To start with all the LCDs are digital. You can have ones with different input though.
Not to complicate things lets say there are 3 main type of LCD you could use in your car. One that connects to your VGA port... They usually expensive but you get CRT like quality. Another type will accept composite input which connects to your TV-Out and usually doesn't have a good quality and generally text is very hard to ready.
And last one is driven by a controller card that plugs in to your PCI or ISA slot, they generally expensive but quality is excelent. Only thing is extending the cable could be a problem.