Sometimes you find very cheap LCDs for use with an overhead-projector. For us the elder ones in black-and white are more interesting, I think. Those displays have a common VGA-connector (which is analogue), some of them have a composite connector, which would make things much easier. Another possibility wouldbe a pocket-TV (for example the old Casio black and white models.). Exspecially the Casio has no backlite, but a diffusor, it uses sunlight to make the picture visible. This TV is a curiosity by itself, because you view the picture in a mirror, not on the TFT. (Like in a prewar Telefunken TV). You can use that display with very little modification I guess. Now you can get such a TV for about 10 EUR, but I bet that it will become a collector's item in a few years...
Update:
Here are the photos:
The white array is not the display, but the diffusor!
On the upside is the black and white TFT, you see the TV-picture in the mirror. Here is this area are no longer any programmes analogue available, so I left the TV-set switched off.