounds)
Frame buffer memory 64 MB
Display support 2x LVDS channels
Maximum number of cards per system Not limited

Resolution (pixels) 1600x1200 @ 60Hz (1920x1200 w/ reduced timings)

Environmental Operating temperature from 0 to 55 degrees Celsius
Storage temperature from -40 to 75 degrees Celsius
Atmospheric Maximum operating altitude up to 3,000 meters
Maximum transport altitude up to 12,000 meters
Humidity Operating humidity from 20% to 80%, non-condensing
Storage humidity from 5 to 95%, non-condensing
OS support
Microsoft® Windows® XP Professional 32-bit, Windows® XP Professional 64-bit, Windows XP Embedded, Linux (inquire about other operating systems)
Part Number A-P65P64DS0004

Product availability, ordering information & support
Product is available from Matrox directly at a quantity 1 list price of $279.00 USD with quantity rebates. Please contact Matrox Applications Engineering group to review your project requirements and for further details.

I believe that there is also an Epia ITX motherbard that has an LVDS controller on the board itself that could be used the same way, but there wasn't really any documentation about it in the manual. Plus the board itself wasn't that great.

Actually, a bunch of the ITX, mini ITX and Pico ITX boards have it on them, but, you do need to add a small daughter card to it that then connects to an LCD panel via an LVDS cable that they do not supply. You are on your own in making it work! And, like you said, there isn't any real info available. You have to dig for it in various forums.
But, you could build a small HTPC into a projector with it.

And I was thinking exactly that when I was looking at the board, but the CPU was directly attached and didn't perform that well...