Looks like the display is actually broken - the cable contains an 8-bit databus, and the data is getting to the display fine as far as I can see. Vertical stripes like that make it look like the internal connections from the LCD driver chip to the LCD are dead.

The display is custom, though. You can't buy them off the shelf :(

You could try taking it apart and applying pressure to various bits of display to see if it helps. Avoid the EL backlight driver though, this is about 1000v!

Hugo