Arriving for the screening of U23D in Dublin, Bono also said the supergroup’s long-awaited new album will be “very radical”.
Bono has featured in many award-winning U2 music videos during his career and also starred in the 1998 concert movie, Rattle And Hum.
But he said he was too busy being a singer, songwriter and a political activist to consider becoming an actor as well.
“I know Mick Jagger played the outlaw Ned Kelly. I’m in a band. I’m doing enough extra curricular activity to keep me going,” he joked.
Hundreds of fans turned up to Parnell Street’s Cineworld in the Irish capital for the film, which received its world premiere at the Sundance Festival in Utah last month.
Bono, accompanied by his wife Ali Hewson and flanked by band members The Edge, Adam Clayton and Larry Mullen Jnr, also said U2’s new album will be “uncompromising”.
“Who needs another U2 album unless it’s a really great piece of rock ‘n’ roll? We have to do something really extraordinary to be able to get out of bed these days.”
U23D is based on the band’s Vertigo Tour concert in South America.
Directed by a friend of the band, Catherine Owens, it uses the latest 3D technology to portray the passionate reactions of 80,000 fans at a Buenos Aires concert.
Bono said: “Somebody else had to do the hard work. We were just there. We’ve always tried to do something new with our live shows. We were the first to build our stages out into the crowd — we’re always pushing innovation.
“If they thought our heads were big,” he joked, “wait until U23D gets to the IMAX Theatre.”
“What this is, is the beginning of something. It’s a little piece of cinematic history and everybody says it’s the best thing they’ve ever seen.
“I’m not sure. We’re just doing our thing.”
U23D is being screened in Dublin as part of the Jameson International Film Festival.