I use a little 15" LCD flat screen, my daughter found a case used for hobbies at Hobby Lobby, a local craft store. I just strap it over my shoulder and carry it in during an unload. I make it clear to the venue, if you don't have an audience screen, you better get one. I won't do karaoke without one. I do play video's & other visuals. Mostly during the time i play "Guitaroke".If i can bring my guitar, amp, effects, guitar stand, mic stand and other goodies, least they can do is have an audience TV.
