Unfortunately most of those LCD photo frames don't have any video input at all.
There is a new class of small USB LCD monitors, however. They're still a lot cheaper than a high-quality Xenarc LCD display but you do need special drivers, etc.
If money is no objection I'd say go with a Xenarc. Never tried them, they're expensive, but every time someone mentions their displays it's to say good things about them.
Lilliput, on the other hand... I had a 7" which stopped working after only 4 months.
