7:07 AM PT -- TMZ Sports has obtained the mug shot from O'Neal's arrest earlier this month ... and the guy actually SMILED for the pic.
Ex-NFL star Deltha O'Neal broke his back and neck in a horrific car crash in August ... and now, prosecutors have hit the former DB with DUI after they say he was drunk during the fiery wreck.
According to court docs obtained by TMZ Sports, O'Neal and a passenger were on their way home from a Royal Palm Beach, Fl. bar on Aug.